//
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// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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// Copyright 2020 Dirac Research <robert.bielik@dirac.com>
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//
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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#ifndef NNG_SUPPLEMENTAL_HTTP_HTTP_H
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#define NNG_SUPPLEMENTAL_HTTP_HTTP_H
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// HTTP API. Only present if HTTP support compiled into the library.
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// Functions will return NNG_ENOTSUP (or NULL or 0 as appropriate)
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// if the library lacks support for HTTP.
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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struct nng_tls_config;
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// HTTP status codes. This list is not exhaustive.
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enum nng_http_status {
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NNG_HTTP_STATUS_CONTINUE = 100,
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NNG_HTTP_STATUS_SWITCHING = 101,
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NNG_HTTP_STATUS_PROCESSING = 102,
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NNG_HTTP_STATUS_OK = 200,
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NNG_HTTP_STATUS_CREATED = 201,
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NNG_HTTP_STATUS_ACCEPTED = 202,
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NNG_HTTP_STATUS_NOT_AUTHORITATIVE = 203,
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NNG_HTTP_STATUS_NO_CONTENT = 204,
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NNG_HTTP_STATUS_RESET_CONTENT = 205,
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NNG_HTTP_STATUS_PARTIAL_CONTENT = 206,
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NNG_HTTP_STATUS_MULTI_STATUS = 207,
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NNG_HTTP_STATUS_ALREADY_REPORTED = 208,
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NNG_HTTP_STATUS_IM_USED = 226,
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NNG_HTTP_STATUS_MULTIPLE_CHOICES = 300,
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NNG_HTTP_STATUS_STATUS_MOVED_PERMANENTLY = 301,
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NNG_HTTP_STATUS_FOUND = 302,
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NNG_HTTP_STATUS_SEE_OTHER = 303,
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NNG_HTTP_STATUS_NOT_MODIFIED = 304,
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NNG_HTTP_STATUS_USE_PROXY = 305,
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NNG_HTTP_STATUS_TEMPORARY_REDIRECT = 307,
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NNG_HTTP_STATUS_PERMANENT_REDIRECT = 308,
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NNG_HTTP_STATUS_BAD_REQUEST = 400,
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NNG_HTTP_STATUS_UNAUTHORIZED = 401,
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NNG_HTTP_STATUS_PAYMENT_REQUIRED = 402,
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NNG_HTTP_STATUS_FORBIDDEN = 403,
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NNG_HTTP_STATUS_NOT_FOUND = 404,
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NNG_HTTP_STATUS_METHOD_NOT_ALLOWED = 405,
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NNG_HTTP_STATUS_NOT_ACCEPTABLE = 406,
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NNG_HTTP_STATUS_PROXY_AUTH_REQUIRED = 407,
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NNG_HTTP_STATUS_REQUEST_TIMEOUT = 408,
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NNG_HTTP_STATUS_CONFLICT = 409,
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NNG_HTTP_STATUS_GONE = 410,
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NNG_HTTP_STATUS_LENGTH_REQUIRED = 411,
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NNG_HTTP_STATUS_PRECONDITION_FAILED = 412,
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NNG_HTTP_STATUS_PAYLOAD_TOO_LARGE = 413,
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NNG_HTTP_STATUS_ENTITY_TOO_LONG = 414,
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NNG_HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE = 415,
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NNG_HTTP_STATUS_RANGE_NOT_SATISFIABLE = 416,
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NNG_HTTP_STATUS_EXPECTATION_FAILED = 417,
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NNG_HTTP_STATUS_TEAPOT = 418,
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NNG_HTTP_STATUS_UNPROCESSABLE_ENTITY = 422,
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NNG_HTTP_STATUS_LOCKED = 423,
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NNG_HTTP_STATUS_FAILED_DEPENDENCY = 424,
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NNG_HTTP_STATUS_UPGRADE_REQUIRED = 426,
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NNG_HTTP_STATUS_PRECONDITION_REQUIRED = 428,
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NNG_HTTP_STATUS_TOO_MANY_REQUESTS = 429,
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NNG_HTTP_STATUS_HEADERS_TOO_LARGE = 431,
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NNG_HTTP_STATUS_UNAVAIL_LEGAL_REASONS = 451,
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NNG_HTTP_STATUS_INTERNAL_SERVER_ERROR = 500,
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NNG_HTTP_STATUS_NOT_IMPLEMENTED = 501,
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NNG_HTTP_STATUS_BAD_GATEWAY = 502,
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NNG_HTTP_STATUS_SERVICE_UNAVAILABLE = 503,
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NNG_HTTP_STATUS_GATEWAY_TIMEOUT = 504,
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NNG_HTTP_STATUS_HTTP_VERSION_NOT_SUPP = 505,
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NNG_HTTP_STATUS_VARIANT_ALSO_NEGOTIATES = 506,
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NNG_HTTP_STATUS_INSUFFICIENT_STORAGE = 507,
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NNG_HTTP_STATUS_LOOP_DETECTED = 508,
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NNG_HTTP_STATUS_NOT_EXTENDED = 510,
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NNG_HTTP_STATUS_NETWORK_AUTH_REQUIRED = 511,
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};
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// nng_http_req represents an HTTP request.
