Enable code minification for release builds of all apps

Attention: This brings a high run-time crash risk.
So all release builds need to be thoroughly tested before publication.
Nightly builds have been switched to release builds for that reason.

10 files changed, 31 insertions, 5 deletions

diff --git a/cashier/.gitlab-ci.yml b/cashier/.gitlab-ci.yml
index 6b73dee..cbf2bf0 100644
--- a/cashier/.gitlab-ci.yml
+++ b/cashier/.gitlab-ci.yml
@@ -36,7 +36,7 @@ cashier_deploy_nightly:
     # Set nightly application ID
     - sed -i "s,^\(\s*applicationId\) \"*[a-z\.].*\",\1 \"net.taler.cashier.nightly\"," cashier/build.gradle
     # Build the APK
-    - ./gradlew :cashier:assembleDebug
+    - ./gradlew :cashier:assembleRelease
     # START only needed while patch not accepted/released upstream
     - apt update && apt install patch
     - patch /usr/lib/python3/dist-packages/fdroidserver/nightly.py nightly-stats.patch
diff --git a/cashier/build.gradle b/cashier/build.gradle
index e443944..341562d 100644
--- a/cashier/build.gradle
+++ b/cashier/build.gradle
@@ -35,7 +35,7 @@ android {
 
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
diff --git a/cashier/proguard-rules.pro b/cashier/proguard-rules.pro
index f1b4245..f612b29 100644
--- a/cashier/proguard-rules.pro
+++ b/cashier/proguard-rules.pro
@@ -19,3 +19,7 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+
+# androidx.security:security-crypto
+# https://github.com/google/tink/issues/361
+-keep class * extends com.google.crypto.tink.shaded.protobuf.GeneratedMessageLite { *; }
diff --git a/merchant-lib/consumer-rules.pro b/merchant-lib/consumer-rules.pro
index e69de29..dc239e6 100644
--- a/merchant-lib/consumer-rules.pro
+++ b/merchant-lib/consumer-rules.pro
@@ -0,0 +1 @@
+-keep class net.taler.merchantlib.** {*;}
diff --git a/merchant-terminal/.gitlab-ci.yml b/merchant-terminal/.gitlab-ci.yml
index d159902..470cb58 100644
--- a/merchant-terminal/.gitlab-ci.yml
+++ b/merchant-terminal/.gitlab-ci.yml
@@ -38,7 +38,7 @@ merchant_deploy_nightly:
     # Set nightly application ID
     - sed -i "s,^\(\s*applicationId\) \"*[a-z\.].*\",\1 \"net.taler.merchantpos.nightly\"," merchant-terminal/build.gradle
     # Build the APK
-    - ./gradlew :merchant-terminal:assembleDebug
+    - ./gradlew :merchant-terminal:assembleRelease
     # START only needed while patch not accepted/released upstream
     - apt update && apt install patch
     - patch /usr/lib/python3/dist-packages/fdroidserver/nightly.py nightly-stats.patch
diff --git a/merchant-terminal/proguard-rules.pro b/merchant-terminal/proguard-rules.pro
index f1b4245..1a50a50 100644
--- a/merchant-terminal/proguard-rules.pro
+++ b/merchant-terminal/proguard-rules.pro
@@ -19,3 +19,5 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+
+-keep class net.taler.merchantpos.** {*;}
diff --git a/taler-kotlin-android/consumer-rules.pro b/taler-kotlin-android/consumer-rules.pro
index e69de29..854cdfd 100644
--- a/taler-kotlin-android/consumer-rules.pro
+++ b/taler-kotlin-android/consumer-rules.pro
@@ -0,0 +1,15 @@
+-dontobfuscate
+
+# This is broad, but better leave a few common class and still optimize the rest out
+-keep class net.taler.common.** {*;}
+
+# AndroidX navigation
+-keepnames class androidx.navigation.fragment.NavHostFragment
+
+# Jackson serialization
+-keep class kotlin.Metadata { *; }
+-keep class kotlin.reflect.** { *; }
+
+# KotlinX serialization
+-keepattributes *Annotation*, InnerClasses
+-dontnote kotlinx.serialization.SerializationKt
diff --git a/wallet/.gitlab-ci.yml b/wallet/.gitlab-ci.yml
index c417aa9..42f561d 100644
--- a/wallet/.gitlab-ci.yml
+++ b/wallet/.gitlab-ci.yml
@@ -25,7 +25,7 @@ wallet_deploy_nightly:
     # Ensure that key exists
     - test -z "$DEBUG_KEYSTORE" && exit 0
     # Build the APK
-    - ./gradlew :wallet:assembleNightlyDebug
+    - ./gradlew :wallet:assembleNightlyRelease
     # START only needed while patch not accepted/released upstream
     - apt update && apt install patch
     - patch -b /usr/lib/python3/dist-packages/fdroidserver/nightly.py nightly-stats.patch
diff --git a/wallet/build.gradle b/wallet/build.gradle
index 1761018..93eef05 100644
--- a/wallet/build.gradle
+++ b/wallet/build.gradle
@@ -53,7 +53,7 @@ android {
     }
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
diff --git a/wallet/proguard-rules.pro b/wallet/proguard-rules.pro
index f1b4245..27f3799 100644
--- a/wallet/proguard-rules.pro
+++ b/wallet/proguard-rules.pro
@@ -19,3 +19,7 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+
+-keep class akono.AkonoJni {*;}
+
+-keep class net.taler.wallet.** {*;}