Adds option to write summary into a pr comment

README.md

@@ -67,7 +67,7 @@ jobs:
 Configure this action by either inlining these options in your workflow file, or by using an external configuration file. All configuration options are optional.
 
 | Option                  | Usage                                                                                                                                                                             | Possible values                                                              | Default value |
-|-----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------|---------------|
+| ----------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------- | ------------- |
 | `fail-on-severity`      | Defines the threshold for the level of severity. The action will fail on any pull requests that introduce vulnerabilities of the specified severity level or higher.              | `low`, `moderate`, `high`, `critical`                                        | `low`         |
 | `allow-licenses`*       | Contains a list of allowed licenses. The action will fail on pull requests that introduce dependencies with licenses that do not match the list.                                  | Any [SPDX-compliant identifier(s)](https://spdx.org/licenses/)               | none          |
 | `deny-licenses`*        | Contains a list of prohibited licenses. The action will fail on pull requests that introduce dependencies with licenses that match the list.                                      | Any [SPDX-compliant identifier(s)](https://spdx.org/licenses/)               | none          |
@@ -76,12 +76,12 @@ Configure this action by either inlining these options in your workflow file, or
 | `license-check`         | Enable or disable the license check performed by the action.                                                                                                                      | `true`, `false`                                                              | `true`        |
 | `vulnerability-check`   | Enable or disable the vulnerability check performed by the action.                                                                                                                | `true`, `false`                                                              | `true`        |
 | `base-ref`/`head-ref`   | Provide custom git references for the git base/head when performing the comparison check. This is only used for event types other than `pull_request` and `pull_request_target`.  | Any valid git ref(s) in your project                                         | none          |
+| `comment-summary-in-pr` | Enable or disable reporting the review summary as a comment in the pull request. If enabled, you must give the workflow or job permission `pull-requests: write`.                 | `true`, `false`                                                              | `false`       |
 
 *not supported for use with GitHub Enterprise Server
 
 †will be supported with GitHub Enterprise Server 3.8
 
-
 ### Inline Configuration
 
 You can pass options to the Dependency Review GitHub Action using your workflow file.
@@ -113,7 +113,7 @@ jobs:
 You can use an external configuration file to specify the settings for this action. It can be a local file or a file in an external repository. Refer to the following options for the specification.
 
 | Option                | Usage                                                                                                                                                                                                                                                     | Possible values                                                                                                                      |
-|-----------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------|
+| --------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
 | `config-file`         | A path to a file in the current repository or an external repository. Use this syntax for external files: `OWNER/REPOSITORY/FILENAME@BRANCH`                                                                                                              | **Local file**: `./.github/dependency-review-config.yml` <br> **External repo**: `github/octorepo/dependency-review-config.yml@main` |
 | `external-repo-token` | Specifies a token for fetching the configuration file. It is required if the file resides in a private external repository and for all GitHub Enterprise Server repositories. Create a token in [developer settings](https://github.com/settings/tokens). | Any token with `read` permissions to the repository hosting the config file.                                                         |
 

__tests__/config.test.ts

@@ -22,7 +22,8 @@ function clearInputs() {
     'VULNERABILITY-CHECK',
     'CONFIG-FILE',
     'BASE-REF',
-    'HEAD-REF'
+    'HEAD-REF',
+    'COMMENT-SUMMARY-IN-PR'
   ]
 
   allowedOptions.forEach(option => {

action.yml

@@ -41,6 +41,9 @@ inputs:
   vulnerability-check:
     description: A boolean to determine if vulnerability checks should be performed
     required: false
+  comment-summary-in-pr:
+    description: A boolean to determine if the report should be posted as a comment in the PR itself. Setting this to true requires you to give the workflow the write permissions for pull-requests
+    required: false
 runs:
   using: 'node16'
   main: 'dist/index.js'

