Allow the creation of partially spoofed user agents

webkit/glue/user_agent.cc

 // 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 "webkit/glue/user_agent.h"
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include <sys/utsname.h>
 #endif
 
@@ skipping 137 matching lines @@
 #elif defined(OS_MACOSX)
       "Macintosh; ";
 #elif defined(USE_X11)
       "X11; ";           // strange, but that's what Firefox uses
 #elif defined(OS_ANDROID)
       "Linux; ";
 #else
       "Unknown; ";
 #endif
 
-  std::string user_agent;
+  std::string os_info;
+  base::StringAppendF(&os_info, "%s%s", kUserAgentPlatform,
+                      webkit_glue::BuildOSCpuInfo().c_str());
+  return BuildUserAgentFromOSAndProduct(os_info, product);
+}
 
+std::string BuildUserAgentFromOSAndProduct(const std::string& os_info,
+                                           const std::string& product) {
+  // Derived from Safari's UA string.
   // This is done to expose our product name in a manner that is maximally
   // compatible with Safari, we hope!!
-
-  // Derived from Safari's UA string.
+  std::string user_agent;
   base::StringAppendF(
       &user_agent,
-      "Mozilla/5.0 (%s%s) AppleWebKit/%d.%d"
-      " (KHTML, like Gecko) %s Safari/%d.%d",
-      kUserAgentPlatform,
-      webkit_glue::BuildOSCpuInfo().c_str(),
+      "Mozilla/5.0 (%s) AppleWebKit/%d.%d (KHTML, like Gecko) %s Safari/%d.%d",
+      os_info.c_str(),
       WEBKIT_VERSION_MAJOR,
       WEBKIT_VERSION_MINOR,
       product.c_str(),
       WEBKIT_VERSION_MAJOR,
       WEBKIT_VERSION_MINOR);
   return user_agent;
 }
 
 }  // namespace webkit_glue