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

签名SDK只包含签名功能，不包含云服务的SDK功能，云服务SDK请参见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：

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。

   1 2	//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。

   1	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。