X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=scratchy.git;a=blobdiff_plain;f=burrower.scm;h=2886a07d75f1ee211f2e3eaca2edbe7294d2e6cd;hp=4d00253086b5bb7c3b6ad02037c9c293d8b0ae72;hb=42a6a2732ebb0484460f089ca87acfe74d7fbb6b;hpb=d7925f64bd746c0cdb935654a335a9c8443dd422

diff --git a/burrower.scm b/burrower.scm
index 4d00253..2886a07 100644
--- a/burrower.scm
+++ b/burrower.scm
@@ -18,14 +18,14 @@
 
 ;;; 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
@@ -38,6 +38,7 @@
 (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 ()
@@ -91,7 +92,7 @@
      ((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 "?.scm") 7)
+     ((has-suffix? l "?.scm" "%3f.scm") 7)
      ((has-prefix? l "url:" "/url:") 'h)
      (else 9))))
 
@@ -109,12 +110,17 @@
       ((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)
@@ -128,24 +134,27 @@
                           (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)
@@ -153,13 +162,14 @@
                   (begin
                     (write-byte b)
                     (loop (read-byte)))))))
-        (error "File not found." file-name))))
+        (error "File not found." filename))))
 
 (define (serve-query selector arguments config)
-  (let ((file-name (make-pathname (config-root-dir config) selector)))
-    (if (and (regular-file? file-name)
+  (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
@@ -172,12 +182,18 @@
 (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>")))
 
 
 ;;; Index rendering
@@ -291,9 +307,9 @@
                     (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)