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Extract blob download in iframes logic to make it reusable
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app/src/main/java/com/duckduckgo/app/browser/WebViewSafeMessageListening.kt
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...l-impl/src/main/java/com/duckduckgo/autofill/impl/importing/blob/WebViewBlobDownloader.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| /* | ||
| * Copyright (c) 2024 DuckDuckGo | ||
| * | ||
| * 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 | ||
| * | ||
| * http://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.duckduckgo.autofill.impl.importing.blob | ||
|
|
||
| import android.annotation.SuppressLint | ||
| import android.net.Uri | ||
| import android.webkit.WebView | ||
| import androidx.webkit.JavaScriptReplyProxy | ||
| import androidx.webkit.WebViewCompat | ||
| import com.duckduckgo.app.browser.api.WebViewCapabilityChecker | ||
| import com.duckduckgo.app.browser.api.WebViewCapabilityChecker.WebViewCapability | ||
| import com.duckduckgo.di.scopes.AppScope | ||
| import com.squareup.anvil.annotations.ContributesBinding | ||
| import javax.inject.Inject | ||
|
|
||
| /** | ||
| * This interface provides the ability to add modern blob download support to a WebView. | ||
| */ | ||
| interface WebViewBlobDownloader { | ||
|
|
||
| /** | ||
| * Configures a web view to support blob downloads, including in iframes. | ||
| */ | ||
| suspend fun addBlobDownloadSupport(webView: WebView) | ||
|
|
||
| /** | ||
| * Requests the WebView to convert a blob URL to a data URI. | ||
| */ | ||
| suspend fun convertBlobToDataUri(blobUrl: String) | ||
|
|
||
| /** | ||
| * Stores a reply proxy for a given location. | ||
| */ | ||
| suspend fun storeReplyProxy( | ||
| originUrl: String, | ||
| replyProxy: JavaScriptReplyProxy, | ||
| locationHref: String?, | ||
| ) | ||
|
|
||
| /** | ||
| * Clears any stored JavaScript reply proxies. | ||
| */ | ||
| fun clearReplyProxies() | ||
| } | ||
|
|
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| @ContributesBinding(AppScope::class) | ||
| class WebViewBlobDownloaderModernImpl @Inject constructor( | ||
| private val webViewCapabilityChecker: WebViewCapabilityChecker, | ||
| ) : WebViewBlobDownloader { | ||
|
|
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| // Map<String, Map<String, JavaScriptReplyProxy>>() = Map<Origin, Map<location.href, JavaScriptReplyProxy>>() | ||
| private val fixedReplyProxyMap = mutableMapOf<String, Map<String, JavaScriptReplyProxy>>() | ||
|
|
||
| @SuppressLint("RequiresFeature") | ||
| override suspend fun addBlobDownloadSupport(webView: WebView) { | ||
| if (isBlobDownloadWebViewFeatureEnabled()) { | ||
| WebViewCompat.addDocumentStartJavaScript(webView, script, setOf("*")) | ||
| } | ||
| } | ||
|
|
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| @SuppressLint("RequiresFeature") | ||
| override suspend fun convertBlobToDataUri(blobUrl: String) { | ||
| for ((key, proxies) in fixedReplyProxyMap) { | ||
| if (sameOrigin(blobUrl.removePrefix("blob:"), key)) { | ||
| for (replyProxy in proxies.values) { | ||
| replyProxy.postMessage(blobUrl) | ||
| } | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| override suspend fun storeReplyProxy( | ||
| originUrl: String, | ||
| replyProxy: JavaScriptReplyProxy, | ||
| locationHref: String?, | ||
| ) { | ||
| val frameProxies = fixedReplyProxyMap[originUrl]?.toMutableMap() ?: mutableMapOf() | ||
| // if location.href is not passed, we fall back to origin | ||
| val safeLocationHref = locationHref ?: originUrl | ||
| frameProxies[safeLocationHref] = replyProxy | ||
| fixedReplyProxyMap[originUrl] = frameProxies | ||
| } | ||
|
|
||
| private fun sameOrigin( | ||
| firstUrl: String, | ||
| secondUrl: String, | ||
| ): Boolean { | ||
| return kotlin.runCatching { | ||
| val firstUri = Uri.parse(firstUrl) | ||
| val secondUri = Uri.parse(secondUrl) | ||
|
|
||
| firstUri.host == secondUri.host && firstUri.scheme == secondUri.scheme && firstUri.port == secondUri.port | ||
| }.getOrNull() ?: return false | ||
| } | ||
|
|
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| override fun clearReplyProxies() { | ||
| fixedReplyProxyMap.clear() | ||
| } | ||
|
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| private suspend fun isBlobDownloadWebViewFeatureEnabled(): Boolean { | ||
| return webViewCapabilityChecker.isSupported(WebViewCapability.WebMessageListener) && | ||
| webViewCapabilityChecker.isSupported(WebViewCapability.DocumentStartJavaScript) | ||
| } | ||
|
|
||
| companion object { | ||
| private val script = """ | ||
| window.__url_to_blob_collection = {}; | ||
| const original_createObjectURL = URL.createObjectURL; | ||
| URL.createObjectURL = function () { | ||
| const blob = arguments[0]; | ||
| const url = original_createObjectURL.call(this, ...arguments); | ||
| if (blob instanceof Blob) { | ||
| __url_to_blob_collection[url] = blob; | ||
| } | ||
| return url; | ||
| } | ||
| function blobToBase64DataUrl(blob) { | ||
| return new Promise((resolve, reject) => { | ||
| const reader = new FileReader(); | ||
| reader.onloadend = function() { | ||
| resolve(reader.result); | ||
| } | ||
| reader.onerror = function() { | ||
| reject(new Error('Failed to read Blob object')); | ||
| } | ||
| reader.readAsDataURL(blob); | ||
| }); | ||
| } | ||
| const pingMessage = 'Ping:' + window.location.href | ||
| ddgBlobDownloadObj.postMessage(pingMessage) | ||
| ddgBlobDownloadObj.onmessage = function(event) { | ||
| if (event.data.startsWith('blob:')) { | ||
| const blob = window.__url_to_blob_collection[event.data]; | ||
| if (blob) { | ||
| blobToBase64DataUrl(blob).then((dataUrl) => { | ||
| ddgBlobDownloadObj.postMessage(dataUrl); | ||
| }); | ||
| } | ||
| } | ||
| } | ||
| """.trimIndent() | ||
| } | ||
| } |
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