I'm having tremendous problems trying to upload a file to the Google Cloud Storage (GCS) using a form on a webpage hosted on a Google App Engine (GAE), GWT, using POST OBJECT and a policy document and signature.
The biggest problems of all; I don't get any feedback on what is wrong.
First of all. I am able to upload a file to the GCS if I use no Policy or Signature at all, so I'm assuming the error lies in the that part. See below for code.
//Is used to get the policy as base64 and the signature (and converted to base64)
public String[] getPolicyAndSignature(String policy)
{
try
{
KeyStore keystore = KeyStore.getInstance("PKCS12");
keystore.load(new FileInputStream(new File("my_test_app/mykey.p12")), "notasecret".toCharArray());
PrivateKey privateKey = (PrivateKey)keystore.getKey("privatekey", "notasecret".toCharArray());
Signature signature = Signature.getInstance("SHA256withRSA");
signature.initSign(privateKey);
//is this wrong, should it be just: (?)
//signature.update(policy.getBytes())
signature.update(Base64Utils.toBase64(policy.getBytes()).getBytes());
byte[] signatureBytes = signature.sign();
byte[] policyBytes = policy.getBytes();
return new String[]{Base64Utils.toBase64(policyBytes), Base64Utils.toBase64(signatureBytes)};
}
catch(Exception e)
{
System.out.println("Error: " + e.getMessage());
}
return null;
}
This is the code that uses that function:
public TestUploader()
{
VerticalPanel mainPanel = new VerticalPanel();
final FormPanel formPanel = new FormPanel();
formPanel.setWidget(mainPanel);
FileUpload upload = new FileUpload();
upload.setName("file");
formPanel.setAction("http://sgacms.storage.googleapis.com");
formPanel.setMethod(FormPanel.METHOD_POST);
formPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
formPanel.getElement().setAttribute("accept-charset", "UTF-8");
String keyString = "testing";
String bucketString = "sgacms";
Hidden key = new Hidden("key", keyString);
Hidden bucket = new Hidden("bucket", bucketString);
Hidden contentType = new Hidden("Content-Type", "image/jpeg");
Hidden GoogleAccessID = new Hidden("GoogleAccessID", "517031602192-p8kn8m33vhmhg9horbif8mansmkilqle@developer.gserviceaccount.com");
Hidden acl = new Hidden("acl", "bucket-owner-read");
final Hidden policy = new Hidden("policy");
final Hidden hiddenSignature = new Hidden("signature");
String policyString =
"{\"expiration\":\"2016-06-16T11:11:11Z\","+
"\"conditions\":["+
"[\"starts-with\",\"$key\",\"\"],"+
"{\"acl\":\"bucket-owner-read\"},"+
"{\"bucket\":\"sgacms\"},"+
"[\"eq\",\"$Content-Type\",\"image/jpeg\"],"+
"[\"content-length-range\",0,1000000]"+
"]"+
"}";
String[] policyAndSignature = getPolicyAndSignature(policyString);
policy.setValue(policyAndSignature[0]);
hiddenSignature.setValue(policyAndSignature[1]);
Button btn = new Button("Submit");
mainPanel.add(btn); //submit
mainPanel.add(key); //hidden
mainPanel.add(bucket); //hidden
mainPanel.add(contentType); //hidden
mainPanel.add(GoogleAccessID); //hidden
mainPanel.add(acl); //hidden
mainPanel.add(policy); //hidden
mainPanel.add(hiddenSignature); //hidden
mainPanel.add(upload); //file
initWidget(formPanel);
btn.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
formPanel.submit();
}
});
formPanel.addSubmitCompleteHandler(new SubmitCompleteHandler() {
@Override
public void onSubmitComplete(SubmitCompleteEvent event) {
log.severe("Submit results: " + event.getResults());
}
});
}
The submit results simply prints: null, when I fail. And since I never succeed it never prints anything else. If I on the other hand uses no policy and no signature (in other words making an anonymous upload) the submit results will be empty and the file will be uploaded successfully.
So I can't figure out what is wrong! Any help is appreciated! Thank you!
EDIT:
So now I've finally been able to get an error response which says the following:
"SignatureDoesNotMatch: The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method"