testing

Signed-off-by: Brian DeHamer <[email protected]>

.eslintignore

@@ -0,0 +1,4 @@
+lib/
+dist/
+node_modules/
+coverage/

.github/linters/.eslintrc.yml

@@ -0,0 +1,85 @@
+env:
+  node: true
+  es6: true
+  jest: true
+
+globals:
+  Atomics: readonly
+  SharedArrayBuffer: readonly
+
+ignorePatterns:
+  - '!.*'
+  - '**/node_modules/.*'
+  - '**/dist/.*'
+  - '**/coverage/.*'
+  - '*.json'
+
+parser: '@typescript-eslint/parser'
+
+parserOptions:
+  ecmaVersion: 2023
+  sourceType: module
+  project:
+    - './.github/linters/tsconfig.json'
+    - './tsconfig.json'
+
+plugins:
+  - jest
+  - '@typescript-eslint'
+
+extends:
+  - eslint:recommended
+  - plugin:@typescript-eslint/eslint-recommended
+  - plugin:@typescript-eslint/recommended
+  - plugin:github/recommended
+  - plugin:jest/recommended
+
+rules:
+  {
+    'camelcase': 'off',
+    'eslint-comments/no-use': 'off',
+    'eslint-comments/no-unused-disable': 'off',
+    'i18n-text/no-en': 'off',
+    'import/no-namespace': 'off',
+    'import/no-unresolved':
+      ['error', { 'ignore': ['csv-parse/sync']}],
+    'no-console': 'off',
+    'no-unused-vars': 'off',
+    'prettier/prettier': 'error',
+    'semi': 'off',
+    '@typescript-eslint/array-type': 'error',
+    '@typescript-eslint/await-thenable': 'error',
+    '@typescript-eslint/ban-ts-comment': 'error',
+    '@typescript-eslint/consistent-type-assertions': 'error',
+    '@typescript-eslint/explicit-member-accessibility':
+      ['error', { 'accessibility': 'no-public' }],
+    '@typescript-eslint/explicit-function-return-type':
+      ['error', { 'allowExpressions': true }],
+    '@typescript-eslint/func-call-spacing': ['error', 'never'],
+    '@typescript-eslint/no-array-constructor': 'error',
+    '@typescript-eslint/no-empty-interface': 'error',
+    '@typescript-eslint/no-explicit-any': 'error',
+    '@typescript-eslint/no-extraneous-class': 'error',
+    '@typescript-eslint/no-for-in-array': 'error',
+    '@typescript-eslint/no-inferrable-types': 'error',
+    '@typescript-eslint/no-misused-new': 'error',
+    '@typescript-eslint/no-namespace': 'error',
+    '@typescript-eslint/no-non-null-assertion': 'warn',
+    '@typescript-eslint/no-require-imports': 'error',
+    '@typescript-eslint/no-unnecessary-qualifier': 'error',
+    '@typescript-eslint/no-unnecessary-type-assertion': 'error',
+    '@typescript-eslint/no-unused-vars': 'error',
+    '@typescript-eslint/no-useless-constructor': 'error',
+    '@typescript-eslint/no-var-requires': 'error',
+    '@typescript-eslint/prefer-for-of': 'warn',
+    '@typescript-eslint/prefer-function-type': 'warn',
+    '@typescript-eslint/prefer-includes': 'error',
+    '@typescript-eslint/prefer-string-starts-ends-with': 'error',
+    '@typescript-eslint/promise-function-async': 'error',
+    '@typescript-eslint/require-array-sort-compare': 'error',
+    '@typescript-eslint/restrict-plus-operands': 'error',
+    '@typescript-eslint/semi': ['error', 'never'],
+    '@typescript-eslint/space-before-function-paren': 'off',
+    '@typescript-eslint/type-annotation-spacing': 'error',
+    '@typescript-eslint/unbound-method': 'error'
+  }

.github/linters/eslint.config.mjs

@@ -1,93 +0,0 @@
-import eslint from '@eslint/js'
-import importplugin from 'eslint-plugin-import'
-import jestplugin from 'eslint-plugin-jest'
-import tseslint from 'typescript-eslint'
-
-export default tseslint.config(
-  // Ignore non-project files
-  {
-    name: 'ignore',
-    ignores: ['.github', 'dist', 'coverage', '**/*.json', 'jest.setup.js']
-  },
-  // Use recommended rules from ESLint, TypeScript, and other plugins
-  eslint.configs.recommended,
-  tseslint.configs.recommendedTypeChecked,
-  jestplugin.configs['flat/recommended'],
-  importplugin.flatConfigs.recommended,
-  importplugin.flatConfigs.typescript,
-  // Override some rules
-  {
-    name: 'project-settings',
-    languageOptions: {
-      ecmaVersion: 2023,
-      parserOptions: {
-        project: ['./.github/linters/tsconfig.json', './tsconfig.json']
-      }
-    },
-    rules: {
-      // eslint rules
-      eqeqeq: ['error', 'smart'],
-      'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
-      'no-console': 'off',
-      'no-implicit-globals': 'error',
-      'no-inner-declarations': 'error',
-      'no-invalid-this': 'error',
-      'no-return-assign': 'error',
-      'no-sequences': 'error',
-      'no-shadow': 'error',
-      'no-useless-concat': 'error',
-      'object-shorthand': ['error', 'always', { avoidQuotes: true }],
-      'one-var': ['error', 'never'],
-      'prefer-template': 'error',
-
-      // typescript-eslint rules
-      '@typescript-eslint/array-type': 'error',
-      '@typescript-eslint/consistent-type-assertions': 'error',
-      '@typescript-eslint/explicit-function-return-type': [
-        'error',
-        { allowExpressions: true }
-      ],
-      '@typescript-eslint/explicit-member-accessibility': [
-        'error',
-        { accessibility: 'no-public' }
-      ],
-      '@typescript-eslint/no-extraneous-class': 'error',
-      '@typescript-eslint/no-inferrable-types': 'error',
-      '@typescript-eslint/no-non-null-assertion': 'warn',
-      '@typescript-eslint/no-unnecessary-qualifier': 'error',
-      '@typescript-eslint/no-unsafe-argument': 'off',
-      '@typescript-eslint/no-unsafe-assignment': 'off',
-      '@typescript-eslint/no-useless-constructor': 'error',
-      '@typescript-eslint/prefer-for-of': 'warn',
-      '@typescript-eslint/prefer-function-type': 'warn',
-      '@typescript-eslint/prefer-includes': 'error',
-      '@typescript-eslint/prefer-string-starts-ends-with': 'error',
-      '@typescript-eslint/promise-function-async': 'error',
-      '@typescript-eslint/require-array-sort-compare': 'error',
-      '@typescript-eslint/restrict-template-expressions': 'off',
-
-      // eslint-plugin-import rules
-      'import/extensions': 'error',
-      'import/first': 'error',
-      'import/no-absolute-path': 'error',
-      'import/no-commonjs': 'error',
-      'import/no-deprecated': 'warn',
-      'import/no-dynamic-require': 'error',
-      'import/no-extraneous-dependencies': 'error',
-      'import/no-mutable-exports': 'error',
-      'import/no-namespace': 'off',
-      'import/no-unresolved': ['error', { ignore: ['csv-parse/sync'] }],
-      'import/no-anonymous-default-export': [
-        'error',
-        {
-          allowAnonymousClass: false,
-          allowAnonymousFunction: false,
-          allowArray: true,
-          allowArrowFunction: false,
-          allowLiteral: true,
-          allowObject: true
-        }
-      ]
-    }
-  }
-)

