From 93000422298b3d77f7568c5128cb9ebdd74cd4ab Mon Sep 17 00:00:00 2001
From: Alex Castells <alextremp@hotmail.com>
Date: Tue, 23 Jun 2020 09:09:42 +0200
Subject: [PATCH] Feature/stub (#1)

* add stub registration

* update docs
---
 .npmignore                                    |  6 +-
 README.md                                     | 45 +++++++++++--
 package.json                                  |  4 +-
 src/main/index.js                             |  4 +-
 .../service/handler/PostMessageHandler.js     | 34 ++++++++++
 src/main/service/handler/TcfApiHandler.js     | 33 +++++++++
 .../service/registerIframeMessageHandler.js   | 10 +++
 src/main/service/registerStub.js              | 14 ++++
 src/main/service/registerTcfApiHandler.js     |  7 ++
 src/main/service/registerTcfApiLocator.js     | 16 +++++
 src/main/service/waitUntil.js                 | 20 ++++++
 src/test/indexTest.js                         | 67 ++++++++++++++++++-
 src/webpack/deploy.webpack.config.js          |  2 +-
 src/webpack/dev.index.js                      |  3 -
 src/webpack/dev.webpack.config.js             |  2 +-
 src/webpack/standalone.index.js               |  3 +
 versiona.js                                   |  1 -
 17 files changed, 255 insertions(+), 16 deletions(-)
 create mode 100644 src/main/service/handler/PostMessageHandler.js
 create mode 100644 src/main/service/handler/TcfApiHandler.js
 create mode 100644 src/main/service/registerIframeMessageHandler.js
 create mode 100644 src/main/service/registerStub.js
 create mode 100644 src/main/service/registerTcfApiHandler.js
 create mode 100644 src/main/service/registerTcfApiLocator.js
 create mode 100644 src/main/service/waitUntil.js
 delete mode 100644 src/webpack/dev.index.js
 create mode 100644 src/webpack/standalone.index.js

diff --git a/.npmignore b/.npmignore
index 3ba775c..1b2e496 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,4 +1,5 @@
 src
+deploy
 coverage
 .nyc_output
 .travis.yml
@@ -8,4 +9,7 @@ coverage
 resources
 package
 *.tgz
-versiona.js
\ No newline at end of file
+versiona.js
+deploy.js
+mocha.config.js
+.babelrc.js
\ No newline at end of file
diff --git a/README.md b/README.md
index d557160..6288837 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,3 @@
-![](/resources/logo/boros_logo.png)
-
 # Boros TCF Stub
 
 [![Build status](https://travis-ci.org/scm-spain/boros-tcf-stub.svg?branch=master)](https://travis-ci.org/scm-spain/boros-tcf-stub)
@@ -11,19 +9,56 @@
 
 * [About](#about)
 * [Features](#features)
-* [Technical features](#technical-features)
-* [Configuration](#configuration)
 * [Usage](#usage)
 * [License](#license)
 
 
 ## About
 
+The Boros TCF stub implements the [standard TCF v2 stub](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/IAB%20Tech%20Lab%20-%20CMP%20API%20v2.md#how-does-the-cmp-stub-api-work)
+
 ## Features
 
-## Technical features
+- Registers the `__tcfapiLocator` frame
+
+- Stubs the `window.__tcfapi` responding immediately to the commands
+  - `ping` [See PingReturn in the stubbed __tcfapi](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/IAB%20Tech%20Lab%20-%20CMP%20API%20v2.md#requirements-for-the-cmp-stub-api-script)
+  - `pending` returns the pending calls accumulated while calling `window.__tcfapi` commands
+
+- Initializes the cross-framee communication via `postMessagee`, [see usage details](https://github.com/InteractiveAdvertisingBureau/GDPR-Transparency-and-Consent-Framework/blob/master/TCFv2/IAB%20Tech%20Lab%20-%20CMP%20API%20v2.md#how-can-vendors-that-use-iframes-call-the-cmp-api-from-an-iframe)
 
