// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ios/web/web_state/ui/crw_web_request_controller.h"
#import <WebKit/WebKit.h>
#import "base/check_op.h"
#import "base/feature_list.h"
#import "base/i18n/i18n_constants.h"
#import "base/ios/block_types.h"
#import "base/metrics/histogram_macros.h"
#import "base/strings/sys_string_conversions.h"
#import "ios/web/common/features.h"
#import "ios/web/common/referrer_util.h"
#import "ios/web/navigation/crw_navigation_item_holder.h"
#import "ios/web/navigation/crw_pending_navigation_info.h"
#import "ios/web/navigation/crw_wk_navigation_handler.h"
#import "ios/web/navigation/crw_wk_navigation_states.h"
#import "ios/web/navigation/navigation_context_impl.h"
#import "ios/web/navigation/navigation_item_impl.h"
#import "ios/web/navigation/navigation_manager_impl.h"
#import "ios/web/navigation/wk_back_forward_list_item_holder.h"
#import "ios/web/navigation/wk_navigation_util.h"
#import "ios/web/public/web_client.h"
#import "ios/web/public/web_state.h"
#import "ios/web/web_state/user_interaction_state.h"
#import "ios/web/web_state/web_state_impl.h"
#import "net/base/apple/url_conversions.h"
#import "net/base/url_util.h"
using web::wk_navigation_util::ExtractTargetURL;
using web::wk_navigation_util::IsRestoreSessionUrl;
using web::wk_navigation_util::IsWKInternalUrl;
using web::wk_navigation_util::kReferrerHeaderName;
using web::wk_navigation_util::URLNeedsUserAgentType;
namespace {
// Values for the histogram that counts slow/fast back/forward navigations.
enum class BackForwardNavigationType {
// Fast back navigation through WKWebView back-forward list.
FAST_BACK = 0,
// Slow back navigation when back-forward list navigation is not possible.
SLOW_BACK = 1,
// Fast forward navigation through WKWebView back-forward list.
FAST_FORWARD = 2,
// Slow forward navigation when back-forward list navigation is not possible.
SLOW_FORWARD = 3,
BACK_FORWARD_NAVIGATION_TYPE_COUNT
};
}
@interface CRWWebRequestController ()
@property(nonatomic, readonly) web::WebStateImpl* webState;
// Returns a web view, if one is associated from delegate.
@property(nonatomic, readonly) WKWebView* webView;
// Returns The WKNavigationDelegate handler class from delegate.
@property(nonatomic, readonly) CRWWKNavigationHandler* navigationHandler;
@end
@implementation CRWWebRequestController
- (void)loadCurrentURLWithRendererInitiatedNavigation:(BOOL)rendererInitiated {
// Reset current WebUI if one exists.
[self clearWebUI];
// Abort any outstanding page load. This ensures the delegate gets informed
// about the outgoing page, and further messages from the page are suppressed.
if (self.navigationHandler.navigationState !=
web::WKNavigationState::FINISHED) {
[self.webView stopLoading];
[self.navigationHandler stopLoading];
}
web::NavigationItem* item = self.currentNavItem;
const GURL currentURL = item ? item->GetURL() : GURL();
const bool isCurrentURLAppSpecific =
web::GetWebClient()->IsAppSpecificURL(currentURL);
// If it's a chrome URL, but not a native one, create the WebUI instance.
if (isCurrentURLAppSpecific) {
if (!(item->GetTransitionType() & ui::PAGE_TRANSITION_TYPED ||
item->GetTransitionType() & ui::PAGE_TRANSITION_AUTO_BOOKMARK) &&
self.hasOpener) {
// WebUI URLs can not be opened by DOM to prevent cross-site scripting as
// they have increased power. WebUI URLs may only be opened when the user
// types in the URL or use bookmarks.