.github/workflows/linter.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Lint Codebase
         id: super-linter
-        uses: super-linter/super-linter/slim@v7.4.0
+        uses: super-linter/super-linter/slim@v6
         env:
           DEFAULT_BRANCH: main
           FILTER_REGEX_EXCLUDE: dist/**/*
@@ -47,8 +47,4 @@ jobs:
           VALIDATE_ALL_CODEBASE: true
           VALIDATE_JAVASCRIPT_STANDARD: false
           VALIDATE_TYPESCRIPT_STANDARD: false
-          VALIDATE_TYPESCRIPT_ES: false
           VALIDATE_JSCPD: false
-
-      - name: Run eslint
-        run: npm run lint:eslint

.github/workflows/publish-immutable-actions.yml

@@ -1,22 +0,0 @@
-name: 'Publish Immutable Action Version'
-
-on:
-  release:
-    types: [published]
-
-permissions: {}
-
-jobs:
-  publish:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      id-token: write
-      packages: write
-
-    steps:
-      - name: Checking out
-        uses: actions/checkout@v4
-      - name: Publish
-        id: publish
-        uses: actions/[email protected]

README.md

@@ -18,29 +18,12 @@ Once the attestation has been created and signed, it will be uploaded to the GH
 attestations API and associated with the repository from which the workflow was
 initiated.
 
-When an attestation is created, the attestation is stored on the local
-filesystem used by the runner. For each attestation created, the filesystem path
-will be appended to the file `${RUNNER_TEMP}/created_attestation_paths.txt`.
-This can be used to gather all attestations created by all jobs during a the
-workflow.
-
 Attestations can be verified using the [`attestation` command in the GitHub
 CLI][5].
 
 See [Using artifact attestations to establish provenance for builds][9] for more
 information on artifact attestations.
 
-<!-- prettier-ignore-start -->
-> [!NOTE]
-> Artifact attestations are available in public repositories for all
-> current GitHub plans.
->
-> To use artifact attestations in private or internal repositories, you must
-> be on a GitHub Enterprise Cloud plan.
->
-> Artifact attestations are NOT supported on GitHub Enterprise Server.
-<!-- prettier-ignore-end -->
-
 ## Usage
 
 Within the GitHub Actions workflow which builds some artifact you would like to
@@ -61,7 +44,7 @@ attest:
 1. Add the following to your workflow after your artifact has been built:
 
    ```yaml
-   - uses: actions/attest@v2
+   - uses: actions/attest@v1
      with:
        subject-path: '<PATH TO ARTIFACT>'
        predicate-type: '<PREDICATE URI>'
@@ -71,35 +54,30 @@ attest:
    The `subject-path` parameter should identify the artifact for which you want
    to generate an attestation. The `predicate-type` can be any of the the
    [vetted predicate types][3] or a custom value. The `predicate-path`
-   identifies a file containing the JSON-encoded predicate parameters.
+   identifies a file containg the JSON-encoded predicate parameters.
 
 ### Inputs
 
 See [action.yml](action.yml)
 
 ```yaml
-- uses: actions/attest@v2
+- uses: actions/attest@v1
   with:
     # Path to the artifact serving as the subject of the attestation. Must
-    # specify exactly one of "subject-path", "subject-digest", or
+    # specify exactly one of "subject-path" or "subject-digest". May contain
-    # "subject-checksums". May contain a glob pattern or list of paths
+    # a glob pattern or list of paths (total subject count cannot exceed 2500).
-    # (total subject count cannot exceed 1024).
     subject-path:
 
     # SHA256 digest of the subject for the attestation. Must be in the form
     # "sha256:hex_digest" (e.g. "sha256:abc123..."). Must specify exactly one
-    # of "subject-path", "subject-digest", or "subject-checksums".
+    # of "subject-path" or "subject-digest".
     subject-digest:
 
-    # Subject name as it should appear in the attestation. Required when
+    # Subject name as it should appear in the attestation. Required unless
-    # identifying the subject with the "subject-digest" input.
+    # "subject-path" is specified, in which case it will be inferred from the
+    # path.
     subject-name:
 
-    # Path to checksums file containing digest and name of subjects for
-    # attestation. Must specify exactly one of "subject-path", "subject-digest",
-    # or "subject-checksums".
-    subject-checksums:
-
     # URI identifying the type of the predicate.
     predicate-type:
 
@@ -132,23 +110,25 @@ See [action.yml](action.yml)
 <!-- markdownlint-disable MD013 -->
 
 | Name          | Description                                                    | Example                  |
-| ----------------- | -------------------------------------------------------------- | ------------------------------------------------ |
+| ------------- | -------------------------------------------------------------- | ------------------------ |
-| `attestation-id`  | GitHub ID for the attestation                                  | `123456`                                         |
+| `bundle-path` | Absolute path to the file containing the generated attestation | `/tmp/attestation.jsonl` |
-| `attestation-url` | URL for the attestation summary                                | `https://github.com/foo/bar/attestations/123456` |
-| `bundle-path`     | Absolute path to the file containing the generated attestation | `/tmp/attestation.json`                          |
 
 <!-- markdownlint-enable MD013 -->
 
 Attestations are saved in the JSON-serialized [Sigstore bundle][6] format.
 
-If multiple subjects are being attested at the same time, a single attestation
+If multiple subjects are being attested at the same time, each attestation will
-will be created with references to each of the supplied subjects.
+be written to the output file on a separate line (using the [JSON Lines][7]
+format).
 
 ## Attestation Limits
 
 ### Subject Limits
 
-No more than 1024 subjects can be attested at the same time.
+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
 
@@ -181,7 +161,7 @@ jobs:
       - name: Build artifact
         run: make my-app
       - name: Attest
-        uses: actions/attest@v2
+        uses: actions/attest@v1
         with:
           subject-path: '${{ github.workspace }}/my-app'
           predicate-type: 'https://example.com/predicate/v1'
@@ -190,11 +170,11 @@ jobs:
 
 ### Identify Multiple Subjects
 
-If you are generating multiple artifacts, you can attest all of them at the same
+If you are generating multiple artifacts, you can generate an attestation for
-time by using a wildcard in the `subject-path` input.
+each by using a wildcard in the `subject-path` input.
 
