Added support for custom email provider (#452)

management/email_provider.go

@@ -30,6 +30,9 @@ const (
 
 	// EmailProviderMS365 constant.
 	EmailProviderMS365 = "ms365"
+
+	// EmailProviderCustom constant.
+	EmailProviderCustom = "custom"
 )
 
 // EmailProvider is used to configure Email Providers.
@@ -118,6 +121,11 @@ type EmailProviderCredentialsMS365 struct {
 	ClientSecret *string `json:"clientSecret,omitempty"`
 }
 
+// EmailProviderCredentialsCustom represent the
+// credentials required to use the custom provider.
+type EmailProviderCredentialsCustom struct {
+}
+
 // EmailProviderSettingsMandrill are the provider
 // specific settings used by the mandrill provider.
 type EmailProviderSettingsMandrill struct {
@@ -226,6 +234,10 @@ func (ep *EmailProvider) UnmarshalJSON(b []byte) error {
 		credentials = &EmailProviderCredentialsMS365{}
 		// No settings for ms365.
 		settings = nil
+	case EmailProviderCustom:
+		credentials = &EmailProviderCredentialsCustom{}
+		// No settings for custom.
+		settings = nil
 	case "":
 		credentials = nil
 		settings = nil

management/email_provider_test.go

@@ -146,6 +146,16 @@ func TestEmailProviderJSON(t *testing.T) {
 			},
 			json: `{"name":"ms365","enabled":true,"default_from_address":"accounts@example.com","credentials":{"tenantId":"ms365_tenant_id","clientId":"ms365_client_id","clientSecret":"ms365_client_secret"}}`,
 		},
+		{
+			name: "it can %s a custom email provider",
+			emailProvider: &EmailProvider{
+				Name:               auth0.String("custom"),
+				Enabled:            auth0.Bool(true),
+				DefaultFromAddress: auth0.String("accounts@example.com"),
+				Credentials:        &EmailProviderCredentialsCustom{},
+			},
+			json: `{"name":"custom","enabled":true,"default_from_address":"accounts@example.com","credentials":{}}`,
+		},
 	}
 
 	for _, testCase := range jsonTestCases {