fix(github-actions): Fixes fetching of config inside github actions

Hopefully this should make it possible to read the label config file inside a github action by using the github api instead.

Author: thePunderWoman

.github/local-actions/branch-manager/main.js

@@ -0,0 +1,6 @@
+{
+  "labels": {
+    "target: minor": ["dev-infra/github-actions/pull-request-labeling/lib/"],
+    "target: patch": ["dev-infra/github-actions/pull-request-labeling/test/"]
+  }
+}

.ng-dev/labels.json

@@ -13,11 +13,14 @@ ts_project(
         ":node_modules/@actions/core",
         ":node_modules/@actions/github",
         ":node_modules/@octokit/rest",
+        ":node_modules/@types/micromatch",
         ":node_modules/@types/node",
+        ":node_modules/micromatch",
         ":node_modules/undici",
         "//github-actions:utils",
         "//ng-dev/commit-message",
         "//ng-dev/pr/common/labels",
+        "//ng-dev/pr/config",
     ],
 )
 

github-actions/pull-request-labeling/BUILD.bazel

@@ -3,7 +3,10 @@ import {context} from '@actions/github';
 import {Octokit, RestEndpointMethodTypes} from '@octokit/rest';
 import {Commit, parseCommitMessage} from '../../../ng-dev/commit-message/parse.js';
 import {actionLabels, managedLabels, targetLabels} from '../../../ng-dev/pr/common/labels/index.js';
+import {getConfig, NgDevConfig} from '../../../ng-dev/utils/config.js';
+import {PullRequestConfig} from '../../../ng-dev/pr/config/index.js';
 import {ANGULAR_ROBOT, getAuthTokenFor, revokeActiveInstallationToken} from '../../utils.js';
+import micromatch from 'micromatch';
 import {ManagedRepositories} from '../../../ng-dev/pr/common/labels/base.js';
 
 /** The type of the response data for a the pull request get method on from octokit. */
@@ -20,7 +23,7 @@ class PullRequestLabeling {
       const inst = new this(git);
       await inst.run();
     } finally {
-      await revokeActiveInstallationToken(git);
+      await revokeActiveInstallationToken(token);
     }
   };
 
@@ -32,6 +35,10 @@ class PullRequestLabeling {
   commits: Commit[] = [];
   /** The pull request information from the github API. */
   pullRequestMetadata?: PullRequestGetData;
+  /** The configuration for the pull request. */
+  config?: NgDevConfig<{pullRequest: PullRequestConfig}>;
+  /** The files in the pull request. */
+  pullRequestFilePaths: string[] = [];
 
   private constructor(private git: Octokit) {}
 
@@ -42,9 +49,31 @@ class PullRequestLabeling {
     core.info(`PR #${context.issue.number}`);
 
     await this.commitMessageBasedLabeling();
+    await this.pathBasedLabeling();
     await this.pullRequestMetadataLabeling();
   }
 
+  /**
+   * Perform labeling based on the path of the files in the pull request.
+   */
+  async pathBasedLabeling() {
+    const managedLabelByPath = this.config?.pullRequest?.managedLabelByPath;
+    if (!managedLabelByPath) {
+      return;
+    }
+
+    for (const [label, paths] of Object.entries(managedLabelByPath)) {
+      if (
+        this.pullRequestFilePaths.length > 0 &&
+        micromatch(this.pullRequestFilePaths, paths as string | string[]).length > 0
+      ) {
+        if (!this.labels.has(label)) {
+          await this.addLabel(label);
+        }
+      }
+    }
+  }
+
   /**
    * Perform labeling based on the commit messages for the pull request.
    */
@@ -133,6 +162,37 @@ class PullRequestLabeling {
     }
   }
 
+  /** Load the configuration for the pull request. */
+  private async loadConfig(): Promise<NgDevConfig<{pullRequest: PullRequestConfig}> | undefined> {
+    try {
+      return (await getConfig()) as NgDevConfig<{pullRequest: PullRequestConfig}>;
+    } catch {
+      const {owner, repo} = context.issue;
+      try {
+        const {data} = await this.git.repos.getContent({
+          owner,
+          repo,
+          path: '.ng-dev/labels.json',
+        });
+
+        if ('content' in data && typeof data.content === 'string') {
+          const content = Buffer.from(data.content, 'base64').toString();
+          const {labels} = JSON.parse(content);
+          return {
+            __isNgDevConfigObject: true,
+            pullRequest: {
+              managedLabelByPath: labels,
+              githubApiMerge: false, // Not used in this context
+            },
+          } as NgDevConfig<{pullRequest: PullRequestConfig}>;
+        }
+      } catch (e) {
+        core.info(`No .ng-dev/labels.json found.`);
+      }
+    }
+    return undefined;
+  }
+
   /** Initialize the current labels and commits for the PR. */
   async initialize() {
     const {number, owner, repo} = context.issue;
@@ -159,6 +219,14 @@ class PullRequestLabeling {
     await this.git.pulls.get({owner, repo, pull_number: number}).then(({data}) => {
       this.pullRequestMetadata = data;
     });
+
+    this.config = await this.loadConfig();
+
+    if (this.config?.pullRequest?.managedLabelByPath) {
+      await this.git
+        .paginate(this.git.pulls.listFiles, {owner, pull_number: number, repo})
+        .then((files) => this.pullRequestFilePaths.push(...files.map((file) => file.filename)));
+    }
   }
 }