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/**
* @file restclient.cpp
* @brief implementation of the restclient class
* @author Daniel Schauenberg <d@unwiredcouch.com>
*/
/*========================
INCLUDES
========================*/
#include "restclient-cpp/restclient.h"
#include <cstring>
#include <string>
#include <iostream>
#include <map>
/** initialize user agent string */
const char* RestClient::user_agent = "restclient-cpp/" VERSION;
/** initialize authentication variable */
std::string RestClient::user_pass = std::string();
/** Authentication Methods implementation */
void RestClient::clearAuth(){
RestClient::user_pass.clear();
}
void RestClient::setAuth(const std::string& user,const std::string& password){
RestClient::user_pass.clear();
RestClient::user_pass += user+":"+password;
}
/**
* @brief HTTP GET method
*
* @param url to query
*
* @return response struct
*/
RestClient::response RestClient::get(const std::string& url)
{
/** create return struct */
RestClient::response ret = {};
// use libcurl
CURL *curl = NULL;
CURLcode res = CURLE_OK;
curl = curl_easy_init();
if (curl)
{
/** set basic authentication if present*/
if(RestClient::user_pass.length()>0){
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(curl, CURLOPT_USERPWD, RestClient::user_pass.c_str());
}
/** set user agent */
curl_easy_setopt(curl, CURLOPT_USERAGENT, RestClient::user_agent);
/** set query URL */
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
/** set callback function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, RestClient::write_callback);
/** set data object to pass to callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ret);
/** set the header callback function */
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, RestClient::header_callback);
/** callback object for headers */
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &ret);
/** perform the actual query */
res = curl_easy_perform(curl);
if (res != CURLE_OK)
{
ret.body = "Failed to query.";
ret.code = -1;
return ret;
}
long http_code = 0;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
ret.code = static_cast<int>(http_code);
curl_easy_cleanup(curl);
curl_global_cleanup();
}
return ret;
}
/**
* @brief HTTP POST method
*
* @param url to query
* @param ctype content type as string
* @param data HTTP POST body
*
* @return response struct
*/
RestClient::response RestClient::post(const std::string& url,
const std::string& ctype,
const std::string& data)
{
/** create return struct */
RestClient::response ret = {};
/** build content-type header string */
std::string ctype_header = "Content-Type: " + ctype;
// use libcurl
CURL *curl = NULL;
CURLcode res = CURLE_OK;
curl = curl_easy_init();
if (curl)
{
/** set basic authentication if present*/
if(RestClient::user_pass.length()>0){
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(curl, CURLOPT_USERPWD, RestClient::user_pass.c_str());
}
/** set user agent */
curl_easy_setopt(curl, CURLOPT_USERAGENT, RestClient::user_agent);
/** set query URL */
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
/** Now specify we want to POST data */
curl_easy_setopt(curl, CURLOPT_POST, 1L);
/** set post fields */
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data.c_str());
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, data.size());
/** set callback function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, RestClient::write_callback);
/** set data object to pass to callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ret);
/** set the header callback function */
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, RestClient::header_callback);
/** callback object for headers */
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &ret);
/** set content-type header */
curl_slist* header = NULL;
header = curl_slist_append(header, ctype_header.c_str());
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header);
/** perform the actual query */
res = curl_easy_perform(curl);
if (res != CURLE_OK)
{
ret.body = "Failed to query.";
ret.code = -1;
return ret;
}
long http_code = 0;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
ret.code = static_cast<int>(http_code);
curl_slist_free_all(header);
curl_easy_cleanup(curl);
curl_global_cleanup();
}
return ret;
}
/**
* @brief HTTP PUT method
*
* @param url to query
* @param ctype content type as string
* @param data HTTP PUT body
*
* @return response struct
*/
RestClient::response RestClient::put(const std::string& url,
const std::string& ctype,
const std::string& data)
{
/** create return struct */
RestClient::response ret = {};
/** build content-type header string */
std::string ctype_header = "Content-Type: " + ctype;
/** initialize upload object */
RestClient::upload_object up_obj;
up_obj.data = data.c_str();
up_obj.length = data.size();
// use libcurl
CURL *curl = NULL;
CURLcode res = CURLE_OK;
curl = curl_easy_init();
if (curl)
{
/** set basic authentication if present*/
if(RestClient::user_pass.length()>0){
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(curl, CURLOPT_USERPWD, RestClient::user_pass.c_str());
}
/** set user agent */
curl_easy_setopt(curl, CURLOPT_USERAGENT, RestClient::user_agent);
/** set query URL */
