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// Copyright 2015 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.
#import "ios/web/webui/crw_web_ui_manager.h"
#include "base/mac/bind_objc_block.h"
#include "base/mac/scoped_nsobject.h"
#include "base/memory/scoped_vector.h"
#import "base/strings/sys_string_conversions.h"
#include "base/values.h"
#import "ios/web/net/request_group_util.h"
#include "ios/web/public/browser_state.h"
#include "ios/web/public/web_client.h"
#import "ios/web/public/web_state/web_state_observer_bridge.h"
#include "ios/web/web_state/web_state_impl.h"
#import "ios/web/webui/crw_web_ui_page_builder.h"
#include "ios/web/webui/url_fetcher_block_adapter.h"
#import "net/base/mac/url_conversions.h"
namespace {
// Prefix for history.requestFavicon JavaScript message.
const char kScriptCommandPrefix[] = "webui";
}
@interface CRWWebUIManager () <CRWWebUIPageBuilderDelegate>
// Current web state.
@property(nonatomic, readonly) web::WebStateImpl* webState;
// Composes WebUI page for webUIURL and invokes completionHandler with the
// result.
- (void)loadWebUIPageForURL:(const GURL&)webUIURL
completionHandler:(void (^)(NSString*))completionHandler;
// Retrieves resource for URL and invokes completionHandler with the result.
- (void)fetchResourceWithURL:(const GURL&)URL
completionHandler:(void (^)(NSData*))completionHandler;
// Handles JavaScript message from the WebUI page.
- (BOOL)handleWebUIJSMessage:(const base::DictionaryValue&)message;
// Removes favicon callback from web state.
- (void)resetWebState;
// Removes fetcher from vector of active fetchers.
- (void)removeFetcher:(web::URLFetcherBlockAdapter*)fetcher;
@end
@implementation CRWWebUIManager {
// Set of live WebUI fetchers for retrieving data.
ScopedVector<web::URLFetcherBlockAdapter> _fetchers;
// Bridge to observe the web state from Objective-C.
scoped_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
// Weak WebStateImpl this CRWWebUIManager is associated with.
web::WebStateImpl* _webState;
}
- (instancetype)init {
NOTREACHED();
return self;
}
- (instancetype)initWithWebState:(web::WebStateImpl*)webState {
if (self = [super init]) {
_webState = webState;
_webStateObserverBridge.reset(
new web::WebStateObserverBridge(webState, self));
base::WeakNSObject<CRWWebUIManager> weakSelf(self);
_webState->AddScriptCommandCallback(
base::BindBlock(
^bool(const base::DictionaryValue& message, const GURL&, bool) {
return [weakSelf handleWebUIJSMessage:message];
}),
kScriptCommandPrefix);
}
return self;
}
- (void)dealloc {
[self resetWebState];
[super dealloc];
}
#pragma mark - CRWWebStateObserver Methods
- (void)webState:(web::WebState*)webState
didStartProvisionalNavigationForURL:(const GURL&)URL {
DCHECK(webState == _webState);
// If URL is not an application specific URL, ignore the navigation.
if (!web::GetWebClient()->IsAppSpecificURL(URL))
return;
GURL navigationURL(URL);
// Add request group ID to the URL, if not present. Request group ID may
// already be added if restoring state to a WebUI page.
GURL requestURL =
web::ExtractRequestGroupIDFromURL(net::NSURLWithGURL(URL))
? URL
: net::GURLWithNSURL(web::AddRequestGroupIDToURL(
net::NSURLWithGURL(URL), _webState->GetRequestGroupID()));
base::WeakNSObject<CRWWebUIManager> weakSelf(self);
[self loadWebUIPageForURL:requestURL
completionHandler:^(NSString* HTML) {
web::WebStateImpl* webState = [weakSelf webState];
if (webState) {
webState->LoadWebUIHtml(base::SysNSStringToUTF16(HTML),
navigationURL);
}
}];
}
- (void)webStateDidLoadPage:(web::WebState*)webState {
DCHECK_EQ(webState, _webState);
// All WebUI pages are HTML based.