 ```yaml
-- uses: actions/attest@v2
+- uses: actions/attest@v1
   with:
     subject-path: 'dist/**/my-bin-*'
     predicate-type: 'https://example.com/predicate/v1'
@@ -208,56 +188,19 @@ Alternatively, you can explicitly list multiple subjects with either a comma or
 newline delimited list:
 
 ```yaml
-- uses: actions/attest@v2
+- uses: actions/attest@v1
   with:
     subject-path: 'dist/foo, dist/bar'
 ```
 
 ```yaml
-- uses: actions/attest@v2
+- uses: actions/attest@v1
   with:
     subject-path: |
       dist/foo
       dist/bar
 ```
 
-### Identify Subjects with Checksums File
-
-If you are using tools like
-[goreleaser](https://goreleaser.com/customization/checksum/) or
-[jreleaser](https://jreleaser.org/guide/latest/reference/checksum.html) which
-generate a checksums file you can identify the attestation subjects by passing
-the path of the checksums file to the `subject-checksums` input. Each of the
-artifacts identified in the checksums file will be listed as a subject for the
-attestation.
-
-```yaml
-- name: Calculate artifact digests
-  run: |
-    shasum -a 256 foo_0.0.1_* > subject.checksums.txt
-
-- uses: actions/attest@v2
-  with:
-    subject-checksums: subject.checksums.txt
-    predicate-type: 'https://example.com/predicate/v1'
-    predicate: '{}'
-```
-
-<!-- markdownlint-disable MD038 -->
-
-The file referenced by the `subject-checksums` input must conform to the same
-format used by the shasum tools. Each subject should be listed on a separate
-line including the hex-encoded digest (either SHA256 or SHA512), a space, a
-single character flag indicating either binary (`*`) or text (` `) input mode,
-and the filename.
-
-<!-- markdownlint-enable MD038 -->
-
-```text
-b569bf992b287f55d78bf8ee476497e9b7e9d2bf1c338860bfb905016218c740  foo_0.0.1_darwin_amd64
-a54fc515e616cac7fcf11a49d5c5ec9ec315948a5935c1e11dd610b834b14dde  foo_0.0.1_darwin_arm64
-```
-
 ### Container Image
 
 When working with container images you can invoke the action with the
@@ -308,7 +251,7 @@ jobs:
           push: true
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
       - name: Attest
-        uses: actions/attest@v2
+        uses: actions/attest@v1
         id: attest
         with:
           subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
@@ -326,6 +269,7 @@ jobs:
 [5]: https://cli.github.com/manual/gh_attestation_verify
 [6]:
   https://github.com/sigstore/protobuf-specs/blob/main/protos/sigstore_bundle.proto
+[7]: https://jsonlines.org/
 [8]: https://github.com/actions/toolkit/tree/main/packages/glob#patterns
 [9]:
   https://docs.github.com/en/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds

__tests__/index.test.ts

@@ -13,7 +13,7 @@ describe('index', () => {
   beforeEach(() => {
     getBooleanInputMock.mockImplementation(() => false)
   })
-  it('calls run when imported', () => {
+  it('calls run when imported', async () => {
     // eslint-disable-next-line @typescript-eslint/no-require-imports
     require('../src/index')
 

__tests__/main.test.ts

@@ -43,11 +43,11 @@ const defaultInputs: main.RunInputs = {
   subjectName: '',
   subjectDigest: '',
   subjectPath: '',
-  subjectChecksums: '',
   pushToRegistry: false,
   showSummary: true,
   githubToken: '',
-  privateSigning: false
+  privateSigning: false,
+  batchSize: 50
 }
 
 describe('action', () => {
@@ -139,9 +139,7 @@ describe('action', () => {
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).toHaveBeenCalledWith(
-        new Error(
+        new Error('One of subject-path or subject-digest must be provided')
-          'One of subject-path, subject-digest, or subject-checksums must be provided'
-        )
       )
     })
   })
@@ -200,17 +198,7 @@ describe('action', () => {
       expect(setOutputMock).toHaveBeenNthCalledWith(
         1,
         'bundle-path',
-        expect.stringMatching('attestation.json')
+        expect.stringMatching('attestation.jsonl')
-      )
-      expect(setOutputMock).toHaveBeenNthCalledWith(
-        2,
-        'attestation-id',
-        expect.stringMatching(attestationID)
-      )
-      expect(setOutputMock).toHaveBeenNthCalledWith(
-        3,
-        'attestation-url',
-        expect.stringContaining(`foo/bar/attestations/${attestationID}`)
       )
       expect(setFailedMock).not.toHaveBeenCalled()
     })
@@ -296,27 +284,21 @@ describe('action', () => {
       expect(setOutputMock).toHaveBeenNthCalledWith(
         1,
         'bundle-path',
-        expect.stringMatching('attestation.json')
+        expect.stringMatching('attestation.jsonl')
-      )
-      expect(setOutputMock).toHaveBeenNthCalledWith(
-        2,
-        'attestation-id',
-        expect.stringMatching(attestationID)
-      )
-      expect(setOutputMock).toHaveBeenNthCalledWith(
-        3,
-        'attestation-url',
-        expect.stringContaining(`foo/bar/attestations/${attestationID}`)
       )
       expect(setFailedMock).not.toHaveBeenCalled()
     })
   })
 
-  describe('when the subject count is greater than 1', () => {
+  describe('when the subject count exceeds the batch size', () => {
     let dir = ''
     const filename = 'subject'
+    let scope: nock.Scope
 
     beforeEach(async () => {
+      // Start from scratch
+      nock.cleanAll()
+
       const subjectCount = 5
       const content = 'file content'
 
@@ -327,13 +309,6 @@ describe('action', () => {
       // Add files for glob testing
       for (let i = 0; i < subjectCount; i++) {
         await fs.writeFile(path.join(dir, `${filename}-${i}`), content)
-      }
-
-      // Set the GH context with private repository visibility and a repo owner.
-      setGHContext({
-        payload: { repository: { visibility: 'private' } },
-        repo: { owner: 'foo', repo: 'bar' }
-      })
 
         // Set-up a Fulcio mock for each subject
         await mockFulcio({
@@ -343,6 +318,29 @@ describe('action', () => {
 
         // 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 () => {
@@ -356,7 +354,8 @@ describe('action', () => {
         subjectPath: path.join(dir, `${filename}-*`),
         predicateType,
         predicate,
-        githubToken: 'gh-token'
+        githubToken: 'gh-token',
+        batchSize: 2
       }
       await main.run(inputs)
 
@@ -364,8 +363,17 @@ describe('action', () => {
       expect(setFailedMock).not.toHaveBeenCalled()
       expect(infoMock).toHaveBeenNthCalledWith(
         1,
-        expect.stringMatching('Attestation created for 5 subjects')
+        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)
     })
   })
 
@@ -374,7 +382,7 @@ describe('action', () => {
     const filename = 'subject'
 
     beforeEach(async () => {
-      const subjectCount = 1025
+      const subjectCount = 2501
       const content = 'file content'
 
       // Set-up temp directory
@@ -411,7 +419,7 @@ describe('action', () => {
       expect(runMock).toHaveReturned()
       expect(setFailedMock).toHaveBeenCalledWith(
         new Error(
-          'Too many subjects specified. The maximum number of subjects is 1024.'
+          'Too many subjects specified. The maximum number of subjects is 2500.'
         )
       )
     })

