HOSN-app/app/src/pages/write-tweet/write-tweet.ts

import { Component } from "@angular/core";
import {
  IonicPage,
  NavController,
  NavParams,
  LoadingController
} from "ionic-angular";
import { FormBuilder, Validators, FormGroup } from "@angular/forms";
import { TwitterApiProvider } from "../../providers/twitter-api/twitter-api";
import { HttpClient } from "@angular/common/http";
import { Storage } from "@ionic/storage";
import Gun from "gun";

/**
 * Generated class for the WriteTweetPage page.
 *
 * See https://ionicframework.com/docs/components/#navigation for more info on
 * Ionic pages and navigation.
 */

@IonicPage()
@Component({
  selector: "page-write-tweet",
  templateUrl: "write-tweet.html"
})
export class WriteTweetPage {
  tweet: FormGroup;
  gun;

  constructor(
    public navCtrl: NavController,
    public navParams: NavParams,
    private formBuilder: FormBuilder,
    private twitter: TwitterApiProvider,
    private loadingCtrl: LoadingController,
    private http: HttpClient,
    private storage: Storage
  ) {
    this.gun = Gun();
    this.tweet = this.formBuilder.group({
      text: ["", Validators.maxLength(140)],
      p2p: [false]
    });
  }

  ionViewDidLoad() {}

  get tweetCharProgress() {
    let progress = 1 - this.tweet.value["text"].length / 140;
    let radius = 8;
    let circumference = Math.PI * radius * 2;
    return progress * circumference;
  }

  async submitTweet() {
    let loading = this.loadingCtrl.create();
    loading.present();

    if (this.tweet.value.p2p) {
      let hash = await this.postToIpfs(this.tweet.value["text"]);
      this.gun.get("username").put({ lastTweet: hash });
    } else {
      await this.twitter.tweet(this.tweet.value["text"]);
    }

    loading.dismiss();
    this.navCtrl.pop();
  }

  private async postToIpfs(text) {
    let url = "https://ipfs.infura.io:5001/api/v0/add";

    let data = {
      text: this.tweet.value["text"].trim(),
      userId: await this.storage.get("userId"),
      timestamp: Date.now()
    };

    let formData = new FormData();
    formData.append("data", JSON.stringify(data));

    let res = await this.http.post(url, formData).toPromise();
    console.log(res["Hash"]);
    return res["Hash"];
  }
}