Create mas-oidc-client crate

Methods to interact as an RP with an OIDC OP.

crates/oidc-client/src/utils/mod.rs

@@ -0,0 +1,41 @@
+// Copyright 2022 Kévin Commaille.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::ops::RangeBounds;
+
+use bytes::Buf;
+use http::{Response, StatusCode};
+
+use crate::error::ErrorBody;
+
+pub fn http_error_mapper<T>(response: Response<T>) -> Option<ErrorBody>
+where
+    T: Buf,
+{
+    let body = response.into_body();
+    serde_json::from_reader(body.reader()).ok()
+}
+
+pub fn http_all_error_status_codes() -> impl RangeBounds<StatusCode> {
+    let client_errors_start_code = match StatusCode::from_u16(400) {
+        Ok(code) => code,
+        Err(_) => unreachable!(),
+    };
+    let server_errors_end_code = match StatusCode::from_u16(599) {
+        Ok(code) => code,
+        Err(_) => unreachable!(),
+    };
+
+    client_errors_start_code..=server_errors_end_code
+}