Merge pull request SAP-samples#428 from SAP-samples/multi-tenat-sample

multi tenant sample

samples/cf-multi-tenant-application/.prettierrc

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+{
+  "$schema": "http://json.schemastore.org/prettierrc",
+  "singleQuote": true,
+  "filepath": "*.ts",
+  "trailingComma": "none",
+  "arrowParens": "avoid"
+}

samples/cf-multi-tenant-application/README.md

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+# SAP Cloud SDK for JavaScript Multi-Tenant Sample Application
+
+## Description
+
+The code sample in this directory is a reference for the [multi-tenant application tutorial](https://sap.github.io/cloud-sdk/docs/js/tutorials/multi-tenant-application).
+You need to make adjustments to the code before deployment.
+The terms you need to replace are given in all caps and start with _`YOUR_`_ e.g. _`YOUR_REGION`_.
+
+Also, note that the samples here are intended as a didactic example and are not necessarily a best practice.
+The repositories' structure is as follows:
+
+- [./multi-tenant-app](./multi-tenant-app) - Contains the code of the multi-tenant application.
+  It contains a simple service endpoint and logic to be executed on subscription and unsubscription.
+- [./approuter](./approuter) - Contains the approuter necessary to attach JSON web tokens to the application.
+- [./service-config](./service-config) - Directory configurations for service instances.
+
+## Requirements
+
+The minimal requirements are:
+
+- A terminal to execute commands
+- A recent version of node and npm installed e.g. node 14 and npm 6
+- A recent installation of the [Cloud Foundry command line interface](https://developers.sap.com/tutorials/cp-cf-download-cli.html)
+- An IDE or a text editor of your choice
+- Access to a [SAP Business Technology Platform](https://www.sap.com/products/business-technology-platform.html) account
+- Entitlement to use resources like service instance creation and application processing units
+- Permission to deploy applications and create service instances
+
+## Download and Deployment
+
+To download the application run:
+
+```
+git clone \
+  --depth 1  \
+  --filter=blob:none  \
+  --sparse \
+  https://github.com/SAP-samples/cloud-sdk-js.git \
+;
+cd cloud-sdk-js
+git sparse-checkout set samples/cf-multi-tenant-application
+```
+
+### Create Services on SAP BTP Cloud Foundry
+
+Before you can deploy the application, you have to create a `destination` and `xsuaa` service instance.
+Their name should match the one that is used in the application `manifest.yml`, in this case:
+
+- `destination`
+- `xsuaa`
+
+### Deploy the Application to SAP BTP Cloud Foundry
+
+Run `cf push` in the application directory to deploy the application.
+Please follow the steps described in the [multi-tenant application tutorial](https://sap.github.io/cloud-sdk/docs/js/tutorials/multi-tenant-application) for the deployment steps of all components.

samples/cf-multi-tenant-application/approuter/manifest.yml

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+applications:
+  - name: approuter
+    routes:
+      - route: 'route-prefix-YOUR_SUBDOMAIN.cfapps.YOUR_REGION.hana.ondemand.com'
+    path: .
+    memory: 128M
+    buildpacks:
+      - nodejs_buildpack
+    env:
+      TENANT_HOST_PATTERN: 'route-prefix-(.*).cfapps.YOUR_REGION.hana.ondemand.com'
+      destinations: >
+        [
+          {"name":"multi-tenant-app","url":"https://multi-tenant-app.cfapps.YOUR_REGION.hana.ondemand.com","forwardAuthToken":true}
+        ]
+    services:
+      - xsuaa
+      - destination

samples/cf-multi-tenant-application/approuter/package.json

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+{
+  "name": "approuter",
+  "dependencies": {
+    "@sap/approuter": "latest"
+  },
+  "scripts": {
+    "start": "node node_modules/@sap/approuter/approuter.js"
+  }
+}

samples/cf-multi-tenant-application/approuter/xs-app.json

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+{
+  "welcomeFile": "index.html",
+  "routes": [
+    {
+      "source": "(.*)",
+      "target": "/$1",
+      "destination": "multi-tenant-app"
+    }
+  ]
+}

samples/cf-multi-tenant-application/multi-tenant-app/manifest.yml

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+applications:
+  - name: multi-tenant-app
+    path: .
+    memory: 256M
+    buildpacks:
+      - nodejs_buildpack
+    services:
+      - destination
+      - xsuaa
+    routes:
+      - route: 'multi-tenant-app.cfapps.YOUR_REGION.hana.ondemand.com'