src/comment-pr.ts

@@ -0,0 +1,84 @@
+import * as github from '@actions/github'
+import * as core from '@actions/core'
+import * as githubUtils from '@actions/github/lib/utils'
+import * as retry from '@octokit/plugin-retry'
+import {RequestError} from '@octokit/request-error'
+
+const retryingOctokit = githubUtils.GitHub.plugin(retry.retry)
+const octo = new retryingOctokit(
+  githubUtils.getOctokitOptions(core.getInput('repo-token', {required: true}))
+)
+
+// Comment Marker to identify an existing comment to update, so we don't spam the PR with comments
+const COMMENT_MARKER = '<!-- dependency-review-pr-comment-marker -->'
+
+export async function commentPr(summary: typeof core.summary): Promise<void> {
+  if (!github.context.payload.pull_request) {
+    core.warning(
+      'Not in the context of a pull request. Skipping comment creation.'
+    )
+    return
+  }
+
+  const commentBody = `${summary.stringify()}\n\n${COMMENT_MARKER}`
+
+  try {
+    const existingCommentId = await findCommentByMarker(COMMENT_MARKER)
+
+    if (existingCommentId) {
+      await octo.rest.issues.updateComment({
+        owner: github.context.repo.owner,
+        repo: github.context.repo.repo,
+        comment_id: existingCommentId,
+        body: commentBody
+      })
+    } else {
+      await octo.rest.issues.createComment({
+        owner: github.context.repo.owner,
+        repo: github.context.repo.repo,
+        issue_number: github.context.payload.pull_request.number,
+        body: commentBody
+      })
+    }
+  } catch (error) {
+    if (error instanceof RequestError && error.status === 403) {
+      core.warning(
+        `Unable to write summary to pull-request. Make sure you are giving this workflow the permission 'pull-requests: write'.`
+      )
+    } else {
+      if (error instanceof Error) {
+        core.warning(
+          `Unable to comment summary to pull-request, received error: ${error.message}`
+        )
+      } else {
+        core.warning(
+          'Unable to comment summary to pull-request: Unexpected fatal error'
+        )
+      }
+    }
+  }
+}
+
+async function findCommentByMarker(
+  commentBodyIncludes: string
+): Promise<number | undefined> {
+  const commentsIterator = octo.paginate.iterator(
+    octo.rest.issues.listComments,
+    {
+      owner: github.context.repo.owner,
+      repo: github.context.repo.repo,
+      // We are already checking if we are in the context of a pull request in the caller
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      issue_number: github.context.payload.pull_request!.number
+    }
+  )
+
+  for await (const {data: comments} of commentsIterator) {
+    const existingComment = comments.find(comment =>
+      comment.body?.includes(commentBodyIncludes)
+    )
+    if (existingComment) return existingComment.id
+  }
+
+  return undefined
+}

src/config.ts

@@ -34,6 +34,7 @@ function readInlineConfig(): ConfigurationOptionsPartial {
   const vulnerability_check = getOptionalBoolean('vulnerability-check')
   const base_ref = getOptionalInput('base-ref')
   const head_ref = getOptionalInput('head-ref')
+  const comment_summary_in_pr = getOptionalBoolean('comment-summary-in-pr')
 
   validateLicenses('allow-licenses', allow_licenses)
   validateLicenses('deny-licenses', deny_licenses)
@@ -47,7 +48,8 @@ function readInlineConfig(): ConfigurationOptionsPartial {
     license_check,
     vulnerability_check,
     base_ref,
-    head_ref
+    head_ref,
+    comment_summary_in_pr
   }
 
   return Object.fromEntries(

src/main.ts

@@ -15,6 +15,7 @@ import * as summary from './summary'
 import {getRefs} from './git-refs'
 
 import {groupDependenciesByManifest} from './utils'
+import {commentPr} from './comment-pr'
 
 async function run(): Promise<void> {
   try {
@@ -69,6 +70,9 @@ async function run(): Promise<void> {
 
     summary.addScannedDependencies(changes)
     printScannedDependencies(changes)
+    if (config.comment_summary_in_pr) {
+      await commentPr(core.summary)
+    }
   } catch (error) {
     if (error instanceof RequestError && error.status === 404) {
       core.setFailed(

src/schemas.ts

@@ -45,7 +45,8 @@ export const ConfigurationOptionsSchema = z
     vulnerability_check: z.boolean().default(true),
     config_file: z.string().optional(),
     base_ref: z.string().optional(),
-    head_ref: z.string().optional()
+    head_ref: z.string().optional(),
+    comment_summary_in_pr: z.boolean().default(false)
   })
   .superRefine((config, context) => {
     if (config.allow_licenses && config.deny_licenses) {