Add a function to escape a query part of url

net/base/url_util.cc

 // 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"
@@ skipping 116 matching lines @@
                            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;
 }
 
+GURL EscapeQueryParameters(const GURL& url) {
+  const std::string input = url.query();
+  url::Component cursor(0, input.size());
+  std::string output;
+  url::Component key_range, value_range;
+  while (url::ExtractQueryKeyValue(
+      input.data(), &cursor, &key_range, &value_range)) {
+    std::string key(input.data() + key_range.begin, key_range.len);
+    std::string value(input.data() + value_range.begin, value_range.len);
+    std::string unescaped_key = UnescapeURLComponent(
+        key,
+        net::UnescapeRule::SPACES | net::UnescapeRule::URL_SPECIAL_CHARS |
+            net::UnescapeRule::REPLACE_PLUS_WITH_SPACE);
+    std::string unescaped_value = UnescapeURLComponent(
+        value,
+        net::UnescapeRule::SPACES | net::UnescapeRule::URL_SPECIAL_CHARS |
+            net::UnescapeRule::REPLACE_PLUS_WITH_SPACE);
+    std::string param_name = EscapeQueryParamValue(unescaped_key, true);
+    std::string param_value = EscapeQueryParamValue(unescaped_value, true);
+    std::string key_value_pair = (param_name + "=" + param_value);
+    if (!output.empty())
+      output += "&";
+
+    output += key_value_pair;
+  }
+  if (output.empty())
+    return url;
+
+  GURL::Replacements replacements;
+  replacements.SetQueryStr(output);
+  return url.ReplaceComponents(replacements);
+}
+
 }  // namespace net