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http_parser.cpp
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executable file
·115 lines (102 loc) · 3.54 KB
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#include "http_parser.h"
http_parser::http_parser(const std::string request)
{
assert(request.size() > 0);
this->request = request;
}
http_parser::~http_parser() { }
http_request http_parser::get_parse_result()
{
parse_line();
parse_requestline();
parse_headers();
return parse_result;
}
void http_parser::parse_line()
{
std::string::size_type line_begin = 0; // 正在解析的行的行首索引
std::string::size_type check_index = 0; // 正在解析的字符索引
while(check_index < request.size())
{
// 如果当前字符是'\r'，则有可能读到一行
if(request[check_index] == '\r')
{
// 如果当前字符是最后一个字符则说明请求没有读取完整
if((check_index + 1) == request.size())
{
std::cout << "Request not to read the complete." << std::endl;
return;
}
// 如果下一个字符是'\n'，则说明我们读取到了完整的一行
else if(request[check_index+1] == '\n')
{
lines.push_back(std::string(request, line_begin,
check_index - line_begin));
check_index += 2;
line_begin = check_index;
}
else
{
std::cout << "Request error." << std::endl;
return;
}
}
else
++check_index;
}
return;
}
void http_parser::parse_requestline()
{
std::string requestline = lines[0];
// first_ws指向请求行的第一个空白字符(' '或'\t')
auto first_ws = std::find_if(requestline.cbegin(), requestline.cend(),
[](char c)->bool { return (c == ' ' || c == '\t'); });
// 如果请求行中没有出现空白则请求必定有错误
if(first_ws == requestline.cend())
{
std::cout << "Request error." << std::endl;
return;
}
// 截取请求方法
parse_result.method = std::string(requestline.cbegin(), first_ws);
// reverse_last_ws指向请求行中的最后一个空白字符(' '或'\t')
auto reverse_last_ws = std::find_if(requestline.crbegin(), requestline.crend(),
[](char c)->bool { return (c == ' ' || c == '\t'); });
auto last_ws = reverse_last_ws.base();
parse_result.version = std::string(last_ws, requestline.cend());
while((*first_ws == ' ' || *first_ws == '\t') && first_ws != requestline.cend())
++first_ws;
--last_ws;
while((*last_ws == ' ' || *last_ws == '\t') && last_ws != requestline.cbegin())
--last_ws;
parse_result.uri = std::string(first_ws, last_ws + 1);
return;
}
void http_parser::parse_headers()
{
for(int i = 1; i < lines.size(); ++i)
{
if(lines[i].empty()) // 如果遇到空行说明请求解析完毕
return;
else if(strncasecmp(lines[i].c_str(), "Host:", 5) == 0) // 处理"Host"头部字段
{
auto iter = lines[i].cbegin() + 5;
while(*iter == ' ' || *iter == '\t')
++iter;
parse_result.host = std::string(iter, lines[i].cend());
}
else if(strncasecmp(lines[i].c_str(), "Connection:", 11) == 0) // 处理"Connection"头部字段
{
auto iter = lines[i].cbegin() + 11;
while(*iter == ' ' || *iter == '\t')
++iter;
parse_result.connection = std::string(iter, lines[i].cend());
}
else
{
// 其他头部字段暂时忽略
}
}
return;
}