9 (chicken process-context)
11 uri-common tcp6 openssl)
14 root-dir host port certfile keyfile)
17 '(("gmi" "text/gemini" "charset=utf-8")
18 ("txt" "text/plain" "charset=utf-8")))
20 (define (process-request config request-line)
21 (let ((uri (uri-normalize-path-segments (absolute-uri request-line))))
23 ((not (eq? (uri-scheme uri) 'gemini))
24 (fail-permanent "Unsupported scheme."))
26 (fail-permanent "URL lacks host name."))
27 ((not (equal? (uri-host uri) (config-host config)))
28 (fail-permanent "Proxy requests forbidden."))
29 ((uri-path-relative? uri)
30 (fail-permanent "Path must be absolute."))
31 ((not (document-available? config uri))
32 (fail-permanent "Document not found."))
34 (serve-document config uri)))))
36 (define (fail-permanent reason)
37 (print "50 " reason "\r"))
39 (define (document-available? config uri)
40 (file-exists? (document-path config uri)))
42 (define (document-path config uri)
43 (let* ((crumbs (reverse (cons (config-root-dir config) (cdr (uri-path uri)))))
44 (path (make-pathname (reverse (cdr crumbs)) (car crumbs))))
45 (if (directory-exists? path)
46 (make-pathname path "index.gmi")
49 (define (serve-document config uri)
50 (let* ((path (document-path config uri))
51 (ext (pathname-extension path))
52 (mime-detected (assoc ext file-types))
53 (mime (if mime-detected mime-detected (assoc "txt" file-types)))
54 (mime-type (cadr mime)))
55 (print "20 " (string-intersperse (cdr mime) ";") "\r")
57 ((equal? mime-type "text/gemini") (serve-dynamic-gemini path))
58 ((equal? mime-type "text/plain") (serve-text-plain path))
59 (else (serve-binary)))))
61 (define (serve-text-plain path)
62 (with-input-from-file path
64 (let loop ((str (read-string)))
65 (unless (eof-object? str)
67 (loop (read-string)))))))
69 (define (serve-dynamic-gemini path)
70 (with-input-from-file path
72 (let loop ((c (peek-char)))
79 (serve-dynamic-element (read) (pathname-directory path))
82 (loop (peek-char))))))))
84 (define (serve-dynamic-element element working-directory)
87 (with-current-working-directory
92 (with-current-working-directory
95 (let-values (((in-port out-port id) (process command)))
96 (let ((string (read-string #f in-port)))
97 (unless (eof-object? string)
99 (close-input-port in-port)
100 (close-output-port out-port))))))
101 (else (error "Unknown element type."))))
103 (define (with-current-working-directory directory thunk)
104 (let ((old-wd (current-directory))
108 (change-directory directory)
109 (set! result (thunk))
110 (change-directory old-wd)
113 (change-directory old-wd)
117 (define (run-server config)
118 (define listener (ssl-listen* hostname: (config-host config)
119 port: (config-port config)
120 certificate: (config-certfile config)
121 private-key: (config-keyfile config)))
123 (print "Host: '" (config-host config) "'\n"
124 "Port: '" (config-port config) "'\n"
125 "Root directory: '" (config-root-dir config) "'\n"
126 "Cert file: '" (config-certfile config) "'\n"
127 "Key file: '" (config-keyfile config) "'\n"
129 "Gemini server listening ...")
131 (server-loop listener config))
133 (define (server-loop listener config)
134 (let-values (((in-port out-port) (ssl-accept listener)))
135 (let-values (((local-ip remote-ip) (tcp-addresses (ssl-port->tcp-port in-port))))
136 (print "Accepted connection from " remote-ip
137 " on " (seconds->string))
139 (let ((request-line (read-line in-port)))
140 (print* "Serving request '" request-line "' ... ")
141 (with-output-to-port out-port
143 (process-request config request-line)))
146 (print-error-message o))))
147 (close-input-port in-port)
148 (close-output-port out-port))
149 (server-loop listener config))
152 (define (print-usage progname)
153 (print "Usage: " progname " [-h] [-p port] server-root-dir hostname certfile keyfile"))
156 (let* ((progname (pathname-file (car (argv))))
157 (config (make-config #f #f 1965 #f #f)))
158 (if (null? (cdr (argv)))
159 (print-usage progname)
160 (let loop ((args (cdr (argv))))
161 (let ((this-arg (car args))
162 (rest-args (cdr args)))
163 (if (string-prefix? "-" this-arg)
165 ((or (equal? this-arg "-h")
166 (equal? this-arg "--help"))
167 (print-usage progname))
168 ((or (equal? this-arg "-p")
169 (equal? this-arg "--port"))
170 (config-port-set! config (string->bumber (car rest-args)))
171 (loop (cdr rest-args)))
173 (print-usage progname)))
175 ((root-dir host certfile keyfile)
176 (config-root-dir-set! config root-dir)
177 (config-host-set! config host)
178 (config-certfile-set! config certfile)
179 (config-keyfile-set! config keyfile)
182 (print "One or more invalid arguments.")
183 (print-usage progname)))))))))