Jaidyn Ann
fe77077c68
When a user JOINs or is in RPL_NAMREPLY, it will be saved; all rooms whch the client joins will be saved in a channel list, as well.
278 lines
11 KiB
Scheme
278 lines
11 KiB
Scheme
;;
|
|
;; Copyright 2022, Jaidyn Levesque <jadedctrl@posteo.at>
|
|
;;
|
|
;; This program is free software: you can redistribute it and/or
|
|
;; modify it under the terms of the GNU General Public License as
|
|
;; published by the Free Software Foundation, either version 3 of
|
|
;; the License, or (at your option) any later version.
|
|
;;
|
|
;; This program is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
;;
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
;;
|
|
|
|
|
|
(import scheme
|
|
(chicken io) (chicken tcp)
|
|
srfi-1 srfi-69 srfi-130
|
|
openssl)
|
|
|
|
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
;; Main
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
|
|
;; Connect to the given IRC server, returning an IRC connection object.
|
|
(define (irc:connect host port username nick #!optional (password #f) (realname #f))
|
|
(let ([conn (make-hash-table)])
|
|
(define-values (out in)
|
|
(ssl-connect* hostname: host port: port))
|
|
(hash-table-set! conn 'in in)
|
|
(hash-table-set! conn 'out out)
|
|
(hash-table-set! conn 'username username)
|
|
(hash-table-set! conn 'nick nick)
|
|
(hash-table-set! conn 'realname realname)
|
|
(hash-table-set! conn 'channels (make-hash-table))
|
|
|
|
(if password
|
|
(irc:write-cmd conn "PASS" password))
|
|
(irc:write-cmd conn "USER" username "*" "0"
|
|
(if realname realname "Jane Row"))
|
|
(irc:write-cmd conn "NICK" nick)
|
|
conn))
|
|
|
|
|
|
;; Basic loop for using an IRC connection, using two hook functions:
|
|
;; (on-command connection command params sender)
|
|
;; (on-reply connection reply-code params sender)
|
|
(define (irc:loop connection on-command on-reply)
|
|
(let* ([output (irc:read-alist connection)]
|
|
[command (alist-ref 'command output)]
|
|
[reply (alist-ref 'reply output)]
|
|
[params (alist-ref 'params output)]
|
|
[sender (alist-ref 'sender output)])
|
|
(if (and on-command (car command))
|
|
(apply on-command (append (list connection) command (list params) sender)))
|
|
(if (and on-reply (car reply))
|
|
(apply on-reply (append (list connection) reply (list params) sender)))
|
|
(irc:loop connection on-command on-reply)))
|
|
|
|
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
;; I/O
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
|
|
;; Read-in the next reply or command from the server, into a parsable alist with
|
|
;; four keys:
|
|
(define (irc:read-alist conn)
|
|
(irc:process-alist-internally
|
|
conn
|
|
(irc:line->alist (irc:read-line conn))))
|
|
|
|
|
|
;; Read a single line from the IRC server
|
|
(define (irc:read-line conn)
|
|
(read-line (hash-table-ref conn 'out)))
|
|
|
|
|
|
;; Send a specific command to the server.
|
|
(define (irc:write-cmd conn command . parameters)
|
|
(irc:write-line (apply irc:cmd->string (append `(,command) parameters))
|
|
conn))
|
|
|
|
|
|
;; Write a line to the IRC server connection.
|
|
(define (irc:write-line text connection)
|
|
(write-line text (hash-table-ref connection 'in)))
|
|
|
|
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
;; Processing/saving metadata
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
|
|
;; The user should have more-or-less total control over how to respond to
|
|
;; received messages, but ircc has to sneakily process some responses itself,
|
|
;; to ensure basic functionality (i.e., pings, chanlist, userlist, etc.)
|
|
(define (irc:process-alist-internally conn alist)
|
|
(let ([command (alist-car-ref 'command alist)]
|
|
[reply (alist-car-ref 'reply alist)]
|
|
[sender (alist-car-ref 'sender alist)]
|
|
[params (alist-ref 'params alist)])
|
|
(if command
|
|
(irc:process-command-internally conn command params sender)
|
|
(irc:process-reply-internally conn reply params sender)))
|
|
alist)
|
|
|
|
|
|
;; Handle some replies necssary for basic functionality
|
|
(define (irc:process-reply-internally conn reply params #!optional sender)
|
|
(cond [(eq? reply RPL_WELCOME)
|
|
(hash-table-set! conn 'registered #t)
|
|
(hash-table-set! conn 'nick (car params))]
|
|
[(eq? reply RPL_NAMREPLY)
|
|
(let ([channel (third params)]
|
|
[chan-symbol (second params)]
|
|
[users (cdddr params)])
|
|
(irc:channel-set! conn channel 'symbol chan-symbol)
|
|
(apply
|
|
(lambda (user)
|
|
(irc:channel-user-add! conn channel user))
|
|
users))]))
|
|
|
|
|
|
;; Handle some commands necessary for basic functionality
|
|
(define (irc:process-command-internally conn command params #!optional sender)
|
|
(cond [(string=? command "PING")
|
|
(irc:write-cmd conn "PONG" (last params))]
|
|
[(string=? command "JOIN")
|
|
(let ([room-name (car params)]
|
|
[new-user (car (string-split sender "!"))])
|
|
(if (irc:user-is-self? conn new-user)
|
|
(irc:channel-add! conn room-name))
|
|
(irc:channel-user-add! conn room-name new-user))]))
|
|
|
|
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
;; Metadata accessors
|
|
;; ——————————————————————————————————————————————————————————————————————————————
|
|
|
|
;; Return whether or not the given string (username/nick/whatever) is equivalent
|
|
;; to current user.
