mirror of
https://github.com/matrix-construct/construct
synced 2024-12-25 15:04:10 +01:00
804 lines
23 KiB
C++
804 lines
23 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include <ircd/spirit.h>
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namespace ircd::http
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{
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using namespace ircd::spirit;
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template<class it, class top = unused_type> struct grammar;
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struct parser extern const parser;
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extern const std::unordered_map<ircd::http::code, ircd::string_view> reason;
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[[noreturn]] void throw_error(const qi::expectation_failure<const char *> &, const bool &internal = false);
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}
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BOOST_FUSION_ADAPT_STRUCT
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(
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ircd::http::query,
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( decltype(ircd::http::query::first), first )
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( decltype(ircd::http::query::second), second )
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)
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BOOST_FUSION_ADAPT_STRUCT
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(
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ircd::http::header,
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( decltype(ircd::http::header::first), first )
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( decltype(ircd::http::header::second), second )
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)
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BOOST_FUSION_ADAPT_STRUCT
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(
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ircd::http::line::response,
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( decltype(ircd::http::line::response::version), version )
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( decltype(ircd::http::line::response::status), status )
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( decltype(ircd::http::line::response::reason), reason )
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)
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BOOST_FUSION_ADAPT_STRUCT
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(
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ircd::http::line::request,
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( decltype(ircd::http::line::request::method), method )
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( decltype(ircd::http::line::request::path), path )
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( decltype(ircd::http::line::request::query), query )
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( decltype(ircd::http::line::request::fragment), fragment )
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( decltype(ircd::http::line::request::version), version )
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)
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decltype(ircd::http::reason)
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ircd::http::reason
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{
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{ code::CONTINUE, "Continue" },
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{ code::SWITCHING_PROTOCOLS, "Switching Protocols" },
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{ code::OK, "OK" },
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{ code::CREATED, "Created" },
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{ code::ACCEPTED, "Accepted" },
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{ code::NON_AUTHORITATIVE_INFORMATION, "Non-Authoritative Information" },
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{ code::NO_CONTENT, "No Content" },
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{ code::PARTIAL_CONTENT, "Partial Content" },
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{ code::MULTIPLE_CHOICES, "Multiple Choices" },
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{ code::MOVED_PERMANENTLY, "Moved Permanently" },
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{ code::FOUND, "Found" },
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{ code::SEE_OTHER, "See Other" },
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{ code::NOT_MODIFIED, "Not Modified" },
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{ code::TEMPORARY_REDIRECT, "Temporary Redirect" },
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{ code::PERMANENT_REDIRECT, "Permanent Redirect" },
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{ code::BAD_REQUEST, "Bad Request" },
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{ code::UNAUTHORIZED, "Unauthorized" },
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{ code::FORBIDDEN, "Forbidden" },
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{ code::NOT_FOUND, "Not Found" },
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{ code::METHOD_NOT_ALLOWED, "Method Not Allowed" },
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{ code::REQUEST_TIMEOUT, "Request Time-out" },
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{ code::CONFLICT, "Conflict" },
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{ code::LENGTH_REQUIRED, "Length Required" },
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{ code::PAYLOAD_TOO_LARGE, "Payload Too Large" },
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{ code::REQUEST_URI_TOO_LONG, "Request URI Too Long" },
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{ code::EXPECTATION_FAILED, "Expectation Failed" },
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{ code::IM_A_TEAPOT, "Negative, I Am A Meat Popsicle" },
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{ code::UNPROCESSABLE_ENTITY, "Unprocessable Entity" },
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{ code::TOO_MANY_REQUESTS, "Too Many Requests" },
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{ code::REQUEST_HEADER_FIELDS_TOO_LARGE, "Request Header Fields Too Large" },
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{ code::INTERNAL_SERVER_ERROR, "Internal Server Error" },
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{ code::NOT_IMPLEMENTED, "Not Implemented" },
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{ code::BAD_GATEWAY, "Bad Gateway" },
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{ code::SERVICE_UNAVAILABLE, "Service Unavailable" },
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{ code::HTTP_VERSION_NOT_SUPPORTED, "HTTP Version Not Supported" },
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{ code::INSUFFICIENT_STORAGE, "Insufficient Storage" },
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};
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template<class it,
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class top>
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struct ircd::http::grammar
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:qi::grammar<it, top>
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{
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template<class R = unused_type, class... S> using rule = qi::rule<it, R, S...>;
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rule<> NUL { lit('\0') ,"nul" };
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// insignificant whitespaces
