Support for verification tokens

// FREEBIE

java/src/main/java/org/whispersystems/textsecure/api/TextSecureAccountManager.java

@@ -235,6 +235,10 @@ public class TextSecureAccountManager {
     return activeTokens;
   }
 
+  public String getAccountVerificationToken() throws IOException {
+    return this.pushServiceSocket.getAccountVerificationToken();
+  }
+
   public String getNewDeviceVerificationCode() throws IOException {
     return this.pushServiceSocket.getNewDeviceVerificationCode();
   }

java/src/main/java/org/whispersystems/textsecure/internal/push/AuthorizationToken.java

@@ -0,0 +1,13 @@
+package org.whispersystems.textsecure.internal.push;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class AuthorizationToken {
+
+  @JsonProperty
+  private String token;
+
+  public String getToken() {
+    return token;
+  }
+}

java/src/main/java/org/whispersystems/textsecure/internal/push/PushServiceSocket.java

@@ -82,6 +82,7 @@ public class PushServiceSocket {
   private static final String VERIFY_ACCOUNT_CODE_PATH  = "/v1/accounts/code/%s";
   private static final String VERIFY_ACCOUNT_TOKEN_PATH = "/v1/accounts/token/%s";
   private static final String REGISTER_GCM_PATH         = "/v1/accounts/gcm/";
+  private static final String REQUEST_TOKEN_PATH        = "/v1/accounts/token";
 
   private static final String PREKEY_METADATA_PATH      = "/v2/keys/";
   private static final String PREKEY_PATH               = "/v2/keys/%s";
@@ -135,6 +136,11 @@ public class PushServiceSocket {
                 "PUT", JsonUtil.toJson(signalingKeyEntity));
   }
 
+  public String getAccountVerificationToken() throws IOException {
+    String responseText = makeRequest(REQUEST_TOKEN_PATH, "GET", null);
+    return JsonUtil.fromJson(responseText, AuthorizationToken.class).getToken();
+  }
+
   public String getNewDeviceVerificationCode() throws IOException {
     String responseText = makeRequest(PROVISIONING_CODE_PATH, "GET", null);
     return JsonUtil.fromJson(responseText, DeviceCode.class).getVerificationCode();