improved checksum parsing (#280)

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

.eslintignore

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

.github/linters/.eslintrc.yml

@@ -1,84 +0,0 @@
-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/.yaml-lint.yml

@@ -1,10 +0,0 @@
-rules:
-  document-end: disable
-  document-start:
-    level: warning
-    present: false
-  line-length:
-    level: warning
-    max: 80
-    allow-non-breakable-words: true
-    allow-non-breakable-inline-mappings: true

.github/linters/tsconfig.json

@@ -1,9 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "extends": "../../tsconfig.json",
-  "compilerOptions": {
-    "noEmit": true
-  },
-  "include": ["../../__tests__/**/*", "../../src/**/*"],
-  "exclude": ["../../dist", "../../node_modules", "../../coverage", "*.json"]
-}

.github/workflows/check-dist.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - name: Checkout
         id: checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Node.js
         id: setup-node

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - name: Checkout
         id: checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
       - name: Setup Node.js
         id: setup-node
@@ -58,7 +58,7 @@ jobs:
     steps:
       - name: Checkout
         id: checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: Calculate subject digest
         id: subject
         env:

.github/workflows/codeql-analysis.yml

@@ -32,7 +32,7 @@ jobs:
     steps:
       - name: Checkout
         id: checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Initialize CodeQL
         id: initialize

.github/workflows/linter.yml

@@ -1,50 +0,0 @@
-name: Lint Codebase
-
-on:
-  pull_request:
-    branches:
-      - main
-  push:
-    branches:
-      - main
-
-permissions:
-  contents: read
-  packages: read
-  statuses: write
-
-jobs:
-  lint:
-    name: Lint Codebase
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        id: checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Setup Node.js
-        id: setup-node
-        uses: actions/setup-node@v4
-        with:
-          node-version-file: .node-version
-          cache: npm
-
-      - name: Install Dependencies
-        id: install
-        run: npm ci
-
-      - name: Lint Codebase
-        id: super-linter
-        uses: super-linter/super-linter/slim@v7
-        env:
-          DEFAULT_BRANCH: main
-          FILTER_REGEX_EXCLUDE: dist/**/*
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          TYPESCRIPT_DEFAULT_STYLE: prettier
-          VALIDATE_ALL_CODEBASE: true
-          VALIDATE_JAVASCRIPT_STANDARD: false
-          VALIDATE_TYPESCRIPT_STANDARD: false
-          VALIDATE_JSCPD: false

.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/publish-immutable-action@v0.0.4

.node-version

@@ -1 +1 @@
-20.6.0
+24.5.0

README.md

@@ -18,12 +18,29 @@ 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
@@ -44,7 +61,7 @@ attest:
 1. Add the following to your workflow after your artifact has been built:
 
    ```yaml
-   - uses: actions/attest@v1
+   - uses: actions/attest@v2
      with:
        subject-path: '<PATH TO ARTIFACT>'
        predicate-type: '<PREDICATE URI>'
@@ -54,30 +71,35 @@ 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 containg the JSON-encoded predicate parameters.
+   identifies a file containing the JSON-encoded predicate parameters.
 
