Develop Reference

S3 generate download link

I'm having trouble generating a download link for an html file i'm uploading to aws s3 server. I am able to generate the link and access the file. But what I want to happen is that when I click the link is for the file to be downloaded instead of opening it.
Here is and example of the url:
https://wassap_app.s3.us-east-1.amazonaws.com/report/test.html
Below is the code for the method that does the upload:
public boolean uploadFile(String name) {
try {
this.client.putObject(new PutObjectRequest(bucketName, "report/" + name, this.file)
.withCannedAcl(CannedAccessControlList.PublicRead));
String url = client.getUrl(bucketName, "report/" + name).toExternalForm();
System.out.println("################ Download File URL ################");
System.out.println(url);
System.out.println("###################################################");
return true;
} catch (AmazonServiceException ase) {
return false;
} catch (AmazonClientException ace) {
return false;
}
}

You can use the response-content-disposition query parameter as documented here. Your URL will then look like:
https://wassap_app.s3.us-east-1.amazonaws.com/report/test.html?response-content-disposition=attachment%3B%20filename%3D%22report.html%22
But the documentation also states:
You must sign the request, either using an Authorization header or a
pre-signed URL, when using these parameters. They cannot be used with
an unsigned (anonymous) request.
To sign the request for the user you can use a presigned URL. I don't have a Java environment to test right now, but something like the following should work.
GeneratePresignedUrlRequest req = new GeneratePresignedUrlRequest(bucketName, "report/" + name);
ResponseHeaderOverrides overrides = new ResponseHeaderOverrides();
overrides.setContentDisposition("attachment; filename=\"report.html\"");
req.setResponseHeaders(overrides);
URL url = this.client.generatePresignedUrl(req);
System.out.println(url);

Call this method:
String url = client.getResourceUrl(bucketName, "report/" + name);
Hope this helps!

What URL to hit to log out of Facebook through java APIs?

I am using the below code to log into Facebook. Once i get the code, using that i get access token and then query graph api and get some basic details.
#RequestMapping(value = "/fblogin")
public String inititateFBlogin(ModelMap model) {
System.out.println("in FB login ");
String fbAuthURL = fbConnectionService.getFBAuthUrl();
return "redirect:"+fbAuthURL;
}
public String getFBAuthUrl() {
String fbLoginUrl = "";
try {
fbLoginUrl = "http://www.facebook.com/dialog/oauth?" + "client_id="
+ FBConnection.FB_APP_ID + "&redirect_uri="
+ URLEncoder.encode(FBConnection.REDIRECT_URI, "UTF-8")
+ "&scope=email";
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return fbLoginUrl;
}
But to logout , i am hitting the URL in below format.
//https://www.facebook.com/logout.php?next=[YourAppURL]&access_token=[ValidAccessToken]
#RequestMapping(value = "/fblogout", method=GET)
public String fbLogOut(ModelMap model) {
String fbLogoutURL = "https://www.facebook.com/logout.php?confirm=1&next=";
String appURL = "http://localhost:15005/abc";
String accessToken = accessTokenFB ;
String logOutURL = fbLogoutURL+appURL+"&access_token="+accessToken;
return "redirect:"+logOutURL;
}
But looks like the above FB url always redirects to the FB homepage.
Is there any way that i can log out by simply calling any FB service through java, I would rather avoid going down to the javascript SDK.
Many thanks.

You can logout an access token by sending a DELETE (instead of GET/POST) request to /me/permissions
https://developers.facebook.com/docs/facebook-login/permissions/requesting-and-revoking
https://developers.facebook.com/docs/graph-api/reference/user/permissions/
curl -X DELETE https://graph.facebook.com/me/permissions?access_token=ABC

