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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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const uniqueArrayValues = (array: string[]) => Array.from(new Set(array)) |
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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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function isReceiptFieldKey (value: unknown): value is ReceiptFieldsKeyValues { |
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return Boolean(typeof value === 'number' && RECEIPT_FIELDS_MAP.has(value as ReceiptFieldsKeyValues)) |
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} |
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function isParsedReceiptContentComplete (data: 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 extractFieldValue (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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function appendField (parsed: ParsedReceipt, name: ReceiptFieldsKeyNames, value: string) { |
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if (name === 'IN_APP_ORIGINAL_TRANSACTION_ID') { |
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parsed.IN_APP_ORIGINAL_TRANSACTION_IDS.push(value) |
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} |
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if (name === 'IN_APP_TRANSACTION_ID') { |
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parsed.IN_APP_TRANSACTION_IDS.push(value) |
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} |
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parsed[name] = value |
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} |
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function processField (parsed: ParsedReceipt, fieldKey: number, fieldValue: ASN1.OctetString) { |
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if (fieldKey === IN_APP) { |
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parseOctetStringContent(parsed, 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 name = RECEIPT_FIELDS_MAP.get(fieldKey)! |
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appendField(parsed, name, extractFieldValue(fieldValue)) |
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} |
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function parseOctetStringContent (parsed: ParsedReceipt, content: ASN1.OctetString) { |
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const [contentSet] = content.valueBlock.value as ASN1.Set[] |
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const contentSetSequences = contentSet.valueBlock.value |
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.filter(v => v instanceof ASN1.Sequence) as ASN1.Sequence[] |
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for (const sequence of contentSetSequences) { |
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const verifiedSequence = verifyFieldSchema(sequence) |
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if (verifiedSequence) { |
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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 ASN1.Integer).valueBlock.valueDec |
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const fieldValueOctetString = verifiedSequence.result[FIELD_VALUE_ID] as ASN1.OctetString |
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processField(parsed, fieldKey, fieldValueOctetString) |
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} |
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} |
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} |
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function postprocessParsedReceipt (parsed: ParsedReceipt) { |
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parsed.IN_APP_ORIGINAL_TRANSACTION_IDS = uniqueArrayValues(parsed.IN_APP_ORIGINAL_TRANSACTION_IDS) |
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parsed.IN_APP_TRANSACTION_IDS = uniqueArrayValues(parsed.IN_APP_TRANSACTION_IDS) |
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} |
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export function 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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const parsed: ParsedReceipt = { |
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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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parseOctetStringContent(parsed, content) |
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// Verify if the parsed content contains all the required fields |
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if (!isParsedReceiptContentComplete(parsed)) { |
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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 parsed)) { |
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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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postprocessParsedReceipt(parsed) |
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return parsed as ParsedReceipt |
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} |
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tamtamchik /
app-store-receipt-parser
