wallet-core/src/pages/confirm-contract.tsx

/*
 This file is part of TALER
 (C) 2015 GNUnet e.V.

 TALER is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 TALER is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * Page shown to the user to confirm entering
 * a contract.
 *
 * @author Florian Dold
 */

"use strict";

import {substituteFulfillmentUrl} from "src/helpers";
import {Contract, AmountJson, ExchangeRecord} from "src/types";
import {OfferRecord} from "src/wallet";
import {renderContract, prettyAmount} from "src/renderHtml";
import {getExchanges} from "src/wxApi";


interface DetailState {
  collapsed: boolean;
}

interface DetailProps {
  contract: Contract
  collapsed: boolean
  exchanges: null|ExchangeRecord[];
}


class Details extends React.Component<DetailProps, DetailState> {
  constructor(props: DetailProps) {
    super(props);
    console.log("new Details component created");
    this.state = {
      collapsed: props.collapsed,
    };

    console.log("initial state:", this.state);
  }

  render() {
    if (this.state.collapsed) {
      return (
        <div>
          <button className="linky"
                  onClick={() => { this.setState({collapsed: false} as any)}}>
            show more details
          </button>
        </div>
      );
    } else {
      return (
        <div>
          <button className="linky"
                  onClick={() => this.setState({collapsed: true} as any)}>
            show less details
          </button>
          <div>
            Accepted exchanges:
            <ul>
              {this.props.contract.exchanges.map(
                e => <li>{`${e.url}: ${e.master_pub}`}</li>)}
            </ul>
            Exchanges in the wallet:
            <ul>
              {(this.props.exchanges || []).map(
                (e: ExchangeRecord) =>
                  <li>{`${e.baseUrl}: ${e.masterPublicKey}`}</li>)}
            </ul>
          </div>
        </div>);
    }
  }
}

interface ContractPromptProps {
  offerId: number;
}

interface ContractPromptState {
  offer: OfferRecord|null;
  error: string|null;
  payDisabled: boolean;
  exchanges: null|ExchangeRecord[];
}

class ContractPrompt extends React.Component<ContractPromptProps, ContractPromptState> {
  constructor() {
    super();
    this.state = {
      offer: null,
      error: null,
      payDisabled: true,
      exchanges: null
    }
  }

  componentWillMount() {
    this.update();
  }

  componentWillUnmount() {
    // FIXME: abort running ops
  }

  async update() {
    let offer = await this.getOffer();
    this.setState({offer} as any);
    this.checkPayment();
    let exchanges = await getExchanges();
    this.setState({exchanges} as any);
  }

  getOffer(): Promise<OfferRecord> {
    return new Promise((resolve, reject) => {
      let msg = {
        type: 'get-offer',
        detail: {
          offerId: this.props.offerId
        }
      };
      chrome.runtime.sendMessage(msg, (resp) => {
        resolve(resp);
      });
    })
  }

  checkPayment() {
    let msg = {
      type: 'check-pay',
      detail: {
        offer: this.state.offer
      }
    };
    chrome.runtime.sendMessage(msg, (resp) => {
      if (resp.error) {
        console.log("check-pay error", JSON.stringify(resp));
        switch (resp.error) {
          case "coins-insufficient":
            let msgInsufficient = i18n`You have insufficient funds of the requested currency in your wallet.`;
            let msgNoMatch = i18n`You do not have any funds from an exchange that is accepted by this merchant.
              None of the exchanges accepted by the merchant is known to your wallet.`;
            if (this.state.exchanges && this.state.offer) {
              let acceptedExchangePubs = this.state.offer.contract.exchanges.map((e) => e.master_pub);
              let ex = this.state.exchanges.find((e) => acceptedExchangePubs.indexOf(e.masterPublicKey) >= 0);
              if (ex) {
                this.state.error = msgInsufficient;
              } else {
                this.state.error = msgNoMatch;
              }
            } else {
              this.state.error = msgInsufficient;
            }
            break;
          default:
            this.state.error = `Error: ${resp.error}`;
            break;
        }
        this.state.payDisabled = true;
      } else {
        this.state.payDisabled = false;
        this.state.error = null;
      }
      this.setState({} as any);
      window.setTimeout(() => this.checkPayment(), 500);
    });
  }

  doPayment() {
    let d = {offer: this.state.offer};
    chrome.runtime.sendMessage({type: 'confirm-pay', detail: d}, (resp) => {
      if (resp.error) {
        console.log("confirm-pay error", JSON.stringify(resp));
        switch (resp.error) {
          case "coins-insufficient":
            this.state.error = "You do not have enough coins of the" +
              " requested currency.";
            break;
          default:
            this.state.error = `Error: ${resp.error}`;
            break;
        }
        this.setState({} as any);
        return;
      }
      let c = d.offer!.contract;
      console.log("contract", c);
      document.location.href = substituteFulfillmentUrl(c.fulfillment_url,
                                                        this.state.offer);
    });
  }


  render() {
    if (!this.state.offer) {
      return <span>...</span>;
    }
    let c = this.state.offer.contract;
    return (
      <div>
        <div>
          {renderContract(c)}
        </div>
        <button onClick={() => this.doPayment()}
                disabled={this.state.payDisabled}
                className="accept">
          Confirm payment
        </button>
        <div>
          {(this.state.error ? <p className="errorbox">{this.state.error}</p> : <p />)}
        </div>
        <Details exchanges={this.state.exchanges} contract={c} collapsed={!this.state.error}/>
      </div>
    );
  }
}


export function main() {
  let url = URI(document.location.href);
  let query: any = URI.parseQuery(url.query());
  let offerId = JSON.parse(query.offerId);

  ReactDOM.render(<ContractPrompt offerId={offerId}/>, document.getElementById(
    "contract")!);
}