@lidofinance/lido-ethereum-sdk/dist/esm/stvault/utils/ipfs.js

<div style="display: flex;" align="center"> <h1 align="center">Lido Ethereum SDK</h1> </div>

import { CID } from 'multiformats/cid';
import { MemoryBlockstore } from 'blockstore-core';
import { importer } from 'ipfs-unixfs-importer';
export const IPFS_GATEWAY = 'https://ipfs.io/ipfs';
export const fetchIPFS = async (args) => {
    const { cid, gateway = IPFS_GATEWAY } = args;
    const { json } = await fetchIPFSVerify(cid, gateway);
    return json;
};
// Fetching buffer content by CID through IPFS gateway
export const fetchIPFSBuffer = async (args) => {
    const { cid, gateway = IPFS_GATEWAY } = args;
    const ipfsUrl = `${gateway}/${cid}`;
    const response = await fetch(ipfsUrl);
    if (!response.ok) {
        throw new Error(`Failed to fetch IPFS content: ${response.statusText}`);
    }
    const buffer = await response.arrayBuffer();
    return new Uint8Array(buffer);
};
// Recalculate CID using full UnixFS logic (like `ipfs add`)
export const calculateIPFSAddCID = async (fileContent) => {
    const blockstore = new MemoryBlockstore();
    const entries = importer([{ content: fileContent }], blockstore, {
        cidVersion: 0,
        rawLeaves: false, // important! otherwise CID will be v1
    });
    let lastCid = null;
    for await (const entry of entries) {
        lastCid = entry.cid;
    }
    if (!lastCid) {
        throw new Error('CID calculation failed — no entries found');
    }
    return lastCid;
};
// Downloading file from IPFS and checking its integrity
export const fetchIPFSVerify = async (cid, gateway = IPFS_GATEWAY) => {
    const originalCID = CID.parse(cid);
    const fileContent = await fetchIPFSBuffer({ cid, gateway });
    const calculatedCID = await calculateIPFSAddCID(fileContent);
    if (!calculatedCID.equals(originalCID)) {
        throw new Error(`❌ CID mismatch! Expected ${originalCID}, but got ${calculatedCID}`);
    }
    const json = JSON.parse(new TextDecoder().decode(fileContent));
    return {
        fileContent,
        json,
    };
};
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