forked from Telodendria/Telodendria
142 lines
4.1 KiB
Groff
142 lines
4.1 KiB
Groff
.Dd $Mdocdate: March 6 2023 $
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.Dt MATRIX 3
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.Os Telodendria Project
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.Sh NAME
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.Nm Matrix
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.Nd Functions for writing Matrix API endpoints.
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.Sh SYNOPSIS
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.In Matrix.h
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.Ft void
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.Fn MatrixHttpHandler "HttpServerContext *" "void *"
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.Ft void
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.Fn MatrixErrorCreate "MatrixError"
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.Ft HashMap *
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.Fn MatrixRateLimit "HttpServerContext *" "Db *"
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.Ft HashMap *
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.Fn MatrixGetAccessToken "HttpServerContext *" "char **"
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.Ft HashMap *
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.Fn MatrixClientWellKnown "char *" "char *"
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.Sh DESCRIPTION
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.Nm
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provides some helper functions that bind to the
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.Xr HttpServer 3
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interface and add basic Matrix functionality, turning an
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HTTP server into a Matrix homeserver.
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.Pp
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.Xr MatrixHttpHandler
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is the HTTP handler function that handles all Matrix homeserver
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functionality. It should be passed into
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.Fn HttpServerCreate ,
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and it expects that an instance of MatrixHttpHandlerArgs will also
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be provided, because that's what the void pointer is cast to.
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That structure is defined as follows:
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.Bd -literal -offset indent
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typedef struct MatrixHttpHandlerArgs
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{
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LogConfig *lc;
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TelodendriaConfig *config;
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Db *db;
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} MatrixHttpHandlerArgs;
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.Ed
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.Pp
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This structure should be populated once and then never modified again
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for the duration of the HTTP server.
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.Pp
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.Fn MatrixErrorCreate
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is a convenience function that constructs an error payload, including
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the error code and message, given just a MatrixError. MatrixErrors
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exactly follow the errors in the Matrix specification, and are
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defined as follows:
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.Bd -literal -offset indent
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typedef enum MatrixError
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{
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M_FORBIDDEN,
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M_UNKNOWN_TOKEN,
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M_MISSING_TOKEN,
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M_BAD_JSON,
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M_NOT_JSON,
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M_NOT_FOUND,
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M_LIMIT_EXCEEDED,
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M_UNKNOWN,
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M_UNRECOGNIZED,
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M_UNAUTHORIZED,
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M_USER_DEACTIVATED,
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M_USER_IN_USE,
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M_INVALID_USERNAME,
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M_ROOM_IN_USE,
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M_IVALID_ROOM_STATE,
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M_THREEPID_IN_USE,
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M_THREEPID_NOT_FOUND,
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M_THREEPID_AUTH_FAILED,
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M_THREEPID_DENIED,
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M_SERVER_NOT_TRUSTED,
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M_UNSUPPORTED_ROOM_VERSION,
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M_BAD_STATE,
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M_GUEST_ACCESS_FORBIDDEN,
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M_CAPTCHA_NEEDED,
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M_CAPTCHA_INVALID,
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M_MISSING_PARAM,
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M_INVALID_PARAM,
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M_TOO_LARGE,
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M_EXCLUSIVE,
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M_RESOURCE_LIMIT_EXCEEDED,
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M_CANNOT_LEAVE_SERVER_NOTICE_ROOM
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} MatrixError;
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.Ed
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.Pp
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.Fn MatrixRateLimit
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determines whether or not the request should be rate limited. It is
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expected that this will occur before most, if not all of the caller's
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logic.
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.Pp
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.Fn MatrixGetAccessToken
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reads the request headers and parameters, and attempts to obtain
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the access token it found. The matrix specification says that an
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access token can either be in an
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.Dv Authorization
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header, or in a
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.Dv access_token
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.Sy GET
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paramter. This function checks both, and stores the access token
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it finds in the passed character pointer.
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.Pp
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.Fn MatrixClientWellKnown
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builds a client ``well-known'' JSON object, which contains
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information about the homeserver base URL and identity server,
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both of which should be provided by the caller in that order. This
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object can be sent to a client as-is, as is the case with the
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.Pa /.well-known/matrix/client
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endpoint, or it can be added as a key in a response, as is the
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case with a few endpoints.
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.Sh RETURN VALUES
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.Pp
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.Fn MatrixErrorCreate
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returns a JSON object that represents the given error code. It can be
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immediately returned as the HTTP response body, or modified as needed.
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.Pp
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.Fn MatrixUserInteractiveAuth ,
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.Fn MatrixAuthenticate ,
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and
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.Fn MatrixRateLimit
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all return NULL when they are successful. That is, if these functions
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return NULL, then the caller can proceed assuming that all is well
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and no further action needs to be taken. If these functions do not
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return NULL, then the returned JSON object should be passed along to the
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client immediately without continuing.
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.Pp
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.Fn MatrixGetAccessToken
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returns a JSON object that should be immediately passed to the client
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if it is not NULL. This JSON object holds an error message, indicating
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that something went wrong. If this function does return NULL, then
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the access token can be checked for validity. Otherwise, the access
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token is either not valid or not provided so it should not be
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checked.
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.Pp
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.Fn MatrixClientWellKnown
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returns a JSON object, or NULL if something went wrong.
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.Sh SEE ALSO
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.Xr HttpServer 3 ,
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.Xr Log 3 ,
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.Xr TelodendriaConfig 3 ,
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.Xr Db 3
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