feat: each track.url update matching providerTrack

Author: Hugo Vieilledent

.gitignore

@@ -3,6 +3,9 @@
 # config
 .env
 
+# secrets
+.runtimeconfig.json
+
 # compiled output
 /dist
 /tmp

.nvmrc

@@ -0,0 +1 @@
+6.11.5

.runtimeconfig.json

@@ -195,3 +195,16 @@ Firebase allowed this project to come to life without having the need to spend t
 
 Do you want your project to appear here? Send a pull request or get in touch.
 
+## Developement
+
+`nvm use` will tell nvm to use the right `nodejs` version for this
+Firebase Function project. It reads it from the `.nvmrc` file.
+
+`firebase functions:config:get > .runtimeconfig.json` will download
+locally the secret keys saved in the project environment. You will
+need them to run the API.
+
+`yarn start` will run the API.
+
+`yarn firebase:shell` will run the Firebase shell, with which can
+locally be testes the non-https functions. See the [documentation](https://firebase.google.com/docs/functions/local-emulator).

README.md

@@ -1,4 +1,11 @@
 const functions = require('firebase-functions')
 const app = require('./src/app')
+const onTrackUrlChange = require('./src/on-track-url-change')
 
+// Public API for Radio4000
 exports.api = functions.https.onRequest(app)
+
+// Listen to every track change
+exports.onTrackUrlChange =
+	functions.database.ref('/tracks/{trackId}/url')
+	.onWrite(onTrackUrlChange)

index.js

@@ -7,6 +7,7 @@
   "scripts": {
     "start": "firebase serve --only hosting,functions --port 4001",
     "test": "ava",
+    "firebase:shell": "firebase functions:shell",
     "deploy-api": "firebase use staging; firebase deploy --only functions",
     "deploy-api-production": "firebase use production; firebase deploy --only functions",
     "deploy-rules": "firebase use staging; firebase deploy --only database",
@@ -16,14 +17,16 @@
     "body-parser": "^1.17.2",
     "cors": "^2.8.4",
     "express": "^4.15.3",
-    "firebase-admin": "^5.10.0",
-    "firebase-functions": "^0.8.2",
+    "firebase-admin": "^5.12.1",
+    "firebase-functions": "^1.1.0",
     "got": "^6.7.1",
     "radio4000-sdk": "^0.0.5",
-    "stripe": "^4.24.0"
+    "stripe": "^4.24.0",
+    "youtube-regex": "^1.0.5"
   },
   "devDependencies": {
     "ava": "^0.21.0",
-    "firebase-tools": "^3.17.7"
+    "firebase-tools": "^3.17.7",
+    "@google-cloud/functions-emulator": "^1.0.0-beta.4"
   }
 }

package.json

@@ -0,0 +1,39 @@
+const functions = require('firebase-functions')
+const admin = require('firebase-admin');
+const getYoutubeId = require('./utils/youtube-url-to-id.js')
+
+/*
+	To test the execution of this function
+	you can run `yarn firebase:shell`
+	and use the following mockup call
+	
+	onTrackUrlChange({before: 'youtu.be/xIaco5AQrUQ', after: 'https://www.youtube.com/watch?v=OkR7UNnQU6c' })
+*/
+
+const onTracksChange = (snapshot, context) => {
+	// console.log('snapshot: ', snapshot)
+	// console.log('context: ', context)
+	
+	let db = admin.database();
+
+	let newUrl = snapshot.after.val()
+	let providerId = getYoutubeId(newUrl)
+	let providerName = 'youtube'
+	
+	// abort if no ID in provider URL
+	if(!providerId) {
+		return false
+	}
+	
+	const ref = db.ref(`/providerTracks/${providerName}:${providerId}/tracks/${context.params.trackId}`);
+
+	return ref.set(true);
+}
+
+module.exports = onTracksChange
+
+/*
+Model `providerTrack`:
+- tracks: list of tracks that reference this providerTrack
+- discogsReleaseId: id of this track's release on discogs
+*/

src/on-track-url-change.js

@@ -0,0 +1,11 @@
+const youtubeRegex = require('youtube-regex')
+
+const youtubeUrlToId = function(url) {
+	const results = youtubeRegex().exec(url);
+	if (!results) {
+		return false;
+	}
+	return results[1];
+}
+
+module.exports =  youtubeUrlToId