__tests__/subject.test.ts

@@ -2,24 +2,19 @@ import crypto from 'crypto'
 import fs from 'fs/promises'
 import os from 'os'
 import path from 'path'
-import {
+import { subjectFromInputs, SubjectInputs } from '../src/subject'
-  formatSubjectDigest,
-  subjectFromInputs,
-  SubjectInputs
-} from '../src/subject'
 
 describe('subjectFromInputs', () => {
   const blankInputs: SubjectInputs = {
     subjectPath: '',
     subjectName: '',
-    subjectDigest: '',
+    subjectDigest: ''
-    subjectChecksums: ''
   }
 
   describe('when no inputs are provided', () => {
     it('throws an error', async () => {
       await expect(subjectFromInputs(blankInputs)).rejects.toThrow(
-        /one of subject-path, subject-digest, or subject-checksums must be provided/i
+        /one of subject-path or subject-digest must be provided/i
       )
     })
   })
@@ -29,42 +24,11 @@ describe('subjectFromInputs', () => {
       const inputs: SubjectInputs = {
         subjectName: 'foo',
         subjectPath: 'path/to/subject',
-        subjectDigest: 'digest',
+        subjectDigest: 'digest'
-        subjectChecksums: ''
       }
 
       await expect(subjectFromInputs(inputs)).rejects.toThrow(
-        /only one of subject-path, subject-digest, or subject-checksums may be provided/i
+        /only one of subject-path or subject-digest may be provided/i
-      )
-    })
-  })
-
-  describe('when both subject path and subject checksums are provided', () => {
-    it('throws an error', async () => {
-      const inputs: SubjectInputs = {
-        subjectName: '',
-        subjectPath: 'path/to/subject',
-        subjectDigest: '',
-        subjectChecksums: 'path/to/checksums'
-      }
-
-      await expect(subjectFromInputs(inputs)).rejects.toThrow(
-        /only one of subject-path, subject-digest, or subject-checksums may be provided/i
-      )
-    })
-  })
-
-  describe('when both subject digest and subject checksums are provided', () => {
-    it('throws an error', async () => {
-      const inputs: SubjectInputs = {
-        subjectName: 'foo',
-        subjectPath: '',
-        subjectDigest: 'digest',
-        subjectChecksums: 'path/to/checksums'
-      }
-
-      await expect(subjectFromInputs(inputs)).rejects.toThrow(
-        /only one of subject-path, subject-digest, or subject-checksums may be provided/i
       )
     })
   })
@@ -99,7 +63,7 @@ describe('subjectFromInputs', () => {
       })
     })
 
-    describe('when the algorithm is not supported', () => {
+    describe('when the alogrithm is not supported', () => {
       it('throws an error', async () => {
         const inputs: SubjectInputs = {
           ...blankInputs,
@@ -264,6 +228,7 @@ describe('subjectFromInputs', () => {
         expect(subjects).toBeDefined()
         expect(subjects).toHaveLength(3)
 
+        /* eslint-disable-next-line github/array-foreach */
         subjects.forEach((subject, i) => {
           expect(subject.name).toEqual(`${filename}-${i}`)
           expect(subject.digest).toEqual({ sha256: expectedDigest })
@@ -393,154 +358,5 @@ describe('subjectFromInputs', () => {
         })
       })
     })
-
-    describe('when duplicate subjects are supplied', () => {
-      let otherDir = ''
-
-      // Add duplicate subject in alternate directory
-      beforeEach(async () => {
-        // Set-up temp directory
-        const tmpDir = await fs.realpath(os.tmpdir())
-        otherDir = await fs.mkdtemp(tmpDir + path.sep)
-
-        // Write file to temp directory
-        await fs.writeFile(path.join(otherDir, filename), content)
-      })
-
-      it('returns de-duplicated subjects', async () => {
-        const inputs: SubjectInputs = {
-          ...blankInputs,
-          subjectPath: `${path.join(dir, 'subject')}, ${path.join(otherDir, 'subject')} `
-        }
-        const subjects = await subjectFromInputs(inputs)
-
-        expect(subjects).toBeDefined()
-        expect(subjects).toHaveLength(1)
-      })
-    })
-  })
-
-  describe('when specifying a subject checksums file', () => {
-    const checksums = `
-187dcd1506a170337415589ff00c8743f19d41cc31fca246c2739dfd450d0b9d  demo_0.0.1_linux_amd64
-badline
-5d8b4751ef31f9440d843fcfa4e53ca2e25b1cb1f13fd355fdc7c24b41fe645293291ea9297ba3989078abb77ebbaac66be073618a9e4974dbd0361881d4c718 demo_0.0.1_darwin_arm64`
-
-    let dir = ''
-    const filename = 'checksums'
-
-    beforeEach(async () => {
-      // Set-up temp directory
-      const tmpDir = await fs.realpath(os.tmpdir())
-      dir = await fs.mkdtemp(tmpDir + path.sep)
-
-      // Write file to temp directory
-      await fs.writeFile(path.join(dir, filename), checksums)
-    })
-
-    afterEach(async () => {
-      // Clean-up temp directory
-      await fs.rm(dir, { recursive: true })
-    })
-
-    describe('when the specified path is NOT a file', () => {
-      it('throws an error', async () => {
-        const inputs: SubjectInputs = {
-          ...blankInputs,
-          subjectChecksums: dir
-        }
-        await expect(subjectFromInputs(inputs)).rejects.toThrow(
-          /subject checksums file not found/i
-        )
-      })
-    })
-
-    describe('when the specific path is a file', () => {
-      it('returns the multiple subjects', async () => {
-        const inputs: SubjectInputs = {
-          ...blankInputs,
-          subjectChecksums: path.join(dir, filename)
-        }
-        const subjects = await subjectFromInputs(inputs)
-
-        expect(subjects).toBeDefined()
-        expect(subjects).toHaveLength(2)
-
-        expect(subjects).toContainEqual({
-          name: 'demo_0.0.1_linux_amd64',
-          digest: {
-            sha256:
-              '187dcd1506a170337415589ff00c8743f19d41cc31fca246c2739dfd450d0b9d'
-          }
-        })
-      })
-    })
-  })
-
-  describe('when specifying a subject checksums string', () => {
-    const checksums = `
-f861e68a080799ca83104630b56abb90d8dbcc5f8b5a8639cb691e269838f29e  demo_0.0.1_linux_386
-187dcd1506a170337415589ff00c8743f19d41cc31fca246c2739dfd450d0b9d  demo_0.0.1_linux_amd64
-9ecbf449e286a8a8748c161c52aa28b6b2fc64ab86f94161c5d1b3abc18156c5  demo_0.0.1_linux_arm64`
-
-    it('returns the multiple subjects', async () => {
-      const inputs: SubjectInputs = {
-        ...blankInputs,
-        subjectChecksums: checksums
-      }
-      const subjects = await subjectFromInputs(inputs)
-
-      expect(subjects).toBeDefined()
-      expect(subjects).toHaveLength(3)
-
-      expect(subjects).toContainEqual({
-        name: 'demo_0.0.1_linux_386',
-        digest: {
-          sha256:
-            'f861e68a080799ca83104630b56abb90d8dbcc5f8b5a8639cb691e269838f29e'
-        }
-      })
-    })
-  })
-
-  describe('when specifying a subject checksums string with an unrecognized digest', () => {
-    const checksums = `f861e  demo_0.0.1_linux_386`
-
-    it('throws an error', async () => {
-      const inputs: SubjectInputs = {
-        ...blankInputs,
-        subjectChecksums: checksums
-      }
-
-      await expect(subjectFromInputs(inputs)).rejects.toThrow(
-        /unknown digest algorithm/i
-      )
-    })
-  })
-
-  describe('when specifying a subject checksums string with an invalid digest', () => {
-    const checksums =
-      '!!!!e68a080799ca83104630b56abb90d8dbcc5f8b5a8639cb691e269838f29e  demo_0.0.1_linux_386'
-
-    it('throws an error', async () => {
-      const inputs: SubjectInputs = {
-        ...blankInputs,
-        subjectChecksums: checksums
-      }
-
-      await expect(subjectFromInputs(inputs)).rejects.toThrow(/invalid digest/i)
-    })
-  })
-})
-
-describe('subjectDigest', () => {
-  it('returns the digest', () => {
-    const subject = {
-      name: 'foo',
-      digest: { sha1: 'deadbeef' }
-    }
-
-    const digest = formatSubjectDigest(subject)
-    expect(digest).toEqual('sha1:deadbeef')
   })
 })

