first implementation

.babelrc

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+{
+
+}

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+* text=auto

.gitignore

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+node_modules
+coverage
+dist
+.idea

.travis.yml

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+language: node_js
+node_js:
+  - v5
+  - v4
+  - '0.12'
+  - '0.10'

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Matteo Padovano <[email protected]>
+
+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.

README.md

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+# loopback-component-paypal 
+[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url]
+>
+
+## Installation
+
+```sh
+$ npm install --save loopback-component-paypal
+```
+
+## Usage
+Add configuration in file component-config.json
+```js
+{
+  "loopback-component-paypal": {
+    "clientID": "CLIENT_ID",
+    "clientSecret": "CLIENT_SECRET",
+    "mode": "sandbox",
+    "payment": {
+      "intent": "sale",
+      "redirect_urls": {
+        "return_url": "return_url",
+        "cancel_url": "cancel_url"
+      },
+      "payer": {
+        "payment_method": "paypal"
+      }
+    }
+  }
+}
+
+var PayPal = app.models.PayPal;
+PayPal.payment.create(create_payment_json, function (error, payment) {
+    if (error) {
+        console.log(error.response);
+        throw error;
+    } else {
+        console.log("Create Payment Response");
+        console.log(payment);
+    }
+});
+```
+## License
+
+MIT © [Matteo Padovano](https://github.com/mrbatista)
+
+
+[npm-image]: https://badge.fury.io/js/loopback-component-paypal.svg
+[npm-url]: https://npmjs.org/package/loopback-component-paypal
+[travis-image]: https://travis-ci.org/mrbatista/loopback-component-paypal.svg?branch=master
+[travis-url]: https://travis-ci.org/mrbatista/loopback-component-paypal
+[daviddm-image]: https://david-dm.org/mrbatista/loopback-component-paypal.svg?theme=shields.io
+[daviddm-url]: https://david-dm.org/mrbatista/loopback-component-paypal

gulpfile.js

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+var path = require('path');
+var gulp = require('gulp');
+var eslint = require('gulp-eslint');
+var excludeGitignore = require('gulp-exclude-gitignore');
+var mocha = require('gulp-mocha');
+var istanbul = require('gulp-istanbul');
+var nsp = require('gulp-nsp');
+var plumber = require('gulp-plumber');
+var babel = require('gulp-babel');
+var del = require('del');
+var isparta = require('isparta');
+
+// Initialize the babel transpiler so ES2015 files gets compiled
+// when they're loaded
+require('babel-core/register');
+
+gulp.task('static', function () {
+  return gulp.src('**/*.js')
+    .pipe(excludeGitignore())
+    .pipe(eslint())
+    .pipe(eslint.format())
+    .pipe(eslint.failAfterError());
+});
+
+gulp.task('nsp', function (cb) {
+  nsp({package: path.resolve('package.json')}, cb);
+});
+
+gulp.task('pre-test', function () {
+  return gulp.src('lib/**/*.js')
+    .pipe(excludeGitignore())
+    .pipe(istanbul({
+      includeUntested: true,
+      instrumenter: isparta.Instrumenter
+    }))
+    .pipe(istanbul.hookRequire());
+});
+
+gulp.task('test', ['pre-test'], function (cb) {
+  var mochaErr;
+
+  gulp.src('test/**/*.js')
+    .pipe(plumber())
+    .pipe(mocha({reporter: 'spec'}))
+    .on('error', function (err) {
+      mochaErr = err;
+    })
+    .pipe(istanbul.writeReports())
+    .on('end', function () {
+      cb(mochaErr);
+    });
+});
+
+gulp.task('watch', function () {
+  gulp.watch(['lib/**/*.js', 'test/**'], ['test']);
+});
+
+gulp.task('babel', ['clean'], function () {
+  return gulp.src('lib/**/*.js')
+    .pipe(babel())
+    .pipe(gulp.dest('dist'));
+});
+
+gulp.task('clean', function () {
+  return del('dist');
+});
+
+gulp.task('prepublish', ['nsp', 'babel']);
+gulp.task('default', ['static', 'test']);

lib/index.js

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+import assert from 'assert'
+import * as PayPalConnector from './paypal-connector'
+
+export default function(app, options) {
+
+  assert(typeof options === 'object', 'cannot initialize paypal component without a options object');
+
+  let loopback = app.loopback;
+  let ds = loopback.createDataSource(Object.assign(options, {connector: PayPalConnector}));
+  app.model('PayPal', {dataSource: ds, public: false});
+}

