Auto map the protocol URL field

And perform better validation when doing so.

Signed-off-by: Dan McGee <dan@archlinux.org>

mirrors/admin.py

@@ -1,4 +1,5 @@
 import re
+from urlparse import urlparse, urlunsplit
 
 from django import forms
 from django.contrib import admin
@@ -9,15 +10,26 @@ class MirrorUrlForm(forms.ModelForm):
     class Meta:
         model = MirrorUrl
     def clean_url(self):
+        # is this a valid-looking URL?
+        url_parts = urlparse(self.cleaned_data["url"])
+        if not url_parts.scheme:
+            raise forms.ValidationError("No URL scheme (protocol) provided.")
+        if not url_parts.netloc:
+            raise forms.ValidationError("No URL host provided.")
+        if url_parts.params or url_parts.query or url_parts.fragment:
+            raise forms.ValidationError(
+                "URL parameters, query, and fragment elements are not supported.")
         # ensure we always save the URL with a trailing slash
-        url = self.cleaned_data["url"].strip()
-        if url[-1] == '/':
-            return url
-        return url + '/'
+        path = url_parts.path
+        if not path.endswith('/'):
+            path += '/'
+        url = urlunsplit((url_parts.scheme, url_parts.netloc, path, '', ''))
+        return url
 
 class MirrorUrlInlineAdmin(admin.TabularInline):
     model = MirrorUrl
     form = MirrorUrlForm
+    readonly_fields = ('protocol',)
     extra = 3
 
 # ripped off from django.forms.fields, adding netmask ability

mirrors/models.py

@@ -1,4 +1,7 @@
 from django.db import models
+from django.core.exceptions import ValidationError
+
+from urlparse import urlparse
 
 TIER_CHOICES = (
     (0, 'Tier 0'),
@@ -50,11 +53,20 @@ class Meta:
 
 class MirrorUrl(models.Model):
     url = models.CharField(max_length=255)
-    protocol = models.ForeignKey(MirrorProtocol, related_name="urls")
+    protocol = models.ForeignKey(MirrorProtocol, related_name="urls",
+            editable=False)
     mirror = models.ForeignKey(Mirror, related_name="urls")
     has_ipv4 = models.BooleanField("IPv4 capable", default=True)
     has_ipv6 = models.BooleanField("IPv6 capable", default=False)
 
+    def clean(self):
+        try:
+            # Auto-map the protocol field by looking at the URL
+            protocol = urlparse(self.url).scheme
+            self.protocol = MirrorProtocol.objects.get(protocol=protocol)
+        except Exception as e:
+            raise ValidationError(e)
+
     def __unicode__(self):
         return self.url