Test Java RESTful calls to Web API .Net

I have a weird question. I am working on a Java project for work, where we need to make HTTP GET/POST calls to our WEB API. I wanted to make a WebAPI testing project in C#; run it locally (localhost on some random port) and make sure I am sending the right stuff. That way I could control what was sent back(success, errors, JSON, XML, and different variables like that).
Here is some key stuff I have so far:
Client-Java code:
public String sendAPIRequest( HttpRequestMethod method, String apiURI, String payload) throws IOException
{
// Method is GET, POST....
// apiURL specific API navigating to.
// pauload is the html body.
if(payload == null)
{
payload = "";
}
// Establish a connection.
String strURL = String.format("%s%s", this.BaseURL, apiURI);
URL url = new URL(strURL);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestProperty("Accept-Charset", this.CHARSET);
conn.setRequestMethod(method.toString());
conn.setRequestProperty("Content-Type", "text/json;charset=" + this.CHARSET);
conn.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
conn.setRequestProperty("Accept","*/*");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.connect();
// write the payload out, if it exists.
//if(payload != null)
{
try(OutputStream output = conn.getOutputStream())
{
output.write(payload.getBytes(CHARSET));
}
}
// read the response.
StringBuilder response = new StringBuilder();
InputStream input = conn.getInputStream();
try(Scanner inputScanner = new Scanner(input))
{
while(inputScanner.hasNextLine())
{
response.append((inputScanner));
}
}
return response.toString();
}
public String CheckForApplicableLicenses(String dCode, String key)
{
String result;
try
{
String APICall = String.format("/license/find_matching?d_code=%s&key=%s", dCode, key);
String Response = API.sendAPIRequest(HttpRequestMethod.GET, APICall);
// TODO Parse the String Response JSON/XMl.
result = Response;
}
catch(Exception ex)
{
// TODO: incorporate some sort of logging and error handling.
result = ex.toString();
}
return result;
}
Server-C#.Net code (tested with fiddler, and in the browser):
[Route("api/[controller]")]
public class LicenseController : Controller
{
[HttpGet]
[Route("find_matching")]
public IEnumerable<string> find_matching(string d_code = "", string key = "")
{
return new string[] { d_code, key };
}
}
Results so far:
I've gotten 404 errors, and I have been able to connect. Most of the time the Java client blows up when I get to the creating the InputStream. I've never been able to trip the breakpoint in the C# server.
Questions:
1) Is what I am doing even feasible? I'm really just trying to test the Java Client, without calling the API, before I am ready. Maybe it has something to do with not running the service on the default HTTP port of 80?
2) Is there a better way of testing this? I don't want to make call to our actual service until we are done.
Thanks in advance for an assistance.