lib/paypal-connector.js

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+import {PayPalService} from './paypal-service';
+
+/**
+ * Initialize the paypal service as a connector for LoopBack data sources
+ * @param {dataSource} dataSource DataSource instance
+ * @prop {Object} settings Connector settings
+ */
+export function initialize(dataSource) {
+  let settings = dataSource.settings || {};
+  let connector = new PayPalService(settings);
+  dataSource.connector = connector;
+  dataSource.connector.dataSource = dataSource;
+
+  connector.DataAccessObject = DataAccessObject;
+
+  function DataAccessObject() {}
+  DataAccessObject.payment = connector.client.payment;
+  DataAccessObject.sale = connector.client.sale;
+  DataAccessObject.refund = connector.client.refund;
+  DataAccessObject.authorization = connector.client.authorization;
+  DataAccessObject.capture = connector.client.capture;
+  DataAccessObject.order = connector.client.order;
+  DataAccessObject.payout = connector.client.payout;
+  DataAccessObject.payoutItem = connector.client.payoutItem;
+  DataAccessObject.billingPlan = connector.client.billingPlan;
+  DataAccessObject.billingAgreement = connector.client.billingAgreement;
+  DataAccessObject.creditCard = connector.client.creditCard;
+  DataAccessObject.invoice = connector.client.invoice;
+  DataAccessObject.openIdConnect = connector.client.openIdConnect;
+  DataAccessObject.webProfile = connector.client.webProfile;
+  DataAccessObject.notification = connector.client.notification;
+  DataAccessObject.generate_token = connector.client.generate_token;
+  DataAccessObject.billing_plan = connector.client.billing_plan;
+}

lib/paypal-service.js

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+import paypal from 'paypal-rest-sdk';
+
+export class PayPalService {
+
+  constructor(options) {
+
+    paypal.configure({
+      client_id: options.clientID,
+      client_secret: options.clientSecret,
+      mode: options.mode || 'sandbox'
+    });
+    this.client = paypal;
+  }
+
+}

package.json

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+{
+  "name": "loopback-component-paypal",
+  "version": "0.1.0",
+  "description": "Loopback PayPal Component",
+  "homepage": "https://github.com/mrbatista/loopback-component-paypal",
+  "author": "Matteo Padovano <[email protected]> (https://github.com/mrbatista)",
+  "files": [
+    "dist"
+  ],
+  "main": "dist/index.js",
+  "keywords": [
+    "loopback",
+    "paypal"
+  ],
+  "devDependencies": {
+    "babel-core": "^5.8.35",
+    "babel-eslint": "^4.1.8",
+    "babel-preset-es2015": "^6.6.0",
+    "chai": "^3.5.0",
+    "del": "^2.0.2",
+    "dirty-chai": "^1.2.2",
+    "eslint": "^2.1.0",
+    "eslint-config-xo-space": "^0.10.0",
+    "eslint-plugin-babel": "^3.1.0",
+    "gulp": "^3.9.0",
+    "gulp-babel": "^5.1.0",
+    "gulp-eslint": "^2.0.0",
+    "gulp-exclude-gitignore": "^1.0.0",
+    "gulp-istanbul": "^0.10.3",
+    "gulp-line-ending-corrector": "^1.0.1",
+    "gulp-mocha": "^2.0.0",
+    "gulp-nsp": "^2.1.0",
+    "gulp-plumber": "^1.0.0",
+    "isparta": "^3.0.3",
+    "loopback": "^2.27.0"
+  },
+  "eslintConfig": {
+    "extends": "xo-space/esnext",
+    "env": {
+      "mocha": true
+    }
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mrbatista/loopback-component-paypal.git"
+  },
+  "scripts": {
+    "prepublish": "gulp prepublish",
+    "test": "gulp"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "paypal-rest-sdk": "^1.6.8"
+  },
+  "bugs": {
+    "url": "https://github.com/mrbatista/loopback-component-paypal/issues"
+  },
+  "directories": {
+    "test": "test"
+  }
+}

test/index.js

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+import * as chai from 'chai';
+import dirtyChai from 'dirty-chai'
+import loopback from 'loopback';
+import loopbackComponentPaypal from '../lib';
+let expect = chai.expect;
+chai.use(dirtyChai);
+
+describe('loopback-component-paypal', () => {
+  let app;
+  before((done) => {
+    app = loopback();
+    loopbackComponentPaypal(app, {});
+    done();
+  });
+
+  it('PayPal connector should have property payment', (done) => {
+    expect(app.models.PayPal.payment).to.exist();
+    done();
+  });
+});