bump package version to 1.2.0 (#81)

Signed-off-by: Brian DeHamer <bdehamer@github.com>

README.md

@@ -65,7 +65,7 @@ See [action.yml](action.yml)
   with:
     # Path to the artifact serving as the subject of the attestation. Must
     # specify exactly one of "subject-path" or "subject-digest". May contain
-    # a glob pattern or list of paths (total subject count cannot exceed 64).
+    # a glob pattern or list of paths (total subject count cannot exceed 2500).
     subject-path:
 
     # SHA256 digest of the subject for the attestation. Must be in the form
@@ -81,12 +81,14 @@ See [action.yml](action.yml)
     # URI identifying the type of the predicate.
     predicate-type:
 
-    # JSON string containing the value for the attestation predicate. Must
-    # supply exactly one of "predicate-path" or "predicate".
+    # String containing the value for the attestation predicate. String length
+    # cannot exceed 16MB. Must supply exactly one of "predicate-path" or
+    # "predicate".
     predicate:
 
-    # Path to the file which contains the JSON content for the attestation
-    # predicate. Must supply exactly one of "predicate-path" or "predicate".
+    # Path to the file which contains the content for the attestation predicate.
+    # File size cannot exceed 16MB. Must supply exactly one of "predicate-path"
+    # or "predicate".
     predicate-path:
 
     # Whether to push the attestation to the image registry. Requires that the
@@ -115,6 +117,20 @@ If multiple subjects are being attested at the same time, each attestation will
 be written to the output file on a separate line (using the [JSON Lines][7]
 format).
 
+## Attestation Limits
+
+### Subject Limits
+
+No more than 2500 subjects can be attested at the same time. Subjects will be
+processed in batches 50. After the initial group of 50, each subsequent batch
+will incur an exponentially increasing amount of delay (capped at 1 minute of
+delay per batch) to avoid overwhelming the attestation API.
+
+### Predicate Limits
+
+Whether supplied via the `predicate` or `predicatePath` input, the predicate
+string cannot exceed 16MB.
+
 ## Examples
 
 ### Identify Subject by Path
@@ -175,8 +191,8 @@ fully-qualified image name (e.g. "ghcr.io/user/app" or
 "acme.azurecr.io/user/app"). Do NOT include a tag as part of the image name --
 the specific image being attested is identified by the supplied digest.
 
-> **NOTE**: When pushing to Docker Hub, please use "docker.io" as the
-> registry portion of the image name.
+> **NOTE**: When pushing to Docker Hub, please use "docker.io" as the registry
+> portion of the image name.
 
 ```yaml
 name: build-attested-image

__tests__/index.test.ts

@@ -2,12 +2,17 @@
  * Unit tests for the action's entrypoint, src/index.ts
  */
 
+import * as core from '@actions/core'
 import * as main from '../src/main'
 
 // Mock the action's entrypoint
 const runMock = jest.spyOn(main, 'run').mockImplementation()
+const getBooleanInputMock = jest.spyOn(core, 'getBooleanInput')
 
 describe('index', () => {
+  beforeEach(() => {
+    getBooleanInputMock.mockImplementation(() => false)
+  })
   it('calls run when imported', async () => {
     // eslint-disable-next-line @typescript-eslint/no-require-imports
     require('../src/index')

__tests__/main.test.ts

@@ -20,8 +20,6 @@ import * as main from '../src/main'
 // Mock the GitHub Actions core library
 const infoMock = jest.spyOn(core, 'info')
 const startGroupMock = jest.spyOn(core, 'startGroup')
-const getInputMock = jest.spyOn(core, 'getInput')
-const getBooleanInputMock = jest.spyOn(core, 'getBooleanInput')
 const setOutputMock = jest.spyOn(core, 'setOutput')
 const setFailedMock = jest.spyOn(core, 'setFailed')
 
@@ -38,12 +36,28 @@ const runMock = jest.spyOn(main, 'run')
 const mockAgent = new MockAgent()
 setGlobalDispatcher(mockAgent)
 
+const defaultInputs: main.RunInputs = {
+  predicate: '',
+  predicateType: '',
+  predicatePath: '',
+  subjectName: '',
+  subjectDigest: '',
+  subjectPath: '',
+  pushToRegistry: false,
+  githubToken: '',
+  privateSigning: false,
+  batchSize: 50
+}
+
 describe('action', () => {
   // Capture original environment variables and GitHub context so we can restore
   // them after each test
   const originalEnv = process.env
   const originalContext = { ...github.context }
 
+  // Mock OIDC token endpoint
+  const tokenURL = 'https://token.url'
+
   // Fake an OIDC token
   const oidcSubject = 'foo@bar.com'
   const oidcPayload = { sub: oidcSubject, iss: '' }
@@ -62,9 +76,6 @@ describe('action', () => {
   beforeEach(() => {
     jest.clearAllMocks()
 
-    // Mock OIDC token endpoint
-    const tokenURL = 'https://token.url'
-
     nock(tokenURL)
       .get('/')
       .query({ audience: 'sigstore' })
@@ -95,24 +106,22 @@ describe('action', () => {
   })
 
   describe('when ACTIONS_ID_TOKEN_REQUEST_URL is not set', () => {
-    const inputs = {
-      'subject-digest': subjectDigest,
-      'subject-name': subjectName,
-      'predicate-type': predicateType,
+    const inputs: main.RunInputs = {
+      ...defaultInputs,
+      subjectDigest,
+      subjectName,
+      predicateType,
       predicate,
-      'github-token': 'gh-token'
+      githubToken: 'gh-token'
     }
 
     beforeEach(() => {
       // Nullify the OIDC token URL
       process.env.ACTIONS_ID_TOKEN_REQUEST_URL = ''
-
-      getInputMock.mockImplementation(mockInput(inputs))
-      getBooleanInputMock.mockImplementation(() => false)
     })
 
     it('sets a failed status', async () => {
-      await main.run()
+      await main.run(inputs)
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).toHaveBeenCalledWith(
@@ -124,12 +133,8 @@ describe('action', () => {
   })
 
   describe('when no inputs are provided', () => {
-    beforeEach(() => {
-      getInputMock.mockImplementation(() => '')
-    })
-
     it('sets a failed status', async () => {
-      await main.run()
+      await main.run(defaultInputs)
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).toHaveBeenCalledWith(
@@ -139,12 +144,13 @@ describe('action', () => {
   })
 
   describe('when the repository is private', () => {
-    const inputs = {
-      'subject-digest': subjectDigest,
-      'subject-name': subjectName,
-      'predicate-type': predicateType,
+    const inputs: main.RunInputs = {
+      ...defaultInputs,
+      subjectDigest,
+      subjectName,
+      predicateType,
       predicate,
-      'github-token': 'gh-token'
+      githubToken: 'gh-token'
     }
 
     beforeEach(async () => {
@@ -154,9 +160,6 @@ describe('action', () => {
         repo: { owner: 'foo', repo: 'bar' }
       })
 
-      getInputMock.mockImplementation(mockInput(inputs))
-      getBooleanInputMock.mockImplementation(() => false)
-
       await mockFulcio({
         baseURL: 'https://fulcio.githubapp.com',
         strict: false
@@ -165,7 +168,7 @@ describe('action', () => {
     })
 
     it('invokes the action w/o error', async () => {
-      await main.run()
+      await main.run(inputs)
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).not.toHaveBeenCalledWith()
@@ -204,12 +207,14 @@ describe('action', () => {
     const getRegCredsSpy = jest.spyOn(oci, 'getRegistryCredentials')
     const attachArtifactSpy = jest.spyOn(oci, 'attachArtifactToImage')
 
-    const inputs = {
-      'subject-digest': subjectDigest,
-      'subject-name': subjectName,
-      'predicate-type': predicateType,
+    const inputs: main.RunInputs = {
+      ...defaultInputs,
+      subjectDigest,
+      subjectName,
+      predicateType,
       predicate,
-      'github-token': 'gh-token'
+      githubToken: 'gh-token',
+      pushToRegistry: true
     }
 
     beforeEach(async () => {
@@ -219,11 +224,6 @@ describe('action', () => {
         repo: { owner: 'foo', repo: 'bar' }
       })
 
-      // Mock the action's inputs
-      getInputMock.mockImplementation(mockInput(inputs))
-      // This is where we mock the push-to-registry input
-      getBooleanInputMock.mockImplementation(() => true)
-
       await mockFulcio({
         baseURL: 'https://fulcio.sigstore.dev',
         strict: false
@@ -244,7 +244,7 @@ describe('action', () => {
     })
 
     it('invokes the action w/o error', async () => {
-      await main.run()
+      await main.run(inputs)
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).not.toHaveBeenCalled()
@@ -289,11 +289,16 @@ describe('action', () => {
     })
   })
 
-  describe('when too many subjects are specified', () => {
+  describe('when the subject count exceeds the batch size', () => {
     let dir = ''
+    const filename = 'subject'
+    let scope: nock.Scope
 
     beforeEach(async () => {
-      const filename = 'subject'
+      // Start from scratch
+      nock.cleanAll()
+
+      const subjectCount = 5
       const content = 'file content'
 
       // Set-up temp directory
@@ -301,7 +306,90 @@ describe('action', () => {
       dir = await fs.mkdtemp(tmpDir + path.sep)
 
       // Add files for glob testing
-      for (let i = 0; i < 65; i++) {
+      for (let i = 0; i < subjectCount; i++) {
+        await fs.writeFile(path.join(dir, `${filename}-${i}`), content)
+
+        // Set-up a Fulcio mock for each subject
+        await mockFulcio({
+          baseURL: 'https://fulcio.githubapp.com',
+          strict: false
+        })
+
+        // Set-up a TSA mock for each subject
+        await mockTSA({ baseURL: 'https://timestamp.githubapp.com' })
+
+        // Set-up a GH API mock for each subject
+        mockAgent
+          .get('https://api.github.com')
+          .intercept({
+            path: /^\/repos\/.*\/.*\/attestations$/,
+            method: 'post'
+          })
+          .reply(201, { id: attestationID })
+      }
+
+      // Set-up a OIDC token mock for each subject
+      scope = nock(tokenURL)
+        .get('/')
+        .query({ audience: 'sigstore' })
+        .times(subjectCount)
+        .reply(200, { value: oidcToken })
+
+      // Set the GH context with private repository visibility and a repo owner.
+      setGHContext({
+        payload: { repository: { visibility: 'private' } },
+        repo: { owner: 'foo', repo: 'bar' }
+      })
+    })
+
+    afterEach(async () => {
+      // Clean-up temp directory
+      await fs.rm(dir, { recursive: true })
+    })
+
+    it('invokes the action w/o error', async () => {
+      const inputs: main.RunInputs = {
+        ...defaultInputs,
+        subjectPath: path.join(dir, `${filename}-*`),
+        predicateType,
+        predicate,
+        githubToken: 'gh-token',
+        batchSize: 2
+      }
+      await main.run(inputs)
+
+      expect(runMock).toHaveReturned()
+      expect(setFailedMock).not.toHaveBeenCalled()
+      expect(infoMock).toHaveBeenNthCalledWith(
+        1,
+        expect.stringMatching('Processing subject batch 1/3')
+      )
+      expect(infoMock).toHaveBeenNthCalledWith(
+        10,
+        expect.stringMatching('Processing subject batch 2/3')
+      )
+      expect(infoMock).toHaveBeenNthCalledWith(
+        19,
+        expect.stringMatching('Processing subject batch 3/3')
+      )
+      expect(scope.isDone()).toBe(true)
+    })
+  })
+
+  describe('when the subject count exceeds the max', () => {
+    let dir = ''
+    const filename = 'subject'
+
+    beforeEach(async () => {
+      const subjectCount = 2501
+      const content = 'file content'
+
+      // Set-up temp directory
+      const tmpDir = await fs.realpath(os.tmpdir())
+      dir = await fs.mkdtemp(tmpDir + path.sep)
+
+      // Add files for glob testing
+      for (let i = 0; i < subjectCount; i++) {
         await fs.writeFile(path.join(dir, `${filename}-${i}`), content)
       }
 
@@ -310,14 +398,6 @@ describe('action', () => {
         payload: { repository: { visibility: 'private' } },
         repo: { owner: 'foo', repo: 'bar' }
       })
-
-      // Mock the action's inputs
-      getInputMock.mockImplementation(
-        mockInput({
-          predicate: '{}',
-          'subject-path': path.join(dir, `${filename}-*`)
-        })
-      )
     })
 
     afterEach(async () => {
@@ -326,27 +406,25 @@ describe('action', () => {
     })
 
     it('sets a failed status', async () => {
-      await main.run()
+      const inputs: main.RunInputs = {
+        ...defaultInputs,
+        subjectPath: path.join(dir, `${filename}-*`),
+        predicateType,
+        predicate,
+        githubToken: 'gh-token'
+      }
+      await main.run(inputs)
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).toHaveBeenCalledWith(
         new Error(
-          'Too many subjects specified. The maximum number of subjects is 64.'
