Add authentication, public profile, and infinite scroll

- Implement session-based auth with argon2 password hashing
- Add login form and logout button in nav
- Create public /tyler profile page with curated stats
- Implement infinite scroll for film lists (load 20 at a time)
- Add lazy loading for poster images
- Fix profile page CSS to use dark theme variables
- Use consistent star character (✦) across all pages
- Add /films/partial endpoint for pagination

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/routers/auth.py b/routers/auth.py
new file mode 100644
index 0000000..d3fb963
--- /dev/null
+++ b/routers/auth.py
@@ -0,0 +1,58 @@
+import os
+from fastapi import APIRouter, Request
+from fastapi.responses import RedirectResponse
+from fastapi.templating import Jinja2Templates
+from argon2 import PasswordHasher
+from argon2.exceptions import VerifyMismatchError
+
+templates = Jinja2Templates(directory="templates")
+
+router = APIRouter()
+
+OWNER_PASSWORD_HASH = os.getenv("OWNER_PASSWORD_HASH", "")
+ph = PasswordHasher()
+
+
+@router.get("/login")
+async def login_form(request: Request):
+    if request.session.get("authenticated"):
+        return RedirectResponse("/", status_code=303)
+    return templates.TemplateResponse(request=request, name="login.html", context={"request": request})
+
+
+@router.post("/login")
+async def login(request: Request):
+    if request.session.get("authenticated"):
+        return RedirectResponse("/", status_code=303)
+
+    form = await request.form()
+    password = form.get("password", "")
+
+    if not OWNER_PASSWORD_HASH:
+        error = "Server not configured: OWNER_PASSWORD_HASH not set"
+        return templates.TemplateResponse(
+            request=request,
+            name="login.html",
+            context={"request": request, "error": error},
+            status_code=500
+        )
+
+    try:
+        ph.verify(OWNER_PASSWORD_HASH, password)
+        request.session["authenticated"] = True
+        return RedirectResponse("/", status_code=303)
+    except VerifyMismatchError:
+        pass
+
+    return templates.TemplateResponse(
+        request=request,
+        name="login.html",
+        context={"request": request, "error": "Invalid password"},
+        status_code=401
+    )
+
+
+@router.post("/logout")
+async def logout(request: Request):
+    request.session.clear()
+    return RedirectResponse("/login", status_code=303)