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// Copyright (c) 2012 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 "content/browser/browser_url_handler_impl.h"
#include "base/strings/string_util.h"
#include "content/browser/webui/web_ui_impl.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/url_constants.h"
#include "url/gurl.h"
namespace content {
// Handles rewriting view-source URLs for what we'll actually load.
static bool HandleViewSource(GURL* url,
BrowserContext* browser_context) {
if (url->SchemeIs(kViewSourceScheme)) {
// Load the inner URL instead.
*url = GURL(url->path());
// Bug 26129: limit view-source to view the content and not any
// other kind of 'active' url scheme like 'javascript' or 'data'.
static const char* const allowed_sub_schemes[] = {
chrome::kHttpScheme, chrome::kHttpsScheme, chrome::kFtpScheme,
chrome::kChromeDevToolsScheme, chrome::kChromeUIScheme,
chrome::kFileScheme, chrome::kFileSystemScheme
};
bool is_sub_scheme_allowed = false;
for (size_t i = 0; i < arraysize(allowed_sub_schemes); i++) {
if (url->SchemeIs(allowed_sub_schemes[i])) {
is_sub_scheme_allowed = true;
break;
}
}
if (!is_sub_scheme_allowed) {
*url = GURL(kAboutBlankURL);
return false;
}
return true;
}
return false;
}
// Turns a non view-source URL into the corresponding view-source URL.
static bool ReverseViewSource(GURL* url, BrowserContext* browser_context) {
// No action necessary if the URL is already view-source:
if (url->SchemeIs(kViewSourceScheme))
return false;
url_canon::Replacements<char> repl;
repl.SetScheme(kViewSourceScheme,
url_parse::Component(0, strlen(kViewSourceScheme)));
repl.SetPath(url->spec().c_str(),
url_parse::Component(0, url->spec().size()));
*url = url->ReplaceComponents(repl);
return true;
}
static bool HandleDebugUrl(GURL* url, BrowserContext* browser_context) {
// Circumvent processing URLs that the renderer process will handle.
return *url == GURL(kChromeUICrashURL) ||
*url == GURL(kChromeUIHangURL) ||
*url == GURL(kChromeUIKillURL) ||
*url == GURL(kChromeUIShorthangURL);
}
// static
BrowserURLHandler* BrowserURLHandler::GetInstance() {
return BrowserURLHandlerImpl::GetInstance();
}
// static
BrowserURLHandler::URLHandler BrowserURLHandler::null_handler() {
// Required for VS2010: http://connect.microsoft.com/VisualStudio/feedback/details/520043/error-converting-from-null-to-a-pointer-type-in-std-pair
return NULL;
}
// static
BrowserURLHandlerImpl* BrowserURLHandlerImpl::GetInstance() {
return Singleton<BrowserURLHandlerImpl>::get();
}
BrowserURLHandlerImpl::BrowserURLHandlerImpl() {
AddHandlerPair(&HandleDebugUrl, BrowserURLHandlerImpl::null_handler());
GetContentClient()->browser()->BrowserURLHandlerCreated(this);
// view-source:
AddHandlerPair(&HandleViewSource, &ReverseViewSource);
}
BrowserURLHandlerImpl::~BrowserURLHandlerImpl() {
}
void BrowserURLHandlerImpl::AddHandlerPair(URLHandler handler,
URLHandler reverse_handler) {
url_handlers_.push_back(HandlerPair(handler, reverse_handler));
}
void BrowserURLHandlerImpl::RewriteURLIfNecessary(
GURL* url,
BrowserContext* browser_context,
bool* reverse_on_redirect) {
for (size_t i = 0; i < url_handlers_.size(); ++i) {
URLHandler handler = *url_handlers_[i].first;
if (handler && handler(url, browser_context)) {
*reverse_on_redirect = (url_handlers_[i].second != NULL);
return;
}
}
}
bool BrowserURLHandlerImpl::ReverseURLRewrite(
GURL* url, const GURL& original, BrowserContext* browser_context) {
for (size_t i = 0; i < url_handlers_.size(); ++i) {
URLHandler reverse_rewriter = *url_handlers_[i].second;
if (reverse_rewriter) {
GURL test_url(original);
URLHandler handler = *url_handlers_[i].first;
if (!handler) {
if (reverse_rewriter(url, browser_context))
return true;
} else if (handler(&test_url, browser_context)) {
return reverse_rewriter(url, browser_context);
}
}
}
return false;
}
} // namespace content
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