// Copyright (C) 2017-2019 Baidu, 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 Baidu, 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.

#ifndef WEBSERVICE_H
#define WEBSERVICE_H

#include <string>
#include <stdio.h>
#include <limits.h>
#include <unistd.h>
#include <stdio.h>
#include <curl/curl.h>
#include <jsoncpp/json/json.h>
#include <iostream>

#include "LogBase.h"
#include "UtilityFunctions.h"

using namespace std;
using namespace util;

enum IAS {
    sigrl,
    report
};

struct attestation_verification_report_t {
    string report_id;
    string isv_enclave_quote_status;
    string timestamp;
};

struct attestation_evidence_payload_t {
    string isv_enclave_quote;
};

struct ias_response_header_t {
    int response_status;
    int content_length;
    std::string request_id;
};

struct ias_response_container_t {
    char *p_response;
    size_t size;
};

static int REQUEST_ID_MAX_LEN = 32;
static vector<pair<string, string>> retrieved_sigrl;

class WebService {

public:
    static WebService* getInstance();
    virtual ~WebService();
    void init();
    bool getSigRL(string gid, string *sigrl);
    bool verifyQuote(uint8_t *quote, uint8_t *pseManifest, uint8_t *nonce, vector<pair<string, string>> *result);

private:
    WebService();
    bool sendToIAS(string url, IAS type, string payload,
                   struct curl_slist *headers,
                   ias_response_container_t *ias_response_container,
                   ias_response_header_t *response_header);

    string createJSONforIAS(uint8_t *quote, uint8_t *pseManifest, uint8_t *nonce);
    vector<pair<string, string>> parseJSONfromIAS(string json);

private:
    static WebService* instance;
    CURL *curl;
};

#endif