Validate link form field when adding a comment online

diff --git a/blitiri.cgi b/blitiri.cgi
index d825efc0d0bdd46c086fbc113c67317791c4f519..19c63ea2e850c829b05fe98e99b09d4c507ef1d9 100755 (executable)
--- a/blitiri.cgi
+++ b/blitiri.cgi
@@ -399,6 +399,24 @@ def validate_rst(rst):
                        desc = desc[:-1]
                return (line, desc, context)
 
+def valid_link(link):
+       import re
+       mail_re = r"^[^ \t\n\r@<>()]+@[a-z0-9][a-z0-9\.\-_]*\.[a-z]+$"
+       scheme_re = r'^[a-zA-Z]+:'
+       url_re = r'^(?:[a-z0-9\-]+|[a-z0-9][a-z0-9\-\.\_]*\.[a-z]+)' \
+                       r'(?::[0-9]+)?(?:/.*)?$'
+       scheme = ''
+       rest = link
+       if re.match(scheme_re, link, re.I):
+               scheme, rest = link.split(':', 1)
+       if (not scheme or scheme == 'mailto') and re.match(mail_re, rest, re.I):
+               return 'mailto:' + link
+       if not scheme and re.match(url_re, rest, re.I):
+               return 'http://' + rest
+       if scheme:
+               return link
+       return None
+
 def sanitize(obj):
        if isinstance(obj, basestring):
                return cgi.escape(obj, True)
@@ -1055,6 +1073,14 @@ def handle_cgi():
                if not form_data.author:
                        form_data.author_error = 'please, enter your name'
                        valid = False
+               if form_data.link:
+                       link = valid_link(form_data.link)
+                       if link:
+                               form_data.link = link
+                       else:
+                               form_data.link_error = 'please, enter a ' \
+                                               'valid link'
+                               valid = False
                if not form_data.body:
                        form_data.body_error = 'please, write a comment'
                        valid = False