;;; Global constants
-(define gopher-index-file-name "index")
+(define gopher-index-filename "index")
(define burrower-version "1.0.0")
(define burrower-footer
(conc "\n"
"--------------------------------------------------\n"
- "This gopher hole was dug using Burrower v" burrower-version "\n"
+ "This gopher hole was dug using Burrower v" burrower-version ".\n"
"Powered by Chicken Scheme!"))
-
;;; Server loop
;; We don't yet use worker threads here to handle requests,
(define-record config root-dir host port display-footer)
(define (run-server config)
+ (set-buffering-mode! (current-output-port) #:line)
(print "Gopher server listening on port " (config-port config) " ...")
(let ((listener (tcp-listen (config-port config))))
(let server-loop ()
(serve-selector (if (= (string-length selector) 0)
"/"
selector)
- remote-ip config)))
+ config)))
(print "... served selector '" selector "'. Closing connection."))
(o (exn)
(print-error-message o out-port)
;;; Selector type inference
-(define (has-suffix? selector . suffixes)
- (if (null? suffixes)
+(define (true-for-one? predicate values)
+ (if (null? values)
#f
- (if (string-suffix? (car suffixes) selector)
+ (if (predicate (car values))
#t
- (apply has-suffix? selector (cdr suffixes)))))
+ (true-for-one? predicate (cdr values)))))
+
+(define (has-suffix? selector . suffixes)
+ (true-for-one? (lambda (suffix)
+ (string-suffix? suffix selector))
+ suffixes))
+
+(define (has-prefix? selector . prefixes)
+ (true-for-one? (lambda (prefix)
+ (string-prefix? prefix selector))
+ prefixes))
(define (infer-selector-type selector)
(let ((l (string-downcase selector)))
((or (= (string-length l) 0) (string-suffix? "/" l)) 1)
((has-suffix? l ".txt" ".org" ".md") 0)
((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
- ((has-suffix? l "?") 7)
+ ((has-suffix? l "?.scm" "%3f.scm") 7)
+ ((has-prefix? l "url:" "/url:") 'h)
(else 9))))
;;; Selector retrieval
-(define (serve-selector raw-selector remote-ip config)
+(define (serve-selector raw-selector config)
(let* ((selector-list (string-split raw-selector "\t"))
(selector (car selector-list))
(arguments (cdr selector-list)))
(case (infer-selector-type selector)
((1) (serve-directory selector config))
((0) (serve-text-file selector config))
- ((7) (serve-query selector arguments remote-ip config))
+ ((7) (serve-query selector arguments config))
+ ((h) (serve-url selector config))
(else (serve-binary-file selector config)))))
+(define (legal-filename? filename config)
+ (and (string-prefix? (config-root-dir config)
+ (normalize-pathname filename))
+ (regular-file? filename)))
+
(define (serve-directory selector config)
- (let ((file-name (make-pathname (list (config-root-dir config) selector)
- gopher-index-file-name)))
- (if (regular-file? file-name)
+ (let ((filename (make-pathname (list (config-root-dir config) selector)
+ gopher-index-filename)))
+ (if (legal-filename? filename config)
(begin
- (with-input-from-file file-name
+ (with-input-from-file filename
(lambda ()
(let loop ((c (peek-char)))
(if (eof-object? c)
(serve-info-records (read-line)))
(loop (peek-char)))))))
(if (config-display-footer config)
- (serve-info-records burrower-footer)))
+ (serve-info-records burrower-footer))
+ (print ".\r"))
(error "Index file not found."))))