self.navigationManagerImpl->DiscardNonCommittedItems();
return;
} else {
[self createWebUIForURL:currentURL];
}
}
// Loading a new url, must check here if it's a native chrome URL and
// replace the appropriate view if so.
if ([self maybeLoadRequestForCurrentNavigationItem]) {
[_delegate ensureWebViewCreatedForWebViewHandler:self];
[self loadRequestForCurrentNavigationItem];
}
}
- (void)loadData:(NSData*)data
MIMEType:(NSString*)MIMEType
forURL:(const GURL&)URL {
[_delegate webRequestControllerStopLoading:self];
web::NavigationItemImpl* item =
self.navigationManagerImpl->GetLastCommittedItemImpl();
if (!item) {
return;
}
auto navigationContext = web::NavigationContextImpl::CreateNavigationContext(
self.webState, URL,
/*has_user_gesture=*/true, item->GetTransitionType(),
/*is_renderer_initiated=*/false);
self.navigationHandler.navigationState = web::WKNavigationState::REQUESTED;
navigationContext->SetNavigationItemUniqueID(item->GetUniqueID());
item->SetNavigationInitiationType(
web::NavigationInitiationType::BROWSER_INITIATED);
// The load data call will replace the current navigation and the webView URL
// of the navigation will be replaced by `URL`. Set the URL of the
// navigationItem to keep them synced.
// Note: it is possible that the URL in item already match `url`. But item can
// also contain a placeholder URL intended to be replaced.
item->SetURL(URL);
navigationContext->SetMimeType(MIMEType);
WKNavigation* navigation =
[self.webView loadData:data
MIMEType:MIMEType
characterEncodingName:base::SysUTF8ToNSString(base::kCodepageUTF8)
baseURL:net::NSURLWithGURL(URL)];
[self.navigationHandler.navigationStates
setContext:std::move(navigationContext)
forNavigation:navigation];
[self.navigationHandler.navigationStates
setState:web::WKNavigationState::REQUESTED
forNavigation:navigation];
}
- (void)loadHTML:(NSString*)HTML forURL:(const GURL&)URL {
// Web View should not be created for App Specific URLs.
if (!web::GetWebClient()->IsAppSpecificURL(URL)) {
[_delegate ensureWebViewCreatedForWebViewHandler:self];
DCHECK(self.webView) << "self.webView null while trying to load HTML";
}
DCHECK(HTML.length);
self.navigationHandler.navigationState = web::WKNavigationState::REQUESTED;
WKNavigation* navigation =
[self.webView loadHTMLString:HTML baseURL:net::NSURLWithGURL(URL)];
[self.navigationHandler.navigationStates
setState:web::WKNavigationState::REQUESTED
forNavigation:navigation];
std::unique_ptr<web::NavigationContextImpl> context;
const ui::PageTransition loadHTMLTransition =
ui::PageTransition::PAGE_TRANSITION_TYPED;
if (self.webState->HasWebUI()) {
// WebUI uses `loadHTML:forURL:` to feed the content to web view. This
// should not be treated as a navigation, but WKNavigationDelegate callbacks
// still expect a valid context.
context = web::NavigationContextImpl::CreateNavigationContext(
self.webState, URL, /*has_user_gesture=*/true, loadHTMLTransition,
/*is_renderer_initiated=*/false);
context->SetNavigationItemUniqueID(self.currentNavItem->GetUniqueID());
// Transfer pending item ownership to NavigationContext.
// NavigationManager owns pending item after navigation is requested and
// until navigation context is created.
context->SetItem(self.navigationManagerImpl->ReleasePendingItem());
} else {
context = [self registerLoadRequestForURL:URL
referrer:web::Referrer()
transition:loadHTMLTransition
sameDocumentNavigation:NO
hasUserGesture:YES
rendererInitiated:NO];
}
context->SetLoadingHtmlString(true);
context->SetMimeType(@"text/html");
[self.navigationHandler.navigationStates setContext:std::move(context)
forNavigation:navigation];
}
- (void)reloadWithRendererInitiatedNavigation:(BOOL)rendererInitiated {
GURL URL = self.currentNavItem->GetURL();
self.currentNavItem->SetTransitionType(
ui::PageTransition::PAGE_TRANSITION_RELOAD);
if (!web::GetWebClient()->IsAppSpecificURL(
net::GURLWithNSURL(self.webView.URL))) {
// New navigation manager can delegate directly to WKWebView to reload
// for non-app-specific URLs. The necessary navigation states will be
// updated in WKNavigationDelegate callbacks.
