1 files changed, 6 insertions, 1 deletions
diff --git a/gradient.py b/gradient.py
index 6d2e15f..4d01f9b 100755
--- a/gradient.py
+++ b/gradient.py
@@ -18,6 +18,11 @@ import sha
 #logger.setLevel(logging.WARNING)
 #}}}
 
+def is_color(s):
+  if re.match('(rgba?\([0-9]+,[0-9]+,[0-9]+\))|([a-zA-Z]+)|(\#[A-Ha-h0-9]+)', s):
+    return s
+  else:
+    raise ValueError
 PARAM_LIST = [ 
     "width", "height", 
     "color1", "color2", 
@@ -98,7 +103,7 @@ class Gradient:
         for key in PARAM_LIST:
             if key in form:
                 if key in ['color1', 'color2']:
-                    params[key] = form[key]
+                    params[key] = is_color(form[key])
                 else:
                     params[key] = sanitize(form[key])