[IMP]fastapi: enable multi-slash routes

Author: PicchiSeba

fastapi/demo/fastapi_endpoint_demo.xml

@@ -44,4 +44,15 @@ methods. See documentation to learn more about how to create a new app.
     <field name="demo_auth_method">http_basic</field>
       <field name="user_id" ref="my_demo_app_user" />
   </record>
+
+  <record id="fastapi_endpoint_multislash_demo" model="fastapi.endpoint">
+    <field name="name">Fastapi Multi-Slash Demo Endpoint</field>
+    <field name="description">
+        Like the other demo endpoint but with multi-slash
+    </field>
+    <field name="app">demo</field>
+    <field name="root_path">/fastapi/demo</field>
+    <field name="demo_auth_method">http_basic</field>
+    <field name="user_id" ref="my_demo_app_user" />
+  </record>
 </odoo>

fastapi/models/fastapi_endpoint.py

@@ -213,8 +213,17 @@ def _reset_app_cache_marker(self):
     @api.model
     @tools.ormcache("path")
     def get_endpoint(self, path):
-        root_path = "/" + path.split("/")[1]
-        endpoint = self.search([("root_path", "=", root_path)])[:1] or False
+        # try to match the request url with the most similar endpoint
+        endpoints_by_length = self.search([]).sorted(
+            lambda fe: len(fe.root_path), reverse=True
+        )
+        endpoint = False
+        while endpoints_by_length:
+            candidate_endpoint = endpoints_by_length[0]
+            if path.startswith(candidate_endpoint.root_path):
+                endpoint = candidate_endpoint
+                break
+            endpoints_by_length -= candidate_endpoint
         return endpoint
 
     @api.model