Support basic account action for admin (yorkie-team#934)

Add the admin APIs ChangePassword and DeleteAccount to enhance the functionality and provide basic account actions for administrators themselves.

api/types/signup_fields.go → api/types/user_fields.go

@@ -21,16 +21,16 @@ import (
 	"github.com/yorkie-team/yorkie/internal/validation"
 )
 
-// SignupFields is a set of fields that use to sign up to yorkie server.
-type SignupFields struct {
+// UserFields is a set of fields that use to sign up or change password to yorkie server.
+type UserFields struct {
 	// Username is the name of user.
 	Username *string `bson:"username" validate:"required,min=2,max=30,slug"`
 
 	// Password is the password of user.
 	Password *string `bson:"password" validate:"required,min=8,max=30,alpha_num_special"`
 }
 
-// Validate validates the SignupFields.
-func (i *SignupFields) Validate() error {
+// Validate validates the UserFields.
+func (i *UserFields) Validate() error {
 	return validation.ValidateStruct(i)
 }

api/types/signup_fields_test.go → api/types/user_fields_test.go

@@ -31,56 +31,56 @@ func TestSignupFields(t *testing.T) {
 	t.Run("password validation test", func(t *testing.T) {
 		validUsername := "test"
 		validPassword := "pass123!"
-		fields := &types.SignupFields{
+		fields := &types.UserFields{
 			Username: &validUsername,
 			Password: &validPassword,
 		}
 		assert.NoError(t, fields.Validate())
 
 		invalidPassword := "1234"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}
 		assert.ErrorAs(t, fields.Validate(), &structError)
 
 		invalidPassword = "abcd"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}
 		assert.ErrorAs(t, fields.Validate(), &structError)
 
 		invalidPassword = "!@#$"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}
 		assert.ErrorAs(t, fields.Validate(), &structError)
 
 		invalidPassword = "abcd1234"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}
 		assert.ErrorAs(t, fields.Validate(), &structError)
 
 		invalidPassword = "abcd!@#$"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}
 		assert.ErrorAs(t, fields.Validate(), &structError)
 
 		invalidPassword = "1234!@#$"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}
 		assert.ErrorAs(t, fields.Validate(), &structError)
 
 		invalidPassword = "abcd1234!@abcd1234!@abcd1234!@1"
-		fields = &types.SignupFields{
+		fields = &types.UserFields{
 			Username: &validUsername,
 			Password: &invalidPassword,
 		}