Automatically prepend instance domain name, when domain name is omitted for images. Fixes very edge case when proxy base url is NULL

app/build.gradle

@@ -162,6 +162,7 @@ dependencies {
 
     implementation "com.github.bumptech.glide:glide:$glideVersion"
     implementation "com.github.bumptech.glide:okhttp3-integration:$glideVersion"
+    kapt "com.github.bumptech.glide:compiler:$glideVersion"
 
     implementation "io.reactivex.rxjava2:rxjava:2.2.20"
     implementation "io.reactivex.rxjava2:rxandroid:2.1.1"

app/src/main/java/com/keylesspalace/tusky/di/AppComponent.kt

@@ -36,7 +36,8 @@ import javax.inject.Singleton
     BroadcastReceiverModule::class,
     ViewModelModule::class,
     RepositoryModule::class,
-    MediaUploaderModule::class
+    MediaUploaderModule::class,
+    GlideModule::class
 ])
 interface AppComponent {
     @Component.Builder

app/src/main/java/com/keylesspalace/tusky/di/GlideModule.kt

@@ -0,0 +1,12 @@
+package com.keylesspalace.tusky.di
+
+import com.keylesspalace.tusky.util.OmittedDomainAppModule
+import dagger.Module
+import dagger.android.ContributesAndroidInjector
+
+@Module
+abstract class GlideModule {
+    @ContributesAndroidInjector
+    abstract fun provideOmittedDomainAppModule() : OmittedDomainAppModule
+
+}

app/src/main/java/com/keylesspalace/tusky/util/OmittedDomainFetcher.kt

@@ -0,0 +1,60 @@
+package com.keylesspalace.tusky.util
+
+import android.content.Context
+import android.util.Log
+import com.bumptech.glide.Glide
+import com.bumptech.glide.Registry
+import com.bumptech.glide.annotation.GlideModule
+import com.bumptech.glide.load.Options
+import com.bumptech.glide.load.data.HttpUrlFetcher
+import com.bumptech.glide.load.model.GlideUrl
+import com.bumptech.glide.load.model.ModelLoader
+import com.bumptech.glide.load.model.ModelLoaderFactory
+import com.bumptech.glide.load.model.MultiModelLoaderFactory
+import com.bumptech.glide.load.model.stream.HttpGlideUrlLoader
+import com.bumptech.glide.module.AppGlideModule
+import com.bumptech.glide.signature.ObjectKey
+import com.keylesspalace.tusky.TuskyApplication
+import com.keylesspalace.tusky.db.AccountManager
+import java.io.File
+import java.io.InputStream
+import javax.inject.Inject
+
+@GlideModule
+class OmittedDomainAppModule : AppGlideModule() {
+    @Inject
+    lateinit var accountManager : AccountManager
+
+    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
+        Log.d("OmittedDomainAppModule", "registering loader factory")
+
+        (context.applicationContext as TuskyApplication).androidInjector.inject(this)
+
+        registry.append(String::class.java, InputStream::class.java, OmittedDomainLoaderFactory(accountManager))
+    }
+}
+
+class OmittedDomainLoaderFactory(val accountManager: AccountManager) : ModelLoaderFactory<String, InputStream> {
+    override fun teardown() = Unit
+
+    override fun build(factory: MultiModelLoaderFactory): ModelLoader<String, InputStream> = OmittedDomainLoader(accountManager)
+}
+
+class OmittedDomainLoader(val accountManager: AccountManager) : ModelLoader<String, InputStream> {
+    override fun buildLoadData(model: String, width: Int, height: Int, options: Options): ModelLoader.LoadData<InputStream>?
+    {
+        val trueUrl = if(accountManager.activeAccount != null)
+            "https://" + accountManager.activeAccount!!.domain + model
+        else model
+
+        val timeout = options.get(HttpGlideUrlLoader.TIMEOUT) ?: 100
+
+        return ModelLoader.LoadData(ObjectKey(model), HttpUrlFetcher(GlideUrl(trueUrl), timeout))
+    }
+
+
+    override fun handles(model: String): Boolean {
+        val file = File(model)
+        return !file.exists()
+    }
+}