WKNavigation* navigation = [self.webView reload];
[self.navigationHandler.navigationStates
setState:web::WKNavigationState::REQUESTED
forNavigation:navigation];
std::unique_ptr<web::NavigationContextImpl> navigationContext = [self
registerLoadRequestForURL:URL
referrer:self.currentNavItemReferrer
transition:ui::PageTransition::PAGE_TRANSITION_RELOAD
sameDocumentNavigation:NO
hasUserGesture:YES
rendererInitiated:rendererInitiated];
[self.navigationHandler.navigationStates
setContext:std::move(navigationContext)
forNavigation:navigation];
} else {
[self loadCurrentURLWithRendererInitiatedNavigation:rendererInitiated];
}
}
- (std::unique_ptr<web::NavigationContextImpl>)
registerLoadRequestForURL:(const GURL&)URL
sameDocumentNavigation:(BOOL)sameDocumentNavigation
hasUserGesture:(BOOL)hasUserGesture
rendererInitiated:(BOOL)rendererInitiated {
// Get the navigation type from the last main frame load request, and try to
// map that to a PageTransition.
WKNavigationType navigationType =
self.navigationHandler.pendingNavigationInfo
? self.navigationHandler.pendingNavigationInfo.navigationType
: WKNavigationTypeOther;
ui::PageTransition transition =
[self.navigationHandler pageTransitionFromNavigationType:navigationType];
WKBackForwardListItem* currentItem = self.webView.backForwardList.currentItem;
if (currentItem) {
// Target redirect pages should default to a RELOAD transition, because
// transition state is not persisted on restore.
GURL targetURL;
if (navigationType == WKNavigationTypeOther &&
IsRestoreSessionUrl(net::GURLWithNSURL(currentItem.URL)) &&
ExtractTargetURL(net::GURLWithNSURL(currentItem.URL), &targetURL) &&
targetURL == URL) {
DCHECK(ui::PageTransitionIsRedirect(transition));
transition = ui::PAGE_TRANSITION_RELOAD;
} else if (navigationType == WKNavigationTypeBackForward) {
web::NavigationItem* navigationItem = [[CRWNavigationItemHolder
holderForBackForwardListItem:self.webView.backForwardList.currentItem]
navigationItem];
if (navigationItem) {
transition = ui::PageTransitionFromInt(
transition | navigationItem->GetTransitionType());
}
}
}
// The referrer is not known yet, and will be updated later.
const web::Referrer emptyReferrer;
std::unique_ptr<web::NavigationContextImpl> context =
[self registerLoadRequestForURL:URL
referrer:emptyReferrer
transition:transition
sameDocumentNavigation:sameDocumentNavigation
hasUserGesture:hasUserGesture
rendererInitiated:rendererInitiated];
context->SetWKNavigationType(navigationType);
return context;
}
- (std::unique_ptr<web::NavigationContextImpl>)
registerLoadRequestForURL:(const GURL&)requestURL
referrer:(const web::Referrer&)referrer
transition:(ui::PageTransition)transition
sameDocumentNavigation:(BOOL)sameDocumentNavigation
hasUserGesture:(BOOL)hasUserGesture
rendererInitiated:(BOOL)rendererInitiated {
// Transfer time is registered so that further transitions within the time
// envelope are not also registered as links.
