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POHow can I send a message to a device using C2DM from a server that has been authenticated with OAuth2?
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copied!<p>I'm developing the server part of a system that has to send messages to a device. This was working fine with the GoogleLogin method, but I want to migrate it to OAuth 2.0 since the other authentication method has been deprecated.</p> <p>In the Google API console I created a project and then I created a key for a service account.</p> <p>This is the code I'm using to authenticate the server:</p> <pre><code>public boolean authenticateServer(){ try { File privateKey = new File(getClass().getResource("/something-privatekey.p12").toURI()); GoogleCredential cred = new GoogleCredential.Builder().setTransport(new NetHttpTransport()) .setJsonFactory(new JacksonFactory()) .setServiceAccountId("something@developer.gserviceaccount.com") .setServiceAccountScopes("https://android.apis.google.com/c2dm") .setServiceAccountPrivateKeyFromP12File(privateKey) .addRefreshListener(this) .build(); boolean success = cred.refreshToken(); this.credential = cred; return success; } catch (Exception ex) { //handle this } return false; } </code></pre> <p>When I execute this, the method <code>onTokenResponse</code> gets called and I get an <code>access_token</code> with <code>token_type</code> "Bearer" expiring in 3600 seconds. So far, so good.</p> <p>This is the code I'm using to send the message to the device, which is always giving me a 401 status (not authorized). Any ideas?</p> <pre><code>private static String UTF8 = "UTF-8"; public void sendMessage(String text, String registrationId) { try { StringBuilder postDataBuilder = new StringBuilder(); postDataBuilder .append("registration_id") .append("=") .append(registrationId); postDataBuilder.append("&") .append("collapse_key") .append("=") .append("0"); postDataBuilder.append("&") .append("data.payload") .append("=") .append(URLEncoder.encode(text, UTF8)); byte[] postData = postDataBuilder.toString().getBytes(UTF8); URL url = new URL("https://android.apis.google.com/c2dm/send"); HostnameVerifier hVerifier = new HostnameVerifier() { public boolean verify(String hostname, SSLSession session) { return true; } }; HttpsURLConnection conn = (HttpsURLConnection) url.openConnection(); conn.setHostnameVerifier(hVerifier); conn.setDoOutput(true); conn.setUseCaches(false); conn.setRequestMethod("POST"); conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty( "Content-Length", Integer.toString(postData.length)); conn.setRequestProperty( "Authorization", "Bearer " + credential.getAccessToken()); OutputStream out = conn.getOutputStream(); out.write(postData); out.close(); int sw = conn.getResponseCode(); System.out.println("" + sw); } catch (IOException ex){ //handle this } } </code></pre> <p>Thanks!</p>

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