[Enhance] API for purchases, items, operations

- Add API endpoints for purchases, items, and operations
- Header checker? :)

latest version/api/system.py

@@ -0,0 +1,32 @@
+from flask import Blueprint, request
+
+from core.error import ArcError
+from core.operation import BaseOperation
+
+from .api_auth import api_try, role_required
+from .api_code import success_return
+
+bp = Blueprint('system', __name__, url_prefix='/system')
+
+
+operation_dict = {i._name: i for i in BaseOperation.__subclasses__()}
+
+
+@bp.route('/operations', methods=['GET'])
+@role_required(request, ['system'])
+@api_try
+def operations_get(user):
+    return success_return(list(operation_dict.keys()))
+
+
+@bp.route('/operations/<string:operation_name>', methods=['POST'])
+@role_required(request, ['system'])
+@api_try
+def operations_operation_post(user, operation_name: str):
+    if operation_name not in operation_dict:
+        raise ArcError(
+            f'No such operation: `{operation_name}`', api_error_code=-1, status=404)
+    x = operation_dict[operation_name]()
+    x.set_params(**request.get_json())
+    x.run()
+    return success_return()