Nanostore-publisher NPM

nanostore-publisher

Publish UHRP Content with NanoStore

Overview

This package allows you to create Universal Hash Resolution Protocol (UHRP) content publications and hosting contracts for files and data. Since UHRP URLs are content-addressed, they are self-authenticating. Since any UHRP host can advertise the availability of content, discovery is no longer controlled by a trusted third party as is the case with HTTP.

Once you've uploaded, the content is available with NanoSeek, which automatically checks the integrity of the data.

Example Usage

Check out NanoStore UI to see a file upload example with React.

All the example code relies on the Babbage SDK to pay for a file to be hosted:

import { invoice, pay, upload } from 'nanostore-publisher'

// First, get "file" from an HTML file upload input.
// If you use React, get "file" from your form in the normal React-y way :)
const file = document.getElementById('upload').files[0]

// Decide how long the file is to be hosted on NanoStore.
// This is a number of minutes.
const hostingMinutes = 60 * 24 * 30 // For example, 30 days

// If not provided, the default nanostore URL is 'https://nanostore.babbage.systems'
const serverURL = 'https://nanostore.babbage.systems'

// Get an invoice for a file with this size and hosting duration
const invoice = await invoice({
  fileSize: file.size,
  retentionPeriod: hostingMinutes,
  config: {
    nanostoreURL: serverURL
  }
})

// Automatically pay the invoice with the Babbage SDK
const pay = await pay({
  config: {
    nanostoreURL: serverURL
  },
  description: 'NanoStore Publisher Example', // Shown to the Babbage user
  orderID: invoice.ORDER_ID,
  recipientPublicKey: invoice.identityKey,
  amount: invoice.amount // This is the cost in satoshis
})

// After the payment, the file can be uploaded to NanoStore
const upload = await upload({
  config: {
    nanostoreURL: serverURL
  },
  uploadURL: pay.uploadURL,
  publicURL: invoice.publicURL,
  file,
  serverURL,
  onUploadProgress: prog => { // You can get progress updates
    console.log(
      'Progress:',
      parseInt((prog.loaded / prog.total) * 100)
    )
  }
})

// You'll get the UHRP hash and the public URL after upload
console.log({
  hash: upload.hash,
  publicURL: upload.publicURL
})

Invoice, Pay and Upload

As you can see in the above code, there are three phases to the publication of content with this library. First, an invoice is created where you specify the file size and the retention period of the content you are uploading. Then, you pay for the content, and finally, the content is uploaded to NanoStore.

Here's a more customized example. We've separated the "pay" phase into its derivePaymentInfo and submitPayment component parts, allowing for a custom transaction to be constructed. This is useful if, for example, there is a need for multiple outputs going to different places:

import [ invoice, derivePaymentInfo, submitPayment, upload ] from 'nanostore-publisher'
import { createAction } from '@babbage/sdk-ts'

// Create an invoice, like normal
const invoice = await invoice({
  fileSize: file.size,
  retentionPeriod: 86400
})

// Get the information needed for making the payment
const paymentInfo = await derivePaymentInfo({
  recipientPublicKey: invoice.identityKey,
  amount: invoice.amount // This is the cost in satoshis
})

// Create a custom transaction, potentially with other outputs
const payment = await createAction({
  description: 'Custom payment',
  outputs: [
    { script: '016a', satoshis: 1 }, // ...custom outputs
    paymentInfo.output               // payment output
  ]
})

// Submit the payment after the transaction is complete
const payment = await submitPayment({
  orderID: invoice.ORDER_ID,
  amount: invoice.amount,
  payment,
  derivationPrefix: paymentInfo.derivationPrefix,
  derivationSuffix: paymentInfo.derivationSuffix,
  vout: 1 // The payment output was at index 1 in the outputs array
})

// Upload the file as normal
const upload = await upload({
  uploadURL: pay.uploadURL,
  publicURL: invoice.publicURL,
  file
})

Note, in the above example, that the two low-level payment functions replace the high-level pay function.

Simplified File Publishing

If you simply want to publish a single file with default behavior, you can make use of the publishFile function.

Example Usage in a React UI

 // Publish the uploaded file
const uploadResult = await publishFile({
  file,
  retentionPeriod,
  progressTracker: prog => {
    setUploadProgress(
      parseInt((prog.loaded / prog.total) * 100)
    )
  }
})

// Show the results in the UI
setResults({
  hash: uploadResult.hash,
  publicURL: uploadResult.publicURL
})

API

invoice

Creates an invoice for a NanoStore file hosting contract.

