10 (chicken process-context)
11 srfi-1 srfi-13 matchable)
13 (define gopher-index-file-name "index")
15 (define burrow-version "1.0.0")
19 "--------------------------------------------------\n"
20 "Served by Burrow Gopher Server v" burrow-version "\n"
21 "Powered by Chicken Scheme!"))
24 ;; We don't actually use worker threads here to handle requests,
25 ;; the server just blocks until the first request is finished.
27 (define-record config root-dir host port display-footer)
29 (define (run-server config)
30 (print "Gopher server listening on port " (config-port config) " ...")
31 (let ((listener (tcp-listen (config-port config))))
33 (let-values (((in-port out-port) (tcp-accept listener)))
34 (let* ((line (read-line in-port))
35 (selector (string-trim-both line)))
36 (let-values (((local-ip remote-ip) (tcp-addresses in-port)))
37 (print "Accepted connection from " remote-ip
38 " on " (seconds->string)))
41 (with-output-to-port out-port
43 (serve-selector (if (= (string-length selector) 0)
47 (print "... served selector '" selector "'. Closing connection."))
49 (print-error-message o out-port)
50 (print-error-message o)
51 (print "Error while attempting to serve selector " selector "."))))
52 (close-input-port in-port)
53 (close-output-port out-port))
55 (tcp-close listener)))
57 ;;; Selector type inference
59 (define (has-suffix? selector . suffixes)
62 (if (string-suffix? (car suffixes) selector)
64 (apply has-suffix? selector (cdr suffixes)))))
66 (define (infer-selector-type selector)
67 (let ((l (string-downcase selector)))
69 ((or (= (string-length l) 0) (string-suffix? "/" l)) 1)
70 ((has-suffix? l ".txt" ".org" ".md") 0)
71 ((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
74 ;;; Selector retrieval
76 (define (serve-selector selector config)
77 ((case (infer-selector-type selector)
80 (else serve-binary-file))
83 (define (serve-directory path config)
84 (let ((file-name (make-pathname (list (config-root-dir config) path)
85 gopher-index-file-name)))
86 (if (regular-file? file-name)
88 (with-input-from-file file-name
90 (let loop ((c (peek-char)))
97 (serve-record (read) path config)
99 (serve-info-records (read-line)))
100 (loop (peek-char)))))))
101 (if (config-display-footer config)
102 (serve-info-records burrow-footer)))
103 (error "Index file not found."))))
105 (define (serve-text-file path config)
106 (let ((file-name (make-pathname (config-root-dir config) path)))
107 (if (regular-file? file-name)
108 (with-input-from-file file-name
114 (error "File not found." file-name))))
116 (define (serve-binary-file path config)
117 (let ((file-name (make-pathname (config-root-dir config) path)))
118 (if (regular-file? file-name)
119 (with-input-from-file file-name
121 (let loop ((b (read-byte)))
126 (loop (read-byte)))))))
127 (error "File not found." file-name))))
132 (define (serve-info-records string)
136 (for-each (lambda (char)
137 (print* (if (eq? char #\tab)
141 (print "\tfake\tfake\t1\r"))
142 (string-split string "\n" #t)))
144 (define (serve-record record path config)
146 (('shell command) (serve-shell-command command))
147 (('eval expression) (serve-expression expression))
148 ((type display-string selector host port)
149 (print type display-string "\t" selector "\t" host "\t" port "\r"))
150 ((type display-string selector host)
151 (serve-record (list type display-string selector host 70)
153 ((type display-string selector)
154 (serve-record (list type display-string selector
155 (config-host config) (config-port config))
157 ((display-string selector)
158 (serve-record (list (infer-selector-type selector) display-string selector)
161 (serve-record (list (infer-selecto-type selector) selector)
163 (else (error "Unknown record type."))))
165 (define (serve-shell-command command)
166 (let-values (((in-port out-port id) (process command)))
167 (serve-info-records (string-chomp (read-string #f in-port) "\n"))))
169 (define (serve-expression expression)
170 (serve-info-records (conc (eval expression))))
174 (define (print-usage progname)
176 progname " -h/--help\n"
177 progname " [-n/--no-footer] gopher-root-dir server-hostname [server-port]\n"
179 "The -n option tells the server to not display a directory footer."))
182 (let* ((progname (car (argv)))
184 (config (make-config '() '() 70 #t)))
187 (equal? (car args) "-h")
188 (equal? (car args) "--help"))
189 (print-usage progname)
191 (if (or (equal? (car args) "-n")
192 (equal? (car args) "--no-footer"))
194 (config-display-footer-set! config #f)
195 (set! args (cdr args))))
197 (if (or (< (length args) 2)
199 (print-usage progname)
201 (config-root-dir-set! config (car args))
202 (config-host-set! config (cadr args))
203 (if (= (length args) 3)
204 (config-port-set! config (string->number (caddr args))))
205 (run-server config)))))))
210 ;; (run-server (make-config "gopher-root" "localhost" 70 #t)))