+          'Too many subjects specified. The maximum number of subjects is 2500.'
         )
       )
     })
   })
 })
 
-function mockInput(inputs: Record<string, string>): typeof core.getInput {
-  return (name: string): string => {
-    if (name in inputs) {
-      return inputs[name]
-    }
-    return ''
-  }
-}
-
 // Stubbing the GitHub context is a bit tricky. We need to use
 // `Object.defineProperty` because `github.context` is read-only.
 function setGHContext(context: object): void {

__tests__/predicate.test.ts

@@ -1,92 +1,129 @@
 import fs from 'fs/promises'
 import os from 'os'
 import path from 'path'
-import { predicateFromInputs } from '../src/predicate'
+import { predicateFromInputs, PredicateInputs } from '../src/predicate'
 
 describe('subjectFromInputs', () => {
-  afterEach(() => {
-    process.env['INPUT_PREDICATE'] = ''
-    process.env['INPUT_PREDICATE-PATH'] = ''
-    process.env['INPUT_PREDICATE-TYPE'] = ''
-  })
+  const blankInputs: PredicateInputs = {
+    predicateType: '',
+    predicate: '',
+    predicatePath: ''
+  }
 
   describe('when no inputs are provided', () => {
     it('throws an error', () => {
-      expect(() => predicateFromInputs()).toThrow(/predicate-type/i)
+      expect(() => predicateFromInputs(blankInputs)).toThrow(/predicate-type/i)
     })
   })
 
   describe('when neither predicate path nor predicate are provided', () => {
-    beforeEach(() => {
-      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
-    })
-
     it('throws an error', () => {
-      expect(() => predicateFromInputs()).toThrow(
+      const inputs: PredicateInputs = {
+        ...blankInputs,
+        predicateType: 'https://example.com/predicate'
+      }
+
+      expect(() => predicateFromInputs(inputs)).toThrow(
         /one of predicate-path or predicate must be provided/i
       )
     })
   })
 
   describe('when both predicate path and predicate are provided', () => {
-    beforeEach(() => {
-      process.env['INPUT_PREDICATE-PATH'] = 'path/to/predicate'
-      process.env['INPUT_PREDICATE'] = '{}'
-      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
-    })
-
     it('throws an error', () => {
-      expect(() => predicateFromInputs()).toThrow(
+      const inputs: PredicateInputs = {
+        predicateType: 'https://example.com/predicate',
+        predicate: '{}',
+        predicatePath: 'path/to/predicate'
+      }
+
+      expect(() => predicateFromInputs(inputs)).toThrow(
         /only one of predicate-path or predicate may be provided/i
       )
     })
   })
 
   describe('when specifying a predicate path', () => {
-    let dir = ''
-    const filename = 'subject'
+    const predicateType = 'https://example.com/predicate'
     const content = '{}'
+    let predicatePath = ''
 
     beforeEach(async () => {
       // Set-up temp directory
       const tmpDir = await fs.realpath(os.tmpdir())
-      dir = await fs.mkdtemp(tmpDir + path.sep)
+      const dir = await fs.mkdtemp(tmpDir + path.sep)
+
+      const filename = 'subject'
+      predicatePath = path.join(dir, filename)
 
       // Write file to temp directory
-      await fs.writeFile(path.join(dir, filename), content)
+      await fs.writeFile(predicatePath, content)
     })
 
     afterEach(async () => {
       // Clean-up temp directory
-      await fs.rm(dir, { recursive: true })
-    })
-
-    beforeEach(() => {
-      process.env['INPUT_PREDICATE-PATH'] = path.join(dir, filename)
-      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
+      await fs.rm(path.parse(predicatePath).dir, { recursive: true })
     })
 
     it('returns the predicate', () => {
-      expect(predicateFromInputs()).toEqual({
-        type: 'https://example.com/predicate',
-        params: {}
+      const inputs: PredicateInputs = {
+        ...blankInputs,
+        predicateType,
+        predicatePath
+      }
+      expect(predicateFromInputs(inputs)).toEqual({
+        type: predicateType,
+        params: JSON.parse(content)
       })
     })
   })
 
+  describe('when specifying a predicate path that does not exist', () => {
+    const predicateType = 'https://example.com/predicate'
+    const predicatePath = 'foo'
+
+    it('returns the predicate', () => {
+      const inputs: PredicateInputs = {
+        ...blankInputs,
+        predicateType,
+        predicatePath
+      }
+      expect(() => predicateFromInputs(inputs)).toThrow(/file not found/)
+    })
+  })
+
   describe('when specifying a predicate value', () => {
+    const predicateType = 'https://example.com/predicate'
     const content = '{}'
 
-    beforeEach(() => {
-      process.env['INPUT_PREDICATE'] = content
-      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
-    })
-
     it('returns the predicate', () => {
-      expect(predicateFromInputs()).toEqual({
-        type: 'https://example.com/predicate',
-        params: {}
+      const inputs: PredicateInputs = {
+        ...blankInputs,
+        predicateType,
+        predicate: content
+      }
+
+      expect(predicateFromInputs(inputs)).toEqual({
+        type: predicateType,
+        params: JSON.parse(content)
       })
     })
   })
+
+  describe('when specifying a predicate value exceeding the max size', () => {
+    const predicateType = 'https://example.com/predicate'
+    const content = JSON.stringify({ a: 'a'.repeat(16 * 1024 * 1024) })
+
+    it('throws an error', () => {
+      const inputs: PredicateInputs = {
+        ...blankInputs,
+        predicateType,
+        predicate: content
+      }
+
+      expect(() => predicateFromInputs(inputs)).toThrow(
+        /predicate string exceeds maximum/
+      )
+    })
+  })
 })

__tests__/style.test.ts

@@ -0,0 +1,15 @@
+import { highlight, mute } from '../src/style'
+
+describe('style', () => {
+  describe('highlight', () => {
+    it('adds cyan color to the string', () => {
+      expect(highlight('foo')).toBe('\x1B[36mfoo\x1B[39m')
+    })
+  })
+
+  describe('mute', () => {
+    it('adds gray color to the string', () => {
+      expect(mute('foo')).toBe('\x1B[38;5;244mfoo\x1B[39m')
+    })
+  })
+})

__tests__/subject.test.ts

@@ -2,47 +2,45 @@ import crypto from 'crypto'
 import fs from 'fs/promises'
 import os from 'os'
 import path from 'path'
-import { subjectFromInputs } from '../src/subject'
+import { subjectFromInputs, SubjectInputs } from '../src/subject'
 
 describe('subjectFromInputs', () => {
-  beforeEach(() => {
-    process.env['INPUT_PUSH-TO-REGISTRY'] = 'false'
-  })
-
-  afterEach(() => {
-    process.env['INPUT_SUBJECT-PATH'] = ''
-    process.env['INPUT_SUBJECT-DIGEST'] = ''
-    process.env['INPUT_SUBJECT-NAME'] = ''
-  })
+  const blankInputs: SubjectInputs = {
+    subjectPath: '',
+    subjectName: '',
+    subjectDigest: ''
+  }
 
   describe('when no inputs are provided', () => {
     it('throws an error', async () => {
-      await expect(subjectFromInputs()).rejects.toThrow(
+      await expect(subjectFromInputs(blankInputs)).rejects.toThrow(
         /one of subject-path or subject-digest must be provided/i
       )
     })
   })
 
   describe('when both subject path and subject digest are provided', () => {
-    beforeEach(() => {
-      process.env['INPUT_SUBJECT-PATH'] = 'path/to/subject'
-      process.env['INPUT_SUBJECT-DIGEST'] = 'digest'
-    })
-
     it('throws an error', async () => {
-      await expect(subjectFromInputs()).rejects.toThrow(
+      const inputs: SubjectInputs = {
+        subjectName: 'foo',
+        subjectPath: 'path/to/subject',
+        subjectDigest: 'digest'
+      }
+
+      await expect(subjectFromInputs(inputs)).rejects.toThrow(
         /only one of subject-path or subject-digest may be provided/i
       )
     })
   })
 
   describe('when subject digest is provided but not the name', () => {
-    beforeEach(() => {
-      process.env['INPUT_SUBJECT-DIGEST'] = 'digest'
-    })
-
     it('throws an error', async () => {
-      await expect(subjectFromInputs()).rejects.toThrow(
+      const inputs: SubjectInputs = {
+        ...blankInputs,
+        subjectDigest: 'digest'
+      }
+
+      await expect(subjectFromInputs(inputs)).rejects.toThrow(
         /subject-name must be provided when using subject-digest/i
       )
     })
@@ -52,39 +50,42 @@ describe('subjectFromInputs', () => {
     const name = 'Subject'
 
     describe('when the digest is malformed', () => {
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-DIGEST'] = 'digest'
-        process.env['INPUT_SUBJECT-NAME'] = name
-      })
-
       it('throws an error', async () => {
-        await expect(subjectFromInputs()).rejects.toThrow(
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectDigest: 'digest',
+          subjectName: name
+        }
+
+        await expect(subjectFromInputs(inputs)).rejects.toThrow(
           /subject-digest must be in the format "sha256:<hex-digest>"/i
         )
       })
     })
 
     describe('when the alogrithm is not supported', () => {
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-DIGEST'] = 'md5:deadbeef'
-        process.env['INPUT_SUBJECT-NAME'] = name
-      })
-
       it('throws an error', async () => {
-        await expect(subjectFromInputs()).rejects.toThrow(
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectDigest: 'md5:deadbeef',
+          subjectName: name
+        }
+
+        await expect(subjectFromInputs(inputs)).rejects.toThrow(
           /subject-digest must be in the format "sha256:<hex-digest>"/i
         )
       })
     })
 
     describe('when the sha256 digest is malformed', () => {
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-DIGEST'] = 'sha256:deadbeef'
-        process.env['INPUT_SUBJECT-NAME'] = name
-      })
-
       it('throws an error', async () => {
-        await expect(subjectFromInputs()).rejects.toThrow(
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectDigest: 'sha256:deadbeef',
+          subjectName: name
+        }
+
+        await expect(subjectFromInputs(inputs)).rejects.toThrow(
           /subject-digest must be in the format "sha256:<hex-digest>"/i
         )
       })
@@ -95,13 +96,14 @@ describe('subjectFromInputs', () => {
       const digest =
         '7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32'
 
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-DIGEST'] = `${alg}:${digest}`
-        process.env['INPUT_SUBJECT-NAME'] = name
-      })
-
       it('returns the subject', async () => {
-        const subject = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectDigest: `${alg}:${digest}`,
+          subjectName: name
+        }
+
+        const subject = await subjectFromInputs(inputs)
 
         expect(subject).toBeDefined()
         expect(subject).toHaveLength(1)
@@ -110,20 +112,21 @@ describe('subjectFromInputs', () => {
       })
     })
 
-    describe('when the push-to-registry is true', () => {
+    describe('when the downcaseName is true', () => {
       const imageName = 'ghcr.io/FOO/bar'
       const alg = 'sha256'
       const digest =
         '7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32'
 
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-DIGEST'] = `${alg}:${digest}`
-        process.env['INPUT_SUBJECT-NAME'] = imageName
-        process.env['INPUT_PUSH-TO-REGISTRY'] = 'true'
-      })
-
       it('returns the subject (with name downcased)', async () => {
-        const subject = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectDigest: `${alg}:${digest}`,
+          subjectName: imageName,
+          downcaseName: true
+        }
+
+        const subject = await subjectFromInputs(inputs)
 
         expect(subject).toBeDefined()
         expect(subject).toHaveLength(1)
@@ -135,19 +138,20 @@ describe('subjectFromInputs', () => {
 
   describe('when specifying a subject path', () => {
     describe('when the file does NOT exist', () => {
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-PATH'] = '/f/a/k/e'
-      })
-
       it('throws an error', async () => {
-        await expect(subjectFromInputs()).rejects.toThrow(
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: '/f/a/k/e'
+        }
+
+        await expect(subjectFromInputs(inputs)).rejects.toThrow(
           /could not find subject at path/i
         )
       })
     })
   })
 
-  describe('when the file eixts', () => {
+  describe('when the file exists', () => {
     let dir = ''
     const filename = 'subject'
     const content = 'file content'
