85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
/*
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ISC License
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Copyright (c) 2019, Pierre-Louis Despaigne
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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const multiC = require('multicodec');
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const { hexStringToBuffer, profiles } = require('./profiles');
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const { cidV0ToV1Base32 } = require('./helpers');
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module.exports = {
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//export some helpers functions
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helpers: {
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cidV0ToV1Base32,
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},
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/**
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* Decode a Content Hash.
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* @param {string} hash an hex string containing a content hash
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* @return {string} the decoded content
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*/
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decode: function (contentHash) {
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const buffer = hexStringToBuffer(contentHash);
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const codec = multiC.getCodec(buffer);
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const value = multiC.rmPrefix(buffer);
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let profile = profiles[codec];
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if (!profile) profile = profiles['default'];
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return profile.decode(value);
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},
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/**
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* Encode an IPFS address into a content hash
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* @param {string} ipfsHash string containing an IPFS address
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* @return {string} the resulting content hash
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*/
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fromIpfs: function (ipfsHash) {
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return this.encode('ipfs-ns', ipfsHash);
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},
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/**
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* Encode a Swarm address into a content hash
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* @param {string} swarmHash string containing a Swarm address
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* @return {string} the resulting content hash
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*/
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fromSwarm: function (swarmHash) {
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return this.encode('swarm-ns', swarmHash);
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},
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/**
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* General purpose encoding function
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* @param {string} codec
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* @param {string} value
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*/
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encode: function (codec, value) {
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let profile = profiles[codec];
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if (!profile) profile = profiles['default'];
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const encodedValue = profile.encode(value);
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return multiC.addPrefix(codec, encodedValue).toString('hex');
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},
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/**
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* Extract the codec of a content hash
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* @param {string} hash hex string containing a content hash
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* @return {string} the extracted codec
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*/
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getCodec: function (hash) {
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let buffer = hexStringToBuffer(hash);
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return multiC.getCodec(buffer);
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},
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}
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