Add limits package, RateLimiter dependency, test_depends, begin /api/login route

backend/linkpulse/dependencies.py

@@ -0,0 +1,35 @@
+import structlog
+from fastapi import HTTPException, Request, Response, status
+from limits.strategies import MovingWindowRateLimiter
+from limits.storage import MemoryStorage
+from limits import parse
+
+storage = MemoryStorage()
+strategy = MovingWindowRateLimiter(storage)
+
+logger = structlog.get_logger()
+
+
+class RateLimiter:
+    def __init__(self, limit: str):
+        self.limit = parse(limit)
+        self.retry_after = str(self.limit.get_expiry())
+
+    async def __call__(self, request: Request, response: Response):
+        logger.debug("Rate limiting request", path=request.url.path)
+
+        key = request.headers.get("X-Real-IP")
+        if key is None:
+            if request.client is None:
+                logger.warning("No client information available for request.")
+                return False
+            key = request.client.host
+
+        if not strategy.hit(self.limit, key):
+            logger.warning("Rate limit exceeded", key=key)
+            raise HTTPException(
+                status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+                detail="Too Many Requests",
+                headers={"Retry-After": self.retry_after},
+            )
+        return True

backend/linkpulse/routers/auth.py

@@ -1,10 +1,17 @@
 from typing import Tuple, Optional
 
-from fastapi import APIRouter
+from pwdlib import PasswordHash
+from pwdlib.hashers.argon2 import Argon2Hasher
+from fastapi import APIRouter, Depends
+from pydantic import BaseModel, EmailStr, Field
+from linkpulse.dependencies import RateLimiter
 from linkpulse.models import User, Session
 
 router = APIRouter()
 
+hasher = PasswordHash([Argon2Hasher()])
+dummy_hash = "$argon2id$v=19$m=65536,t=3,p=4$Ii3hm5/NqcJddQDFK24Wtw$I99xV/qkaLROo0VZcvaZrYMAD9RTcWzxY5/RbMoRLQ4"
+
 
 def validate_session(
     token: str, user: bool = True
@@ -39,10 +46,28 @@ def validate_session(
     return True, True, session.user
 
 
-@router.post("/api/login")
+class LoginBody(BaseModel):
-async def login():
+    email: EmailStr
-    # Validate parameters
+    password: str = Field(min_length=1)
-    # Hash regardless of user existence to prevent timing attacks
+    remember_me: bool = False
+
+
+class LoginError(BaseModel):
+    error: str
+
+
+@router.post("/api/login", dependencies=[Depends(RateLimiter("6/minute"))])
+async def login(body: LoginBody):
+    # Acquire user by email
+    user = User.get_or_none(User.email == body.email)
+
+    if user is None:
+        # Hash regardless of user existence to prevent timing attacks
+        hasher.verify(body.password, dummy_hash)
+        return LoginError(error="Invalid email or password")
+
+    # valid, updated_hash = hasher.verify_and_update(body.password, existing_hash)
+
     # Check if user exists, return 401 if not
     # Check if password matches, return 401 if not
     # Create session

backend/linkpulse/tests/test_depends.py

@@ -0,0 +1,21 @@
+import structlog
+from fastapi import status
+from fastapi.testclient import TestClient
+from linkpulse.app import app
+
+logger = structlog.get_logger()
+
+
+def test_rate_limit():
+    args = {"email": "test@test.com", "password": "test"}
+
+    with TestClient(app) as client:
+        for _ in range(6):
+            response = client.post("/api/login", json=args)
+            assert response.status_code == status.HTTP_200_OK
+
+        # 7th request should be rate limited
+        response = client.post("/api/login", json=args)
+        assert response.status_code == status.HTTP_429_TOO_MANY_REQUESTS
+        assert "Retry-After" in response.headers
+        assert int(response.headers["Retry-After"]) > 1

backend/poetry.lock

@@ -549,6 +549,23 @@ files = [
     {file = "cwcwidth-0.1.9.tar.gz", hash = "sha256:f19d11a0148d4a8cacd064c96e93bca8ce3415a186ae8204038f45e108db76b8"},
 ]
 
+[[package]]
+name = "deprecated"
+version = "1.2.14"
+description = "Python @deprecated decorator to deprecate old python classes, functions or methods."
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+files = [
+    {file = "Deprecated-1.2.14-py2.py3-none-any.whl", hash = "sha256:6fac8b097794a90302bdbb17b9b815e732d3c4720583ff1b198499d78470466c"},
+    {file = "Deprecated-1.2.14.tar.gz", hash = "sha256:e5323eb936458dccc2582dc6f9c322c852a775a27065ff2b0c4970b9d53d01b3"},
+]
+
+[package.dependencies]
+wrapt = ">=1.10,<2"
+
+[package.extras]
+dev = ["PyTest", "PyTest-Cov", "bump2version (<1)", "sphinx (<2)", "tox"]
+
 [[package]]
 name = "dnspython"
 version = "2.7.0"
@@ -868,6 +885,25 @@ files = [
 [package.extras]
 all = ["flake8 (>=7.1.1)", "mypy (>=1.11.2)", "pytest (>=8.3.2)", "ruff (>=0.6.2)"]
 
