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import { fromBER } from 'asn1js' |
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interface Block { |
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blockName: string |
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valueBlock: { |
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valueHex?: string |
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value?: Block[] | string |
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} |
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} |
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export interface TransactionIds { |
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transactionIds: string[] |
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originalTransactionIds: string[] |
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} |
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/** |
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* Parses a receipt string and extracts the transaction IDs from it. |
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* Warning! This class does not validate the receipt string, only extracts them. |
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*/ |
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export class ReceiptParser { |
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constructor (private readonly receiptString: string) {} |
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static getTransactionIdsFromBlock (block: Block): TransactionIds | null { |
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const { valueBlock } = block |
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if (!valueBlock || !Array.isArray(valueBlock.value)) { |
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return null |
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} |
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if (valueBlock.value.length === 3) { |
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const result = this.extractTransactionIds(valueBlock.value) |
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if (result) return result |
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} |
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const result: TransactionIds = { transactionIds: [], originalTransactionIds: [] } |
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for (const innerBlock of valueBlock.value) { |
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const innerIds = this.getTransactionIdsFromBlock(innerBlock) |
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if (innerIds) { |
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result.transactionIds.push(...innerIds.transactionIds) |
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result.originalTransactionIds.push(...innerIds.originalTransactionIds) |
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} |
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} |
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// Deduplicate the IDs |
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result.transactionIds = [...new Set(result.transactionIds)] |
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result.originalTransactionIds = [...new Set(result.originalTransactionIds)] |
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return result |
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} |
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static getTransactionIdsFromReceiptString (receiptString: string): TransactionIds | null { |
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const { result } = fromBER(Buffer.from(receiptString, 'base64')) |
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if (result.error) { |
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throw new Error(`Error parsing receipt: ${result.error}`) |
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} |
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return this.getTransactionIdsFromBlock(result.toJSON() as Block) |
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} |
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/** |
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* The transaction ID is encoded as an INTEGER with the value 0x06a7 |
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*/ |
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private static isTransactionIdBlock (block: Block): boolean { |
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return block.blockName === 'INTEGER' && block.valueBlock.valueHex === '06a7' |
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} |
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/** |
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* The original transaction ID is encoded as an INTEGER with the value 0x06a9 |
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*/ |
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private static isOriginalTransactionIdBlock (block: Block): boolean { |
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return block.blockName === 'INTEGER' && block.valueBlock.valueHex === '06a9' |
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} |
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private static extractIdFromBlock (block: Block): string | null { |
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if (!Array.isArray(block.valueBlock.value)) { |
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return null |
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} |
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// The transaction ID is encoded as an OCTET STRING containing a UTF8String |
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if (block.blockName === 'OCTET STRING' && block.valueBlock.value[0].blockName === 'UTF8String') { |
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return block.valueBlock.value[0].valueBlock.value as string |
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} |
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return null |
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} |
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private static extractTransactionIds (blocks: Block[]): TransactionIds | null { |
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const [firstBlock, , lastBlock] = blocks |
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const result: TransactionIds = { transactionIds: [], originalTransactionIds: [] } |
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if (this.isTransactionIdBlock(firstBlock)) { |
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const id = this.extractIdFromBlock(lastBlock) |
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if (id) result.transactionIds.push(id) |
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} else if (this.isOriginalTransactionIdBlock(firstBlock)) { |
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const id = this.extractIdFromBlock(lastBlock) |
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if (id) result.originalTransactionIds.push(id) |
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} else { |
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return null |
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} |
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return result |
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} |
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getTransactionIds (): TransactionIds | null { |
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return ReceiptParser.getTransactionIdsFromReceiptString(this.receiptString) |
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} |
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} |
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tamtamchik /
app-store-receipt-parser
