lemmy/ui/src/components/create-post.tsx

import { Component } from 'inferno';
import { Subscription } from 'rxjs';
import { retryWhen, delay, take } from 'rxjs/operators';
import { PostForm } from './post-form';
import { toast, wsJsonToRes } from '../utils';
import { WebSocketService } from '../services';
import {
  UserOperation,
  PostFormParams,
  WebSocketJsonResponse,
  GetSiteResponse,
  Site,
} from '../interfaces';
import { i18n } from '../i18next';

interface CreatePostState {
  site: Site;
}

export class CreatePost extends Component<any, CreatePostState> {
  private subscription: Subscription;
  private emptyState: CreatePostState = {
    site: {
      id: undefined,
      name: undefined,
      creator_id: undefined,
      published: undefined,
      creator_name: undefined,
      number_of_users: undefined,
      number_of_posts: undefined,
      number_of_comments: undefined,
      number_of_communities: undefined,
      enable_downvotes: undefined,
      open_registration: undefined,
      enable_nsfw: undefined,
    },
  };

  constructor(props: any, context: any) {
    super(props, context);
    this.handlePostCreate = this.handlePostCreate.bind(this);
    this.state = this.emptyState;

    this.subscription = WebSocketService.Instance.subject
      .pipe(retryWhen(errors => errors.pipe(delay(3000), take(10))))
      .subscribe(
        msg => this.parseMessage(msg),
        err => console.error(err),
        () => console.log('complete')
      );

    WebSocketService.Instance.getSite();
  }

  componentWillUnmount() {
    this.subscription.unsubscribe();
  }

  render() {
    return (
      <div class="container">
        <div class="row">
          <div class="col-12 col-lg-6 offset-lg-3 mb-4">
            <h5>{i18n.t('create_post')}</h5>
            <PostForm
              onCreate={this.handlePostCreate}
              params={this.params}
              enableDownvotes={this.state.site.enable_downvotes}
              enableNsfw={this.state.site.enable_nsfw}
            />
          </div>
        </div>
      </div>
    );
  }

  get params(): PostFormParams {
    let urlParams = new URLSearchParams(this.props.location.search);
    let params: PostFormParams = {
      name: urlParams.get('title'),
      community: urlParams.get('community') || this.prevCommunityName,
      body: urlParams.get('body'),
      url: urlParams.get('url'),
    };

    return params;
  }

  get prevCommunityName(): string {
    if (this.props.match.params.name) {
      return this.props.match.params.name;
    } else if (this.props.location.state) {
      let lastLocation = this.props.location.state.prevPath;
      if (lastLocation.includes('/c/')) {
        return lastLocation.split('/c/')[1];
      }
    }
    return undefined;
  }

  handlePostCreate(id: number) {
    this.props.history.push(`/post/${id}`);
  }

  parseMessage(msg: WebSocketJsonResponse) {
    console.log(msg);
    let res = wsJsonToRes(msg);
    if (msg.error) {
      toast(i18n.t(msg.error), 'danger');
      return;
    } else if (res.op == UserOperation.GetSite) {
      let data = res.data as GetSiteResponse;
      this.state.site = data.site;
      this.setState(this.state);
      document.title = `${i18n.t('create_post')} - ${data.site.name}`;
    }
  }
}