Lookup nodeinfo url with /.well-known/nodeinfo (#367)

Fixes #364

users/admin.py

@@ -1,3 +1,4 @@
+from asgiref.sync import async_to_sync
 from django.contrib import admin
 from django.db import models
 from django.utils import formats
@@ -30,7 +31,12 @@ class DomainAdmin(admin.ModelAdmin):
     ]
     list_filter = ("local", "blocked")
     search_fields = ("domain", "service_domain")
-    actions = ["force_outdated", "force_updated", "force_connection_issue"]
+    actions = [
+        "force_outdated",
+        "force_updated",
+        "force_connection_issue",
+        "fetch_nodeinfo",
+    ]
 
     @admin.action(description="Force State: outdated")
     def force_outdated(self, request, queryset):
@@ -47,6 +53,14 @@ class DomainAdmin(admin.ModelAdmin):
         for instance in queryset:
             instance.transition_perform("connection_issue")
 
+    @admin.action(description="Fetch nodeinfo")
+    def fetch_nodeinfo(self, request, queryset):
+        for instance in queryset:
+            info = async_to_sync(instance.fetch_nodeinfo)()
+            if info:
+                instance.nodeinfo = info.dict()
+                instance.save()
+
     @admin.display(description="Software")
     def software(self, instance):
         if instance.nodeinfo:

users/models/domain.py

@@ -150,13 +150,35 @@ class Domain(StatorModel):
         """
         Fetch the /NodeInfo/2.0 for the domain
         """
+        nodeinfo20_url = f"https://{self.domain}/nodeinfo/2.0"
+
         async with httpx.AsyncClient(
             timeout=settings.SETUP.REMOTE_TIMEOUT,
             headers={"User-Agent": settings.TAKAHE_USER_AGENT},
         ) as client:
             try:
                 response = await client.get(
-                    f"https://{self.domain}/nodeinfo/2.0",
+                    f"https://{self.domain}/.well-known/nodeinfo",
+                    follow_redirects=True,
+                    headers={"Accept": "application/json"},
+                )
+            except httpx.HTTPError:
+                pass
+            else:
+                try:
+                    for link in response.json().get("links", []):
+                        if (
+                            link.get("rel")
+                            == "http://nodeinfo.diaspora.software/ns/schema/2.0"
+                        ):
+                            nodeinfo20_url = link.get("href", nodeinfo20_url)
+                            break
+                except json.JSONDecodeError:
+                    pass
+
+            try:
+                response = await client.get(
+                    nodeinfo20_url,
                     follow_redirects=True,
                     headers={"Accept": "application/json"},
                 )