_webState->SetContentsMimeType("text/html");
}
- (void)webStateDestroyed:(web::WebState*)webState {
[self resetWebState];
}
#pragma mark - CRWWebUIPageBuilderDelegate Methods
- (void)webUIPageBuilder:(CRWWebUIPageBuilder*)webUIPageBuilder
fetchResourceWithURL:(const GURL&)resourceURL
completionHandler:(web::WebUIDelegateCompletion)completionHandler {
GURL URL(resourceURL);
[self fetchResourceWithURL:URL
completionHandler:^(NSData* data) {
base::scoped_nsobject<NSString> resource(
[[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding]);
completionHandler(resource, URL);
}];
}
#pragma mark - Private Methods
- (void)loadWebUIPageForURL:(const GURL&)webUIURL
completionHandler:(void (^)(NSString*))handler {
base::scoped_nsobject<CRWWebUIPageBuilder> pageBuilder(
[[CRWWebUIPageBuilder alloc] initWithDelegate:self]);
[pageBuilder buildWebUIPageForURL:webUIURL completionHandler:handler];
}
- (void)fetchResourceWithURL:(const GURL&)URL
completionHandler:(void (^)(NSData*))completionHandler {
base::WeakNSObject<CRWWebUIManager> weakSelf(self);
web::URLFetcherBlockAdapterCompletion fetcherCompletion =
^(NSData* data, web::URLFetcherBlockAdapter* fetcher) {
completionHandler(data);
[weakSelf removeFetcher:fetcher];
};
_fetchers.push_back(
[self fetcherForURL:URL completionHandler:fetcherCompletion]);
_fetchers.back()->Start();
}
- (BOOL)handleWebUIJSMessage:(const base::DictionaryValue&)message {
std::string command;
if (!message.GetString("message", &command) ||
command != "webui.requestFavicon") {
DLOG(WARNING) << "Unexpected message received" << command;
return NO;
}
const base::ListValue* arguments = nullptr;
if (!message.GetList("arguments", &arguments)) {
DLOG(WARNING) << "JS message parameter not found: arguments";
return NO;
}
std::string favicon;
if (!arguments->GetString(0, &favicon)) {
DLOG(WARNING) << "JS message parameter not found: Favicon URL";
return NO;
}
GURL faviconURL(favicon);
DCHECK(faviconURL.is_valid());
// Retrieve favicon resource and set favicon background image via JavaScript.
base::WeakNSObject<CRWWebUIManager> weakSelf(self);
void (^faviconHandler)(NSData*) = ^void(NSData* data) {
NSString* base64EncodedResource = [data base64EncodedStringWithOptions:0];
NSString* dataURLString = [NSString
stringWithFormat:@"data:image/png;base64,%@", base64EncodedResource];
NSString* faviconURLString = base::SysUTF8ToNSString(faviconURL.spec());
NSString* script =
[NSString stringWithFormat:@"chrome.setFaviconBackground('%@', '%@');",
faviconURLString, dataURLString];
[weakSelf webState]->ExecuteJavaScriptAsync(
base::SysNSStringToUTF16(script));
};
[self fetchResourceWithURL:faviconURL completionHandler:faviconHandler];
return YES;
}
- (void)resetWebState {
if (_webState) {
_webState->RemoveScriptCommandCallback(kScriptCommandPrefix);
}
_webState = nullptr;
}
- (web::WebStateImpl*)webState {
return _webState;
}
- (void)removeFetcher:(web::URLFetcherBlockAdapter*)fetcher {
_fetchers.erase(std::find(_fetchers.begin(), _fetchers.end(), fetcher));
}
#pragma mark - Testing-Only Methods
- (scoped_ptr<web::URLFetcherBlockAdapter>)
fetcherForURL:(const GURL&)URL
completionHandler:(web::URLFetcherBlockAdapterCompletion)handler {
return scoped_ptr<web::URLFetcherBlockAdapter>(
new web::URLFetcherBlockAdapter(
URL, _webState->GetBrowserState()->GetRequestContext(), handler));
}
@end
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