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typedef struct nng_http_req nng_http_req;
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// nng_http_req_alloc creates a vanilla HTTP request object. The object is
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// initialized with the given URL object for an HTTP/1.1 GET request by
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// default. It also adds the Host: header required for HTTP/1.1. If the
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// url is NULL, then the uri and Host: header are uninitialized, and will
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// need to be set explicitly.
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NNG_DECL int nng_http_req_alloc(nng_http_req **, const nng_url *);
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// nng_http_req_free frees an HTTP request object.
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NNG_DECL void nng_http_req_free(nng_http_req *);
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// nng_http_req_get_method returns the method.
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NNG_DECL const char *nng_http_req_get_method(nng_http_req *);
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// nng_http_req_get_version returns the version, usually HTTP/1.1.
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NNG_DECL const char *nng_http_req_get_version(nng_http_req *);
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// nng_http_req_get_uri returns the "abs-uri", which is URL without
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// the scheme, host, or port.
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NNG_DECL const char *nng_http_req_get_uri(nng_http_req *);
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// nng_http_req_set_header sets an HTTP header, replacing any previous value
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// that might have been present.
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NNG_DECL int nng_http_req_set_header(
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nng_http_req *, const char *, const char *);
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// nng_http_req_add_header adds an HTTP header, without disrupting any other
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// with the same name that might have been present.
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NNG_DECL int nng_http_req_add_header(
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nng_http_req *, const char *, const char *);
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// nng_http_req_del_header deletes all occurrences of a named header.
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NNG_DECL int nng_http_req_del_header(nng_http_req *, const char *);
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// nng_http_req_get_header looks up a header with the named, returns NULL
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// if not found.
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NNG_DECL const char *nng_http_req_get_header(nng_http_req *, const char *);
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// nng_http_req_set_method is used to change the method of a request.
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// The method should be an upper case HTTP method, like POST, or DELETE.
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// Null sets the default ("GET").
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NNG_DECL int nng_http_req_set_method(nng_http_req *, const char *);
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// nng_http_req_set_version is used to change the version of a request.
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// Normally the version is "HTTP/1.1". Note that the framework does
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// not support HTTP/2 at all. Null sets the default ("HTTP/1.1").
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NNG_DECL int nng_http_req_set_version(nng_http_req *, const char *);
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// nng_http_req_set_uri is used to change the URI of a request. This
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// should be an "abs-uri", that is a path, plus query and fragment if
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// needed. The scheme, host, and port don't belong here. The URI should
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// start with a leading '/' per HTTP.
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NNG_DECL int nng_http_req_set_uri(nng_http_req *, const char *);
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// nng_http_req_set_data adds entity data to the request. The
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// data object must persist (so only really useful for static data).
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// The content-length header is updated as well, but the caller should
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// probably set the content-type header.
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NNG_DECL int nng_http_req_set_data(nng_http_req *, const void *, size_t);
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// nng_http_req_copy_data adds entity data to the response. A private
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// copy of the data is made (will be freed with the request).
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// The content-length header is updated as well, but the caller should
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// probably set the content-type header.
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NNG_DECL int nng_http_req_copy_data(nng_http_req *, const void *, size_t);
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// nng_http_req_get_data gets the data for the response.
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NNG_DECL void nng_http_req_get_data(nng_http_req *, void **, size_t *);
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// nng_http_res represents an HTTP response.
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typedef struct nng_http_res nng_http_res;
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// nng_http_res_alloc creates a vanilla HTTP response object. The object is
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// initialized for an HTTP/1.1 200 OK response by default.
