1 files changed, 65 insertions, 0 deletions
diff --git a/web-server/opendc/util/exceptions.py b/web-server/opendc/util/exceptions.py
new file mode 100644
index 00000000..2563c419
--- /dev/null
+++ b/web-server/opendc/util/exceptions.py
@@ -0,0 +1,65 @@
+class RequestInitializationError(Exception):
+    """Raised when a Request cannot successfully be initialized"""
+
+
+class UnimplementedEndpointError(RequestInitializationError):
+    """Raised when a Request path does not point to a module."""
+
+
+class MissingRequestParameterError(RequestInitializationError):
+    """Raised when a Request does not contain one or more required parameters."""
+
+
+class UnsupportedMethodError(RequestInitializationError):
+    """Raised when a Request does not use a supported REST method.
+    
+    The method must be in all-caps, supported by REST, and implemented by the module.
+    """
+
+
+class AuthorizationTokenError(RequestInitializationError):
+    """Raised when an authorization token is not correctly verified."""
+
+
+class ForeignKeyError(Exception):
+    """Raised when a foreign key constraint is not met."""
+
+
+class RowNotFoundError(Exception):
+    """Raised when a database row is not found."""
+    def __init__(self, table_name):
+        super(RowNotFoundError, self).__init__('Row in `{}` table not found.'.format(table_name))
+
+        self.table_name = table_name
+
+
+class ParameterError(Exception):
+    """Raised when a parameter is either missing or incorrectly typed."""
+
+
+class IncorrectParameterError(ParameterError):
+    """Raised when a parameter is of the wrong type."""
+    def __init__(self, parameter_name, parameter_location):
+        super(IncorrectParameterError,
+              self).__init__('Incorrectly typed `{}` {} parameter.'.format(parameter_name, parameter_location))
+
+        self.parameter_name = parameter_name
+        self.parameter_location = parameter_location
+
+
+class MissingParameterError(ParameterError):
+    """Raised when a parameter is missing."""
+    def __init__(self, parameter_name, parameter_location):
+        super(MissingParameterError,
+              self).__init__('Missing required `{}` {} parameter.'.format(parameter_name, parameter_location))
+
+        self.parameter_name = parameter_name
+        self.parameter_location = parameter_location
+
+
+class ClientError(Exception):
+    """Raised when a 4xx response is to be returned."""
+
+    def __init__(self, response):
+        super(ClientError, self).__init__(str(response))
+        self.response = response