From 77b56a21787505a1b22692cdc1ba15a6d916952f Mon Sep 17 00:00:00 2001
From: kevin <5299031+kevin9327@users.noreply.github.com>
Date: Mon, 2 Nov 2026 23:22:43 +0900
Subject: [PATCH] fix(url): keep capitalized mailto: and tel: links as they are
 (#7052)

EnsureURLScheme matched the mailto: and tel: prefixes case-sensitively, so a support link typed as Mailto: or TEL: (phone keyboards capitalize the first letter) got https:// prepended and opened a broken web page. URL schemes are case-insensitive, and the check now is too.
---
 internal/util/common/url.go      | 7 +++++--
 internal/util/common/url_test.go | 2 ++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/internal/util/common/url.go b/internal/util/common/url.go
index 13a71323b..c6cb2e4b8 100644
--- a/internal/util/common/url.go
+++ b/internal/util/common/url.go
@@ -16,9 +16,12 @@ func EnsureURLScheme(raw string) string {
 	if trimmed == "" {
 		return ""
 	}
+	// Schemes are case-insensitive (RFC 3986), and phone keyboards often
+	// capitalize the first letter ("Mailto:", "Tel:").
+	lower := strings.ToLower(trimmed)
 	if strings.Contains(trimmed, "://") ||
-		strings.HasPrefix(trimmed, "mailto:") ||
-		strings.HasPrefix(trimmed, "tel:") {
+		strings.HasPrefix(lower, "mailto:") ||
+		strings.HasPrefix(lower, "tel:") {
 		return trimmed
 	}
 	return "https://" + trimmed
diff --git a/internal/util/common/url_test.go b/internal/util/common/url_test.go
index 167ff6650..2d182294a 100644
--- a/internal/util/common/url_test.go
+++ b/internal/util/common/url_test.go
@@ -18,6 +18,8 @@ func TestEnsureURLScheme(t *testing.T) {
 		{"mailto", "mailto:support@example.com", "mailto:support@example.com"},
 		{"tel", "tel:+1234567890", "tel:+1234567890"},
 		{"trims whitespace", "  t.me/xui_support  ", "https://t.me/xui_support"},
+		{"capitalized mailto", "Mailto:support@example.com", "Mailto:support@example.com"},
+		{"uppercase tel", "TEL:+1234567890", "TEL:+1234567890"},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {