Add v4 codebase

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

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+# Contributing to xero-node
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+We want to make contributing to this project as easy and transparent as possible, whether it's:
+
+- Reporting a bug
+- Discussing the current state of the code
+- Submitting a fix
+- Proposing new features
+- Becoming a maintainer
+
+The following is a set of guidelines for contributing to Xero and its projects, which are hosted in the [XeroAPI Organization](https://github.com/XeroAPI) on GitHub. These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+### Table Of Contents
+[Code of Conduct](#code-of-conduct)
+
+[I don't want to read this whole thing, I just have a question!!!](#i-dont-want-to-read-this-whole-thing-i-just-have-a-question)
+
+[How Can I Contribute?](#how-can-i-contribute)
+  * [Which version of SDK are you using?](#Which-version-of-the-SDK-are-you-using)
+  * [Reporting Bugs](#reporting-bugs)
+  * [Suggesting Enhancements](#suggesting-enhancements)
+  * [Pull Requests](#pull-requests)
+
+
+## Code of Conduct
+Please note that this project is released with a [Contributor Code of Conduct](https://github.com/XeroAPI/xero-node/blob/oauth2/CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
+
+## I don't want to read this whole thing I just have a question!!!
+
+> **Note:** Please don't file an issue to ask a question. You'll get faster results by using the resources below.
+
+We have an official [message board](https://community.xero.com/developer) where Xero API support and the community chimes in with helpful advice if you have questions.
+
+* [API Documentation](https://developer.xero.com/documentation/)
+* [Xero FAQ](https://developer.xero.com/faq)
+* [Community, the official Xero message board](https://community.xero.com/developer)
+* [Stackoverflow - Xero related](https://stackoverflow.com/questions/tagged/xero-api?sort=Newest)
+* [Submit requests for support](https://developer.xero.com/contact-xero-developer-platform-support/) to our API Support team.
+
+# How Can I Contribute?
+
+You can contribute by reporting bugs, suggesting enhancements, improving documentation i.e. [README](https://github.com/XeroAPI/xero-node/blob/oauth2/README.md) or submitting a pull request.
+
+
+## Which version of the SDK are you using?
+
+As of Sept 2019, support for oAuth 2 will be generally available for developers.  During this transition period from oAuth 1.0a to oAuth 2, we will be supporting two versions of the SDK.  
+
+
+* 2.x code resides in `master` and supports oAuth 1.0a
+* 3.x code resides in the `oauth2` branch and supports oAuth 2
+
+Bugs and enhancements for version 3.x will be prioritized over 2.x.
+
+## Reporting Bugs
+
+Bugs are tracked as issues in this repository.
+
+Before opening a new issue:
+* **check [the README](https://github.com/XeroAPI/xero-node/blob/oauth2/README.md)** to see if the behavior you observed might be expected and if configuration options are available to provide you with the desired behavior.
+
+* **perform a cursory search** to see if there's [an existing issue](https://github.com/XeroAPI/xero-node/issues) covering your feedback. If there is one and the issue is still open, **add a :+1: reaction** on the issue to express interest in the issue being resolved. That will help the team gauge interest without the noise of comments which trigger notifications to all watchers. Comments should be used only if you have new and useful information to share.
+
+### Write bug reports with detail, background, and sample code
+
+- Which version of the SDK are you using?
+- A quick summary and/or background
+- Steps to reproduce
+  - Be specific!
+  - Give sample code if you can. 
+- What you expected would happen
+- What actually happens
+- Notes (possibly including why you think this might be happening, or stuff you tried that didn't work)
+
+## Suggesting Enhancements
+
+When opening an issue for a feature request:
+* **use a clear and descriptive title** for the issue to identify the problem.
+* **include as many details as possible in the body**. Explain your use-case, the problems you're hitting and the solutions you'd like to see to address those problems.
+
+## Pull requests
+
+We welcome your feedback and pull requests. Be aware some code is generated and pull requests may not be the best solution -  see below.
+
+### We Use OpenAPI Generator
+The best way to propose changes to the codebase is to open an [issue](https://github.com/XeroAPI/xero-node/issues) and discuss with our team.  
+
+We are using [OpenAPI Generator](https://github.com/OpenAPITools/openapi-generator) and [our OpenAPI specs](https://github.com/XeroAPI/Xero-OpenAPI), to create and update our models and client classes.  Improvements may require updates to our OAS or our customized mustache templates instead of modifying via pull request.
+
+### Submit a pull request
+
+1. Fork and clone the repository
+1. Create a new branch: `git checkout -b my-branch-name`
+1. Make your change, add tests if needed
+1. Make sure the tests pass on your machine: `mvn test`
+1. Push to your fork and submit a pull request
+1. Pat your self on the back and wait for your pull request to be reviewed and merged.
+
+Here are a few things you can do that will increase the likelihood of your pull request being accepted:
+
+- Follow the [style guide](#style-guide).
+- Write tests.
+- Keep your change as focused as possible. If there are multiple changes you would like to make that are not dependent upon each other, consider submitting them as separate pull requests.
+- Write a [good commit message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+
+### Style Guide
+
+* 4 spaces for indentation rather than tabs
+
+## License
+By contributing, you agree that your contributions will be licensed under its MIT License.

