feat: proxy media uploads through native delegate for processing

Package.swift

@@ -27,7 +27,7 @@ let package = Package(
     targets: [
         .target(
             name: "GutenbergKit",
-            dependencies: ["SwiftSoup", "SVGView", "GutenbergKitResources"],
+            dependencies: ["SwiftSoup", "SVGView", "GutenbergKitResources", "GutenbergKitHTTP"],
             path: "ios/Sources/GutenbergKit",
             exclude: ["Gutenberg"],
             packageAccess: false

android/Gutenberg/build.gradle.kts

@@ -77,6 +77,7 @@ dependencies {
     implementation(libs.jsoup)
     implementation(libs.okhttp)
 
+    testImplementation(libs.json)
     testImplementation(libs.junit)
     testImplementation(kotlin("test"))
     testImplementation(libs.kotlinx.coroutines.test)

android/Gutenberg/src/main/java/org/wordpress/gutenberg/GutenbergView.kt

@@ -105,6 +105,25 @@ class GutenbergView : WebView {
 
     var requestInterceptor: GutenbergRequestInterceptor = DefaultGutenbergRequestInterceptor()
 
+    /** Optional delegate for customizing media upload behavior (resize, transcode, custom upload). */
+    var mediaUploadDelegate: MediaUploadDelegate? = null
+        set(value) {
+            if (field === value) return
+            field = value
+            // Stop any previously running server before starting a new one.
+            uploadServer?.stop()
+            uploadServer = null
+            // (Re)start the upload server so it captures the delegate.
+            // This handles the common case where the delegate is set after
+            // construction but before the editor finishes loading.
+            if (value != null) {
+                startUploadServer()
+            }
+        }
+
+    private var uploadServer: MediaUploadServer? = null
+    private val uploadHttpClient: okhttp3.OkHttpClient by lazy { okhttp3.OkHttpClient() }
+
     private var onFileChooserRequested: ((Intent, Int) -> Unit)? = null
     private var contentChangeListener: ContentChangeListener? = null
     private var historyChangeListener: HistoryChangeListener? = null
@@ -441,7 +460,12 @@ class GutenbergView : WebView {
     }
 
     private fun setGlobalJavaScriptVariables() {
-        val gbKit = GBKitGlobal.fromConfiguration(configuration, dependencies)
+        val gbKit = GBKitGlobal.fromConfiguration(
+            configuration,
+            dependencies,
+            nativeUploadPort = uploadServer?.port,
+            nativeUploadToken = uploadServer?.token
+        )
         val gbKitJson = gbKit.toJsonString()
         val gbKitConfig = """
             window.GBKit = $gbKitJson;
@@ -452,6 +476,26 @@ class GutenbergView : WebView {
     }
 
 
+    private fun startUploadServer() {
+        if (configuration.siteApiRoot.isEmpty() || configuration.authHeader.isEmpty()) return
+
+        try {
+            val defaultUploader = DefaultMediaUploader(
+                httpClient = uploadHttpClient,
+                siteApiRoot = configuration.siteApiRoot,
+                authHeader = configuration.authHeader,
+                siteApiNamespace = configuration.siteApiNamespace.toList()
+            )
+            uploadServer = MediaUploadServer(
+                uploadDelegate = mediaUploadDelegate,
+                defaultUploader = defaultUploader,
+                cacheDir = context.cacheDir
+            )
+        } catch (e: Exception) {
+            Log.w(TAG, "Failed to start upload server", e)
+        }
+    }
+
     fun clearConfig() {
         val jsCode = """
             delete window.GBKit;
@@ -879,6 +923,8 @@ class GutenbergView : WebView {
     override fun onDetachedFromWindow() {
         super.onDetachedFromWindow()
         stopNetworkMonitoring()
+        uploadServer?.stop()
+        uploadServer = null
         clearConfig()
         this.stopLoading()
         FileCache.clearCache(context)
@@ -944,6 +990,8 @@ class GutenbergView : WebView {
     }
 
     companion object {
+        private const val TAG = "GutenbergView"
+
         /** Hosts that are safe to serve assets over HTTP (local development only). */
         private val LOCAL_HOSTS = setOf("localhost", "127.0.0.1", "10.0.2.2")