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rule<> SP { lit('\x20') ,"space" };
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rule<> HT { lit('\x09') ,"horizontal tab" };
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rule<> ws { SP | HT ,"whitespace" };
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rule<> CR { lit('\x0D') ,"carriage return" };
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rule<> LF { lit('\x0A') ,"line feed" };
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rule<> CRLF { CR >> LF ,"carriage return, line feed" };
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rule<> illegal { NUL | CR | LF ,"illegal" };
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rule<> colon { lit(':') ,"colon" };
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rule<> slash { lit('/') ,"forward solidus" };
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rule<> question { lit('?') ,"question mark" };
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rule<> pound { lit('#') ,"pound sign" };
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rule<> equal { lit('=') ,"equal sign" };
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rule<> ampersand { lit('&') ,"ampersand" };
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rule<string_view> token { raw[+(char_ - (illegal | ws))] ,"token" };
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rule<string_view> string { raw[+(char_ - illegal)] ,"string" };
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rule<string_view> line { *ws >> -string >> CRLF ,"line" };
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rule<string_view> status { raw[repeat(3)[char_("0-9")]] ,"status" };
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rule<short> status_code { short_ ,"status code" };
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rule<string_view> reason { string ,"status" };
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rule<string_view> head_key { raw[+(char_ - (illegal | ws | colon))] ,"head key" };
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rule<string_view> head_val { string ,"head value" };
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rule<http::header> header { head_key >> *ws >> colon >> *ws >> head_val ,"header" };
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rule<unused_type> headers { (header % (*ws >> CRLF)) ,"headers" };
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rule<> query_terminator { equal | question | ampersand | pound ,"query terminator" };
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rule<> query_illegal { illegal | ws | query_terminator ,"query illegal" };
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rule<string_view> query_key { raw[+(char_ - query_illegal)] ,"query key" };
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rule<string_view> query_val { raw[*(char_ - query_illegal)] ,"query value" };
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rule<string_view> method { token ,"method" };
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rule<string_view> path { raw[-slash >> *(char_ - query_illegal)] ,"path" };
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rule<string_view> fragment { pound >> -token ,"fragment" };
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rule<string_view> version { token ,"version" };
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rule<size_t> chunk_size
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{
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qi::uint_parser<size_t, 16, 1, 8>{}
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,"chunk size"
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};
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rule<string_view> chunk_extensions
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{
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';' >> raw[string] //TODO: extensions
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,"chunk extensions"
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};
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rule<http::query> query
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{
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query_key >> -(equal >> query_val)
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,"query"
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};
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rule<string_view> query_string
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{
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question >> -raw[(query_key >> -(equal >> query_val)) % ampersand]
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,"query string"
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};
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rule<line::request> request_line
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{
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method >> +SP >> path >> -query_string >> -fragment >> +SP >> version
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,"request line"
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};
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rule<line::response> response_line
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{
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version >> +SP >> status >> -(+SP >> reason)
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,"response line"
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};
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rule<unused_type> request
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{
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request_line >> *ws >> CRLF >> -headers >> CRLF
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,"request"
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};
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rule<unused_type> response
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{
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response_line >> *ws >> CRLF >> -headers >> CRLF
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,"response"
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};
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grammar(const rule<top> &top_rule)
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:grammar<it, top>::base_type
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{
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top_rule
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}
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{}
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};
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struct ircd::http::parser
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:grammar<const char *, unused_type>
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{
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static size_t content_length(const string_view &val);
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using http::grammar<const char *, unused_type>::grammar;
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parser(): grammar { grammar::ws } {}
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}
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const ircd::http::parser;
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/// Compose a request. This prints an HTTP head into the buffer. No real IO is
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/// done here. After composing into the buffer, the user can then drive the
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/// socket by sending the header and the content as specified.
