MongoDB validator improved (#1196)

## Enhances

Added MongoDB connection string validation


**Make sure that you've checked the boxes below before you submit PR:**
- [x] Tests exist or have been written that cover this particular
change.

@go-playground/validator-maintainers

README.md

@@ -163,6 +163,7 @@ validate := validator.New(validator.WithRequiredStructEnabled())
 | btc_addr_bech32 | Bitcoin Bech32 Address (segwit) |
 | credit_card | Credit Card Number |
 | mongodb | MongoDB ObjectID |
+| mongodb_connection_string | MongoDB Connection String |
 | cron | Cron |
 | spicedb | SpiceDb ObjectID/Permission/Type |
 | datetime | Datetime |

baked_in.go

@@ -235,7 +235,8 @@ var (
 		"credit_card":                   isCreditCard,
 		"cve":                           isCveFormat,
 		"luhn_checksum":                 hasLuhnChecksum,
-		"mongodb":                       isMongoDB,
+		"mongodb":                       isMongoDBObjectId,
+		"mongodb_connection_string":     isMongoDBConnectionString,
 		"cron":                          isCron,
 		"spicedb":                       isSpiceDB,
 	}
@@ -2926,10 +2927,16 @@ func digitsHaveLuhnChecksum(digits []string) bool {
 	return (sum % 10) == 0
 }
 
-// isMongoDB is the validation function for validating if the current field's value is valid mongoDB objectID
-func isMongoDB(fl FieldLevel) bool {
+// isMongoDBObjectId is the validation function for validating if the current field's value is valid MongoDB ObjectID
+func isMongoDBObjectId(fl FieldLevel) bool {
 	val := fl.Field().String()
-	return mongodbRegex.MatchString(val)
+	return mongodbIdRegex.MatchString(val)
+}
+
+// isMongoDBConnectionString is the validation function for validating if the current field's value is valid MongoDB Connection String
+func isMongoDBConnectionString(fl FieldLevel) bool {
+	val := fl.Field().String()
+	return mongodbConnectionRegex.MatchString(val)
 }
 
 // isSpiceDB is the validation function for validating if the current field's value is valid for use with Authzed SpiceDB in the indicated way

doc.go

@@ -1386,11 +1386,19 @@ This validates that a string value contains a valid credit card number using Luh
 
 This validates that a string or (u)int value contains a valid checksum using the Luhn algorithm.
 
-# MongoDb ObjectID
+# MongoDB
 
-This validates that a string is a valid 24 character hexadecimal string.
+This validates that a string is a valid 24 character hexadecimal string or valid connection string.
 
 	Usage: mongodb
+	       mongodb_connection_string
+
+Example:
+
+	type Test struct {
+		ObjectIdField         string `validate:"mongodb"`
+		ConnectionStringField string `validate:"mongodb_connection_string"`
+	}
 
 # Cron
 

regexes.go

@@ -68,7 +68,8 @@ const (
 	semverRegexString                = `^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$` // numbered capture groups https://semver.org/
 	dnsRegexStringRFC1035Label       = "^[a-z]([-a-z0-9]*[a-z0-9]){0,62}$"
 	cveRegexString                   = `^CVE-(1999|2\d{3})-(0[^0]\d{2}|0\d[^0]\d{1}|0\d{2}[^0]|[1-9]{1}\d{3,})$` // CVE Format Id https://cve.mitre.org/cve/identifiers/syntaxchange.html
-	mongodbRegexString               = "^[a-f\\d]{24}$"
+	mongodbIdRegexString             = "^[a-f\\d]{24}$"
+	mongodbConnStringRegexString     = "^mongodb(\\+srv)?:\\/\\/(([a-zA-Z\\d]+):([a-zA-Z\\d$:\\/?#\\[\\]@]+)@)?(([a-z\\d.-]+)(:[\\d]+)?)((,(([a-z\\d.-]+)(:(\\d+))?))*)?(\\/[a-zA-Z-_]{1,64})?(\\?(([a-zA-Z]+)=([a-zA-Z\\d]+))(&(([a-zA-Z\\d]+)=([a-zA-Z\\d]+))?)*)?$"
 	cronRegexString                  = `(@(annually|yearly|monthly|weekly|daily|hourly|reboot))|(@every (\d+(ns|us|µs|ms|s|m|h))+)|((((\d+,)+\d+|(\d+(\/|-)\d+)|\d+|\*) ?){5,7})`
 	spicedbIDRegexString             = `^(([a-zA-Z0-9/_|\-=+]{1,})|\*)$`
 	spicedbPermissionRegexString     = "^([a-z][a-z0-9_]{1,62}[a-z0-9])?$"
@@ -139,7 +140,8 @@ var (
 	semverRegex                = regexp.MustCompile(semverRegexString)
 	dnsRegexRFC1035Label       = regexp.MustCompile(dnsRegexStringRFC1035Label)
 	cveRegex                   = regexp.MustCompile(cveRegexString)
-	mongodbRegex               = regexp.MustCompile(mongodbRegexString)
+	mongodbIdRegex             = regexp.MustCompile(mongodbIdRegexString)
+	mongodbConnectionRegex     = regexp.MustCompile(mongodbConnStringRegexString)
 	cronRegex                  = regexp.MustCompile(cronRegexString)
 	spicedbIDRegex             = regexp.MustCompile(spicedbIDRegexString)
 	spicedbPermissionRegex     = regexp.MustCompile(spicedbPermissionRegexString)

