Add auth file

src/auth.py

@@ -0,0 +1,50 @@
+import os
+import hmac
+from fastapi import Request
+from fastapi.exceptions import HTTPException
+from fastapi.param_functions import Header
+from dotenv import load_dotenv
+
+load_dotenv()
+
+async def check_ref(request: Request):
+    json = await request.json()  
+    if json["ref"] and json["ref"] == f"refs/heads/{os.environ.get('BRANCH')}":
+        return
+    raise HTTPException(status_code=403, detail="Invalid branch")
+
+async def auth_hook(request: Request):
+    try:
+        json = await request.json()
+        text = await request.body()
+    except:
+        raise HTTPException(status_code=204, detail="Missing or bad content")
+    header_signature = request.headers.get('X-Hub-Signature')
+
+    if not header_signature:
+        raise HTTPException(status_code=400, detail="Missing signature")
+
+    # separate the signature from the sha1 indication
+    sha_name, signature = header_signature.split('=')
+    if sha_name != 'sha1':
+        raise HTTPException(status_code=400, detail="Invalid signature")
+
+    secret_key = os.environ.get('WEBHOOK_SECRET')
+    if secret_key is None:
+        raise HTTPException(status_code=503, detail="Missing WEBHOOK_SECRET")
+
+    # create a new hmac with the secret key and the request data
+    mac = hmac.new(secret_key.encode(), msg=text, digestmod='sha1')
+
+    # verify the digest matches the signature
+    if not hmac.compare_digest(mac.hexdigest(), signature):
+        raise HTTPException(status_code=403, detail="Unauthorized")
+
+async def auth_web(request: Request):
+    token = request._query_params.get("token")
+    if token is None:
+        raise HTTPException(status_code=400, detail="Missing token")
+    print(token, os.environ.get("TOKEN"))
+    if token == os.environ.get("TOKEN"):
+        return
+    raise HTTPException(status_code=403, detail="Invalid token")