Allow device to query their currently stored signed prekey.

src/main/java/org/whispersystems/textsecuregcm/controllers/KeysControllerV2.java

@@ -83,16 +83,6 @@ public class KeysControllerV2 extends KeysController {
     keys.store(account.getNumber(), device.getId(), preKeys.getPreKeys(), preKeys.getLastResortKey());
   }
 
-  @Timed
-  @PUT
-  @Path("/signed")
-  @Consumes(MediaType.APPLICATION_JSON)
-  public void setSignedKey(@Auth Account account, @Valid SignedPreKey signedPreKey) {
-    Device device = account.getAuthenticatedDevice().get();
-    device.setSignedPreKey(signedPreKey);
-    accounts.update(account);
-  }
-
   @Timed
   @GET
   @Path("/{number}/{device_id}")
@@ -142,6 +132,25 @@ public class KeysControllerV2 extends KeysController {
     }
   }
 
-
+  @Timed
-
+  @PUT
+  @Path("/signed")
+  @Consumes(MediaType.APPLICATION_JSON)
+  public void setSignedKey(@Auth Account account, @Valid SignedPreKey signedPreKey) {
+    Device device = account.getAuthenticatedDevice().get();
+    device.setSignedPreKey(signedPreKey);
+    accounts.update(account);
+  }
+
+  @Timed
+  @GET
+  @Path("/signed")
+  @Produces(MediaType.APPLICATION_JSON)
+  public Optional<SignedPreKey> getSignedKey(@Auth Account account) {
+    Device       device       = account.getAuthenticatedDevice().get();
+    SignedPreKey signedPreKey = device.getSignedPreKey();
+
+    if (signedPreKey != null) return Optional.of(signedPreKey);
+    else                      return Optional.absent();
+  }
 }

src/test/java/org/whispersystems/textsecuregcm/tests/controllers/KeyControllerTest.java

@@ -154,6 +154,28 @@ public class KeyControllerTest {
     verify(keys).getCount(eq(AuthHelper.VALID_NUMBER), eq(1L));
   }
 
+  @Test
+  public void getSignedPreKeyV2() throws Exception {
+    SignedPreKey result = resources.client().resource("/v2/keys/signed")
+                                   .header("Authorization", AuthHelper.getAuthHeader(AuthHelper.VALID_NUMBER, AuthHelper.VALID_PASSWORD))
+                                   .get(SignedPreKey.class);
+
+    assertThat(result.equals(SAMPLE_SIGNED_KEY));
+  }
+
+  @Test
+  public void putSignedPreKeyV2() throws Exception {
+    SignedPreKey   test     = new SignedPreKey(9999, "fooozzz", "baaarzzz");
+    ClientResponse response = resources.client().resource("/v2/keys/signed")
+                                       .header("Authorization", AuthHelper.getAuthHeader(AuthHelper.VALID_NUMBER, AuthHelper.VALID_PASSWORD))
+                                       .type(MediaType.APPLICATION_JSON_TYPE)
+                                       .put(ClientResponse.class, test);
+
+    assertThat(response.getStatus() == 204);
+
+    verify(AuthHelper.VALID_DEVICE).setSignedPreKey(eq(test));
+    verify(accounts).update(eq(AuthHelper.VALID_ACCOUNT));
+  }
 
   @Test
   public void validLegacyRequestTest() throws Exception {