104 lines
3.5 KiB
JavaScript
104 lines
3.5 KiB
JavaScript
// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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import { uniq } from 'lodash';
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import ABI from '~/contracts/abi/certifier.json';
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import Contract from '~/api/contract';
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import Contracts from '~/contracts';
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import { addCertification, removeCertification } from './actions';
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export default class CertificationsMiddleware {
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toMiddleware () {
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const api = Contracts.get()._api;
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const badgeReg = Contracts.get().badgeReg;
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const contract = new Contract(api, ABI);
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const Confirmed = contract.events.find((e) => e.name === 'Confirmed');
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const Revoked = contract.events.find((e) => e.name === 'Revoked');
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let certifiers = [];
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let accounts = []; // these are addresses
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const fetchConfirmedEvents = (dispatch) => {
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if (certifiers.length === 0 || accounts.length === 0) return;
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api.eth.getLogs({
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fromBlock: 0,
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toBlock: 'latest',
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address: certifiers.map((c) => c.address),
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topics: [ [ Confirmed.signature, Revoked.signature ], accounts ]
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})
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.then((logs) => contract.parseEventLogs(logs))
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.then((logs) => {
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logs.forEach((log) => {
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const certifier = certifiers.find((c) => c.address === log.address);
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if (!certifier) {
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throw new Error(`Could not find certifier at ${log.address}.`);
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}
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const { id, name, title, icon } = certifier;
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if (log.event === 'Revoked') {
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dispatch(removeCertification(log.params.who.value, id));
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} else {
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dispatch(addCertification(log.params.who.value, id, name, title, icon));
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}
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});
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})
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.catch((err) => {
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console.error('Failed to fetch Confirmed events:', err);
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});
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};
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return (store) => (next) => (action) => {
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switch (action.type) {
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case 'fetchCertifiers':
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badgeReg.certifierCount().then((count) => {
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new Array(+count).fill(null).forEach((_, id) => {
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badgeReg.fetchCertifier(id)
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.then((cert) => {
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if (!certifiers.some((c) => c.id === cert.id)) {
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certifiers = certifiers.concat(cert);
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fetchConfirmedEvents(store.dispatch);
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}
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})
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.catch((err) => {
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console.warn(`Could not fetch certifier ${id}:`, err);
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});
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});
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});
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break;
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case 'fetchCertifications':
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const { address } = action;
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if (!accounts.includes(address)) {
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accounts = accounts.concat(address);
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fetchConfirmedEvents(store.dispatch);
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}
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break;
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case 'setVisibleAccounts':
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const { addresses } = action;
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accounts = uniq(accounts.concat(addresses));
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fetchConfirmedEvents(store.dispatch);
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break;
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default:
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next(action);
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}
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};
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}
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}
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