Cytoplasm/include/Cytoplasm/Http.h
Jordan Bancino 461357b526 Move headers from src/include to include/Cytoplasm.
This makes it easier to build Cytoplasm as a component of another
program (for example, Telodendria), or as a standalone system library.
2024-01-13 18:40:31 -05:00

211 lines
6.7 KiB
C

/*
* Copyright (C) 2022-2024 Jordan Bancino <@jordan:bancino.net>
*
* 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 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 CYTOPLASM_HTTP_H
#define CYTOPLASM_HTTP_H
/***
* @Nm Http
* @Nd Encode and decode various parts of the HTTP protocol.
* @Dd March 12 2023
* @Xr HttpClient HttpServer HashMap Queue Memory
*
* .Nm
* is a collection of utility functions and type definitions that are
* useful for dealing with HTTP. HTTP is not a complex protocol, but
* this API makes it a lot easier to work with.
* .Pp
* Note that this API doesn't target any particular HTTP version, but
* it is currently used with HTTP 1.0 clients and servers, and
* therefore may be lacking functionality added in later HTTP versions.
*/
#include <stdio.h>
#include "HashMap.h"
#include "Stream.h"
#define HTTP_FLAG_NONE 0
#define HTTP_FLAG_TLS (1 << 0)
/**
* The request methods defined by the HTTP standard. These numeric
* constants should be preferred to strings when building HTTP APIs
* because they are more efficient.
*/
typedef enum HttpRequestMethod
{
HTTP_METHOD_UNKNOWN,
HTTP_GET,
HTTP_HEAD,
HTTP_POST,
HTTP_PUT,
HTTP_DELETE,
HTTP_CONNECT,
HTTP_OPTIONS,
HTTP_TRACE,
HTTP_PATCH
} HttpRequestMethod;
/**
* An enumeration that corresponds to the actual integer values of the
* valid HTTP response codes.
*/
typedef enum HttpStatus
{
HTTP_STATUS_UNKNOWN = 0,
/* Informational responses */
HTTP_CONTINUE = 100,
HTTP_SWITCHING_PROTOCOLS = 101,
HTTP_EARLY_HINTS = 103,
/* Successful responses */
HTTP_OK = 200,
HTTP_CREATED = 201,
HTTP_ACCEPTED = 202,
HTTP_NON_AUTHORITATIVE_INFORMATION = 203,
HTTP_NO_CONTENT = 204,
HTTP_RESET_CONTENT = 205,
HTTP_PARTIAL_CONTENT = 206,
/* Redirection messages */
HTTP_MULTIPLE_CHOICES = 300,
HTTP_MOVED_PERMANENTLY = 301,
HTTP_FOUND = 302,
HTTP_SEE_OTHER = 303,
HTTP_NOT_MODIFIED = 304,
HTTP_TEMPORARY_REDIRECT = 307,
HTTP_PERMANENT_REDIRECT = 308,
/* Client error messages */
HTTP_BAD_REQUEST = 400,
HTTP_UNAUTHORIZED = 401,
HTTP_FORBIDDEN = 403,
HTTP_NOT_FOUND = 404,
HTTP_METHOD_NOT_ALLOWED = 405,
HTTP_NOT_ACCEPTABLE = 406,
HTTP_PROXY_AUTH_REQUIRED = 407,
HTTP_REQUEST_TIMEOUT = 408,
HTTP_CONFLICT = 409,
HTTP_GONE = 410,
HTTP_LENGTH_REQUIRED = 411,
HTTP_PRECONDITION_FAILED = 412,
HTTP_PAYLOAD_TOO_LARGE = 413,
HTTP_URI_TOO_LONG = 414,
HTTP_UNSUPPORTED_MEDIA_TYPE = 415,
HTTP_RANGE_NOT_SATISFIABLE = 416,
HTTP_EXPECTATION_FAILED = 417,
HTTP_TEAPOT = 418,
HTTP_UPGRADE_REQUIRED = 426,
HTTP_PRECONDITION_REQUIRED = 428,
HTTP_TOO_MANY_REQUESTS = 429,
HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
HTTP_UNAVAILABLE_FOR_LEGAL_REASONS = 451,
/* Server error responses */
HTTP_INTERNAL_SERVER_ERROR = 500,
HTTP_NOT_IMPLEMENTED = 501,
HTTP_BAD_GATEWAY = 502,
HTTP_SERVICE_UNAVAILABLE = 503,
HTTP_GATEWAY_TIMEOUT = 504,
HTTP_VERSION_NOT_SUPPORTED = 505,
HTTP_VARIANT_ALSO_NEGOTIATES = 506,
HTTP_NOT_EXTENDED = 510,
HTTP_NETWORK_AUTH_REQUIRED = 511
} HttpStatus;
/**
* Convert an HTTP status enumeration value into a string description
* of the status, which is to be used in server response to a client,
* or a client response to a user. For example, calling
* .Fn HttpStatusToString "HTTP_GATEWAY_TIMEOUT"
* (or
* .Fn HttpStatusToString "504" )
* produces the string "Gateway Timeout". Note that the returned
* pointers point to static space, so their manipulation is forbidden.
*/
extern const char * HttpStatusToString(const HttpStatus);
/**
* Convert a string into a numeric code that can be used throughout
* the code of a program in an efficient manner. See the definition
* of HttpRequestMethod. This function does case-sensitive matching,
* and does not trim or otherwise process the input string.
*/
extern HttpRequestMethod HttpRequestMethodFromString(const char *);
/**
* Convert a numeric code as defined by HttpRequestMethod into a
* string that can be sent to a server. Note that the returned pointers
* point to static space, so their manipulation is forbidden.
*/
extern const char * HttpRequestMethodToString(const HttpRequestMethod);
/**
* Encode a C string such that it can safely appear in a URL by
* performing the necessary percent escaping. A new string on the
* heap is returned. It should be freed with
* .Fn Free ,
* defined in the
* .Xr Memory 3
* API.
*/
extern char * HttpUrlEncode(char *);
/**
* Decode a percent-encoded string into a C string, ignoring encoded
* null characters entirely, because those would do nothing but cause
* problems.
*/
extern char * HttpUrlDecode(char *);
/**
* Decode an encoded parameter string in the form of
* ``key=val&key2=val2'' into a hash map whose values are C strings.
* This function properly decodes keys and values using the functions
* defined above.
*/
extern HashMap * HttpParamDecode(char *);
/**
* Encode a hash map whose values are strings as an HTTP parameter
* string suitable for GET or POST requests.
*/
extern char * HttpParamEncode(HashMap *);
/**
* Read HTTP headers from a stream and return a hash map whose values
* are strings. All keys are lowercased to make querying them
* consistent and not dependent on the case that was read from the
* stream. This is useful for both client and server code, since the
* headers are in the same format. This function should be used after
* parsing the HTTP status line, because it does not parse that line.
* It will stop when it encounters the first blank line, which
* indicates that the body is beginning. After this function completes,
* the body may be immediately read from the stream without any
* additional processing.
*/
extern HashMap * HttpParseHeaders(Stream *);
#endif