feat(dns): allow to specify http(s) ports without hostname to default to cluster domain

internal/api/port.go

@@ -62,9 +62,6 @@ func (p *PortSpec) Validate() error {
 				return fmt.Errorf("invalid hostname '%s': %w", p.Hostname, err)
 			}
 		}
-		if p.Hostname == "" && (p.Protocol == ProtocolHTTP || p.Protocol == ProtocolHTTPS) {
-			return fmt.Errorf("hostname is required with '%s' or '%s' protocols", ProtocolHTTP, ProtocolHTTPS)
-		}
 	case PortModeHost:
 		if p.PublishedPort == 0 {
 			return fmt.Errorf("published port is required in %s mode", PortModeHost)
@@ -216,9 +213,7 @@ func ParsePortSpec(port string) (PortSpec, error) {
 				return spec, fmt.Errorf("invalid host IP '%s': %w", parts[0], err)
 			}
 		} else {
-			if parts[0] == "" {
-				return spec, fmt.Errorf("hostname must not be empty")
-			}
+			// Hostname may be empty.
 			spec.Hostname = parts[0]
 		}
 

internal/api/port_test.go

@@ -50,6 +50,22 @@ func TestPortSpec_Validate(t *testing.T) {
 				Mode:          PortModeIngress,
 			},
 		},
+		{
+			name: "ingress mode without hostname http",
+			spec: PortSpec{
+				ContainerPort: 8080,
+				Protocol:      ProtocolHTTP,
+				Mode:          PortModeIngress,
+			},
+		},
+		{
+			name: "ingress mode without hostname https",
+			spec: PortSpec{
+				ContainerPort: 8080,
+				Protocol:      ProtocolHTTPS,
+				Mode:          PortModeIngress,
+			},
+		},
 		{
 			name: "ingress mode with hostname and http",
 			spec: PortSpec{
@@ -164,24 +180,6 @@ func TestPortSpec_Validate(t *testing.T) {
 			},
 			wantErr: "invalid hostname 'app': must be a valid domain name containing at least one dot",
 		},
-		{
-			name: "missing hostname with http",
-			spec: PortSpec{
-				ContainerPort: 8080,
-				Protocol:      ProtocolHTTP,
-				Mode:          PortModeIngress,
-			},
-			wantErr: "hostname is required with 'http' or 'https' protocols",
-		},
-		{
-			name: "missing hostname with https",
-			spec: PortSpec{
-				ContainerPort: 8080,
-				Protocol:      ProtocolHTTPS,
-				Mode:          PortModeIngress,
-			},
-			wantErr: "hostname is required with 'http' or 'https' protocols",
-		},
 		{
 			name: "host IP in ingress mode",
 			spec: PortSpec{
@@ -468,6 +466,15 @@ func TestParsePortSpec(t *testing.T) {
 				Mode:          PortModeIngress,
 			},
 		},
+		{
+			name: "container port http without hostname",
+			port: "8080/http",
+			expected: PortSpec{
+				ContainerPort: 8080,
+				Protocol:      ProtocolHTTP,
+				Mode:          PortModeIngress,
+			},
+		},
 		{
 			name: "hostname and container port http",
 			port: "app.example.com:8080/http",
@@ -602,21 +609,6 @@ func TestParsePortSpec(t *testing.T) {
 			port:    "app.example.com:invalid:8080",
 			wantErr: "invalid published port",
 		},
-		{
-			name:    "missing hostname with http",
-			port:    "8080/http",
-			wantErr: "hostname is required",
-		},
-		{
-			name:    "missing hostname with http",
-			port:    "8080/https",
-			wantErr: "hostname is required",
-		},
-		{
-			name:    "missing hostname with published https port",
-			port:    "8000:8080/https",
-			wantErr: "hostname is required",
-		},
 		{
 			name:    "invalid hostname",
 			port:    "app:8080/http",