[#2533] added VK OAuth2 provider

Co-authored-by: Valentine <xb2w1z@gmail.com>

apis/record_auth.go

@@ -139,9 +139,14 @@ func (api *recordAuthApi) authMethods(c echo.Context) error {
 			oauth2.SetAuthURLParam("code_challenge_method", codeChallengeMethod),
 		}
 
-		if name == auth.NameApple {
+		// custom providers url options
+		switch name {
+		case auth.NameApple:
 			// see https://developer.apple.com/documentation/sign_in_with_apple/sign_in_with_apple_js/incorporating_sign_in_with_apple_into_other_platforms#3332113
 			urlOpts = append(urlOpts, oauth2.SetAuthURLParam("response_mode", "query"))
+		case auth.NameVK:
+			// vk currently doesn't support PKCE for server-side authorization
+			urlOpts = []oauth2.AuthCodeOption{}
 		}
 
 		result.AuthProviders = append(result.AuthProviders, providerInfo{

apis/settings_test.go

@@ -76,6 +76,7 @@ func TestSettingsList(t *testing.T) {
 				`"oidc3Auth":{`,
 				`"appleAuth":{`,
 				`"instagramAuth":{`,
+				`"vkAuth":{`,
 				`"secret":"******"`,
 				`"clientSecret":"******"`,
 			},
@@ -155,6 +156,7 @@ func TestSettingsSet(t *testing.T) {
 				`"oidc3Auth":{`,
 				`"appleAuth":{`,
 				`"instagramAuth":{`,
+				`"vkAuth":{`,
 				`"secret":"******"`,
 				`"clientSecret":"******"`,
 				`"appName":"acme_test"`,
@@ -223,6 +225,7 @@ func TestSettingsSet(t *testing.T) {
 				`"oidc3Auth":{`,
 				`"appleAuth":{`,
 				`"instagramAuth":{`,
+				`"vkAuth":{`,
 				`"secret":"******"`,
 				`"clientSecret":"******"`,
 				`"appName":"update_test"`,