+[[package]]
+name = "importlib-resources"
+version = "6.4.5"
+description = "Read resources from Python packages"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "importlib_resources-6.4.5-py3-none-any.whl", hash = "sha256:ac29d5f956f01d5e4bb63102a5a19957f1b9175e45649977264a1416783bb717"},
+    {file = "importlib_resources-6.4.5.tar.gz", hash = "sha256:980862a1d16c9e147a59603677fa2aa5fd82b87f223b6cb870695bcfce830065"},
+]
+
+[package.extras]
+check = ["pytest-checkdocs (>=2.4)", "pytest-ruff (>=0.2.1)"]
+cover = ["pytest-cov"]
+doc = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
+enabler = ["pytest-enabler (>=2.2)"]
+test = ["jaraco.test (>=5.4)", "pytest (>=6,!=8.1.*)", "zipp (>=3.17)"]
+type = ["pytest-mypy"]
+
 [[package]]
 name = "iniconfig"
 version = "2.0.0"
@@ -893,6 +929,35 @@ files = [
 [package.dependencies]
 ansicon = {version = "*", markers = "platform_system == \"Windows\""}
 
+[[package]]
+name = "limits"
+version = "3.13.0"
+description = "Rate limiting utilities"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "limits-3.13.0-py3-none-any.whl", hash = "sha256:9767f7233da4255e9904b79908a728e8ec0984c0b086058b4cbbd309aea553f6"},
+    {file = "limits-3.13.0.tar.gz", hash = "sha256:6571b0c567bfa175a35fed9f8a954c0c92f1c3200804282f1b8f1de4ad98a953"},
+]
+
+[package.dependencies]
+deprecated = ">=1.2"
+importlib-resources = ">=1.3"
+packaging = ">=21,<25"
+typing-extensions = "*"
+
+[package.extras]
+all = ["aetcd", "coredis (>=3.4.0,<5)", "emcache (>=0.6.1)", "emcache (>=1)", "etcd3", "motor (>=3,<4)", "pymemcache (>3,<5.0.0)", "pymongo (>4.1,<5)", "redis (>3,!=4.5.2,!=4.5.3,<6.0.0)", "redis (>=4.2.0,!=4.5.2,!=4.5.3)"]
+async-etcd = ["aetcd"]
+async-memcached = ["emcache (>=0.6.1)", "emcache (>=1)"]
+async-mongodb = ["motor (>=3,<4)"]
+async-redis = ["coredis (>=3.4.0,<5)"]
+etcd = ["etcd3"]
+memcached = ["pymemcache (>3,<5.0.0)"]
+mongodb = ["pymongo (>4.1,<5)"]
+redis = ["redis (>3,!=4.5.2,!=4.5.3,<6.0.0)"]
+rediscluster = ["redis (>=4.2.0,!=4.5.2,!=4.5.3)"]
+
 [[package]]
 name = "memory-profiler"
 version = "0.61.0"
@@ -1679,6 +1744,85 @@ files = [
     {file = "wcwidth-0.2.13.tar.gz", hash = "sha256:72ea0c06399eb286d978fdedb6923a9eb47e1c486ce63e9b4e64fc18303972b5"},
 ]
 
+[[package]]
+name = "wrapt"
+version = "1.16.0"
+description = "Module for decorators, wrappers and monkey patching."
+optional = false
+python-versions = ">=3.6"
+files = [
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+    {file = "wrapt-1.16.0.tar.gz", hash = "sha256:5f370f952971e7d17c7d1ead40e49f32345a7f7a5373571ef44d800d06b1899d"},
+]
+
 [[package]]
 name = "wsproto"
 version = "1.2.0"
@@ -1696,4 +1840,4 @@ h11 = ">=0.9.0,<1"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "cb3c6f5fdc7f362a6fd46c1f719e68280705ef23956ebc020475d985a844247f"
+content-hash = "9dff2a47bb95e65f15616bb82926eb81d418456c5ec60db46dfe06056c643e31"

backend/pyproject.toml

@@ -31,6 +31,7 @@ hypercorn = "^0.17.3"
 pwdlib = {extras = ["argon2"], version = "^0.2.1"}
 pytest-xdist = "^3.6.1"
 email-validator = "^2.2.0"
+limits = "^3.13.0"
 
 
 [tool.poetry.group.dev.dependencies]