action.yml

@@ -9,26 +9,20 @@ inputs:
   subject-path:
     description: >
       Path to the artifact serving as the subject of the attestation. Must
-      specify exactly one of "subject-path",  "subject-digest", or
+      specify exactly one of "subject-path" or "subject-digest". May contain a
-      "subject-checksums". May contain a glob pattern or list of paths (total
+      glob pattern or list of paths (total subject count cannot exceed 2500).
-      subject count cannot exceed 1024).
     required: false
   subject-digest:
     description: >
       Digest of the subject for the attestation. Must be in the form
       "algorithm:hex_digest" (e.g. "sha256:abc123..."). Must specify exactly one
-      of "subject-path", "subject-digest", or "subject-checksums".
+      of "subject-path" or "subject-digest".
     required: false
   subject-name:
     description: >
-      Subject name as it should appear in the attestation. Required when
+      Subject name as it should appear in the attestation. Required unless
-      identifying the subject with the "subject-digest" input.
+      "subject-path" is specified, in which case it will be inferred from the
-    required: false
+      path.
-  subject-checksums:
-    description: >
-      Path to checksums file containing digest and name of subjects for
-      attestation. Must specify exactly one of "subject-path", "subject-digest",
-      or "subject-checksums".
     required: false
   predicate-type:
     description: >
@@ -66,11 +60,7 @@ inputs:
     required: false
 outputs:
   bundle-path:
-    description: 'The path to the file containing the attestation bundle.'
+    description: 'The path to the file containing the attestation bundle(s).'
-  attestation-id:
-    description: 'The ID of the attestation.'
-  attestation-url:
-    description: 'The URL for the attestation summary.'
 
 runs:
   using: node20

dist/606.index.js

@@ -1,287 +0,0 @@
-"use strict";
-exports.id = 606;
-exports.ids = [606];
-exports.modules = {
-
-/***/ 606:
-/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
-
-/* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "default": () => (/* binding */ pMap)
-/* harmony export */ });
-/* unused harmony exports pMapIterable, pMapSkip */
-async function pMap(
-	iterable,
-	mapper,
-	{
-		concurrency = Number.POSITIVE_INFINITY,
-		stopOnError = true,
-		signal,
-	} = {},
-) {
-	return new Promise((resolve, reject_) => {
-		if (iterable[Symbol.iterator] === undefined && iterable[Symbol.asyncIterator] === undefined) {
-			throw new TypeError(`Expected \`input\` to be either an \`Iterable\` or \`AsyncIterable\`, got (${typeof iterable})`);
-		}
-
-		if (typeof mapper !== 'function') {
-			throw new TypeError('Mapper function is required');
-		}
-
-		if (!((Number.isSafeInteger(concurrency) && concurrency >= 1) || concurrency === Number.POSITIVE_INFINITY)) {
-			throw new TypeError(`Expected \`concurrency\` to be an integer from 1 and up or \`Infinity\`, got \`${concurrency}\` (${typeof concurrency})`);
-		}
-
-		const result = [];
-		const errors = [];
-		const skippedIndexesMap = new Map();
-		let isRejected = false;
-		let isResolved = false;
-		let isIterableDone = false;
-		let resolvingCount = 0;
-		let currentIndex = 0;
-		const iterator = iterable[Symbol.iterator] === undefined ? iterable[Symbol.asyncIterator]() : iterable[Symbol.iterator]();
-
-		const reject = reason => {
-			isRejected = true;
-			isResolved = true;
-			reject_(reason);
-		};
-
-		if (signal) {
-			if (signal.aborted) {
-				reject(signal.reason);
-			}
-
-			signal.addEventListener('abort', () => {
-				reject(signal.reason);
-			});
-		}
-
-		const next = async () => {
-			if (isResolved) {
-				return;
-			}
-
-			const nextItem = await iterator.next();
-
-			const index = currentIndex;
-			currentIndex++;
-
-			// Note: `iterator.next()` can be called many times in parallel.
-			// This can cause multiple calls to this `next()` function to
-			// receive a `nextItem` with `done === true`.
-			// The shutdown logic that rejects/resolves must be protected
-			// so it runs only one time as the `skippedIndex` logic is
-			// non-idempotent.
-			if (nextItem.done) {
-				isIterableDone = true;
-
-				if (resolvingCount === 0 && !isResolved) {
-					if (!stopOnError && errors.length > 0) {
-						reject(new AggregateError(errors)); // eslint-disable-line unicorn/error-message
-						return;
-					}
-
-					isResolved = true;
-
-					if (skippedIndexesMap.size === 0) {
-						resolve(result);
-						return;
-					}
-
-					const pureResult = [];
-
-					// Support multiple `pMapSkip`'s.
-					for (const [index, value] of result.entries()) {
-						if (skippedIndexesMap.get(index) === pMapSkip) {
-							continue;
-						}
-
-						pureResult.push(value);
-					}
-
-					resolve(pureResult);
-				}
-
-				return;
-			}
-
-			resolvingCount++;
-
-			// Intentionally detached
-			(async () => {
-				try {
-					const element = await nextItem.value;
-
-					if (isResolved) {
-						return;
-					}
-
-					const value = await mapper(element, index);
-
-					// Use Map to stage the index of the element.
-					if (value === pMapSkip) {
-						skippedIndexesMap.set(index, value);
-					}
-
-					result[index] = value;
-
-					resolvingCount--;
-					await next();
-				} catch (error) {
-					if (stopOnError) {
-						reject(error);
-					} else {
-						errors.push(error);
-						resolvingCount--;
-
-						// In that case we can't really continue regardless of `stopOnError` state
-						// since an iterable is likely to continue throwing after it throws once.
-						// If we continue calling `next()` indefinitely we will likely end up
-						// in an infinite loop of failed iteration.
-						try {
-							await next();
-						} catch (error) {
-							reject(error);
-						}
-					}
-				}
-			})();
-		};
-
-		// Create the concurrent runners in a detached (non-awaited)
-		// promise. We need this so we can await the `next()` calls
-		// to stop creating runners before hitting the concurrency limit
-		// if the iterable has already been marked as done.
-		// NOTE: We *must* do this for async iterators otherwise we'll spin up
-		// infinite `next()` calls by default and never start the event loop.
-		(async () => {
-			for (let index = 0; index < concurrency; index++) {
-				try {
-					// eslint-disable-next-line no-await-in-loop
-					await next();
-				} catch (error) {
-					reject(error);
-					break;
-				}
-
-				if (isIterableDone || isRejected) {
-					break;
-				}
-			}
-		})();
-	});
-}
-
-function pMapIterable(
-	iterable,
-	mapper,
-	{
-		concurrency = Number.POSITIVE_INFINITY,
-		backpressure = concurrency,
-	} = {},
-) {
-	if (iterable[Symbol.iterator] === undefined && iterable[Symbol.asyncIterator] === undefined) {
-		throw new TypeError(`Expected \`input\` to be either an \`Iterable\` or \`AsyncIterable\`, got (${typeof iterable})`);
-	}
-
-	if (typeof mapper !== 'function') {
-		throw new TypeError('Mapper function is required');
-	}
-
-	if (!((Number.isSafeInteger(concurrency) && concurrency >= 1) || concurrency === Number.POSITIVE_INFINITY)) {
-		throw new TypeError(`Expected \`concurrency\` to be an integer from 1 and up or \`Infinity\`, got \`${concurrency}\` (${typeof concurrency})`);
-	}
-
-	if (!((Number.isSafeInteger(backpressure) && backpressure >= concurrency) || backpressure === Number.POSITIVE_INFINITY)) {
-		throw new TypeError(`Expected \`backpressure\` to be an integer from \`concurrency\` (${concurrency}) and up or \`Infinity\`, got \`${backpressure}\` (${typeof backpressure})`);
-	}
-
-	return {
-		async * [Symbol.asyncIterator]() {
-			const iterator = iterable[Symbol.asyncIterator] === undefined ? iterable[Symbol.iterator]() : iterable[Symbol.asyncIterator]();
-
-			const promises = [];
-			let runningMappersCount = 0;
-			let isDone = false;
-			let index = 0;
-
-			function trySpawn() {
-				if (isDone || !(runningMappersCount < concurrency && promises.length < backpressure)) {
-					return;
-				}
-
-				const promise = (async () => {
-					const {done, value} = await iterator.next();
-
-					if (done) {
-						return {done: true};
-					}
-
-					runningMappersCount++;
-
-					// Spawn if still below concurrency and backpressure limit
-					trySpawn();
-
-					try {
-						const returnValue = await mapper(await value, index++);
-
-						runningMappersCount--;
-
-						if (returnValue === pMapSkip) {
-							const index = promises.indexOf(promise);
-
-							if (index > 0) {
-								promises.splice(index, 1);
-							}
-						}
-
-						// Spawn if still below backpressure limit and just dropped below concurrency limit
-						trySpawn();
-
-						return {done: false, value: returnValue};
-					} catch (error) {
-						isDone = true;
-						return {error};
-					}
-				})();
-
-				promises.push(promise);
-			}
-
-			trySpawn();
-
-			while (promises.length > 0) {
-				const {error, done, value} = await promises[0]; // eslint-disable-line no-await-in-loop
-
-				promises.shift();
-
-				if (error) {
-					throw error;
-				}
-
-				if (done) {
-					return;
-				}
-
-				// Spawn if just dropped below backpressure limit and below the concurrency limit
-				trySpawn();
-
-				if (value === pMapSkip) {
-					continue;
-				}
-
-				yield value;
-			}
-		},
-	};
-}
-
-const pMapSkip = Symbol('skip');
-
-
-/***/ })
-
-};
-;