 ## Usage
 
+### As an importable module
+
+> Use it this way if you're generating your own initialization
+
+**Install**
+```
+npm i @adv-ui/boros-tcf-stub --save
+```
+
+**Register the Stub**
+```
+import registerStub from '../main'
+
+// do your magic
+
+registerStub()
+```
+
+> Remember that the Stub **must** be registered before any script depending on the TCF is loaded
+
+### As a standalone script
+
+**Add it to the `head` tag**
+
+```
+<script
+  src="https://c.dcdn.es/borostcf/stub/BorosTcfStub.pro.js"
+  async="false" 
+/>
+```
+
 ## License
 Boros TCF Stub is [MIT licensed](./LICENSE).
diff --git a/package.json b/package.json
index 5acf291..d640c4f 100644
--- a/package.json
+++ b/package.json
@@ -4,14 +4,16 @@
   "description": "Adevinta GDPR - Transparency and Consent Framework - Stub for Boros TCF",
   "main": "dist",
   "scripts": {
+    "build": "rm -Rf dist && babel src/main --out-dir dist",
     "check": "npm run lint && npm run test",
     "coverage": "nyc --reporter=html --exclude='\"src/test/**/*Test.js\"' npm run test",
     "coverage:ci": "nyc --reporter=cobertura --exclude='\"src/test/**/*Test.js\"' npm run test && codecov",
-    "deploy": "rm -Rf ./deploy && npm run deploy:webpack && npm run deploy:s3",
+    "deploy": "rm -Rf deploy && npm run deploy:webpack && npm run deploy:s3",
     "deploy:s3": "node deploy.js",
     "deploy:webpack": "webpack --config src/webpack/deploy.webpack.config.js --progress --profile --colors --display-error-details --display-cached",
     "lint": "sui-lint js",
     "phoenix": "rm -Rf node_modules && rm -Rf package-lock.json && npm i",
+    "prepack": "npm run build",
     "start": "webpack-dev-server --config src/webpack/dev.webpack.config.js",
     "test": "sui-test server --pattern '\"src/test/**/*Test.js\"'",
     "versiona": "node versiona.js"
diff --git a/src/main/index.js b/src/main/index.js
index 5e13680..79e2ab2 100644
--- a/src/main/index.js
+++ b/src/main/index.js
@@ -1 +1,3 @@
-console.log('nothing here yet')
+import {registerStub} from './service/registerStub'
+
+export default registerStub
diff --git a/src/main/service/handler/PostMessageHandler.js b/src/main/service/handler/PostMessageHandler.js
new file mode 100644
index 0000000..98c168b
--- /dev/null
+++ b/src/main/service/handler/PostMessageHandler.js
@@ -0,0 +1,34 @@
+export class PostMessageHandler {
+  handle(event = {}) {
+    const payload = this._toPayload(event.data)
+    payload &&
+      window.__tcfapi(
+        payload.command,
+        payload.version,
+        (retValue, success) => {
+          const returnMsg = {
+            __tcfapiReturn: {
+              returnValue: retValue,
+              success: success,
+              callId: payload.callId
+            }
+          }
+          if (typeof event.data === 'string') {
+            event.source.postMessage(JSON.stringify(returnMsg), '*')
+          } else {
+            event.source.postMessage(returnMsg, '*')
+          }
+        },
+        payload.parameter
+      )
+  }
+
+  _toPayload(message = {}) {
+    try {
+      const json = typeof message === 'string' ? JSON.parse(message) : message
+      return json?.__tcfapiCall
+    } catch (error) {
+      return undefined
+    }
+  }
+}
diff --git a/src/main/service/handler/TcfApiHandler.js b/src/main/service/handler/TcfApiHandler.js
new file mode 100644
index 0000000..77498e7
--- /dev/null
+++ b/src/main/service/handler/TcfApiHandler.js
@@ -0,0 +1,33 @@
+/* eslint-disable standard/no-callback-literal */
+export class TcfApiHandler {
+  constructor() {
+    this._queue = []
+  }
+
+  handle({command, version, callback, parameter}) {
+    switch (command) {
+      case PING_COMMAND: {
