node-ui5

A NodeJS wrapper for OpenUI5 to leverage tools like MockServer or ODataModel.

Setup

• Use npm to install: npm install node-ui5 (don't forget --save if part of your project)

Usage

require('node-ui5').then(({sap}) => {
  // use sap, for instance:
  sap.ui.require([
    'sap/ui/model/odata/v2/ODataModel'
  ], async function (ODataModel) {
    console.log('Creating ODataModel...')
    const model = new ODataModel({
      serviceUrl: 'https://services.odata.org/V2/OData/OData.svc'
    })
    await model.metadataLoaded()
    console.log('Loading products...')
    model.read('/Products', {
      success: data => {
        data.results.forEach(product => {
          console.log(product.Name.padEnd(20, ' '), product.Description)
        })
      }
    })
  })
})

You may use the factory to specify options:

require('node-ui5/factory')({
  bootstrapLocation: 'https://openui5.hana.ondemand.com/resources/sap-ui-core.js',
  verbose: true
}).then(({sap}) => {
  // use sap
})

You may map local directories:

require('node-ui5/factory')({
  exposeAsGlobals: true,
  resourceroots: {
    myApp: __dirname
  },
  verbose: true
}).then(() => {
  sap.ui.require([
    "myApp/mock/server"
  ], function () {
    /*...*/
  })
})

Available options

• bootstrapLocation: provides URL of the sap-ui-core.js bootstrap
• exposeAsGlobals: set to true to make window and sap be globally available in NodeJS
• resourceroots: an optional dictionary for mapping resources to local folders or remote resources
• verbose: set to true to see details on HTTP requests and output ui5 traces
• fastButIncompleteSimulation: set to true to replace jsdom with a faster (but incomplete) browser simulation. Can also be set by adding --fast on the command line.
• verbose: set to true to enable traces. Can also be set by adding --verbose on the command line.
• debug: set to true to enable all UI5 traces. When set, verbose mode is automatically enabled. Can also be set by adding --debug on the command line.

node-ui5 helpers

Own modules

The package offers specific modules available through sap.ui.define / sap.ui.require to simplify development:

• 'node-ui5/authenticate/basic-with-csrf' provides a basic authentication method with x-csrf-token generation. The method expects an object composed of url, user and password string values and returns a promise resolved to an object containing parameters expected by the ODataModel constructor
• 'node-ui5/promisify' converts some callback API onto promise API by generating Async methods:
  • CRUD operations of ODataModel

const CONNECTION = {
  url: 'https://my.odata.system/SERVICE',
  user: 'arnaud',
  password: '12345'
}
require('node-ui5').then(({sap}) => {
  sap.ui.require([
    'sap/ui/model/odata/v2/ODataModel',
    'node-ui5/authenticate/basic-with-csrf',
    'node-ui5/promisify',
], async function (ODataModel, authenticate) {
      const model = new ODataModel(await authenticate(CONNECTION))
      await model.metadataLoaded()
      console.log('Listing entities...')
      var data = await model.readAsync('/EntitySet')
      data.results.forEach(entity => {
        let name = entity.Name
        if (name.length > 40) {
            name = `${name.substring(0, 37)}...`
        }
        console.log(name.padEnd(40, ' '), entity.Guid)
      })
      console.log(`Found ${data.results.length} entities`)
    })
})

Proxy server

The package also provides a server module that implements proxy features.

require('node-ui5/serve')({
  port: 8080,
  mappings: [{
    // http/https proxy
    match: /^\/proxy\/(https?)\/(.*)/,
    url: '$1://$2'
  }, {
    // default access to index.html
    match: /^\/$/,
    file: path.join(__dirname, 'index.html')
  }, {
    // mapping to file access
    match: /(.*)/,
    file: path.join(__dirname, '$1')
  }]
}).on('ready', () => {
  console.log('Server started')
})

The options are:

• hostname: (default: '127.0.0.1') hostname the server should listen to
• port: (default: 8080) port the server should listen to
• ssl: specify to implement secured http (https), it must contain the path to the private key (member key) and to the certificate (member cert)
• window: if you plan to use the mock mapping, the window object must be transmitted
• verbose: (default: true if --verbose or --debug is specified on the command line) set to true to enable traces
• mappings: an array of mapping objects as detailed below. Mappings are evaluated in the given order

A mapping object is composed of at least two members:

• match: a regular expression matching the requested URL, capturing groups can be specified and values reused in the handler using $1, $2...
• One of these handlers:
  • mock: transmit to the mock server by redirecting to an AJAX request
  • ui5resources: transmit to UI5 resources loaded by node-ui5
  • url: URL redirection
  • custom: a function receiving request and response. Capturing group values are transmitted as additional parameters
  • file: file redirection

Example:

[{
  // mock server mapping (with a different base URL)
  match: /^\/api\/(.*)/,
  mock: '/odata/TODO_SRV/$1'
}, {
  // UI5 resources
  match: /\/resources\/(.*)/,
  ui5resources: '$1'
}, {
  // http/https proxy
  match: /^\/proxy\/(https?)\/(.*)/,
  url: '$1://$2'
}, {
  // echo service
  match: /^\/echo\/(.*)$/,
  custom: (request, response, textToEcho) => {
    response.writeHead(200, {
      'Content-Type': 'text/plain',
      'Content-Length': textToEcho.length
    })
    response.end(textToEcho)
  }
}, {
  // default access to index.html
  match: /^\/$/,
  file: path.join(__dirname, 'index.html')
}, {
  // mapping to file access
  match: /(.*)/,
  file: path.join(__dirname, '$1')
}]

How does it work ?

OpenUI5 is a browser library.

Thanks to jsdom and some tweaked XHR objects, the library is loaded in a NodeJS environment.

With version 2, a faster but limited simulation of browser is implemented (and available with the fastButIncompleteSimulation option).

NOTES

CORS implementation of jsdom is prevented by the custom XHR overrides.

If you plan to install the module globally (npm install -g node-ui5), you must define the environment variable NODE_PATH with:

• set NODE_PATH=%APPDATA%\npm\node_modules on Windows environment
• export NODE_PATH=/usr/local/lib/node_modules on a Unix-like environment

If you plan to connect to an https server with specific certificates, make sure to declare the certificate authority with the environment variable NODE_EXTRA_CA_CERTS or to ignore certificate errors by setting the environment variable NODE_TLS_REJECT_UNAUTHORIZED to 0.