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// Copyright 2013 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 "net/base/url_util.h"
#include <utility>
#include "base/logging.h"
#include "base/strings/string_piece.h"
#include "net/base/escape.h"
#include "url/gurl.h"
namespace net {
GURL AppendQueryParameter(const GURL& url,
const std::string& name,
const std::string& value) {
std::string query(url.query());
if (!query.empty())
query += "&";
query += (EscapeQueryParamValue(name, true) + "=" +
EscapeQueryParamValue(value, true));
GURL::Replacements replacements;
replacements.SetQueryStr(query);
return url.ReplaceComponents(replacements);
}
GURL AppendOrReplaceQueryParameter(const GURL& url,
const std::string& name,
const std::string& value) {
bool replaced = false;
std::string param_name = EscapeQueryParamValue(name, true);
std::string param_value = EscapeQueryParamValue(value, true);
const std::string input = url.query();
url_parse::Component cursor(0, input.size());
std::string output;
url_parse::Component key_range, value_range;
while (url_parse::ExtractQueryKeyValue(
input.data(), &cursor, &key_range, &value_range)) {
const base::StringPiece key(
input.data() + key_range.begin, key_range.len);
const base::StringPiece value(
input.data() + value_range.begin, value_range.len);
std::string key_value_pair;
// Check |replaced| as only the first pair should be replaced.
if (!replaced && key == param_name) {
replaced = true;
key_value_pair = (param_name + "=" + param_value);
} else {
key_value_pair.assign(input.data(),
key_range.begin,
value_range.end() - key_range.begin);
}
if (!output.empty())
output += "&";
output += key_value_pair;
}
if (!replaced) {
if (!output.empty())
output += "&";
output += (param_name + "=" + param_value);
}
GURL::Replacements replacements;
replacements.SetQueryStr(output);
return url.ReplaceComponents(replacements);
}
QueryIterator::QueryIterator(const GURL& url)
: url_(url),
at_end_(!url.is_valid()) {
if (!at_end_) {
query_ = url.parsed_for_possibly_invalid_spec().query;
Advance();
}
}
QueryIterator::~QueryIterator() {
}
std::string QueryIterator::GetKey() const {
DCHECK(!at_end_);
if (key_.is_nonempty())
return url_.spec().substr(key_.begin, key_.len);
return std::string();
}
std::string QueryIterator::GetValue() const {
DCHECK(!at_end_);
if (value_.is_nonempty())
return url_.spec().substr(value_.begin, value_.len);
return std::string();
}
const std::string& QueryIterator::GetUnescapedValue() {
DCHECK(!at_end_);
if (value_.is_nonempty() && unescaped_value_.empty()) {
unescaped_value_ = UnescapeURLComponent(
GetValue(),
UnescapeRule::SPACES |
UnescapeRule::URL_SPECIAL_CHARS |
UnescapeRule::REPLACE_PLUS_WITH_SPACE);
}
return unescaped_value_;
}
bool QueryIterator::IsAtEnd() const {
return at_end_;
}
void QueryIterator::Advance() {
DCHECK (!at_end_);
key_.reset();
value_.reset();
unescaped_value_.clear();
at_end_ = !url_parse::ExtractQueryKeyValue(url_.spec().c_str(),
&query_,
&key_,
&value_);
}
bool GetValueForKeyInQuery(const GURL& url,
const std::string& search_key,
std::string* out_value) {
for (QueryIterator it(url); !it.IsAtEnd(); it.Advance()) {
if (it.GetKey() == search_key) {
*out_value = it.GetUnescapedValue();
return true;
}
}
return false;
}
} // namespace net
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