feat(endpoints): add domain-expiration-only-check

Author: qianlongzt

README.md

@@ -3136,6 +3136,11 @@ endpoints:
     conditions:
       - "[DOMAIN_EXPIRATION] > 720h"
       - "[CERTIFICATE_EXPIRATION] > 240h"
+  - name: check-domain-expiration-only
+    url: "domain://example.org"
+    interval: 1h
+    conditions:
+      - "[DOMAIN_EXPIRATION] > 720h"
 ```
 
 > ⚠ The usage of the `[DOMAIN_EXPIRATION]` placeholder requires Gatus to use RDAP, or as a fallback, send a request to the official IANA WHOIS service

config/endpoint/endpoint.go

@@ -53,6 +53,7 @@ const (
 	TypeGRPC     Type = "GRPC"
 	TypeWS       Type = "WEBSOCKET"
 	TypeSSH      Type = "SSH"
+	TypeDomain   Type = "DOMAIN"
 	TypeUNKNOWN  Type = "UNKNOWN"
 )
 
@@ -184,6 +185,8 @@ func (e *Endpoint) Type() Type {
 		return TypeWS
 	case strings.HasPrefix(e.URL, "ssh://"):
 		return TypeSSH
+	case strings.HasPrefix(e.URL, "domain://"):
+		return TypeDomain
 	default:
 		return TypeUNKNOWN
 	}
@@ -452,8 +455,12 @@ func (e *Endpoint) call(result *Result) {
 	var err error
 	var certificate *x509.Certificate
 	endpointType := e.Type()
-	if endpointType == TypeHTTP {
+	switch endpointType {
+	case TypeHTTP:
 		request = e.buildHTTPRequest()
+	case TypeDomain:
+		// domain expiration checked before call `call`
+		return
 	}
 	startTime := time.Now()
 	if endpointType == TypeDNS {

config/endpoint/endpoint_test.go

@@ -162,6 +162,27 @@ func TestEndpoint(t *testing.T) {
 				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
 			}),
 		},
+		{
+			Name: "domain-expiration-without-http-request",
+			Endpoint: Endpoint{
+				Name:       "domain-check",
+				URL:        "domain://twin.sh",
+				Conditions: []Condition{"[DOMAIN_EXPIRATION] > 100h"},
+				Interval:   5 * time.Minute,
+			},
+			ExpectedResult: &Result{
+				Success:   true,
+				Connected: false,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					{Condition: "[DOMAIN_EXPIRATION] > 100h", Success: true},
+				},
+				DomainExpiration: 999999 * time.Hour, // Note that this test only checks if it's non-zero.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+		},
 		{
 			Name: "endpoint-that-will-time-out-and-hidden-hostname",
 			Endpoint: Endpoint{
@@ -364,6 +385,12 @@ func TestEndpoint_Type(t *testing.T) {
 			},
 			want: TypeSSH,
 		},
+		{
+			args: args{
+				URL: "domain://example.org",
+			},
+			want: TypeDomain,
+		},
 		{
 			args: args{
 				URL: "invalid://example.org",