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NNG_DECL int nng_http_res_alloc(nng_http_res **);
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// nng_http_res_alloc_error creates an error HTTP response object. The object
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// is initialized for an HTTP/1.1 response, and contains an associated
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// generic HTML error page.
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NNG_DECL int nng_http_res_alloc_error(nng_http_res **, uint16_t);
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// nng_http_res_free frees an HTTP response object.
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NNG_DECL void nng_http_res_free(nng_http_res *);
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// nng_http_res_get_status returns the HTTP status code from the server.
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NNG_DECL uint16_t nng_http_res_get_status(nng_http_res *);
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// nng_http_res_set_status sets the HTTP status code.
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NNG_DECL int nng_http_res_set_status(nng_http_res *, uint16_t);
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// nng_http_res_get_reason returns the human readable status message
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// that the server responds (or responded) with.
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NNG_DECL const char *nng_http_res_get_reason(nng_http_res *);
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// nng_http_res_set_reason sets the human readable status message.
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// NULL means that a default reason is used based on the status code.
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NNG_DECL int nng_http_res_set_reason(nng_http_res *, const char *);
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// nng_http_res_set_header sets an HTTP header, replacing any previous value
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// that might have been present.
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NNG_DECL int nng_http_res_set_header(
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nng_http_res *, const char *, const char *);
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// nng_http_res_add_header adds an HTTP header, without disrupting any other
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// with the same name that might have been present.
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NNG_DECL int nng_http_res_add_header(
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nng_http_res *, const char *, const char *);
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// nng_http_res_del_header deletes all occurrences of a named header.
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NNG_DECL int nng_http_res_del_header(nng_http_res *, const char *);
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// nng_http_res_get_header looks up a header with the named, returns NULL
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// if not found.
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NNG_DECL const char *nng_http_res_get_header(nng_http_res *, const char *);
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// nng_http_res_set_version is used to change the version of a response.
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// Normally the version is "HTTP/1.1". Note that the framework does
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// not support HTTP/2 at all. NULL sets the default ("HTTP/1.1").
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NNG_DECL int nng_http_res_set_version(nng_http_res *, const char *);
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// nng_http_res_get_version returns the version, usually HTTP/1.1.
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NNG_DECL const char *nng_http_res_get_version(nng_http_res *);
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// nng_http_res_get_data gets the data for the response.
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NNG_DECL void nng_http_res_get_data(nng_http_res *, void **, size_t *);
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// nng_http_res_set_data adds entity data to the response. The
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// data object must persist (so only really useful for static data).
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// The content-length header is updated as well, but the caller should
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// probably set the content-type header.
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NNG_DECL int nng_http_res_set_data(nng_http_res *, const void *, size_t);
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// nng_http_res_copy_data adds entity data to the response. A private
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// copy of the data is made (will be freed with the request).
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// The content-length header is updated as well, but the caller should
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// probably set the content-type header.
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NNG_DECL int nng_http_res_copy_data(nng_http_res *, const void *, size_t);
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// An nng_http_conn represents an underlying "connection". It may be
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// a TCP channel, or a TLS channel, but the main thing is that this is
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// normally only used for exchanging HTTP requests and responses.
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typedef struct nng_http_conn nng_http_conn;
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// nng_http_conn_close closes the underlying channel. Applications should
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// not use this channel after this operation is performed.
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NNG_DECL void nng_http_conn_close(nng_http_conn *);
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// nng_http_conn_read attempts to read data from the connection. This
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// completes as soon as at least one byte is read; it does not wait
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// for the entire aio to be filled.
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NNG_DECL void nng_http_conn_read(nng_http_conn *, nng_aio *);
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// nng_http_conn_read_all is like nng_http_conn_read, but it does not
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// finish until either all the requested data is read, or an error occurs.
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NNG_DECL void nng_http_conn_read_all(nng_http_conn *, nng_aio *);
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// nng_http_conn_write attempts to write data, but it can write less
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// than the amount requested. (It completes as soon as at least one
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// byte is written.)
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NNG_DECL void nng_http_conn_write(nng_http_conn *, nng_aio *);
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// nng_http_conn_write_all is like nng_http_conn_write, but it does not
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// finish until either all the requested data is written, or an error occurs.
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NNG_DECL void nng_http_conn_write_all(nng_http_conn *, nng_aio *);
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// nng_http_conn_write_req writes the entire request. It will also write any
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// data that has been attached.
