Force OpenID UID to be lowercase

app/classes/oidc/CoreIDAdapter.js

@@ -18,6 +18,10 @@ class CoreIDAdapter {
             expiresAt = new Date(Date.now() + (expiresIn * 1000))
         }
 
+        if ( payload.uid ) {
+            payload.uid = payload.uid.toLowerCase()
+        }
+
         await this.coll().updateOne(
             { _id },
             { $set: { payload, ...(expiresAt ? { expiresAt } : undefined) } },
@@ -49,7 +53,7 @@ class CoreIDAdapter {
 
     async findByUid(uid) {
         const result = await this.coll().find(
-            { 'payload.uid': uid },
+            { 'payload.uid': uid.toLowerCase() },
             { payload: 1 },
         ).limit(1).next()