feat: Danger - check for unpinned actions (#39)

* feat: Danger - check for unpinned actions

* chore: update changelog

* chore: 2.2.0 in changelog

Author: vaind

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+## 2.2.0
+
+### Features
+
+- Danger - check for that actions are pinned to a commit ([#39](https://github.com/getsentry/github-workflows/pull/39))
+
 ## 2.1.1
 
 ### Fixes

danger/CONTRIBUTING.md

@@ -0,0 +1,18 @@
+# Contributing
+
+## How to run dangerfile locally
+
+- [Working on your Dangerfile](https://danger.systems/js/guides/the_dangerfile.html#working-on-your-dangerfile)
+- [Using danger and Faking being on a CI](https://danger.systems/js/guides/the_dangerfile.html#using-danger-and-faking-being-on-a-ci)
+
+## TLDR
+
+```shell-script
+export DANGER_GITHUB_API_TOKEN='XXX'
+export DANGER_FAKE_CI="YEP"
+export DANGER_TEST_REPO='username/reponame'
+cd reponame
+export DANGER_TEST_PR='1234'
+git checkout branch-for-pr-1234
+npx danger ci --text-only --failOnErrors --dangerfile=../github-workflows/danger/dangerfile.js
+```

danger/dangerfile.js

@@ -118,9 +118,70 @@ If none of the above apply, you can opt out of this check by adding \`#skip-chan
   );
 }
 
+async function checkActionsArePinned() {
+  const workflowFiles = danger.git.created_files
+    .concat(danger.git.modified_files)
+    .filter((path) => path.startsWith(".github/workflows/"));
+
+  if (workflowFiles.length == 0) {
+    return;
+  }
+
+  console.log(
+    `::debug:: Some workflow files have been changed - checking whether actions are pinned: ${workflowFiles}`
+  );
+
+  const usesRegex = /^\+? *uses:/;
+  const usesActionRegex =
+    /^\+? *uses: *(?<user>[^\/]+)\/(?<action>[^@]+)@(?<ref>.*)/;
+  const shaRegex = /^[a-f0-9]{40}$/;
+  const whitelistedUsers = ["getsentry", "actions"];
+
+  for (const path of workflowFiles) {
+    const diff = await danger.git.structuredDiffForFile(path);
+    for (const chunk of diff.chunks) {
+      for (const change of chunk.changes) {
+        if (change.add) {
+          const match = change.content.match(usesActionRegex);
+          // Example of `match.groups`:
+          // [Object: null prototype] {
+          //   user: 'getsentry',
+          //   action: 'action-prepare-release',
+          //   ref: 'v1'
+          // }
+          if (match && match.groups) {
+            if (!match.groups.ref.match(shaRegex)) {
+              if (whitelistedUsers.includes(match.groups.user)) {
+                message(
+                  "Consider pinning the action by specifying a commit SHA instead of a tag/branch.",
+                  path,
+                  change.ln
+                );
+              } else {
+                fail(
+                  "Please pin the action by specifying a commit SHA instead of a tag/branch.",
+                  path,
+                  change.ln
+                );
+              }
+            }
+          } else if (change.content.match(usesRegex)) {
+            warn(
+              "Couldn't parse 'uses:' declaration while checking for action pinning.",
+              path,
+              change.ln
+            );
+          }
+        }
+      }
+    }
+  }
+}
+
 async function checkAll() {
   await checkDocs();
   await checkChangelog();
+  await checkActionsArePinned();
 }
 
 schedule(checkAll);