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NNG_DECL void nng_http_conn_write_req(
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nng_http_conn *, nng_http_req *, nng_aio *);
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// nng_http_conn_write_res writes the entire response. It will also write any
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// data that has been attached.
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NNG_DECL void nng_http_conn_write_res(
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nng_http_conn *, nng_http_res *, nng_aio *);
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// nng_http_conn_read_req reads an entire request, EXCEPT for any entity
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// data. The caller is responsible for processing the headers in the request
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// and reading any submitted entity data itself.
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NNG_DECL void nng_http_conn_read_req(
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nng_http_conn *, nng_http_req *, nng_aio *);
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// nng_http_conn_read_res reads an entire response, EXCEPT for any entity
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// data. The caller is responsible for processing the headers in the response
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// and reading any submitted entity data itself.
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NNG_DECL void nng_http_conn_read_res(
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nng_http_conn *, nng_http_res *, nng_aio *);
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// nng_http_req_reset resets the request to an initially allocated state.
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NNG_DECL void nng_http_req_reset(nng_http_req *);
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// nng_http_res_reset resets the response to an initially allocated state.
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NNG_DECL void nng_http_res_reset(nng_http_res *);
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// nng_http_handler is a handler used on the server side to handle HTTP
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// requests coming into a specific URL.
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typedef struct nng_http_handler nng_http_handler;
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// nng_http_handler_alloc creates a server handler object, for the supplied
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// absolute URI (path only) with the callback. By default the handler
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// is assumed to handle only GET requests (and implictly HEAD requests
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// as well.)
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//
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// Note that methods which modify a handler cannot be called while the handler
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// is registered with the server, and that a handler can only be registered
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// once per server.
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//
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// The callback function will receive the following arguments (via
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// nng_aio_get_input(): nng_http_request *, nng_http_handler *, and
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// nng_http_conn *. The first is a request object, for convenience.
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// The second is the handler, from which the callback can obtain any other
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// data it has set. The final is the http connection, which can be used
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// to hijack the session.
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//
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// Upon completion, the handler should store an nng_http_res * as the
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// first output using nng_aio_set_output. If it does not do so, or supplies
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// NULL, then it must send a response itself.
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//
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// The callback should complete with a result of 0 in most circumstances.
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// If it completes with an error, then the connection is terminated, after
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// possibly sending a 500 error response to the client.
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NNG_DECL int nng_http_handler_alloc(
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nng_http_handler **, const char *, void (*)(nng_aio *));
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// nng_http_handler_free frees the handler. This actually just drops a
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// reference count on the handler, as it may be in use by an existing
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// server. The server will also call this when it is destroyed.
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NNG_DECL void nng_http_handler_free(nng_http_handler *);
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// nng_http_handler_alloc_file creates a "file" based handler, that
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// serves up static content from the given file path. The content-type
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// supplied is determined from the file name using a simple built-in map.
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NNG_DECL int nng_http_handler_alloc_file(
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nng_http_handler **, const char *, const char *);
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// nng_http_handler_alloc_static creates a static-content handler.
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// The last argument is the content-type, which may be NULL (in which case
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// "application/octet-stream" is assumed.)
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NNG_DECL int nng_http_handler_alloc_static(
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nng_http_handler **, const char *, const void *, size_t, const char *);
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// nng_http_handler_alloc_redirect creates an HTTP redirect handler.
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// The status is given, along with the new URL. If the status is 0,
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// then 301 will be used instead.
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NNG_DECL int nng_http_handler_alloc_redirect(
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nng_http_handler **, const char *, uint16_t, const char *);
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// nng_http_handler_alloc_file creates a "directory" based handler, that
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// serves up static content from the given directory tree. Directories
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// that contain an index.html or index.htm file use that file for the
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// directory content, otherwise a suitable error page is returned (the server
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// does not generate index pages automatically.) The content-type for
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// files is determined from the file name using a simple built-in map.
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NNG_DECL int nng_http_handler_alloc_directory(
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nng_http_handler **, const char *, const char *);
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// nng_http_handler_set_method sets the method that the handler will be
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// called for. By default this is GET. If NULL is supplied for the
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// method, then the handler is executed regardless of method, and must
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// inspect the method itself.
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NNG_DECL int nng_http_handler_set_method(nng_http_handler *, const char *);
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// nng_http_handler_set_host sets the Host: that the handler will be
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// called for (to allow for virtual hosts). If the value is NULL (the
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// default, then the Host: header is not considered when matching the
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// handler.) Note that the Host: header must match *exactly* (except
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// that case is not considered.)
