feat: set preconnect link for tilelayer

umap/templates/umap/map_detail.html

@@ -7,6 +7,11 @@
   map_detail
 {% endblock body_class %}
 {% block extra_head %}
+  {% if preconnect_domains %}
+    {% for domain in preconnect_domains %}
+      <link rel="preconnect" href="{{ domain }}" />
+    {% endfor %}
+  {% endif %}
   {% umap_css %}
   {% umap_js locale=locale %}
   {% if object.share_status != object.PUBLIC %}<meta name="robots" content="noindex">{% endif %}

umap/tests/base.py

@@ -81,7 +81,7 @@ class MapFactory(factory.django.DjangoModelFactory):
                     "attribution": "\xa9 OSM Contributors",
                     "maxZoom": 18,
                     "minZoom": 0,
-                    "url_template": "https://{s}.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png",
+                    "url_template": "https://a.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png",
                 },
                 "tilelayersControl": True,
                 "zoom": 7,

umap/tests/integration/test_export_map.py

@@ -61,7 +61,7 @@ def test_umap_export(map, live_server, datalayer, page):
                 "attribution": "© OSM Contributors",
                 "maxZoom": 18,
                 "minZoom": 0,
-                "url_template": "https://{s}.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png",
+                "url_template": "https://a.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png",
             },
             "tilelayersControl": True,
             "zoom": 7,

umap/tests/integration/test_map.py

@@ -12,6 +12,35 @@
 pytestmark = pytest.mark.django_db
 
 
+def test_preconnect_for_tilelayer(map, page, live_server, tilelayer):
+    page.goto(f"{live_server.url}{map.get_absolute_url()}")
+    meta = page.locator('link[rel="preconnect"]')
+    expect(meta).to_have_count(1)
+    expect(meta).to_have_attribute("href", "//a.tile.openstreetmap.fr")
+    # Add custom tilelayer
+    map.settings["properties"]["tilelayer"] = {
+        "name": "OSM Piano FR",
+        "maxZoom": 20,
+        "minZoom": 0,
+        "attribution": "test",
+        "url_template": "https://a.piano.tiles.quaidorsay.fr/fr{r}/{z}/{x}/{y}.png",
+    }
+    map.save()
+    page.goto(f"{live_server.url}{map.get_absolute_url()}")
+    expect(meta).to_have_attribute("href", "//a.piano.tiles.quaidorsay.fr")
+    # Add custom tilelayer with variable in domain, should create a preconnect
+    map.settings["properties"]["tilelayer"] = {
+        "name": "OSM Piano FR",
+        "maxZoom": 20,
+        "minZoom": 0,
+        "attribution": "test",
+        "url_template": "https://{s}.piano.tiles.quaidorsay.fr/fr{r}/{z}/{x}/{y}.png",
+    }
+    map.save()
+    page.goto(f"{live_server.url}{map.get_absolute_url()}")
+    expect(meta).to_have_count(0)
+
+
 def test_default_view_latest_without_datalayer_should_use_default_center(
     map, live_server, datalayer, page
 ):

umap/tests/test_map_views.py

@@ -19,7 +19,7 @@ def post_data():
     return {
         "name": "name",
         "center": '{"type":"Point","coordinates":[13.447265624999998,48.94415123418794]}',  # noqa
-        "settings": '{"type":"Feature","geometry":{"type":"Point","coordinates":[5.0592041015625,52.05924589011585]},"properties":{"tilelayer":{"maxZoom":20,"url_template":"http://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png","minZoom":0,"attribution":"HOT and friends"},"licence":"","description":"","name":"test enrhûmé","tilelayersControl":true,"displayDataBrowserOnLoad":false,"displayPopupFooter":true,"displayCaptionOnLoad":false,"miniMap":true,"moreControl":true,"scaleControl":true,"zoomControl":true,"datalayersControl":true,"zoom":8}}',  # noqa
+        "settings": '{"type":"Feature","geometry":{"type":"Point","coordinates":[5.0592041015625,52.05924589011585]},"properties":{"tilelayer":{"maxZoom":20,"url_template":"http://a.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png","minZoom":0,"attribution":"HOT and friends"},"licence":"","description":"","name":"test enrhûmé","tilelayersControl":true,"displayDataBrowserOnLoad":false,"displayPopupFooter":true,"displayCaptionOnLoad":false,"miniMap":true,"moreControl":true,"scaleControl":true,"zoomControl":true,"datalayersControl":true,"zoom":8}}',  # noqa
     }
 
 
@@ -624,7 +624,7 @@ def test_download(client, map, datalayer):
             "attribution": "© OSM Contributors",
             "maxZoom": 18,
             "minZoom": 0,
-            "url_template": "https://{s}.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png",
+            "url_template": "https://a.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png",
         },
         "tilelayersControl": True,
         "zoom": 7,

umap/views.py

@@ -421,6 +421,21 @@ class MapDetailMixin:
     model = Map
     pk_url_kwarg = "map_id"
 
+    def set_preconnect(self, properties, context):
+        # Try to extract the tilelayer domain, in order to but a preconnect meta.
+        url_template = properties.get("tilelayer", {}).get("url_template")
+        # Not explicit tilelayer set, take the first of the list, which will be
+        # used by frontend too.
+        if not url_template:
+            tilelayers = properties.get("tilelayers")
+            if tilelayers:
+                url_template = tilelayers[0].get("url_template")
+        if url_template:
+            domain = urlparse(url_template).netloc
+            # Do not try to preconnect on domains with variables
+            if domain and "{" not in domain:
+                context["preconnect_domains"] = [f"//{domain}"]
+
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
         user = self.request.user
@@ -473,6 +488,7 @@ def get_context_data(self, **kwargs):
         map_settings["properties"].update(properties)
         map_settings["properties"]["datalayers"] = self.get_datalayers()
         context["map_settings"] = json.dumps(map_settings, indent=settings.DEBUG)
+        self.set_preconnect(map_settings["properties"], context)
         return context
 
     def get_datalayers(self):