Bypass purls (mostly) for deny checks

src/config.ts

@@ -233,7 +233,7 @@ function validatePURL(allow_dependencies_licenses: string[] | undefined): void {
     return
   }
   const invalid_purls = allow_dependencies_licenses.filter(
-    purl => !PackageURL.fromString(purl)
+    purl => !isPURLValid(purl)
   )
 
   if (invalid_purls.length > 0) {
@@ -243,3 +243,11 @@ function validatePURL(allow_dependencies_licenses: string[] | undefined): void {
   }
   return
 }
+
+const isPURLValid = (purl: string): boolean => {
+  try {
+    return PackageURL.fromString(purl) !== null
+  } catch (error) {
+    return false
+  }
+}

src/deny.ts

@@ -1,6 +1,7 @@
 import * as core from '@actions/core'
 import {Change} from './schemas'
 import {PackageURL} from 'packageurl-js'
+import {parsePURL} from './utils'
 
 export async function getDeniedChanges(
   changes: Change[],
@@ -11,29 +12,19 @@ export async function getDeniedChanges(
 
   let hasDeniedPackage = false
   for (const change of changes) {
-    let changedPackage: PackageURL
-    try {
-      changedPackage = PackageURL.fromString(change.package_url)
-    } catch (error) {
-      core.error(`Error parsing package URL '${change.package_url}': ${error}`)
-      continue
-    }
-
     for (const denied of deniedPackages) {
       if (
-        (!denied.version || changedPackage.version === denied.version) &&
-        changedPackage.name === denied.name
+        (!denied.version || change.version === denied.version) &&
+        change.name === denied.name
       ) {
         changesDenied.push(change)
         hasDeniedPackage = true
       }
     }
 
     for (const denied of deniedGroups) {
-      if (
-        changedPackage.namespace &&
-        changedPackage.namespace === denied.namespace
-      ) {
+      const namespace = getNamespace(change)
+      if (namespace && namespace === denied.namespace) {
         changesDenied.push(change)
         hasDeniedPackage = true
       }
@@ -48,3 +39,31 @@ export async function getDeniedChanges(
 
   return changesDenied
 }
+
+// getNamespace returns the namespace associated with the given change.
+// it tries to get this from the package_url member, but that won't exist
+// for all changes, so as a fallback it may create a new purl based on the
+// ecosystem and name associated with the change, then extract the namespace
+// from that.
+// returns '' if there is no namespace.
+export const getNamespace = (change: Change): string => {
+  let purl_str: string
+  if (change.package_url) {
+    purl_str = change.package_url
+  } else {
+    purl_str = `pkg:${change.ecosystem}/${change.name}`
+  }
+
+  try {
+    const purl = parsePURL(purl_str)
+    const namespace = purl.namespace
+    if (namespace === undefined || namespace === null) {
+      return ''
+    } else {
+      return namespace
+    }
+  } catch (e) {
+    core.error(`Error parsing purl '${purl_str}': ${e}`)
+    return ''
+  }
+}

src/licenses.ts

@@ -1,6 +1,6 @@
 import spdxSatisfies from 'spdx-satisfies'
 import {Change, Changes} from './schemas'
-import {isSPDXValid, octokitClient} from './utils'
+import {isSPDXValid, octokitClient, parsePURL} from './utils'
 import {PackageURL} from 'packageurl-js'
 
 /**
@@ -45,9 +45,7 @@ export async function getInvalidLicenseChanges(
       return true
     }
 
-    const changeAsPackageURL = PackageURL.fromString(
-      encodeURI(change.package_url)
-    )
+    const changeAsPackageURL = parsePURL(encodeURI(change.package_url))
 
     // We want to find if the licenseExclussion list contains the PackageURL of the Change
     // If it does, we want to filter it out and therefore return false

src/utils.ts

@@ -80,10 +80,36 @@ export const parsePURL = (purlString: string): PackageURL => {
     ) {
       //packageurl-js does not support empty names, so will manually override it for deny-groups
       //https://github.com/package-url/packageurl-js/blob/master/src/package-url.js#L216
-      const purl = PackageURL.fromString(`${purlString}TEMP_NAME`)
+      const fixedPurlString = addTempName(purlString)
+      const purl = PackageURL.fromString(fixedPurlString)
       purl.name = ''
       return purl
+    } else if ((error as Error).message === `version must be percent-encoded`) {
+      core.error(
+        `Version must be percent-encoded. Removing version from purl: '${purlString}.`
+      )
+      const fixedPurlString = removeVersion(purlString)
+      const purl = parsePURL(fixedPurlString)
+      purl.version = ''
+      return purl
     }
+    core.error(`Error parsing purl: ${purlString}`)
     throw error
   }
 }
+
+export const removeVersion = (purlString: string): string => {
+  // sometimes these errors are actually caused by a final '/', so try removing that first
+  if (purlString.endsWith('/')) {
+    return purlString.substring(0, purlString.length - 1)
+  }
+  const idx = purlString.lastIndexOf('@')
+  return purlString.substring(0, idx)
+}
+
+export const addTempName = (purlString: string): string => {
+  if (purlString.endsWith('/')) {
+    return `${purlString}TEMP_NAME`
+  }
+  return `${purlString}/TEMP_NAME`
+}