Cordova In App Purchase Subscriptions

cordova-in-app-purchase-subscriptions.ts

import {Injectable} from '@angular/core';
import {Device} from '@ionic-native/device';
import {InAppPurchase} from '@ionic-native/in-app-purchase';
import {Storage} from '@ionic/storage';
import {AppAds} from '../appads/appads';

import {Http, Headers, RequestOptions} from '@angular/http';
import 'rxjs/add/operator/map';
import { Events } from 'ionic-angular';

/*
  In App Purchases
  This is a provider, you need to add this to your app module then call the methods from somewhere else
  See http://scottbolinger.com/cordova-in-app-purchases-validating-subscriptions for tutorial
  Required plugin: http://ionicframework.com/docs/native/in-app-purchase/
  Also see https://github.com/AlexDisler/cordova-plugin-inapppurchase
*/
@Injectable()
export class IAP {
  productId: string;

  constructor( 
    private iap: InAppPurchase,
    public appads: AppAds,
    public storage: Storage,
    private http: Http,
    public events: Events
    ) {
  }
  
  // create the subscription
  subscribeMembership( id ) {

    // we have to get products before we can buy
    this.iap.getProducts( [ id ] ).then( products => {

      // after we get product, buy it
      this.iap.subscribe( id ).then( result => {
        
        console.log(result)
        // subscribed! do something...

      })
      .catch( err => {
        console.log(err)
      })

    })
    .catch( err => {
      console.log(err)
    })

  }
  
  // restore in app purchase (required)
  restoreMembership( id ) {

    this.productId = id;

    this.iap.restorePurchases().then( result => {
        
        // loop through purchases to find the one we are looking for
        for (var i = 0; i < result.length; ++i) {

          // TODO: check result[i].state for cancelled or refunded

          if( result[i].productId == this.productId ) {

            console.log( 'Purchase found! Do something...', result )

            return;

          }

        }
 
    })
    .catch( err => {
        console.log(err)
    })

  }
   
   // check if membership is still active. Don't call this every app open, it requires iTunes login.
  checkStatus() {

    // nested promises, oh my!
    return new Promise( (resolve, reject) => {

        // first, ask Apple for the receipt. We get back an encrypted string.
        this.iap.getReceipt()
        .then( receipt => {

          console.log('encoded', receipt)

          return receipt

        })
        .then( receiptData => {

          // next, validate the encoded receipt with Apple, and get back the human readable format
          this.validateReceipt( receiptData ).then( receipt => {

            console.log('validate receipt response', receipt)

            // finally, send the receipt to the server and resolve the promise with the result
            this.sendReceiptToServer(receipt).then( validity => {
              console.log('validity response', validity)
              resolve( validity )
            })

          })

        })
        .catch( err => {

          let error = this.getErrMsg( err );

          reject( err )
          console.log(err)

        })

    })

  }

  validateReceipt( receiptData ) {

    return new Promise( (resolve ) => {

      let headers = new Headers({ 'Content-Type': 'application/json' });
      let options = new RequestOptions({ headers: headers });

      let data = {
        'password': 'XXXXXXXXXXXXXXXXXXX', // the shared secret key for your in app purchase https://stackoverflow.com/questions/5022296/generate-shared-secret-key-in-itunes-connect-for-in-app-purchase
        'receipt-data': receiptData
      }

      this.http.post( 'https://buy.itunes.apple.com/verifyReceipt', data, options )
          .subscribe(response => {

            let receipt = JSON.parse(response['_body']).receipt
            resolve(receipt)
            // purchases can be found at receipt.in_app <Array>
            // will need to loop through them and get most recent, then work with expiration date
          },
          error => {
            // probably a bad url or 404
            console.log(error);
          })

    })

  }

  sendReceiptToServer( receipt ) {

    return new Promise( (resolve ) => {

        console.log( 'sendReceiptToServer', receipt )

        let url = 'https://mysite.com/wp-json/app/membership-status' // url to the PHP file or endpoint, see code below

        let data = {
          receipt: JSON.stringify( receipt )
        }

        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({ headers: headers });

        this.http.post( url, data, options )
          .subscribe(response => {

            console.log('server response', response)
            // This is the end of the road. We resolve with the server response so we know if the subscription is active or not.
            resolve( response['_body'] );

          },
          error => {
            resolve(false)
            // probably a bad url or 404
            console.log(error);
          })

    })

  }
  
}

its very awesome