Fix the max comment length issue

__tests__/fixtures/config-allow-sample.yml

@@ -1,4 +1,4 @@
 fail_on_severity: critical
 allow_licenses:
-  - "BSD"
-  - "GPL 2"
+  - 'BSD'
+  - 'GPL 2'

__tests__/fixtures/inline-license-config-sample.yml

@@ -1 +1 @@
-allow-licenses: "MIT, GPL-2.0-only"
+allow-licenses: 'MIT, GPL-2.0-only'

__tests__/summary.test.ts

@@ -1,5 +1,5 @@
 import {expect, jest, test} from '@jest/globals'
-import {Changes, ConfigurationOptions, Scorecard} from '../src/schemas'
+import {Change, Changes, ConfigurationOptions, Scorecard} from '../src/schemas'
 import * as summary from '../src/summary'
 import * as core from '@actions/core'
 import {createTestChange} from './fixtures/create-test-change'
@@ -109,6 +109,42 @@ test('prints headline as h1', () => {
   expect(text).toContain('<h1>Dependency Review</h1>')
 })
 
+test('returns minimal summary in case the core.summary is too large for a PR comment', () => {
+  let changes: Changes = [
+    createTestChange({name: 'lodash', version: '1.2.3'}),
+    createTestChange({name: 'colors', version: '2.3.4'}),
+    createTestChange({name: '@foo/bar', version: '*'})
+  ]
+
+  let minSummary: string = summary.addSummaryToSummary(
+    changes,
+    emptyInvalidLicenseChanges,
+    emptyChanges,
+    scorecard,
+    defaultConfig
+  )
+
+  // side effect DR report into core.summary as happens in main.ts
+  summary.addScannedDependencies(changes)
+  const text = core.summary.stringify()
+
+  expect(text).toContain('<h1>Dependency Review</h1>')
+  expect(minSummary).toContain('# Dependency Review')
+
+  expect(text).toContain('❌ 3 vulnerable package(s)')
+  expect(text).not.toContain('* ❌ 3 vulnerable package(s)')
+  expect(text).toContain('lodash')
+  expect(text).toContain('colors')
+  expect(text).toContain('@foo/bar')
+
+  expect(minSummary).toContain('* ❌ 3 vulnerable package(s)')
+  expect(minSummary).not.toContain('lodash')
+  expect(minSummary).not.toContain('colors')
+  expect(minSummary).not.toContain('@foo/bar')
+
+  expect(text.length).toBeGreaterThan(minSummary.length)
+})
+
 test('only includes "No vulnerabilities or license issues found"-message if both are configured and nothing was found', () => {
   summary.addSummaryToSummary(
     emptyChanges,

src/comment-pr.ts

@@ -5,6 +5,8 @@ import * as retry from '@octokit/plugin-retry'
 import {RequestError} from '@octokit/request-error'
 import {ConfigurationOptions} from './schemas'
 
+export const MAX_COMMENT_LENGTH = 65536
+
 const retryingOctokit = githubUtils.GitHub.plugin(retry.retry)
 const octo = new retryingOctokit(
   githubUtils.getOctokitOptions(core.getInput('repo-token', {required: true}))
@@ -14,13 +16,9 @@ const octo = new retryingOctokit(
 const COMMENT_MARKER = '<!-- dependency-review-pr-comment-marker -->'
 
 export async function commentPr(
-  summary: typeof core.summary,
+  commentContent: string,
   config: ConfigurationOptions
 ): Promise<void> {
-  const commentContent = summary.stringify()
-
-  core.setOutput('comment-content', commentContent)
-
   if (
     !(
       config.comment_summary_in_pr === 'always' ||

src/main.ts

@@ -22,7 +22,7 @@ import * as summary from './summary'
 import {getRefs} from './git-refs'
 
 import {groupDependenciesByManifest} from './utils'
-import {commentPr} from './comment-pr'
+import {commentPr, MAX_COMMENT_LENGTH} from './comment-pr'
 import {getDeniedChanges} from './deny'
 
 async function delay(ms: number): Promise<void> {
@@ -127,7 +127,7 @@ async function run(): Promise<void> {
 
     const scorecard = await getScorecardLevels(filteredChanges)
 
-    summary.addSummaryToSummary(
+    const minSummary = summary.addSummaryToSummary(
       vulnerableChanges,
       invalidLicenseChanges,
       deniedChanges,
@@ -166,7 +166,21 @@ async function run(): Promise<void> {
     core.setOutput('dependency-changes', JSON.stringify(changes))
     summary.addScannedDependencies(changes)
     printScannedDependencies(changes)
-    await commentPr(core.summary, config)
+
+    // include full summary in output; Actions will truncate if oversized
+    let rendered = core.summary.stringify()
+    core.setOutput('content-comment', rendered)
+
+    // if the summary is oversized, replace with minimal version
+    if (rendered.length >= MAX_COMMENT_LENGTH) {
+      core.debug(
+        'The comment was too big for the GitHub API. Falling back on a minimum comment'
+      )
+      rendered = minSummary
+    }
+
+    // update the PR comment if needed with the right-sized summary
+    await commentPr(rendered, config)
   } catch (error) {
     if (error instanceof RequestError && error.status === 404) {
       core.setFailed(

