feat: Update AssertionMethod Validator

x/did/types/diddoc_diddoc.go

@@ -96,8 +96,7 @@ func (didDoc DidDoc) Validate(allowedNamespaces []string) error {
 			IsUniqueStrList(), validation.Each(IsDIDUrl(allowedNamespaces, Empty, Empty, Required), HasPrefix(didDoc.Id)),
 		),
 		validation.Field(&didDoc.AssertionMethod,
-			IsUniqueStrList(), validation.Each(IsDIDUrl(allowedNamespaces, Empty, Empty, Required), HasPrefix(didDoc.Id)),
-		),
+			IsUniqueStrList(), validation.Each(IsAssertionMethod(allowedNamespaces))),
 		validation.Field(&didDoc.CapabilityInvocation,
 			IsUniqueStrList(), validation.Each(IsDIDUrl(allowedNamespaces, Empty, Empty, Required), HasPrefix(didDoc.Id)),
 		),

x/did/types/validate.go

@@ -1,8 +1,10 @@
 package types
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
+	"strconv"
 	"strings"
 
 	validation "github.com/go-ozzo/ozzo-validation/v4"
@@ -105,6 +107,44 @@ func IsDIDUrl(allowedNamespaces []string, pathRule, queryRule, fragmentRule Vali
 	})
 }
 
+type AssertionMethod struct {
+	Id string
+	Type string
+	Controller []string
+
+}
+
+func IsAssertionMethod(allowedNamespaces []string) *CustomErrorRule {
+	return NewCustomErrorRule(func(value interface{}) error {
+		err := IsDIDUrl(allowedNamespaces, Empty, Empty, Required).Validate(value)
+		if err != nil {
+			casted, ok := value.(string)
+			if !ok {
+				panic("IsAssertionMethod must be only applied on string properties")
+			}
+
+			unescapedJSON, err := strconv.Unquote(casted)
+			if err != nil {
+				return errors.New("assertionMethod should be a DIDUrl or an Escaped JSON string") 
+			}
+
+			var result AssertionMethod
+			err = json.Unmarshal([]byte(unescapedJSON), &result)
+			if err != nil {
+				return errors.New("assertionMethod should be a DIDUrl or an Escaped JSON string") 
+			}
+
+			return validation.ValidateStruct(&result,
+				validation.Field(&result.Id, validation.Required, IsDIDUrl(allowedNamespaces, Empty, Empty, Required)),
+				validation.Field(&result.Controller, validation.Required, IsUniqueStrList(), validation.Each(IsDID(allowedNamespaces))),
+				validation.Field(&result.Type, IsStr()),
+			)
+		}
+
+		return nil
+	})
+}
+
 func IsURI() *CustomErrorRule {
 	return NewCustomErrorRule(func(value interface{}) error {
 		casted, ok := value.(string)
@@ -221,3 +261,14 @@ func IsUUID() *CustomErrorRule {
 		return utils.ValidateUUID(casted)
 	})
 }
+
+func IsStr() *CustomErrorRule {
+	return NewCustomErrorRule(func(value interface{}) error {
+		_, ok := value.([]string)
+		if !ok {
+			panic("IsSet must be only applied on string array properties")
+		}
+
+		return nil
+	})
+}

x/did/utils/encoding.go

@@ -88,3 +88,4 @@ func ValidateBase58Ed25519VerificationKey2018(data string) error {
 	}
 	return ValidateEd25519PubKey(pubKey)
 }
+