package.json

@@ -1,7 +1,7 @@
 {
   "name": "actions/attest",
   "description": "Generate signed attestations for workflow artifacts",
-  "version": "2.4.0",
+  "version": "1.4.0",
   "author": "",
   "private": true,
   "homepage": "https://github.com/actions/attest",
@@ -27,7 +27,7 @@
     "ci-test": "jest",
     "format:write": "prettier --write **/*.ts",
     "format:check": "prettier --check **/*.ts",
-    "lint:eslint": "npx eslint . -c ./.github/linters/eslint.config.mjs",
+    "lint:eslint": "npx eslint . -c ./.github/linters/.eslintrc.yml",
     "lint:markdown": "npx markdownlint --config .github/linters/.markdown-lint.yml \"*.md\"",
     "lint": "npm run lint:eslint && npm run lint:markdown",
     "package": "ncc build src/index.ts --license licenses.txt",
@@ -69,31 +69,33 @@
     ]
   },
   "dependencies": {
-    "@actions/attest": "^1.6.0",
+    "@actions/attest": "^1.3.1",
-    "@actions/core": "^1.11.1",
+    "@actions/core": "^1.10.1",
-    "@actions/github": "^6.0.1",
+    "@actions/glob": "^0.4.0",
-    "@actions/glob": "^0.5.0",
+    "@sigstore/oci": "^0.3.7",
-    "@sigstore/oci": "^0.5.0",
+    "csv-parse": "^5.5.6"
-    "csv-parse": "^5.6.0"
   },
   "devDependencies": {
-    "@eslint/js": "^9.28.0",
+    "@sigstore/mock": "^0.7.5",
-    "@sigstore/mock": "^0.10.0",
+    "@types/jest": "^29.5.12",
-    "@types/jest": "^29.5.14",
     "@types/make-fetch-happen": "^10.0.4",
-    "@types/node": "^22.15.30",
+    "@types/node": "^22.2.0",
-    "@vercel/ncc": "^0.38.3",
+    "@typescript-eslint/eslint-plugin": "^7.18.0",
-    "eslint": "^9.28.0",
+    "@typescript-eslint/parser": "^7.18.0",
-    "eslint-plugin-import": "^2.31.0",
+    "@vercel/ncc": "^0.38.1",
-    "eslint-plugin-jest": "^28.13.0",
+    "eslint": "^8.57.0",
+    "eslint-plugin-github": "^5.0.1",
+    "eslint-plugin-jest": "^28.8.0",
+    "eslint-plugin-jsonc": "^2.16.0",
+    "eslint-plugin-prettier": "^5.2.1",
     "jest": "^29.7.0",
     "js-yaml": "^4.1.0",
-    "markdownlint-cli": "^0.45.0",
+    "markdownlint-cli": "^0.41.0",
-    "nock": "^13.5.6",
+    "nock": "^13.5.4",
-    "prettier": "^3.5.3",
+    "prettier": "^3.3.3",
-    "ts-jest": "^29.3.4",
+    "prettier-eslint": "^16.3.0",
-    "typescript": "^5.8.3",
+    "ts-jest": "^29.2.4",
-    "typescript-eslint": "^8.34.0",
+    "typescript": "^5.5.4",
-    "undici": "^5.29.0"
+    "undici": "^5.28.4"
   }
 }

src/attest.ts

@@ -1,17 +1,18 @@
 import { Attestation, Predicate, Subject, attest } from '@actions/attest'
 import { attachArtifactToImage, getRegistryCredentials } from '@sigstore/oci'
-import { formatSubjectDigest } from './subject'
 
 const OCI_TIMEOUT = 30000
 const OCI_RETRY = 3
 
 export type SigstoreInstance = 'public-good' | 'github'
 export type AttestResult = Attestation & {
+  subjectName: string
+  subjectDigest: string
   attestationDigest?: string
 }
 
 export const createAttestation = async (
-  subjects: Subject[],
+  subject: Subject,
   predicate: Predicate,
   opts: {
     sigstoreInstance: SigstoreInstance
@@ -21,22 +22,27 @@ export const createAttestation = async (
 ): Promise<AttestResult> => {
   // Sign provenance w/ Sigstore
   const attestation = await attest({
-    subjects,
+    subjectName: subject.name,
+    subjectDigest: subject.digest,
     predicateType: predicate.type,
     predicate: predicate.params,
     sigstore: opts.sigstoreInstance,
     token: opts.githubToken
   })
 
