[management] Add idp timeout env variable (#4647)

Introduced the NETBIRD_IDP_TIMEOUT environment variable to the management service. This allows configuring a timeout for supported IDPs. If the variable is unset or contains an invalid value, a default timeout of 10 seconds is used as a fallback.

This is needed for larger IDP environments where 10s is just not enough time.

management/server/idp/util.go

@@ -4,7 +4,9 @@ import (
 	"encoding/json"
 	"math/rand"
 	"net/url"
+	"os"
 	"strings"
+	"time"
 )
 
 var (
@@ -69,3 +71,24 @@ func baseURL(rawURL string) string {
 
 	return parsedURL.Scheme + "://" + parsedURL.Host
 }
+
+const (
+	// Provides the env variable name for use with idpTimeout function
+	idpTimeoutEnv = "NB_IDP_TIMEOUT"
+	// Sets the defaultTimeout to 10s.
+	defaultTimeout  = 10 * time.Second
+)
+
+// idpTimeout returns a timeout value for the IDP
+func idpTimeout() time.Duration {
+	timeoutStr, ok := os.LookupEnv(idpTimeoutEnv)
+	if !ok || timeoutStr == "" {
+		return defaultTimeout
+	}
+
+	timeout, err := time.ParseDuration(timeoutStr)
+	if err != nil {
+		return defaultTimeout
+	}
+	return timeout
+}