(define (serve-text-file selector config)
- (let ((file-name (make-pathname (config-root-dir config) selector)))
- (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))))
+ (let ((filename (make-pathname (config-root-dir config) selector)))
+ (if (legal-filename? filename config)
+ (begin
+ (with-input-from-file filename
+ (lambda ()
+ (for-each
+ (lambda (line)
+ (print line "\r"))
+ (read-lines))))
+ (print ".\r"))
+ (error "File not found." filename))))
(define (serve-binary-file selector config)
- (let ((file-name (make-pathname (config-root-dir config) selector)))
- (if (regular-file? file-name)
- (with-input-from-file file-name
+ (let ((filename (make-pathname (config-root-dir config) selector)))
+ (if (legal-filename? filename config)
+ (with-input-from-file filename
(lambda ()
(let loop ((b (read-byte)))
(if (eof-object? b)
(begin
(write-byte b)
(loop (read-byte)))))))
- (error "File not found." file-name))))
+ (error "File not found." filename))))
-(define (serve-query selector arguments remote-ip config)
- (let ((file-name (make-pathname (config-root-dir config)
- (conc (string-chomp selector "?") ".scm"))))
- (if (and (regular-file? file-name)
+(define (serve-query selector arguments config)
+ (let ((filename (make-pathname (config-root-dir config)
+ (string-translate* selector '(("%3f" . "?"))))))
+ (if (and (legal-filename? filename config)
(= (length arguments) 1))
- (with-input-from-file file-name
+ (with-input-from-file filename
(lambda ()
(serve-info-records
(with-selector-dir
selector config
(lambda ()
- (apply (eval (read))
- (list (car arguments) remote-ip)))))))
- (error "Invalid query."))))
+ (apply (eval (read)) arguments))))))
+ (error "Invalid query." selector arguments))))
+
+
+(define (serve-url selector config)
+ (let ((url (substring selector 4)))
+ (print
+ "<html><head><title>Redirection</title>"
+ "<meta http-equiv=\"refresh\" content=\"10; URL='" url "'\" />"
+ "</head><body>"
+ "<p>If you are seeing this page, your gopher browser does not "
+ "properly support URL directory entries or cannot follow such "
+ "links.</p>"
+ "<p>If you are viewing this page using a web browser, you should "
+ "be redirected shortly. Otherwise, you can manually open the "
+ "the follwing url:\n"
+ "\n"
+ "<a href=\"" url "\">" url "</a>\n"
+ "</body></html>")))
;;; Index rendering
(('shell command) (serve-shell-command command dir-selector config))
(('eval expression) (serve-expression expression dir-selector config))
(('url display-string url)
- (print #\h display-string "\tURL:" url "\tfake\t80\r"))
+ (print #\h display-string "\tURL:" url
+ "\t" (config-host config)
+ "\t" (config-port config) "\r"))
((type display-string selector host port)
(print type display-string "\t" selector "\t" host "\t" port "\r"))
((type display-string selector host)
dir-selector config
(lambda ()
(let-values (((in-port out-port id) (process command)))
- (serve-info-records (string-chomp (read-string #f in-port) "\n"))))))
+ (let ((string (read-string #f in-port)))
+ (if (and (not (eof-object? string))
+ (> (string-length string) 0))
+ (serve-info-records (string-chomp string "\n"))))))))
(define (serve-expression expression dir-selector config)
(with-selector-dir
(define (with-current-working-directory directory thunk)
(let ((old-wd (current-directory))
(result 'none))
- (change-directory directory)
- (set! result (thunk))
- (change-directory old-wd)
- result))
+ (condition-case
+ (begin
+ (change-directory directory)
+ (set! result (thunk))
+ (change-directory old-wd)
+ result)
+ (o (exn)
+ (change-directory old-wd)
+ (signal o)))))
(define (with-selector-dir selector config thunk)
(with-current-working-directory
(config-port-set! config (string->number (caddr args))))
(run-server config)))))))
-(main)
+;; (main)
-;; (define (test)
-;; (run-server (make-config "gopher-root" "localhost" 70 #t)))
+(define (test)
+ (run-server (make-config "gopher-root" "localhost" 70 #t)))
;; (test)
The Lambda Lab / projects / scratchy.git / blobdiff