feat(sender): add outgoing Webmention pipeline

Scan generated h-entry documents for Webmention targets and track source
revisions and delivery state in the database.

Discover target endpoints, send Webmentions asynchronously, and reconcile
updated, removed, restored, and deleted sources across scans.

Add authenticated views for inspecting sent Webmentions and make the scanner
schedule configurable.

1 files changed, 8 insertions, 14 deletions

diff --git a/webmentions_ssg/forms/validators.py b/webmentions_ssg/forms/validators.py
index e979644..c4b5eda 100644
--- a/webmentions_ssg/forms/validators.py
+++ b/webmentions_ssg/forms/validators.py
@@ -3,11 +3,7 @@ from urllib.parse import urlsplit
 from flask import current_app
 from wtforms import ValidationError
 
-from ..url_security import (
-    AddressResolutionError,
-    NonPublicAddressError,
-    ensure_public_url,
-)
+from ..url_security import AddressResolutionError, is_public_url
 
 
 class NotEqualTo:
@@ -73,15 +69,13 @@ class PublicURL:
         self.message = message
 
     def __call__(self, form, field):
-        try:
-            ensure_public_url(field.data)
-        except (
-            AddressResolutionError,
-            NonPublicAddressError,
-        ) as exc:
-            message = self.message
+        message = self.message
 
-            if message is None:
-                message = field.gettext("URL must resolve to a public address.")
+        if message is None:
+            message = field.gettext("URL must resolve to a public address.")
 
+        try:
+            if not is_public_url(field.data):
+                raise ValidationError(message)
+        except (AddressResolutionError, ValueError) as exc:
             raise ValidationError(message) from exc