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Fix OAuth issuer URL behind reverse proxy #458

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Merged
asim merged 1 commit into from
Mar 28, 2026
Merged

Fix OAuth issuer URL behind reverse proxy #458

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24 changes: 15 additions & 9 deletions internal/auth/oauth.go
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Original file line number Diff line number Diff line change
Expand Up @@ -177,13 +177,23 @@ func generateRandomString(n int) string {
return base64.RawURLEncoding.EncodeToString(b)[:n]
}

// OAuthMetadataHandler serves /.well-known/oauth-authorization-server
func OAuthMetadataHandler(w http.ResponseWriter, r *http.Request) {
func getIssuer(r *http.Request) string {
host := r.Host
if fh := r.Header.Get("X-Forwarded-Host"); fh != "" {
host = fh
}
scheme := "https"
if r.TLS == nil && !strings.Contains(r.Host, "mu.xyz") {
if fp := r.Header.Get("X-Forwarded-Proto"); fp != "" {
scheme = fp
} else if r.TLS == nil && !strings.Contains(host, ".") {
scheme = "http"
}
issuer := scheme + "://" + r.Host
return scheme + "://" + host
}

// OAuthMetadataHandler serves /.well-known/oauth-authorization-server
func OAuthMetadataHandler(w http.ResponseWriter, r *http.Request) {
issuer := getIssuer(r)

w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(map[string]interface{}{
Expand All @@ -201,11 +211,7 @@ func OAuthMetadataHandler(w http.ResponseWriter, r *http.Request) {

// OAuthResourceHandler serves /.well-known/oauth-protected-resource
func OAuthResourceHandler(w http.ResponseWriter, r *http.Request) {
scheme := "https"
if r.TLS == nil && !strings.Contains(r.Host, "mu.xyz") {
scheme = "http"
}
issuer := scheme + "://" + r.Host
issuer := getIssuer(r)

w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(map[string]interface{}{
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