10 (chicken process-context)
11 srfi-1 srfi-13 matchable)
13 (define gopher-index-file-name "index")
16 ;; We don't actually use worker threads here to handle requests,
17 ;; the server just blocks until the first request is finished.
19 (define (make-server-config root-dir host port)
20 (list root-dir host port))
22 (define (server-root-dir config) (list-ref config 0))
23 (define (server-host config) (list-ref config 1))
24 (define (server-port config) (list-ref config 2))
26 (define (run-server config)
27 (print "Gopher server listening on port " (server-port config) " ...")
28 (let ((listener (tcp-listen (server-port config))))
30 (let-values (((in-port out-port) (tcp-accept listener)))
31 (let* ((line (read-line in-port))
32 (selector (string-trim-both line)))
33 (let-values (((local-ip remote-ip) (tcp-addresses in-port)))
34 (print "Accepted connection from " remote-ip
35 " on " (seconds->string)))
38 (with-output-to-port out-port
40 (serve-selector (if (= (string-length selector) 0)
44 (print "... served selector '" selector "'. Closing connection."))
46 (print-error-message o out-port)
47 (print-error-message o)
48 (print "Error while attempting to serve selector " selector "."))))
49 (close-input-port in-port)
50 (close-output-port out-port))
52 (tcp-close listener)))
54 ;;; Selector type inference
56 (define (has-suffix? selector . suffixes)
59 (if (string-suffix? (car suffixes) selector)
61 (apply has-suffix? selector (cdr suffixes)))))
63 (define (infer-selector-type selector)
64 (let ((l (string-downcase selector)))
66 ((or (= (string-length l) 0) (string-suffix? "/" l)) 1)
67 ((has-suffix? l ".txt" ".org" ".md") 0)
68 ((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
71 ;;; Selector retrieval
73 (define (serve-selector selector config)
74 ((case (infer-selector-type selector)
77 (else serve-binary-file))
80 (define (serve-directory path config)
81 (let ((file-name (make-pathname (list (server-root-dir config) path)
82 gopher-index-file-name)))
83 (if (regular-file? file-name)
84 (with-input-from-file file-name
86 (let loop ((c (peek-char)))
93 (serve-record (read) path config)
95 (serve-info-record (read-line)))
96 (loop (peek-char)))))))
97 (error "Index file not found."))))
99 (define (serve-text-file path config)
100 (let ((file-name (make-pathname (server-root-dir config) path)))
101 (if (regular-file? file-name)
102 (with-input-from-file file-name
108 (error "File not found." file-name))))
110 (define (serve-binary-file path config)
111 (let ((file-name (make-pathname (server-root-dir config) path)))
112 (if (regular-file? file-name)
113 (with-input-from-file file-name
115 (let loop ((b (read-byte)))
120 (loop (read-byte)))))))
121 (error "File not found." file-name))))
126 (define (serve-info-record info-string)
128 (for-each (lambda (char)
129 (print* (if (eq? char #\tab)
132 (string->list info-string))
133 (print "\tfake\tfake\t1\r"))
135 (define (serve-record record path config)
137 (('shell command) (serve-shell-command command))
138 ((type display-string selector host port)
139 (print type display-string "\t" selector "\t" host "\t" port "\r"))
140 ((type display-string selector host)
141 (serve-record (list type display-string selector host 70)
143 ((type display-string selector)
144 (serve-record (list type display-string selector
145 (server-host config) (server-port config))
147 ((display-string selector)
148 (serve-record (list (infer-selector-type selector) display-string selector)
151 (serve-record (list (infer-selecto-type selector) selector)
153 (else (error "Unknown record type."))))
155 (define (serve-shell-command command)
156 (let-values (((in-port out-port id) (process command)))
157 (for-each serve-info-record (read-lines in-port))))
162 (let ((progname (car (argv)))
164 (if (or (< (length args) 2)
165 (equal? (car args) "-h")
166 (equal? (car args) "--help"))
168 progname " -h/--help\n"
169 progname " gopher-root-dir server-hostname server-port")
170 (let ((root (car args))
171 (hostname (cadr args))
172 (port (if (= (length args) 3) (string->number (caddr args)) 70)))
174 (run-server (make-server-config root hostname port))
175 (error "Invalid port argument." port))))))
180 ;; (run-server (make-server-config "gopher-root" "localhost" 70)))