fetch bot username from gh.com rather than $BOT_USERNAME env

Author: phillipj

README.md

@@ -29,9 +29,6 @@ See [CONTRIBUTING.md](CONTRIBUTING.md).
   Only required for the trigger Jenkins build script. The authentication token configured for a particular
   Jenkins job, for remote scripts to trigger builds remotely. Found on the job configuration page in
   `Build Triggers -> Trigger builds remotely (e.g., from scripts)`.
-- **`BOT_USERNAME`** (optional)<br>
-  Only required for the trigger Jenkins build script. Needed to know if comments made in a repository
-  meant directored to the bot, by mentioning the bot's username in the start of a comment.
 - **`LOGIN_CREDENTIALS`**<br>
   Username and password used to protected the log files exposed in /logs. Expected format: `username:password`.
 - **`KEEP_LOGS`**<br>

lib/bot-username.js

@@ -0,0 +1,14 @@
+const memoize = require('async').memoize
+
+const githubClient = require('./github-client')
+
+function requestGitHubForUsername (cb) {
+  githubClient.users.get({}, (err, currentUser) => {
+    if (err) {
+      return cb(err)
+    }
+    cb(null, currentUser.login)
+  })
+}
+
+exports.resolve = memoize(requestGitHubForUsername)

package.json

@@ -13,6 +13,7 @@
   "private": true,
   "license": "MIT",
   "dependencies": {
+    "async": "2.1.5",
     "basic-auth": "^1.0.4",
     "body-parser": "^1.15.0",
     "bunyan": "^1.8.1",

scripts/trigger-jenkins-build.js

@@ -3,16 +3,21 @@
 const request = require('request')
 
 const githubClient = require('../lib/github-client')
+const botUsername = require('../lib/bot-username')
 
-const botUsername = process.env.BOT_USERNAME || ''
 const jenkinsApiCredentials = process.env.JENKINS_API_CREDENTIALS || ''
 
-function wasBotMentioned (commentBody) {
-  // no need to check when we haven't specified the bot's current username
-  if (!botUsername) return false
+function ifBotWasMentioned (commentBody, cb) {
+  botUsername.resolve((err, username) => {
+    if (err) {
+      return cb(err)
+    }
 
-  const atBotName = new RegExp('^@' + botUsername)
-  return commentBody.match(atBotName) !== null
+    const atBotName = new RegExp('^@' + username)
+    const wasMentioned = commentBody.match(atBotName) !== null
+
+    cb(null, wasMentioned)
+  })
 }
 
 function isCiRunComment (commentBody) {
@@ -95,7 +100,7 @@ module.exports = (app) => {
       logger
     }
 
-    if (!wasBotMentioned(comment.body) || !isCiRunComment(comment.body)) return
+    if (!isCiRunComment(comment.body)) return
 
     function replyToCollabWithBuildStarted (err, buildUrl) {
       if (err) {
@@ -116,6 +121,14 @@ module.exports = (app) => {
       triggerBuild(options, replyToCollabWithBuildStarted)
     }
 
-    githubClient.repos.checkCollaborator({ owner, repo, username: commentAuthor }, triggerBuildWhenCollaborator)
+    ifBotWasMentioned(comment.body, (err, wasMentioned) => {
+      if (err) {
+        return logger.error(err, 'Error while checking if the bot username was mentioned in a comment')
+      }
+
+      if (!wasMentioned) return
+
+      githubClient.repos.checkCollaborator({ owner, repo, username: commentAuthor }, triggerBuildWhenCollaborator)
+    })
   })
 }