feat: properly set OkHttp header (#2463)

properly send `User-Agent` and `Accept-Language` to `updateJson` server,
module developers can check `User-Agent` whether to send update to user
and set user preferred language for changelog.

also added cache to reduce update server load

manager/app/src/main/java/me/weishu/kernelsu/KernelSUApplication.kt

@@ -6,12 +6,25 @@ import coil.Coil
 import coil.ImageLoader
 import me.zhanghai.android.appiconloader.coil.AppIconFetcher
 import me.zhanghai.android.appiconloader.coil.AppIconKeyer
+import okhttp3.Cache
+import okhttp3.OkHttpClient
 import java.io.File
+import java.util.Locale
 
 lateinit var ksuApp: KernelSUApplication
 
 class KernelSUApplication : Application() {
 
+    val okhttpClient =
+        OkHttpClient.Builder().cache(Cache(File(cacheDir, "okhttp"), 10 * 1024 * 1024))
+            .addInterceptor { block ->
+                block.proceed(
+                    block.request().newBuilder()
+                        .header("User-Agent", "KernelSU/${BuildConfig.VERSION_CODE}")
+                        .header("Accept-Language", Locale.getDefault().toLanguageTag()).build()
+                )
+            }.build()
+
     override fun onCreate() {
         super.onCreate()
         ksuApp = this

manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Module.kt

@@ -92,6 +92,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import me.weishu.kernelsu.Natives
 import me.weishu.kernelsu.R
+import me.weishu.kernelsu.ksuApp
 import me.weishu.kernelsu.ui.component.ConfirmResult
 import me.weishu.kernelsu.ui.component.SearchAppBar
 import me.weishu.kernelsu.ui.component.rememberConfirmDialog
@@ -105,7 +106,6 @@ import me.weishu.kernelsu.ui.util.toggleModule
 import me.weishu.kernelsu.ui.util.uninstallModule
 import me.weishu.kernelsu.ui.viewmodel.ModuleViewModel
 import me.weishu.kernelsu.ui.webui.WebUIActivity
-import okhttp3.OkHttpClient
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Destination<RootGraph>
@@ -314,7 +314,7 @@ private fun ModuleList(
         val changelogResult = loadingDialog.withLoading {
             withContext(Dispatchers.IO) {
                 runCatching {
-                    OkHttpClient().newCall(
+                    ksuApp.okhttpClient.newCall(
                         okhttp3.Request.Builder().url(changelogUrl).build()
                     ).execute().body!!.string()
                 }

manager/app/src/main/java/me/weishu/kernelsu/ui/util/Downloader.kt

@@ -11,6 +11,7 @@ import android.os.Environment
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.core.content.ContextCompat
+import me.weishu.kernelsu.ksuApp
 import me.weishu.kernelsu.ui.util.module.LatestVersionInfo
 
 /**
@@ -66,7 +67,7 @@ fun checkNewVersion(): LatestVersionInfo {
     // default null value if failed
     val defaultValue = LatestVersionInfo()
     runCatching {
-        okhttp3.OkHttpClient().newCall(okhttp3.Request.Builder().url(url).build()).execute()
+        ksuApp.okhttpClient.newCall(okhttp3.Request.Builder().url(url).build()).execute()
             .use { response ->
                 if (!response.isSuccessful) {
                     return defaultValue

manager/app/src/main/java/me/weishu/kernelsu/ui/viewmodel/ModuleViewModel.kt

@@ -10,6 +10,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import me.weishu.kernelsu.ksuApp
 import me.weishu.kernelsu.ui.util.HanziToPinyin
 import me.weishu.kernelsu.ui.util.listModules
 import me.weishu.kernelsu.ui.util.overlayFsAvailable
@@ -137,11 +138,8 @@ class ModuleViewModel : ViewModel() {
         val result = kotlin.runCatching {
             val url = m.updateJson
             Log.i(TAG, "checkUpdate url: $url")
-            val response = okhttp3.OkHttpClient()
+            val response = ksuApp.okhttpClient.newCall(
-                .newCall(
+                    okhttp3.Request.Builder().url(url).build()
-                    okhttp3.Request.Builder()
-                        .url(url)
-                        .build()
                 ).execute()
             Log.d(TAG, "checkUpdate code: ${response.code}")
             if (response.isSuccessful) {

manager/app/src/main/java/me/weishu/kernelsu/ui/viewmodel/TemplateViewModel.kt

@@ -11,18 +11,17 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import kotlinx.parcelize.Parcelize
 import me.weishu.kernelsu.Natives
+import me.weishu.kernelsu.ksuApp
 import me.weishu.kernelsu.profile.Capabilities
 import me.weishu.kernelsu.profile.Groups
 import me.weishu.kernelsu.ui.util.getAppProfileTemplate
 import me.weishu.kernelsu.ui.util.listAppProfileTemplates
 import me.weishu.kernelsu.ui.util.setAppProfileTemplate
-import okhttp3.OkHttpClient
 import okhttp3.Request
 import org.json.JSONArray
 import org.json.JSONObject
 import java.text.Collator
 import java.util.Locale
-import java.util.concurrent.TimeUnit
 
 
 /**
@@ -138,13 +137,7 @@ class TemplateViewModel : ViewModel() {
 
 private fun fetchRemoteTemplates() {
     runCatching {
-        val client: OkHttpClient = OkHttpClient.Builder()
+        ksuApp.okhttpClient.newCall(
-            .connectTimeout(5, TimeUnit.SECONDS)
-            .writeTimeout(5, TimeUnit.SECONDS)
-            .readTimeout(10, TimeUnit.SECONDS)
-            .build()
-
-        client.newCall(
             Request.Builder().url(TEMPLATE_INDEX_URL).build()
         ).execute().use { response ->
             if (!response.isSuccessful) {
@@ -155,7 +148,7 @@ private fun fetchRemoteTemplates() {
             0.until(remoteTemplateIds.length()).forEach { i ->
                 val id = remoteTemplateIds.getString(i)
                 Log.i(TAG, "fetch template: $id")
-                val templateJson = client.newCall(
+                val templateJson = ksuApp.okhttpClient.newCall(
                     Request.Builder().url(TEMPLATE_URL.format(id)).build()
                 ).runCatching {
                     execute().use { response ->