/applink_test

Primary LanguageKotlin

y Introduction

This is a very simple app with just three activities, for testing app links.

There is already a prepared json file on my own host applinks.cmds.dev.

Installation

  • Build this app by Android Studio

a successful installation of this app will give log

I/IntentFilterIntentOp: Verifying IntentFilter. verificationId:4 scheme:"https" hosts:"applinks.cmds.dev" package:"net.julianchu.applinktest".
I/IntentFilterIntentOp: Verification 4 complete. Success:true. Failed hosts:.

Use this command to check verification

$ adb shell dumpsys package d

Use this command to test app-link. FirstActivity will be launched.

$ adb shell am start -a android.intent.action.VIEW -c android.intent.category.BROWSABLE  -d "https://applinks.cmds.dev/foobar"

Problem

The problem is Intent-filter-verifier won't execute anymore, if it has been passed once.

  • If your configuration of AndroidManifest.xml is incorrect, every re-installation will cause Intent-Fitler-Verifier execution, this is good.
  • If you pass verification for just ONCE. The verification won't be executed anymore, until you manually uninstall app. (which cause removing-data-of-app of course).
  • So far I have not idea whether is problem is due to adb install or not. Maybe it works well if upgrading an app via Google-play-store.
    • If so, this means we cannot do any reliable test in developemnt. :-/

Advance test

Since the verification won't be executed again, now we can corrupt the intent-filter

  1. change attribute android:host to any one you don't own, even line.me still works.
  2. Add new intent filter to another activity to handle app link, it also works.

How to reproduce

  1. build master branch and install app via adb, now it should pass intent-filter-verifier.

  2. check to hijack_app_link branch, build and install again.

    this branch added one more intent-filter to SecondActivity to handle 'google.com'. Of course I don't have access to the domain.

  3. open a link by sending intent, now SecondActivity will be launched.

    $ adb shell dumpsys package d  # the order of filters does matter. If this app is prior than other handler...then
$ adb shell am start -a android.intent.action.VIEW -c android.intent.category.BROWSABLE  -d "https://google.com"

You will see SecondActivity handled the intent.

Reference