📝 Add first tutorial src files

docs/tutorial/src/tutorial58-03.py

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+from typing import List, Set
+
+from fastapi import Body, FastAPI, Path, Query, Depends, Cookie
+from pydantic import BaseModel
+from pydantic.types import UrlStr
+from starlette.status import HTTP_201_CREATED
+from starlette.responses import HTMLResponse
+from random import choice
+
+app = FastAPI()
+
+
+class InterestsTracker(BaseModel):
+    track_code: str
+    interests: List[str]
+
+
+fake_tracked_users_db = {
+    "Foo": {"track_code": "Foo", "interests": ["sports", "movies"]},
+    "Bar": {"track_code": "Bar", "interests": ["food", "shows"]},
+    "Baz": {"track_code": "Baz", "interests": ["gaming", "virtual reality"]},
+}
+
+async def get_tracked_interests(track_code: str = Cookie(None)):
+    if track_code in fake_tracked_users_db:
+        track_dict = fake_tracked_users_db[track_code]
+        track = InterestsTracker(**track_dict)
+        return track
+    return None
+
+class ComplexTracker:
+    def __init__(self, tracker: InterestsTracker = Depends(get_tracked_interests)):
+        self.tracker = tracker
+    
+    def random_interest(self):
+        """
+        Get a random interest from the tracked ones for the current user.
+        If the user doesn't have tracked interests, return a random one from the ones available.
+        """
+        if self.tracker.interests:
+            return choice(self.tracker.interests)
+        return choice(["sports", "movies", "food", "shows", "gaming", "virtual reality"])
+
+
+@app.get("/suggested-category")
+async def read_suggested_category(tracker: ComplexTracker = Depends(None)):
+    response = {"category": tracker.random_interest()}
+    return response