https://joshdimella.com/blog/adding-api-key-auth-to-fast-api
Step 1: Define a List of Valid API Keys
API_KEYS = [
"9d207bf0-10f5-4d8f-a479-22ff5aeff8d1",
"f47d4a2c-24cf-4745-937e-620a5963c0b8",
"b7061546-75e8-444b-a2c4-f19655d07eb8",
]
Step 2: Implement API Key Security Function
from fastapi import HTTPException, status, Security, FastAPI
from fastapi.security import APIKeyHeader, APIKeyQuery
api_key_query = APIKeyQuery(name="api-key", auto_error=False)
api_key_header = APIKeyHeader(name="x-api-key", auto_error=False)
def get_api_key(
api_key_query: str = Security(api_key_query),
api_key_header: str = Security(api_key_header),
) -> str:
"""Retrieve and validate an API key from the query parameters or HTTP header.
Args:
api_key_query: The API key passed as a query parameter.
api_key_header: The API key passed in the HTTP header.
Returns:
The validated API key.
Raises:
HTTPException: If the API key is invalid or missing.
"""
if api_key_query in API_KEYS:
return api_key_query
if api_key_header in API_KEYS:
return api_key_header
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid or missing API Key",
)
Step 3: Secure the Routes
app = FastAPI()
@app.get("/public")
def public():
"""A public endpoint that does not require any authentication."""
return "Public Endpoint"
@app.get("/private")
def private(api_key: str = Security(get_api_key)):
"""A private endpoint that requires a valid API key to be provided."""
return f"Private Endpoint. API Key: {api_key}"
Complete Example
from fastapi import HTTPException, status, Security, FastAPI
from fastapi.security import APIKeyHeader, APIKeyQuery
API_KEYS = [
"9d207bf0-10f5-4d8f-a479-22ff5aeff8d1",
"f47d4a2c-24cf-4745-937e-620a5963c0b8",
"b7061546-75e8-444b-a2c4-f19655d07eb8",
]
api_key_query = APIKeyQuery(name="api-key", auto_error=False)
api_key_header = APIKeyHeader(name="x-api-key", auto_error=False)
def get_api_key(
api_key_query: str = Security(api_key_query),
api_key_header: str = Security(api_key_header),
) -> str:
"""Retrieve and validate an API key from the query parameters or HTTP header.
Args:
api_key_query: The API key passed as a query parameter.
api_key_header: The API key passed in the HTTP header.
Returns:
The validated API key.
Raises:
HTTPException: If the API key is invalid or missing.
"""
if api_key_query in API_KEYS:
return api_key_query
if api_key_header in API_KEYS:
return api_key_header
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid or missing API Key",
)
app = FastAPI()
@app.get("/public")
def public():
"""A public endpoint that does not require any authentication."""
return "Public Endpoint"
@app.get("/private")
def private(api_key: str = Security(get_api_key)):
"""A private endpoint that requires a valid API key to be provided."""
return f"Private Endpoint. API Key: {api_key}"
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