@@ -178,12 +182,13 @@ describe('subjectFromInputs', () => {
     })
 
     describe('when no name is provided', () => {
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-PATH'] = path.join(dir, filename)
-      })
-
       it('returns the subject', async () => {
-        const subject = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: path.join(dir, filename)
+        }
+
+        const subject = await subjectFromInputs(inputs)
 
         expect(subject).toBeDefined()
         expect(subject).toHaveLength(1)
@@ -195,13 +200,14 @@ describe('subjectFromInputs', () => {
     describe('when a name is provided', () => {
       const name = 'mysubject'
 
-      beforeEach(() => {
-        process.env['INPUT_SUBJECT-PATH'] = path.join(dir, filename)
-        process.env['INPUT_SUBJECT-NAME'] = name
-      })
-
       it('returns the subject', async () => {
-        const subject = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: path.join(dir, filename),
+          subjectName: name
+        }
+
+        const subject = await subjectFromInputs(inputs)
 
         expect(subject).toBeDefined()
         expect(subject).toHaveLength(1)
@@ -211,12 +217,13 @@ describe('subjectFromInputs', () => {
     })
 
     describe('when a file glob is supplied', () => {
-      beforeEach(async () => {
-        process.env['INPUT_SUBJECT-PATH'] = path.join(dir, 'subject-*')
-      })
-
       it('returns the multiple subjects', async () => {
-        const subjects = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: path.join(dir, 'subject-*')
+        }
+
+        const subjects = await subjectFromInputs(inputs)
 
         expect(subjects).toBeDefined()
         expect(subjects).toHaveLength(3)
@@ -230,12 +237,13 @@ describe('subjectFromInputs', () => {
     })
 
     describe('when a file glob is supplied which also matches non-files', () => {
-      beforeEach(async () => {
-        process.env['INPUT_SUBJECT-PATH'] = `${dir}*`
-      })
-
       it('returns the subjects (excluding non-files)', async () => {
-        const subjects = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: `${dir}*`
+        }
+
+        const subjects = await subjectFromInputs(inputs)
 
         expect(subjects).toBeDefined()
         expect(subjects).toHaveLength(7)
@@ -243,13 +251,13 @@ describe('subjectFromInputs', () => {
     })
 
     describe('when a comma-separated list is supplied', () => {
-      beforeEach(async () => {
-        process.env['INPUT_SUBJECT-PATH'] =
-          `${path.join(dir, 'subject-1')},${path.join(dir, 'subject-2')}`
-      })
-
       it('returns the multiple subjects', async () => {
-        const subjects = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: `${path.join(dir, 'subject-1')},${path.join(dir, 'subject-2')}`
+        }
+
+        const subjects = await subjectFromInputs(inputs)
 
         expect(subjects).toBeDefined()
         expect(subjects).toHaveLength(2)
@@ -266,13 +274,13 @@ describe('subjectFromInputs', () => {
     })
 
     describe('when a multi-line list is supplied', () => {
-      beforeEach(async () => {
-        process.env['INPUT_SUBJECT-PATH'] =
-          `${path.join(dir, 'subject-0')}\n${path.join(dir, 'subject-2')}`
-      })
-
       it('returns the multiple subjects', async () => {
-        const subjects = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: `${path.join(dir, 'subject-0')}\n${path.join(dir, 'subject-2')}`
+        }
+
+        const subjects = await subjectFromInputs(inputs)
 
         expect(subjects).toBeDefined()
         expect(subjects).toHaveLength(2)
@@ -289,13 +297,13 @@ describe('subjectFromInputs', () => {
     })
 
     describe('when a multi-line glob list is supplied', () => {
-      beforeEach(async () => {
-        process.env['INPUT_SUBJECT-PATH'] =
-          `${path.join(dir, 'subject-*')}\n  ${path.join(dir, 'other-*')} `
-      })
-
       it('returns the multiple subjects', async () => {
-        const subjects = await subjectFromInputs()
+        const inputs: SubjectInputs = {
+          ...blankInputs,
+          subjectPath: `${path.join(dir, 'subject-*')}\n  ${path.join(dir, 'other-*')} `
+        }
+
+        const subjects = await subjectFromInputs(inputs)
 
         expect(subjects).toBeDefined()
         expect(subjects).toHaveLength(6)

action.yml

@@ -10,7 +10,7 @@ inputs:
     description: >
       Path to the artifact serving as the subject of the attestation. Must
       specify exactly one of "subject-path" or "subject-digest". May contain a
-      glob pattern or list of paths (total subject count cannot exceed 64).
+      glob pattern or list of paths (total subject count cannot exceed 2500).
     required: false
   subject-digest:
     description: >
@@ -30,13 +30,15 @@ inputs:
     required: true
   predicate:
     description: >
-      String containing the value for the attestation predicate. Must supply
-      exactly one of "predicate-path" or "predicate".
+      String containing the value for the attestation predicate. String length
+      cannot exceed 16MB. Must supply exactly one of "predicate-path" or
+      "predicate".
     required: false
   predicate-path:
     description: >
       Path to the file which contains the content for the attestation predicate.
-      Must supply exactly one of "predicate-path" or "predicate".
+      File size cannot exceed 16MB. Must supply exactly one of "predicate-path"
+      or "predicate".
     required: false
   push-to-registry:
     description: >

dist/index.js

@@ -11814,7 +11814,7 @@ async function _OCIImage_createReferrersIndexByTag(opts) {
     if (!referrerManifest.manifests.some((manifest) => manifest.digest === opts.artifact.digest)) {
         // Add the artifact to the index
         referrerManifest.manifests.push(opts.artifact);
-        __classPrivateFieldGet(this, _OCIImage_client, "f").uploadManifest(JSON.stringify(referrerManifest), {
+        await __classPrivateFieldGet(this, _OCIImage_client, "f").uploadManifest(JSON.stringify(referrerManifest), {
             mediaType: constants_1.CONTENT_TYPE_OCI_INDEX,
             reference: referrerTag,
             etag,
@@ -13199,7 +13199,7 @@ exports.ClientTrustConfig = exports.SigningConfig = exports.TrustedRoot = export
 /* eslint-disable */
 const sigstore_common_1 = __nccwpck_require__(82193);
 function createBaseTransparencyLogInstance() {
-    return { baseUrl: "", hashAlgorithm: 0, publicKey: undefined, logId: undefined };
+    return { baseUrl: "", hashAlgorithm: 0, publicKey: undefined, logId: undefined, checkpointKeyId: undefined };
 }
 exports.TransparencyLogInstance = {
     fromJSON(object) {
@@ -13208,6 +13208,7 @@ exports.TransparencyLogInstance = {
             hashAlgorithm: isSet(object.hashAlgorithm) ? (0, sigstore_common_1.hashAlgorithmFromJSON)(object.hashAlgorithm) : 0,
             publicKey: isSet(object.publicKey) ? sigstore_common_1.PublicKey.fromJSON(object.publicKey) : undefined,
             logId: isSet(object.logId) ? sigstore_common_1.LogId.fromJSON(object.logId) : undefined,
+            checkpointKeyId: isSet(object.checkpointKeyId) ? sigstore_common_1.LogId.fromJSON(object.checkpointKeyId) : undefined,
         };
     },
     toJSON(message) {
@@ -13217,6 +13218,8 @@ exports.TransparencyLogInstance = {
         message.publicKey !== undefined &&
             (obj.publicKey = message.publicKey ? sigstore_common_1.PublicKey.toJSON(message.publicKey) : undefined);
         message.logId !== undefined && (obj.logId = message.logId ? sigstore_common_1.LogId.toJSON(message.logId) : undefined);
+        message.checkpointKeyId !== undefined &&
+            (obj.checkpointKeyId = message.checkpointKeyId ? sigstore_common_1.LogId.toJSON(message.checkpointKeyId) : undefined);
         return obj;
     },
 };
@@ -79893,6 +79896,63 @@ function wrappy (fn, cb) {
 }
 
 
+/***/ }),
+
+/***/ 26056:
+/***/ ((__unused_webpack_module, exports, __nccwpck_require__) => {
+
+"use strict";
+
+Object.defineProperty(exports, "__esModule", ({ value: true }));
+exports.createAttestation = void 0;
+const attest_1 = __nccwpck_require__(74113);
+const oci_1 = __nccwpck_require__(47353);
+const OCI_TIMEOUT = 2000;
+const OCI_RETRY = 3;
+const createAttestation = async (subject, predicate, opts) => {
+    // Sign provenance w/ Sigstore
+    const attestation = await (0, attest_1.attest)({
+        subjectName: subject.name,
+        subjectDigest: subject.digest,
+        predicateType: predicate.type,
+        predicate: predicate.params,
+        sigstore: opts.sigstoreInstance,
+        token: opts.githubToken
+    });
+    const subDigest = subjectDigest(subject);
+    const result = {
+        ...attestation,
+        subjectName: subject.name,
+        subjectDigest: subDigest
+    };
+    if (opts.pushToRegistry) {
+        const credentials = (0, oci_1.getRegistryCredentials)(subject.name);
+        const artifact = await (0, oci_1.attachArtifactToImage)({
+            credentials,
+            imageName: subject.name,
+            imageDigest: subDigest,
+            artifact: Buffer.from(JSON.stringify(attestation.bundle)),
+            mediaType: attestation.bundle.mediaType,
+            annotations: {
+                'dev.sigstore.bundle.content': 'dsse-envelope',
+                'dev.sigstore.bundle.predicateType': predicate.type
+            },
+            fetchOpts: { timeout: OCI_TIMEOUT, retry: OCI_RETRY }
+        });
+        // Add the attestation's digest to the result
+        result.attestationDigest = artifact.digest;
+    }
+    return result;
+};
+exports.createAttestation = createAttestation;
+// Returns the subject's digest as a formatted string of the form
+// "<algorithm>:<digest>".
+const subjectDigest = (subject) => {
+    const alg = Object.keys(subject.digest).sort()[0];
+    return `${alg}:${subject.digest[alg]}`;
+};
+
+
 /***/ }),
 
 /***/ 69112:
@@ -79905,6 +79965,61 @@ exports.SEARCH_PUBLIC_GOOD_URL = void 0;
 exports.SEARCH_PUBLIC_GOOD_URL = 'https://search.sigstore.dev';
 
 
+/***/ }),
+
+/***/ 6144:
+/***/ (function(__unused_webpack_module, exports, __nccwpck_require__) {
+
+"use strict";
+
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", ({ value: true }));
+/**
+ * The entrypoint for the action.
+ */
+const core = __importStar(__nccwpck_require__(42186));
+const main_1 = __nccwpck_require__(70399);
+const DEFAULT_BATCH_SIZE = 50;
+const inputs = {
+    subjectPath: core.getInput('subject-path'),
+    subjectName: core.getInput('subject-name'),
+    subjectDigest: core.getInput('subject-digest'),
+    predicateType: core.getInput('predicate-type'),
+    predicate: core.getInput('predicate'),
+    predicatePath: core.getInput('predicate-path'),
+    pushToRegistry: core.getBooleanInput('push-to-registry'),
+    githubToken: core.getInput('github-token'),
+    // undocumented -- not part of public interface
+    privateSigning: ['true', 'True', 'TRUE', '1'].includes(core.getInput('private-signing')),
+    // internal only
+    batchSize: DEFAULT_BATCH_SIZE
+};
+// eslint-disable-next-line @typescript-eslint/no-floating-promises
+(0, main_1.run)(inputs);
+
+
 /***/ }),
 
 /***/ 70399:
@@ -79940,23 +80055,19 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.run = void 0;
-const attest_1 = __nccwpck_require__(74113);
 const core = __importStar(__nccwpck_require__(42186));
 const github = __importStar(__nccwpck_require__(95438));
-const oci_1 = __nccwpck_require__(47353);
 const fs_1 = __importDefault(__nccwpck_require__(57147));
 const os_1 = __importDefault(__nccwpck_require__(22037));
 const path_1 = __importDefault(__nccwpck_require__(71017));
+const attest_1 = __nccwpck_require__(26056);
 const endpoints_1 = __nccwpck_require__(69112);
 const predicate_1 = __nccwpck_require__(72103);
+const style = __importStar(__nccwpck_require__(41583));
 const subject_1 = __nccwpck_require__(95206);
-const COLOR_CYAN = '\x1B[36m';
-const COLOR_GRAY = '\x1B[38;5;244m';
-const COLOR_DEFAULT = '\x1B[39m';
 const ATTESTATION_FILE_NAME = 'attestation.jsonl';
-const MAX_SUBJECT_COUNT = 64;
-const OCI_TIMEOUT = 2000;
-const OCI_RETRY = 3;
+const DELAY_INTERVAL_MS = 75;
+const DELAY_MAX_MS = 1200;
 /* istanbul ignore next */
 const logHandler = (level, ...args) => {
     // Send any HTTP-related log events to the GitHub Actions debug log
@@ -79968,13 +80079,13 @@ const logHandler = (level, ...args) => {
  * The main function for the action.
