From 2b6fe2179248537f092d2b44ed48c603671e5cdf Mon Sep 17 00:00:00 2001
From: Pierre HUBERT <pierre.git@communiquons.org>
Date: Wed, 16 Feb 2022 10:52:58 +0100
Subject: [PATCH] Parse input certificates

---
 app/build.gradle                              | 14 ++++++++
 app/src/main/AndroidManifest.xml              | 18 ++++++++--
 .../communiquons/dccaggregator/Constants.kt   |  4 +++
 .../dccaggregator/activities/CertsManager.kt  | 33 ++++++++++++++++++-
 .../dccaggregator/models/Certificate.kt       | 27 +++++++++++++++
 app/src/main/res/values/strings.xml           |  2 ++
 build.gradle                                  |  1 +
 settings.gradle                               |  1 +
 8 files changed, 97 insertions(+), 3 deletions(-)
 create mode 100644 app/src/main/java/org/communiquons/dccaggregator/Constants.kt
 create mode 100644 app/src/main/java/org/communiquons/dccaggregator/models/Certificate.kt

diff --git a/app/build.gradle b/app/build.gradle
index 3c77a69..094fc5e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -23,6 +23,8 @@ android {
         }
     }
     compileOptions {
+        coreLibraryDesugaringEnabled = true
+
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
@@ -33,6 +35,15 @@ android {
     buildFeatures {
         viewBinding = true
     }
+
+    packagingOptions {
+        pickFirst 'META-INF/ASL-2.0.txt'
+        pickFirst 'draftv4/schema'
+        pickFirst 'draftv3/schema'
+        pickFirst 'META-INF/LGPL-3.0.txt'
+    }
+
+    kotlinOptions.freeCompilerArgs += "-Xopt-in=kotlin.RequiresOptIn"
 }
 
 dependencies {
@@ -42,8 +53,11 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
     implementation 'androidx.preference:preference:1.2.0'
     implementation 'com.journeyapps:zxing-android-embedded:4.3.0'
+    implementation 'com.github.eu-digital-green-certificates:dgca-app-core-android:e4ad73eef8'
+    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.1'
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
 
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:1.1.5")
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index e8dc064..10b3117 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -29,8 +29,22 @@
         <!-- Manage certificates -->
         <activity
             android:name=".activities.CertsManager"
-            android:exported="false"
-            android:label="@string/activity_certsmanagers" />
+            android:exported="true"
+            android:label="@string/activity_certsmanagers">
+
+            <intent-filter android:label="@string/action_import_certificate">
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data
+                    android:host="bonjour.tousanticovid.gouv.fr"
+                    android:pathPrefix="/app/walletdcc"
+                    android:scheme="https" />
+            </intent-filter>
+
+        </activity>
 
         <!-- Fix Qr scanner orientation -->
         <activity
diff --git a/app/src/main/java/org/communiquons/dccaggregator/Constants.kt b/app/src/main/java/org/communiquons/dccaggregator/Constants.kt
new file mode 100644
index 0000000..35f0f2c
--- /dev/null
+++ b/app/src/main/java/org/communiquons/dccaggregator/Constants.kt
@@ -0,0 +1,4 @@
+package org.communiquons.dccaggregator
+
+// Official URL provided to add certificate to wallet
+const val WALLET_URL = "https://bonjour.tousanticovid.gouv.fr/app/walletdcc#"
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt b/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt
index 26f4561..ef0d699 100644
--- a/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt
+++ b/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt
@@ -3,11 +3,16 @@ package org.communiquons.dccaggregator.activities
 import android.os.Bundle
 import android.util.Log
 import android.view.MenuItem
+import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import com.journeyapps.barcodescanner.ScanContract
 import com.journeyapps.barcodescanner.ScanOptions
 import org.communiquons.dccaggregator.R
+import org.communiquons.dccaggregator.WALLET_URL
 import org.communiquons.dccaggregator.databinding.ActivityCertsManagerBinding
+import org.communiquons.dccaggregator.models.Certificate
+import java.net.URLDecoder
+import java.nio.charset.StandardCharsets
 
