chore: add common identify resolvers for oidc auth provider

Signed-off-by: mingfu <mingfu@alauda.io>

.changeset/silent-nails-bake.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-backend': patch
+---
+
+Add common identify resolvers for `oidc` auth provider.

plugins/auth-backend/api-report.md

@@ -641,7 +641,10 @@ export const providers: Readonly<{
           }
         | undefined,
     ) => AuthProviderFactory;
-    resolvers: never;
+    resolvers: Readonly<{
+      emailLocalPartMatchingUserEntityName: () => SignInResolver<unknown>;
+      emailMatchingUserEntityProfileEmail: () => SignInResolver<unknown>;
+    }>;
   }>;
   okta: Readonly<{
     create: (

plugins/auth-backend/src/providers/oidc/provider.ts

@@ -44,6 +44,10 @@ import {
   SignInResolver,
 } from '../types';
 import { createAuthProviderIntegration } from '../createAuthProviderIntegration';
+import {
+  commonByEmailLocalPartResolver,
+  commonByEmailResolver,
+} from '../resolvers';
 
 type PrivateInfo = {
   refreshToken?: string;
@@ -255,4 +259,14 @@ export const oidc = createAuthProviderIntegration({
         });
       });
   },
+  resolvers: {
+    /**
+     * Looks up the user by matching their email local part to the entity name.
+     */
+    emailLocalPartMatchingUserEntityName: () => commonByEmailLocalPartResolver,
+    /**
+     * Looks up the user by matching their email to the entity email.
+     */
+    emailMatchingUserEntityProfileEmail: () => commonByEmailResolver,
+  },
 });