libcurl_wrapper.h

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// Copyright (c) 2009, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// A wrapper for libcurl to do HTTP Uploads, to support easy mocking
// and unit testing of the HTTPUpload class.

#include <string>
#include <map>

#include "common/using_std_string.h"
#include "third_party/curl/curl.h"

namespace google_breakpad {
class LibcurlWrapper {
 public:
  LibcurlWrapper();
  virtual bool Init();
  virtual bool SetProxy(const string& proxy_host,
                        const string& proxy_userpwd);
  virtual bool AddFile(const string& upload_file_path,
                       const string& basename);
  virtual bool SendRequest(const string& url,
                           const std::map<string, string>& parameters,
                           string* server_response);
 private:
  // This function initializes class state corresponding to function
  // pointers into the CURL library.
  bool SetFunctionPointers();

  bool init_ok_;                 // Whether init succeeded
  void* curl_lib_;               // Pointer to result of dlopen() on
                                 // curl library
  string last_curl_error_;  // The text of the last error when
                                 // dealing
  // with CURL.

  CURL *curl_;                   // Pointer for handle for CURL calls.

  CURL* (*easy_init_)(void);

  // Stateful pointers for calling into curl_formadd()
  struct curl_httppost *formpost_;
  struct curl_httppost *lastptr_;
  struct curl_slist *headerlist_;

  // Function pointers into CURL library
  CURLcode (*easy_setopt_)(CURL *, CURLoption, ...);
  CURLFORMcode (*formadd_)(struct curl_httppost **,
                           struct curl_httppost **, ...);
  struct curl_slist* (*slist_append_)(struct curl_slist *, const char *);
  void (*slist_free_all_)(struct curl_slist *);
  CURLcode (*easy_perform_)(CURL *);
  const char* (*easy_strerror_)(CURLcode);
  void (*easy_cleanup_)(CURL *);
  void (*formfree_)(struct curl_httppost *);

};
}