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///
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/// If termination is false, no extra CRLF is printed to the buffer allowing
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/// additional headers not specified to be appended later.
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ircd::http::request::request(window_buffer &out,
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const string_view &host,
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const string_view &method,
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const string_view &uri,
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const size_t &content_length,
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const string_view &content_type,
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const vector_view<const header> &headers,
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const bool &termination)
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{
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writeline(out, [&method, &uri](const mutable_buffer &out) -> size_t
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{
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assert(!method.empty());
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assert(!uri.empty());
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return fmt::sprintf
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{
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out, "%s %s HTTP/1.1", method, uri
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};
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});
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writeline(out, [&host](const mutable_buffer &out) -> size_t
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{
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assert(!host.empty());
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return fmt::sprintf
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{
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out, "Host: %s", host
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};
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});
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if(content_length)
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writeline(out, [&content_type](const mutable_buffer &out) -> size_t
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{
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return fmt::sprintf
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{
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out, "Content-Type: %s", content_type?: "text/plain; charset=utf-8"
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};
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});
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writeline(out, [&content_length](const mutable_buffer &out) -> size_t
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{
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return fmt::sprintf
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{
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out, "Content-Length: %zu", content_length
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};
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});
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write(out, headers);
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if(termination)
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writeline(out);
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}
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ircd::http::request::head::head(parse::capstan &pc,
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const headers::closure &c)
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:line::request{pc}
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,uri
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{
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fragment? string_view { begin(path), end(fragment) }:
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query? string_view { begin(path), end(query) }:
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string_view { begin(path), end(path) }
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}
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,headers
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{
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http::headers{pc, [this, &c](const auto &h)
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{
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if(iequals(h.first, "host"_sv))
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this->host = h.second;
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else if(iequals(h.first, "expect"_sv))
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this->expect = h.second;
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else if(iequals(h.first, "te"_sv))
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this->te = h.second;
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else if(iequals(h.first, "content-length"_sv))
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this->content_length = parser.content_length(h.second);
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else if(iequals(h.first, "authorization"_sv))
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this->authorization = h.second;
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else if(iequals(h.first, "connection"_sv))
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this->connection = h.second;
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else if(iequals(h.first, "content-type"_sv))
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this->content_type = h.second;
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else if(iequals(h.first, "user-agent"_sv))
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this->user_agent = h.second;
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if(c)
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c(h);
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}}
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}
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{
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}
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ircd::http::response::response(window_buffer &out,
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const code &code,
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const size_t &content_length,
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const string_view &content_type,
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const string_view &headers_string,
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const vector_view<const header> &headers_vector,
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const bool &termination)
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{
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writeline(out, [&code](const mutable_buffer &out) -> size_t
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{
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return fmt::sprintf
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{
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out, "HTTP/1.1 %u %s", uint(code), status(code)
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};
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});
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if(code >= 200 && code < 300)
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writeline(out, [&code](const mutable_buffer &out) -> size_t
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{
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size_t ret{0};
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ret += copy(out, "Server: "_sv);
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ret += copy(out + ret, ircd::info::server_agent);
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return ret;
