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import * as ASN1 from 'asn1js' |
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import { RECEIPT_FIELDS_MAP, ReceiptFieldsKeyNames, ReceiptFieldsKeyValues } from './mappings' |
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import { CONTENT_ID, FIELD_TYPE_ID, FIELD_VALUE_ID, IN_APP } from './constants' |
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import { verifyFieldSchema, verifyReceiptSchema } from './verifications' |
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export type Environment = 'Production' | 'ProductionSandbox' | string |
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export type ParsedReceipt = Partial<Record<ReceiptFieldsKeyNames, string>> & { |
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ENVIRONMENT: Environment |
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IN_APP_ORIGINAL_TRANSACTION_IDS: string[] |
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IN_APP_TRANSACTION_IDS: string[] |
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} |
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class ReceiptParser { |
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private readonly parsed: ParsedReceipt |
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constructor() { |
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this.parsed = this.createInitialParsedReceipt() |
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} |
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public parseReceipt(receipt: string): ParsedReceipt { |
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const rootSchemaVerification = verifyReceiptSchema(receipt) |
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const content = rootSchemaVerification.result[CONTENT_ID] as ASN1.OctetString |
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this.parseReceiptContent(content) |
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this.validateParsedFields() |
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this.deduplicateArrayFields() |
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return this.parsed |
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} |
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private createInitialParsedReceipt(): ParsedReceipt { |
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return { |
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ENVIRONMENT: 'Production', |
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IN_APP_ORIGINAL_TRANSACTION_IDS: [], |
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IN_APP_TRANSACTION_IDS: [], |
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} |
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} |
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private parseReceiptContent(content: ASN1.OctetString): void { |
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const sequences = this.extractSequencesFromContent(content) |
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sequences.forEach(this.processSequence.bind(this)) |
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} |
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private extractSequencesFromContent(content: ASN1.OctetString): ASN1.Sequence[] { |
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const [contentSet] = content.valueBlock.value as ASN1.Set[] |
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return contentSet.valueBlock.value |
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.filter(v => v instanceof ASN1.Sequence) as ASN1.Sequence[] |
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} |
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private processSequence(sequence: ASN1.Sequence): void { |
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const verifiedSequence = verifyFieldSchema(sequence) |
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if (verifiedSequence) { |
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this.handleVerifiedSequence(verifiedSequence) |
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} |
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} |
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private handleVerifiedSequence(verifiedSequence: ASN1.CompareSchemaSuccess): void { |
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const fieldKey = (verifiedSequence.result[FIELD_TYPE_ID] as ASN1.Integer).valueBlock.valueDec |
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const fieldValue = verifiedSequence.result[FIELD_VALUE_ID] as ASN1.OctetString |
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const handler = this.getFieldHandler(fieldKey) |
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handler(fieldValue) |
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} |
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private getFieldHandler(fieldKey: number): (fieldValue: ASN1.OctetString) => void { |
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if (fieldKey === IN_APP) { |
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return this.parseReceiptContent.bind(this) |
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} |
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if (this.isValidReceiptFieldKey(fieldKey)) { |
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const name = RECEIPT_FIELDS_MAP.get(fieldKey)! |
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return (fieldValue: ASN1.OctetString) => { |
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this.addFieldToReceipt(name, this.extractStringValue(fieldValue)) |
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} |
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} |
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return () => {} |
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} |
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private isValidReceiptFieldKey(value: unknown): value is ReceiptFieldsKeyValues { |
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return typeof value === 'number' && RECEIPT_FIELDS_MAP.has(value as ReceiptFieldsKeyValues) |
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} |
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private extractStringValue(field: ASN1.OctetString): string { |
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const [fieldValue] = field.valueBlock.value |
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if (fieldValue instanceof ASN1.IA5String || fieldValue instanceof ASN1.Utf8String) { |
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return fieldValue.valueBlock.value |
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} |
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return field.toJSON().valueBlock.valueHex |
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} |
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private addFieldToReceipt(name: ReceiptFieldsKeyNames, value: string): void { |
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this.addToArrayFieldIfApplicable(name, value) |
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this.parsed[name] = value |
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} |
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private addToArrayFieldIfApplicable(name: ReceiptFieldsKeyNames, value: string): void { |
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const arrayFields: Record<string, keyof ParsedReceipt> = { |
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'IN_APP_ORIGINAL_TRANSACTION_ID': 'IN_APP_ORIGINAL_TRANSACTION_IDS', |
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'IN_APP_TRANSACTION_ID': 'IN_APP_TRANSACTION_IDS', |
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} |
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const arrayFieldName = arrayFields[name] |
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if (arrayFieldName) { |
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(this.parsed[arrayFieldName] as string[]).push(value) |
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} |
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} |
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private validateParsedFields(): void { |
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const missingFields = Array.from(RECEIPT_FIELDS_MAP.values()) |
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.filter(fieldKey => !(fieldKey in this.parsed)) |
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if (missingFields.length > 0) { |
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throw new Error(`Missing required fields: ${missingFields.join(', ')}`) |
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} |
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} |
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private deduplicateArrayFields(): void { |
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this.parsed.IN_APP_ORIGINAL_TRANSACTION_IDS = this.removeDuplicates(this.parsed.IN_APP_ORIGINAL_TRANSACTION_IDS) |
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this.parsed.IN_APP_TRANSACTION_IDS = this.removeDuplicates(this.parsed.IN_APP_TRANSACTION_IDS) |
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} |
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private removeDuplicates(array: string[]): string[] { |
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return [...new Set(array)] |
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} |
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} |
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export function parseReceipt(receipt: string): ParsedReceipt { |
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return new ReceiptParser().parseReceipt(receipt) |
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} |
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tamtamchik /
app-store-receipt-parser