 ### Inputs
 
 See [action.yml](action.yml)
 
 ```yaml
-- uses: actions/attest@v1
+- uses: actions/attest@v2
   with:
     # Path to the artifact serving as the subject of the attestation. Must
-    # specify exactly one of "subject-path" or "subject-digest". May contain
+    # specify exactly one of "subject-path", "subject-digest", or
-    # a glob pattern or list of paths (total subject count cannot exceed 1024).
+    # "subject-checksums". May contain a glob pattern or list of paths
+    # (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" or "subject-digest".
+    # of "subject-path", "subject-digest", or "subject-checksums".
     subject-digest:
 
-    # Subject name as it should appear in the attestation. Required unless
+    # Subject name as it should appear in the attestation. Required when
-    # "subject-path" is specified, in which case it will be inferred from the
+    # identifying the subject with the "subject-digest" input.
-    # 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:
 
@@ -109,9 +131,11 @@ See [action.yml](action.yml)
 
 <!-- markdownlint-disable MD013 -->
 
-| Name          | Description                                                    | Example                 |
+| Name              | Description                                                    | Example                                          |
-| ------------- | -------------------------------------------------------------- | ----------------------- |
+| ----------------- | -------------------------------------------------------------- | ------------------------------------------------ |
-| `bundle-path` | Absolute path to the file containing the generated attestation | `/tmp/attestation.json` |
+| `attestation-id`  | GitHub ID for the attestation                                  | `123456`                                         |
+| `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 -->
 
@@ -157,7 +181,7 @@ jobs:
       - name: Build artifact
         run: make my-app
       - name: Attest
-        uses: actions/attest@v1
+        uses: actions/attest@v2
         with:
           subject-path: '${{ github.workspace }}/my-app'
           predicate-type: 'https://example.com/predicate/v1'
@@ -170,7 +194,7 @@ If you are generating multiple artifacts, you can attest all of them at the same
 time by using a wildcard in the `subject-path` input.
 