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});
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if(code < 400)
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writeline(out, [](const mutable_buffer &out) -> size_t
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{
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char date_buf[96];
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return fmt::sprintf
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{
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out, "Date: %s", timef(date_buf, ircd::localtime)
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};
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});
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if(code != NO_CONTENT && content_type && content_length)
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writeline(out, [&content_type](const mutable_buffer &out) -> size_t
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{
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return fmt::sprintf
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{
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out, "Content-Type: %s", content_type?: "text/plain; charset=utf-8"
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};
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});
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if(code != NO_CONTENT && content_length != size_t(-1))
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writeline(out, [&content_length](const mutable_buffer &out) -> size_t
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{
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return fmt::sprintf
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{
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out, "Content-Length: %zu", content_length
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};
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});
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if(content_length == size_t(-1))
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writeline(out, [&content_length](const mutable_buffer &out) -> size_t
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{
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return copy(out, "Transfer-Encoding: chunked"_sv);
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});
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if(!headers_string.empty())
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out([&headers_string](const mutable_buffer &out)
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{
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return copy(out, headers_string);
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});
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if(!headers_vector.empty())
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write(out, headers_vector);
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if(termination)
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writeline(out);
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}
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ircd::http::response::head::head(parse::capstan &pc,
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const headers::closure &c)
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:line::response{pc}
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,headers
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{
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http::headers{pc, [this, &c](const auto &h)
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{
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if(iequals(h.first, "content-length"s))
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this->content_length = parser.content_length(h.second);
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else if(iequals(h.first, "content-type"s))
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this->content_type = h.second;
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else if(iequals(h.first, "transfer-encoding"s))
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this->transfer_encoding = h.second;
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else if(iequals(h.first, "server"s))
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this->server = h.second;
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if(c)
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c(h);
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}}
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}
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{
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}
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ircd::http::response::chunk::chunk(parse::capstan &pc)
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try
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:line{pc}
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{
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static const parser::rule<size_t> grammar
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{
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parser.chunk_size >> -parser.chunk_extensions
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,"chunk head"
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};
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const char *start(line::begin());
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const auto res(qi::parse(start, line::end(), eps > grammar, this->size));
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assert(res == true);
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}
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catch(const qi::expectation_failure<const char *> &e)
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{
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throw_error(e, true);
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}
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ircd::http::headers::headers(parse::capstan &pc,
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const closure &c)
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:string_view{[&pc, &c]
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() -> string_view
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{
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header h{pc};
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const char *const &started{h.first.data()}, *stopped{started};
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for(; !h.first.empty(); stopped = h.second.data() + h.second.size(), h = header{pc})
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if(c)
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c(h);
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return { started, stopped };
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}()}
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{
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}
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ircd::http::header::header(const line &line)
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try
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{
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static const auto grammar
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{
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eps > parser.header
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};
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if(line.empty())
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return;
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const char *start(line.data());
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const char *const stop(line.data() + line.size());
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qi::parse(start, stop, grammar, *this);
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}
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catch(const qi::expectation_failure<const char *> &e)
