refactor(*): Remove express wrapper, change default package export to…

… express route handler

Removed the express wrapper around the package. Replaced the main export of the package with the
configured express-graphql instance so that this package can be installed into othr connect-based
packages without enforcing the use of express, or the authentication methods previously used.

BREAKING CHANGE: Removed express boilerplate. Package now only exposes GraphQL route handler.

package.json

@@ -1,8 +1,8 @@
 {
-	"name": "healthgraph-middleware",
+	"name": "healthgraphql",
 	"version": "0.0.0",
-	"description": "Healthgraph API middleware",
-	"main": "src/app.js",
+	"description": "GraphQL route handler for accessing the Healthgraph API",
+	"main": "src/healthgrahql.js",
 	"license": "MIT",
 	"config": {
 		"commitizen": {
@@ -16,25 +16,22 @@
 		"cz-conventional-changelog": "^2.0.0",
 		"eslint": "^3.17.1",
 		"eslint-config-degree53-core": "^3.0.11",
-		"eslint-config-degree53-es6": "^3.0.1",
-		"nodemon": "^1.11.0"
+		"eslint-config-degree53-es6": "^3.0.1"
 	},
 	"dependencies": {
-		"cookie-parser": "^1.4.3",
 		"dataloader": "^1.3.0",
-		"ejs": "^2.5.6",
-		"express": "^4.15.2",
 		"express-graphql": "^0.6.3",
 		"graphql": "^0.9.1",
 		"graphql-relay": "^0.5.1",
 		"node-polyglot": "^2.2.2",
 		"superagent": "^3.5.0",
-		"superagent-promise": "^1.1.0",
-		"winston": "^2.3.1"
+		"superagent-promise": "^1.1.0"
+	},
+	"engines": {
+		"node": ">6.10.0"
 	},
 	"scripts": {
-		"lint": "eslint src/",
-		"start": "nodemon src/app.js"
+		"lint": "eslint src/"
 	},
 	"eslintConfig": {
 		"env": {

src/data-types/node-interface.js

@@ -3,7 +3,7 @@ const nodeDefinitions = require('graphql-relay').nodeDefinitions;
 
 const { nodeInterface, nodeField } = nodeDefinitions(
 	(globalId, context) => {
-		const { type, id } = fromGlobalId(globalId);
+		const { id } = fromGlobalId(globalId);
 		return context.healthGraphLoader.load(id);
 	},
 	object => {

src/healthgraphql.js

@@ -0,0 +1,51 @@
+const graphqlHTTP = require('express-graphql');
+const graphql = require('graphql');
+const GraphQLSchema = graphql.GraphQLSchema;
+const UserType = require('data-types/user');
+const createLoader = require('helpers/healthgraph-loader');
+const createStrengthItem = require('mutations/strength-training/create-item');
+const deleteStrengthItem = require('mutations/strength-training/delete-item');
+const editStrengthItem = require('mutations/strength-training/edit-item');
+
+const DEFAULTS = {
+	getAccessToken () { },
+	graphiql: false
+};
+
+/**
+ *
+ * @param {object} options - Configuration object
+ * @param {boolean} [options.graphiql=false] - Enable graphiql interface
+ * @param {function} options.getAccessToken - Function to get the access token to be used for the request to the Healthgraph
+ * @returns {*}
+ */
+module.exports = function (options = {}) {
+
+	const opts = Object.assign(DEFAULTS, options);
+
+	return graphqlHTTP(req => {
+
+		const access_token = opts.getAccessToken(req);
+		const healthGraphLoader = createLoader(access_token);
+
+		return {
+			context: {
+				access_token,
+				healthGraphLoader
+			},
+			graphiql: opts.graphiql,
+			schema: new GraphQLSchema({
+				query: UserType,
+				mutation: new graphql.GraphQLObjectType({
+					name: 'healthgraph',
+					fields: {
+						create_strength_activity: createStrengthItem,
+						delete_strength_activity: deleteStrengthItem,
+						edit_strength_activity: editStrengthItem
+					}
+				})
+			})
+		}
+	});
+
+};

src/helpers/healthgraph-loader.js

@@ -1,15 +1,12 @@
 const request = require('superagent-promise')(require('superagent'), Promise);
 const DataLoader = require('dataloader');
-const log = require('./logging');
 const HEALTHGRAPH = require('../constants/healthgraph');
 
 module.exports = function createLoader (access_token) {
 
 	return new DataLoader(
 		urls => Promise.all(urls.map(uri => {
 
-			log.info('HEALTHGRAPH_REQUEST', {uri});
-
 			return request
 				.get(`${HEALTHGRAPH.BASE_URL}${uri}`)
 				.query({