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// Copyright (c) 2011 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/prerender/prerender_util.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "googleurl/src/url_canon.h"
#include "googleurl/src/url_parse.h"
#include "googleurl/src/url_util.h"
namespace prerender {
bool MaybeGetQueryStringBasedAliasURL(
const GURL& url, GURL* alias_url) {
DCHECK(alias_url);
url_parse::Parsed parsed;
url_parse::ParseStandardURL(url.spec().c_str(), url.spec().length(),
&parsed);
url_parse::Component query = parsed.query;
url_parse::Component key, value;
while (url_parse::ExtractQueryKeyValue(url.spec().c_str(), &query, &key,
&value)) {
if (key.len != 3 || strncmp(url.spec().c_str() + key.begin, "url", key.len))
continue;
// We found a url= query string component.
if (value.len < 1)
continue;
url_canon::RawCanonOutputW<1024> decoded_url;
url_util::DecodeURLEscapeSequences(url.spec().c_str() + value.begin,
value.len, &decoded_url);
GURL new_url(string16(decoded_url.data(), decoded_url.length()));
if (!new_url.is_empty() && new_url.is_valid()) {
*alias_url = new_url;
return true;
}
return false;
}
return false;
}
uint8 GetQueryStringBasedExperiment(const GURL& url) {
url_parse::Parsed parsed;
url_parse::ParseStandardURL(url.spec().c_str(), url.spec().length(),
&parsed);
url_parse::Component query = parsed.query;
url_parse::Component key, value;
while (url_parse::ExtractQueryKeyValue(url.spec().c_str(), &query, &key,
&value)) {
if (key.len != 3 || strncmp(url.spec().c_str() + key.begin, "lpe", key.len))
continue;
// We found a lpe= query string component.
if (value.len != 1)
continue;
uint8 exp = *(url.spec().c_str() + value.begin) - '0';
if (exp < 1 || exp > 9)
continue;
return exp;
}
return kNoExperiment;
}
bool IsGoogleSearchResultURL(const GURL& url) {
if (!StartsWithASCII(url.host(), std::string("www.google."), true))
return false;
return (url.path().empty() ||
StartsWithASCII(url.path(), std::string("/search"), true) ||
(url.path() == "/") ||
StartsWithASCII(url.path(), std::string("/webhp"), true));
}
} // namespace prerender
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