【计网】从零开始学习http协议 --- 通过http实现客户端交互

std::string _path

class HttpResponse
{
private:
public:
    HttpResponse() : _blank_line(base_sep), _version(httpversion)
    {
    }
    std::string Serialize()
    {
    }

    ~HttpResponse()
    {
    }

private:
    // 基础变量
    std::string _version;                                     // HTTP版本
    int _code;                                                // 错误码
    std::string _desc;                                        // 错误信息
    std::unordered_map<std::string, std::string> _kv_headers; // 响应报头
    // 四大部分
    std::string _status_line;               // 请求行
    std::vector<std::string> _resp_headers; // 响应报头
    std::string _blank_line;                // 分割行
    std::string _resp_body_text;            // 正文
};

	void AddCode(int code, const std::string &desc)
    {
        _code = code;
        _desc = desc;
    }
    void AddHeader(const std::string &k, const std::string &v)
    {
        _kv_headers[k] = v;
    }
    void AddBody(const std::string &bodytext)
    {
        _resp_body_text = bodytext;
    }

	std::string Serialize()
    {
        // 构建状态行
        _status_line = _version + space_sep + std::to_string(_code) + space_sep + _desc + base_sep;
        // 构建响应报头
        for (auto &kv : _kv_headers)
        {
            _resp_headers.push_back(kv.first + line_sep + kv.second + base_sep);
        }
        // 进行序列化
        std::string res = _status_line;
        for (auto &line : _resp_headers)
        {
            res += line;
        }
        res += _blank_line;
        res += _resp_body_text;
        return res;
    }

    std::string GetFileContent(const std::string &path)
    {
        std::ifstream in(path, std::ios::binary);
        if (!in.is_open())
            return std::string();
        // 获取文件大小！
        in.seekg(0, in.end);
        int filesize = in.tellg();
        in.seekg(0, in.beg);
        // 开始读取！
        std::string content;
        content.resize(filesize);
        in.read((char *)content.c_str(), filesize);
        in.close();
        return content;
    }
	std::string HandlerHelperRequest(std::string &Requeststr)
    {
    	//获取http请求
        HttpRequest hreq;
        hreq.Deserialize(Requeststr);
        // hreq.Print();
        // hreq.Url();
        std::string path = hreq.Path();//得到http请求资源路径！
        // 读取正文
        std::string content = GetFileContent(path);
        LOG(DEBUG, "content.size: %d \n", content.size());
        if (content.empty())
            return std::string();
        // 进行序列化
        HttpResponse resp;
        resp.AddCode(200, "OK");
        resp.AddHeader("Content-Length", std::to_string(content.size()));

        resp.AddBody(content);
        std::string resstr = resp.Serialize();
        
        return resstr;