  * @returns {Promise<void>} Resolves when the action is complete.
  */
-async function run() {
+async function run(inputs) {
     process.on('log', logHandler);
     // Provenance visibility will be public ONLY if we can confirm that the
     // repository is public AND the undocumented "private-signing" arg is NOT set.
     // Otherwise, it will be private.
     const sigstoreInstance = github.context.payload.repository?.visibility === 'public' &&
-        core.getInput('private-signing') !== 'true'
+        !inputs.privateSigning
         ? 'public-good'
         : 'github';
     try {
@@ -79982,35 +80093,41 @@ async function run() {
         if (!process.env.ACTIONS_ID_TOKEN_REQUEST_URL) {
             throw new Error('missing "id-token" permission. Please add "permissions: id-token: write" to your workflow.');
         }
-        // Gather list of subjets
-        const subjects = await (0, subject_1.subjectFromInputs)();
-        if (subjects.length > MAX_SUBJECT_COUNT) {
-            throw new Error(`Too many subjects specified. The maximum number of subjects is ${MAX_SUBJECT_COUNT}.`);
-        }
-        const predicate = (0, predicate_1.predicateFromInputs)();
+        const subjects = await (0, subject_1.subjectFromInputs)({
+            ...inputs,
+            downcaseName: inputs.pushToRegistry
+        });
+        const predicate = (0, predicate_1.predicateFromInputs)(inputs);
         const outputPath = path_1.default.join(tempDir(), ATTESTATION_FILE_NAME);
-        // Generate attestations for each subject serially
-        for (const subject of subjects) {
-            const att = await createAttestation(subject, predicate, sigstoreInstance);
-            // Write attestation bundle to output file
-            fs_1.default.writeFileSync(outputPath, JSON.stringify(att.bundle) + os_1.default.EOL, {
-                encoding: 'utf-8',
-                flag: 'a'
-            });
-            if (att.attestationID) {
-                atts.push({ subject, attestationID: att.attestationID });
-            }
-        }
-        if (atts.length > 0) {
-            core.summary.addHeading(
-            /* istanbul ignore next */
-            atts.length > 1 ? 'Attestations Created' : 'Attestation Created', 3);
-            for (const { subject, attestationID } of atts) {
-                core.summary.addLink(`${subject.name}@${subjectDigest(subject)}`, attestationURL(attestationID));
-            }
-            core.summary.write();
-        }
         core.setOutput('bundle-path', outputPath);
+        const subjectChunks = chunkArray(subjects, inputs.batchSize);
+        // Generate attestations for each subject serially, working in batches
+        for (let i = 0; i < subjectChunks.length; i++) {
+            if (subjectChunks.length > 1) {
+                core.info(`Processing subject batch ${i + 1}/${subjectChunks.length}`);
+            }
+            // Calculate the delay time for this batch
+            const delayTime = delay(i);
+            for (const subject of subjectChunks[i]) {
+                // Delay between attestations (only when chunk size > 1)
+                if (i > 0) {
+                    await new Promise(resolve => setTimeout(resolve, delayTime));
+                }
+                const att = await (0, attest_1.createAttestation)(subject, predicate, {
+                    sigstoreInstance,
+                    pushToRegistry: inputs.pushToRegistry,
+                    githubToken: inputs.githubToken
+                });
+                atts.push(att);
+                logAttestation(att, sigstoreInstance);
+                // Write attestation bundle to output file
+                fs_1.default.writeFileSync(outputPath, JSON.stringify(att.bundle) + os_1.default.EOL, {
+                    encoding: 'utf-8',
+                    flag: 'a'
+                });
+            }
+        }
+        logSummary(atts);
     }
     catch (err) {
         // Fail the workflow run if an error occurs
@@ -80019,7 +80136,7 @@ async function run() {
         /* istanbul ignore if */
         if (err instanceof Error && 'cause' in err) {
             const innerErr = err.cause;
-            core.info(mute(innerErr instanceof Error ? innerErr.toString() : `${innerErr}`));
+            core.info(style.mute(innerErr instanceof Error ? innerErr.toString() : `${innerErr}`));
         }
     }
     finally {
@@ -80027,53 +80144,40 @@ async function run() {
     }
 }
 exports.run = run;
-const createAttestation = async (subject, predicate, sigstoreInstance) => {
-    // Sign provenance w/ Sigstore
-    const attestation = await (0, attest_1.attest)({
-        subjectName: subject.name,
-        subjectDigest: subject.digest,
-        predicateType: predicate.type,
-        predicate: predicate.params,
-        sigstore: sigstoreInstance,
-        token: core.getInput('github-token')
-    });
-    core.info(`Attestation created for ${subject.name}@${subjectDigest(subject)}`);
+// Log details about the attestation to the GitHub Actions run
+const logAttestation = (attestation, sigstoreInstance) => {
+    core.info(`Attestation created for ${attestation.subjectName}@${attestation.subjectDigest}`);
     const instanceName = sigstoreInstance === 'public-good' ? 'Public Good' : 'GitHub';
-    core.startGroup(highlight(`Attestation signed using certificate from ${instanceName} Sigstore instance`));
+    core.startGroup(style.highlight(`Attestation signed using certificate from ${instanceName} Sigstore instance`));
     core.info(attestation.certificate);
     core.endGroup();
     if (attestation.tlogID) {
-        core.info(highlight('Attestation signature uploaded to Rekor transparency log'));
+        core.info(style.highlight('Attestation signature uploaded to Rekor transparency log'));
         core.info(`${endpoints_1.SEARCH_PUBLIC_GOOD_URL}?logIndex=${attestation.tlogID}`);
     }
     if (attestation.attestationID) {
-        core.info(highlight('Attestation uploaded to repository'));
+        core.info(style.highlight('Attestation uploaded to repository'));
         core.info(attestationURL(attestation.attestationID));
     }
-    if (core.getBooleanInput('push-to-registry', { required: false })) {
-        const credentials = (0, oci_1.getRegistryCredentials)(subject.name);
-        const artifact = await (0, oci_1.attachArtifactToImage)({
-            credentials,
-            imageName: subject.name,
-            imageDigest: subjectDigest(subject),
-            artifact: Buffer.from(JSON.stringify(attestation.bundle)),
-            mediaType: attestation.bundle.mediaType,
-            annotations: {
-                'dev.sigstore.bundle.content': 'dsse-envelope',
-                'dev.sigstore.bundle.predicateType': core.getInput('predicate-type')
-            },
-            fetchOpts: { timeout: OCI_TIMEOUT, retry: OCI_RETRY }
-        });
-        core.info(highlight('Attestation uploaded to registry'));
-        core.info(`${subject.name}@${artifact.digest}`);
+    if (attestation.attestationDigest) {
+        core.info(style.highlight('Attestation uploaded to registry'));
+        core.info(`${attestation.subjectName}@${attestation.attestationDigest}`);
+    }
+};
+// Attach summary information to the GitHub Actions run
+const logSummary = (attestations) => {
+    if (attestations.length > 0) {
+        core.summary.addHeading(
+        /* istanbul ignore next */
+        attestations.length > 1 ? 'Attestations Created' : 'Attestation Created', 3);
+        for (const { subjectName, subjectDigest, attestationID } of attestations) {
+            if (attestationID) {
+                core.summary.addLink(`${subjectName}@${subjectDigest}`, attestationURL(attestationID));
+            }
+        }
+        core.summary.write();
     }
-    return attestation;
 };
-// Emphasis string using ANSI color codes
-const highlight = (str) => `${COLOR_CYAN}${str}${COLOR_DEFAULT}`;
-// De-emphasize string using ANSI color codes
-/* istanbul ignore next */
-const mute = (str) => `${COLOR_GRAY}${str}${COLOR_DEFAULT}`;
 const tempDir = () => {
     const basePath = process.env['RUNNER_TEMP'];
     /* istanbul ignore if */
@@ -80082,12 +80186,13 @@ const tempDir = () => {
     }
     return fs_1.default.mkdtempSync(path_1.default.join(basePath, path_1.default.sep));
 };
-// Returns the subject's digest as a formatted string of the form
-// "<algorithm>:<digest>".
-const subjectDigest = (subject) => {
-    const alg = Object.keys(subject.digest).sort()[0];
-    return `${alg}:${subject.digest[alg]}`;
+// Transforms an array into an array of arrays, each containing at most
+// `chunkSize` elements.
+const chunkArray = (array, chunkSize) => {
+    return Array.from({ length: Math.ceil(array.length / chunkSize) }, (_, index) => array.slice(index * chunkSize, (index + 1) * chunkSize));
 };
+// Calculate the delay time for a given iteration
+const delay = (iteration) => Math.min(DELAY_INTERVAL_MS * 2 ** iteration, DELAY_MAX_MS);
 const attestationURL = (id) => `${github.context.serverUrl}/${github.context.repo.owner}/${github.context.repo.repo}/attestations/${id}`;
 
 
@@ -80098,56 +80203,68 @@ const attestationURL = (id) => `${github.context.serverUrl}/${github.context.rep
 
 "use strict";
 
-var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    var desc = Object.getOwnPropertyDescriptor(m, k);
-    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
-      desc = { enumerable: true, get: function() { return m[k]; } };
-    }
-    Object.defineProperty(o, k2, desc);
-}) : (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    o[k2] = m[k];
-}));
-var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
-    Object.defineProperty(o, "default", { enumerable: true, value: v });
-}) : function(o, v) {
-    o["default"] = v;
-});
-var __importStar = (this && this.__importStar) || function (mod) {
-    if (mod && mod.__esModule) return mod;
-    var result = {};
-    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
-    __setModuleDefault(result, mod);
-    return result;
-};
 var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.predicateFromInputs = void 0;
-const core = __importStar(__nccwpck_require__(42186));
 const fs_1 = __importDefault(__nccwpck_require__(57147));
+const MAX_PREDICATE_SIZE_BYTES = 16 * 1024 * 1024;
 // Returns the predicate specified by the action's inputs. The predicate value
 // may be specified as a path to a file or as a string.