-  const result: AttestResult = attestation
+  const subDigest = subjectDigest(subject)
+  const result: AttestResult = {
+    ...attestation,
+    subjectName: subject.name,
+    subjectDigest: subDigest
+  }
 
-  if (subjects.length === 1 && opts.pushToRegistry) {
+  if (opts.pushToRegistry) {
-    const subject = subjects[0]
     const credentials = getRegistryCredentials(subject.name)
     const artifact = await attachArtifactToImage({
       credentials,
       imageName: subject.name,
-      imageDigest: formatSubjectDigest(subject),
+      imageDigest: subDigest,
       artifact: Buffer.from(JSON.stringify(attestation.bundle)),
       mediaType: attestation.bundle.mediaType,
       annotations: {
@@ -52,3 +58,10 @@ export const createAttestation = async (
 
   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

@@ -4,11 +4,12 @@
 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'),
-  subjectChecksums: core.getInput('subject-checksums'),
   predicateType: core.getInput('predicate-type'),
   predicate: core.getInput('predicate'),
   predicatePath: core.getInput('predicate-path'),
@@ -18,8 +19,10 @@ const inputs: RunInputs = {
   // 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 */
+// eslint-disable-next-line @typescript-eslint/no-floating-promises
 run(inputs)

src/main.ts

@@ -7,16 +7,11 @@ import { AttestResult, SigstoreInstance, createAttestation } from './attest'
 import { SEARCH_PUBLIC_GOOD_URL } from './endpoints'
 import { PredicateInputs, predicateFromInputs } from './predicate'
 import * as style from './style'
-import {
+import { SubjectInputs, subjectFromInputs } from './subject'
-  SubjectInputs,
-  formatSubjectDigest,
-  subjectFromInputs
-} from './subject'
 
-import type { Subject } from '@actions/attest'
+const ATTESTATION_FILE_NAME = 'attestation.jsonl'
-
+const DELAY_INTERVAL_MS = 75
-const ATTESTATION_FILE_NAME = 'attestation.json'
+const DELAY_MAX_MS = 1200
-const ATTESTATION_PATHS_FILE_NAME = 'created_attestation_paths.txt'
 
 export type RunInputs = SubjectInputs &
   PredicateInputs & {
@@ -24,6 +19,7 @@ export type RunInputs = SubjectInputs &
     githubToken: string
     showSummary: boolean
     privateSigning: boolean
+    batchSize: number
   }
 
 /* istanbul ignore next */
@@ -51,6 +47,7 @@ export async function run(inputs: RunInputs): Promise<void> {
       : 'github'
 
   try {
+    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.'
@@ -66,41 +63,42 @@ export async function run(inputs: RunInputs): Promise<void> {
     const outputPath = path.join(tempDir(), ATTESTATION_FILE_NAME)
     core.setOutput('bundle-path', outputPath)
 
-    const att = await createAttestation(subjects, predicate, {
+    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(subjects, att, sigstoreInstance)
+        logAttestation(att, sigstoreInstance)
 
         // Write attestation bundle to output file
         fs.writeFileSync(outputPath, JSON.stringify(att.bundle) + os.EOL, {
           encoding: 'utf-8',
           flag: 'a'
         })
-
-    const baseDir = process.env.RUNNER_TEMP
-    if (baseDir) {
-      const outputSummaryPath = path.join(baseDir, ATTESTATION_PATHS_FILE_NAME)
-      // Append the output path to the attestations paths file
-      fs.appendFileSync(outputSummaryPath, outputPath + os.EOL, {
-        encoding: 'utf-8',
-        flag: 'a'
-      })
-    } else {
-      core.warning(
-        'RUNNER_TEMP environment variable is not set. Cannot write attestation paths file.'
-      )
       }
-
-    if (att.attestationID) {
-      core.setOutput('attestation-id', att.attestationID)
-      core.setOutput('attestation-url', attestationURL(att.attestationID))
     }
 
     if (inputs.showSummary) {
-      await logSummary(att)
+      logSummary(atts)
     }
   } catch (err) {
     // Fail the workflow run if an error occurs
@@ -125,17 +123,12 @@ export async function run(inputs: RunInputs): Promise<void> {
 
 // Log details about the attestation to the GitHub Actions run
 const logAttestation = (
-  subjects: Subject[],
   attestation: AttestResult,
   sigstoreInstance: SigstoreInstance
 ): void => {
-  if (subjects.length === 1) {
   core.info(
-      `Attestation created for ${subjects[0].name}@${formatSubjectDigest(subjects[0])}`
+    `Attestation created for ${attestation.subjectName}@${attestation.subjectDigest}`
   )
-  } else {
-    core.info(`Attestation created for ${subjects.length} subjects`)
-  }
 
   const instanceName =
     sigstoreInstance === 'public-good' ? 'Public Good' : 'GitHub'
@@ -163,19 +156,30 @@ const logAttestation = (
 
   if (attestation.attestationDigest) {
     core.info(style.highlight('Attestation uploaded to registry'))
-    core.info(`${subjects[0].name}@${attestation.attestationDigest}`)
+    core.info(`${attestation.subjectName}@${attestation.attestationDigest}`)
   }
 }
 
 // Attach summary information to the GitHub Actions run
-const logSummary = async (attestation: AttestResult): Promise<void> => {
+const logSummary = (attestations: AttestResult[]): void => {
-  const { attestationID } = attestation
+  if (attestations.length > 0) {
+    core.summary.addHeading(
+      /* istanbul ignore next */
+      attestations.length > 1 ? 'Attestations Created' : 'Attestation Created',
+      3
+    )
 
+    const listItems = []
+    for (const { subjectName, subjectDigest, attestationID } of attestations) {
       if (attestationID) {
-    const url = attestationURL(attestationID)
+        listItems.push(
-    core.summary.addHeading('Attestation Created', 3)
+          `<a href="${attestationURL(attestationID)}">${subjectName}@${subjectDigest}</a>`
-    core.summary.addList([`<a href="${url}">${url}</a>`])
+        )
-    await core.summary.write()
+      }
+    }
+
+    core.summary.addList(listItems)
+    core.summary.write()
   }
 }
 
@@ -190,5 +194,18 @@ const tempDir = (): string => {
   return fs.mkdtempSync(path.join(basePath, path.sep))
 }
 