src/summary.ts

@@ -10,17 +10,23 @@ const icons = {
   warning: '⚠️'
 }
 
+// generates the DR report summmary and caches it to the Action's core.summary.
+// returns the DR summary string, ready to be posted as a PR comment if the
+// final DR report is too large
 export function addSummaryToSummary(
   vulnerableChanges: Changes,
   invalidLicenseChanges: InvalidLicenseChanges,
   deniedChanges: Changes,
   scorecard: Scorecard,
   config: ConfigurationOptions
-): void {
+): string {
+  const out: string[] = []
+
   const scorecardWarnings = countScorecardWarnings(scorecard, config)
   const licenseIssues = countLicenseIssues(invalidLicenseChanges)
 
   core.summary.addHeading('Dependency Review', 1)
+  out.push('# Dependency Review')
 
   if (
     vulnerableChanges.length === 0 &&
@@ -33,54 +39,69 @@ export function addSummaryToSummary(
       config.license_check ? 'license issues' : '',
       config.show_openssf_scorecard ? 'OpenSSF Scorecard issues' : ''
     ]
+
+    let msg = ''
     if (issueTypes.filter(Boolean).length === 0) {
-      core.summary.addRaw(`${icons.check} No issues found.`)
+      msg = `${icons.check} No issues found.`
     } else {
-      core.summary.addRaw(
-        `${icons.check} No ${issueTypes.filter(Boolean).join(' or ')} found.`
-      )
+      msg = `${icons.check} No ${issueTypes.filter(Boolean).join(' or ')} found.`
     }
 
-    return
+    core.summary.addRaw(msg)
+    out.push(msg)
+    return out.join('\n')
   }
 
-  core.summary
-    .addRaw('The following issues were found:')
-    .addList([
-      ...(config.vulnerability_check
-        ? [
-            `${checkOrFailIcon(vulnerableChanges.length)} ${
-              vulnerableChanges.length
-            } vulnerable package(s)`
-          ]
-        : []),
-      ...(config.license_check
-        ? [
-            `${checkOrFailIcon(invalidLicenseChanges.forbidden.length)} ${
-              invalidLicenseChanges.forbidden.length
-            } package(s) with incompatible licenses`,
-            `${checkOrFailIcon(invalidLicenseChanges.unresolved.length)} ${
-              invalidLicenseChanges.unresolved.length
-            } package(s) with invalid SPDX license definitions`,
-            `${checkOrWarnIcon(invalidLicenseChanges.unlicensed.length)} ${
-              invalidLicenseChanges.unlicensed.length
-            } package(s) with unknown licenses.`
-          ]
-        : []),
-      ...(deniedChanges.length > 0
-        ? [
-            `${checkOrFailIcon(deniedChanges.length)} ${
-              deniedChanges.length
-            } package(s) denied.`
-          ]
-        : []),
-      ...(config.show_openssf_scorecard && scorecardWarnings > 0
-        ? [
-            `${checkOrWarnIcon(scorecardWarnings)} ${scorecardWarnings ? scorecardWarnings : 'No'} packages with OpenSSF Scorecard issues.`
-          ]
-        : [])
-    ])
-    .addRaw('See the Details below.')
+  const foundIssuesHeader = 'The following issues were found:'
+  core.summary.addRaw(foundIssuesHeader)
+  out.push(foundIssuesHeader)
+
+  const summaryList: string[] = [
+    ...(config.vulnerability_check
+      ? [
+          `${checkOrFailIcon(vulnerableChanges.length)} ${
+            vulnerableChanges.length
+          } vulnerable package(s)`
+        ]
+      : []),
+    ...(config.license_check
+      ? [
+          `${checkOrFailIcon(invalidLicenseChanges.forbidden.length)} ${
+            invalidLicenseChanges.forbidden.length
+          } package(s) with incompatible licenses`,
+          `${checkOrFailIcon(invalidLicenseChanges.unresolved.length)} ${
+            invalidLicenseChanges.unresolved.length
+          } package(s) with invalid SPDX license definitions`,
+          `${checkOrWarnIcon(invalidLicenseChanges.unlicensed.length)} ${
+            invalidLicenseChanges.unlicensed.length
+          } package(s) with unknown licenses.`
+        ]
+      : []),
+    ...(deniedChanges.length > 0
+      ? [
+          `${checkOrWarnIcon(deniedChanges.length)} ${
+            deniedChanges.length
+          } package(s) denied.`
+        ]
+      : []),
+    ...(config.show_openssf_scorecard && scorecardWarnings > 0
+      ? [
+          `${checkOrWarnIcon(scorecardWarnings)} ${scorecardWarnings ? scorecardWarnings : 'No'} packages with OpenSSF Scorecard issues.`
+        ]
+      : [])
+  ]
+
+  core.summary.addList(summaryList)
+  for (const line of summaryList) {
+    out.push(`* ${line}`)
+  }
+
+  core.summary.addRaw('See the Details below.')
+  out.push(
+    `\n[View full job summary](${process.env.GITHUB_SERVER_URL}/${process.env.GITHUB_REPOSITORY}/actions/runs/${process.env.GITHUB_RUN_ID})`
+  )
+
+  return out.join('\n')
 }
 
 function countScorecardWarnings(