Add Origin validation

is/rules.go

@@ -122,6 +122,8 @@ var (
 	ErrSSN = validation.NewError("validation_is_ssn", "must be a valid social security number")
 	// ErrSemver is the error that returns in case of an invalid semver.
 	ErrSemver = validation.NewError("validation_is_semver", "must be a valid semantic version")
+	// ErrOrigin is the error that returns in case of an invalid origin.
+	ErrOrigin = validation.NewError("validation_is_origin", "must be a valid origin")
 )
 
 var (
@@ -235,6 +237,8 @@ var (
 	SSN = validation.NewStringRuleWithError(govalidator.IsSSN, ErrSSN)
 	// Semver validates if a string is a valid semantic version
 	Semver = validation.NewStringRuleWithError(govalidator.IsSemver, ErrSemver)
+	// Origin validates if a string is valid origin
+	Origin = validation.NewStringRuleWithError(isOrigin, ErrOrigin)
 )
 
 var (
@@ -247,6 +251,8 @@ var (
 	// Slightly modified: Removed 255 max length validation since Go regex does not
 	// support lookarounds. More info: https://stackoverflow.com/a/38935027
 	reDomain = regexp.MustCompile(`^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-z0-9])?\.)+(?:[a-zA-Z]{1,63}| xn--[a-z0-9]{1,59})$`)
+	// Origin https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
+	reOrigin = regexp.MustCompile(`^(https?):\/\/([a-zA-Z0-9-]+\.)*[a-zA-Z0-9-]+(\.[a-zA-Z]{2,})?(:\d+)?$`)
 )
 
 func isISBN(value string) bool {
@@ -281,3 +287,11 @@ func isUTFNumeric(value string) bool {
 	}
 	return true
 }
+
+func isOrigin(value string) bool {
+	if len(value) > 255 {
+		return false
+	}
+
+	return reOrigin.MatchString(value)
+}

is/rules_test.go

@@ -76,6 +76,8 @@ func TestAll(t *testing.T) {
 		{"Int", Int, "100", "1.1", "must be an integer number"},
 		{"Float", Float, "1.1", "a.1", "must be a floating point number"},
 		{"VariableWidth", VariableWidth, "", "", ""},
+		{"Origin", Origin, "https://example.com", "example.com", "must be a valid origin"},
+		{"Origin", Origin, "https://127.0.0.1:8080", "ws://example.com", "must be a valid origin"},
 	}
 
 	for _, test := range tests {