Add 'fiscal/' from commit '102ba84500dbd9655a0471288c3e278652593ca9'

git-subtree-dir: fiscal
git-subtree-mainline: d95165fc8f
git-subtree-split: 102ba84500

fiscal/central/app/auth.py

@@ -0,0 +1,17 @@
+"""Bearer authentication storing only SHA-256 token digests."""
+import hashlib, hmac
+from sqlalchemy import select
+from .models import Agent, Tenant
+
+def token_hash(token): return hashlib.sha256(token.encode()).hexdigest()
+def bootstrap(session, token):
+    digest = token_hash(token); agent = session.scalar(select(Agent).where(Agent.token_hash == digest))
+    if agent: return agent
+    tenant = session.scalar(select(Tenant).where(Tenant.name == "development")) or Tenant(name="development")
+    session.add(tenant); session.flush(); agent = Agent(tenant_id=tenant.id, name="development-agent", token_hash=digest); session.add(agent); session.commit(); return agent
+def authenticate(session, token):
+    digest = token_hash(token)
+    for agent in session.scalars(select(Agent)).all():
+        if hmac.compare_digest(agent.token_hash, digest):
+            return agent if agent.enabled else None  # a disabled (revoked) Agent must not authenticate
+    return None