feat(express): add Express middleware

example/index.js

@@ -0,0 +1,19 @@
+var express = require('express');
+var graffiti = require('../');
+var graffitiMongoose = require('@risingstack/graffiti-mongoose');
+
+var app = express();
+
+app.use(graffiti.express({
+  prefix: '/graphql',
+  adapter: graffitiMongoose,
+  models: []
+}));
+
+app.listen(3000, function (err) {
+  if (err) {
+    throw err
+  };
+
+  console.log('server is listening');
+});

package.json

@@ -20,11 +20,15 @@
   "devDependencies": {
     "chai": "^3.2.0",
     "eslint": "1.0.0-rc-3",
+    "express": "^4.13.1",
     "mocha": "^2.2.5",
     "pre-commit": "^1.0.10"
   },
   "pre-commit": [
     "eslint",
     "test"
-  ]
+  ],
+  "dependencies": {
+    "graphql": "^0.1.8"
+  }
 }

src/config.js

@@ -0,0 +1,3 @@
+var config = {};
+
+module.exports = config;

src/express/index.js

@@ -1,5 +1,39 @@
-function express() {
+var config = require('../config');
+var graphql = require('graphql').graphql;
+var checkDep = require('../util').checkDep;
 
+function isGet(request) {
+  return request.method === 'GET';
+}
+
+function isPrefixed(request, prefix) {
+  return request.path.indexOf(prefix) === 0;
+}
+
+function express(options) {
+
+  var models = checkDep(options, 'models');
+  var adapter = checkDep(options, 'adapter');
+  var prefix = checkDep(options, 'prefix');
+
+  var schema = adapter.getSchema(models);
+
+  return function(request, respone, next) {
+
+    var query = request.query.q;
+
+    if (isGet(request) && isPrefixed(request, prefix)) {
+      return graphql(schema, query)
+        .then(function(result) {
+          respone.json(result);
+        })
+        .catch(function(err) {
+          next(err);
+        });
+    }
+
+    return next();
+  };
 }
 
 module.exports = express;

src/express/index.spec.js

@@ -0,0 +1,7 @@
+var expect = require('chai').expect;
+
+describe('graffiti express', function() {
+
+  var express = require('./');
+
+});

src/util/index.js

@@ -1,9 +1,9 @@
-function checkDep (obj, propName) {
+function checkDep(obj, propName) {
   if (!obj) {
     throw new Error('Object cannot be undefined');
   }
 
-  if(!obj[propName]) {
+  if (!obj[propName]) {
     throw new Error(propName + ' cannot be undefined');
   }
 

src/util/index.spec.js

@@ -9,7 +9,7 @@ describe('graffiti util', function() {
     it('throws if first argument is undefined', function() {
 
       try {
-        util.checkDep()
+        util.checkDep();
       } catch (ex) {
         expect(ex.message).to.eql('Object cannot be undefined');
         return;
@@ -30,7 +30,7 @@ describe('graffiti util', function() {
       throw new Error('Error should have been thrown');
     });
 
-    it('returns the property', function () {
+    it('returns the property', function() {
 
       var prop = util.checkDep({
         colour: 'red'