Parameters

obj Object All parameters are given in an object. (optional, default {})
- obj.config Object config object, see config section. (optional, default CONFIG)
- obj.fileSize Number The size of the file you want to host in bytes.
- obj.retentionPeriod Number The whole number of minutes you want the file to be hosted for.

Returns Promise [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) The invoice object, containing message giving details, identityKey recipient's private key, amount (satoshis), ORDER_ID, for referencing this contract payment and passed to the upload function. The object also contains publicURL, which is the HTTP URL where the file will become available for the duration of the contract once uploaded and the status.

derivePaymentInfo

Derives an output to pay for the NanoStore file hosting contract. After payment, use submitPayment to complete the payment process and get an upload URL.

Parameters

obj Object All parameters are given in an object. (optional, default {})
- obj.recipientPublicKey String Public key of the host receiving the payment.
- obj.amount Number The number of satoshis being paid.
- obj.config (optional, default CONFIG)

Returns Promise [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) The output object, contains the script and the amount of satoshis'.

submitPayment

Submit a manually-created payment for NanoStore hosting. Obtain an output that must be included in the transaction by using derivePaymentInfo, and then provide the Everett envelope for the transaction here. Also use the vout parameter to specify which output in your transaction has paid the invoice.

Parameters

obj Object All parameters are given in an object. (optional, default {})
- obj.config Object config object, see config section. (optional, default CONFIG)
- obj.orderID String The hosting invoice reference.
- obj.amount Number The number of satoshis being paid.
- obj.payment Object The result of calling createAction which incorporates the payment output for the NanoStore hosting. Object that includes inputs, mapiResponses, rawTx.
- obj.vout Number The output from the Action which corresponds to the payment for NanoStore hosting
- obj.derivationPrefix String The value returned from derivePaymentInfo
- obj.derivationSuffix String The value returned from derivePaymentInfo

Returns Promise [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) The paymentResult object, contains the uploadURL and the publicURL and the status'.

pay

High-level function to automatically pay an invoice, using a Babbage SDK createAction call.

Parameters

obj Object All parameters are given in an object. (optional, default {})
- obj.config Object config object, see config section. (optional, default CONFIG)
- obj.description String The description to be used for the payment.
- obj.orderID String The hosting invoice reference.
- obj.recipientPublicKey String Public key of the host receiving the payment.
- obj.amount Number The number of satoshis being paid.

Returns Promise [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) The pay object, contains the uploadURL and the publicURL and the status'.

upload

Uploads a file to NanoStore and pays an invoice, thereby starting the file hosting contract.

Parameters

obj Object? All parameters are given in an object. (optional, default {})
- obj.uploadURL String? The external URL where the file is uploaded to host it.
- obj.publicURL String? The public URL where the file can be downloaded from.
- obj.file (File | object)? The file to upload. This is usually obtained by querying for your HTML form's file upload <input /> tag and referencing tagElement.files[0]. Or using custom object as defined in publishFile.js
- obj.serverURL String The URL of the NanoStore server to contract with. By default, the Babbage NanoStore server is used. (optional, default https://nanostore.babbage.systems)
- obj.onUploadProgress Function? A function called with periodic progress updates as the file uploads (optional, default ()=>{})
- obj.config (optional, default CONFIG)

Returns Promise [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) The publication object. Fields are published=true, hash (the UHRP URL of the new file), and publicURL, the HTTP URL where the file is published.

publishFile

High-level function to automatically pay an invoice, using a Babbage SDK createAction call, or a clientPrivateKey when in a server environment.

Parameters

obj Object All parameters are given in an object. (optional, default {})
- obj.config Object config object, see config section. (optional, default CONFIG)
- obj.file (File | object) the File to upload given as File or custom object with the necessary data params (see below)
- obj.retentionPeriod number how long the file should be retained
- obj.progressTracker function function to provide updates on upload progress (optional, default ()=>{})

Returns Promise [Object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) The upload object, contains the hash and the publicURL and the status'.

// Example compatible File object for publishing file data from a Buffer
const fileToUpload = {
  dataAsBuffer,
  size: dataAsBuffer.length,
  type: 'image/png' // use 'mime' to determine file type
}