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NNG_DECL int nng_http_handler_set_host(nng_http_handler *, const char *);
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// nng_http_handler_collect_body is used to indicate the server should
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// check for, and process, data sent by the client, which will be attached
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// to the request. If this is false, then the handler will need to check
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// for and process any content data. By default the server will accept
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// up to 1MB. If the client attempts to send more data than requested,
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// then a 400 Bad Request will be sent back to the client. To set an
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// unlimited value, use (size_t)-1. To preclude the client from sending
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// *any* data, use 0. (The static and file handlers use 0 by default.)
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NNG_DECL int nng_http_handler_collect_body(nng_http_handler *, bool, size_t);
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// nng_http_handler_set_tree indicates that the handler is being registered
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// for a hierarchical tree, rather than just a single path, so it will be
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// called for all child paths supplied. By default the handler is only
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// called for an exact path match.
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NNG_DECL int nng_http_handler_set_tree(nng_http_handler *);
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// nng_http_handler_set_tree_exclusive indicates that the handler is being
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// registered for a heirarchical tree *exclusively*, rather than just a single
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// path, so it will be called for all child paths supplied. By default the
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// handler is only called for an exact path match. Exclusive means that any
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// other handler on a conflicting path will induce an address conflict error
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// when added to a server.
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NNG_DECL int nng_http_handler_set_tree_exclusive(nng_http_handler *);
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// nng_http_handler_set_data is used to store additional data, along with
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// a possible clean up routine. (The clean up is a custom de-allocator and
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// will be called with the supplied data as an argument, when the handler
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// is being de-allocated.)
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NNG_DECL int nng_http_handler_set_data(
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nng_http_handler *, void *, void (*)(void *));
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// nng_http_handler_get_data returns the data that was previously stored.
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NNG_DECL void *nng_http_handler_get_data(nng_http_handler *);
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// nng_http_server is a handle to an HTTP server instance. Servers
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// only serve a single port / address at this time.
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typedef struct nng_http_server nng_http_server;
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// nng_http_server_hold gets a server structure, using the address determined
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// from the URL. If a server already exists, then a hold is placed on it, and
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// that instance is returned. If no such server exists, then a new instance
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// is created.
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NNG_DECL int nng_http_server_hold(nng_http_server **, const nng_url *);
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// nng_http_server_release releases the hold on the server. If this is the
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// last instance of the server, then it is shutdown and resources are freed.
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NNG_DECL void nng_http_server_release(nng_http_server *);
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// nng_http_server_start starts the server handling HTTP. Once this is
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// called, it will not be possible to change certain parameters (such as
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// any TLS configuration).
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NNG_DECL int nng_http_server_start(nng_http_server *);
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// nng_http_server_stop stops the server. No new client connections are
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// accepted after this returns. Once a server is stopped fully, the
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// instance will no longer be returned by nng_http_server_hold, as the
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// server may not be reused.
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NNG_DECL void nng_http_server_stop(nng_http_server *);
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// nng_http_server_add_handler registers a handler on the server.
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// This function will return NNG_EADDRINUSE if a conflicting handler
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// is already registered (i.e. a handler with the same value for Host,
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// Method, and URL.)
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NNG_DECL int nng_http_server_add_handler(
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nng_http_server *, nng_http_handler *);
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// nni_http_del_handler removes the given handler. The caller is
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// responsible for finalizing it afterwards. If the handler was not found
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// (not registered), NNG_ENOENT is returned. In this case it is unsafe
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// to make assumptions about the validity of the handler.
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NNG_DECL int nng_http_server_del_handler(
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nng_http_server *, nng_http_handler *);
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// nng_http_server_set_tls adds a TLS configuration to the server,
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// and enables the use of it. This returns NNG_EBUSY if the server is
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// already started. This wipes out the entire TLS configuration on the
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// server client, so the caller must have configured it reasonably.
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// This API is not recommended unless the caller needs complete control
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// over the TLS configuration.
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NNG_DECL int nng_http_server_set_tls(
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nng_http_server *, struct nng_tls_config *);
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// nng_http_server_get_tls obtains the TLS configuration if one is present,
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// or returns NNG_EINVAL. The TLS configuration is invalidated if the
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// nng_http_server_set_tls function is called, so be careful.
