tdlight/tdnet/td/net/HttpHeaderCreator.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/logging.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
namespace td {
class HttpHeaderCreator {
public:
static constexpr size_t MAX_HEADER = 4096;
HttpHeaderCreator() : sb_(MutableSlice{header_, MAX_HEADER}) {
}
void init_ok() {
sb_ = StringBuilder(MutableSlice{header_, MAX_HEADER});
sb_ << "HTTP/1.1 200 OK\r\n";
}
void init_get(Slice url) {
sb_ = StringBuilder(MutableSlice{header_, MAX_HEADER});
sb_ << "GET " << url << " HTTP/1.1\r\n";
}
void init_post(Slice url) {
sb_ = StringBuilder(MutableSlice{header_, MAX_HEADER});
sb_ << "POST " << url << " HTTP/1.1\r\n";
}
void init_error(int code, Slice reason) {
sb_ = StringBuilder(MutableSlice{header_, MAX_HEADER});
sb_ << "HTTP/1.1 " << code << " " << reason << "\r\n";
}
void init_status_line(int http_status_code) {
sb_ = StringBuilder(MutableSlice{header_, MAX_HEADER});
sb_ << "HTTP/1.1 " << http_status_code << " " << get_status_line(http_status_code) << "\r\n";
}
void add_header(Slice key, Slice value) {
sb_ << key << ": " << value << "\r\n";
}
void set_content_type(Slice type) {
add_header("Content-Type", type);
}
void set_content_size(size_t size) {
add_header("Content-Length", PSLICE() << size);
}
void set_keep_alive() {
add_header("Connection", "keep-alive");
}
Result<Slice> finish(Slice content = {}) TD_WARN_UNUSED_RESULT {
sb_ << "\r\n";
if (!content.empty()) {
sb_ << content;
}
if (sb_.is_error()) {
return Status::Error("Too much headers");
}
return sb_.as_cslice();
}
private:
static CSlice get_status_line(int http_status_code) {
if (http_status_code == 200) {
return CSlice("OK");
}
switch (http_status_code) {
case 201:
return CSlice("Created");
case 202:
return CSlice("Accepted");
case 204:
return CSlice("No Content");
case 206:
return CSlice("Partial Content");
case 301:
return CSlice("Moved Permanently");
case 302:
return CSlice("Found");
case 303:
return CSlice("See Other");
case 304:
return CSlice("Not Modified");
case 307:
return CSlice("Temporary Redirect");
case 400:
return CSlice("Bad Request");
case 401:
return CSlice("Unauthorized");
case 403:
return CSlice("Forbidden");
case 404:
return CSlice("Not Found");
case 405:
return CSlice("Method Not Allowed");
case 406:
return CSlice("Not Acceptable");
case 408:
return CSlice("Request Timeout");
case 409:
return CSlice("Conflict");
case 411:
return CSlice("Length Required");
case 413:
return CSlice("Request Entity Too Large");
case 414:
return CSlice("Request-URI Too Long");
case 415:
return CSlice("Unsupported Media Type");
case 418:
return CSlice("I'm a teapot");
case 429:
return CSlice("Too Many Requests");
case 431:
return CSlice("Request Header Fields Too Large");
case 480:
return CSlice("Temporarily Unavailable");
case 501:
return CSlice("Not Implemented");
case 502:
return CSlice("Bad Gateway");
case 503:
return CSlice("Service Unavailable");
case 505:
return CSlice("HTTP Version Not Supported");
default:
LOG_IF(ERROR, http_status_code != 500) << "Unsupported status code " << http_status_code << " returned";
return CSlice("Internal Server Error");
}
}
char header_[MAX_HEADER];
StringBuilder sb_;
};
} // namespace td