-const predicateFromInputs = () => {
-    const predicateType = core.getInput('predicate-type', { required: true });
-    const predicateStr = core.getInput('predicate', { required: false });
-    const predicatePath = core.getInput('predicate-path', { required: false });
-    if (!predicatePath && !predicateStr) {
+const predicateFromInputs = (inputs) => {
+    const { predicateType, predicate, predicatePath } = inputs;
+    if (!predicateType) {
+        throw new Error('predicate-type must be provided');
+    }
+    if (!predicatePath && !predicate) {
         throw new Error('One of predicate-path or predicate must be provided');
     }
-    if (predicatePath && predicateStr) {
+    if (predicatePath && predicate) {
         throw new Error('Only one of predicate-path or predicate may be provided');
     }
-    const params = predicatePath
-        ? fs_1.default.readFileSync(predicatePath, 'utf-8')
-        : predicateStr;
+    let params = predicate;
+    if (predicatePath) {
+        if (!fs_1.default.existsSync(predicatePath)) {
+            throw new Error(`predicate file not found: ${predicatePath}`);
+        }
+        /* istanbul ignore next */
+        if (fs_1.default.statSync(predicatePath).size > MAX_PREDICATE_SIZE_BYTES) {
+            throw new Error(`predicate file exceeds maximum allowed size: ${MAX_PREDICATE_SIZE_BYTES} bytes`);
+        }
+        params = fs_1.default.readFileSync(predicatePath, 'utf-8');
+    }
+    else {
+        if (predicate.length > MAX_PREDICATE_SIZE_BYTES) {
+            throw new Error(`predicate string exceeds maximum allowed size: ${MAX_PREDICATE_SIZE_BYTES} bytes`);
+        }
+        params = predicate;
+    }
     return { type: predicateType, params: JSON.parse(params) };
 };
 exports.predicateFromInputs = predicateFromInputs;
 
 
+/***/ }),
+
+/***/ 41583:
+/***/ ((__unused_webpack_module, exports) => {
+
+"use strict";
+
+Object.defineProperty(exports, "__esModule", ({ value: true }));
+exports.mute = exports.highlight = void 0;
+const COLOR_CYAN = '\x1B[36m';
+const COLOR_GRAY = '\x1B[38;5;244m';
+const COLOR_DEFAULT = '\x1B[39m';
+// Emphasis string using ANSI color codes
+const highlight = (str) => `${COLOR_CYAN}${str}${COLOR_DEFAULT}`;
+exports.highlight = highlight;
+// De-emphasize string using ANSI color codes
+const mute = (str) => `${COLOR_GRAY}${str}${COLOR_DEFAULT}`;
+exports.mute = mute;
+
+
 /***/ }),
 
 /***/ 95206:
@@ -80183,24 +80300,19 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.subjectFromInputs = void 0;
-const core = __importStar(__nccwpck_require__(42186));
 const glob = __importStar(__nccwpck_require__(28090));
 const crypto_1 = __importDefault(__nccwpck_require__(6113));
 const sync_1 = __nccwpck_require__(74393);
 const fs_1 = __importDefault(__nccwpck_require__(57147));
 const path_1 = __importDefault(__nccwpck_require__(71017));
+const MAX_SUBJECT_COUNT = 2500;
 const DIGEST_ALGORITHM = 'sha256';
 // Returns the subject specified by the action's inputs. The subject may be
 // specified as a path to a file or as a digest. If a path is provided, the
 // file's digest is calculated and returned along with the subject's name. If a
 // digest is provided, the name must also be provided.
-const subjectFromInputs = async () => {
-    const subjectPath = core.getInput('subject-path', { required: false });
-    const subjectDigest = core.getInput('subject-digest', { required: false });
-    const subjectName = core.getInput('subject-name', { required: false });
-    const pushToRegistry = core.getBooleanInput('push-to-registry', {
-        required: false
-    });
+const subjectFromInputs = async (inputs) => {
+    const { subjectPath, subjectDigest, subjectName, downcaseName } = inputs;
     if (!subjectPath && !subjectDigest) {
         throw new Error('One of subject-path or subject-digest must be provided');
     }
@@ -80212,7 +80324,7 @@ const subjectFromInputs = async () => {
     }
     // If push-to-registry is enabled, ensure the subject name is lowercase
     // to conform to OCI image naming conventions
-    const name = pushToRegistry ? subjectName.toLowerCase() : subjectName;
+    const name = downcaseName ? subjectName.toLowerCase() : subjectName;
     if (subjectPath) {
         return await getSubjectFromPath(subjectPath, name);
     }
@@ -80224,27 +80336,31 @@ exports.subjectFromInputs = subjectFromInputs;
 // Returns the subject specified by the path to a file. The file's digest is
 // calculated and returned along with the subject's name.
 const getSubjectFromPath = async (subjectPath, subjectName) => {
-    const subjects = [];
+    const digestedSubjects = [];
+    const files = [];
     // Parse the list of subject paths
     const subjectPaths = parseList(subjectPath);
+    // Expand the globbed paths to a list of files
     for (const subPath of subjectPaths) {
-        // Expand the globbed path to a list of files
         /* eslint-disable-next-line github/no-then */
-        const files = await glob.create(subPath).then(async (g) => g.glob());
-        for (const file of files) {
-            // Skip anything that is NOT a file
-            if (!fs_1.default.statSync(file).isFile()) {
-                continue;
-            }
-            const name = subjectName || path_1.default.parse(file).base;
-            const digest = await digestFile(DIGEST_ALGORITHM, file);
-            subjects.push({ name, digest: { [DIGEST_ALGORITHM]: digest } });
-        }
+        files.push(...(await glob.create(subPath).then(async (g) => g.glob())));
     }
-    if (subjects.length === 0) {
+    if (files.length > MAX_SUBJECT_COUNT) {
+        throw new Error(`Too many subjects specified. The maximum number of subjects is ${MAX_SUBJECT_COUNT}.`);
+    }
+    for (const file of files) {
+        // Skip anything that is NOT a file
+        if (!fs_1.default.statSync(file).isFile()) {
+            continue;
+        }
+        const name = subjectName || path_1.default.parse(file).base;
+        const digest = await digestFile(DIGEST_ALGORITHM, file);
+        digestedSubjects.push({ name, digest: { [DIGEST_ALGORITHM]: digest } });
+    }
+    if (digestedSubjects.length === 0) {
         throw new Error(`Could not find subject at path ${subjectPath}`);
     }
-    return Promise.all(subjects);
+    return digestedSubjects;
 };
 // Returns the subject specified by the digest of a file. The digest is returned
 // along with the subject's name.
@@ -80423,6 +80539,14 @@ module.exports = require("node:fs");
 
 /***/ }),
 
+/***/ 93977:
+/***/ ((module) => {
+
+"use strict";
+module.exports = require("node:fs/promises");
+
+/***/ }),
+
 /***/ 70612:
 /***/ ((module) => {
 
@@ -80447,6 +80571,22 @@ module.exports = require("node:stream");
 
 /***/ }),
 
+/***/ 76915:
+/***/ ((module) => {
+
+"use strict";
+module.exports = require("node:string_decoder");
+
+/***/ }),
+
+/***/ 41041:
+/***/ ((module) => {
+
+"use strict";
+module.exports = require("node:url");
+
+/***/ }),
+
 /***/ 47261:
 /***/ ((module) => {
 
@@ -88350,9 +88490,9 @@ const proc = typeof process === 'object' && process
         stdout: null,
         stderr: null,
     };
-const events_1 = __nccwpck_require__(82361);
-const stream_1 = __importDefault(__nccwpck_require__(12781));
-const string_decoder_1 = __nccwpck_require__(71576);
+const node_events_1 = __nccwpck_require__(15673);
+const node_stream_1 = __importDefault(__nccwpck_require__(84492));
+const node_string_decoder_1 = __nccwpck_require__(76915);
 /**
  * Return true if the argument is a Minipass stream, Node stream, or something
  * else that Minipass can interact with.
@@ -88360,7 +88500,7 @@ const string_decoder_1 = __nccwpck_require__(71576);
 const isStream = (s) => !!s &&
     typeof s === 'object' &&
     (s instanceof Minipass ||
-        s instanceof stream_1.default ||
+        s instanceof node_stream_1.default ||
         (0, exports.isReadable)(s) ||
         (0, exports.isWritable)(s));
 exports.isStream = isStream;
@@ -88369,17 +88509,17 @@ exports.isStream = isStream;
  */
 const isReadable = (s) => !!s &&
     typeof s === 'object' &&
-    s instanceof events_1.EventEmitter &&
+    s instanceof node_events_1.EventEmitter &&
     typeof s.pipe === 'function' &&
     // node core Writable streams have a pipe() method, but it throws
-    s.pipe !== stream_1.default.Writable.prototype.pipe;
+    s.pipe !== node_stream_1.default.Writable.prototype.pipe;
 exports.isReadable = isReadable;
 /**
  * Return true if the argument is a valid {@link Minipass.Writable}
  */
 const isWritable = (s) => !!s &&
     typeof s === 'object' &&
-    s instanceof events_1.EventEmitter &&
+    s instanceof node_events_1.EventEmitter &&
     typeof s.write === 'function' &&
     typeof s.end === 'function';
 exports.isWritable = isWritable;
@@ -88486,7 +88626,7 @@ const isEncodingOptions = (o) => !o.objectMode && !!o.encoding && o.encoding !==
  * `Events` is the set of event handler signatures that this object
  * will emit, see {@link Minipass.Events}
  */
-class Minipass extends events_1.EventEmitter {
+class Minipass extends node_events_1.EventEmitter {
     [FLOWING] = false;
     [PAUSED] = false;
     [PIPES] = [];
@@ -88541,7 +88681,7 @@ class Minipass extends events_1.EventEmitter {
         }
         this[ASYNC] = !!options.async;
         this[DECODER] = this[ENCODING]
-            ? new string_decoder_1.StringDecoder(this[ENCODING])
+            ? new node_string_decoder_1.StringDecoder(this[ENCODING])
             : null;
         //@ts-ignore - private option for debugging and testing
         if (options && options.debugExposeBuffer === true) {
@@ -89400,14 +89540,14 @@ var __importStar = (this && this.__importStar) || function (mod) {
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.PathScurry = exports.Path = exports.PathScurryDarwin = exports.PathScurryPosix = exports.PathScurryWin32 = exports.PathScurryBase = exports.PathPosix = exports.PathWin32 = exports.PathBase = exports.ChildrenCache = exports.ResolveCache = void 0;
 const lru_cache_1 = __nccwpck_require__(66091);
-const path_1 = __nccwpck_require__(71017);
-const url_1 = __nccwpck_require__(57310);
-const actualFS = __importStar(__nccwpck_require__(57147));
+const node_path_1 = __nccwpck_require__(49411);
+const node_url_1 = __nccwpck_require__(41041);
 const fs_1 = __nccwpck_require__(57147);
+const actualFS = __importStar(__nccwpck_require__(87561));
 const realpathSync = fs_1.realpathSync.native;
 // TODO: test perf of fs/promises realpath vs realpathCB,
 // since the promises one uses realpath.native
-const promises_1 = __nccwpck_require__(73292);
+const promises_1 = __nccwpck_require__(93977);
 const minipass_1 = __nccwpck_require__(14968);
 const defaultFS = {
     lstatSync: fs_1.lstatSync,
@@ -89423,8 +89563,8 @@ const defaultFS = {
     },
 };
 // if they just gave us require('fs') then use our default
-const fsFromOption = (fsOption) => !fsOption || fsOption === defaultFS || fsOption === actualFS
-    ? defaultFS
+const fsFromOption = (fsOption) => !fsOption || fsOption === defaultFS || fsOption === actualFS ?
+    defaultFS
     : {
         ...defaultFS,
         ...fsOption,
@@ -89465,20 +89605,13 @@ const ENOREADLINK = 0b0001_0000_0000;
 const ENOREALPATH = 0b0010_0000_0000;
 const ENOCHILD = ENOTDIR | ENOENT | ENOREALPATH;
 const TYPEMASK = 0b0011_1111_1111;
-const entToType = (s) => s.isFile()
-    ? IFREG
-    : s.isDirectory()
-        ? IFDIR
-        : s.isSymbolicLink()
-            ? IFLNK
-            : s.isCharacterDevice()
-                ? IFCHR
-                : s.isBlockDevice()
-                    ? IFBLK
-                    : s.isSocket()
-                        ? IFSOCK
-                        : s.isFIFO()
-                            ? IFIFO
+const entToType = (s) => s.isFile() ? IFREG
+    : s.isDirectory() ? IFDIR
+        : s.isSymbolicLink() ? IFLNK
+            : s.isCharacterDevice() ? IFCHR
+                : s.isBlockDevice() ? IFBLK
+                    : s.isSocket() ? IFSOCK
+                        : s.isFIFO() ? IFIFO
                             : UNKNOWN;
 // normalize unicode path names
 const normalizeCache = new Map();
@@ -89582,6 +89715,11 @@ class PathBase {
      * @internal
      */
     nocase;
+    /**
+     * boolean indicating that this path is the current working directory
+     * of the PathScurry collection that contains it.
+     */
+    isCWD = false;
     // potential default fs override
     #fs;
     // Stats fields
@@ -89669,13 +89807,19 @@ class PathBase {
     #realpath;
     /**
      * This property is for compatibility with the Dirent class as of
-     * Node v20, where Dirent['path'] refers to the path of the directory
-     * that was passed to readdir.  So, somewhat counterintuitively, this
-     * property refers to the *parent* path, not the path object itself.
-     * For root entries, it's the path to the entry itself.
+     * Node v20, where Dirent['parentPath'] refers to the path of the
+     * directory that was passed to readdir. For root entries, it's the path
+     * to the entry itself.
+     */
+    get parentPath() {
+        return (this.parent || this).fullpath();
+    }
+    /**
+     * Deprecated alias for Dirent['parentPath'] Somewhat counterintuitively,
+     * this property refers to the *parent* path, not the path object itself.
