Merge pull request #4 from fdoxyz/aasa-support

Direct AASA Support

.github/workflows/ci.yml

@@ -1,6 +1,8 @@
 name: CI
 on:
   push:
+    branches:
+      - main
   pull_request:
     branches:
       - main
@@ -14,7 +16,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0.0
+          ruby-version: 3.0.2
       - name: Install dependencies
         run: bundle install
       - name: Run tests

.ruby-version

@@ -1 +1 @@
-3.0.0
+3.0.2

Gemfile.lock

@@ -82,7 +82,7 @@ DEPENDENCIES
   sinatra-reloader (~> 1.0)
 
 RUBY VERSION
-   ruby 3.0.0p0
+   ruby 3.0.2p107
 
 BUNDLED WITH
-   2.2.15
+   2.2.22

README.md

@@ -8,7 +8,7 @@ The server is hosted at [`https://udl.visualcosita.com`](https://udl.visualcosit
 
 ## How it works, and why?
 
-It's a dead simple pivot server that will redirect to whatever you pass in the `r` query param to the root path.
+It's a dead simple pivot server that will allow for Universal Links to work with you app.
 
 Modern mobile browsers provide developers with [Universal Links (iOS)](https://developer.apple.com/library/archive/documentation/General/Conceptual/AppSearch/UniversalLinks.html) or [Android Intents](https://developer.chrome.com/docs/multidevice/android/intents/) to support deep linking users from a website directly into a mobile app. However, Operating Systems currently won't trigger these features when the user clicks a link within the same domain or when the user types the URL directly in the address bar.
 
@@ -28,6 +28,10 @@ Power users will likely need better reliability and scalability than a free serv
    - `git remote add upstream [email protected]:fdoxyz/udl-server.git`
    - `git pull upstream main`
    - `git push origin main`
+1. Configure `AASA_APP_ID` ENV variable to match your App Id
+   - Use the team ID or app ID prefix, followed by the bundle ID (joined by a dot `.`).
+   - This will allow your UDL Server to directly serve as a Universal Link target for your app and improve the experience
+   - Example: `R9SWHSQNV8.com.forem.app`
 
 ## Throttling, Safelist and Blocklist
 

server.rb

@@ -6,14 +6,15 @@
 end
 
 require 'uri'
+require 'json'
 require 'redis-activesupport'
 require 'rack/attack'
 
-if ENV['REDIS_URL'].present?
-  Rack::Attack.cache.store = ActiveSupport::Cache.lookup_store :redis_store
+Rack::Attack.cache.store = ActiveSupport::Cache.lookup_store :redis_store
 
-  limit = (ENV['UDL_THROTTLE_LIMIT'] || 3).to_i
-  period = (ENV['UDL_THROTTLE_PERIOD'] || 10).to_i
+if ENV['UDL_THROTTLE_LIMIT'].present? && ENV['UDL_THROTTLE_PERIOD'].present?
+  limit = ENV['UDL_THROTTLE_LIMIT'].to_i
+  period = ENV['UDL_THROTTLE_PERIOD'].to_i
   Rack::Attack.throttle('requests/ip', limit: limit, period: period) do |request|
     request.ip
   end
@@ -45,6 +46,33 @@
   end
 end
 
+get '/.well-known/apple-app-site-association' do
+  aasa_app_id = ENV['AASA_APP_ID'].to_s
+  content_type :json
+  {
+    "applinks": {
+      "apps": [],
+      "details":[
+        {
+          "appID": aasa_app_id,
+          "paths": ["/*"]
+        }
+      ]
+    },
+    "activitycontinuation": {
+      "apps": [aasa_app_id]
+    }
+  }.to_json
+end
+
 get '/*' do
-  erb :fallback
+  begin
+    target_url = URI(params['splat'].first)
+    raise 'Invalid redirect URL' if target_url.host != request.host
+    redirect target_url
+  rescue => error
+    @error = error
+    logger.info @error.inspect
+    erb :fallback
+  end
 end