// Copyright (c) 2006, 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.

#include "common/linux/http_upload.h"

#include <assert.h>
#include <curl/curl.h>
#include <curl/easy.h>

namespace {

// Callback to get the response data from server.
static size_t WriteCallback(void* ptr, size_t size,
                            size_t nmemb, void* userp) {
  if (!userp)
    return 0;

  string* response = reinterpret_cast<string*>(userp);
  size_t real_size = size * nmemb;
  response->append(reinterpret_cast<char*>(ptr), real_size);
  return real_size;
}

}  // namespace

namespace google_breakpad {

static const char kUserAgent[] = "Breakpad/1.0 (Linux)";

// static
bool HTTPUpload::SendRequest(const string& url,
                             const map<string, string>& parameters,
                             const map<string, string>& files,
                             const string& proxy,
                             const string& proxy_user_pwd,
                             const string& ca_certificate_file,
                             string* response_body,
                             long* response_code,
                             string* error_description) {
  if (response_code != NULL)
    *response_code = 0;

  if (!CheckParameters(parameters))
    return false;

  CURL *curl = curl_easy_init();
  if (error_description != NULL)
    *error_description = "No Error";

  CURLcode err_code = CURLE_OK;
  curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
  curl_easy_setopt(curl, CURLOPT_USERAGENT, kUserAgent);
  // Support multithread by disabling timeout handling, would get SIGSEGV with
  // Curl_resolv_timeout in stack trace otherwise.
  // See https://curl.haxx.se/libcurl/c/threadsafe.html
  curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
  // Set proxy information if necessary.
  if (!proxy.empty())
	  curl_easy_setopt(curl, CURLOPT_PROXY, proxy.c_str());
  if (!proxy_user_pwd.empty())
	  curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, proxy_user_pwd.c_str());

  if (!ca_certificate_file.empty())
	  curl_easy_setopt(curl, CURLOPT_CAINFO, ca_certificate_file.c_str());

  struct curl_httppost* formpost = NULL;
  struct curl_httppost* lastptr = NULL;
  // Add form data.
  map<string, string>::const_iterator iter = parameters.begin();
  for (; iter != parameters.end(); ++iter)
    curl_formadd(&formpost, &lastptr,
	             CURLFORM_COPYNAME, iter->first.c_str(),
	             CURLFORM_COPYCONTENTS, iter->second.c_str(),
	             CURLFORM_END);

  // Add form files.
  for (iter = files.begin(); iter != files.end(); ++iter) {
    curl_formadd(&formpost, &lastptr,
                 CURLFORM_COPYNAME, iter->first.c_str(),
                 CURLFORM_FILE, iter->second.c_str(),
                 CURLFORM_END);
  }

  curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

  // Disable 100-continue header.
  struct curl_slist* headerlist = NULL;
  char buf[] = "Expect:";
  headerlist = curl_slist_append(headerlist, buf);
  curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);

  if (response_body != NULL) {
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA,
                     reinterpret_cast<void*>(response_body));
  }

  // Fail if 400+ is returned from the web server.
  curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);

  err_code = curl_easy_perform(curl);
  if (response_code != NULL) {
    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, response_code);
  }
#ifndef NDEBUG
  if (err_code != CURLE_OK)
    fprintf(stderr, "Failed to send http request to %s, error: %s\n",
            url.c_str(),
            curl_easy_strerror(err_code));
#endif
  if (error_description != NULL)
    *error_description = curl_easy_strerror(err_code);

  curl_easy_cleanup(curl);
  if (formpost != NULL) {
    curl_formfree(formpost);
  }
  if (headerlist != NULL) {
    curl_slist_free_all(headerlist);
  }
  return err_code == CURLE_OK;
}

// static
bool HTTPUpload::CheckParameters(const map<string, string>& parameters) {
  for (map<string, string>::const_iterator pos = parameters.begin();
       pos != parameters.end(); ++pos) {
    const string& str = pos->first;
    if (str.size() == 0)
      return false;  // disallow empty parameter names
    for (unsigned int i = 0; i < str.size(); ++i) {
      int c = str[i];
      if (c < 32 || c == '"' || c > 127) {
        return false;
      }
    }
  }
  return true;
}

}  // namespace google_breakpad