      */
     get path() {
-        return (this.parent || this).fullpath();
+        return this.parentPath;
     }
     /**
      * Do not create new Path objects directly.  They should always be accessed
@@ -89730,8 +89874,8 @@ class PathBase {
         const rootPath = this.getRootString(path);
         const dir = path.substring(rootPath.length);
         const dirParts = dir.split(this.splitSep);
-        const result = rootPath
-            ? this.getRoot(rootPath).#resolveParts(dirParts)
+        const result = rootPath ?
+            this.getRoot(rootPath).#resolveParts(dirParts)
             : this.#resolveParts(dirParts);
         return result;
     }
@@ -89782,9 +89926,7 @@ class PathBase {
         }
         // find the child
         const children = this.children();
-        const name = this.nocase
-            ? normalizeNocase(pathPart)
-            : normalize(pathPart);
+        const name = this.nocase ? normalizeNocase(pathPart) : normalize(pathPart);
         for (const p of children) {
             if (p.#matchName === name) {
                 return p;
@@ -89794,9 +89936,7 @@ class PathBase {
         // actually exist.  If we know the parent isn't a dir, then
         // in fact it CAN'T exist.
         const s = this.parent ? this.sep : '';
-        const fullpath = this.#fullpath
-            ? this.#fullpath + s + pathPart
-            : undefined;
+        const fullpath = this.#fullpath ? this.#fullpath + s + pathPart : undefined;
         const pchild = this.newChild(pathPart, UNKNOWN, {
             ...opts,
             parent: this,
@@ -89815,6 +89955,8 @@ class PathBase {
      * the cwd, then this ends up being equivalent to the fullpath()
      */
     relative() {
+        if (this.isCWD)
+            return '';
         if (this.#relative !== undefined) {
             return this.#relative;
         }
@@ -89835,6 +89977,8 @@ class PathBase {
     relativePosix() {
         if (this.sep === '/')
             return this.relative();
+        if (this.isCWD)
+            return '';
         if (this.#relativePosix !== undefined)
             return this.#relativePosix;
         const name = this.name;
@@ -89900,23 +90044,15 @@ class PathBase {
         return this[`is${type}`]();
     }
     getType() {
-        return this.isUnknown()
-            ? 'Unknown'
-            : this.isDirectory()
-                ? 'Directory'
-                : this.isFile()
-                    ? 'File'
-                    : this.isSymbolicLink()
-                        ? 'SymbolicLink'
-                        : this.isFIFO()
-                            ? 'FIFO'
-                            : this.isCharacterDevice()
-                                ? 'CharacterDevice'
-                                : this.isBlockDevice()
-                                    ? 'BlockDevice'
-                                    : /* c8 ignore start */ this.isSocket()
-                                        ? 'Socket'
-                                        : 'Unknown';
+        return (this.isUnknown() ? 'Unknown'
+            : this.isDirectory() ? 'Directory'
+                : this.isFile() ? 'File'
+                    : this.isSymbolicLink() ? 'SymbolicLink'
+                        : this.isFIFO() ? 'FIFO'
+                            : this.isCharacterDevice() ? 'CharacterDevice'
+                                : this.isBlockDevice() ? 'BlockDevice'
+                                    : /* c8 ignore start */ this.isSocket() ? 'Socket'
+                                        : 'Unknown');
         /* c8 ignore stop */
     }
     /**
@@ -90050,8 +90186,8 @@ class PathBase {
      * directly.
      */
     isNamed(n) {
-        return !this.nocase
-            ? this.#matchName === normalize(n)
+        return !this.nocase ?
+            this.#matchName === normalize(n)
             : this.#matchName === normalizeNocase(n);
     }
     /**
@@ -90107,7 +90243,7 @@ class PathBase {
         /* c8 ignore stop */
         try {
             const read = this.#fs.readlinkSync(this.fullpath());
-            const linkTarget = (this.parent.realpathSync())?.resolve(read);
+            const linkTarget = this.parent.realpathSync()?.resolve(read);
             if (linkTarget) {
                 return (this.#linkTarget = linkTarget);
             }
@@ -90228,9 +90364,7 @@ class PathBase {
     #readdirMaybePromoteChild(e, c) {
         for (let p = c.provisional; p < c.length; p++) {
             const pchild = c[p];
-            const name = this.nocase
-                ? normalizeNocase(e.name)
-                : normalize(e.name);
+            const name = this.nocase ? normalizeNocase(e.name) : normalize(e.name);
             if (name !== pchild.#matchName) {
                 continue;
             }
@@ -90529,6 +90663,8 @@ class PathBase {
     [setAsCwd](oldCwd) {
         if (oldCwd === this)
             return;
+        oldCwd.isCWD = false;
+        this.isCWD = true;
         const changed = new Set([]);
         let rp = [];
         let p = this;
@@ -90583,7 +90719,7 @@ class PathWin32 extends PathBase {
      * @internal
      */
     getRootString(path) {
-        return path_1.win32.parse(path).root;
+        return node_path_1.win32.parse(path).root;
     }
     /**
      * @internal
@@ -90705,7 +90841,7 @@ class PathScurryBase {
     constructor(cwd = process.cwd(), pathImpl, sep, { nocase, childrenCacheSize = 16 * 1024, fs = defaultFS, } = {}) {
         this.#fs = fsFromOption(fs);
         if (cwd instanceof URL || cwd.startsWith('file://')) {
-            cwd = (0, url_1.fileURLToPath)(cwd);
+            cwd = (0, node_url_1.fileURLToPath)(cwd);
         }
         // resolve and split root, and then add to the store.
         // this is the only time we call path.resolve()
@@ -91294,7 +91430,7 @@ class PathScurryWin32 extends PathScurryBase {
     sep = '\\';
     constructor(cwd = process.cwd(), opts = {}) {
         const { nocase = true } = opts;
-        super(cwd, path_1.win32, '\\', { ...opts, nocase });
+        super(cwd, node_path_1.win32, '\\', { ...opts, nocase });
         this.nocase = nocase;
         for (let p = this.cwd; p; p = p.parent) {
             p.nocase = this.nocase;
@@ -91307,7 +91443,7 @@ class PathScurryWin32 extends PathScurryBase {
         // if the path starts with a single separator, it's not a UNC, and we'll
         // just get separator as the root, and driveFromUNC will return \
         // In that case, mount \ on the root from the cwd.
-        return path_1.win32.parse(dir).root.toUpperCase();
+        return node_path_1.win32.parse(dir).root.toUpperCase();
     }
     /**
      * @internal
@@ -91337,7 +91473,7 @@ class PathScurryPosix extends PathScurryBase {
     sep = '/';
     constructor(cwd = process.cwd(), opts = {}) {
         const { nocase = false } = opts;
-        super(cwd, path_1.posix, '/', { ...opts, nocase });
+        super(cwd, node_path_1.posix, '/', { ...opts, nocase });
         this.nocase = nocase;
     }
     /**
@@ -91387,10 +91523,8 @@ exports.Path = process.platform === 'win32' ? PathWin32 : PathPosix;
  * {@link PathScurryWin32} on Windows systems, {@link PathScurryDarwin} on
  * Darwin (macOS) systems, {@link PathScurryPosix} on all others.
  */
-exports.PathScurry = process.platform === 'win32'
-    ? PathScurryWin32
-    : process.platform === 'darwin'
-        ? PathScurryDarwin
+exports.PathScurry = process.platform === 'win32' ? PathScurryWin32
+    : process.platform === 'darwin' ? PathScurryDarwin
         : PathScurryPosix;
 //# sourceMappingURL=index.js.map
 
@@ -93284,6 +93418,13 @@ const normalize_options = function(opts){
       `got ${JSON.stringify(options.on_record)}`
     ], options);
   }
+  // Normalize option `on_skip`
+  // options.on_skip ??= (err, chunk) => {
+  //   this.emit('skip', err, chunk);
+  // };
+  if(options.on_skip !== undefined && options.on_skip !== null && typeof options.on_skip !== 'function'){
+    throw new Error(`Invalid Option: on_skip must be a function, got ${JSON.stringify(options.on_skip)}`);
+  }
   // Normalize option `quote`
   if(options.quote === null || options.quote === false || options.quote === ''){
     options.quote = null;
@@ -94339,22 +94480,12 @@ module.exports = {"i8":"3.0.4"};
 /******/ 	if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = __dirname + "/";
 /******/ 	
 /************************************************************************/
-var __webpack_exports__ = {};
-// This entry need to be wrapped in an IIFE because it need to be in strict mode.
-(() => {
-"use strict";
-var exports = __webpack_exports__;
-
-Object.defineProperty(exports, "__esModule", ({ value: true }));
-/**
- * The entrypoint for the action.
