feat: Enhance host extraction from headers (#2292)

- Refactor SUBController subs and subJsons methods to extract host from X-Forwarded-Host header, falling back to X-Real-IP header and then to the request host if unavailable.
- Update html function to extract host from X-Forwarded-Host header, falling back to X-Real-IP header and then to the request host if unavailable.
- Update DomainValidatorMiddleware to first attempt to extract host from X-Forwarded-Host header, falling back to X-Real-IP header and then to the request host.

Fixes: #2284

Signed-off-by: Ahmad Thoriq Najahi <najahi@zephyrus.id>

1 files changed, 12 insertions, 1 deletions

diff --git a/web/controller/util.go b/web/controller/util.go
index 17ad75e4..b07aaf0e 100644
--- a/web/controller/util.go
+++ b/web/controller/util.go
@@ -64,7 +64,18 @@ func html(c *gin.Context, name string, title string, data gin.H) {
 		data = gin.H{}
 	}
 	data["title"] = title
-	data["host"], _, _ = net.SplitHostPort(c.Request.Host)
+	host := c.GetHeader("X-Forwarded-Host")
+	if host == "" {
+		host = c.GetHeader("X-Real-IP")
+	}
+	if host == "" {
+		var err error
+		host, _, err = net.SplitHostPort(c.Request.Host)
+		if err != nil {
+			host = c.Request.Host
+		}
+	}
+	data["host"] = host
 	data["request_uri"] = c.Request.RequestURI
 	data["base_path"] = c.GetString("base_path")
 	c.HTML(http.StatusOK, name, getContext(data))