doesn't work with Twitch

[n0xena]

Code example

import com.google.api.client.auth.oauth2.AuthorizationCodeFlow;
import com.google.api.client.auth.oauth2.BearerToken;
import com.google.api.client.auth.oauth2.ClientParametersAuthentication;
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.util.store.DataStoreFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.youtube.YouTubeScopes;
import java.awt.Desktop;
import java.io.File;
import java.net.URI;
import java.util.Arrays;
import java.util.Collection;
import java.util.Properties;
public final class Auth
{
	public final static void main(final String... args) throws Exception
	{
		Properties properties=new Properties();
		properties.load(Auth.class.getResourceAsStream("/oauth/twitch.properties"));
		HttpTransport httpTransport=new NetHttpTransport();
		JsonFactory jsonFactory=new JacksonFactory();
		GenericUrl tokenUrl=new GenericUrl(properties.getProperty("tokenUrl"));
		ClientParametersAuthentication clientParametersAuthentication=new ClientParametersAuthentication(properties.getProperty("clientId"), properties.getProperty("clientSecret"));
		DataStoreFactory dataStoreFactory=new FileDataStoreFactory(new File("D:/data/java/oauth"));
		Collection<String> scopes=Arrays.asList("analytics:read:extensions",
			"analytics:read:games",
			"bits:read",
			"channel:edit:commercial",
			"channel:read:hype_train",
			"channel:read:subscriptions",
			"clips:edit",
			"user:edit",
			"user:edit:broadcast",
			"user:edit:follows",
			"user:read:broadcast",
			"user:read:email",
			"channel:read:stream_key",
			"channel_check_subscription",
			"channel_commercial",
			"channel_editor",
			"channel_feed_edit",
			"channel_feed_read",
			"channel_read",
			"channel_stream",
			"channel_subscriptions",
			"collections_edit",
			"communities_edit",
			"communities_moderate",
			"openid",
			"user_blocks_edit",
			"user_blocks_read",
			"user_follows_edit",
			"user_read",
			"user_subscriptions",
			"viewing_activity_read",
			"channel:moderate",
			"chat:edit",
			"chat:read",
			"whispers:read",
			"whispers:edit");
		AuthorizationCodeFlow authorizationCodeFlow=(new AuthorizationCodeFlow.Builder(BearerToken.authorizationHeaderAccessMethod(), httpTransport, jsonFactory, tokenUrl, clientParametersAuthentication, properties.getProperty("clientId"), properties.getProperty("authUrl"))).setDataStoreFactory(dataStoreFactory).setScopes(scopes).build();
		Desktop.getDesktop().browse(new URI(authorizationCodeFlow.newAuthorizationUrl().setRedirectUri("callback uri").build()));
		Credential credential=authorizationCodeFlow.createAndStoreCredential(authorizationCodeFlow.newTokenRequest(System.console().readLine("authCode: ")).setRedirectUri("callback uri").execute(), "twitch");
	}
}

clientId=client-id
clientSecret=client-secret
authUrl=https://id.twitch.tv/oauth2/authorize
tokenUrl=https://id.twitch.tv/oauth2/token

Stack trace

Exception in thread "main" java.lang.IllegalArgumentException: key scope
        at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:900)
        at com.google.api.client.json.JsonParser.parse(JsonParser.java:360)
        at com.google.api.client.json.JsonParser.parse(JsonParser.java:335)
        at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:79)
        at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:73)
        at com.google.api.client.http.HttpResponse.parseAs(HttpResponse.java:449)
        at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:346)
        at de.cryptearth.twitch.Auth.main(Auth.java:69)
Caused by: java.lang.IllegalArgumentException: key scope, field private java.lang.String com.google.api.client.auth.oauth2.TokenResponse.scope
        at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:900)
        at com.google.api.client.json.JsonParser.parse(JsonParser.java:451)
        at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:787)
        ... 7 more
Caused by: java.lang.IllegalArgumentException: expected collection or array type but got class java.lang.String
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:164)
        at com.google.api.client.util.Preconditions.checkArgument(Preconditions.java:67)
        at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:724)
        ... 9 more

External references such as API reference guides

https://dev.twitch.tv/docs/authentication/getting-tokens-oauth#oauth-authorization-code-flow

possible issue: twitch returns scope as array with one string contain scopes split by spaces - hence maybe bad json reply from twitch

[n0xena]

as noted on twitchdev/issue#164
according to rfc https://tools.ietf.org/html/rfc6749#section-3.3 the issue is caused by twitch not conforming to rfc as the scope parameter in the token response has to consist only of one string contain the scopes as a space separated list
twitch is violating this rfc by wrapping this string within an additional array - hence closing this issue as it's not a fault of google
sorry for wasting anyones time here