@ethersphere/bee-js/dist/mjs/stamper/stamper.js

Javascript client for Bee

import { Binary } from 'cafe-utility';
import { BatchId, PrivateKey } from "../utils/typed-bytes.js";
export class Stamper {
  constructor(signer, batchId, buckets, depth) {
    this.signer = new PrivateKey(signer);
    this.batchId = new BatchId(batchId);
    this.buckets = buckets;
    this.depth = depth;
    this.maxSlot = 2 ** (this.depth - 16);
  }
  static fromBlank(signer, batchId, depth) {
    return new Stamper(signer, batchId, new Uint32Array(65536), depth);
  }
  static fromState(signer, batchId, buckets, depth) {
    return new Stamper(signer, batchId, buckets, depth);
  }
  stamp(chunk) {
    const address = chunk.hash();
    const bucket = Binary.uint16ToNumber(address, 'BE');
    const height = this.buckets[bucket];
    if (height >= this.maxSlot) {
      throw Error('Bucket is full');
    }
    this.buckets[bucket]++;
    const index = Binary.concatBytes(Binary.numberToUint32(bucket, 'BE'), Binary.numberToUint32(height, 'BE'));
    const timestamp = Binary.numberToUint64(BigInt(Date.now()), 'BE');
    const signature = this.signer.sign(Binary.concatBytes(address, this.batchId.toUint8Array(), index, timestamp));
    return {
      batchId: this.batchId,
      index,
      issuer: this.signer.publicKey().address().toUint8Array(),
      signature: signature.toUint8Array(),
      timestamp
    };
  }
  getState() {
    return this.buckets;
  }
}