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
/** Now specify we want to PUT data */
curl_easy_setopt(curl, CURLOPT_PUT, 1L);
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
/** set read callback function */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, RestClient::read_callback);
/** set data object to pass to callback function */
curl_easy_setopt(curl, CURLOPT_READDATA, &up_obj);
/** set callback function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, RestClient::write_callback);
/** set data object to pass to callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ret);
/** set the header callback function */
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, RestClient::header_callback);
/** callback object for headers */
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &ret);
/** set data size */
curl_easy_setopt(curl, CURLOPT_INFILESIZE,
static_cast<long>(up_obj.length));
/** set content-type header */
curl_slist* header = NULL;
header = curl_slist_append(header, ctype_header.c_str());
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header);
/** perform the actual query */
res = curl_easy_perform(curl);
if (res != CURLE_OK)
{
ret.body = "Failed to query.";
ret.code = -1;
return ret;
}
long http_code = 0;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
ret.code = static_cast<int>(http_code);
curl_slist_free_all(header);
curl_easy_cleanup(curl);
curl_global_cleanup();
}
return ret;
}
/**
* @brief HTTP DELETE method
*
* @param url to query
*
* @return response struct
*/
RestClient::response RestClient::del(const std::string& url)
{
/** create return struct */
RestClient::response ret = {};
/** we want HTTP DELETE */
const char* http_delete = "DELETE";
// use libcurl
CURL *curl = NULL;
CURLcode res = CURLE_OK;
curl = curl_easy_init();
if (curl)
{
/** set basic authentication if present*/
if(RestClient::user_pass.length()>0){
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(curl, CURLOPT_USERPWD, RestClient::user_pass.c_str());
}
/** set user agent */
curl_easy_setopt(curl, CURLOPT_USERAGENT, RestClient::user_agent);
/** set query URL */
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
/** set HTTP DELETE METHOD */
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, http_delete);
/** set callback function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, RestClient::write_callback);
/** set data object to pass to callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ret);
/** set the header callback function */
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, RestClient::header_callback);
/** callback object for headers */
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &ret);
/** perform the actual query */
res = curl_easy_perform(curl);
if (res != CURLE_OK)
{
ret.body = "Failed to query.";
ret.code = -1;
return ret;
}
long http_code = 0;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
ret.code = static_cast<int>(http_code);
curl_easy_cleanup(curl);
curl_global_cleanup();
}
return ret;
}
/**
* @brief write callback function for libcurl
*
* @param data returned data of size (size*nmemb)
* @param size size parameter
* @param nmemb memblock parameter
* @param userdata pointer to user data to save/work with return data
*
* @return (size * nmemb)
*/
size_t RestClient::write_callback(void *data, size_t size, size_t nmemb,
void *userdata)
{
RestClient::response* r;
r = reinterpret_cast<RestClient::response*>(userdata);
r->body.append(reinterpret_cast<char*>(data), size*nmemb);
return (size * nmemb);
}
/**
* @brief header callback for libcurl
*
* @param data returned (header line)
* @param size of data
* @param nmemb memblock
* @param userdata pointer to user data object to save headr data
* @return size * nmemb;
*/
size_t RestClient::header_callback(void *data, size_t size, size_t nmemb,
void *userdata)
{
RestClient::response* r;
r = reinterpret_cast<RestClient::response*>(userdata);
std::string header(reinterpret_cast<char*>(data), size*nmemb);
size_t seperator = header.find_first_of(":");
if ( std::string::npos == seperator ) {
//roll with non seperated headers...
trim(header);
if ( 0 == header.length() ){
return (size * nmemb); //blank line;
}
r->headers[header] = "present";
} else {
std::string key = header.substr(0, seperator);
trim(key);
std::string value = header.substr(seperator + 1);
trim (value);
r->headers[key] = value;
}
return (size * nmemb);
}
/**
* @brief read callback function for libcurl
*
* @param pointer of max size (size*nmemb) to write data to
* @param size size parameter
* @param nmemb memblock parameter
* @param userdata pointer to user data to read data from
*
* @return (size * nmemb)
*/
size_t RestClient::read_callback(void *data, size_t size, size_t nmemb,
void *userdata)
{
/** get upload struct */
RestClient::upload_object* u;
u = reinterpret_cast<RestClient::upload_object*>(userdata);
/** set correct sizes */
size_t curl_size = size * nmemb;
size_t copy_size = (u->length < curl_size) ? u->length : curl_size;
/** copy data to buffer */
memcpy(data, u->data, copy_size);
/** decrement length and increment data pointer */
u->length -= copy_size;
u->data += copy_size;
/** return copied size */
return copy_size;
}