 ```yaml
-- uses: actions/attest@v1
+- uses: actions/attest@v2
   with:
     subject-path: 'dist/**/my-bin-*'
     predicate-type: 'https://example.com/predicate/v1'
@@ -184,19 +208,56 @@ Alternatively, you can explicitly list multiple subjects with either a comma or
 newline delimited list:
 
 ```yaml
-- uses: actions/attest@v1
+- uses: actions/attest@v2
   with:
     subject-path: 'dist/foo, dist/bar'
 ```
 
 ```yaml
-- uses: actions/attest@v1
+- uses: actions/attest@v2
   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
@@ -247,7 +308,7 @@ jobs:
           push: true
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
       - name: Attest
-        uses: actions/attest@v1
+        uses: actions/attest@v2
         id: attest
         with:
           subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

__tests__/index.test.ts

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

__tests__/main.test.ts

@@ -43,6 +43,7 @@ const defaultInputs: main.RunInputs = {
   subjectName: '',
   subjectDigest: '',
   subjectPath: '',
+  subjectChecksums: '',
   pushToRegistry: false,
   showSummary: true,
   githubToken: '',
@@ -138,7 +139,9 @@ describe('action', () => {
 
       expect(runMock).toHaveReturned()
       expect(setFailedMock).toHaveBeenCalledWith(
-        new Error('One of subject-path or subject-digest must be provided')
+        new Error(
+          'One of subject-path, subject-digest, or subject-checksums must be provided'
+        )
       )
     })
   })
@@ -199,6 +202,16 @@ describe('action', () => {
         'bundle-path',
         expect.stringMatching('attestation.json')
       )
+      expect(setOutputMock).toHaveBeenNthCalledWith(
+        2,
+        'attestation-id',
+        expect.stringMatching(attestationID)
+      )
+      expect(setOutputMock).toHaveBeenNthCalledWith(
+        3,
+        'attestation-url',
+        expect.stringContaining(`foo/bar/attestations/${attestationID}`)
+      )
       expect(setFailedMock).not.toHaveBeenCalled()
     })
   })
@@ -285,6 +298,16 @@ describe('action', () => {
         'bundle-path',
         expect.stringMatching('attestation.json')
       )
+      expect(setOutputMock).toHaveBeenNthCalledWith(
+        2,
+        'attestation-id',
+        expect.stringMatching(attestationID)
+      )
+      expect(setOutputMock).toHaveBeenNthCalledWith(
+        3,
+        'attestation-url',
+        expect.stringContaining(`foo/bar/attestations/${attestationID}`)
+      )
       expect(setFailedMock).not.toHaveBeenCalled()
     })
   })

__tests__/subject.test.ts

@@ -12,13 +12,14 @@ 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 or subject-digest must be provided/i
+        /one of subject-path, subject-digest, or subject-checksums must be provided/i
       )
     })
   })
@@ -28,11 +29,42 @@ 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 or subject-digest may be provided/i
+        /only one of subject-path, subject-digest, or subject-checksums 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
       )
     })
   })
@@ -67,7 +99,7 @@ describe('subjectFromInputs', () => {
       })
     })
 
-    describe('when the alogrithm is not supported', () => {
+    describe('when the algorithm is not supported', () => {
       it('throws an error', async () => {
         const inputs: SubjectInputs = {
           ...blankInputs,
@@ -232,7 +264,6 @@ 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 })
@@ -388,6 +419,139 @@ describe('subjectFromInputs', () => {
       })
     })
   })
+
+  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'
+          }
+        })
+        expect(subjects).toContainEqual({
+          name: 'demo_0.0.1_darwin_arm64',
+          digest: {
+            sha512:
+              '5d8b4751ef31f9440d843fcfa4e53ca2e25b1cb1f13fd355fdc7c24b41fe645293291ea9297ba3989078abb77ebbaac66be073618a9e4974dbd0361881d4c718'
+          }
+        })
+      })
+    })
+  })
+
+  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'
+        }
+      })
+      expect(subjects).toContainEqual({
+        name: 'demo_0.0.1_linux_amd64',
+        digest: {
+          sha256:
+            '187dcd1506a170337415589ff00c8743f19d41cc31fca246c2739dfd450d0b9d'
+        }
+      })
+      expect(subjects).toContainEqual({
+        name: 'demo_0.0.1_linux_arm64',
+        digest: {
+          sha256:
+            '9ecbf449e286a8a8748c161c52aa28b6b2fc64ab86f94161c5d1b3abc18156c5'
+        }
+      })
+    })
+  })
+
+  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', () => {

action.yml

@@ -9,20 +9,26 @@ inputs:
   subject-path:
     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
+      specify exactly one of "subject-path",  "subject-digest", or
-      glob pattern or list of paths (total subject count cannot exceed 1024).