Receiving customized response and file from REST web services

I'm trying to create some REST web services with Java in order to send data, do calculations on the server, and return the result. In a first stage I send and receive information as an excel file (in the future I prefer to use XML or JSON).
Well, after a lots of hours trying it, and reading lots of posts, it seems I'm very close to achieve it, but I don't know how to obtain the final response of the server.
I have a service like this:
#GET
#Path("/test")
#Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response getFile(#QueryParam("IDfile") String IDfile) {
if(IDfile.trim().length() == 0 || IDfile == null) {
return Response.status(Response.Status.BAD_REQUEST).entity("IDfile cannot be blank").build();
}
String uploadedFileLocation = "C:\\FilesWebservice\\" + IDfile;
Boolean sortida = false;
try {
prova prueba = new prova();
sortida = prueba.prova(uploadedFileLocation); //this creates an xls file as response
} catch (Exception ex) {
System.out.println("error" + ex.toString());
Logger.getLogger(ServiceResource.class.getName()).log(Level.SEVERE, null, ex);
}
if (sortida) {
File file = new File("C:\\FilesWebservice\\out\\prediction.xls"); // the File path you want to serve.
return Response.ok(file, MediaType.APPLICATION_OCTET_STREAM)
.header("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"" ) //optional
.build();
} else
return Response.status(500).entity("It was unable to calculate (Ask God for the reason)").build();
}
It works OK, if I send a GET through the browser I receive the file in my downloads folder, but I need to consume the service with another application. Thus, I'm developing a client with Netbeans, and then, NB created automatic code according to my web service. In this case I have:
public <T> T getFile(Class<T> responseType, String IDfile) throws ClientErrorException {
WebTarget resource = webTarget;
if (IDfile != null) {
resource = resource.queryParam("IDfile", IDfile);
}
resource = resource.path("test");
Builder builder = resource.request(MediaType.APPLICATION_OCTET_STREAM_TYPE);
Invocation invocation = builder.buildGet();
return resource.request(MediaType.APPLICATION_OCTET_STREAM_TYPE).get(responseType);
}
Maybe I added some lines, I can't remember now. Anyway, the service returns a status code, a customised message and the file as attachment. I want to read at least the status code and obviously save the file, but I don't know how can I do it.
I tried to do:
MyJerseyClientAlgA client = new MyJerseyClientAlgA("192.168.1.30");
Object response = client.getFile(Response.class, "3cphkhfu.xls");
but it was unsuccessful to extract the information I need from 'response'.
Any help or ideas would be appreciated.
Many thanks in advance
EDIT:
Thanks #LutzHorn for your reply. I'm not sure if I understand well your proposal, I'll do some tests and if I find a solution I'll post under my question. Anyway, I generated again the automatic code for consuming the REST service, that is:
public <T> T getFile(Class<T> responseType, String IDfile) throws ClientErrorException {
WebTarget resource = webTarget;
if (IDfile != null) {
resource = resource.queryParam("IDfile", IDfile);
}
resource = resource.path("test");
return resource.get(responseType);
}
but I have an error in the last line, it indicates:
cannot find symbol
symbol: method get(Class)
so I changed this line for
return resource.request(MediaType.APPLICATION_OCTET_STREAM_TYPE).get(responseType);
but I'm not sure if this is right.

Well, after some hours searching and testing, this piece of code works. I don't know if it is the best solution, but it does exactly what I want: extract the status and save the file returned by the web service.
public void getFile(String IDfile) throws ClientErrorException {
WebTarget resource = webTarget;
if (IDfile != null) {
resource = resource.queryParam("IDfile", IDfile);
}
resource = resource.path("test");
Invocation inv = resource.request(MediaType.APPLICATION_OCTET_STREAM_TYPE).buildGet();
Response rp = inv.invoke();
InputStream attachment = null;
try {
if (rp.getStatus() == 200) {
attachment = rp.readEntity(InputStream.class); //This method can be invoked only once unless you buffer the response...
ReadableByteChannel rbc = Channels.newChannel(attachment); //website.openStream()
FileOutputStream fos = new FileOutputStream("C://FilesWebservice/solution.xls");
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
} else {
System.out.println(rp.getStatus());
}
} catch ( Exception ex) {
ex.printStackTrace();
} finally {
rp.close();
}
}

Having trouble implementing Stormpath form Login/Authentication alongside REST oAuth authentication in the same application

We're using stormpath with Java & also trying to combine form Login with REST API authentication on the same application.
I've setup stormpath servlet plugin as described here https://docs.stormpath.com/java/servlet-plugin/quickstart.html... This works very fine.
Now, on the same application, we have APIs where I've implemented oAuth authentication with stormpath see here http://docs.stormpath.com/guides/api-key-management/
The first request for an access-token works fine by sending Basic Base64(keyId:keySecret) in the request header and grant_type = client_credentials in the body. Access tokens are being returned nicely. However trying to authenticate subsequent requests with the header Bearer <the-obtained-access-token> does not even hit the application before
returning the following json error message...
{
"error": "invalid_client",
"error_description": "access_token is invalid."
}
This is confusing because I've set breakpoints all over the application and I'm pretty sure that the API request doesn't hit the anywhere within the application before stormpath kicks in and returns this error. And even if stormpath somehow intercepts the request before getting to the REST interface, this message doesn't make any sense to me because i'm certainly making the subsequent API calls with a valid access-token obtained from the first call to get access-token.
I have run out of ideas why this could be happening but i'm suspecting that it may have something to do with stormpath config especially with a combination
of form Login/Authentication for web views and oAuth Athentication for REST endpoints. With that said, here's what my stormpath.properties looks like. Hope this could help point at anything I may be doing wrong.
stormpath.application.href=https://api.stormpath.com/v1/applications/[app-id]
stormpath.web.filters.authr=com.app.security.AuthorizationFilter
stormpath.web.request.event.listener = com.app.security.AuthenticationListener
stormpath.web.uris./resources/**=anon
stormpath.web.uris./assets/**=anon
stormpath.web.uris./v1.0/**=anon
stormpath.web.uris./** = authc,authr
stormpath.web.uris./**/**=authc,authr
Help with this would be highly appreciated.

