add apps.getMemoryLimit

src/apps.js

@@ -63,6 +63,7 @@ exports = module.exports = {
 
     getDataDir,
     getIconPath,
+    getMemoryLimit,
 
     downloadFile,
     uploadFile,
@@ -445,6 +446,20 @@ function getIconPath(app, options, callback) {
     callback(new BoxError(BoxError.NOT_FOUND, 'No icon'));
 }
 
+function getMemoryLimit(app) {
+    assert.strictEqual(typeof app, 'object');
+
+    let memoryLimit = app.memoryLimit || app.manifest.memoryLimit || 0;
+
+    if (memoryLimit === -1) { // unrestricted
+        memoryLimit = 0;
+    } else if (memoryLimit === 0 || memoryLimit < constants.DEFAULT_MEMORY_LIMIT) { // ensure we never go below minimum (in case we change the default)
+        memoryLimit = constants.DEFAULT_MEMORY_LIMIT;
+    }
+
+    return memoryLimit;
+}
+
 function postProcess(app, domainObjectMap) {
     let result = {};
     for (let portName in app.portBindings) {