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2019 Xero
+
+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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+# xero-node
+![npm](https://img.shields.io/npm/v/xero-node?label=xero-node)
+
+## Release of SDK with oAuth 2 support
+Version 4.x of Xero NodeJS SDK only supports oAuth2 authentication and the following API sets.
+* accounting
+
+Coming soon
+* bank feeds 
+* fixed asset 
+* files 
+* payroll
+* projects
+* xero hq
+
+## Usage
+Installation
+This SDK is published as an npm package called xero-node.
+
+```sh
+npm install --save xero-node
+```
+
+## Getting Started
+
+### Create a Xero App
+Follow these steps to create your Xero app
+
+* Create a [free Xero user account](https://www.xero.com/us/signup/api/) (if you don't have one)
+* Login to [Xero developer center](https://developer.xero.com/myapps)
+* Click "Try oAuth2" link
+* Enter your App name, company url, privacy policy url.
+* Enter the redirect URI (this is your callback url - localhost, etc)
+* Agree to terms and condition and click "Create App".
+* Click "Generate a secret" button.
+* Copy your client id and client secret and save for use later.
+* Click the "Save" button. You secret is now hidden.
+
+## Typescript example 
+A "kitchen sync" app is available that demonstrates interacting with each endpoint.
+Just [download the code](https://github.com/XeroAPI/xero-node-oauth2-app) and configure.
+
+## Javascript Example 
+This is a barebones example showing how to authenticate and display the 
+name of the Xero organisation you've connected to.
+
+```js
+'use strict';
+
+const express = require('express');
+const session = require('express-session');
+const  xero_node = require('xero-node')
+
+const client_id = 'YOUR-CLIENT_ID'
+const client_secret = 'YOUR-CLIENT_SECRET'
+const redirectUri = 'http://localhost:5000/callback'
+const scopes = 'openid profile email accounting.transactions accounting.settings offline_access'
+
+const xero = new xero_node.XeroClient({
+  clientId: client_id,
+  clientSecret: client_secret,
+  redirectUris: [redirectUri],
+  scopes: scopes.split(" ")
+});
+
+let app = express()
+
+app.set('port', (process.env.PORT || 3000))
+app.use(express.static(__dirname + '/public'))
+app.use(session({
+    secret: 'something crazy',
+    resave: false,
+    saveUninitialized: true,
+    cookie: { secure: false }
+}));
+
+app.get('/', function(req, res) {
+  res.send('<a href="/connect">Connect to Xero</a>');
+})
+
+app.get('/connect', async function(req, res) {
+  try {
+    let consentUrl = await xero.buildConsentUrl();	  
+    res.redirect(consentUrl);
+  } catch (err) {
+    res.send("Sorry, something went wrong");
+  }
+})
+
+app.get('/callback', async function(req, res) {
+    const url = "http://localhost:5000/" + req.originalUrl;
+    await xero.setAccessTokenFromRedirectUri(url);
+
+    // Optional: read user info from the id token
+    let tokenClaims = await xero.readIdTokenClaims();
+    const accessToken = await xero.readTokenSet();
+
+    req.session.tokenClaims = tokenClaims;
+    req.session.accessToken = accessToken;
+    req.session.xeroTenantId = xero.tenantIds[0];
+    res.redirect('/organisation');
+})
+
+app.get('/organisation', async function(req, res) {  
+  try {
+    const response = await xero.accountingApi.getOrganisations(xero.tenantIds[0])
+    res.send("Hello, " + response.body.organisations[0].name);
+  } catch (err) {
+    res.send("Sorry, something went wrong");
+  }
+})
+
+const PORT = process.env.PORT || 5000;
+app.listen(PORT, function() {
+  console.log("Your Xero basic public app is running at localhost:" + PORT)
+})
+```
+
+#### Project Structure
+```
+src/
+  |-  gen/        autogenerated TypeScript
+  `-  *.ts        handwritten TypeScript
+dist/             compiled JavaScript
+package.json
+```

jest.config.js

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+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  roots: ['<rootDir>/src/']
+};

package.json

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+{
+    "name": "xero-node",
+    "version": "4.0.2",
+    "description": "NodeJS client for Xero API with OAuth 2.0 support",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "author": "Xero Platform Team",
+    "license": "MIT",
+    "repository": {
+        "type": "git",
+        "url": "git://github.com/XeroAPI/xero-node.git"
+    },
+    "scripts": {
+        "build": "tsc",
+        "test": "jest"
+    },
+    "devDependencies": {
+        "@types/jest": "^25.0.0",
+        "@types/node": "^12.12.5",
+        "@types/request": "^2.48.3",
+        "jest": "^25.0.0",
+        "open": "^6.4.0",
+        "prompt": "^1.0.0",
+        "ts-jest": "^24.1.0",
+        "typescript": "^3.7.2"
+    },
+    "dependencies": {
+        "openid-client": "^3.8.3",
+        "request": "^2.88.0"
+    }
+}