--- /dev/null
+(import (chicken tcp)
+ (chicken port)
+ (chicken io)
+ (chicken string)
+ (chicken pathname)
+ (chicken file posix)
+ (chicken time posix)
+ (chicken condition)
+ (chicken process)
+ (chicken process-context)
+ srfi-13)
+
+(define gopher-index-file-name "index")
+
+;;; Server loop
+;; We don't actually use worker threads here to handle requests,
+;; the server just blocks until the first request is finished.
+
+(define (make-server-config root-dir host port)
+ (list root-dir host port))
+
+(define (server-root-dir config) (list-ref config 0))
+(define (server-host config) (list-ref config 1))
+(define (server-port config) (list-ref config 2))
+
+(define (run-server config)
+ (print "Gopher server listening on port " (server-port config) " ...")
+ (let ((listener (tcp-listen (server-port config))))
+ (let server-loop ()
+ (let-values (((in-port out-port) (tcp-accept listener)))
+ (let* ((line (read-line in-port))
+ (selector (string-trim-both line)))
+ (let-values (((local-ip remote-ip) (tcp-addresses in-port)))
+ (print "Accepted connection from " remote-ip
+ " on " (seconds->string)))
+ (condition-case
+ (begin
+ (with-output-to-port out-port
+ (lambda ()
+ (serve-selector (if (= (string-length selector) 0)
+ "/"
+ selector)
+ config)))
+ (print "... served selector '" selector "'. Closing connection."))
+ (o (exn)
+ (print-error-message o out-port)
+ (print-error-message o)
+ (print "Error while attempting to serve selector " selector "."))))
+ (close-input-port in-port)
+ (close-output-port out-port))
+ (server-loop))
+ (tcp-close listener)))
+
+
+;;; Selector retrieval
+
+(define (directory-selector? selector)
+ (string-suffix? "/" selector))
+
+(define (text-selector? selector)
+ (apply or (map (lambda (ext) (string-suffix? ext selector))
+ '(".txt" ".org" ".md"))))
+
+(define (serve-selector selector config)
+ ((cond
+ ((directory-selector? selector) serve-directory)
+ ((text-selector? seletor) serve-text-file)
+ (else serve-binary-file))
+ selector config))
+
+(define (serve-directory path config)
+ (let ((file-name (make-pathname (list (server-root-dir config) path)
+ gopher-index-file-name)))
+ (if (regular-file? file-name)
+ (with-input-from-file file-name
+ (lambda ()
+ (let loop ((c (peek-char)))
+ (if (eof-object? c)
+ 'done
+ (begin
+ (if (eq? c #\,)
+ (begin
+ (read-char)
+ (serve-record (read) path config)
+ (read-line))
+ (serve-info-record (read-line)))
+ (loop (peek-char)))))))
+ (error "Index file not found."))))
+
+(define (serve-text-file path config)
+ (let ((file-name (make-pathname (server-root-dir config) path)))
+ (if (regular-file? file-name)
+ (with-input-from-file file-name
+ (lambda ()
+ (for-each
+ (lambda (line)
+ (print line "\r"))
+ (read-lines))))
+ (error "File not found." file-name))))
+
+(define (serve-binary-file path config)
+ (let ((file-name (make-pathname (server-root-dir config) path)))
+ (if (regular-file? file-name)
+ (with-input-from-file file-name
+ (lambda ()
+ (let loop ((b (read-byte)))
+ (if (eof-object? b)
+ 'done
+ (begin
+ (write-byte b)
+ (loop (read-byte)))))))
+ (error "File not found." file-name))))
+
+
+;;; Index rendering
+
+(define (serve-info-record info-string)
+ (print "i" info-string "\tfake\tfake\t1\r"))
+
+;;; main
+
+(define (main)
+ (let ((progname (car (argv)))
+ (args (cdr (argv))))
+ (if (or (< (length args) 2)
+ (equal? (car args) "-h")
+ (equal? (car args) "--help"))
+ (print "Usage:\n"
+ progname " -h/--help\n"
+ progname " gopher-root-dir server-hostname server-port")
+ (let ((root (car args))
+ (hostname (cadr args))
+ (port (if (= (length args) 3) (string->number (caddr args)) 70)))
+ (if port
+ (run-server (make-server-config root hostname port))
+ (error "Invalid port argument." port))))))
+
+(main)
+
+;; (define (test)
+ ;; (run-server (make-server-config "gopher-root" "localhost" 70)))
+
+;; (test)