+        if (typeof callback === 'function') {
+          callback({
+            gdprApplies: true,
+            cmpLoaded: false,
+            cmpStatus: 'stub'
+          })
+        }
+        break
+      }
+      case PENDING_COMMAND: {
+        return this._queue
+      }
+      default: {
+        this._queue.push(() =>
+          window.__tcfapi(command, version, callback, parameter)
+        )
+        break
+      }
+    }
+  }
+}
+
+const PING_COMMAND = 'ping'
+const PENDING_COMMAND = 'pending'
diff --git a/src/main/service/registerIframeMessageHandler.js b/src/main/service/registerIframeMessageHandler.js
new file mode 100644
index 0000000..432b475
--- /dev/null
+++ b/src/main/service/registerIframeMessageHandler.js
@@ -0,0 +1,10 @@
+import {PostMessageHandler} from './handler/PostMessageHandler'
+
+const postMessageHandler = new PostMessageHandler()
+export const registerIframeMessageHandler = () => {
+  window.addEventListener(
+    'message',
+    event => postMessageHandler.handle(event),
+    false
+  )
+}
diff --git a/src/main/service/registerStub.js b/src/main/service/registerStub.js
new file mode 100644
index 0000000..cb4c6db
--- /dev/null
+++ b/src/main/service/registerStub.js
@@ -0,0 +1,14 @@
+import {registerTcfApiLocator} from './registerTcfApiLocator'
+import {registerIframeMessageHandler} from './registerIframeMessageHandler'
+import {registerTcfApiHandler} from './registerTcfApiHandler'
+
+export const registerStub = () => {
+  if (typeof window === 'undefined') {
+    return
+  }
+  if (!registerTcfApiLocator()) {
+    return
+  }
+  registerIframeMessageHandler()
+  registerTcfApiHandler()
+}
diff --git a/src/main/service/registerTcfApiHandler.js b/src/main/service/registerTcfApiHandler.js
new file mode 100644
index 0000000..c3989c5
--- /dev/null
+++ b/src/main/service/registerTcfApiHandler.js
@@ -0,0 +1,7 @@
+import {TcfApiHandler} from './handler/TcfApiHandler'
+
+const tcfApiHandler = new TcfApiHandler()
+export const registerTcfApiHandler = () => {
+  window.__tcfapi = (command, version, callback, parameter) =>
+    tcfApiHandler.handle({command, version, callback, parameter})
+}
diff --git a/src/main/service/registerTcfApiLocator.js b/src/main/service/registerTcfApiLocator.js
new file mode 100644
index 0000000..02ee59f
--- /dev/null
+++ b/src/main/service/registerTcfApiLocator.js
@@ -0,0 +1,16 @@
+import {waitUntil} from './waitUntil'
+
+export const registerTcfApiLocator = () => {
+  if (window.frames[TCF_API_LOCATOR]) {
+    return false
+  }
+  waitUntil({condition: () => !!window.document.body}).then(() => {
+    const iframe = window.document.createElement('iframe')
+    iframe.style.cssText = 'display:none'
+    iframe.name = TCF_API_LOCATOR
+    window.document.body.appendChild(iframe)
+  })
+  return true
+}
+
+const TCF_API_LOCATOR = '__tcfapiLocator'
diff --git a/src/main/service/waitUntil.js b/src/main/service/waitUntil.js
new file mode 100644
index 0000000..0723b9d
--- /dev/null
+++ b/src/main/service/waitUntil.js
@@ -0,0 +1,20 @@
+export const waitUntil = ({
+  condition,
+  timeout = 20000,
+  interval = 5,
+  timeoutMessage
+}) =>
+  new Promise((resolve, reject) => {
+    const iid = setInterval(() => {
+      if (condition()) {
+        clearTimeout(tid)
+        clearInterval(iid)
+        resolve()
+      }
+    }, interval)
+    const tid = setTimeout(() => {
+      clearTimeout(tid)
+      clearInterval(iid)
+      reject(new Error(timeoutMessage))
+    }, timeout)
+  })
diff --git a/src/test/indexTest.js b/src/test/indexTest.js
index 668f6e5..8f948ed 100644
--- a/src/test/indexTest.js
+++ b/src/test/indexTest.js
@@ -1,6 +1,69 @@
+import jsdom from 'jsdom-global'
 import {expect} from 'chai'
