Show vulnerabities and license information on the job summary.

Users can see the results that were found directly on the job summary

All the results are grouped by manifest.

It shows a table with vulnerable packages, together with package version,
the vulnerabily info and it's severity.

Shows info about package licenses, which packages have a non allowed license,
and the list of packages with unknown licenses.

src/summary.ts

@@ -0,0 +1,163 @@
+import * as core from '@actions/core'
+import {ConfigurationOptions, Change, Changes} from './schemas'
+import {SummaryTableRow} from '@actions/core/lib/summary'
+
+export function addSummaryToSummary(
+  addedPackages: Changes,
+  licenseErrors: Change[],
+  unknownLicenses: Change[]
+): void {
+  core.summary
+    .addHeading('Dependency Review')
+    .addRaw(
+      `We found ${addedPackages.length} vulnerable package(s), ${licenseErrors.length} package()s with incompatible licenses, and ${unknownLicenses.length} package(s) with unknown licenses.`
+    )
+}
+
+export function addChangeVulnerabilitiesToSummary(
+  addedPackages: Changes,
+  severity: string
+): void {
+  const rows: SummaryTableRow[] = []
+
+  const manifests = getManifests(addedPackages)
+
+  core.summary
+    .addHeading('Vulnerabilities')
+    .addQuote(
+      `Vulnerabilites were filtered by mininum severity <strong>${severity}</strong>.`
+    )
+
+  if (addedPackages.length === 0) {
+    core.summary.addQuote('No vulnerabilities found in added packages.')
+    return
+  }
+
+  for (const manifest of manifests) {
+    for (const change of addedPackages.filter(
+      pkg => pkg.manifest === manifest
+    )) {
+      let previous_package = ''
+      let previous_version = ''
+      for (const vuln of change.vulnerabilities) {
+        const sameAsPrevious =
+          previous_package === change.name &&
+          previous_version === change.version
+
+        if (!sameAsPrevious) {
+          rows.push([
+            renderUrl(change.source_repository_url, change.name),
+            change.version,
+            renderUrl(vuln.advisory_url, vuln.advisory_summary),
+            vuln.severity
+          ])
+        } else {
+          rows.push([
+            {data: '', colspan: '2'},
+            renderUrl(vuln.advisory_url, vuln.advisory_summary),
+            vuln.severity
+          ])
+        }
+        previous_package = change.name
+        previous_version = change.version
+      }
+    }
+    core.summary.addHeading(`<em>${manifest}</em>`, 3).addTable([
+      [
+        {data: 'Name', header: true},
+        {data: 'Version', header: true},
+        {data: 'Vulnerability', header: true},
+        {data: 'Severity', header: true}
+      ],
+      ...rows
+    ])
+  }
+}
+
+export function addLicensesToSummary(
+  licenseErrors: Change[],
+  unknownLicenses: Change[],
+  config: ConfigurationOptions
+): void {
+  core.summary.addHeading('Licenses')
+
+  if (config.allow_licenses && config.allow_licenses.length > 0) {
+    core.summary.addQuote(
+      `<strong>Allowed Licenses</strong>: ${config.allow_licenses.join(', ')}`
+    )
+  }
+  if (config.deny_licenses && config.deny_licenses.length > 0) {
+    core.summary.addQuote(
+      `<strong>Denied Licenses</strong>: ${config.deny_licenses.join(', ')}`
+    )
+  }
+
+  if (licenseErrors.length === 0 && unknownLicenses.length === 0) {
+    core.summary.addQuote('No license violations detected.')
+    return
+  }
+
+  if (licenseErrors.length > 0) {
+    const rows: SummaryTableRow[] = []
+    const manifests = getManifests(licenseErrors)
+
+    core.summary.addHeading('Incompatible Licenses', 3).addSeparator()
+
+    for (const manifest of manifests) {
+      core.summary.addHeading(`<em>${manifest}</em>`, 4)
+
+      for (const change of licenseErrors.filter(
+        pkg => pkg.manifest === manifest
+      )) {
+        rows.push([
+          renderUrl(change.source_repository_url, change.name),
+          change.version,
+          change.license || ''
+        ])
+      }
+      core.summary.addTable([['Package', 'Version', 'License'], ...rows])
+    }
+  } else {
+    core.summary.addQuote('No license violations detected.')
+  }
+
+  core.debug(`found ${unknownLicenses.length} unknown licenses`)
+
+  if (unknownLicenses.length > 0) {
+    const rows: SummaryTableRow[] = []
+    const manifests = getManifests(unknownLicenses)
+
+    core.debug(
+      `found ${manifests.entries.length} manifests for unknown licenses`
+    )
+
+    core.summary.addHeading('Unknown Licenses', 3).addSeparator()
+
+    for (const manifest of manifests) {
+      core.summary.addHeading(`<em>${manifest}</em>`, 4)
+
+      for (const change of unknownLicenses.filter(
+        pkg => pkg.manifest === manifest
+      )) {
+        rows.push([
+          renderUrl(change.source_repository_url, change.name),
+          change.version
+        ])
+      }
+
+      core.summary.addTable([['Package', 'Version'], ...rows])
+    }
+  }
+}
+
+function getManifests(changes: Changes): Set<string> {
+  return new Set(changes.flatMap(c => c.manifest))
+}
+
+function renderUrl(url: string | null, text: string): string {
+  if (url) {
+    return `<a href="${url}">${text}</a>`
+  } else {
+    return text
+  }
+}