- */
-const main_1 = __nccwpck_require__(70399);
-// eslint-disable-next-line @typescript-eslint/no-floating-promises
-(0, main_1.run)();
-
-})();
-
-module.exports = __webpack_exports__;
+/******/ 	
+/******/ 	// startup
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package-lock.json

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+        "commander": "~12.1.0",
         "get-stdin": "~9.0.0",
-        "glob": "~10.3.12",
+        "glob": "~10.4.1",
         "ignore": "~5.3.1",
         "js-yaml": "^4.1.0",
         "jsonc-parser": "~3.2.1",
@@ -12917,7 +12945,7 @@
         "markdownlint": "~0.34.0",
         "minimatch": "~9.0.4",
         "run-con": "~1.3.2",
-        "toml": "~3.0.0"
+        "smol-toml": "~1.2.0"
       },
       "dependencies": {
         "brace-expansion": {
@@ -12930,16 +12958,26 @@
           }
         },
         "glob": {
-          "version": "10.3.12",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-10.3.12.tgz",
-          "integrity": "sha512-TCNv8vJ+xz4QiqTpfOJA7HvYv+tNIRHKfUWw/q+v2jdgN4ebz+KY9tGx5J4rHP0o84mNP+ApH66HRX8us3Khqg==",
+          "version": "10.4.1",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-10.4.1.tgz",
+          "integrity": "sha512-2jelhlq3E4ho74ZyVLN03oKdAZVUa6UDZzFLVH1H7dnoax+y9qyaq8zBkfDIggjniU19z0wU18y16jMB2eyVIw==",
           "dev": true,
           "requires": {
             "foreground-child": "^3.1.0",
-            "jackspeak": "^2.3.6",
-            "minimatch": "^9.0.1",
-            "minipass": "^7.0.4",
-            "path-scurry": "^1.10.2"
+            "jackspeak": "^3.1.2",
+            "minimatch": "^9.0.4",
+            "minipass": "^7.1.2",
+            "path-scurry": "^1.11.1"
+          }
+        },
+        "jackspeak": {
+          "version": "3.1.2",
+          "resolved": "https://registry.npmjs.org/jackspeak/-/jackspeak-3.1.2.tgz",
+          "integrity": "sha512-kWmLKn2tRtfYMF/BakihVVRzBKOxz4gJMiL2Rj91WnAB5TPZumSH99R/Yf1qE1u4uRimvCSJfm6hnxohXeEXjQ==",
+          "dev": true,
+          "requires": {
+            "@isaacs/cliui": "^8.0.2",
+            "@pkgjs/parseargs": "^0.11.0"
           }
         },
         "minimatch": {
@@ -13007,7 +13045,9 @@
       "dev": true
     },
     "minipass": {
-      "version": "7.0.4"
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.2.tgz",
+      "integrity": "sha512-qOOzS1cBTWYF4BH8fVePDBOO9iptMnGUEZwNc/cMWnTV2nVLZ7VoNWEPHkYczZA0pdoA7dl6e7FL659nX9S2aw=="
     },
     "minipass-collect": {
       "version": "2.0.1",
@@ -13288,9 +13328,9 @@
       "dev": true
     },
     "path-scurry": {
-      "version": "1.10.2",
-      "resolved": "https://registry.npmjs.org/path-scurry/-/path-scurry-1.10.2.tgz",
-      "integrity": "sha512-7xTavNy5RQXnsjANvVvMkEjvloOinkAjv/Z6Ildz9v2RinZ4SBKTWFOVRbaF8p0vpHnyjV/UwNDdKuUv6M5qcA==",
+      "version": "1.11.1",
+      "resolved": "https://registry.npmjs.org/path-scurry/-/path-scurry-1.11.1.tgz",
+      "integrity": "sha512-Xa4Nw17FS9ApQFJ9umLiJS4orGjm7ZzwUrwamcGQuHSzDyth9boKDaycYdDcZDuqYATXw4HFXgaqWTctW/v1HA==",
       "requires": {
         "lru-cache": "^10.2.0",
         "minipass": "^5.0.0 || ^6.0.2 || ^7.0.0"
@@ -13788,6 +13828,12 @@
     "smart-buffer": {
       "version": "4.2.0"
     },
+    "smol-toml": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.2.0.tgz",
+      "integrity": "sha512-KObxdQANC/xje3OoatMbSwQf2XAvJ0RbK+4nmQRszFNZptbNRnMWqbLF/zb4sMi9xJ6HNyhWXeuZ9zC/I/XY7w==",
+      "dev": true
+    },
     "socks": {
       "version": "2.7.3",
       "requires": {
@@ -14017,12 +14063,6 @@
         "is-number": "^7.0.0"
       }
     },
-    "toml": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/toml/-/toml-3.0.0.tgz",
-      "integrity": "sha512-y/mWCZinnvxjTKYhJ+pYxwD0mRLVvOtdS2Awbgxln6iEnt4rk0yBxeSBHkGJcPucRiG0e55mwWp+g/05rsrd6w==",
-      "dev": true
-    },
     "ts-api-utils": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.3.0.tgz",
@@ -14031,7 +14071,9 @@
       "requires": {}
     },
     "ts-jest": {
-      "version": "29.1.2",
+      "version": "29.1.3",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.1.3.tgz",
+      "integrity": "sha512-6L9qz3ginTd1NKhOxmkP0qU3FyKjj5CPoY+anszfVn6Pmv/RIKzhiMCsH7Yb7UvJR9I2A64rm4zQl531s2F1iw==",
       "dev": true,
       "requires": {
         "bs-logger": "0.x",

package.json

@@ -1,7 +1,7 @@
 {
   "name": "actions/attest",
   "description": "Generate signed attestations for workflow artifacts",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "author": "",
   "private": true,
   "homepage": "https://github.com/actions/attest",
@@ -72,29 +72,29 @@
     "@actions/attest": "^1.2.1",
     "@actions/core": "^1.10.1",
     "@actions/glob": "^0.4.0",
-    "@sigstore/oci": "^0.3.3",
-    "csv-parse": "^5.5.5"
+    "@sigstore/oci": "^0.3.4",
+    "csv-parse": "^5.5.6"
   },
   "devDependencies": {
-    "@sigstore/mock": "^0.7.3",
+    "@sigstore/mock": "^0.7.4",
     "@types/jest": "^29.5.12",
     "@types/make-fetch-happen": "^10.0.4",
-    "@types/node": "^20.12.11",
-    "@typescript-eslint/eslint-plugin": "^7.9.0",
-    "@typescript-eslint/parser": "^7.9.0",
+    "@types/node": "^20.12.12",
+    "@typescript-eslint/eslint-plugin": "^7.11.0",
+    "@typescript-eslint/parser": "^7.11.0",
     "@vercel/ncc": "^0.38.1",
     "eslint": "^8.57.0",
     "eslint-plugin-github": "^4.10.2",
     "eslint-plugin-jest": "^28.5.0",
-    "eslint-plugin-jsonc": "^2.15.1",
+    "eslint-plugin-jsonc": "^2.16.0",
     "eslint-plugin-prettier": "^5.1.3",
     "jest": "^29.7.0",
     "js-yaml": "^4.1.0",
-    "markdownlint-cli": "^0.40.0",
+    "markdownlint-cli": "^0.41.0",
     "nock": "^13.5.4",
     "prettier": "^3.2.5",
     "prettier-eslint": "^16.3.0",
-    "ts-jest": "^29.1.2",
+    "ts-jest": "^29.1.3",
     "typescript": "^5.4.5",
     "undici": "^5.28.4"
   }

src/attest.ts

@@ -0,0 +1,67 @@
+import { Attestation, Predicate, Subject, attest } from '@actions/attest'
+import { attachArtifactToImage, getRegistryCredentials } from '@sigstore/oci'
+
+const OCI_TIMEOUT = 2000
+const OCI_RETRY = 3
+
+export type SigstoreInstance = 'public-good' | 'github'
+export type AttestResult = Attestation & {
+  subjectName: string
+  subjectDigest: string
+  attestationDigest?: string
+}
+
+export const createAttestation = async (
+  subject: Subject,
+  predicate: Predicate,
+  opts: {
+    sigstoreInstance: SigstoreInstance
+    pushToRegistry: boolean
+    githubToken: string
+  }
+): Promise<AttestResult> => {
+  // Sign provenance w/ Sigstore
+  const attestation = await attest({
+    subjectName: subject.name,
+    subjectDigest: subject.digest,
+    predicateType: predicate.type,
+    predicate: predicate.params,
+    sigstore: opts.sigstoreInstance,
+    token: opts.githubToken
+  })
+
+  const subDigest = subjectDigest(subject)
+  const result: AttestResult = {
+    ...attestation,
+    subjectName: subject.name,
+    subjectDigest: subDigest
+  }
+
+  if (opts.pushToRegistry) {
+    const credentials = getRegistryCredentials(subject.name)
+    const artifact = await attachArtifactToImage({
+      credentials,
+      imageName: subject.name,
+      imageDigest: subDigest,
+      artifact: Buffer.from(JSON.stringify(attestation.bundle)),
+      mediaType: attestation.bundle.mediaType,
+      annotations: {
+        'dev.sigstore.bundle.content': 'dsse-envelope',
+        'dev.sigstore.bundle.predicateType': predicate.type
+      },
+      fetchOpts: { timeout: OCI_TIMEOUT, retry: OCI_RETRY }
+    })
+
+    // Add the attestation's digest to the result
+    result.attestationDigest = artifact.digest
+  }
+
+  return result
+}
+
+// Returns the subject's digest as a formatted string of the form
+// "<algorithm>:<digest>".
+const subjectDigest = (subject: Subject): string => {
+  const alg = Object.keys(subject.digest).sort()[0]
+  return `${alg}:${subject.digest[alg]}`
+}

src/index.ts

@@ -1,7 +1,27 @@
 /**
  * The entrypoint for the action.
  */
-import { run } from './main'
+import * as core from '@actions/core'
+import { run, RunInputs } from './main'
+
+const DEFAULT_BATCH_SIZE = 50
+
+const inputs: RunInputs = {
+  subjectPath: core.getInput('subject-path'),
+  subjectName: core.getInput('subject-name'),
+  subjectDigest: core.getInput('subject-digest'),
+  predicateType: core.getInput('predicate-type'),
+  predicate: core.getInput('predicate'),
+  predicatePath: core.getInput('predicate-path'),
+  pushToRegistry: core.getBooleanInput('push-to-registry'),
+  githubToken: core.getInput('github-token'),
+  // undocumented -- not part of public interface
+  privateSigning: ['true', 'True', 'TRUE', '1'].includes(
+    core.getInput('private-signing')
+  ),
+  // internal only
+  batchSize: DEFAULT_BATCH_SIZE
+}
 
 // eslint-disable-next-line @typescript-eslint/no-floating-promises
-run()
+run(inputs)

src/main.ts

@@ -1,26 +1,25 @@
-import { Attestation, Predicate, Subject, attest } from '@actions/attest'
 import * as core from '@actions/core'
 import * as github from '@actions/github'
-import { attachArtifactToImage, getRegistryCredentials } from '@sigstore/oci'
 import fs from 'fs'
 import os from 'os'
 import path from 'path'
+import { AttestResult, SigstoreInstance, createAttestation } from './attest'
 import { SEARCH_PUBLIC_GOOD_URL } from './endpoints'
-import { predicateFromInputs } from './predicate'
-import { subjectFromInputs } from './subject'
+import { PredicateInputs, predicateFromInputs } from './predicate'
+import * as style from './style'
+import { SubjectInputs, subjectFromInputs } from './subject'
 
-type SigstoreInstance = 'public-good' | 'github'
-type AttestedSubject = { subject: Subject; attestationID: string }
-
-const COLOR_CYAN = '\x1B[36m'
-const COLOR_GRAY = '\x1B[38;5;244m'
-const COLOR_DEFAULT = '\x1B[39m'
 const ATTESTATION_FILE_NAME = 'attestation.jsonl'
+const DELAY_INTERVAL_MS = 75
+const DELAY_MAX_MS = 1200
 
-const MAX_SUBJECT_COUNT = 64
-
-const OCI_TIMEOUT = 2000
-const OCI_RETRY = 3
+export type RunInputs = SubjectInputs &
+  PredicateInputs & {
+    pushToRegistry: boolean
+    githubToken: string
+    privateSigning: boolean
+    batchSize: number
+  }
 
 /* istanbul ignore next */
 const logHandler = (level: string, ...args: unknown[]): void => {
@@ -34,7 +33,7 @@ const logHandler = (level: string, ...args: unknown[]): void => {
  * The main function for the action.
  * @returns {Promise<void>} Resolves when the action is complete.
  */
-export async function run(): Promise<void> {
+export async function run(inputs: RunInputs): Promise<void> {
   process.on('log', logHandler)
 
   // Provenance visibility will be public ONLY if we can confirm that the
@@ -42,61 +41,62 @@ export async function run(): Promise<void> {
   // Otherwise, it will be private.
   const sigstoreInstance: SigstoreInstance =
     github.context.payload.repository?.visibility === 'public' &&
-    core.getInput('private-signing') !== 'true'
+    !inputs.privateSigning
       ? 'public-good'
       : 'github'
 
   try {
-    const atts: AttestedSubject[] = []
+    const atts: AttestResult[] = []
     if (!process.env.ACTIONS_ID_TOKEN_REQUEST_URL) {
       throw new Error(
         'missing "id-token" permission. Please add "permissions: id-token: write" to your workflow.'
