How to download issue attachments via API using OAuth

Question

I used the following API to get issue details:

https://eanand1886.atlassian.net/rest/api/2/issue/10000

which provides the following attachment URL:
https://eanand1886.atlassian.net/secure/attachment/10000/failure-smiley.png

Code that i tried:

public static void makeHttpGet(){
CloseableHttpClient httpclient = HttpClients.createDefault();
try{
String url = "https://eanand1886.atlassian.net/secure/attachment/10000/failure-smiley.png";
String accessToken = "***********************";
HttpGet get = new HttpGet(url);
get.setHeader("oauth_signature", CONSUMER_PRIVATE_KEY);
get.setHeader("oauth_token", accessToken);
get.setHeader("oauth_consumer_key", "********");
get.setHeader("oauth_signature_method", "RSA-SHA1");
get.setHeader("oauth_timestamp", ""+System.currentTimeMillis());
get.setHeader("oauth_nonce", "abcd"+System.currentTimeMillis());
get.setHeader("oauth_version", "1.0");
System.out.println("URL:"+url);
CloseableHttpResponse response = httpclient.execute(get);
int status = response.getStatusLine().getStatusCode();
System.out.println("code:"+status);
System.out.println(response);
if (status >=200 && status < 300) {
	HttpEntity entity = response.getEntity();
	if (entity.isStreaming())
	{ 
		System.out.println("Streaming..."); 
		byte data[] = EntityUtils.toByteArray(entity); 
		FileOutputStream fout = new FileOutputStream(new File("failure.png"));
		fout.write(data);
		fout.close();
		System.out.println("Done!!"); 
	}
}
}catch(Exception e)
{ e.printStackTrace(); }
}

The above code downloads a file with the login page content i.e. it redirects to login page instead of downloading the actual file.

However it works when i trigger a request with basic authentication(username:pass) in header, instead of Oauth.-Anand

ragipally alekya · Answer

This works, check it out

@GetMapping(value = "/getAttachment")
public String getAttachment(@RequestParam("id") String attachmentID) throws Exception {
System.out.println("Entered"); 
Client client = Client.create();

WebResource webResource = client.resource(jiraBaseURLRest + "attachment/" +
attachmentID);

ClientResponse response = webResource.header("Authorization", "Basic " +
base64Creds).type("application/json")
.accept("application/json").get(ClientResponse.class);

String result = response.getEntity(String.class); 
JSONObject jsonObj = new JSONObject(result);
System.out.println("JSON Object = "+jsonObj);
URL url = new URL(jsonObj.getString("content"));

Closeable httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(url.toURI());
httpGet.setHeader("Authorization", "Basic " + base64Creds);
CloseableHttpResponse response1 = ((CloseableHttpClient) httpclient).execute(httpGet);

if(response1.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = response1.getEntity();
if (entity.isStreaming())
{ 
System.out.println("Streaming..."); 
byte data[] = EntityUtils.toByteArray(entity); 
FileOutputStream fout = new FileOutputStream(new File("D://pdf1.pdf"));
fout.write(data);
fout.close();
System.out.println("Done!!"); 
}
}

return "Success";
}

Anand Elumalai1 · Answer

Hi Kevin,

Try the following code for basic authetication

public static void makeBasicAuth(){
		try{
			HttpClient hc = new HttpClient();
			String url = "https://domain.atlassian.net/secure/attachment/10000/file.png";
			GetMethod get = new GetMethod(url);
			BASE64Encoder base64encoder = new BASE64Encoder();
			byte[] b = "username:password".getBytes();
			String cp = base64encoder.encode(b);
			get.setRequestHeader("Authorization", "Basic "+cp);
			int code = hc.executeMethod(get);
			System.out.println("Code:"+code);
			InputStream is = get.getResponseBodyAsStream();
			if(is!=null && code >=200 && code <= 300){
				FileOutputStream fout = new FileOutputStream(new File("file.png"));
				int read = 0;
                byte[] bytes = new byte[1024];
                while ((read = is.read(bytes)) != -1) {
                	fout.write(bytes, 0, read);
                }
			}else{
				System.out.println("Download failed");
			}
		}catch(Exception e){
			e.printStackTrace();
		}
}

-Anand

Kevin Mauriello · Answer

I am having the same issue, but with basic authentication.  How are you connecting with basic auth and downloading the file?