diff --git a/rust/src/errors.rs b/rust/src/errors.rs
new file mode 100644
index 0000000000..4e580e3e8c
--- /dev/null
+++ b/rust/src/errors.rs
@@ -0,0 +1,60 @@
+/*
+ * This file is licensed under the Affero General Public License (AGPL) version 3.
+ *
+ * Copyright (C) 2024 New Vector, Ltd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * See the GNU Affero General Public License for more details:
+ * <https://www.gnu.org/licenses/agpl-3.0.html>.
+ */
+
+#![allow(clippy::new_ret_no_self)]
+
+use std::collections::HashMap;
+
+use http::{HeaderMap, StatusCode};
+use pyo3::{exceptions::PyValueError, import_exception};
+
+import_exception!(synapse.api.errors, SynapseError);
+
+impl SynapseError {
+ pub fn new(
+ code: StatusCode,
+ message: String,
+ errcode: &'static str,
+ additional_fields: Option<HashMap<String, String>>,
+ headers: Option<HeaderMap>,
+ ) -> pyo3::PyErr {
+ // Transform the HeaderMap into a HashMap<String, String>
+ let headers = if let Some(headers) = headers {
+ let mut map = HashMap::with_capacity(headers.len());
+ for (key, value) in headers.iter() {
+ let Ok(value) = value.to_str() else {
+ // This should never happen, but we don't want to panic in case it does
+ return PyValueError::new_err(
+ "Could not construct SynapseError: header value is not valid ASCII",
+ );
+ };
+
+ map.insert(key.as_str().to_owned(), value.to_owned());
+ }
+ Some(map)
+ } else {
+ None
+ };
+
+ SynapseError::new_err((code.as_u16(), message, errcode, additional_fields, headers))
+ }
+}
+
+import_exception!(synapse.api.errors, NotFoundError);
+
+impl NotFoundError {
+ pub fn new() -> pyo3::PyErr {
+ NotFoundError::new_err(())
+ }
+}
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