openethereum/js/packages/dapp-web/dapplink.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 base32 from 'base32.js';
import { DOMAIN } from '@parity/shared/util/constants';
const BASE_URL = `.web${DOMAIN}`;
const ENCODER_OPTS = { type: 'crockford' };
export function encodePath (token, url) {
const encoder = new base32.Encoder(ENCODER_OPTS);
const chars = `${token}+${url}`
.split('')
.map((char) => char.charCodeAt(0));
return encoder
.write(chars) // add the characters to encode
.finalize(); // create the encoded string
}
export function encodeUrl (token, url) {
const encoded = encodePath(token, url)
.match(/.{1,63}/g) // split into 63-character chunks, max length is 64 for URLs parts
.join('.'); // add '.' between URL parts
return `${encoded}${BASE_URL}`;
}
// TODO: This export is really more a helper along the way of verifying the actual
// encoding (being able to decode test values from the node layer), than meant to
// be used as-is. Should the need arrise to decode URLs as well (instead of just
// producing), it would make sense to further split the output into the token/URL
export function decode (encoded) {
const decoder = new base32.Decoder(ENCODER_OPTS);
const sanitized = encoded
.replace(BASE_URL, '') // remove the BASE URL
.split('.') // split the string on the '.' (63-char boundaries)
.join(''); // combine without the '.'
return decoder
.write(sanitized) // add the string to decode
.finalize() // create the decoded buffer
.toString(); // create string from buffer
}
export {
BASE_URL
};