|
|
(define (irc:user-is-self? conn user-string)
|
|
(or (string=? (hash-table-ref conn 'username) user-string)
|
|
(string=? (hash-table-ref conn 'nick)
|
|
(car (string-split user-string "!")))
|
|
(string=? (hash-table-ref conn 'client) user-string)))
|
|
|
|
|
|
;; Add a channel of name `chan` to the internal list of channels
|
|
(define (irc:channel-add! conn chan)
|
|
(hash-table-set! (hash-table-ref conn 'channels) chan (make-hash-table))
|
|
(hash-table-set! (irc:channel-table conn chan) 'users '()))
|
|
|
|
|
|
;; Remove a channel of name `chan` from the internal list of channels
|
|
(define (irc:channel-remove! conn chan)
|
|
(hash-table-remove! (hash-table-ref conn 'channels) chan))
|
|
|
|
|
|
;; Return a list of saved channels by name
|
|
(define (irc:channels conn)
|
|
(hash-table-keys (hash-table-ref conn 'channels)))
|
|
|
|
|
|
;; Return a saved channel's table
|
|
(define (irc:channel-table conn chan)
|
|
(hash-table-ref (hash-table-ref conn 'channels) chan))
|
|
|
|
|
|
;; Get a stored value associated with a channel, by key
|
|
(define (irc:channel-get conn chan key)
|
|
(hash-table-ref (irc:channel-table conn chan) key))
|
|
|
|
|
|
;; Associate a value with a given channel, by key
|
|
(define (irc:channel-set! conn chan key value)
|
|
(hash-table-set! (irc:channel-table conn chan)
|
|
key value))
|
|
|
|
|
|
;; Returns a list of users that are stored as members of the given channel
|
|
(define (irc:channel-users conn chan)
|
|
(irc:channel-get conn chan 'users))
|
|
|
|
|
|
;; Add a user to a channel's list of users, by nick
|
|
(define (irc:channel-user-add! conn chan nick)
|
|
(irc:channel-set!
|
|
conn chan 'users
|
|
(append (irc:channel-get conn chan 'users)
|
|
(list nick))))
|
|
|
|
|
|
;; Remove a user from a channel's list of users, by nick
|
|
(define (irc:channel-user-del! conn chan nick)
|
|
(irc:channel-set!
|
|
conn chan 'users
|
|
(filter (lambda (a-nick)
|
|
(not (string=? nick a-nick)))
|
|
(irc:channel-users conn name))))
|
|
|
|
|
|
;; —————————————————————————————————————————————————————————————————————————————
|
|
;; Parsing lines/commands
|
|
;; —————————————————————————————————————————————————————————————————————————————
|
|
|
|
;; Construct a string to write to IRC for the given command and parameters.
|
|
(define (irc:cmd->string command . parameters)
|
|
(let ([parameters
|
|
(append (reverse (cdr (reverse parameters)))
|
|
`(,(string-append ":" (last parameters))))])
|
|
(string-append
|
|
command
|
|
" "
|
|
(reduce-right
|
|
(lambda (a b)
|
|
(string-append a " " b))
|
|
#f
|
|
parameters))))
|
|
|
|
|
|
;; Convert a string to a `msg` alist, with keys 'command', 'reply', 'params',
|
|
;; and 'sender'.
|
|
(define (irc:line->alist str)
|
|
(let* ([colon-split (string-split str " :")]
|
|
[last-column (reduce string-append #f (cdr colon-split))] ;; for post-colon colons
|
|
[other-columns (string-split (car colon-split) " ")]
|
|
[sender (if (eq? #\:
|
|
(car (string->list (car other-columns))))
|
|
(string-drop (car other-columns) 1)
|
|
#f)]
|
|
[command (if sender
|
|
(cadr other-columns)
|
|
(car other-columns))]
|
|
[reply (string->number command)]
|
|
[params (append (if sender (cddr other-columns) (cdr other-columns))
|
|
(list last-column))])
|
|
`((command ,(if (not reply) command #f))
|
|
(reply ,reply)
|
|
,(append '(params) params)
|
|
(sender ,sender))))
|
|
|
|
|
|
;; —————————————————————————————————————————————————————————————————————————————
|
|
;; Misc. helpers
|
|
;; —————————————————————————————————————————————————————————————————————————————
|
|
|
|
;; Just car's the value of alist-ref (if it exists)
|
|
(define (alist-car-ref key alist)
|
|
(let ([value (alist-ref key alist)])
|
|
(if value
|
|
(car value)
|
|
#f)))
|
|
|
|
|
|
;; —————————————————————————————————————————————————————————————————————————————
|
|
;; IRC constants
|
|
;; —————————————————————————————————————————————————————————————————————————————
|
|
|
|
(define RPL_WELCOME 1)
|
|
(define RPL_WHOISUSER 311)
|
|
(define RPL_ENDOFWHO 315)
|
|
(define RPL_ENDOFWHOIS 318)
|
|
(define RPL_LIST 322)
|
|
(define RPL_LISTEND 323)
|
|
(define RPL_TOPIC 332)
|
|
(define RPL_WHOREPLY 352)
|
|
(define RPL_NAMREPLY 353)
|
|
(define RPL_MOTD 372)
|
|
(define RPL_MOTDSTART 375)
|
|
(define RPL_ENDOFMOTD 376)
|
|
(define ERR_NONICKNAMEGIVEN 431)
|
|
(define ERR_ERRONEUSNICKNAME 432)
|
|
(define ERR_NICKNAMEINUSE 433)
|