content-hash

This is a simple package made for encoding and decoding content hashes as specified in the EIP 1577. This package will be useful for every Ethereum developer wanting to interact with EIP 1577 compliant ENS resolvers.

🔠 Supported Codec

• swarm
• ipfs
• ipns
• onion
• onion3
• skynet
• arweave

📥 Install

npm install @ensdomains/content-hash

🛠 Usage

import { decode } from "@ensdomains/content-hash";

const encoded =
  "e3010170122029f2d17be6139079dc48696d1f582a8530eb9805b561eda517e22a892c7e3f1f";

const content = decode(encoded);
// 'QmRAQB6YaCyidP37UdDnjFY5vQuiBrcqdyoW1CuDgwxkD4'

📕 API

All hex string inputs can be prefixed with 0x, but it's not mandatory.

⚠️ All outputs are NOT prefixed with 0x

decode( contentHash ) -> string

This function takes a content hash as a hex string and returns the decoded content as a string.

import { decode } from "@ensdomains/content-hash";

const encoded =
  "e3010170122029f2d17be6139079dc48696d1f582a8530eb9805b561eda517e22a892c7e3f1f";

const content = decode(encoded);
// 'QmRAQB6YaCyidP37UdDnjFY5vQuiBrcqdyoW1CuDgwxkD4'

encode( codec, value) -> string

This function takes a supported codec as a string and a value as a string and returns coresponding content hash as a hex string.

import { encode } from "@ensdomains/content-hash";

const onion = "zqktlwi4fecvo6ri";

const encoded = encode("onion", onion);
// 'bc037a716b746c776934666563766f367269'

getCodec( contentHash ) -> string

This function takes a content hash as a hex string and returns the codec as a hex string.

import { getCodec } from "@ensdomains/content-hash";

const encoded =
  "e40101701b20d1de9994b4d039f6548d191eb26786769f580809256b4685ef316805265ea162";

const codec = getCodec(encoded);
// 'swarm'

Helpers

• cidV0ToV1Base32( ipfsHash ) -> string

  This function takes an ipfsHash and converts it to a CID v1 encoded in base32.

  import { cidV0ToV1Base32 } from "@ensdomains/content-hash";
  
  const ipfs = "QmYwAPJzv5CZsnA625s3Xf2nemtYgPpHdWEz79ojWnPbdG";
  
  const cidV1 = cidV0ToV1Base32(ipfs);
  // 'bafybeibj6lixxzqtsb45ysdjnupvqkufgdvzqbnvmhw2kf7cfkesy7r7d4'

• cidForWeb( ipfsHash ) -> string

  This function takes any ipfsHash and converts it to DNS-compatible CID.

  import { cidForWeb } from "@ensdomains/content-hash";
  
  const ipfs = "QmYwAPJzv5CZsnA625s3Xf2nemtYgPpHdWEz79ojWnPbdG";
  
  const cidV1 = cidForWeb(ipfs);
  // 'bafybeibj6lixxzqtsb45ysdjnupvqkufgdvzqbnvmhw2kf7cfkesy7r7d4'

📝 License

This project is licensed under the MIT License, you can find it here.

Note that the dependencies may have a different License

👥 Acknowledgements

This repo is forked from the original content-hash library, which was written by pldespaigne.