Support file path for GitHub last commit

Author: ReubenFrankel

services/github/github-last-commit.service.js

@@ -24,6 +24,7 @@ const schema = Joi.array()
 const displayEnum = ['author', 'committer']
 
 const queryParamSchema = Joi.object({
+  path: Joi.string().uri({ relativeOnly: true }),
   display_timestamp: Joi.string()
     .valid(...displayEnum)
     .default('author'),
@@ -45,6 +46,12 @@ export default class GithubLastCommit extends GithubAuthV3Service {
         parameters: [
           pathParam({ name: 'user', example: 'google' }),
           pathParam({ name: 'repo', example: 'skia' }),
+          queryParam({
+            name: 'path',
+            example: 'README.md',
+            schema: { type: 'string' },
+            description: 'File path to resolve the last commit for.',
+          }),
           queryParam({
             name: 'display_timestamp',
             example: 'committer',
@@ -62,6 +69,12 @@ export default class GithubLastCommit extends GithubAuthV3Service {
           pathParam({ name: 'user', example: 'google' }),
           pathParam({ name: 'repo', example: 'skia' }),
           pathParam({ name: 'branch', example: 'infra/config' }),
+          queryParam({
+            name: 'path',
+            example: 'README.md',
+            schema: { type: 'string' },
+            description: 'File path to resolve the last commit for.',
+          }),
           queryParam({
             name: 'display_timestamp',
             example: 'committer',
@@ -82,20 +95,21 @@ export default class GithubLastCommit extends GithubAuthV3Service {
     }
   }
 
-  async fetch({ user, repo, branch }) {
+  async fetch({ user, repo, branch, path }) {
     return this._requestJson({
       url: `/repos/${user}/${repo}/commits`,
-      options: { searchParams: { sha: branch } },
+      options: { searchParams: { sha: branch, path } },
       schema,
       httpErrors: httpErrorsFor(),
     })
   }
 
   async handle({ user, repo, branch }, queryParams) {
-    const body = await this.fetch({ user, repo, branch })
+    const { path, display_timestamp: displayTimestamp } = queryParams
+    const body = await this.fetch({ user, repo, branch, path })
 
     return this.constructor.render({
-      commitDate: body[0].commit[queryParams.display_timestamp].date,
+      commitDate: body[0].commit[displayTimestamp].date,
     })
   }
 }