ipfs-only-hash

ipfs-only-hash

Just enough code to calculate the IPFS hash for some data

Calculate the IPFS hash for some data without having to install or run an IPFS node.

Install

npm i ipfs-only-hash

Usage

const Hash = require('ipfs-only-hash')
const data = Buffer.from('hello world!')
const hash = await Hash.of(data)
console.log(hash) // QmTp2hEo8eXRp6wg7jXv1BLCMh5a4F3B7buAUZNZUu772j

API

Hash.of(input, [options]) -> Promise<String>

Calculate the hash for the provided input.

• input (Buffer|Iterable<Buffer>): The input bytes to calculate the IPFS hash for. Note that Node.js readable streams are iterable!
• options (Object): Optional options:
  • chunker (string, defaults to "fixed"): the chunking strategy. Supports:
    • fixed
    • rabin
  • chunkerOptions (object, optional): the options for the chunker. Defaults to an object with the following properties:
    • avgChunkSize (positive integer, defaults to 262144): the average chunk size (rabin chunker only)
    • minChunkSize (positive integer): the minimum chunk size (rabin chunker only)
    • maxChunkSize (positive integer, defaults to 262144): the maximum chunk size
  • strategy (string, defaults to "balanced"): the DAG builder strategy name. Supports:
    • flat: flat list of chunks
    • balanced: builds a balanced tree
    • trickle: builds a trickle tree
  • maxChildrenPerNode (positive integer, defaults to 174): the maximum children per node for the balanced and trickle DAG builder strategies
  • layerRepeat (positive integer, defaults to 4): (only applicable to the trickle DAG builder strategy). The maximum repetition of parent nodes for each layer of the tree.
  • reduceSingleLeafToSelf (boolean, defaults to true): optimization for, when reducing a set of nodes with one node, reduce it to that node.
  • hashAlg (string, defaults to 'sha2-256'): multihash hashing algorithm to use
  • cidVersion (integer, default 0): the CID version to use when storing the data (storage keys are based on the CID, including it's version)
  • rawLeaves (boolean, defaults to false): When a file would span multiple DAGNodes, if this is true the leaf nodes will not be wrapped in UnixFS protobufs and will instead contain the raw file bytes
  • leafType (string, defaults to 'file') what type of UnixFS node leaves should be - can be 'file' or 'raw' (ignored when rawLeaves is true)

Contribute

Feel free to dive in! Open an issue or submit PRs.

License

MIT © Alan Shaw