[feat] support webfinger

app.py

@@ -1,11 +1,25 @@
 #!/usr/bin/env python3
 """Creatr App"""
-from flask import Flask, request
+from flask import Flask, Response, request, Request, abort, jsonify
 from demo.utils.checker import inbox_prechecker
+from demo import config
 
 
 app = Flask(__name__)
 
+def is_ap_requested(request: Request) -> bool:
+    accept_str = request.headers.get("accept")
+    if accept_str is None:
+        return False
+    for i in {
+        "application/activity+json",
+        "application/ld+json",
+    }:
+        if accept_str.startswith(i):
+            return True
+    return False
+
+
 @app.route('/')
 def index():
     """Show index page"""
@@ -19,3 +33,35 @@ def inbox():
     if is_verify:
         return "STUB"
     return "STUB"
+
+
+@app.route("/.well-known/webfinger")
+def wellknown_webfinger() -> Response:
+    """Exposes servers WebFinger data."""
+    resource = request.args.get("resource")
+
+    if resource not in [f"acct:{config.USERNAME}@{config.DOMAIN}", config.ID]:
+        abort(404)
+
+    resp = jsonify(
+        {
+            "subject": f"acct:{config.USERNAME}@{config.DOMAIN}",
+            "aliases": [config.ID],
+            "links": [
+                {
+                    "rel": "http://webfinger.net/rel/profile-page",
+                    "type": "text/html",
+                    "href": config.ID,
+                },
+                {
+                    "rel": "self",
+                    "type": "application/activity+json",
+                    "href": config.ID,
+                },
+            ],
+        },
+    )
+    resp.headers["Access-Control-Allow-Origin"]  = "*"
+    resp.headers["Content-Type"] = "application/jrd+json; charset=utf-8"
+
+    return resp