js-ipld-url-resolve

Resolver for IPLD URLs based on the js-IPFS DAG API. supports advanced features like schemas and escaping

Features:

• Traverse IPLD URLs
• Support special character escaping in path segments (e.g. '/')
• Support for IPLD URL path segment parameter syntax using ;
• Support IPLD Schemas as lenses during traversal
• Resolve Links during traversal of schemas
  • Struct fields
  • Map values
  • List values
  • Union types
  • Links deeply nested within structs/maps
• ADL Registry for schema parameter to convert nodes
• Patch support
  • Over plain nodes
  • Over schema'd nodes
  • Over ADLs

API

import { IPLDURLSystem } from 'js-ipld-url-resolve'

// You map provide an optional map of ADLs to use
const adls = new Map()

// This ADL will asynchronously stringify any data into a JSON string
// It's kinda useless, but you can make ADLs that return any JS object
// Whose properties can be getters that reuturn Promises that will get
// Automatically awaited during traversal.
// The `parameters` are the IPLDURL parameters for that node's segment
// Parameters might also be coming from the querystring if it's the root
adls.set('example', async (node, parameters, system) => JSON.stringify(node))

async function getNode(cid) {
    const {value} = ipfs.dag.get(cid)
    return value
}

const system = new IPLDURLSystem({
  getNode,
  adls
})

// Resolve some data from an IPLD URL
const data = await system.resolve('ipld://some_cid/some_path;schema=schema_cid;type=SchemaTypeName/plainpath/?adl=example')