openethereum/js/src/shared/contracts/badgereg.js

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity 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 of the License, or
// (at your option) any later version.
// Parity 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 Parity. If not, see <http://www.gnu.org/licenses/>.
import { bytesToHex, hexToAscii } from '~/api/util/format';
import ABI from './abi/certifier.json';
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const ZERO20 = '0x0000000000000000000000000000000000000000';
const ZERO32 = '0x0000000000000000000000000000000000000000000000000000000000000000';
export default class BadgeReg {
constructor (api, registry) {
this._api = api;
this._registry = registry;
registry.getContract('badgereg');
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this.certifiers = []; // by id
this.contracts = {}; // by name
}
getContract () {
return this._registry.getContract('badgereg');
}
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certifierCount () {
return this
.getContract()
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.then((badgeReg) => {
return badgeReg.instance.badgeCount.call({}, [])
.then((count) => count.valueOf());
});
}
fetchCertifier (id) {
if (this.certifiers[id]) {
return Promise.resolve(this.certifiers[id]);
}
return this
.getContract()
.then((badgeReg) => {
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return badgeReg.instance.badge.call({}, [ id ]);
})
.then(([ address, name ]) => {
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if (address === ZERO20) {
throw new Error(`Certifier ${id} does not exist.`);
}
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name = bytesToHex(name);
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name = name === ZERO32
? null
: hexToAscii(name);
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return this.fetchMeta(id)
.then(({ title, icon }) => {
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const data = { address, id, name, title, icon };
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this.certifiers[id] = data;
return data;
});
});
}
fetchCertifierByName (name) {
return this
.getContract()
.then((badgeReg) => {
return badgeReg.instance.fromName.call({}, [ name ]);
})
.then(([ id, address, owner ]) => {
if (address === ZERO20) {
throw new Error(`Certifier ${name} does not exist.`);
}
return this.fetchMeta(id)
.then(({ title, icon }) => {
const data = { address, id, name, title, icon };
this.certifiers[id] = data;
return data;
});
});
}
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fetchMeta (id) {
return this
.getContract()
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.then((badgeReg) => {
return Promise.all([
badgeReg.instance.meta.call({}, [id, 'TITLE']),
badgeReg.instance.meta.call({}, [id, 'IMG'])
]);
})
.then(([ title, icon ]) => {
title = bytesToHex(title);
title = title === ZERO32 ? null : hexToAscii(title);
if (bytesToHex(icon) === ZERO32) {
icon = null;
}
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return { title, icon };
});
}
checkIfCertified (certifier, address) {
if (!this.contracts[certifier]) {
this.contracts[certifier] = this._api.newContract(ABI, certifier);
}
const contract = this.contracts[certifier];
return contract.instance.certified.call({}, [address]);
}
}