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const { sigstore } = require('sigstore')
const INTOTO_PAYLOAD_TYPE = 'application/vnd.in-toto+json'
const INTOTO_STATEMENT_TYPE = 'https://in-toto.io/Statement/v0.1'
const SLSA_PREDICATE_TYPE = 'https://slsa.dev/provenance/v0.2'
const BUILDER_ID = 'https://github.com/actions/runner'
const BUILD_TYPE_PREFIX = 'https://github.com/npm/cli/gha'
const BUILD_TYPE_VERSION = 'v2'
const generateProvenance = async (subject, opts) => {
const { env } = process
/* istanbul ignore next - not covering missing env var case */
const [workflowPath] = (env.GITHUB_WORKFLOW_REF || '')
.replace(env.GITHUB_REPOSITORY + '/', '')
.split('@')
const payload = {
_type: INTOTO_STATEMENT_TYPE,
subject,
predicateType: SLSA_PREDICATE_TYPE,
predicate: {
buildType: `${BUILD_TYPE_PREFIX}/${BUILD_TYPE_VERSION}`,
builder: { id: BUILDER_ID },
invocation: {
configSource: {
uri: `git+${env.GITHUB_SERVER_URL}/${env.GITHUB_REPOSITORY}@${env.GITHUB_REF}`,
digest: {
sha1: env.GITHUB_SHA,
},
entryPoint: workflowPath,
},
parameters: {},
environment: {
GITHUB_EVENT_NAME: env.GITHUB_EVENT_NAME,
GITHUB_REF: env.GITHUB_REF,
GITHUB_REPOSITORY: env.GITHUB_REPOSITORY,
GITHUB_REPOSITORY_ID: env.GITHUB_REPOSITORY_ID,
GITHUB_REPOSITORY_OWNER_ID: env.GITHUB_REPOSITORY_OWNER_ID,
GITHUB_RUN_ATTEMPT: env.GITHUB_RUN_ATTEMPT,
GITHUB_RUN_ID: env.GITHUB_RUN_ID,
GITHUB_SHA: env.GITHUB_SHA,
GITHUB_WORKFLOW_REF: env.GITHUB_WORKFLOW_REF,
GITHUB_WORKFLOW_SHA: env.GITHUB_WORKFLOW_SHA,
},
},
metadata: {
buildInvocationId: `${env.GITHUB_RUN_ID}-${env.GITHUB_RUN_ATTEMPT}`,
completeness: {
parameters: false,
environment: false,
materials: false,
},
reproducible: false,
},
materials: [
{
uri: `git+${env.GITHUB_SERVER_URL}/${env.GITHUB_REPOSITORY}@${env.GITHUB_REF}`,
digest: {
sha1: env.GITHUB_SHA,
},
},
],
},
}
return sigstore.attest(Buffer.from(JSON.stringify(payload)), INTOTO_PAYLOAD_TYPE, opts)
}
module.exports = {
generateProvenance,
}
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