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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | 33x 33x 33x 2x 2x 2x 2x 2x 1x 1x 3x 3x 3x 3x 1x 2x 2x 2x 2x 2x 1x | import { Binary, Chunk } from 'cafe-utility'
import { EnvelopeWithBatchId } from '../types'
import { BatchId, PrivateKey } from '../utils/typed-bytes'
export class Stamper {
signer: PrivateKey
batchId: BatchId
buckets: Uint32Array
depth: number
maxSlot: number
private constructor(
signer: PrivateKey | Uint8Array | string,
batchId: BatchId | Uint8Array | string,
buckets: Uint32Array,
depth: number,
) {
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: PrivateKey | Uint8Array | string, batchId: BatchId | Uint8Array | string, depth: number) {
return new Stamper(signer, batchId, new Uint32Array(65536), depth)
}
static fromState(
signer: PrivateKey | Uint8Array | string,
batchId: BatchId | Uint8Array | string,
buckets: Uint32Array,
depth: number,
) {
return new Stamper(signer, batchId, buckets, depth)
}
stamp(chunk: Chunk): EnvelopeWithBatchId {
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(): Uint32Array {
return this.buckets
}
}
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