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// Copyright 2008, 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:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. 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.
// 3. 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 AUTHOR ``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 AUTHOR 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 "curlfetch.h"
#include <string>
#include <curl/curl.h>
using std::string;
// CURLOPT_WRITEFUNCTION:
// size*nmemb bytes of data are at ptr, stream is user data
// return must be size*nmemb or curl itself will fail.
static size_t FetchToString(void* ptr, size_t size, size_t nmemb, void* user) {
// static function, only user is DoCurlToString which uses CURLOPT_WRITEDATA
// to set the "user" arg which is the C++ string (buffer) to write to.
size_t nbytes = size * nmemb;
string *output_buffer = reinterpret_cast<string*>(user);
output_buffer->append(reinterpret_cast<char*>(ptr), nbytes);
return nbytes;
}
// Separate worker function to simplify bool return logic.
static bool DoCurlToString(CURL* curl, const char* url, string* data) {
#define CURLOK(f) (f == CURLE_OK)
if (CURLOK(curl_easy_setopt(curl, CURLOPT_URL, url)) &&
CURLOK(curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, FetchToString)) &&
CURLOK(curl_easy_setopt(curl, CURLOPT_WRITEDATA,
reinterpret_cast<void*>(data))) &&
CURLOK(curl_easy_perform(curl))) {
return true;
}
return false;
}
// Wrapper to manage curl handle. Very simple stateless implementation. Less
// simplistic would be to reuse the CURL* handle between invocations.
// TODO: implement in terms of CurlHttpRequest and remove FetchToString() and
// DoCurlToString() above (both static so nothing external knows they exist).
bool CurlToString(const char* url, string* data) {
CURL* curl = curl_easy_init();
bool ret = DoCurlToString(curl, url, data);
curl_easy_cleanup(curl);
return ret;
}
static bool CurlHttpRequest(
kmlconvenience::HttpMethodEnum http_method,
const std::string& uri,
const kmlconvenience::StringPairVector* request_headers,
const std::string* data,
std::string* response) {
CURL* curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, uri.c_str());
curl_easy_setopt(curl, CURLOPT_HEADER, 0);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
if (response) {
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, FetchToString);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, response);
}
if (uri.compare(0, 8, "https://") == 0) {
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
}
if (data) {
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data->data());
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, data->size());
}
struct curl_slist *curl_headers = NULL;
if (request_headers) {
for (unsigned int i = 0; i < request_headers->size(); ++i) {
curl_headers =
curl_slist_append(curl_headers,
kmlconvenience::HttpClient::FormatHeader(
(*request_headers)[i]).c_str());
}
}
if (http_method == kmlconvenience::HTTP_POST) {
curl_easy_setopt(curl, CURLOPT_POST, 1);
} else if (http_method == kmlconvenience::HTTP_GET) {
curl_easy_setopt(curl, CURLOPT_HTTPGET, 1L);
curl_headers = curl_slist_append(curl_headers,
"Content-Type: application/atom+xml");
}
if (curl_headers) {
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, curl_headers);
}
CURLcode curl_code = curl_easy_perform(curl);
curl_easy_cleanup(curl);
return curl_code == CURLE_OK;
}
CurlHttpClient::CurlHttpClient(const std::string &application_name)
: HttpClient(application_name) {
}
bool CurlHttpClient::SendRequest(
kmlconvenience::HttpMethodEnum http_method,
const std::string& request_uri,
const kmlconvenience::StringPairVector* request_headers,
const std::string* data,
std::string* response) const {
kmlconvenience::StringPairVector headers;
kmlconvenience::HttpClient::AppendHeaders(get_headers(), &headers);
if (request_headers) {
kmlconvenience::HttpClient::AppendHeaders(*request_headers, &headers);
}
return CurlHttpRequest(http_method, request_uri, &headers, data, response);
}
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