Add staging build variant, move staging URL out of source control

Change-Id: I9388f8d2adc4800749fc7e5e79c2d165938401c4

app/build.gradle.kts

@@ -37,6 +37,9 @@ android {
     }
 
     buildTypes {
+        val debug by getting {
+            applicationIdSuffix = ".debug"
+        }
         val release by getting {
             isMinifyEnabled = true
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
@@ -47,6 +50,12 @@ android {
             matchingFallbacks.add("release")
             proguardFiles("benchmark-rules.pro")
         }
+        val staging by creating {
+            initWith(debug)
+            signingConfig = signingConfigs.getByName("debug")
+            matchingFallbacks.add("debug")
+            applicationIdSuffix = ".staging"
+        }
     }
     packagingOptions {
         resources {

build.gradle.kts

@@ -25,5 +25,6 @@ buildscript {
         classpath(libs.kotlin.gradlePlugin)
         classpath(libs.kotlin.serializationPlugin)
         classpath(libs.hilt.gradlePlugin)
+        classpath(libs.secrets.gradlePlugin)
     }
 }

core-network/build.gradle.kts

@@ -20,6 +20,27 @@ plugins {
     id("kotlinx-serialization")
     id("dagger.hilt.android.plugin")
     id("nowinandroid.spotless")
+    id("com.google.android.libraries.mapsplatform.secrets-gradle-plugin")
+}
+
+android {
+    buildTypes {
+        val staging by creating {
+            initWith(getByName("debug"))
+            matchingFallbacks.add("debug")
+        }
+    }
+    // Force the staging variant to use the release source directory. This is necessary so that the
+    // staging variant uses the remote network.
+    sourceSets {
+        getByName("staging") {
+            java.srcDir("src/release/java")
+        }
+    }
+}
+
+secrets {
+    defaultPropertiesFileName = "secrets.defaults.properties"
 }
 
 dependencies {

core-network/src/debug/java/com/google/samples/apps/nowinandroid/core/network/di/NetworkModule.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.network.di
+
+import com.google.samples.apps.nowinandroid.core.network.NiANetwork
+import com.google.samples.apps.nowinandroid.core.network.fake.FakeNiANetwork
+import dagger.Binds
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+import kotlinx.serialization.json.Json
+
+@Module
+@InstallIn(SingletonComponent::class)
+interface NetworkModule {
+
+    @Binds
+    fun bindsNiANetwork(
+        niANetwork: FakeNiANetwork
+    ): NiANetwork
+
+    companion object {
+        @Provides
+        @Singleton
+        fun providesNetworkJson(): Json = Json {
+            ignoreUnknownKeys = true
+        }
+    }
+}

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/retrofit/RetrofitNiANetwork.kt

@@ -16,6 +16,7 @@
 
 package com.google.samples.apps.nowinandroid.core.network.retrofit
 
+import com.google.samples.apps.nowinandroid.core.network.BuildConfig
 import com.google.samples.apps.nowinandroid.core.network.NiANetwork
 import com.google.samples.apps.nowinandroid.core.network.model.NetworkAuthor
 import com.google.samples.apps.nowinandroid.core.network.model.NetworkChangeList
@@ -68,7 +69,7 @@ private interface RetrofitNiANetworkApi {
     ): List<NetworkChangeList>
 }
 
-private const val NiABaseUrl = "https://staging-url.com/"
+private const val NiABaseUrl = BuildConfig.BACKEND_URL
 
 /**
  * Wrapper for data provided from the [NiABaseUrl]

gradle/libs.versions.toml

@@ -41,6 +41,7 @@ protobufPlugin = "0.8.18"
 retrofit = "2.9.0"
 retrofitKotlinxSerializationJson = "0.8.0"
 room = "2.4.1"
+secrets = "2.0.1"
 spotless = "6.3.0"
 turbine = "0.7.0"
 
@@ -108,6 +109,7 @@ retrofit-kotlin-serialization = { group = "com.jakewharton.retrofit", name = "re
 room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
 room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
 room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
+secrets-gradlePlugin = { group = "com.google.android.libraries.mapsplatform.secrets-gradle-plugin", name = "secrets-gradle-plugin", version.ref = "secrets" }
 spotless-gradlePlugin = { group = "com.diffplug.spotless", name = "spotless-plugin-gradle", version.ref = "spotless" }
 
 [plugins]

secrets.defaults.properties

@@ -0,0 +1,4 @@
+## This file provides default values to modules using the secrets-gradle-plugin. It is necessary
+# because the secrets properties file is not under source control so CI builds will fail without
+# default values.
+BACKEND_URL="http://example.com"