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{
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throw_error(e);
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}
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ircd::http::line::response::response(const line &line)
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{
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static const auto grammar
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{
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eps > parser.response_line
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};
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const char *start(line.data());
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const char *const stop(line.data() + line.size());
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qi::parse(start, stop, grammar, *this);
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}
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ircd::http::line::request::request(const line &line)
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try
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{
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static const auto grammar
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{
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eps > parser.request_line
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};
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const char *start(line.data());
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const char *const stop(line.data() + line.size());
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qi::parse(start, stop, grammar, *this);
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}
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catch(const qi::expectation_failure<const char *> &e)
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{
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throw_error(e);
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}
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ircd::http::line::line(parse::capstan &pc)
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:string_view{[&pc]
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{
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static const auto grammar
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{
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parser.line
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};
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string_view ret;
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pc([&ret](const char *&start, const char *const &stop)
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{
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if(!qi::parse(start, stop, grammar, ret))
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{
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ret = {};
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return false;
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}
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else return true;
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});
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return ret;
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}()}
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{
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}
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ircd::string_view
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ircd::http::query::string::at(const string_view &key)
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const
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{
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const auto ret(operator[](key));
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if(ret.empty())
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throw std::out_of_range{"Failed to find value for required query string key"};
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|
|
return ret;
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::http::query::string::operator[](const string_view &key)
|
|
const
|
|
{
|
|
string_view ret;
|
|
const auto match([&key, &ret](const query &query) -> bool
|
|
{
|
|
if(query.first == key)
|
|
{
|
|
ret = query.second;
|
|
return false; // false to break out of until()
|
|
}
|
|
else return true;
|
|
});
|
|
|
|
until(match);
|
|
return ret;
|
|
}
|
|
|
|
bool
|
|
ircd::http::query::string::until(const std::function<bool (const query &)> &closure)
|
|
const
|
|
{
|
|
const auto action([&closure](const auto &attribute, const auto &context, auto &halt)
|
|
{
|
|
halt = closure(attribute);
|
|
});
|
|
|
|
const parser::rule<unused_type> grammar
|
|
{
|
|
-parser.question >> (parser.query[action] % parser.ampersand)
|
|
};
|
|
|
|
const string_view &s(*this);
|
|
const char *start(s.data()), *const stop(s.data() + s.size());
|
|
return qi::parse(start, stop, grammar);
|
|
}
|
|
|
|
void
|
|
ircd::http::query::string::for_each(const std::function<void (const query &)> &closure)
|
|
const
|
|
{
|
|
const auto action([&closure](const auto &attribute, const auto &context, auto &halt)
|
|
{
|
|
closure(attribute);
|
|
});
|
|
|
|
const parser::rule<unused_type> grammar
|
|
{
|
|
-parser.question >> (parser.query[action] % parser.ampersand)
|
|
};
|
|
|
|
const string_view &s(*this);
|
|
const char *start(s.data()), *const stop(s.data() + s.size());
|
|
qi::parse(start, stop, grammar);
|
|
}
|
|
|
|
size_t
|
|
ircd::http::parser::content_length(const string_view &str)
|
|
{
|
|
static const parser::rule<long> grammar
|
|
{
|
|
long_
|
|
};
|
|
|
|
long ret;
|
|
const char *start(str.data());
|
|
const bool parsed(qi::parse(start, start + str.size(), grammar, ret));
|
|
if(!parsed || ret < 0)
|
|
throw error
|
|
{
|
|
BAD_REQUEST, "Invalid content-length value"
|
|
};
|
|
|
|
return ret;
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::http::writechunk(const mutable_buffer &buf,
|
|
const uint32_t &chunk_size)
|
|
{
|
|
window_buffer wb{buf};
|
|
writechunk(wb, chunk_size);
|
|
return wb.completed();
|
|
}
|
|
|
|
void
|
|
ircd::http::writechunk(window_buffer &buf,
|
|
const uint32_t &chunk_size)
|
|
{
|
|
writeline(buf, [&chunk_size](const mutable_buffer &out) -> size_t
|
|
{
|
|
return ::snprintf(data(out), size(out), "%08x", chunk_size);
|
|
});
|
|
}
|
|
|
|
std::string
|
|
ircd::http::strung(const vector_view<const header> &headers)
|
|
{
|
|
return ircd::string(serialized(headers), [&]
|
|
(window_buffer out)
|
|
{
|
|
write(out, headers);
|
|
return out.consumed();
|
|
});
|
|
}
|
|
|
|
/// Indicates the buffer size required to write these headers. This size
|
|
/// may include room for a terminating null character which may be written
|
|
/// by write(headers). Only use write(headers) to know the actually written
|
|
/// string size (without null) not this.
|
|
size_t
|
|
ircd::http::serialized(const vector_view<const header> &headers)
|
|
{
|
|
// Because the write(header) functions use fmt::sprintf we have to
|
|
// indicate an extra space for a null string terminator to not overlof
|
|
const size_t initial{!headers.empty()};
|
|
return std::accumulate(std::begin(headers), std::end(headers), initial, []
|
|
(auto &ret, const auto &pair)
|
|
{
|
|
// key : SP value CRLF
|
|
return ret += pair.first.size() + 1 + 1 + pair.second.size() + 2;
|
|
});
|
|
}
|
|
|
|
void
|
|
ircd::http::write(window_buffer &out,
|
|
const vector_view<const header> &headers)
|
|
{
|
|
for(const auto &header : headers)
|
|
write(out, header);
|
|
}
|
|
|
|
void
|
|
ircd::http::write(window_buffer &out,
|
|
const header &header)
|
|
{
|
|
if(header.second.empty())
|
|
return;
|
|
|
|
assert(!header.first.empty());
|
|
if(unlikely(header.first.empty()))
|
|
return;
|
|
|
|
writeline(out, [&header](const mutable_buffer &out) -> size_t
|
|
{
|
|
return fmt::sprintf
|
|
{
|
|
out, "%s: %s", header.first, header.second
|
|
};
|
|
});
|
|
}
|
|
|
|
/// Close over the user's closure to append a newline.