[_delegate
userInteractionStateForWebViewHandler:self] -> ResetLastTransferTime();
// Add or update pending item before any WebStateObserver callbacks.
// See https://crbug.com/842151 for a scenario where this is important.
web::NavigationItem* item =
self.navigationManagerImpl->GetPendingItemInCurrentOrRestoredSession();
if (item) {
// Update the existing pending entry.
// Typically on PAGE_TRANSITION_CLIENT_REDIRECT.
// Don't update if pending URL has a different origin, because client
// redirects can not change the origin. It is possible to have more than one
// pending navigations, so the redirect does not necesserily belong to the
// pending navigation item.
// Do not do it for localhost address as this is needed to have
// pre-rendering in tests.
if (item->GetURL().DeprecatedGetOriginAsURL() ==
requestURL.DeprecatedGetOriginAsURL() &&
!net::IsLocalhost(requestURL)) {
self.navigationManagerImpl->UpdatePendingItemUrl(requestURL);
}
} else {
BOOL isPostNavigation =
[self.navigationHandler.pendingNavigationInfo.HTTPMethod
isEqualToString:@"POST"];
self.navigationManagerImpl->AddPendingItem(
requestURL, referrer, transition,
rendererInitiated ? web::NavigationInitiationType::RENDERER_INITIATED
: web::NavigationInitiationType::BROWSER_INITIATED,
isPostNavigation, /*is_error_navigation=*/false,
web::HttpsUpgradeType::kNone);
item =
self.navigationManagerImpl->GetPendingItemInCurrentOrRestoredSession();
}
bool redirect = transition & ui::PAGE_TRANSITION_IS_REDIRECT_MASK;
if (!redirect) {
// Before changing navigation state, the delegate should be informed that
// any existing request is being cancelled before completion.
[self.navigationHandler loadCancelled];
DCHECK_EQ(web::WKNavigationState::FINISHED,
self.navigationHandler.navigationState);
}
self.navigationHandler.navigationState = web::WKNavigationState::REQUESTED;
std::unique_ptr<web::NavigationContextImpl> context =
web::NavigationContextImpl::CreateNavigationContext(
self.webState, requestURL, hasUserGesture, transition,
rendererInitiated);
context->SetNavigationItemUniqueID(item->GetUniqueID());
context->SetIsPost([self.navigationHandler isCurrentNavigationItemPOST]);
context->SetIsSameDocument(sameDocumentNavigation);
// If WKWebView.loading is used for WebState::IsLoading, do not set it for
// renderer-initated navigation otherwise WebState::IsLoading will remain true
// after hash change in the web page.
if (!IsWKInternalUrl(requestURL) && !rendererInitiated) {
self.webState->SetIsLoading(true);
}
// WKWebView may have multiple pending items. Move pending item ownership from
// NavigationManager to NavigationContext. NavigationManager owns pending item
// after navigation was requested and until NavigationContext is created. No
// need to transfer the ownership for WebUI navigations, because those
// navigation do not have access to NavigationContext.
if (self.navigationManagerImpl->GetPendingItemIndex() == -1) {
context->SetItem(self.navigationManagerImpl->ReleasePendingItem());
}
return context;
}
- (void)didFinishWithURL:(const GURL&)currentURL
loadSuccess:(BOOL)loadSuccess
context:(nullable const web::NavigationContextImpl*)context {
DCHECK_EQ(web::WKNavigationState::FINISHED,
self.navigationHandler.navigationState);
// Placeholder and restore session URLs are implementation details so should
// not notify WebStateObservers. If `context` is nullptr, don't skip
// placeholder URLs because this may be the only opportunity to update
// `isLoading` for native view reload.
if (context && IsRestoreSessionUrl(context->GetUrl()))
return;
if (IsRestoreSessionUrl(net::GURLWithNSURL(self.webView.URL)))
return;
if (context && context->IsLoadingErrorPage())
return;
if (!loadSuccess) {
// WebStateObserver callbacks will be called for load failure after
// loading placeholder URL.
