Refactor code to prepare support of implicit flow

src/controllers/openid_controller.rs

@@ -16,7 +16,7 @@ use crate::constants::*;
 use crate::controllers::base_controller::{build_fatal_error_page, redirect_user};
 use crate::data::action_logger::{Action, ActionLogger};
 use crate::data::app_config::AppConfig;
-use crate::data::client::{ClientID, ClientManager};
+use crate::data::client::{AuthenticationFlow, ClientID, ClientManager};
 use crate::data::code_challenge::CodeChallenge;
 use crate::data::current_user::CurrentUser;
 use crate::data::id_token::IdToken;
@@ -162,14 +162,6 @@ pub async fn authorize(
         return error_redirect(&query, "invalid_request", "openid scope missing!");
     }
 
-    if !query.response_type.eq("code") {
-        return error_redirect(
-            &query,
-            "invalid_request",
-            "Only code response type is supported!",
-        );
-    }
-
     if query.state.as_ref().map(String::is_empty).unwrap_or(false) {
         return error_redirect(&query, "invalid_request", "State is specified but empty!");
     }
@@ -201,6 +193,13 @@ pub async fn authorize(
         );
     }
 
+    // Check that requested authorization flow is supported
+    if query.response_type != "code" && query.response_type != "id_token" {
+        return error_redirect(&query, "invalid_request", "Unsupported authorization flow!");
+    }
+
+    match (client.auth_flow(), query.response_type.as_str()) {
+        (AuthenticationFlow::AuthorizationCode, "code") => {
             // Save all authentication information in memory
             let session = Session {
                 session_id: SessionID(rand_str(OPEN_ID_SESSION_LEN)),
@@ -240,6 +239,23 @@ pub async fn authorize(
                     ),
                 ))
                 .finish()
+        }
+
+        //(AuthenticationFlow::Implicit, "id_token") => {}
+        (flow, code) => {
+            log::warn!(
+                "For client {:?}, configured with flow {:?}, made request with code {}",
+                client.id,
+                flow,
+                code
+            );
+            error_redirect(
+                &query,
+                "invalid_request",
+                "Requested authentication flow is unsupported / not configured for this client!",
+            )
+        }
+    }
 }
 
 #[derive(serde::Serialize)]

src/data/client.rs

@@ -4,6 +4,7 @@ use crate::utils::string_utils::apply_env_vars;
 #[derive(Clone, Debug, serde::Serialize, serde::Deserialize, Eq, PartialEq)]
 pub struct ClientID(pub String);
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub enum AuthenticationFlow {
     AuthorizationCode,
     Implicit,