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import * as ASN1JS from 'asn1js' |
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import { RECEIPT_FIELDS_MAP, ReceiptFieldsKeys, ReceiptFieldsValues } from './mappings' |
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import { CONTENT_ID, FIELD_TYPE_ID, FIELD_VALUE_ID, IN_APP } from './constants' |
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import { rootSchema } from './root.schema' |
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import { fieldSchema } from './field.schema' |
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export type ParsedReceipt = Record<ReceiptFieldsValues, string> & { |
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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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function isReceiptFieldKey (value: unknown): value is ReceiptFieldsKeys { |
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return Boolean(value && typeof value === 'number' && RECEIPT_FIELDS_MAP.has(value as ReceiptFieldsKeys)) |
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} |
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function isParsedReceiptContentComplete (data: Partial<ParsedReceipt>): data is ParsedReceipt { |
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for (const fieldKey of RECEIPT_FIELDS_MAP.values()) { |
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if (!(fieldKey in data)) { |
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return false |
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} |
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} |
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return true |
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} |
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function extractValue (field: ASN1JS.OctetString): string { |
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const [fieldValue] = field.valueBlock.value |
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if (fieldValue instanceof ASN1JS.IA5String || fieldValue instanceof ASN1JS.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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function processField (parsedContent: Partial<ParsedReceipt>, fieldKey: number, fieldValue: ASN1JS.OctetString) { |
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if (fieldKey === IN_APP) { |
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parseOctetStringContent(parsedContent, fieldValue) |
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return |
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} |
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if (!isReceiptFieldKey(fieldKey)) { |
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return |
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} |
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const parsedReceiptContentFieldKey = RECEIPT_FIELDS_MAP.get(fieldKey)! |
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const value = extractValue(fieldValue) |
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parsedContent[parsedReceiptContentFieldKey] = value |
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if (parsedReceiptContentFieldKey === 'IN_APP_ORIGINAL_TRANSACTION_ID') { |
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parsedContent.IN_APP_ORIGINAL_TRANSACTION_IDS = Array.from( |
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new Set([...parsedContent.IN_APP_ORIGINAL_TRANSACTION_IDS || [], value]) |
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) |
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} |
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if (parsedReceiptContentFieldKey === 'IN_APP_TRANSACTION_ID') { |
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parsedContent.IN_APP_TRANSACTION_IDS = Array.from( |
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new Set([...parsedContent.IN_APP_TRANSACTION_IDS || [], value]) |
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) |
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} |
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} |
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function parseOctetStringContent (parsedContent: Partial<ParsedReceipt>, content: ASN1JS.OctetString) { |
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const [contentSet] = content.valueBlock.value as ASN1JS.Set[] |
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const contentSetSequences = contentSet.valueBlock.value |
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.filter(v => v instanceof ASN1JS.Sequence) as ASN1JS.Sequence[] |
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for (const sequence of contentSetSequences) { |
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const verifiedSequence = ASN1JS.verifySchema(sequence.toBER(), fieldSchema) |
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// The schema does not follow content field schema structure, so we cannot extract the field type and value |
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if (!verifiedSequence.verified) { |
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continue |
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} |
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// We are confident to use "as" assertion because Integer type is guaranteed by positive verification above |
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const fieldKey = (verifiedSequence.result[FIELD_TYPE_ID] as ASN1JS.Integer).valueBlock.valueDec |
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const fieldValueOctetString = verifiedSequence.result[FIELD_VALUE_ID] as ASN1JS.OctetString |
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processField(parsedContent, fieldKey, fieldValueOctetString) |
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} |
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} |
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export function parseReceipt (receipt: string): ParsedReceipt { |
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const rootSchemaVerification = ASN1JS.verifySchema(Buffer.from(receipt, 'base64'), rootSchema) |
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if (!rootSchemaVerification.verified) { |
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throw new Error('Root schema verification failed') |
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} |
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const parsedContent: Partial<ParsedReceipt> = {} |
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const content = rootSchemaVerification.result[CONTENT_ID] as ASN1JS.OctetString |
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parseOctetStringContent(parsedContent, content) |
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// Verify if the parsed content contains all the required fields |
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if (!isParsedReceiptContentComplete(parsedContent)) { |
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const missingProps = [] |
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for (const fieldKey of RECEIPT_FIELDS_MAP.values()) { |
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if (!(fieldKey in parsedContent)) { |
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missingProps.push(fieldKey) |
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} |
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} |
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throw new Error(`Missing required fields: ${missingProps.join(', ')}`) |
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} |
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1 |
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return parsedContent as ParsedReceipt |
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} |
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tamtamchik /
app-store-receipt-parser