return;
}
self.webState->OnPageLoaded(currentURL, YES);
if (context) {
if (context->IsRendererInitiated()) {
UMA_HISTOGRAM_MEDIUM_TIMES("PLT.iOS.RendererInitiatedPageLoadTime2",
context->GetElapsedTimeSinceCreation());
} else {
UMA_HISTOGRAM_MEDIUM_TIMES("PLT.iOS.BrowserInitiatedPageLoadTime2",
context->GetElapsedTimeSinceCreation());
}
// Use the Session Restoration User Agent as it is the only way to know if
// it is automatic or not.
if (self.webState->GetUserAgentForSessionRestoration() ==
web::UserAgentType::AUTOMATIC) {
web::GetWebClient()->LogDefaultUserAgent(self.webState,
context->GetUrl());
}
}
}
#pragma mark Navigation and Session Information
// Returns the associated NavigationManagerImpl.
- (web::NavigationManagerImpl*)navigationManagerImpl {
return self.webState ? &(self.webState->GetNavigationManagerImpl()) : nil;
}
// Returns the navigation item for the current page.
- (web::NavigationItemImpl*)currentNavItem {
return self.navigationManagerImpl
? self.navigationManagerImpl->GetCurrentItemImpl()
: nullptr;
}
// Returns the current transition type.
- (ui::PageTransition)currentTransition {
if (self.currentNavItem)
return self.currentNavItem->GetTransitionType();
else
return ui::PageTransitionFromInt(0);
}
// Returns the referrer for current navigation item. May be empty.
- (web::Referrer)currentNavItemReferrer {
web::NavigationItem* currentItem = self.currentNavItem;
return currentItem ? currentItem->GetReferrer() : web::Referrer();
}
// The HTTP headers associated with the current navigation item. These are nil
// unless the request was a POST.
- (NSDictionary<NSString*, NSString*>*)currentHTTPHeaders {
web::NavigationItem* currentItem = self.currentNavItem;
return currentItem ? currentItem->GetHttpRequestHeaders() : nil;
}
#pragma mark - WebUI
- (void)createWebUIForURL:(const GURL&)URL {
// `CreateWebUI` will do nothing if `URL` is not a WebUI URL and then
// `HasWebUI` will return false.
self.webState->CreateWebUI(URL);
}
- (void)clearWebUI {
self.webState->ClearWebUI();
}
#pragma mark - Private methods
// Checks if a load request of the current navigation item should proceed. If
// this returns `YES`, caller should create a webView and call
// `loadRequestForCurrentNavigationItem`. Otherwise this will set the request
// state to finished and call `didFinishWithURL` with failure.
- (BOOL)maybeLoadRequestForCurrentNavigationItem {
web::NavigationItem* item = self.currentNavItem;
GURL targetURL = item ? item->GetVirtualURL() : GURL();
// Load the url. The UIWebView delegate callbacks take care of updating the
// session history and UI.
if (!targetURL.is_valid()) {
[self didFinishWithURL:targetURL loadSuccess:NO context:nullptr];
self.webState->SetIsLoading(false);
self.webState->OnPageLoaded(targetURL, NO);
return NO;
}
// JavaScript should never be evaluated here. User-entered JS should be
// evaluated via stringByEvaluatingUserJavaScriptFromString.
DCHECK(!targetURL.SchemeIs(url::kJavaScriptScheme));
return YES;
}
// Internal helper method for loadRequestForCurrentNavigationItem.
