I am using SignedURL to upload file directly to Cloud Storage ( using
com.google.cloud.storage Client library) without going through App Engine
instances. The Process I am following is :
Creating a empty Object and generating a SignedURL for that Object :
Storage storage = null;
try{
FileInputStream credentialsStream = new FileInputStream("JSONFile");
Credentials credentials = GoogleCredentials.fromStream(credentialsStream);
storage = StorageOptions.newBuilder().setCredentials(credentials).build().
getService();
}catch(IOException e) {
e.printStackTrace();
}
Acl aclObject = Acl.of(User.ofAllUsers(),Role.OWNER);
List<Acl> aclAccess = new ArrayList<>();
aclAccess.add(aclObject);
//BucketName and User name are Strings.
BlobId blobId = BlobId.of(BUCKET_NAME,USER_NAME+"TeamLogo");
BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setAcl(aclAccess).
setContentType("image/jpeg").build();
Blob blob = storage.create(blobInfo);
By now , An Empty Object is created in Cloud Storage
[image: Screenshot (3).png]
I am generating a signedURL for this Empty Object such that when user
uploads a file , the Content of the file replaces the Empty object .
HttpMethod httpMethod = HttpMethod.PUT;
ServiceAccountSigner signer = ServiceAccountCredentials.newBuilder().
setClientId(CLIENT_ID).setClientEmail(CLIENT_EMAIL).setPrivateKey(PRIVATEKEY
).setPrivateKeyId(PRIVATE_KEY_ID).build()
URL url = blob.signUrl(10,TimeUnit.MINUTES,Storage.SignUrlOption.
httpMethod(httpMethod),Storage.SignUrlOption.signWith(signer),Storage.
SignUrlOption.withContentType());
return url;
My HTML code to handle the Upload of the File
<form action="${signedURL}" method="put" enctype="multipart/form-data">
<label>Enter Your User Name</label><br>
<input type="text" name="UserName" ><br><br>
<label>Enter Your Team Name</label><br>
<input type="text" name="TeamName" ><br><br>
<label>Upload Team Logo</label><br>
<input type="file" name="myFile" required="required"><br><br>
<input type="submit" value="Create Team">
<input type="hidden" name="success_action_redirect" value=
"http://localhost:8080/register";>
</form>
After selecting the file and Clicking on Upload, the file I selected is not
uploaded to Cloud Storage and it is loading this page ( A white page with a
URL).
[image: Screenshot (2).png]
I am not achieving my desired result. What I am missing in my Code ? Java
Documentation for Cloud Storage doesn't offer full picture for newbies like
me. Someone please help me in this regard.
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