chore: Universal Linking for Android (#2324)

* android assetlinks.json config

* try renaming html to json

* update env example

* chore: fix styling

* chore: styling part 2

* test: add spec for android assetlinks

* minor fixes

* minor fixes

* remove android sha256 value from env example

* add default sh256 value

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

.env.example

@@ -116,6 +116,10 @@ SLACK_CLIENT_SECRET=
 ### Change this env variable only if you are using a custom build mobile app
 ## Mobile app env variables
 IOS_APP_ID=6C953F3RX2.com.chatwoot.app
+ANDROID_BUNDLE_ID=com.chatwoot.app
+
+# https://developers.google.com/android/guides/client-auth (use keytool to print the fingerprint in the first section)
+ANDROID_SHA256_CERT_FINGERPRINT=AC:73:8E:DE:EB:56:EA:CC:10:87:02:A7:65:37:7B:38:D4:5D:D4:53:F8:3B:FB:D3:C6:28:64:1D:AA:08:1E:D8
 
 
 ### Smart App Banner

app/controllers/android_app_controller.rb

@@ -0,0 +1,5 @@
+class AndroidAppController < ApplicationController
+  def assetlinks
+    render layout: false
+  end
+end

app/views/android_app/assetlinks.json.erb

@@ -0,0 +1,12 @@
+[
+  {
+    "relation": ["delegate_permission/common.handle_all_urls"],
+    "target": {
+      "namespace": "android_app",
+      "package_name": "<%= ENV['ANDROID_BUNDLE_ID'] %>",
+      "sha256_cert_fingerprints": [
+        "<%= ENV['ANDROID_SHA256_CERT_FINGERPRINT'] %>"
+      ]
+    }
+  }
+]

config/routes.rb

@@ -232,6 +232,7 @@ Rails.application.routes.draw do
   # ----------------------------------------------------------------------
   # Routes for external service verifications
   get 'apple-app-site-association' => 'apple_app#site_association'
+  get '.well-known/assetlinks.json' => 'android_app#assetlinks'
 
   # ----------------------------------------------------------------------
   # Internal Monitoring Routes

spec/controllers/android_assetlinks_spec.rb

@@ -0,0 +1,10 @@
+require 'rails_helper'
+
+describe '.well-known/assetlinks.json', type: :request do
+  describe 'GET /.well-known/assetlinks.json' do
+    it 'successfully retrieves assetlinks.json file' do
+      get '/.well-known/assetlinks.json'
+      expect(response).to have_http_status(:success)
+    end
+  end
+end