54 lines
1.5 KiB
TypeScript
54 lines
1.5 KiB
TypeScript
// Copyright 2017-2024 @polkadot/react-params authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { PalletAllianceCid } from '@polkadot/types/lookup';
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import type { ExpandedCid } from './types.js';
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import { CID, digest, varint } from 'multiformats';
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import { u8aToHex } from '@polkadot/util';
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export function fromIpfsCid (cid: string): ExpandedCid | null {
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try {
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const { code: codec, multihash: { code, digest }, version } = CID.parse(cid);
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return {
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codec,
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hash: {
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code,
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digest: u8aToHex(digest)
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},
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version
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};
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} catch (error) {
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console.error(`fromIpfsCid: ${(error as Error).message}::`, cid);
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return null;
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}
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}
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export function toIpfsCid (cid: PalletAllianceCid): string | null {
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try {
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const { codec, hash_: { code, digest: _bytes }, version } = cid;
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// Since we use parse, encode into a fully-specified bytes to
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// pass - <varint code> + <varint length> + bytes
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const bytes = _bytes.toU8a(true);
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const codeLen = varint.encodingLength(code.toNumber());
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const sizeLen = varint.encodingLength(bytes.length);
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const encoded = new Uint8Array(codeLen + sizeLen + bytes.length);
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varint.encodeTo(code.toNumber(), encoded, 0);
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varint.encodeTo(bytes.length, encoded, codeLen);
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encoded.set(bytes, codeLen + sizeLen);
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return CID
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.create(version.index as 0, codec.toNumber(), digest.decode(encoded))
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.toString();
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} catch (error) {
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console.error(`toIpfsCid: ${(error as Error).message}::`, cid.toHuman());
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return null;
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}
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}
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