- (void)defaultNavigationInternal:(NSMutableURLRequest*)request
sameDocumentNavigation:(BOOL)sameDocumentNavigation {
web::NavigationItem* item = self.currentNavItem;
GURL navigationURL = item ? item->GetURL() : GURL();
GURL virtualURL = item ? item->GetVirtualURL() : GURL();
// Do not attempt to navigate to file URLs that are typed into the
// omnibox.
if (navigationURL.SchemeIsFile() &&
!web::GetWebClient()->IsAppSpecificURL(virtualURL) &&
!IsRestoreSessionUrl(navigationURL)) {
[self.delegate webRequestControllerStopLoading:self];
return;
}
// Set `item` to nullptr here to avoid any use-after-free issues, as it can
// be cleared by the call to -registerLoadRequestForURL below.
item = nullptr;
std::unique_ptr<web::NavigationContextImpl> navigationContext =
[self registerLoadRequestForURL:navigationURL
referrer:self.currentNavItemReferrer
transition:self.currentTransition
sameDocumentNavigation:sameDocumentNavigation
hasUserGesture:YES
rendererInitiated:NO];
if (self.navigationManagerImpl->IsRestoreSessionInProgress()) {
self.navigationManagerImpl->RestoreNativeSession();
return;
}
WKNavigation* navigation = nil;
if (base::FeatureList::IsEnabled(web::features::kSetRequestAttribution)) {
request.attribution = NSURLRequestAttributionUser;
}
if (navigationURL.SchemeIsFile() &&
web::GetWebClient()->IsAppSpecificURL(virtualURL)) {
// file:// URL navigations are allowed for app-specific URLs, which
// already have elevated privileges.
[request.URL startAccessingSecurityScopedResource];
navigation = [self.webView loadFileRequest:request
allowingReadAccessToURL:request.URL];
[request.URL stopAccessingSecurityScopedResource];
} else {
navigation = [self.webView loadRequest:request];
}
[self.navigationHandler.navigationStates
setState:web::WKNavigationState::REQUESTED
forNavigation:navigation];
[self.navigationHandler.navigationStates
setContext:std::move(navigationContext)
forNavigation:navigation];
}
// Internal helper function for loadRequestForCurrentNavigationItem
- (void)webViewNavigationInternal:(web::WKBackForwardListItemHolder*)holder
sameDocumentNavigation:(BOOL)sameDocumentNavigation {
// If the current navigation URL is the same as the URL of the visible
// page, that means the user requested a reload. `goToBackForwardListItem`
// will be a no-op when it is passed the current back forward list item,
// so `reload` must be explicitly called.
web::NavigationItem* item = self.currentNavItem;
GURL navigationURL = item ? item->GetURL() : GURL();
std::unique_ptr<web::NavigationContextImpl> navigationContext =
[self registerLoadRequestForURL:navigationURL
referrer:self.currentNavItemReferrer
transition:self.currentTransition
sameDocumentNavigation:sameDocumentNavigation
hasUserGesture:YES
rendererInitiated:NO];
WKNavigation* navigation = nil;
if (navigationURL == net::GURLWithNSURL(self.webView.URL)) {
navigation = [self.webView reload];
} else {
// `didCommitNavigation:` may not be called for fast navigation, so update
// the navigation type now as it is already known.
navigationContext->SetWKNavigationType(WKNavigationTypeBackForward);
navigationContext->SetMimeType(holder->mime_type());
holder->set_navigation_type(WKNavigationTypeBackForward);
navigation =
[self.webView goToBackForwardListItem:holder->back_forward_list_item()];
}
[self.navigationHandler.navigationStates
setState:web::WKNavigationState::REQUESTED
forNavigation:navigation];
[self.navigationHandler.navigationStates
setContext:std::move(navigationContext)
forNavigation:navigation];
}
// Loads request for the URL of the current navigation item. Subclasses may
// choose to build a new NSURLRequest and call
// `loadRequestForCurrentNavigationItem` on the underlying web view, or use
// native web view navigation where possible (for example, going back and
// forward through the history stack).
- (void)loadRequestForCurrentNavigationItem {
DCHECK(self.webView);
DCHECK(self.currentNavItem);
// If a load is kicked off on a WKWebView with a frame whose size is {0, 0} or
// that has a negative dimension for a size, rendering issues occur that
// manifest in erroneous scrolling and tap handling (crbug.com/574996,
// crbug.com/577793).
