/
OAuth2AccessTokenManager.java
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/
OAuth2AccessTokenManager.java
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package de.rheinfabrik.heimdall;
import java.util.Calendar;
import de.rheinfabrik.heimdall.grants.OAuth2Grant;
import de.rheinfabrik.heimdall.grants.OAuth2RefreshAccessTokenGrant;
import rx.Single;
import static rx.Single.error;
/**
* The all-seeing and all-hearing guardian sentry of your application who
* stands on the rainbow bridge to handle all your access tokens needs!
*
* @param <TAccessToken> The token type.
*/
public class OAuth2AccessTokenManager<TAccessToken extends OAuth2AccessToken> {
// Members
private final OAuth2AccessTokenStorage<TAccessToken> mStorage;
private Single<TAccessToken> mTokenSingle;
// Constructor
/**
* The designated constructor.
*
* @param storage The OAuth2AccessTokenStorage used to store and retrieve the access token.
*/
public OAuth2AccessTokenManager(OAuth2AccessTokenStorage<TAccessToken> storage) {
super();
if (storage == null) {
throw new IllegalArgumentException("Storage MUST NOT be null.");
}
mStorage = storage;
}
// Public API
/**
* Returns the underlying storage.
*
* @return - An OAuth2AccessTokenStorage.
*/
public OAuth2AccessTokenStorage<TAccessToken> getStorage() {
return mStorage;
}
/**
* Grants a new access token using the given OAuth2 grant.
*
* @param grant A class implementing the OAuth2Grant interface.
* @return - An observable emitting the granted access token.
*/
public Single<TAccessToken> grantNewAccessToken(OAuth2Grant<TAccessToken> grant) {
return grantNewAccessToken(grant, Calendar.getInstance());
}
/**
* Grants a new access token using the given OAuth2 grant.
*
* @param grant A class implementing the OAuth2Grant interface.
* @param calendar A calendar instance used to calculate the expiration date of the token.
* @return - An observable emitting the granted access token.
*/
public Single<TAccessToken> grantNewAccessToken(OAuth2Grant<TAccessToken> grant, Calendar calendar) {
if (grant == null) {
throw new IllegalArgumentException("Grant MUST NOT be null.");
}
if (mTokenSingle == null) {
mTokenSingle = grant
.grantNewAccessToken()
.doOnSuccess(accessToken -> {
if (accessToken.expiresIn != null) {
Calendar expirationDate = (Calendar) calendar.clone();
expirationDate.add(Calendar.SECOND, accessToken.expiresIn);
accessToken.expirationDate = expirationDate;
}
mStorage.storeAccessToken(accessToken);
mTokenSingle = null;
}).toObservable().cache().toSingle();
}
return mTokenSingle;
}
/**
* Returns an Observable emitting an unexpired access token.
* NOTE: In order to work, Heimdall needs an access token which has a refresh_token and an
* expires_in field.
*
* @param refreshAccessTokenGrant The refresh grant that will be used if the access token is expired.
* @return - An Observable emitting an unexpired access token.
*/
public Single<TAccessToken> getValidAccessToken(final OAuth2RefreshAccessTokenGrant<TAccessToken> refreshAccessTokenGrant) {
if (refreshAccessTokenGrant == null) {
throw new IllegalArgumentException("RefreshAccessTokenGrant MUST NOT be null.");
}
return mStorage.getStoredAccessToken()
.flatMap(accessToken -> {
if (accessToken == null) {
return error(new IllegalStateException("No access token found."));
} else if (accessToken.isExpired()) {
refreshAccessTokenGrant.refreshToken = accessToken.refreshToken;
return grantNewAccessToken(refreshAccessTokenGrant);
} else {
return Single.just(accessToken);
}
});
}
}