Add Initial BlueCat Provider Support

The new BlueCat provider uses the BlueCat API Gateway(REST API). Not
the legacy XML based BlueCat API.

https://github.com/bluecatlabs/gateway-workflows

main.go

@@ -33,6 +33,7 @@ import (
 	"sigs.k8s.io/external-dns/provider/aws"
 	"sigs.k8s.io/external-dns/provider/awssd"
 	"sigs.k8s.io/external-dns/provider/azure"
+	"sigs.k8s.io/external-dns/provider/bluecat"
 	"sigs.k8s.io/external-dns/provider/cloudflare"
 	"sigs.k8s.io/external-dns/provider/coredns"
 	"sigs.k8s.io/external-dns/provider/designate"
@@ -189,6 +190,8 @@ func main() {
 		p, err = azure.NewAzureProvider(cfg.AzureConfigFile, domainFilter, zoneIDFilter, cfg.AzureResourceGroup, cfg.AzureUserAssignedIdentityClientID, cfg.DryRun)
 	case "azure-private-dns":
 		p, err = azure.NewAzurePrivateDNSProvider(domainFilter, zoneIDFilter, cfg.AzureResourceGroup, cfg.AzureSubscriptionID, cfg.DryRun)
+	case "bluecat":
+		p, err = bluecat.NewBluecatProvider(cfg.BluecatConfigFile, domainFilter, zoneIDFilter, cfg.DryRun)
 	case "vinyldns":
 		p, err = vinyldns.NewVinylDNSProvider(domainFilter, zoneIDFilter, cfg.DryRun)
 	case "vultr":

pkg/apis/externaldns/types.go

@@ -76,6 +76,7 @@ type Config struct {
 	AzureResourceGroup                string
 	AzureSubscriptionID               string
 	AzureUserAssignedIdentityClientID string
+	BluecatConfigFile                 string
 	CloudflareProxied                 bool
 	CloudflareZonesPerPage            int
 	CoreDNSPrefix                     string
@@ -176,6 +177,7 @@ var defaultConfig = &Config{
 	AzureConfigFile:             "/etc/kubernetes/azure.json",
 	AzureResourceGroup:          "",
 	AzureSubscriptionID:         "",
+	BluecatConfigFile:           "/etc/kubernetes/bluecat.json",
 	CloudflareProxied:           false,
 	CloudflareZonesPerPage:      50,
 	CoreDNSPrefix:               "/skydns/",
@@ -312,7 +314,7 @@ func (cfg *Config) ParseFlags(args []string) error {
 	app.Flag("service-type-filter", "The service types to take care about (default: all, expected: ClusterIP, NodePort, LoadBalancer or ExternalName)").StringsVar(&cfg.ServiceTypeFilter)
 
 	// Flags related to providers
-	app.Flag("provider", "The DNS provider where the DNS records will be created (required, options: aws, aws-sd, google, azure, azure-dns, azure-private-dns, cloudflare, rcodezero, digitalocean, dnsimple, akamai, infoblox, dyn, designate, coredns, skydns, inmemory, ovh, pdns, oci, exoscale, linode, rfc2136, ns1, transip, vinyldns, rdns, vultr)").Required().PlaceHolder("provider").EnumVar(&cfg.Provider, "aws", "aws-sd", "google", "azure", "azure-dns", "azure-private-dns", "alibabacloud", "cloudflare", "rcodezero", "digitalocean", "dnsimple", "akamai", "infoblox", "dyn", "designate", "coredns", "skydns", "inmemory", "ovh", "pdns", "oci", "exoscale", "linode", "rfc2136", "ns1", "transip", "vinyldns", "rdns", "vultr")
+	app.Flag("provider", "The DNS provider where the DNS records will be created (required, options: aws, aws-sd, google, azure, azure-dns, azure-private-dns, bluecat, cloudflare, rcodezero, digitalocean, dnsimple, akamai, infoblox, dyn, designate, coredns, skydns, inmemory, ovh, pdns, oci, exoscale, linode, rfc2136, ns1, transip, vinyldns, rdns, vultr)").Required().PlaceHolder("provider").EnumVar(&cfg.Provider, "aws", "aws-sd", "google", "azure", "azure-dns", "azure-private-dns", "bluecat", "alibabacloud", "cloudflare", "rcodezero", "digitalocean", "dnsimple", "akamai", "infoblox", "dyn", "designate", "coredns", "skydns", "inmemory", "ovh", "pdns", "oci", "exoscale", "linode", "rfc2136", "ns1", "transip", "vinyldns", "rdns", "vultr")
 	app.Flag("domain-filter", "Limit possible target zones by a domain suffix; specify multiple times for multiple domains (optional)").Default("").StringsVar(&cfg.DomainFilter)
 	app.Flag("exclude-domains", "Exclude subdomains (optional)").Default("").StringsVar(&cfg.ExcludeDomains)
 	app.Flag("zone-id-filter", "Filter target zones by hosted zone id; specify multiple times for multiple zones (optional)").Default("").StringsVar(&cfg.ZoneIDFilter)
@@ -333,6 +335,7 @@ func (cfg *Config) ParseFlags(args []string) error {
 	app.Flag("azure-resource-group", "When using the Azure provider, override the Azure resource group to use (required when --provider=azure-private-dns)").Default(defaultConfig.AzureResourceGroup).StringVar(&cfg.AzureResourceGroup)
 	app.Flag("azure-subscription-id", "When using the Azure provider, specify the Azure configuration file (required when --provider=azure-private-dns)").Default(defaultConfig.AzureSubscriptionID).StringVar(&cfg.AzureSubscriptionID)
 	app.Flag("azure-user-assigned-identity-client-id", "When using the Azure provider, override the client id of user assigned identity in config file (optional)").Default("").StringVar(&cfg.AzureUserAssignedIdentityClientID)
+	app.Flag("bluecat-config-file", "When using the Bluecat provider, specify the Bluecat configuration file (required when --provider=bluecat").Default(defaultConfig.BluecatConfigFile).StringVar(&cfg.BluecatConfigFile)
 	app.Flag("cloudflare-proxied", "When using the Cloudflare provider, specify if the proxy mode must be enabled (default: disabled)").BoolVar(&cfg.CloudflareProxied)
 	app.Flag("cloudflare-zones-per-page", "When using the Cloudflare provider, specify how many zones per page listed, max. possible 50 (default: 50)").Default(strconv.Itoa(defaultConfig.CloudflareZonesPerPage)).IntVar(&cfg.CloudflareZonesPerPage)
 	app.Flag("coredns-prefix", "When using the CoreDNS provider, specify the prefix name").Default(defaultConfig.CoreDNSPrefix).StringVar(&cfg.CoreDNSPrefix)