Hi,
Here's the full example of a method which uploads an image into an existing
album in Picasa Web Albums. Feel free to share it!
Cheers,
Gizmo
public static String upload(String fullpathToImage)
{
//The url of the image
String resultingURL = new String();
try
{
// These are not needed
String GOOGLE_APP_NAME = "TralhasVariasScanPoster";
String GOOGLE_REFRESH_TOKEN = "";
String GOOGLE_ACCESS_TOKEN = "";
HttpTransport httpTransport = new NetHttpTransport();
JsonFactory jsonFactory = new JacksonFactory();
TokenResponse tokenResponse = new TokenResponse();
//Check of we have a previous Refresh Token cached
if (Config.GOOGLE_OAUTH_REFRESH_TOKEN.length() == 0)
{
//No Google OAuth2 Key has been previously cached
//Request the user to grant access to the Picasa Resource
(uses the Google Authentication servers)
AuthorizationCodeFlow.Builder codeFlowBuilder =
new
GoogleAuthorizationCodeFlow.Builder(httpTransport,
jsonFactory,
Config.GOOGLE_CLIENT_ID,
Config.GOOGLE_CLIENT_SECRET,
Arrays.asList(Config.GOOGLE_SCOPE_PICASA));
AuthorizationCodeFlow codeFlow = codeFlowBuilder.build();
AuthorizationCodeRequestUrl authorizationUrl =
codeFlow.newAuthorizationUrl();
authorizationUrl.setRedirectUri(Config.GOOGLE_REDIRECT_URI);
System.out.println("Go to the following address:\n" +
authorizationUrl);
System.out.println("What is the 'code' url parameter?");
String code = new Scanner(System.in).nextLine();
//Use the code returned by the Google Authentication Server
to generate an Access Code
AuthorizationCodeTokenRequest tokenRequest =
codeFlow.newTokenRequest(code);
tokenRequest.setRedirectUri(Config.GOOGLE_REDIRECT_URI);
tokenResponse = tokenRequest.execute();
GOOGLE_REFRESH_TOKEN = tokenResponse.getRefreshToken();
GOOGLE_ACCESS_TOKEN = tokenResponse.getAccessToken();
//Store the Refresh Token for later usage (this avoid
having to request the user to
//Grant access to the application via the webbrowser again
saveTextFile(Config.GOOGLE_OAUTH_REFRESH_TOKEN_FILE,
GOOGLE_REFRESH_TOKEN);
}
else
{
//There is a Google OAuth2 Key cached previously.
//Use the refresh token to get a new Access Token
//Get the cached Refresh Token
GOOGLE_REFRESH_TOKEN = new
String(Config.GOOGLE_OAUTH_REFRESH_TOKEN);
//Now we need to get a new Access Token using our
previously cached Refresh Token
RefreshTokenRequest refreshTokenRequest = new
RefreshTokenRequest(httpTransport,
jsonFactory,
new
GenericUrl(Config.GOOGLE_TOKEN_SERVER_URL),
GOOGLE_REFRESH_TOKEN);
refreshTokenRequest.setClientAuthentication(new
BasicAuthentication(Config.GOOGLE_CLIENT_ID, Config.GOOGLE_CLIENT_SECRET));
refreshTokenRequest.setScopes(Arrays.asList(Config.GOOGLE_SCOPE_PICASA));
tokenResponse = refreshTokenRequest.execute();
//Get and set the Refresn the Access Tokens
GOOGLE_ACCESS_TOKEN = new
String(tokenResponse.getAccessToken());
}
//At this point we have a valid Google Access Token
//Let us access Picasa then!
GoogleCredential credential = new GoogleCredential.Builder()
.setClientSecrets(Config.GOOGLE_CLIENT_ID,
Config.GOOGLE_CLIENT_SECRET)
.setJsonFactory(jsonFactory)
.setTransport(httpTransport)
.build()
.setAccessToken(GOOGLE_ACCESS_TOKEN)
.setRefreshToken(GOOGLE_REFRESH_TOKEN);
PicasawebService picasaWebSvc = new
PicasawebService("GOOGLE_APP_NAME");
picasaWebSvc.setOAuth2Credentials(credential);
URL feedUrl = new
URL("https://picasaweb.google.com/data/feed/api/user/"; +
Config.PICASAWEB_LOGIN + "/albumid/" + Config.PICASAWEB_ALBUM_ID);
MediaFileSource myMedia = new MediaFileSource(new
File(fullpathToImage), "image/jpeg");
PhotoEntry returnedPhoto = picasaWebSvc.insert(feedUrl,
PhotoEntry.class, myMedia);
resultingURL = returnedPhoto.getMediaContents().get(0).getUrl();
if (resultingURL.toLowerCase().contains("please check your
firewall") || resultingURL.toLowerCase().contains("error"))
{
throw new Exception("The Windows Firewall seems to be
blocking the upload...");
}
System.out.println("...DONE!");
System.out.println("Cover page URL: " + resultingURL);
}
catch (Exception e)
{
System.err.println("[BloggerImageUploader.java]: There was an
error: " + e.getMessage());
return "";
}
//The result
return resultingURL;
}
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