api: Migrate to Flask Restful

This change updates the API to use Flask Restful instead of our own
in-house REST library. This change reduces the maintenance effort and
allows us to drastically simplify the API implementation needed for the
OpenDC v2 API.

1 files changed, 60 insertions, 0 deletions

diff --git a/opendc-web/opendc-web-api/opendc/exts.py b/opendc-web/opendc-web-api/opendc/exts.py
new file mode 100644
index 00000000..f088a29c
--- /dev/null
+++ b/opendc-web/opendc-web-api/opendc/exts.py
@@ -0,0 +1,60 @@
+import os
+from functools import wraps
+
+from flask import g, _request_ctx_stack
+from werkzeug.local import LocalProxy
+
+from opendc.database import Database
+from opendc.auth import AuthContext, AsymmetricJwtAlgorithm, get_token
+
+
+def get_db():
+    """
+    Return the configured database instance for the application.
+    """
+    _db = getattr(g, 'db', None)
+    if _db is None:
+        _db = Database.from_credentials(user=os.environ['OPENDC_DB_USERNAME'],
+                                        password=os.environ['OPENDC_DB_PASSWORD'],
+                                        database=os.environ['OPENDC_DB'],
+                                        host=os.environ.get('OPENDC_DB_HOST', 'localhost'))
+        g.db = _db
+    return _db
+
+
+db = LocalProxy(get_db)
+
+
+def get_auth_context():
+    """
+    Return the configured auth context for the application.
+    """
+    _auth_context = getattr(g, 'auth_context', None)
+    if _auth_context is None:
+        _auth_context = AuthContext(
+            alg=AsymmetricJwtAlgorithm(jwks_url=f"https://{os.environ['AUTH0_DOMAIN']}/.well-known/jwks.json"),
+            issuer=f"https://{os.environ['AUTH0_DOMAIN']}/",
+            audience=os.environ['AUTH0_AUDIENCE']
+        )
+        g.auth_context = _auth_context
+    return _auth_context
+
+
+auth_context = LocalProxy(get_auth_context)
+
+
+def requires_auth(f):
+    """Decorator to determine if the Access Token is valid.
+    """
+
+    @wraps(f)
+    def decorated(*args, **kwargs):
+        token = get_token()
+        payload = auth_context.validate(token)
+        _request_ctx_stack.top.current_user = payload
+        return f(*args, **kwargs)
+
+    return decorated
+
+
+current_user = LocalProxy(lambda: getattr(_request_ctx_stack.top, 'current_user', None))