feat(network): Implement HTTP Caching

Author: menny

gradle/libs.versions.toml

@@ -15,6 +15,7 @@ turbine = "0.12.1"
 retrofit = "2.11.0"
 okhttp = "4.12.0"
 moshi = "1.15.1"
+androidx_annotation = "1.8.0"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -36,9 +37,10 @@ okhttp = { group = "com.squareup.okhttp3", name = "okhttp", version.ref = "okhtt
 okhttp-logging-interceptor = { group = "com.squareup.okhttp3", name = "logging-interceptor", version.ref = "okhttp" }
 moshi = { group = "com.squareup.moshi", name = "moshi", version.ref = "moshi" }
 moshi-kotlin = { group = "com.squareup.moshi", name = "moshi-kotlin", version.ref = "moshi" }
+androidx-annotation = { group = "androidx.annotation", name = "annotation", version.ref = "androidx_annotation" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "android_gradle_plugin" }
 android-library = { id = "com.android.library", version.ref = "android_gradle_plugin" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin_gradle_plugin" }
-ksp = { id = "com.google.devtools.ksp", version.ref = "ksp_gradle_plugin" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp_gradle_plugin" }

network/build.gradle.kts

@@ -39,6 +39,7 @@ dependencies {
     implementation(libs.okhttp.logging.interceptor)
     implementation(libs.moshi)
     implementation(libs.moshi.kotlin)
+    implementation(libs.androidx.annotation)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.test.ext.junit)
     androidTestImplementation(libs.androidx.test.espresso.core)

network/src/main/java/com/anysoftkeyboard/janus/network/WikipediaClient.kt

@@ -1,21 +1,28 @@
 package com.anysoftkeyboard.janus.network
 
+import android.content.Context
 import com.squareup.moshi.Moshi
 import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
+import okhttp3.Cache
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
 import retrofit2.Retrofit
 import retrofit2.converter.moshi.MoshiConverterFactory
+import java.io.File
 
-object WikipediaClient {
-    private const val BASE_URL = "https://en.wikipedia.org/w/"
+class WikipediaClient(context: Context) {
+    private val BASE_URL = "https://en.wikipedia.org/w/"
+    private val CACHE_SIZE = 10 * 1024 * 1024L // 10 MB
 
     private val moshi = Moshi.Builder()
         .add(KotlinJsonAdapterFactory())
         .build()
 
+    private val cache = Cache(File(context.cacheDir, "http-cache"), CACHE_SIZE)
+
     private val okHttpClient = OkHttpClient.Builder()
         .addInterceptor(HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
+        .cache(cache)
         .build()
 
     val api: WikipediaApi by lazy {