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import { Any, Constructed, Integer, ObjectIdentifier, OctetString, Sequence, Set, verifySchema } from 'asn1js' |
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import { CONTENT_ID, FIELD_TYPE_ID, FIELD_VALUE_ID } from './constants' |
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export class ReceiptVerifier { |
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private readonly receiptSchema: Sequence |
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private readonly fieldSchema: Sequence |
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constructor() { |
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this.receiptSchema = new Sequence({ |
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value: [ |
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new ObjectIdentifier(), |
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new Constructed({ |
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idBlock: { tagClass: 3, tagNumber: 0 }, |
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value: [ |
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new Sequence({ |
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value: [ |
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new Integer(), |
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new Set({ |
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value: [ |
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new Sequence({ |
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value: [new ObjectIdentifier(), new Any()], |
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}), |
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], |
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}), |
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new Sequence({ |
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value: [ |
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new ObjectIdentifier(), |
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new Constructed({ |
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idBlock: { tagClass: 3, tagNumber: 0 }, |
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value: [new OctetString({ name: CONTENT_ID })], |
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}), |
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], |
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}), |
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], |
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}), |
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], |
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}), |
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], |
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}) |
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this.fieldSchema = new Sequence({ |
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value: [ |
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new Integer({ name: FIELD_TYPE_ID }), |
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new Integer(), |
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new OctetString({ name: FIELD_VALUE_ID }), |
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], |
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}) |
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} |
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public verifyReceiptSchema(receipt: string) { |
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const receiptVerification = verifySchema(Buffer.from(receipt, 'base64'), this.receiptSchema) |
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if (!receiptVerification.verified) { |
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throw new Error('Receipt verification failed.') |
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} |
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return receiptVerification |
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} |
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public verifyFieldSchema(sequence: Sequence) { |
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const fieldVerification = verifySchema(sequence.toBER(), this.fieldSchema) |
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if (!fieldVerification.verified) { |
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// Return null if the field schema verification fails, so we can skip the field |
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return null |
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} |
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return fieldVerification |
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} |
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} |
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tamtamchik /
app-store-receipt-parser
