(chicken io)
(chicken string)
(chicken pathname)
- (chicken file posix)
+ (chicken file)
(chicken time posix)
(chicken condition)
(chicken process)
(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
(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 ()
(define (infer-selector-type selector)
(let ((l (string-downcase selector)))
(cond
- ((or (= (string-length l) 0) (string-suffix? "/" l)) 1)
+ ((or (= (string-length l) 0)
+ (string-suffix? "/" l)
+ (string-contains l ":")) 1)
((has-suffix? l ".txt" ".org" ".md") 0)
((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
- ((has-suffix? l "?.scm") 7)
+ ((has-suffix? l "?" "%3f") 7)
((has-prefix? l "url:" "/url:") 'h)
(else 9))))
(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 config))
- ((h) (serve-url selector config))
- (else (serve-binary-file selector config)))))
+ (if (string-contains selector ":")
+ (let ((l (string-split selector ":")))
+ (serve-script (car l) (cdr l) config))
+ (case (infer-selector-type selector)
+ ((1) (serve-directory-file selector config))
+ ((7) (let ((l (string-split selector "?")))
+ (serve-script (car l) arguments config)))
+ ((0) (serve-text-file selector 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)))
+ (file-exists? filename)
+ (not (directory-exists? filename))
+ (file-readable? filename)))
-(define (serve-directory selector config)
+(define (legal-script-filename? filename config)
+ (and (legal-filename? filename config)
+ (string-suffix? ".scm" filename)
+ (file-executable? filename)))
+
+(define (serve-directory-file selector config)
(let ((filename (make-pathname (list (config-root-dir config) selector)
gopher-index-filename)))
(if (legal-filename? filename config)
(serve-info-records (read-line)))
(loop (peek-char)))))))
(if (config-display-footer config)
- (serve-info-records burrower-footer)))
- (error "Index file not found."))))
+ (serve-info-records burrower-footer))
+ (print ".\r"))
+ (error "No legal index file not found."))))
(define (serve-text-file selector config)
(let ((filename (make-pathname (config-root-dir config) selector)))
(if (legal-filename? filename config)
- (with-input-from-file filename
- (lambda ()
- (for-each
- (lambda (line)
- (print line "\r"))
- (read-lines))))
+ (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)
(loop (read-byte)))))))
(error "File not found." filename))))
-(define (serve-query selector arguments config)
- (let ((filename (make-pathname (config-root-dir config) selector)))
- (if (and (legal-filename? filename config)
- (= (length arguments) 1))
- (with-input-from-file filename
- (lambda ()
- (serve-info-records
- (with-selector-dir
- selector config
- (lambda ()
- (apply (eval (read)) arguments))))))
- (error "Invalid query." selector arguments))))
-
-
(define (serve-url selector config)
(let ((url (substring selector 4)))
(print
- "If you are seeing this page, your gopher browser does not\r\n"
- "properly support URL directory entries or cannot follow such\r\n"
- "links. To view the link you requested, use a web browser to\r\n"
- "open the follwing url:\r\n"
- "\r\n"
- url "\r\n")))
+ "<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>")))
+
+(define (serve-script selector arguments config)
+ (let ((filename (make-pathname (config-root-dir config) selector)))
+ (if (legal-script-filename? filename config)
+ (let* ((sexp (with-input-from-file filename read))
+ (script-result (with-selector-dir
+ selector config
+ (lambda ()
+ (apply (eval sexp) arguments)))))
+ (when (pair? script-result)
+ (serve-records script-result
+ (pathname-directory selector) config)
+ (print ".\r")))
+ (error "No legal index script not found." filename))))
;;; Index rendering
+(define (serve-records records dir-selector config)
+ (for-each
+ (lambda (record)
+ (serve-record record dir-selector config))
+ records))
+
(define (serve-info-records string)
(for-each
(lambda (line)
(define (serve-record record dir-selector config)
(match record
+ ((? string?) (serve-info-records record))
(('shell command) (serve-shell-command command dir-selector config))
(('eval expression) (serve-expression expression dir-selector config))
(('url display-string url)
(serve-record (list (infer-selector-type selector) display-string selector)
dir-selector config))
((selector)
- (serve-record (list (infer-selecto-type selector) selector)
+ (serve-record (list (infer-selector-type selector) selector)
dir-selector config))
(else (error "Unknown record type."))))
(let ((string (read-string #f in-port)))
(if (and (not (eof-object? string))
(> (string-length string) 0))
- (serve-info-records (string-chomp string "\n"))))))))
+ (serve-info-records (string-chomp string "\n")))
+ (close-input-port in-port)
+ (close-output-port out-port))))))
(define (serve-expression expression dir-selector config)
(with-selector-dir
dir-selector config
(lambda ()
- (serve-info-records (conc (eval expression))))))
+ (serve-records (eval expression) dir-selector config))))
;;; Utility methods
(make-pathname (config-root-dir config)
(pathname-directory selector)) thunk))
-;;; main
+
+;;; Main
(define (print-usage progname)
(print "Usage:\n"
(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)
+(test)
The Lambda Lab / projects / scratchy.git / blobdiff