DCHECK_GT(CGRectGetWidth(self.webView.frame), 0.0);
DCHECK_GT(CGRectGetHeight(self.webView.frame), 0.0);
web::WKBackForwardListItemHolder* holder =
self.navigationHandler.currentBackForwardListItemHolder;
BOOL repostedForm =
[holder->http_method() isEqualToString:@"POST"] &&
(holder->navigation_type() == WKNavigationTypeFormResubmitted ||
holder->navigation_type() == WKNavigationTypeFormSubmitted);
web::NavigationItemImpl* currentItem = self.currentNavItem;
NSData* POSTData = currentItem->GetPostData();
NSMutableURLRequest* request = [self requestForCurrentNavigationItem];
// If the request has POST data and is not a repost form, configure the POST
// request.
if (POSTData.length && !repostedForm) {
[request setHTTPMethod:@"POST"];
[request setHTTPBody:POSTData];
[request setAllHTTPHeaderFields:self.currentHTTPHeaders];
}
BOOL sameDocumentNavigation = currentItem->IsCreatedFromHashChange();
// If there is no corresponding WKBackForwardListItem, or the item is not
// in the current WKWebView's back-forward list, navigating using WKWebView
// API is not possible. In this case, fall back to the default navigation
// mechanism.
if (!holder->back_forward_list_item() ||
![self isBackForwardListItemValid:holder->back_forward_list_item()]) {
[self defaultNavigationInternal:request
sameDocumentNavigation:sameDocumentNavigation];
return;
}
[self webViewNavigationInternal:holder
sameDocumentNavigation:sameDocumentNavigation];
}
// Returns a NSMutableURLRequest that represents the current NavigationItem.
- (NSMutableURLRequest*)requestForCurrentNavigationItem {
web::NavigationItem* item = self.currentNavItem;
const GURL currentNavigationURL = item ? item->GetURL() : GURL();
NSMutableURLRequest* request = [NSMutableURLRequest
requestWithURL:net::NSURLWithGURL(currentNavigationURL)];
const web::Referrer referrer(self.currentNavItemReferrer);
if (referrer.url.is_valid()) {
std::string referrerValue =
web::ReferrerHeaderValueForNavigation(currentNavigationURL, referrer);
if (!referrerValue.empty()) {
[request setValue:base::SysUTF8ToNSString(referrerValue)
forHTTPHeaderField:kReferrerHeaderName];
}
}
// If there are headers in the current session entry add them to `request`.
// Headers that would overwrite fields already present in `request` are
// skipped.
NSDictionary<NSString*, NSString*>* headers = self.currentHTTPHeaders;
for (NSString* headerName in headers) {
if (![request valueForHTTPHeaderField:headerName]) {
[request setValue:[headers objectForKey:headerName]
forHTTPHeaderField:headerName];
}
}
return request;
}
// Returns YES if the given WKBackForwardListItem is valid to use for
// navigation.
- (BOOL)isBackForwardListItemValid:(WKBackForwardListItem*)item {
// The current back-forward list item MUST be in the WKWebView's back-forward
// list to be valid.
WKBackForwardList* list = self.webView.backForwardList;
return list.currentItem == item ||
[list.forwardList indexOfObject:item] != NSNotFound ||
[list.backList indexOfObject:item] != NSNotFound;
}
#pragma mark - Private properties
- (web::WebStateImpl*)webState {
return [_delegate webStateImplForWebViewHandler:self];
}
- (WKWebView*)webView {
return [_delegate webViewForWebViewHandler:self];
}
- (CRWWKNavigationHandler*)navigationHandler {
return [_delegate webRequestControllerNavigationHandler:self];
}
// Whether the associated WebState has an opener.
- (BOOL)hasOpener {
return self.webState ? self.webState->HasOpener() : NO;
}
@end
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