Take Murmur2 hash of untransformed icon when creating WebAPK part 2/2

chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/webapk/manifest_upgrade_detector_fetcher.h"
 
 #include <jni.h>
 #include <vector>
 
 #include "base/android/jni_string.h"
 #include "chrome/browser/android/shortcut_helper.h"
-#include "chrome/browser/android/shortcut_info.h"
+#include "chrome/browser/android/webapk/webapk_icon_hasher.h"
 #include "chrome/browser/android/webapk/webapk_web_manifest_checker.h"
 #include "chrome/browser/installable/installable_manager.h"
+#include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/manifest.h"
 #include "jni/ManifestUpgradeDetectorFetcher_jni.h"
 #include "third_party/smhasher/src/MurmurHash2.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "url/gurl.h"
 
 using base::android::JavaParamRef;
 using base::android::ScopedJavaLocalRef;
 
 namespace {
 
-// The seed to use for the murmur2 hash.
-const uint64_t kMurmur2HashSeed = 0;
-
-// Computes a murmur2 hash of |bitmap|'s PNG encoded bytes.
-uint64_t ComputeBitmapHash(const SkBitmap& bitmap) {
-  std::vector<unsigned char> png_bytes;
-  gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &png_bytes);
-  return MurmurHash64B(&png_bytes.front(), png_bytes.size(), kMurmur2HashSeed);
-}
-
 // Returns whether the given |url| is within the scope of the |scope| url.
 bool IsInScope(const GURL& url, const GURL& scope) {
   return base::StartsWith(url.spec(), scope.spec(),
                          base::CompareCase::SENSITIVE);
 }
 
 }  // anonymous namespace
 
 jlong Initialize(JNIEnv* env,
                  const JavaParamRef<jobject>& obj,
                  const JavaParamRef<jstring>& java_scope_url,
                  const JavaParamRef<jstring>& java_web_manifest_url) {
   GURL scope(base::android::ConvertJavaStringToUTF8(env, java_scope_url));
   GURL web_manifest_url(base::android::ConvertJavaStringToUTF8(
       env, java_web_manifest_url));
   ManifestUpgradeDetectorFetcher* fetcher =
       new ManifestUpgradeDetectorFetcher(env, obj, scope, web_manifest_url);
   return reinterpret_cast<intptr_t>(fetcher);
 }
 
 ManifestUpgradeDetectorFetcher::ManifestUpgradeDetectorFetcher(
     JNIEnv* env,
     jobject obj,
     const GURL& scope,
     const GURL& web_manifest_url)
     : content::WebContentsObserver(nullptr),
       scope_(scope),
       web_manifest_url_(web_manifest_url),
+      info_(GURL()),
       weak_ptr_factory_(this) {
   java_ref_.Reset(env, obj);
 }
 
 ManifestUpgradeDetectorFetcher::~ManifestUpgradeDetectorFetcher() {
 }
 
 // static
 bool ManifestUpgradeDetectorFetcher::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
@@ skipping 52 matching lines @@
   // links to the Web Manifest that we are looking for.
   // If the manifest URL is different from the current one, we will continue
   // observing too. It is based on our assumption that it is invalid for
   // web developers to change the Web Manifest location. When it does
   // change, we will treat the new Web Manifest as the one of another WebAPK.
   if (data.manifest.IsEmpty() || web_manifest_url_ != data.manifest_url)
     return;
 
   // TODO(pkotwicz): Tell Java side that the Web Manifest was fetched but the
   // Web Manifest is not WebAPK-compatible. (http://crbug.com/639536)
-  if (!data.is_installable ||
+  if (data.error_code != NO_ERROR_DETECTED ||
       !AreWebManifestUrlsWebApkCompatible(data.manifest)) {
     return;
   }
 
-  ShortcutInfo info(GURL::EmptyGURL());
-  info.UpdateFromManifest(data.manifest);
-  info.manifest_url = data.manifest_url;
-  info.icon_url = data.icon_url;
-  OnDataAvailable(info, (data.icon ? *data.icon : SkBitmap()));
+  info_.UpdateFromManifest(data.manifest);
+  info_.manifest_url = data.manifest_url;
+  info_.icon_url = data.icon_url;
+  icon_ = *data.icon;
+
+  icon_hasher_.reset(new WebApkIconHasher());
+  Profile* profile =
+      Profile::FromBrowserContext(web_contents()->GetBrowserContext());
+  icon_hasher_->DownloadAndComputeMurmur2Hash(
+      profile->GetRequestContext(),
+      data.icon_url,
+      base::Bind(&ManifestUpgradeDetectorFetcher::OnGotIconMurmur2Hash,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void ManifestUpgradeDetectorFetcher::OnGotIconMurmur2Hash(
+    const std::string& icon_murmur2_hash) {
+  icon_hasher_.reset();
+
+  if (icon_murmur2_hash.empty()) {
+    // TODO(pkotwicz): Tell Java side that the Web Manifest was fetched but the
+    // Web Manifest is not WebAPK-compatible. (http://crbug.com/639536)
+    return;
+  }
+
+  OnDataAvailable(info_, icon_murmur2_hash, icon_);
 }
 
 void ManifestUpgradeDetectorFetcher::OnDataAvailable(
     const ShortcutInfo& info,
+    const std::string& icon_murmur2_hash,
     const SkBitmap& icon_bitmap) {
   JNIEnv* env = base::android::AttachCurrentThread();
 
   ScopedJavaLocalRef<jstring> java_url =
       base::android::ConvertUTF8ToJavaString(env, info.url.spec());
   ScopedJavaLocalRef<jstring> java_scope =
       base::android::ConvertUTF8ToJavaString(env, info.scope.spec());
   ScopedJavaLocalRef<jstring> java_name =
       base::android::ConvertUTF16ToJavaString(env, info.name);
   ScopedJavaLocalRef<jstring> java_short_name =
       base::android::ConvertUTF16ToJavaString(env, info.short_name);
   ScopedJavaLocalRef<jstring> java_icon_url =
       base::android::ConvertUTF8ToJavaString(env, info.icon_url.spec());
-  ScopedJavaLocalRef<jobject> java_bitmap;
-  uint64_t icon_murmur2_hash = 0;
-  if (icon_bitmap.getSize()) {
-    java_bitmap = gfx::ConvertToJavaBitmap(&icon_bitmap);
-    // TODO(pkotwicz): Get hash of untransformed icon's bytes (with no
-    // encoding/decoding).
-    icon_murmur2_hash = ComputeBitmapHash(icon_bitmap);
-  }
+  ScopedJavaLocalRef<jstring> java_icon_murmur2_hash =
+      base::android::ConvertUTF8ToJavaString(env, icon_murmur2_hash);
+  ScopedJavaLocalRef<jobject> java_bitmap =
+      gfx::ConvertToJavaBitmap(&icon_bitmap);
 
   Java_ManifestUpgradeDetectorFetcher_onDataAvailable(
       env, java_ref_, java_url, java_scope, java_name, java_short_name,
-      java_icon_url, icon_murmur2_hash, java_bitmap, info.display,
+      java_icon_url, java_icon_murmur2_hash, java_bitmap, info.display,
       info.orientation, info.theme_color, info.background_color);
 }