feat(ui): Add warning signpost for old snaps

templates/store/snap-details/_details.html

@@ -16,6 +16,15 @@ <h3 class="p-muted-heading">Last updated</h3>
       <li>{{ updates[1]["released-at-display"] }} - <small>{{ updates[1]["track"] }}/{{ updates[1]["risk"] }}</small></li>
     {% endif %}
   </ul>
+  {% if old_snap_info %}
+  <div class="p-notification--caution is-borderless">
+    <div class="p-notification__content">
+      <p class="p-notification__message">
+        This snap hasn't been updated in a while. It might be unmaintained and have stability or security issues.
+      </p>
+    </div>
+  </div>
+  {% endif %}
   <hr class="p-rule--muted">
 {% endif %}
 

tests/store/tests_public_logic.py

@@ -482,3 +482,72 @@ def test_get_last_updated_versions(self):
         self.assertEqual(
             result, [latest_edge["channel"], latest_stable["channel"]]
         )
+
+    def test_is_snap_old_empty_date(self):
+        """Test that empty or None date returns not old"""
+        result = logic.is_snap_old(None)
+        self.assertFalse(result)
+
+        result = logic.is_snap_old("")
+        self.assertFalse(result)
+
+    def test_is_snap_old_invalid_date(self):
+        """Test that invalid date returns not old"""
+        result = logic.is_snap_old("invalid-date")
+        self.assertFalse(result)
+
+    @freeze_time("2024-01-01")
+    def test_is_snap_old_recent_snap(self):
+        """Test that a recently updated snap is not considered old"""
+        recent_date = "2023-06-01T10:00:00Z"
+        result = logic.is_snap_old(recent_date)
+        self.assertFalse(result)
+
+    @freeze_time("2024-01-02T10:00:00Z")
+    def test_is_snap_old_exactly_two_years(self):
+        """Test that a snap updated exactly 2 years ago is considered old"""
+        old_date = "2022-01-02T10:00:00Z"  # Exactly 2 years ago
+        result = logic.is_snap_old(old_date)
+        self.assertTrue(result)
+
+    @freeze_time("2024-01-02")
+    def test_is_snap_old_very_old_snap(self):
+        """Test that a very old snap is considered old"""
+        very_old_date = "2020-01-01T10:00:00Z"
+        result = logic.is_snap_old(very_old_date)
+        self.assertTrue(result)
+
+    @freeze_time("2024-01-01")
+    def test_is_snap_old_just_under_two_years(self):
+        """Test that a snap updated just under 2 years ago is not old"""
+        almost_old_date = "2022-02-01T10:00:00Z"
+        result = logic.is_snap_old(almost_old_date)
+        self.assertFalse(result)
+
+    @freeze_time("2024-01-02")
+    def test_is_snap_old_custom_threshold(self):
+        """Test that custom threshold works correctly"""
+        date_one_year_ago = "2022-12-01T10:00:00Z"  # Over 1 year ago
+
+        # With default threshold (2 years), should not be old
+        result = logic.is_snap_old(date_one_year_ago)
+        self.assertFalse(result)
+
+        # With custom threshold (1 year), should be old
+        result = logic.is_snap_old(date_one_year_ago, old_threshold_years=1)
+        self.assertTrue(result)
+
+    def test_is_snap_old_different_date_formats(self):
+        """Test that different ISO date formats are handled correctly"""
+        # Test with different timezone formats
+        dates_to_test = [
+            "2020-01-01T10:00:00Z",
+            "2020-01-01T10:00:00+00:00",
+            "2020-01-01T10:00:00.000Z",
+            "2020-01-01T10:00:00.123456+00:00",
+        ]
+
+        for date_str in dates_to_test:
+            with freeze_time("2024-01-02"):
+                result = logic.is_snap_old(date_str)
+                self.assertTrue(result, f"Failed for date format: {date_str}")

webapp/store/logic.py

@@ -5,6 +5,7 @@
 
 import humanize
 from dateutil import parser
+from dateutil.relativedelta import relativedelta
 from webapp import helpers
 
 
@@ -203,6 +204,36 @@ def convert_date(date_to_convert):
         return date_parsed.strftime("%-d %B %Y")
 
 
+def is_snap_old(last_updated_date, old_threshold_years=2.0):
+    """Check if a snap is considered 'old' based on its last update date
+
+    A snap is considered old if it hasn't been updated in the specified
+    number of years (default: 2 years).
+
+    :param last_updated_date: The last updated date string in ISO format
+    :param old_threshold_years: Number of years to consider a snap old
+                                (default: 2)
+    :returns: True if snap is old, False otherwise
+    """
+    if not last_updated_date:
+        return False
+
+    try:
+        date_parsed = parser.parse(last_updated_date)
+        if date_parsed.tzinfo is None:
+            date_parsed = date_parsed.replace(tzinfo=datetime.timezone.utc)
+
+        now = datetime.datetime.now(datetime.timezone.utc)
+
+        delta = relativedelta(now, date_parsed)
+        years_since_update = delta.years
+
+        return years_since_update >= old_threshold_years
+    except (ValueError, TypeError):
+        # If we can't parse the date, assume it's not old
+        return False
+
+
 categories_list = [
     "development",
     "games",

webapp/store/snap_details_views.py

@@ -106,6 +106,24 @@ def _get_context_snap_details(snap_name, supported_architectures=None):
             lowest_risk_available,
             supported_architectures,
         )
+
+        # Determine the most recent update date from updates tuple
+        # updates[0] is the stable channel, updates[1] is the most
+        # recent non-stable
+        most_recent_update = None
+        if updates[0] and updates[1]:
+            # Compare both and use the most recent
+            date_0 = updates[0].get("released-at")
+            date_1 = updates[1].get("released-at")
+            if date_0 and date_1:
+                most_recent_update = max(date_0, date_1)
+            else:
+                most_recent_update = date_0 or date_1
+        elif updates[0]:
+            most_recent_update = updates[0].get("released-at")
+        elif updates[1]:
+            most_recent_update = updates[1].get("released-at")
+
         binary_filesize = latest_channel["download"]["size"]
 
         # filter out banner and banner-icon images from screenshots
@@ -191,6 +209,7 @@ def _get_context_snap_details(snap_name, supported_architectures=None):
             "filesize": humanize.naturalsize(binary_filesize),
             "last_updated": logic.convert_date(last_updated),
             "last_updated_raw": last_updated,
+            "old_snap_info": logic.is_snap_old(most_recent_update),
             "is_users_snap": is_users_snap,
             "unlisted": details.get("snap", {}).get("unlisted", False),
             "developer": developer,