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1from fastapi import FastAPI, HTTPException, Header
2from datetime import datetime, timedelta
3import hashlib
4import uuid
5import random
6 
7app = FastAPI()
8 
9users = {}
10tokens = {}
11lessons = {}
12progress = {}
13next_user_id = 1
14next_lesson_id = 1
15next_progress_id = 1
16 
17def get_current_user(authorization: str = Header(None)):
18    if not authorization:
19        raise HTTPException(status_code=401, detail="No auth token")
20    token = authorization.replace("Bearer ", "")
21    if token not in tokens:
22        raise HTTPException(status_code=401, detail="Invalid token")
23    return tokens[token]
24 
25@app.post("/signup")
26def signup(username: str, password: str):
27    global next_user_id
28    user_id = next_user_id
29    next_user_id += 1
30    hashed = hashlib.sha256(password.encode()).hexdigest()
31    users[user_id] = {"id": user_id, "username": username, "password": hashed}
32    return {"id": user_id, "username": username}
33 
34@app.post("/login")
35def login(username: str, password: str):
36    for uid, u in users.items():
37        if u["username"] == username and u["password"] == hashlib.sha256(password.encode()).hexdigest():
38            token = str(uuid.uuid4())
39            tokens[token] = uid
40            return {"token": token}
41    raise HTTPException(status_code=401, detail="Bad credentials")
42 
43@app.get("/lessons/{lesson_id}")
44def get_lesson(lesson_id: int, authorization: str = Header(None)):
45    user_id = get_current_user(authorization)
46    if lesson_id not in lessons:
47        raise HTTPException(status_code=404, detail="Lesson not found")
48    return lessons[lesson_id]
49 
50@app.post("/lessons")
51def create_lesson(title: str, content: str, language: str, difficulty: int, authorization: str = Header(None)):
52    user_id = get_current_user(authorization)
53    global next_lesson_id
54    lesson_id = next_lesson_id
55    next_lesson_id += 1
56    lessons[lesson_id] = {
57        "id": lesson_id,
58        "title": title,
59        "content": content,
60        "language": language,
61        "difficulty": difficulty,
62        "quiz_questions": [],
63        "created_by": user_id
64    }
65    return lessons[lesson_id]
66 
67@app.put("/lessons/{lesson_id}")
68def update_lesson(lesson_id: int, title: str = None, content: str = None, language: str = None, difficulty: int = None, quiz_questions: list = None, authorization: str = Header(None)):
69    user_id = get_current_user(authorization)
70    if lesson_id not in lessons:
71        raise HTTPException(status_code=404, detail="Lesson not found")
72    lesson = lessons[lesson_id]
73    if title is not None:
74        lesson["title"] = title
75    if content is not None:
76        lesson["content"] = content
77    if language is not None:
78        lesson["language"] = language
79    if difficulty is not None:
80        lesson["difficulty"] = difficulty
81    if quiz_questions is not None:
82        lesson["quiz_questions"] = quiz_questions
83    return lesson
84 
85@app.get("/progress/{progress_id}")
86def get_progress(progress_id: int, authorization: str = Header(None)):
87    user_id = get_current_user(authorization)
88    if progress_id not in progress:
89        raise HTTPException(status_code=404, detail="Progress not found")
90    return progress[progress_id]
91 
92@app.post("/progress")
93def create_progress(lesson_id: int, score: float, next_review: str = None, authorization: str = Header(None)):
94    user_id = get_current_user(authorization)
95    global next_progress_id
96    pid = next_progress_id
97    next_progress_id += 1
98    now = datetime.utcnow()
99    if next_review is None:
100        next_review = (now + timedelta(days=1)).isoformat()
101    progress[pid] = {
102        "id": pid,
103        "user_id": user_id,
104        "lesson_id": lesson_id,
105        "score": score,
106        "last_reviewed": now.isoformat(),
107        "next_review": next_review
108    }
109    return progress[pid]

1fastapi
2uvicorn