+      "subject-checksums". May contain a glob pattern or list of paths (total
+      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" or "subject-digest".
+      of "subject-path", "subject-digest", or "subject-checksums".
     required: false
   subject-name:
     description: >
-      Subject name as it should appear in the attestation. Required unless
+      Subject name as it should appear in the attestation. Required when
-      "subject-path" is specified, in which case it will be inferred from the
+      identifying the subject with the "subject-digest" input.
-      path.
+    required: false
+  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: >
@@ -61,7 +67,11 @@ inputs:
 outputs:
   bundle-path:
     description: 'The path to the file containing the attestation bundle.'
+  attestation-id:
+    description: 'The ID of the attestation.'
+  attestation-url:
+    description: 'The URL for the attestation summary.'
 
 runs:
-  using: node20
+  using: node24
   main: ./dist/index.js

eslint.config.mjs

@@ -0,0 +1,94 @@
+import eslint from '@eslint/js'
+import importplugin from 'eslint-plugin-import'
+import jestplugin from 'eslint-plugin-jest'
+import path from 'node:path'
+import tseslint from 'typescript-eslint'
+
+export default tseslint.config(
+  // Ignore non-project files
+  {
+    name: 'ignore',
+    ignores: ['.github', 'dist', 'coverage', '**/*.json', 'jest.setup.js', 'eslint.config.mjs']
+  },
+  // 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: [ './tsconfig.lint.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
+        }
+      ]
+    }
+  }
+)

package.json

@@ -1,7 +1,7 @@
 {
   "name": "actions/attest",
   "description": "Generate signed attestations for workflow artifacts",
-  "version": "2.0.1",
+  "version": "3.0.0",
   "author": "",
   "private": true,
   "homepage": "https://github.com/actions/attest",
@@ -20,15 +20,15 @@
     ".": "./dist/index.js"
   },
   "engines": {
-    "node": ">=20"
+    "node": ">=24"
   },
   "scripts": {
     "bundle": "npm run format:write && npm run package",
     "ci-test": "jest",
     "format:write": "prettier --write **/*.ts",
     "format:check": "prettier --check **/*.ts",
-    "lint:eslint": "npx eslint . -c ./.github/linters/.eslintrc.yml",
+    "lint:eslint": "npx eslint",
-    "lint:markdown": "npx markdownlint --config .github/linters/.markdown-lint.yml \"*.md\"",
+    "lint:markdown": "npx markdownlint --config .markdown-lint.yml \"*.md\"",
     "lint": "npm run lint:eslint && npm run lint:markdown",
     "package": "ncc build src/index.ts --license licenses.txt",
     "package:watch": "npm run package -- --watch",
@@ -69,33 +69,31 @@
     ]
   },
   "dependencies": {
-    "@actions/attest": "^1.5.0",
+    "@actions/attest": "^1.6.0",
     "@actions/core": "^1.11.1",
+    "@actions/github": "^6.0.1",
     "@actions/glob": "^0.5.0",
-    "@sigstore/oci": "^0.4.0",
+    "@sigstore/oci": "^0.6.0",
     "csv-parse": "^5.6.0"
   },
   "devDependencies": {
-    "@sigstore/mock": "^0.8.0",
+    "@eslint/js": "^9.34.0",
-    "@types/jest": "^29.5.14",
+    "@sigstore/mock": "^0.11.0",
+    "@types/jest": "^30.0.0",
     "@types/make-fetch-happen": "^10.0.4",
-    "@types/node": "^22.9.4",
+    "@types/node": "^24.3.0",
-    "@typescript-eslint/eslint-plugin": "^7.18.0",
-    "@typescript-eslint/parser": "^7.18.0",
     "@vercel/ncc": "^0.38.3",
-    "eslint": "^8.57.1",
+    "eslint": "^9.34.0",
-    "eslint-plugin-github": "^5.1.2",
+    "eslint-plugin-import": "^2.32.0",
-    "eslint-plugin-jest": "^28.9.0",
+    "eslint-plugin-jest": "^29.0.1",
-    "eslint-plugin-jsonc": "^2.18.2",
+    "jest": "^30.0.5",
-    "eslint-plugin-prettier": "^5.2.1",
-    "jest": "^29.7.0",
     "js-yaml": "^4.1.0",
-    "markdownlint-cli": "^0.43.0",
+    "markdownlint-cli": "^0.45.0",
     "nock": "^13.5.6",
-    "prettier": "^3.3.3",
+    "prettier": "^3.6.2",
-    "prettier-eslint": "^16.3.0",
+    "ts-jest": "^29.4.1",
-    "ts-jest": "^29.2.5",
+    "typescript": "^5.9.2",
-    "typescript": "^5.7.2",
+    "typescript-eslint": "^8.41.0",
-    "undici": "^5.28.4"
+    "undici": "^5.29.0"
   }
 }

src/index.ts

@@ -8,6 +8,7 @@ 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'),
@@ -20,5 +21,5 @@ const inputs: RunInputs = {
   )
 }
 
-// eslint-disable-next-line @typescript-eslint/no-floating-promises
+/* eslint-disable-next-line @typescript-eslint/no-floating-promises */
 run(inputs)

src/main.ts

@@ -16,6 +16,7 @@ import {
 import type { Subject } from '@actions/attest'
 
 const ATTESTATION_FILE_NAME = 'attestation.json'
+const ATTESTATION_PATHS_FILE_NAME = 'created_attestation_paths.txt'
 
 export type RunInputs = SubjectInputs &
   PredicateInputs & {
@@ -79,8 +80,30 @@ export async function run(inputs: RunInputs): Promise<void> {
       flag: 'a'
     })
 
