closes #3917, closes #2941

public/src/admin/manage/category.js

@@ -176,6 +176,7 @@ define('admin/manage/category', [
 
 		$('.privilege-table-container').on('click', '[data-action="search.user"]', Category.addUserToPrivilegeTable);
 		$('.privilege-table-container').on('click', '[data-action="search.group"]', Category.addGroupToPrivilegeTable);
+		$('.privilege-table-container').on('click', '[data-action="copyToChildren"]', Category.copyPrivilegesToChildren);
 
 		Category.exposeAssumedPrivileges();
 	};
@@ -335,5 +336,14 @@ define('admin/manage/category', [
 		});
 	};
 
+	Category.copyPrivilegesToChildren = function() {
+		socket.emit('admin.categories.copyPrivilegesToChildren', ajaxify.data.category.cid, function(err) {
+			if (err) {
+				return app.alertError(err.message);
+			}
+			app.alertSuccess('Privileges copied!');
+		});
+	};
+
 	return Category;
 });

src/socket.io/admin/categories.js

@@ -4,7 +4,6 @@ var async = require('async'),
 
 	db = require('../../database'),
 	groups = require('../../groups'),
-	user = require('../../user'),
 	categories = require('../../categories'),
 	privileges = require('../../privileges'),
 	plugins = require('../../plugins'),
@@ -72,4 +71,41 @@ Categories.getPrivilegeSettings = function(socket, cid, callback) {
 	privileges.categories.list(cid, callback);
 };
 
+Categories.copyPrivilegesToChildren = function(socket, cid, callback) {
+	async.parallel({
+		category: function(next) {
+			categories.getCategories([cid], socket.uid, next);
+		},
+		privileges: function(next) {
+			privileges.categories.list(cid, next);
+		}
+	}, function(err, results) {
+		if (err) {
+			return callback(err);
+		}
+		var category = results.category[0];
+
+		async.eachSeries(category.children, function(child, next) {
+			copyPrivilegesToChildrenRecursive(child, results.privileges.groups, next);
+		}, callback);
+	});
+};
+
+function copyPrivilegesToChildrenRecursive(category, privilegeGroups, callback) {
+	async.eachSeries(privilegeGroups, function(privGroup, next) {
+		var privs = Object.keys(privGroup.privileges);
+		async.each(privs, function(privilege, next) {
+			var isSet = privGroup.privileges[privilege];
+			groups[isSet ? 'join' : 'leave']('cid:' + category.cid + ':privileges:' + privilege, privGroup.name, next);
+		}, next);
+	}, function(err) {
+		if (err) {
+			return callback(err);
+		}
+		async.eachSeries(category.children, function(child, next) {
+			copyPrivilegesToChildrenRecursive(child, privilegeGroups, next);
+		}, callback);
+	});
+}
+
 module.exports = Categories;

src/views/admin/partials/categories/privileges.tpl

@@ -41,7 +41,6 @@
 							<th class="text-center">{privileges.labels.groups.name}</th>
 							<!-- END privileges.labels.groups -->
 						</tr>
-						<!-- IF privileges.groups.length -->
 						<!-- BEGIN privileges.groups -->
 						<tr data-group-name="{privileges.groups.name}" data-private="<!-- IF privileges.groups.isPrivate -->1<!-- ELSE -->0<!-- ENDIF privileges.groups.isPrivate -->">
 							<td>
@@ -56,17 +55,12 @@
 						<!-- END privileges.groups -->
 						<tr>
 							<td colspan="{privileges.columnCount}">
+								<div class="btn-toolbar">
 									<button type="button" class="btn btn-primary pull-right" data-ajaxify="false" data-action="search.group"> Add Group</button>
+									<button type="button" class="btn btn-info pull-right" data-ajaxify="false" data-action="copyToChildren"> Copy to Children</button>
+								</div>
 							</td>
 						</tr>
-						<!-- ELSE -->
-						<tr>
-							<td colspan="{privileges.columnCount}">
-								<button type="button" class="btn btn-primary pull-right" data-ajaxify="false" data-action="search.group"> Add Group</button>
-								No group-specific privileges in this category.
-							</td>
-						</tr>
-						<!-- ENDIF privileges.groups.length -->
 					</table>
 					<div class="help-block">
 						If the <code>registered-users</code> group is granted a specific privilege, all other groups receive an