From 2c95fd41155e6c419145ed57acfeb32b8b59f3d6 Mon Sep 17 00:00:00 2001
From: tobi <31960611+tsmethurst@users.noreply.github.com>
Date: Tue, 11 Feb 2025 09:42:35 +0100
Subject: [bugfix] Suggest lowercase username when creating via OIDC (#3780)

---
 internal/api/auth/callback.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'internal/api')

diff --git a/internal/api/auth/callback.go b/internal/api/auth/callback.go
index 37c257229..2dc36fac8 100644
--- a/internal/api/auth/callback.go
+++ b/internal/api/auth/callback.go
@@ -145,12 +145,18 @@ func (m *Module) CallbackGETHandler(c *gin.Context) {
 			return
 		}
 
+		// Since we require lowercase usernames at this point, lowercase the one
+		// from the claims and use this to autofill the form with a suggestion.
+		//
+		// Pending https://github.com/superseriousbusiness/gotosocial/issues/1813
+		suggestedUsername := strings.ToLower(claims.PreferredUsername)
+
 		page := apiutil.WebPage{
 			Template: "finalize.tmpl",
 			Instance: instance,
 			Extra: map[string]any{
 				"name":              claims.Name,
-				"preferredUsername": claims.PreferredUsername,
+				"suggestedUsername": suggestedUsername,
 			},
 		}
 
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