/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef ASIO_HTTP2_H
#define ASIO_HTTP2_H
#include <cstdint>
#include <memory>
#include <string>
#include <vector>
#include <functional>
namespace nghttp2 {
namespace asio_http2 {
struct header {
std::string name;
std::string value;
};
typedef std::function<void(const uint8_t *, std::size_t)> data_cb;
typedef std::function<void(void)> void_cb;
// Callback function to generate response body. The implementation of
// this callback must fill at most |len| bytes data to |buf|. The
// return value is pair of written bytes and bool value indicating
// that this is the end of the body. If the end of the body was
// reached, return true. If there is error and application wants to
// terminate stream, return std::make_pair(-1, false). Returning
// std::make_pair(0, false) tells the library that don't call this
// callback until application calls response::resume(). This is
// useful when there is no data to send at the moment but there will
// be more to come in near future.
typedef std::function<std::pair<ssize_t, bool>(uint8_t *buf, std::size_t len)>
read_cb;
class channel_impl;
class channel {
public:
// Application must not call this directly.
channel();
// Schedules the execution of callback |cb| in the same thread where
// request callback is called. Therefore, it is same to use request
// or response object in |cb|. The callbacks are executed in the
// same order they are posted though same channel object if they are
// posted from the same thread.
void post(void_cb cb);
// Application must not call this directly.
channel_impl &impl();
private:
std::unique_ptr<channel_impl> impl_;
};
typedef std::function<void(channel &)> thread_cb;
namespace server {
class request_impl;
class response_impl;
class request {
public:
// Application must not call this directly.
request();
// Returns request headers. The pusedo headers, which start with
// colon (;), are exluced from this list.
const std::vector<header> &headers() const;
// Returns method (e.g., GET).
const std::string &method() const;
// Returns scheme (e.g., https).
const std::string &scheme() const;
// Returns authority (e.g., example.org). This could be empty
// string. In this case, check host().
const std::string &authority() const;
// Returns host (e.g., example.org). If host header field is not
// present, this value is copied from authority().
const std::string &host() const;
// Returns path (e.g., /index.html).
const std::string &path() const;
// Sets callback when chunk of request body is received.
void on_data(data_cb cb);
// Sets callback when request was completed.
void on_end(void_cb cb);
// Pushes resource denoted by |path| using |method|. The additional
// headers can be given in |headers|. request_cb will be called for
// pushed resource later on. This function returns true if it
// succeeds, or false.
bool push(std::string method, std::string path,
std::vector<header> headers = {});
// Returns true if this is pushed request.
bool pushed() const;
// Returns true if stream has been closed.
bool closed() const;
// Runs function |start| in one of background threads. Returns true
// if scheduling task was done successfully.
//
// Since |start| is called in different thread, calling any method
// of request or response object in the callback may cause undefined
// behavior. To safely use them, use channel::post(). A callback
// passed to channel::post() is executed in the same thread where
// request callback is called, so it is safe to use request or
// response object. Example::
bool run_task(thread_cb start);
// Application must not call this directly.
request_impl &impl();
private:
std::unique_ptr<request_impl> impl_;
};
class response {
public:
// Application must not call this directly.
response();
// Write response header using |status_code| (e.g., 200) and
// additional headers in |headers|.
void write_head(unsigned int status_code, std::vector<header> headers = {});
// Sends |data| as request body. No further call of end() is
// allowed.
void end(std::string data = "");
// Sets callback |cb| as a generator of the response body. No
// further call of end() is allowed.
void end(read_cb cb);
// Resumes deferred response.
void resume();
// Returns status code.
unsigned int status_code() const;
// Returns true if response has been started.
bool started() const;
// Application must not call this directly.
response_impl &impl();
private:
std::unique_ptr<response_impl> impl_;
};
// This is so called request callback. Called every time request is
// received.
typedef std::function<void(const std::shared_ptr<request> &,
const std::shared_ptr<response> &)> request_cb;
class http2_impl;
class http2 {
public:
http2();
~http2();
// Starts listening connection on given address and port. The
// incoming requests are handled by given callback |cb|.
void listen(const std::string &address, uint16_t port, request_cb cb);
// Sets number of native threads to handle incoming HTTP request.
// It defaults to 1.
void num_threads(size_t num_threads);
// Sets TLS private key file and certificate file. Both files must
// be in PEM format.
void tls(std::string private_key_file, std::string certificate_file);
// Sets number of background threads to run concurrent tasks (see
// request::run_task()). It defaults to 1. This is not the number
// of thread to handle incoming HTTP request. For this purpose, see
// num_threads().
void num_concurrent_tasks(size_t num_concurrent_tasks);
// Sets the maximum length to which the queue of pending
// connections.
void backlog(int backlog);
private:
std::unique_ptr<http2_impl> impl_;
};
} // namespace server
// Convenient function to create function to read file denoted by
// |path|. This can be passed to response::end().
read_cb file_reader(const std::string &path);
// Like file_reader(const std::string&), but it takes opened file
// descriptor. The passed descriptor will be closed when returned
// function object is destroyed.
read_cb file_reader_from_fd(int fd);
// Validates path so that it does not contain directory traversal
// vector. Returns true if path is safe. The |path| must start with
// "/" otherwise returns false. This function should be called after
// percent-decode was performed.
bool check_path(const std::string &path);
// Performs percent-decode against string |s|.
std::string percent_decode(const std::string &s);
// Returns HTTP date representation of current posix time |t|.
std::string http_date(int64_t t);
} // namespace asio_http2
} // namespace nghttp2
#endif // ASIO_HTTP2_H