       )
     }
 
-    // Gather list of subjets
-    const subjects = await subjectFromInputs()
-    if (subjects.length > MAX_SUBJECT_COUNT) {
-      throw new Error(
-        `Too many subjects specified. The maximum number of subjects is ${MAX_SUBJECT_COUNT}.`
-      )
-    }
+    const subjects = await subjectFromInputs({
+      ...inputs,
+      downcaseName: inputs.pushToRegistry
+    })
+    const predicate = predicateFromInputs(inputs)
 
-    const predicate = predicateFromInputs()
     const outputPath = path.join(tempDir(), ATTESTATION_FILE_NAME)
-
-    // Generate attestations for each subject serially
-    for (const subject of subjects) {
-      const att = await createAttestation(subject, predicate, sigstoreInstance)
-
-      // Write attestation bundle to output file
-      fs.writeFileSync(outputPath, JSON.stringify(att.bundle) + os.EOL, {
-        encoding: 'utf-8',
-        flag: 'a'
-      })
-
-      if (att.attestationID) {
-        atts.push({ subject, attestationID: att.attestationID })
-      }
-    }
-
-    if (atts.length > 0) {
-      core.summary.addHeading(
-        /* istanbul ignore next */
-        atts.length > 1 ? 'Attestations Created' : 'Attestation Created',
-        3
-      )
-
-      for (const { subject, attestationID } of atts) {
-        core.summary.addLink(
-          `${subject.name}@${subjectDigest(subject)}`,
-          attestationURL(attestationID)
-        )
-      }
-      core.summary.write()
-    }
-
     core.setOutput('bundle-path', outputPath)
+
+    const subjectChunks = chunkArray(subjects, inputs.batchSize)
+
+    // Generate attestations for each subject serially, working in batches
+    for (let i = 0; i < subjectChunks.length; i++) {
+      if (subjectChunks.length > 1) {
+        core.info(`Processing subject batch ${i + 1}/${subjectChunks.length}`)
+      }
+
+      // Calculate the delay time for this batch
+      const delayTime = delay(i)
+
+      for (const subject of subjectChunks[i]) {
+        // Delay between attestations (only when chunk size > 1)
+        if (i > 0) {
+          await new Promise(resolve => setTimeout(resolve, delayTime))
+        }
+
+        const att = await createAttestation(subject, predicate, {
+          sigstoreInstance,
+          pushToRegistry: inputs.pushToRegistry,
+          githubToken: inputs.githubToken
+        })
+        atts.push(att)
+
+        logAttestation(att, sigstoreInstance)
+
+        // Write attestation bundle to output file
+        fs.writeFileSync(outputPath, JSON.stringify(att.bundle) + os.EOL, {
+          encoding: 'utf-8',
+          flag: 'a'
+        })
+      }
+    }
+
+    logSummary(atts)
   } catch (err) {
     // Fail the workflow run if an error occurs
     core.setFailed(
@@ -108,7 +108,9 @@ export async function run(): Promise<void> {
     if (err instanceof Error && 'cause' in err) {
       const innerErr = err.cause
       core.info(
-        mute(innerErr instanceof Error ? innerErr.toString() : `${innerErr}`)
+        style.mute(
+          innerErr instanceof Error ? innerErr.toString() : `${innerErr}`
+        )
       )
     }
   } finally {
@@ -116,27 +118,19 @@ export async function run(): Promise<void> {
   }
 }
 
-const createAttestation = async (
-  subject: Subject,
-  predicate: Predicate,
+// Log details about the attestation to the GitHub Actions run
+const logAttestation = (
+  attestation: AttestResult,
   sigstoreInstance: SigstoreInstance
-): Promise<Attestation> => {
-  // Sign provenance w/ Sigstore
-  const attestation = await attest({
-    subjectName: subject.name,
-    subjectDigest: subject.digest,
-    predicateType: predicate.type,
-    predicate: predicate.params,
-    sigstore: sigstoreInstance,
-    token: core.getInput('github-token')
-  })
-
-  core.info(`Attestation created for ${subject.name}@${subjectDigest(subject)}`)
+): void => {
+  core.info(
+    `Attestation created for ${attestation.subjectName}@${attestation.subjectDigest}`
+  )
 
   const instanceName =
     sigstoreInstance === 'public-good' ? 'Public Good' : 'GitHub'
   core.startGroup(
-    highlight(
+    style.highlight(
       `Attestation signed using certificate from ${instanceName} Sigstore instance`
     )
   )
@@ -145,43 +139,44 @@ const createAttestation = async (
 
   if (attestation.tlogID) {
     core.info(
-      highlight('Attestation signature uploaded to Rekor transparency log')
+      style.highlight(
+        'Attestation signature uploaded to Rekor transparency log'
+      )
     )
     core.info(`${SEARCH_PUBLIC_GOOD_URL}?logIndex=${attestation.tlogID}`)
   }
 
   if (attestation.attestationID) {
-    core.info(highlight('Attestation uploaded to repository'))
+    core.info(style.highlight('Attestation uploaded to repository'))
     core.info(attestationURL(attestation.attestationID))
   }
 
-  if (core.getBooleanInput('push-to-registry', { required: false })) {
-    const credentials = getRegistryCredentials(subject.name)
-    const artifact = await attachArtifactToImage({
-      credentials,
-      imageName: subject.name,
-      imageDigest: subjectDigest(subject),
-      artifact: Buffer.from(JSON.stringify(attestation.bundle)),
-      mediaType: attestation.bundle.mediaType,
-      annotations: {
-        'dev.sigstore.bundle.content': 'dsse-envelope',
-        'dev.sigstore.bundle.predicateType': core.getInput('predicate-type')
-      },
-      fetchOpts: { timeout: OCI_TIMEOUT, retry: OCI_RETRY }
-    })
-    core.info(highlight('Attestation uploaded to registry'))
-    core.info(`${subject.name}@${artifact.digest}`)
+  if (attestation.attestationDigest) {
+    core.info(style.highlight('Attestation uploaded to registry'))
+    core.info(`${attestation.subjectName}@${attestation.attestationDigest}`)
   }
-
-  return attestation
 }
 
-// Emphasis string using ANSI color codes
-const highlight = (str: string): string => `${COLOR_CYAN}${str}${COLOR_DEFAULT}`
+// Attach summary information to the GitHub Actions run
+const logSummary = (attestations: AttestResult[]): void => {
+  if (attestations.length > 0) {
+    core.summary.addHeading(
+      /* istanbul ignore next */
+      attestations.length > 1 ? 'Attestations Created' : 'Attestation Created',
+      3
+    )
 
-// De-emphasize string using ANSI color codes
-/* istanbul ignore next */
-const mute = (str: string): string => `${COLOR_GRAY}${str}${COLOR_DEFAULT}`
+    for (const { subjectName, subjectDigest, attestationID } of attestations) {
+      if (attestationID) {
+        core.summary.addLink(
+          `${subjectName}@${subjectDigest}`,
+          attestationURL(attestationID)
+        )
+      }
+    }
+    core.summary.write()
+  }
+}
 
 const tempDir = (): string => {
   const basePath = process.env['RUNNER_TEMP']
@@ -194,12 +189,18 @@ const tempDir = (): string => {
   return fs.mkdtempSync(path.join(basePath, path.sep))
 }
 
-// Returns the subject's digest as a formatted string of the form
-// "<algorithm>:<digest>".
-const subjectDigest = (subject: Subject): string => {
-  const alg = Object.keys(subject.digest).sort()[0]
-  return `${alg}:${subject.digest[alg]}`
+// Transforms an array into an array of arrays, each containing at most
+// `chunkSize` elements.
+const chunkArray = <T>(array: T[], chunkSize: number): T[][] => {
+  return Array.from(
+    { length: Math.ceil(array.length / chunkSize) },
+    (_, index) => array.slice(index * chunkSize, (index + 1) * chunkSize)
+  )
 }
 
+// Calculate the delay time for a given iteration
+const delay = (iteration: number): number =>
+  Math.min(DELAY_INTERVAL_MS * 2 ** iteration, DELAY_MAX_MS)
+
 const attestationURL = (id: string): string =>
   `${github.context.serverUrl}/${github.context.repo.owner}/${github.context.repo.repo}/attestations/${id}`

src/predicate.ts

@@ -1,26 +1,56 @@
-import * as core from '@actions/core'
 import fs from 'fs'
 
 import type { Predicate } from '@actions/attest'
 
+export type PredicateInputs = {
+  predicateType: string
+  predicate: string
+  predicatePath: string
+}
+
+const MAX_PREDICATE_SIZE_BYTES = 16 * 1024 * 1024
+
 // Returns the predicate specified by the action's inputs. The predicate value
 // may be specified as a path to a file or as a string.
-export const predicateFromInputs = (): Predicate => {
-  const predicateType = core.getInput('predicate-type', { required: true })
-  const predicateStr = core.getInput('predicate', { required: false })
-  const predicatePath = core.getInput('predicate-path', { required: false })
+export const predicateFromInputs = (inputs: PredicateInputs): Predicate => {
+  const { predicateType, predicate, predicatePath } = inputs
 
-  if (!predicatePath && !predicateStr) {
+  if (!predicateType) {
+    throw new Error('predicate-type must be provided')
+  }
+
+  if (!predicatePath && !predicate) {
     throw new Error('One of predicate-path or predicate must be provided')
   }
 
-  if (predicatePath && predicateStr) {
+  if (predicatePath && predicate) {
     throw new Error('Only one of predicate-path or predicate may be provided')
   }
 
-  const params = predicatePath
-    ? fs.readFileSync(predicatePath, 'utf-8')
-    : predicateStr
+  let params: string = predicate
+
+  if (predicatePath) {
+    if (!fs.existsSync(predicatePath)) {
+      throw new Error(`predicate file not found: ${predicatePath}`)
+    }
+
+    /* istanbul ignore next */
+    if (fs.statSync(predicatePath).size > MAX_PREDICATE_SIZE_BYTES) {
+      throw new Error(
+        `predicate file exceeds maximum allowed size: ${MAX_PREDICATE_SIZE_BYTES} bytes`
+      )
+    }
+
+    params = fs.readFileSync(predicatePath, 'utf-8')
+  } else {
+    if (predicate.length > MAX_PREDICATE_SIZE_BYTES) {
+      throw new Error(
+        `predicate string exceeds maximum allowed size: ${MAX_PREDICATE_SIZE_BYTES} bytes`
+      )
+    }
+
+    params = predicate
+  }
 
   return { type: predicateType, params: JSON.parse(params) }
 }

src/style.ts

@@ -0,0 +1,11 @@
+const COLOR_CYAN = '\x1B[36m'
+const COLOR_GRAY = '\x1B[38;5;244m'
+const COLOR_DEFAULT = '\x1B[39m'
+
+// Emphasis string using ANSI color codes
+export const highlight = (str: string): string =>
+  `${COLOR_CYAN}${str}${COLOR_DEFAULT}`
+
+// De-emphasize string using ANSI color codes
+export const mute = (str: string): string =>
+  `${COLOR_GRAY}${str}${COLOR_DEFAULT}`

src/subject.ts

@@ -1,4 +1,3 @@
-import * as core from '@actions/core'
 import * as glob from '@actions/glob'
 import crypto from 'crypto'
 import { parse } from 'csv-parse/sync'
@@ -7,19 +6,23 @@ import path from 'path'
 
 import type { Subject } from '@actions/attest'
 
+const MAX_SUBJECT_COUNT = 2500
 const DIGEST_ALGORITHM = 'sha256'
 
+export type SubjectInputs = {
+  subjectPath: string
+  subjectName: string
+  subjectDigest: string
+  downcaseName?: boolean
+}
 // Returns the subject specified by the action's inputs. The subject may be
 // specified as a path to a file or as a digest. If a path is provided, the
 // file's digest is calculated and returned along with the subject's name. If a
 // digest is provided, the name must also be provided.
-export const subjectFromInputs = async (): Promise<Subject[]> => {
-  const subjectPath = core.getInput('subject-path', { required: false })
-  const subjectDigest = core.getInput('subject-digest', { required: false })
-  const subjectName = core.getInput('subject-name', { required: false })
-  const pushToRegistry = core.getBooleanInput('push-to-registry', {
-    required: false
-  })
+export const subjectFromInputs = async (
+  inputs: SubjectInputs
+): Promise<Subject[]> => {
+  const { subjectPath, subjectDigest, subjectName, downcaseName } = inputs
 
   if (!subjectPath && !subjectDigest) {
     throw new Error('One of subject-path or subject-digest must be provided')
@@ -37,7 +40,7 @@ export const subjectFromInputs = async (): Promise<Subject[]> => {
 
   // If push-to-registry is enabled, ensure the subject name is lowercase
   // to conform to OCI image naming conventions
-  const name = pushToRegistry ? subjectName.toLowerCase() : subjectName
+  const name = downcaseName ? subjectName.toLowerCase() : subjectName
 
   if (subjectPath) {
     return await getSubjectFromPath(subjectPath, name)
@@ -52,34 +55,41 @@ const getSubjectFromPath = async (
   subjectPath: string,
   subjectName?: string
 ): Promise<Subject[]> => {
-  const subjects: Subject[] = []
+  const digestedSubjects: Subject[] = []
+  const files: string[] = []
 
   // Parse the list of subject paths
   const subjectPaths = parseList(subjectPath)
 
+  // Expand the globbed paths to a list of files
   for (const subPath of subjectPaths) {
-    // Expand the globbed path to a list of files
     /* eslint-disable-next-line github/no-then */
-    const files = await glob.create(subPath).then(async g => g.glob())
-
-    for (const file of files) {
-      // Skip anything that is NOT a file
-      if (!fs.statSync(file).isFile()) {
-        continue
-      }
-
-      const name = subjectName || path.parse(file).base
-      const digest = await digestFile(DIGEST_ALGORITHM, file)
-
-      subjects.push({ name, digest: { [DIGEST_ALGORITHM]: digest } })
-    }
+    files.push(...(await glob.create(subPath).then(async g => g.glob())))
   }
 
-  if (subjects.length === 0) {
+  if (files.length > MAX_SUBJECT_COUNT) {
+    throw new Error(
+      `Too many subjects specified. The maximum number of subjects is ${MAX_SUBJECT_COUNT}.`
+    )
+  }
+
+  for (const file of files) {
+    // Skip anything that is NOT a file
+    if (!fs.statSync(file).isFile()) {
+      continue
+    }
+
+    const name = subjectName || path.parse(file).base
+    const digest = await digestFile(DIGEST_ALGORITHM, file)
+
+    digestedSubjects.push({ name, digest: { [DIGEST_ALGORITHM]: digest } })
+  }
+
+  if (digestedSubjects.length === 0) {
     throw new Error(`Could not find subject at path ${subjectPath}`)
   }
 
-  return Promise.all(subjects)
+  return digestedSubjects
 }
 
 // Returns the subject specified by the digest of a file. The digest is returned