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//
// Copyright (C) 2019 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "host/commands/fetcher/curl_wrapper.h"
#include <stdio.h>
#include <mutex>
#include <sstream>
#include <string>
#include <android-base/logging.h>
#include <curl/curl.h>
#include <json/json.h>
namespace cuttlefish {
namespace {
size_t file_write_callback(char *ptr, size_t, size_t nmemb, void *userdata) {
std::stringstream* stream = (std::stringstream*) userdata;
stream->write(ptr, nmemb);
return nmemb;
}
curl_slist* build_slist(const std::vector<std::string>& strings) {
curl_slist* curl_headers = nullptr;
for (const auto& str : strings) {
curl_slist* temp = curl_slist_append(curl_headers, str.c_str());
if (temp == nullptr) {
LOG(ERROR) << "curl_slist_append failed to add " << str;
if (curl_headers) {
curl_slist_free_all(curl_headers);
return nullptr;
}
}
curl_headers = temp;
}
return curl_headers;
}
} // namespace
CurlWrapper::CurlWrapper() {
curl_ = curl_easy_init();
if (!curl_) {
LOG(ERROR) << "failed to initialize curl";
return;
}
}
CurlWrapper::~CurlWrapper() { curl_easy_cleanup(curl_); }
CurlResponse<std::string> CurlWrapper::DownloadToFile(const std::string& url,
const std::string& path) {
return CurlWrapper::DownloadToFile(url, path, {});
}
CurlResponse<std::string> CurlWrapper::DownloadToFile(
const std::string& url, const std::string& path,
const std::vector<std::string>& headers) {
std::lock_guard<std::mutex> lock(mutex_);
LOG(INFO) << "Attempting to save \"" << url << "\" to \"" << path << "\"";
if (!curl_) {
LOG(ERROR) << "curl_ was not initialized\n";
return {"", -1};
}
curl_slist* curl_headers = build_slist(headers);
curl_easy_reset(curl_);
curl_easy_setopt(curl_, CURLOPT_CAINFO, "/etc/ssl/certs/ca-certificates.crt");
curl_easy_setopt(curl_, CURLOPT_HTTPHEADER, curl_headers);
curl_easy_setopt(curl_, CURLOPT_URL, url.c_str());
char error_buf[CURL_ERROR_SIZE];
curl_easy_setopt(curl_, CURLOPT_ERRORBUFFER, error_buf);
curl_easy_setopt(curl_, CURLOPT_VERBOSE, 1L);
FILE* file = fopen(path.c_str(), "w");
if (!file) {
LOG(ERROR) << "could not open file " << path;
return {"", -1};
}
curl_easy_setopt(curl_, CURLOPT_WRITEDATA, (void*)file);
CURLcode res = curl_easy_perform(curl_);
if (curl_headers) {
curl_slist_free_all(curl_headers);
}
fclose(file);
if (res != CURLE_OK) {
LOG(ERROR) << "curl_easy_perform() failed. "
<< "Code was \"" << res << "\". "
<< "Strerror was \"" << curl_easy_strerror(res) << "\". "
<< "Error buffer was \"" << error_buf << "\".";
return {"", -1};
}
long http_code = 0;
curl_easy_getinfo(curl_, CURLINFO_RESPONSE_CODE, &http_code);
return {path, http_code};
}
CurlResponse<std::string> CurlWrapper::DownloadToString(
const std::string& url) {
return DownloadToString(url, {});
}
CurlResponse<std::string> CurlWrapper::DownloadToString(
const std::string& url, const std::vector<std::string>& headers) {
std::lock_guard<std::mutex> lock(mutex_);
LOG(INFO) << "Attempting to download \"" << url << "\"";
if (!curl_) {
LOG(ERROR) << "curl was not initialized\n";
return {"", -1};
}
curl_slist* curl_headers = build_slist(headers);
curl_easy_reset(curl_);
curl_easy_setopt(curl_, CURLOPT_CAINFO, "/etc/ssl/certs/ca-certificates.crt");
curl_easy_setopt(curl_, CURLOPT_HTTPHEADER, curl_headers);
curl_easy_setopt(curl_, CURLOPT_URL, url.c_str());
std::stringstream data;
curl_easy_setopt(curl_, CURLOPT_WRITEFUNCTION, file_write_callback);
curl_easy_setopt(curl_, CURLOPT_WRITEDATA, &data);
char error_buf[CURL_ERROR_SIZE];
curl_easy_setopt(curl_, CURLOPT_ERRORBUFFER, error_buf);
curl_easy_setopt(curl_, CURLOPT_VERBOSE, 1L);
CURLcode res = curl_easy_perform(curl_);
if (curl_headers) {
curl_slist_free_all(curl_headers);
}
if (res != CURLE_OK) {
LOG(ERROR) << "curl_easy_perform() failed. "
<< "Code was \"" << res << "\". "
<< "Strerror was \"" << curl_easy_strerror(res) << "\". "
<< "Error buffer was \"" << error_buf << "\".";
return {"", -1};
}
long http_code = 0;
curl_easy_getinfo(curl_, CURLINFO_RESPONSE_CODE, &http_code);
return {data.str(), http_code};
}
CurlResponse<Json::Value> CurlWrapper::DownloadToJson(const std::string& url) {
return DownloadToJson(url, {});
}
CurlResponse<Json::Value> CurlWrapper::DownloadToJson(
const std::string& url, const std::vector<std::string>& headers) {
CurlResponse<std::string> response = DownloadToString(url, headers);
const std::string& contents = response.data;
Json::CharReaderBuilder builder;
std::unique_ptr<Json::CharReader> reader(builder.newCharReader());
Json::Value json;
std::string errorMessage;
if (!reader->parse(&*contents.begin(), &*contents.end(), &json, &errorMessage)) {
LOG(ERROR) << "Could not parse json: " << errorMessage;
json["error"] = "Failed to parse json.";
json["response"] = contents;
}
return {json, response.http_code};
}
}
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