Add textsecure.refreshKeys

This helper checks the server for the number of remaining prekeys, then
generates more if there are fewer than 10 remaining.

// FREEBIE

js/libtextsecure.js

@@ -38913,6 +38913,14 @@ textsecure.processDecrypted = function(decrypted, source) {
     });
 };
 
+window.textsecure.refreshPreKeys = function() {
+    return textsecure.api.getMyKeys().then(function(preKeyCount) {
+        if (preKeyCount < 10) {
+            generateKeys();
+        }
+    });
+};
+
 function createAccount(number, verificationCode, identityKeyPair, single_device) {
     textsecure.storage.put('identityKey', identityKeyPair);
 
@@ -39331,6 +39339,16 @@ window.textsecure.api = function () {
         });
     };
 
+    self.getMyKeys = function(number, deviceId) {
+        return doAjax({
+            call                : 'keys',
+            httpType            : 'GET',
+            do_auth             : true,
+        }).then(function(res) {
+            return parseInt(res.count);
+        });
+    };
+
     self.getKeysForNumber = function(number, deviceId) {
         if (deviceId === undefined)
             deviceId = "*";

libtextsecure/api.js

@@ -216,6 +216,16 @@ window.textsecure.api = function () {
         });
     };
 
+    self.getMyKeys = function(number, deviceId) {
+        return doAjax({
+            call                : 'keys',
+            httpType            : 'GET',
+            do_auth             : true,
+        }).then(function(res) {
+            return parseInt(res.count);
+        });
+    };
+
     self.getKeysForNumber = function(number, deviceId) {
         if (deviceId === undefined)
             deviceId = "*";

libtextsecure/helpers.js

@@ -248,6 +248,14 @@ textsecure.processDecrypted = function(decrypted, source) {
     });
 };
 
+window.textsecure.refreshPreKeys = function() {
+    return textsecure.api.getMyKeys().then(function(preKeyCount) {
+        if (preKeyCount < 10) {
+            generateKeys();
+        }
+    });
+};
+
 function createAccount(number, verificationCode, identityKeyPair, single_device) {
     textsecure.storage.put('identityKey', identityKeyPair);