X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=scratchy.git;a=blobdiff_plain;f=burrower.scm;h=4d00253086b5bb7c3b6ad02037c9c293d8b0ae72;hp=a03c266c7c55fc7ae6b4dc0e9b827f51f6de0cd8;hb=d7925f64bd746c0cdb935654a335a9c8443dd422;hpb=882fc8361b2d9cfe1d5c72b137a8474f902f36a0

diff --git a/burrower.scm b/burrower.scm
index a03c266..4d00253 100644
--- a/burrower.scm
+++ b/burrower.scm
@@ -28,7 +28,6 @@
         "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,
@@ -55,7 +54,7 @@
                       (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)
@@ -69,12 +68,22 @@
 
 ;;; 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)))
@@ -83,19 +92,21 @@
      ((has-suffix? l ".txt" ".org" ".md") 0)
      ((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
      ((has-suffix? l "?.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 (serve-directory selector config)
@@ -144,7 +155,7 @@
                     (loop (read-byte)))))))
         (error "File not found." file-name))))
 
-(define (serve-query selector arguments remote-ip config)
+(define (serve-query selector arguments config)
   (let ((file-name (make-pathname (config-root-dir config) selector)))
     (if (and (regular-file? file-name)
              (= (length arguments) 1))
@@ -154,9 +165,19 @@
              (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
+     "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")))
 
 
 ;;; Index rendering
@@ -178,7 +199,9 @@
     (('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)
@@ -202,7 +225,10 @@
    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