GRA-1298: License check changes, free tier limits for saas (#2418)

* set free tier limits through config

* add host limit to config

* check for host limit on free tier

* fix license validation, replace node limit with hosts

* add hosts to telemetry data

* debug init

* validate license every 1hr

* hook manager, api to fetch server usage

* hook manager, server usage api

* encode json server usage api

* update ngork url

* update license validation endpoint

* avoid setting limits on eer

* adding hotfix

* correct users limits env var

* add comments to exported funcs

---------

Co-authored-by: afeiszli <alex.feiszli@gmail.com>

servercfg/serverconf.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/gravitl/netmaker/config"
+
 	"github.com/gravitl/netmaker/models"
 )
 
@@ -741,6 +742,58 @@ func IsProxyEnabled() bool {
 	return enabled
 }
 
+// GetNetworkLimit - fetches free tier limits on users
+func GetUserLimit() int {
+	var userslimit int
+	if os.Getenv("USERS_LIMIT") != "" {
+		userslimit, _ = strconv.Atoi(os.Getenv("USERS_LIMIT"))
+	} else {
+		userslimit = config.Config.Server.UsersLimit
+	}
+	return userslimit
+}
+
+// GetNetworkLimit - fetches free tier limits on networks
+func GetNetworkLimit() int {
+	var networkslimit int
+	if os.Getenv("NETWORKS_LIMIT") != "" {
+		networkslimit, _ = strconv.Atoi(os.Getenv("NETWORKS_LIMIT"))
+	} else {
+		networkslimit = config.Config.Server.NetworksLimit
+	}
+	return networkslimit
+}
+
+// GetClientLimit - fetches free tier limits on ext. clients
+func GetClientLimit() int {
+	var clientsLimit int
+	if os.Getenv("CLIENTS_LIMIT") != "" {
+		clientsLimit, _ = strconv.Atoi(os.Getenv("CLIENTS_LIMIT"))
+	} else {
+		clientsLimit = config.Config.Server.ClientsLimit
+	}
+	return clientsLimit
+}
+
+// GetHostLimit - fetches free tier limits on hosts
+func GetHostLimit() int {
+	var hostsLimit int
+	if os.Getenv("HOSTS_LIMIT") != "" {
+		hostsLimit, _ = strconv.Atoi(os.Getenv("HOSTS_LIMIT"))
+	} else {
+		hostsLimit = config.Config.Server.HostsLimit
+	}
+	return hostsLimit
+}
+
+// DeployedByOperator - returns true if the instance is deployed by netmaker operator
+func DeployedByOperator() bool {
+	if os.Getenv("DEPLOYED_BY_OPERATOR") != "" {
+		return os.Getenv("DEPLOYED_BY_OPERATOR") == "true"
+	}
+	return config.Config.Server.DeployedByOperator
+}
+
 // GetDefaultProxyMode - default proxy mode for a server
 func GetDefaultProxyMode() config.ProxyMode {
 	var (