Prometheus Scaler: Remove trailing whitespaces in customAuthHeader an…

…d customAuthValue (kedacore#4959)

Co-authored-by: Jorge Turrado Ferrero <Jorge_turrado@hotmail.es>

CHANGELOG.md

@@ -60,6 +60,7 @@ To learn more about active deprecations, we recommend checking [GitHub Discussio
 - **General**: Update golangci-lint version documented in CONTRIBUTING.md since old version doesn't support go 1.20 (N/A)
 - **General**: Updated AWS SDK and updated all the aws scalers ([#4905](https://github.com/kedacore/keda/issues/4905))
 - **Azure Pod Identity**: Introduce validation to prevent usage of empty identity ID for Azure identity providers ([#4528](https://github.com/kedacore/keda/issues/4528))
+- **Prometheus Scaler**: Remove trailing whitespaces in customAuthHeader and customAuthValue ([#4960](https://github.com/kedacore/keda/issues/4960))
 
 ### Fixes
 - **RabbitMQ Scaler**: Allow subpaths along with vhost in connection string ([#2634](https://github.com/kedacore/keda/issues/2634))

pkg/scalers/authentication/authentication_helpers.go

@@ -73,12 +73,12 @@ func GetAuthConfigs(triggerMetadata, authParams map[string]string) (out *AuthMet
 			if len(authParams["customAuthHeader"]) == 0 {
 				return nil, errors.New("no custom auth header given")
 			}
-			out.CustomAuthHeader = authParams["customAuthHeader"]
+			out.CustomAuthHeader = strings.TrimSuffix(authParams["customAuthHeader"], "\n")
 
 			if len(authParams["customAuthValue"]) == 0 {
 				return nil, errors.New("no custom auth value given")
 			}
-			out.CustomAuthValue = authParams["customAuthValue"]
+			out.CustomAuthValue = strings.TrimSuffix(authParams["customAuthValue"], "\n")
 			out.EnableCustomAuth = true
 		default:
 			return nil, fmt.Errorf("incorrect value for authMode is given: %s", t)

pkg/scalers/prometheus_scaler_test.go

@@ -101,6 +101,8 @@ var testPrometheusAuthMetadata = []prometheusAuthMetadataTestData{
 	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "authModes": "custom"}, map[string]string{"customAuthHeader": ""}, "", true},
 	// fail custom auth with no customAuthValue
 	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "authModes": "custom"}, map[string]string{"customAuthValue": ""}, "", true},
+	// success custom auth with newlines in customAuthHeader
+	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "authModes": "custom"}, map[string]string{"customAuthHeader": "header\n", "customAuthValue": "value\n"}, "", false},
 
 	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "authModes": "tls,basic"}, map[string]string{"username": "user", "password": "pass"}, "", true},
 	// pod identity and other auth modes enabled together