X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=scratchy.git;a=blobdiff_plain;f=burrow.scm;fp=burrow.scm;h=0000000000000000000000000000000000000000;hp=bb21e3af7bfefdd730f553fdf0924dde87e02a0b;hb=4baffb335c037973f3748b8e98bd74b61fc82ec8;hpb=d3aae97b2523a554f31f7a6ff6468cf0ef6046d9

diff --git a/burrow.scm b/burrow.scm
deleted file mode 100644
index bb21e3a..0000000
--- a/burrow.scm
+++ /dev/null
@@ -1,263 +0,0 @@
-(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-1 srfi-13 matchable)
-
-;;; Global constants
-
-(define gopher-index-file-name "index")
-
-(define burrow-version "1.0.0")
-
-(define burrow-footer
-  (conc "\n"
-        "--------------------------------------------------\n"
-        "Served by Burrow Gopher Server v" burrow-version "\n"
-        "Powered by Chicken Scheme!"))
-
-
-;;; Server loop
-
-;; We don't yet use worker threads here to handle requests,
-;; the server just blocks until the first request is finished.
-;; While we should fix this, it's actually probably okay, as
-;; we genuinely don't expect a huge flood of gopher traffic. :-(
-
-(define-record config root-dir host port display-footer)
-
-(define (run-server config)
-  (print "Gopher server listening on port " (config-port config) " ...")
-  (let ((listener (tcp-listen (config-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)
-                                      remote-ip 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 type inference
-
-(define (has-suffix? selector . suffixes)
-  (if (null? suffixes)
-      #f
-      (if (string-suffix? (car suffixes) selector)
-          #t
-          (apply has-suffix? selector (cdr suffixes)))))
-
-(define (infer-selector-type selector)
-  (let ((l (string-downcase selector)))
-    (cond
-     ((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)
-     (else 9))))
-
-
-;;; Selector retrieval
-
-(define (serve-selector raw-selector remote-ip 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))
-      (else (serve-binary-file selector config)))))
-
-(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)
-        (begin
-          (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) selector config)
-                            (read-line))
-                          (serve-info-records (read-line)))
-                      (loop (peek-char)))))))
-          (if (config-display-footer config)
-              (serve-info-records burrow-footer)))
-        (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))))
-
-(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
-          (lambda ()
-            (let loop ((b (read-byte)))
-              (if (eof-object? b)
-                  'done
-                  (begin
-                    (write-byte b)
-                    (loop (read-byte)))))))
-        (error "File not found." file-name))))
-
-(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)
-             (= (length arguments) 1))
-        (with-input-from-file file-name
-          (lambda ()
-            (serve-info-records
-             (with-selector-dir
-              selector config
-              (lambda ()
-                (apply (eval (read))
-                       (list (car arguments) remote-ip)))))))
-        (error "Invalid query."))))
-
-
-;;; Index rendering
-
-(define (serve-info-records string)
-  (for-each
-   (lambda (line)
-     (print* "i")
-     (for-each (lambda (char)
-                 (print* (if (eq? char #\tab)
-                             "    "
-                             char)))
-               (string->list line))
-     (print "\tfake\tfake\t1\r"))
-   (string-split string "\n" #t)))
-
-(define (serve-record record dir-selector config)
-  (match record
-    (('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"))
-    ((type display-string selector host port)
-     (print type display-string "\t" selector "\t" host "\t" port "\r"))
-    ((type display-string selector host)
-     (serve-record (list type display-string selector host 70)
-                   dir-selector config))
-    ((type display-string selector)
-     (serve-record (list type display-string
-                         (make-pathname dir-selector selector)
-                         (config-host config) (config-port config))
-                   dir-selector config))
-    ((display-string selector)
-     (serve-record (list (infer-selector-type selector) display-string selector)
-                   dir-selector config))
-    ((selector)
-     (serve-record (list (infer-selecto-type selector) selector)
-                   dir-selector config))
-    (else (error "Unknown record type."))))
-
-(define (serve-shell-command command dir-selector config)
-  (with-selector-dir
-   dir-selector config
-   (lambda ()
-     (let-values (((in-port out-port id) (process command)))
-       (serve-info-records (string-chomp (read-string #f in-port) "\n"))))))
-
-(define (serve-expression expression dir-selector config)
-  (with-selector-dir
-   dir-selector config
-   (lambda ()
-     (serve-info-records (conc (eval expression))))))
-
-
-;;; Utility methods
-
-(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))
-
-(define (with-selector-dir selector config thunk)
-  (with-current-working-directory
-   (make-pathname (config-root-dir config)
-                  (pathname-directory selector)) thunk))
-
-;;; main
-
-(define (print-usage progname)
-  (print "Usage:\n"
-         progname " -h/--help\n"
-         progname " [-n/--no-footer] gopher-root-dir server-hostname [server-port]\n"
-         "\n"
-         "The -n option tells the server to not display a directory footer."))
-
-(define (main)
-  (let* ((progname (car (argv)))
-         (args (cdr (argv)))
-         (config (make-config '() '() 70 #t)))
-
-    (if (or (null? args)
-            (equal? (car args) "-h")
-            (equal? (car args) "--help"))
-        (print-usage progname)
-        (begin
-          (if (or (equal? (car args) "-n")
-                  (equal? (car args) "--no-footer"))
-              (begin
-                (config-display-footer-set! config #f)
-                (set! args (cdr args))))
-          (if (or (< (length args) 2)
-                  (> (length args) 3))
-              (print-usage progname)
-              (begin
-                (config-root-dir-set! config (car args))
-                (config-host-set! config (cadr args))
-                (if (= (length args) 3)
-                    (config-port-set! config (string->number (caddr args))))
-                (run-server config)))))))
-
-(main)
-
-;; (define (test)
-;;   (run-server (make-config "gopher-root" "localhost" 70 #t)))
-
-;; (test)