+// 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/subject.ts

@@ -1,23 +1,18 @@
 import * as glob from '@actions/glob'
-import assert from 'assert'
 import crypto from 'crypto'
 import { parse } from 'csv-parse/sync'
 import fs from 'fs'
-import os from 'os'
 import path from 'path'
 
 import type { Subject } from '@actions/attest'
 
-const MAX_SUBJECT_COUNT = 1024
+const MAX_SUBJECT_COUNT = 2500
-const MAX_SUBJECT_CHECKSUM_SIZE_BYTES = 512 * MAX_SUBJECT_COUNT
 const DIGEST_ALGORITHM = 'sha256'
-const HEX_STRING_RE = /^[0-9a-fA-F]+$/
 
 export type SubjectInputs = {
   subjectPath: string
   subjectName: string
   subjectDigest: string
-  subjectChecksums: string
   downcaseName?: boolean
 }
 // Returns the subject specified by the action's inputs. The subject may be
@@ -27,26 +22,15 @@ export type SubjectInputs = {
 export const subjectFromInputs = async (
   inputs: SubjectInputs
 ): Promise<Subject[]> => {
-  const {
+  const { subjectPath, subjectDigest, subjectName, downcaseName } = inputs
-    subjectPath,
-    subjectDigest,
-    subjectName,
-    subjectChecksums,
-    downcaseName
-  } = inputs
 
-  const enabledInputs = [subjectPath, subjectDigest, subjectChecksums].filter(
+  if (!subjectPath && !subjectDigest) {
-    Boolean
+    throw new Error('One of subject-path or subject-digest must be provided')
-  )
-  if (enabledInputs.length === 0) {
-    throw new Error(
-      'One of subject-path, subject-digest, or subject-checksums must be provided'
-    )
   }
 
-  if (enabledInputs.length > 1) {
+  if (subjectPath && subjectDigest) {
     throw new Error(
-      'Only one of subject-path, subject-digest, or subject-checksums may be provided'
+      'Only one of subject-path or subject-digest may be provided'
     )
   }
 
@@ -58,27 +42,13 @@ export const subjectFromInputs = async (
   // to conform to OCI image naming conventions
   const name = downcaseName ? subjectName.toLowerCase() : subjectName
 
-  switch (true) {
+  if (subjectPath) {
-    case !!subjectPath:
+    return await getSubjectFromPath(subjectPath, name)
-      return getSubjectFromPath(subjectPath, name)
+  } else {
-    case !!subjectDigest:
     return [getSubjectFromDigest(subjectDigest, name)]
-    case !!subjectChecksums:
-      return getSubjectFromChecksums(subjectChecksums)
-    /* istanbul ignore next */
-    default:
-      // This should be unreachable, but TS requires a default case
-      assert.fail('unreachable')
   }
 }
 
-// Returns the subject's digest as a formatted string of the form
-// "<algorithm>:<digest>".
-export const formatSubjectDigest = (subject: Subject): string => {
-  const alg = Object.keys(subject.digest).sort()[0]
-  return `${alg}:${subject.digest[alg]}`
-}
-
 // 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 (
@@ -88,13 +58,11 @@ const getSubjectFromPath = async (
   const digestedSubjects: Subject[] = []
 
   // Parse the list of subject paths
-  const subjectPaths = parseSubjectPathList(subjectPath).join('\n')
+  const subjectPaths = parseList(subjectPath).join('\n')
 
-  // Expand the globbed paths to a list of actual paths
+  // Expand the globbed paths to a list of files
-  const paths = await glob.create(subjectPaths).then(async g => g.glob())
+  /* eslint-disable-next-line github/no-then */
-
+  const files = await glob.create(subjectPaths).then(async g => g.glob())
-  // Filter path list to just the files (not directories)
-  const files = paths.filter(p => fs.statSync(p).isFile())
 
   if (files.length > MAX_SUBJECT_COUNT) {
     throw new Error(
@@ -103,18 +71,16 @@ const getSubjectFromPath = async (
   }
 
   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)
 
-    // Only add the subject if it is not already in the list
-    if (
-      !digestedSubjects.some(
-        s => s.name === name && s.digest[DIGEST_ALGORITHM] === digest
-      )
-    ) {
     digestedSubjects.push({ name, digest: { [DIGEST_ALGORITHM]: digest } })
   }
-  }
 
   if (digestedSubjects.length === 0) {
     throw new Error(`Could not find subject at path ${subjectPath}`)
@@ -142,62 +108,6 @@ const getSubjectFromDigest = (
   }
 }
 
-const getSubjectFromChecksums = (subjectChecksums: string): Subject[] => {
-  if (fs.existsSync(subjectChecksums)) {
-    return getSubjectFromChecksumsFile(subjectChecksums)
-  } else {
-    return getSubjectFromChecksumsString(subjectChecksums)
-  }
-}
-
-const getSubjectFromChecksumsFile = (checksumsPath: string): Subject[] => {
-  const stats = fs.statSync(checksumsPath)
-  if (!stats.isFile()) {
-    throw new Error(`subject checksums file not found: ${checksumsPath}`)
-  }
-
-  /* istanbul ignore next */
-  if (stats.size > MAX_SUBJECT_CHECKSUM_SIZE_BYTES) {
-    throw new Error(
-      `subject checksums file exceeds maximum allowed size: ${MAX_SUBJECT_CHECKSUM_SIZE_BYTES} bytes`
-    )
-  }
-
-  const checksums = fs.readFileSync(checksumsPath, 'utf-8')
-  return getSubjectFromChecksumsString(checksums)
-}
-
-const getSubjectFromChecksumsString = (checksums: string): Subject[] => {
-  const subjects: Subject[] = []
-
-  const records: string[] = checksums.split(os.EOL).filter(Boolean)
-
-  for (const record of records) {
-    // Find the space delimiter following the digest
-    const delimIndex = record.indexOf(' ')
-
-    // Skip any line that doesn't have a delimiter
-    if (delimIndex === -1) {
-      continue
-    }
-
-    // Swallow the type identifier character at the beginning of the name
-    const name = record.slice(delimIndex + 2)
-    const digest = record.slice(0, delimIndex)
-
-    if (!HEX_STRING_RE.test(digest)) {
-      throw new Error(`Invalid digest: ${digest}`)
-    }
-
-    subjects.push({
-      name,
-      digest: { [digestAlgorithm(digest)]: digest }
-    })
-  }
-
-  return subjects
-}
-
 // Calculates the digest of a file using the specified algorithm. The file is
 // streamed into the digest function to avoid loading the entire file into
 // memory. The returned digest is a hex string.
@@ -214,7 +124,7 @@ const digestFile = async (
   })
 }
 
-const parseSubjectPathList = (input: string): string[] => {
+const parseList = (input: string): string[] => {
   const res: string[] = []
 
   const records: string[][] = parse(input, {
@@ -230,14 +140,3 @@ const parseSubjectPathList = (input: string): string[] => {
 
   return res.filter(item => item).map(pat => pat.trim())
 }
-
-const digestAlgorithm = (digest: string): string => {
-  switch (digest.length) {
-    case 64:
-      return 'sha256'
-    case 128:
-      return 'sha512'
-    default:
-      throw new Error(`Unknown digest algorithm: ${digest}`)
-  }
-}