validator_test.go

@@ -13386,6 +13386,58 @@ func TestMongoDBObjectIDFormatValidation(t *testing.T) {
 		}
 	}
 }
+func TestMongoDBConnectionStringFormatValidation(t *testing.T) {
+	tests := []struct {
+		value    string `validate:"mongodb_connection_string"`
+		tag      string
+		expected bool
+	}{
+		{"mongodb://username:password@server.example.com:20017/database?replicaSet=test&connectTimeoutMS=300000&ssl=true", "mongodb_connection_string", true},
+		{"mongodb+srv://username:password@server.example.com:20017/database?replicaSet=test&connectTimeoutMS=300000&ssl=true", "mongodb_connection_string", true},
+		{"mongodb+srv://username:password@server.example.com:20017,server.example.com,server.example.com:20017/database?replicaSet=test&connectTimeoutMS=300000&ssl=true", "mongodb_connection_string", true},
+		{"mongodb+srv://username:password@server.example.com:20017,server.example.com,server.example.com:20017?replicaSet=test&connectTimeoutMS=300000&ssl=true", "mongodb_connection_string", true},
+		{"mongodb://username:password@server.example.com:20017,server.example.com,server.example.com:20017/database?replicaSet=test&connectTimeoutMS=300000&ssl=true", "mongodb_connection_string", true},
+		{"mongodb://localhost", "mongodb_connection_string", true},
+		{"mongodb://localhost:27017", "mongodb_connection_string", true},
+		{"localhost", "mongodb_connection_string", false},
+		{"mongodb://", "mongodb_connection_string", false},
+		{"mongodb+srv://", "mongodb_connection_string", false},
+		{"mongodbsrv://localhost", "mongodb_connection_string", false},
+		{"mongodb+srv://localhost", "mongodb_connection_string", true},
+		{"mongodb+srv://localhost:27017", "mongodb_connection_string", true},
+		{"mongodb+srv://localhost?replicaSet=test", "mongodb_connection_string", true},
+		{"mongodb+srv://localhost:27017?replicaSet=test", "mongodb_connection_string", true},
+		{"mongodb+srv://localhost:27017?", "mongodb_connection_string", false},
+		{"mongodb+srv://localhost:27017?replicaSet", "mongodb_connection_string", false},
+		{"mongodb+srv://localhost/database", "mongodb_connection_string", true},
+		{"mongodb+srv://localhost:27017/database", "mongodb_connection_string", true},
+		{"mongodb+srv://username@localhost", "mongodb_connection_string", false},
+		{"mongodb+srv://username:password@localhost", "mongodb_connection_string", true},
+		{"mongodb+srv://username:password@localhost:27017", "mongodb_connection_string", true},
+		{"mongodb+srv://username:password@localhost:27017,192.0.0.7,192.0.0.9:27018,server.example.com", "mongodb_connection_string", true},
+	}
+
+	validate := New()
+
+	for i, test := range tests {
+		errs := validate.Var(test.value, test.tag)
+
+		if test.expected {
+			if !IsEqual(errs, nil) {
+				t.Fatalf("Index: %d mongodb_connection_string failed Error: %s", i, errs)
+			}
+		} else {
+			if IsEqual(errs, nil) {
+				t.Fatalf("Index: %d mongodb_connection_string failed Error: %s", i, errs)
+			} else {
+				val := getError(errs, "", "")
+				if val.Tag() != "mongodb_connection_string" {
+					t.Fatalf("Index: %d mongodb_connection_string failed Error: %s", i, errs)
+				}
+			}
+		}
+	}
+}
 
 func TestSpiceDBValueFormatValidation(t *testing.T) {
 	tests := []struct {