文档首页/ API签名指南/ 开发指南/ AK/SK签名认证操作指导/ 签名SDK与demo/ C++
更新时间：2024-06-26 GMT+08:00
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C++

准备环境

以Linux Ubuntu系统为例，首先需要安装SSL相关工具。

  1. 安装openssl库。 
    apt-get install libssl-dev
  2. 安装curl库。 
    apt-get install libcurl4-openssl-dev

获取SDK

点此下载SDK与Demo。

解压时选择解压到当前文件夹，解压后目录结构如下：

名称

说明

hasher.cpp

SDK代码

hasher.h

header.h

RequestParams.cpp

RequestParams.h

signer.cpp

signer.h

constants.h

Makefile

Makefile文件

main.cpp

示例代码

请求签名与API调用

  1. 在main.cpp中加入以下引用。 

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    #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include "signer.h"

  2. 生成一个新的Signer，将AK/SK分别填入。

    1. 本示例以AK和SK保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量HUAWEICLOUD_SDK_AK和HUAWEICLOUD_SDK_SK。以Linux系统为例在本地将已获取的AK/SK设置为环境变量。
      1. 打开终端，输入以下命令打开环境变量配置文件。

        vi ~/.bashrc

      2. 设置环境变量，保存文件并退出编辑器。 
        export HUAWEICLOUD_SDK_AK="已获取AK值" 
export HUAWEICLOUD_SDK_SK="已获取SK值"
      3. 输入以下命令使配置文件生效。

        source ~/.bashrc

    2. 生成一个新的Signer，填入已设置的环境变量。 
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      //Set the AK/SK to sign and authenticate the request.
// Directly writing AK/SK in code is risky. For security, encrypt your AK/SK and store them in the configuration file or environment variables.
// In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, set environment variables HUAWEICLOUD_SDK_AK and HUAWEICLOUD_SDK_SK.
Signer signer(getenv("HUAWEICLOUD_SDK_AK"), getenv("HUAWEICLOUD_SDK_SK"));

  3. 生成一个新的RequestParams，指定方法名、域名、请求uri、查询字符串和body。 

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    //Specify a request method, such as GET, PUT, POST, DELETE, HEAD, and PATCH.
//Set a request URL.
//Set parameters for the request URL.
//Add a body if you have specified the PUT or POST method. Special characters, such as the double quotation mark ("), contained in the body must be escaped.
RequestParams* request = new RequestParams("GET", "service.region.example.com", "/v1/{project_id}/vpcs",
        "limit=2", "");

  4. 添加需要签名的头域，或者其他用途的头域，如多项目场景中添加X-Project-Id，或者全局服务场景中添加X-Domain-Id。 

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    //Add header parameters, for example, X-Domain-Id for invoking a global service and X-Project-Id for invoking a project-level service.
request->addHeader("X-Project-Id", "xxx");

  5. 进行签名，执行此函数会将生成的签名头加入request变量中。 

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    signer.createSignature(request);

  6. 使用curl库访问API，查看访问结果。 

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    static size_t
WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
    size_t realsize = size * nmemb;
    struct MemoryStruct *mem = (struct MemoryStruct *)userp;

    mem->memory = (char*)realloc(mem->memory, mem->size + realsize + 1);
    if (mem->memory == NULL) {
        /* out of memory! */
        printf("not enough memory (realloc returned NULL)\n");
        return 0;
    }

    memcpy(&(mem->memory[mem->size]), contents, realsize);
    mem->size += realsize;
    mem->memory[mem->size] = 0;

    return realsize;
}

//send http request using curl library
int perform_request(RequestParams* request)
{
    CURL *curl;
    CURLcode res;
    struct MemoryStruct resp_header;
    resp_header.memory = (char*)malloc(1);
    resp_header.size = 0;
    struct MemoryStruct resp_body;
    resp_body.memory = (char*)malloc(1);
    resp_body.size = 0;

    curl_global_init(CURL_GLOBAL_ALL);
    curl = curl_easy_init();

    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, request->getMethod().c_str());
    std::string url = "http://" + request->getHost() + request->getUri() + "?" + request->getQueryParams();
    curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
    struct curl_slist *chunk = NULL;
    std::set<Header>::iterator it;
    for (auto header : *request->getHeaders()) {
        std::string headerEntry = header.getKey() + ": " + header.getValue();
        printf("%s\n", headerEntry.c_str());
        chunk = curl_slist_append(chunk, headerEntry.c_str());
    }
    printf("-------------\n");
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
    curl_easy_setopt(curl, CURLOPT_COPYPOSTFIELDS, request->getPayload().c_str());
    curl_easy_setopt(curl, CURLOPT_NOBODY, 0L);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
    curl_easy_setopt(curl, CURLOPT_HEADERDATA, (void *)&resp_header);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&resp_body);
    //curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
    res = curl_easy_perform(curl);
    if (res != CURLE_OK) {
        fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
    }
    else {
        long status;
        curl_easy_getinfo(curl, CURLINFO_HTTP_CODE, &status);
        printf("status %d\n", status);
        printf(resp_header.memory);
        printf(resp_body.memory);
    }
    free(resp_header.memory);
    free(resp_body.memory);
    curl_easy_cleanup(curl);

    curl_global_cleanup();

    return 0;
}

  7. 运行make命令编译，得到可执行文件main，执行main文件，查看结果。
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