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1from fastapi import FastAPI, HTTPException, Header
2from typing import Optional
3import secrets
4import datetime
5 
6app = FastAPI()
7 
8users = {}
9tokens = {}
10groups = {}
11posts = {}
12meetings = {}
13next_user_id = 1
14next_group_id = 1
15next_post_id = 1
16next_meeting_id = 1
17 
18def get_current_user(authorization: Optional[str] = Header(None)):
19    if not authorization:
20        raise HTTPException(status_code=401, detail="Missing auth token")
21    token = authorization.replace("Bearer ", "")
22    if token not in tokens:
23        raise HTTPException(status_code=401, detail="Invalid token")
24    return tokens[token]
25 
26@app.post("/signup")
27def signup(username: str, password: str):
28    global next_user_id
29    for u in users.values():
30        if u["username"] == username:
31            raise HTTPException(status_code=400, detail="Username taken")
32    user_id = next_user_id
33    next_user_id += 1
34    users[user_id] = {"id": user_id, "username": username, "password": password}
35    return {"id": user_id, "username": username}
36 
37@app.post("/login")
38def login(username: str, password: str):
39    for u in users.values():
40        if u["username"] == username and u["password"] == password:
41            token = secrets.token_hex(16)
42            tokens[token] = u["id"]
43            return {"token": token}
44    raise HTTPException(status_code=401, detail="Invalid credentials")
45 
46@app.post("/groups")
47def create_group(name: str, description: str = "", authorization: Optional[str] = Header(None)):
48    global next_group_id
49    user_id = get_current_user(authorization)
50    group_id = next_group_id
51    next_group_id += 1
52    groups[group_id] = {
53        "id": group_id,
54        "name": name,
55        "description": description,
56        "host_id": user_id,
57        "members": [user_id],
58        "facilitators": [],
59        "created_at": datetime.datetime.now().isoformat()
60    }
61    return groups[group_id]
62 
63@app.get("/groups/{group_id}")
64def get_group(group_id: int):
65    if group_id not in groups:
66        raise HTTPException(status_code=404, detail="Group not found")
67    return groups[group_id]
68 
69@app.post("/groups/{group_id}/join")
70def join_group(group_id: int, authorization: Optional[str] = Header(None)):
71    user_id = get_current_user(authorization)
72    if group_id not in groups:
73        raise HTTPException(status_code=404, detail="Group not found")
74    if user_id in groups[group_id]["members"]:
75        raise HTTPException(status_code=400, detail="Already a member")
76    groups[group_id]["members"].append(user_id)
77    return {"message": "Joined group"}
78 
79@app.post("/promote")
80def promote_member(group_id: int, member_id: int, authorization: Optional[str] = Header(None)):
81    user_id = get_current_user(authorization)
82    if group_id not in groups:
83        raise HTTPException(status_code=404, detail="Group not found")
84    group = groups[group_id]
85    if group["host_id"] != user_id:
86        raise HTTPException(status_code=403, detail="Only host can promote")
87    if member_id not in group["members"]:
88        raise HTTPException(status_code=400, detail="User not a member")
89    if member_id in group["facilitators"]:
90        raise HTTPException(status_code=400, detail="Already a facilitator")
91    group["facilitators"].append(member_id)
92    return {"message": "Promoted to facilitator"}
93 
94@app.post("/groups/{group_id}/posts")
95def create_post(group_id: int, title: str, content: str, authorization: Optional[str] = Header(None)):
96    global next_post_id
97    user_id = get_current_user(authorization)
98    if group_id not in groups:
99        raise HTTPException(status_code=404, detail="Group not found")
100    if user_id not in groups[group_id]["members"]:
101        raise HTTPException(status_code=403, detail="Not a member")
102    post_id = next_post_id
103    next_post_id += 1
104    posts[post_id] = {
105        "id": post_id,
106        "group_id": group_id,
107        "author_id": user_id,
108        "title": title,
109        "content": content,
110        "created_at": datetime.datetime.now().isoformat()
111    }
112    return posts[post_id]
113 
114@app.get("/posts/{post_id}")
115def get_post(post_id: int):
116    if post_id not in posts:
117        raise HTTPException(status_code=404, detail="Post not found")
118    return posts[post_id]
119 
120@app.post("/groups/{group_id}/meetings")
121def schedule_meeting(group_id: int, title: str, scheduled_at: str, authorization: Optional[str] = Header(None)):
122    global next_meeting_id
123    user_id = get_current_user(authorization)
124    if group_id not in groups:
125        raise HTTPException(status_code=404, detail="Group not found")
126    group = groups[group_id]
127    if user_id != group["host_id"] and user_id not in group["facilitators"]:
128        raise HTTPException(status_code=403, detail="Only host or facilitator can schedule meetings")
129    meeting_id = next_meeting_id
130    next_meeting_id += 1
131    meetings[meeting_id] = {
132        "id": meeting_id,
133        "group_id": group_id,
134        "title": title,
135        "scheduled_at": scheduled_at,
136        "created_by": user_id,
137        "created_at": datetime.datetime.now().isoformat()
138    }
139    return meetings[meeting_id]
140 
141@app.get("/meetings/{meeting_id}")
142def get_meeting(meeting_id: int):
143    if meeting_id not in meetings:
144        raise HTTPException(status_code=404, detail="Meeting not found")
145    return meetings[meeting_id]
146 
147@app.post("/groups/{group_id}/posts/{post_id}/delete")
148def delete_post(group_id: int, post_id: int, authorization: Optional[str] = Header(None)):
149    user_id = get_current_user(authorization)
150    if group_id not in groups:
151        raise HTTPException(status_code=404, detail="Group not found")
152    if post_id not in posts:
153        raise HTTPException(status_code=404, detail="Post not found")
154    post = posts[post_id]
155    group = groups[group_id]
156    if post["author_id"] != user_id and user_id != group["host_id"] and user_id not in group["facilitators"]:
157        raise HTTPException(status_code=403, detail="Not authorized to delete this post")
158    del posts[post_id]
159    return {"message": "Post deleted"}

1fastapi
2uvicorn