+    const baseDir = process.env.RUNNER_TEMP
+    /* istanbul ignore else */
+    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.'
+      )
+    }
+
+    /* istanbul ignore else */
+    if (att.attestationID) {
+      core.setOutput('attestation-id', att.attestationID)
+      core.setOutput('attestation-url', attestationURL(att.attestationID))
+    }
+
+    /* istanbul ignore else */
     if (inputs.showSummary) {
-      logSummary(att)
+      await logSummary(att)
     }
   } catch (err) {
     // Fail the workflow run if an error occurs
@@ -136,6 +159,7 @@ const logAttestation = (
     core.info(`${SEARCH_PUBLIC_GOOD_URL}?logIndex=${attestation.tlogID}`)
   }
 
+  /* istanbul ignore else */
   if (attestation.attestationID) {
     core.info(style.highlight('Attestation uploaded to repository'))
     core.info(attestationURL(attestation.attestationID))
@@ -148,14 +172,15 @@ const logAttestation = (
 }
 
 // Attach summary information to the GitHub Actions run
-const logSummary = (attestation: AttestResult): void => {
+const logSummary = async (attestation: AttestResult): Promise<void> => {
   const { attestationID } = attestation
 
+  /* istanbul ignore else */
   if (attestationID) {
     const url = attestationURL(attestationID)
     core.summary.addHeading('Attestation Created', 3)
     core.summary.addList([`<a href="${url}">${url}</a>`])
-    core.summary.write()
+    await core.summary.write()
   }
 }
 

src/subject.ts

@@ -1,18 +1,23 @@
 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_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
@@ -22,15 +27,26 @@ export type SubjectInputs = {
 export const subjectFromInputs = async (
   inputs: SubjectInputs
 ): Promise<Subject[]> => {
-  const { subjectPath, subjectDigest, subjectName, downcaseName } = inputs
+  const {
+    subjectPath,
+    subjectDigest,
+    subjectName,
+    subjectChecksums,
+    downcaseName
+  } = inputs
 
-  if (!subjectPath && !subjectDigest) {
+  const enabledInputs = [subjectPath, subjectDigest, subjectChecksums].filter(
-    throw new Error('One of subject-path or subject-digest must be provided')
+    Boolean
+  )
+  if (enabledInputs.length === 0) {
+    throw new Error(
+      'One of subject-path, subject-digest, or subject-checksums must be provided'
+    )
   }
 
-  if (subjectPath && subjectDigest) {
+  if (enabledInputs.length > 1) {
     throw new Error(
-      'Only one of subject-path or subject-digest may be provided'
+      'Only one of subject-path, subject-digest, or subject-checksums may be provided'
     )
   }
 
@@ -42,10 +58,17 @@ export const subjectFromInputs = async (
   // to conform to OCI image naming conventions
   const name = downcaseName ? subjectName.toLowerCase() : subjectName
 
-  if (subjectPath) {
+  switch (true) {
-    return await getSubjectFromPath(subjectPath, name)
+    case !!subjectPath:
-  } else {
+      return getSubjectFromPath(subjectPath, name)
-    return [getSubjectFromDigest(subjectDigest, name)]
+    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')
   }
 }
 
@@ -65,10 +88,9 @@ const getSubjectFromPath = async (
   const digestedSubjects: Subject[] = []
 
   // Parse the list of subject paths
-  const subjectPaths = parseList(subjectPath).join('\n')
+  const subjectPaths = parseSubjectPathList(subjectPath).join('\n')
 
   // Expand the globbed paths to a list of actual paths
-  /* eslint-disable-next-line github/no-then */
   const paths = await glob.create(subjectPaths).then(async g => g.glob())
 
   // Filter path list to just the files (not directories)
@@ -120,6 +142,68 @@ 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
+    }
+
+    // It's common for checksum records to have a leading flag character before
+    // the artifact name. It will be either a '*' or a space.
+    const flag_and_name = record.slice(delimIndex + 1)
+    const name =
+      flag_and_name.startsWith('*') || flag_and_name.startsWith(' ')
+        ? flag_and_name.slice(1)
+        : flag_and_name
+
+    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.
@@ -136,7 +220,7 @@ const digestFile = async (
   })
 }
 
-const parseList = (input: string): string[] => {
+const parseSubjectPathList = (input: string): string[] => {
   const res: string[] = []
 
   const records: string[][] = parse(input, {
@@ -152,3 +236,14 @@ const parseList = (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}`)
+  }
+}

tsconfig.json

@@ -5,6 +5,7 @@
     "module": "NodeNext",
     "rootDir": "./src",
     "moduleResolution": "NodeNext",
+    "isolatedModules": true,
     "baseUrl": "./",
     "sourceMap": true,
     "outDir": "./dist",

tsconfig.lint.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true
+  },
+  "include": ["./__tests__/**/*", "./src/**/*"],
+  "exclude": ["./dist", "./node_modules", "./coverage", "*.json"]
+}