The problem might be related to an incorrect request.
Is it possible for you to try this code in your app?:
private boolean verify(String accessToken) throws OauthAuthenticationException {
HttpRequest request = createRequestForOauth2AuthenticatedOperation(accessToken);
AccessTokenResult result = Applications.oauthRequestAuthenticator(application)
.authenticate(request);
System.out.println(result.getAccount().getEmail() + " was successfully verified, you can allow your protect operation to continue");
return true;
}
private HttpRequest createRequestForOauth2AuthenticatedOperation(String token) {
try {
Map<String, String[]> headers = new LinkedHashMap<String, String[]>();
headers.put("Accept", new String[]{"application/json"});
headers.put("Authorization", new String[]{"Bearer " + token});
HttpRequest request = HttpRequests.method(HttpMethod.GET)
.headers(headers)
.build();
return request;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

I've prepared an example that demonstrates oauth token creation as well as authorized access to protected pages using access tokens.
It builds off of the servlet example in the Stormpath SDK. The repo can be found here: https://github.com/stormpath/stormpath-java-oauth-servlet-sample
It demonstrates running a servlet application and having an out-of-band program get and use oauth tokens to access protected resources.
The core of the oauth part is in TokenAuthTest.java:
public class TokenAuthTest {
public static void main(String[] args) throws Exception {
String command = System.getProperty("command");
if (command == null || !("getToken".equals(command) || "getPage".equals(command))) {
System.err.println("Must supply a command:");
System.err.println("\t-Dcommand=getToken OR");
System.err.println("\t-Dcommand=getPage OR");
System.exit(1);
}
if ("getToken".equals(command)) {
getToken();
} else {
getPage();
}
}
private static final String APP_URL = "http://localhost:8080";
private static final String OAUTH_URI = "/oauth/token";
private static final String PROTECTED_URI = "/dashboard";
private static void getToken() throws Exception {
String username = System.getProperty("username");
String password = System.getProperty("password");
if (username == null || password == null) {
System.err.println("Must supply -Dusername=<username> -Dpassword=<password> on the command line");
System.exit(1);
}
PostMethod method = new PostMethod(APP_URL + OAUTH_URI);
method.setRequestHeader("Origin", APP_URL);
method.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
method.addParameter("grant_type", "password");
method.addParameter("username", username);
method.addParameter("password", password);
HttpClient client = new HttpClient();
client.executeMethod(method);
BufferedReader br = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream()));
String readLine;
while(((readLine = br.readLine()) != null)) {
System.out.println(readLine);
}
}
private static void getPage() throws Exception {
String token = System.getProperty("token");
if (token == null) {
System.err.println("Must supply -Dtoken=<access token> on the command line");
System.exit(1);
}
GetMethod method = new GetMethod(APP_URL + PROTECTED_URI);
HttpClient client = new HttpClient();
System.out.println("Attempting to retrieve " + PROTECTED_URI + " without token...");
int returnCode = client.executeMethod(method);
System.out.println("return code: " + returnCode);
System.out.println();
System.out.println("Attempting to retrieve " + PROTECTED_URI + " with token...");
method.addRequestHeader("Authorization", "Bearer " + token);
returnCode = client.executeMethod(method);
System.out.println("return code: " + returnCode);
}
}