k-server-query

server-query

Derby/racer server-query plugin. It allows only server-defined queries and denies arbitrary client queries.

install

With npm do:

npm install server-query

usage

In our derby-app:

derby.use(require('server-query'));
 
// or if you wish to use usual queries for some collections
// you should provide collections whitelist like here
 
derby.use(require('server-query'), ['auth', 'users', 'topics']);

On the server:

 
// Add server queries  
 
derby.on('serverQuery', function(store){ // Or racer.on
 
  // function addServerQuery accept
  // 'collection' - collection name
  // 'queryName'  - name of query
  // 'cb' - function that accepts 'params' and 'session'
  // and returns a query-object or error-string
  
  store.addServerQuery('items', 'main', function(params, session){
    return {type: 'public'};
  });
  
  store.addServerQuery('items', 'myItems', function(params, session){
    return {ownerId: session.userId};
  });
  
  store.addServerQuery('items', 'byType', function(params, session){
    
    // ++++++++++++++++++++++++++++
    // Should check params here!!!!
    // it's a security issue
    // ++++++++++++++++++++++++++++
    
    return {type: params.type};
  });
}
 

In order to bypass all checks for queries on some collections, just add those collection to the whitelist. This means that you will be able to use the usual model.query() on those collections - both server-side and client-side.

If you want to fine-grained access control to collections, please have a look at share-access module.

Using queries:

  // function serverQuery accepts 3 arguments:
  // 'collection' - collection name (should match one from addServerQuery)
  // 'queryName' - name of query (should match one from addServerQuery)
  // 'params' - object with query-params
  
  var query = model.serverQuery('items', 'byType', {
    type: 'global'
  });
 
  model.subscribe(query, function(){
    page.render('home');
  });

What is still allowed:

 
// You still can use path-query
var query = model.server('items', '_page.itemIds');
 
model.subscribe(query, function(){
  page.render('home');
});
 
// one-item fetch/subscriptions also aren't dennied
var itemId = params.itemId
 
var item = model.at('items.'+itemId);
 
model.subscribe(item,  function(){
  //...
});
 
// Or just
model.subscribe('items.' + itemId,  function(){
  //...
});
 
// But
 
model.subscribe('items',  function(err){
  // Will get Error here!!!!!
});

MIT License

Copyright (c) 2014 by Artur Zayats

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.