+import registerStub from '../main'
+import {waitUntil} from '../main/service/waitUntil'
+
 describe('boros tcf stub', () => {
-  it('should be tested', () => {
-    expect(true).to.be.true
+  beforeEach(() => {
+    jsdom(null, {runScripts: 'dangerously'})
+    window.postMessage = message => {
+      const event = new window.MessageEvent('message', {
+        data: message,
+        source: window
+      })
+      window.dispatchEvent(event)
+    }
+  })
+
+  it('should register the __tcfapiLocator iframe', () => {
+    registerStub()
+    return waitUntil({condition: () => !!window.frames.__tcfapiLocator})
+  })
+
+  it('should register the __tcfapi facade with pending command', () => {
+    registerStub()
+    let pending = window.__tcfapi('pending')
+    expect(pending.length).to.equal(0)
+
+    let pinged = false
+    window.__tcfapi('ping', 2, () => (pinged = true))
+    expect(pinged).to.be.true
+    pending = window.__tcfapi('pending')
+    expect(pending.length).to.equal(0)
+
+    window.__tcfapi('anyOtherCommand', 2, () => null)
+    pending = window.__tcfapi('pending')
+    expect(pending.length).to.equal(1)
+  })
+
+  it('should accept iframe communications', () => {
+    registerStub()
+
+    const callId = Math.random() + ''
+    const msg = {
+      __tcfapiCall: {
+        command: 'ping',
+        version: '2',
+        callId: callId
+      }
+    }
+
+    const responsePromise = new Promise((resolve, reject) =>
+      window.addEventListener('message', event => {
+        try {
+          const response = event.data.__tcfapiReturn
+          if (response) {
+            expect(response.callId).to.equal(callId)
+            expect(response.returnValue.cmpStatus).to.equal('stub')
+            resolve()
+          }
+        } catch (error) {
+          reject(error)
+        }
+      })
+    )
+
+    window.postMessage(msg, '*')
+    return responsePromise
   })
 })
diff --git a/src/webpack/deploy.webpack.config.js b/src/webpack/deploy.webpack.config.js
index 0740798..3404936 100644
--- a/src/webpack/deploy.webpack.config.js
+++ b/src/webpack/deploy.webpack.config.js
@@ -11,7 +11,7 @@ module.exports = [
   {
     devtool: distMinified ? false : 'inline-source-map',
     entry: {
-      BorosTcfStub: './src/main/index.js'
+      BorosTcfStub: './src/webpack/standalone.index.js'
     },
     output: {
       path: path.resolve(path.join(__dirname, '/../../', 'deploy')),
diff --git a/src/webpack/dev.index.js b/src/webpack/dev.index.js
deleted file mode 100644
index ae2dfd1..0000000
--- a/src/webpack/dev.index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-import '../main'
-
-console.log('DEV | boros tcf stub')
diff --git a/src/webpack/dev.webpack.config.js b/src/webpack/dev.webpack.config.js
index 56852aa..f9b0185 100644
--- a/src/webpack/dev.webpack.config.js
+++ b/src/webpack/dev.webpack.config.js
@@ -5,7 +5,7 @@ const {CleanWebpackPlugin} = require('clean-webpack-plugin')
 module.exports = {
   mode: 'development',
   entry: {
-    app: './src/webpack/dev.index.js'
+    app: './src/webpack/standalone.index.js'
   },
   devtool: 'inline-source-map',
   plugins: [
diff --git a/src/webpack/standalone.index.js b/src/webpack/standalone.index.js
new file mode 100644
index 0000000..98d13af
--- /dev/null
+++ b/src/webpack/standalone.index.js
@@ -0,0 +1,3 @@
+import registerStub from '../main'
+
+registerStub()
diff --git a/versiona.js b/versiona.js
index f905bdd..93c8c7b 100644
--- a/versiona.js
+++ b/versiona.js
@@ -3,6 +3,5 @@ const versiona = require('versiona')
 versiona({
   repoOrg: 'scm-spain',
   repoName: 'boros-tcf-stub',
-  publish: false,
   masterCommand: env => `DEPLOY_ENV=${env} npm run deploy`
 })