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NNG_DECL int nng_http_server_get_tls(
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nng_http_server *, struct nng_tls_config **);
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// nng_http_server_get_addr obtains the address with which the server was
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// initialized or returns NNG_EINVAL. Useful for instance when the port has
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// been automatically assigned.
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NNG_DECL int nng_http_server_get_addr(nng_http_server *, nng_sockaddr *);
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// nng_http_server_set_error_page sets a custom error page (HTML) content
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// to be sent for the given error code. This is used when the error is
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// generated internally by the framework, or when the application returns
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// the response back to the server via the handler's aio, and the response
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// was allocated with nng_http_res_alloc_error. If the response was not
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// allocated this way, or the application writes the response itself instead
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// of letting the server do so, then this setting will be ignored.
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NNG_DECL int nng_http_server_set_error_page(
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nng_http_server *, uint16_t, const char *);
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// nng_http_server_set_error_file works like nng_http_server_error_page,
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// except that the content is loaded from the named file path. The contents
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// are loaded at the time this function is called, so this function should be
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// called anytime the contents of the named file have changed.
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NNG_DECL int nng_http_server_set_error_file(
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nng_http_server *, uint16_t, const char *);
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// nng_http_server_res_error takes replaces the body of the response with
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// a custom error page previously set for the server, using the status
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// of the response. The response must have the status set first using
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// nng_http_res_set_status or implicitly via nng_http_res_alloc_error.
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NNG_DECL int nng_http_server_res_error(nng_http_server *, nng_http_res *);
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// nng_http_hijack is intended to be called by a handler that wishes to
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// take over the processing of the HTTP session -- usually to change protocols
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// (such as in the case of websocket). The caller is responsible for the
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// final disposal of the associated nng_http_conn. Also, this completely
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// disassociates the http session from the server, so the server may be
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// stopped or destroyed without affecting the hijacked session. Note also
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// that the hijacker will need to issue any HTTP reply itself. Finally,
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// when a session is hijacked, the caller is also responsible for disposing
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// of the request structure. (Some hijackers may keep the request for
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// further processing.)
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NNG_DECL int nng_http_hijack(nng_http_conn *);
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// nng_http_client represents a "client" object. Clients can be used
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// to create HTTP connections. At present, connections are not cached
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// or reused, but that could change in the future.
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typedef struct nng_http_client nng_http_client;
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// nng_http_client_alloc allocates a client object, associated with
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// the given URL.
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NNG_DECL int nng_http_client_alloc(nng_http_client **, const nng_url *);
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// nng_http_client_free frees the client. Connections created by the
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// the client are not necessarily closed.
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NNG_DECL void nng_http_client_free(nng_http_client *);
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// nng_http_client_set_tls sets the TLS configuration. This wipes out
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// the entire TLS configuration on the client, so the caller must have
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// configured it reasonably. This API is not recommended unless the
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// caller needs complete control over the TLS configuration.
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NNG_DECL int nng_http_client_set_tls(
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nng_http_client *, struct nng_tls_config *);
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// nng_http_client_get_tls obtains the TLS configuration if one is present,
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// or returns NNG_EINVAL. The supplied TLS configuration object may
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// be invalidated by any future calls to nni_http_client_set_tls.
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NNG_DECL int nng_http_client_get_tls(
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nng_http_client *, struct nng_tls_config **);
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// nng_http_client_connect establishes a new connection with the server
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// named in the URL used when the client was created. Once the connection
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// is established, the associated nng_http_conn object pointer is returned
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// in the first (index 0) output for the aio.
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NNG_DECL void nng_http_client_connect(nng_http_client *, nng_aio *);
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// nng_http_conn_transact is used to perform a round-trip exchange (i.e. a
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// single HTTP transaction). It will not automatically close the connection,
|
// unless some kind of significant error occurs. The caller should close
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// the connection if the aio does not complete successfully.
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NNG_DECL void nng_http_conn_transact(
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nng_http_conn *, nng_http_req *, nng_http_res *, nng_aio *);
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// nng_http_client_transact is used to execute a single transaction to a
|
// server. The connection is opened, and will be closed when the transaction is
|
// complete.
|
NNG_DECL void nng_http_client_transact(
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nng_http_client *, nng_http_req *, nng_http_res *, nng_aio *);
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#ifdef __cplusplus
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}
|
#endif
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#endif // NNG_H
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