de.sonallux.spotify.api.authorization.client_credentials.ClientCredentialsFlow Maven / Gradle / Ivy

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A Java wrapper for Spotify's Web API

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package de.sonallux.spotify.api.authorization.client_credentials;

import de.sonallux.spotify.api.SpotifyApiException;
import de.sonallux.spotify.api.authorization.InMemoryTokenStore;
import de.sonallux.spotify.api.authorization.SpotifyAuthorizationException;
import de.sonallux.spotify.api.authorization.TokenStore;
import de.sonallux.spotify.api.authorization.TokenStoreApiAuthorizationProvider;
import de.sonallux.spotify.api.http.ApiClient;
import okhttp3.HttpUrl;

import java.util.Base64;

/**
 * Implements the
 * 
 * Client Credentials Flow
 */
public class ClientCredentialsFlow extends TokenStoreApiAuthorizationProvider {
    private final String clientId;
    private final String clientSecret;
    private final AuthorizationTokenApi tokenApi;

    ClientCredentialsFlow(String clientId, String clientSecret, TokenStore tokenStore, HttpUrl tokenApiBaseUrl) {
        super(tokenStore);
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        var apiClient = createApiClient(tokenApiBaseUrl);
        this.tokenApi = new AuthorizationTokenApi(apiClient);
    }

    public ClientCredentialsFlow(String clientId, String clientSecret) {
        this(clientId, clientSecret, new InMemoryTokenStore(), AuthorizationTokenApi.BASE_URL);
    }

    private static ApiClient createApiClient(HttpUrl tokenApiBaseUrl) {
        return ApiClient.builder()
            .baseUrl(tokenApiBaseUrl)
            .build();
    }

    public void authorize() throws SpotifyAuthorizationException {
        var authTokensCall = tokenApi.getAuthTokens(createTokensCallAuthHeader(), "client_credentials");
        try {
            var authTokens = authTokensCall.execute();
            tokenStore.storeTokens(authTokens);
        }
        catch (SpotifyApiException e) {
            throw new SpotifyAuthorizationException("Failed to get auth tokens", e);
        }
    }

    private String createTokensCallAuthHeader() {
        var clientInfo = clientId + ":" + clientSecret;
        var base64ClientInfo = Base64.getEncoder().encodeToString(clientInfo.getBytes());
        return "Basic " + base64ClientInfo;
    }
}