Add Github Check (noServerNovember)

Author: Fran Ortiz

README.md

@@ -52,6 +52,7 @@ serverless install -u https://github.com/serverless/examples/tree/master/folder-
 | [Aws Fetch File And Store In S3](https://github.com/serverless/examples/tree/master/aws-node-fetch-file-and-store-in-s3) <br/> Fetch an image from remote source (URL) and then upload the image to a S3 bucket. | nodeJS |
 | [Aws Function Compiled With Babel](https://github.com/serverless/examples/tree/master/aws-node-function-compiled-with-babel) <br/> Demonstrating how to compile all your code with Babel | nodeJS |
 | [Aws Github Webhook Listener](https://github.com/serverless/examples/tree/master/aws-node-github-webhook-listener) <br/> Extend your github repositories with this github webhook listener | nodeJS |
+| [Aws Github Check](https://github.com/serverless/examples/tree/master/aws-node-github-check) <br/> Check that your Pull Requests contain some desired rules | nodeJS |
 | [Aws Node Graphql Api With Dynamodb](https://github.com/serverless/examples/tree/master/aws-node-graphql-api-with-dynamodb) <br/> A single-module GraphQL endpoint with query and mutation functionality. | nodeJS |
 | [Aws Iot Event](https://github.com/serverless/examples/tree/master/aws-node-iot-event) <br/> Example on how to setup a AWS IoT Rule to send events to a Lambda function | nodeJS |
 | [Dropbox](https://github.com/serverless/examples/tree/master/aws-node-oauth-dropbox-api) <br/> dropbox integration | nodeJS |

aws-node-github-check/.babelrc

@@ -0,0 +1,7 @@
+{
+  "plugins": ["source-map-support", "transform-runtime"],
+  "presets": [
+    ["env", { "node": "8.10" }],
+    "stage-3"
+  ]
+}

aws-node-github-check/.gitignore

@@ -0,0 +1,4 @@
+
+node_modules
+.serverless
+.webpack

aws-node-github-check/README.md

@@ -0,0 +1,9 @@
+# Serverless Github Check
+Serverless Github Check. This repo is part of the [Serverless November Challengue](https://serverless.com/blog/no-server-november-challenge/)
+
+The idea is to validate that all Pull Requests are related to a specific trello card.
+
+Check rules:
+
+* To pass the check, the Pull Request body should start with: "Related trello card: https://trello.com/"
+

aws-node-github-check/handler.js

@@ -0,0 +1,20 @@
+import { client } from 'octonode'
+import { success, failure, githubSuccessPayload, githubFailurePayload } from './libs/response-lib'
+import {
+  isAValidPullRequest, eventIsAPullRequest, updatePullRequestStatus, checkWebhookSecret
+} from './libs/github-service'
+
+export async function githubCheck(event, context, callback) {
+  const githubClient = client(process.env.GITHUB_TOKEN)
+  checkWebhookSecret(process.env.GITHUB_WEBHOOK_SECRET)
+
+  let body = JSON.parse(event.body)
+  if (!eventIsAPullRequest(body)) return callback(null, success('Event is not a Pull Request'))
+  const payload = isAValidPullRequest(body) ? githubSuccessPayload() : githubFailurePayload()
+  try {
+    await updatePullRequestStatus(githubClient, payload, body.repository, body.pull_request)
+    callback(null, success(`Process finished with state: ${payload.state}`))
+  } catch (e) {
+    callback(null, failure(`Process finished with error`))
+  }
+}

aws-node-github-check/libs/github-service.js

@@ -0,0 +1,27 @@
+export function isAValidPullRequest(body) {
+  if (!body.pull_request.body.startsWith('Related trello card: https://trello.com')) return false
+  return true
+}
+
+export function eventIsAPullRequest(body) {
+  if (!body || !body.hasOwnProperty('pull_request')) return false
+  return true
+}
+
+export function updatePullRequestStatus(githubClient, payload, repository, pullRequest) {
+  return new Promise((resolve, reject) => {
+    githubClient.post(`/repos/${repository.full_name}/statuses/${pullRequest.head.sha}`, payload, {}, (err, _body) => {
+      if (err) {
+        reject(err)
+      } else {
+        resolve()
+      }
+    })
+  })
+}
+
+export function checkWebhookSecret(secret) {
+  if (typeof secret !== 'string') {
+    return callback(null, failure('Must provide a \'GITHUB_WEBHOOK_SECRET\' env variable'))
+  }
+}

aws-node-github-check/libs/response-lib.js

@@ -0,0 +1,30 @@
+export function success(body) {
+  return buildResponse(204, body)
+}
+
+export function failure(body) {
+  return buildResponse(500, body)
+}
+
+export function githubSuccessPayload() {
+  return buildGithubPayload('success', 'PR body according to format')
+}
+
+export function githubFailurePayload() {
+  return buildGithubPayload('failure', 'PR body should start with the related trello card')
+}
+
+function buildGithubPayload(state, description) {
+  return {
+    state: state,
+    description: description,
+    context: 'serverless-webhook/pr-body'
+  }
+}
+
+function buildResponse(statusCode, body) {
+  return {
+    statusCode: statusCode,
+    body: JSON.stringify(body)
+  }
+}