|
|
void
|
|
ircd::http::writeline(window_buffer &write,
|
|
const window_buffer::closure &closure)
|
|
{
|
|
// A new window_buffer is implicit constructed out of the mutable_buffer
|
|
// otherwise presented to this closure as its write window.
|
|
write([&closure](window_buffer write)
|
|
{
|
|
const auto newline{[](const mutable_buffer &out)
|
|
{
|
|
return copy(out, "\r\n"_sv);
|
|
}};
|
|
|
|
write(closure);
|
|
write(newline);
|
|
return write.consumed();
|
|
});
|
|
}
|
|
|
|
void
|
|
ircd::http::writeline(window_buffer &write)
|
|
{
|
|
writeline(write, [](const mutable_buffer &out)
|
|
{
|
|
return 0;
|
|
});
|
|
}
|
|
|
|
/// Called to translate a grammar exception into an http::error within our
|
|
/// system. This will then usually propagate back to our client.
|
|
///
|
|
/// If we are a client to another server, set internal=true. Even though this
|
|
/// still generates an HTTP error, the code is 500 so if it propagates back to
|
|
/// a client it does not indicate to *that* client that *they* made a bad
|
|
/// request from a 400 back to them.
|
|
void
|
|
ircd::http::throw_error(const qi::expectation_failure<const char *> &e,
|
|
const bool &internal)
|
|
{
|
|
const auto &code_
|
|
{
|
|
internal?
|
|
code::INTERNAL_SERVER_ERROR:
|
|
code::BAD_REQUEST
|
|
};
|
|
|
|
const char *const &fmtstr
|
|
{
|
|
internal?
|
|
"I expected a valid HTTP %s. Server sent %zu invalid characters starting with `%s'.":
|
|
"I require a valid HTTP %s. You sent %zu invalid characters starting with `%s'."
|
|
};
|
|
|
|
const auto &rule
|
|
{
|
|
ircd::string(e.what_)
|
|
};
|
|
|
|
throw error
|
|
{
|
|
code_, fmt::snstringf
|
|
{
|
|
512, fmtstr,
|
|
between(rule, "<", ">"),
|
|
size_t(e.last - e.first),
|
|
string_view{e.first, e.last}
|
|
}
|
|
};
|
|
}
|
|
|
|
ircd::http::error::error(const http::code &code,
|
|
std::string content,
|
|
const vector_view<const header> &headers)
|
|
:http::error
|
|
{
|
|
code, std::move(content), strung(headers)
|
|
}
|
|
{
|
|
}
|
|
|
|
ircd::http::error::error(const http::code &code,
|
|
std::string content,
|
|
std::string headers)
|
|
:ircd::error{generate_skip}
|
|
,content{std::move(content)}
|
|
,headers{std::move(headers)}
|
|
,code{code}
|
|
{
|
|
snprintf(buf, sizeof(buf), "%u %s", uint(code), status(code).c_str());
|
|
}
|
|
|
|
ircd::http::code
|
|
ircd::http::status(const string_view &str)
|
|
{
|
|
static const auto grammar
|
|
{
|
|
parser.status_code
|
|
};
|
|
|
|
short ret;
|
|
const char *start(str.data());
|
|
const bool parsed(qi::parse(start, start + str.size(), grammar, ret));
|
|
if(!parsed || ret < 0 || ret >= 1000)
|
|
throw ircd::error{"Invalid HTTP status code"};
|
|
|
|
return http::code(ret);
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::http::status(const http::code &code)
|
|
try
|
|
{
|
|
return reason.at(code);
|
|
}
|
|
catch(const std::out_of_range &e)
|
|
{
|
|
log::warning
|
|
{
|
|
"No reason string for HTTP status code %u", uint(code)
|
|
};
|
|
|
|
return ""_sv;
|
|
}
|