 class CertsManager : AppCompatActivity() {
 
@@ -25,6 +30,12 @@ class CertsManager : AppCompatActivity() {
         binding.scanCertButton.setOnClickListener {
             addNewCertificate()
         }
+
+
+        intent?.dataString.toString().apply {
+            if (this.startsWith(WALLET_URL))
+                processGivenCertificate(this)
+        }
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
@@ -40,7 +51,7 @@ class CertsManager : AppCompatActivity() {
         if (it.contents == null)
             return@registerForActivityResult
 
-        Log.v(TAG, it.contents)
+        processGivenCertificate(it.contents)
     }
 
     private fun addNewCertificate() {
@@ -50,4 +61,24 @@ class CertsManager : AppCompatActivity() {
             setPrompt(resources.getString(R.string.scan_qr_prompt))
         })
     }
+
+    private fun processGivenCertificate(input: String) {
+        // Decode input if required
+        val decoded = if (input.startsWith(WALLET_URL)) {
+            URLDecoder.decode(input.replace(WALLET_URL, ""), StandardCharsets.UTF_8.displayName())
+        } else {
+            input
+        }
+
+        try {
+            val cert = Certificate(decoded)
+
+            Log.v(TAG, cert.fullName)
+
+        } catch (e: Exception) {
+            e.printStackTrace()
+            Toast.makeText(this, R.string.invalid_certificate, Toast.LENGTH_SHORT).show()
+            return
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/models/Certificate.kt b/app/src/main/java/org/communiquons/dccaggregator/models/Certificate.kt
new file mode 100644
index 0000000..f6a241c
--- /dev/null
+++ b/app/src/main/java/org/communiquons/dccaggregator/models/Certificate.kt
@@ -0,0 +1,27 @@
+package org.communiquons.dccaggregator.models
+
+import dgca.verifier.app.decoder.CertificateDecodingResult
+import dgca.verifier.app.decoder.DefaultCertificateDecoder
+import dgca.verifier.app.decoder.base45.Base45Decoder
+import dgca.verifier.app.decoder.model.GreenCertificate
+
+@OptIn(ExperimentalUnsignedTypes::class)
+class Certificate(val encoded: String) {
+
+    // Decoded green certificate
+    val decoded: GreenCertificate;
+
+    init {
+        val res = DefaultCertificateDecoder(Base45Decoder()).decodeCertificate(encoded)
+
+        if (res is CertificateDecodingResult.Error)
+            throw Exception("Failed to read certificate!", res.error.error)
+
+        decoded = (res as CertificateDecodingResult.Success).greenCertificate
+    }
+
+    /**
+     * Get person full name
+     */
+    val fullName get() = "${decoded.person.standardisedGivenName} ${decoded.person.standardisedFamilyName}"
+}
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 06ea874..8904fd6 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -3,4 +3,6 @@
     <string name="activity_certsmanagers">Input certificates</string>
     <string name="add_certificate">Add a new certificate</string>
     <string name="scan_qr_prompt">Please present the QrCode of the certificate you want to add</string>
+    <string name="action_import_certificate">Import certificate</string>
+    <string name="invalid_certificate">The given certificate could not be decoded!</string>
 </resources>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index fcb3742..48c7db4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,6 +3,7 @@ buildscript {
     repositories {
         google()
         mavenCentral()
+        maven { url 'https://jitpack.io' }
     }
     dependencies {
         classpath "com.android.tools.build:gradle:7.0.4"
diff --git a/settings.gradle b/settings.gradle
index 3df71c9..706506c 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -3,6 +3,7 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
+        maven { url 'https://jitpack.io' }
         jcenter() // Warning: this repository is going to shut down soon
     }
 }