Step 15.4: Implement getContactsFromAddressbook in the phone service

src/services/phone.ts

@@ -3,6 +3,7 @@ import { Accounts } from 'meteor/accounts-base';
 import { Meteor } from 'meteor/meteor';
 import { Platform } from 'ionic-angular';
 import { Sim } from '@ionic-native/sim';
+import { Contact, ContactFieldType, Contacts, IContactField, IContactFindOptions } from "@ionic-native/contacts";
 import { SmsReceiver } from "../ionic/sms-receiver";
 import * as Bluebird from "bluebird";
 import { TWILIO_SMS_NUMBERS } from "api/models";
@@ -12,7 +13,8 @@ import { Observable } from "rxjs";
 export class PhoneService {
   constructor(private platform: Platform,
               private sim: Sim,
-              private smsReceiver: SmsReceiver) {
+              private smsReceiver: SmsReceiver,
+              private contacts: Contacts) {
     Bluebird.promisifyAll(this.smsReceiver);
   }
 
@@ -64,6 +66,62 @@ export class PhoneService {
     }
   }
 
+  getContactsFromAddressbook(): Promise<string[]> {
+    const getContacts = (): Promise<Contact[]> => {
+      if (!this.platform.is('cordova')) {
+        return Promise.reject(new Error('Cannot get contacts: not cordova.'));
+      }
+
+      const fields: ContactFieldType[] = ["phoneNumbers"];
+      const options: IContactFindOptions = {
+        filter: "",
+        multiple: true,
+        desiredFields: ["phoneNumbers"],
+        hasPhoneNumber: true
+      };
+      return this.contacts.find(fields, options);
+    };
+
+    const cleanPhoneNumber = (phoneNumber: string): string => {
+      const phoneNumberNoSpaces: string = phoneNumber.replace(/ /g, '');
+
+      if (phoneNumberNoSpaces.charAt(0) === '+') {
+        return phoneNumberNoSpaces;
+      } else if (phoneNumberNoSpaces.substring(0, 2) === "00") {
+        return '+' + phoneNumberNoSpaces.slice(2);
+      } else {
+        // Use user's international prefix when absent
+        // FIXME: update meteor-accounts-phone typings
+        const prefix: string = (<any>Meteor.user()).phone.number.substring(0, 3);
+
+        return prefix + phoneNumberNoSpaces;
+      }
+    };
+
+    return new Promise((resolve, reject) => {
+      getContacts()
+        .then((contacts: Contact[]) => {
+          const arrayOfArrays: string[][] = contacts
+            .map((contact: Contact) => {
+              return contact.phoneNumbers
+                .filter((phoneNumber: IContactField) => {
+                  return phoneNumber.type === "mobile";
+                }).map((phoneNumber: IContactField) => {
+                  return cleanPhoneNumber(phoneNumber.value);
+                }).filter((phoneNumber: string) => {
+                  return phoneNumber.slice(1).match(/^[0-9]+$/) && phoneNumber.length >= 8;
+                });
+            });
+          const flattenedArray: string[] = [].concat(...arrayOfArrays);
+          const uniqueArray: string[] = [...new Set(flattenedArray)];
+          resolve(uniqueArray);
+        })
+        .catch((e: Error) => {
+          reject(e);
+        });
+    });
+  }
+
   verify(phoneNumber: string): Promise<void> {
     return new Promise<void>((resolve, reject) => {
       Accounts.requestPhoneVerification(phoneNumber, (e: Error) => {