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192 changes: 192 additions & 0 deletions
192
Mixin/UserInterface/Controllers/Wallet/Payment/Invoice.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,192 @@ | ||
| import Foundation | ||
| import CryptoKit | ||
| import MixinServices | ||
|
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| struct Invoice { | ||
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| enum Reference { | ||
| case hash(String) | ||
| case index(Int) | ||
| } | ||
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| struct Entry { | ||
| let traceID: String | ||
| let assetID: String | ||
| let amount: Decimal | ||
| let memo: String | ||
| let references: [Reference] | ||
| } | ||
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| let recipient: MIXAddress | ||
| let entries: [Entry] | ||
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| } | ||
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| extension Invoice { | ||
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| private enum InitError: Error { | ||
| case invalidString | ||
| case base64Decoding | ||
| case invalidLength(Int) | ||
| case invalidChecksum | ||
| case unknownVersion | ||
| case invalidRecipient | ||
| case invalidEntriesCount | ||
| case invalidEntry | ||
| case invalidReferenceType | ||
| case invalidHashReference | ||
| case invalidIndexReference | ||
| case sha3 | ||
| } | ||
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| private class DataReader { | ||
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| private let data: Data | ||
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| private var location: Data.Index | ||
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| init(data: Data) { | ||
| self.data = data | ||
| self.location = data.startIndex | ||
| } | ||
|
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| func readUInt8() -> UInt8? { | ||
| guard location != data.endIndex else { | ||
| return nil | ||
| } | ||
| let location = self.location | ||
| self.location = location.advanced(by: 1) | ||
| return data[location] | ||
| } | ||
|
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| func readUInt16() -> UInt16? { | ||
| let nextLocation = location.advanced(by: 2) | ||
| guard nextLocation <= data.endIndex else { | ||
| return nil | ||
| } | ||
| let low = data[location] | ||
| let high = data[location.advanced(by: 1)] | ||
| self.location = nextLocation | ||
| return UInt16(data: [low, high], endianess: .big) | ||
| } | ||
|
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| func readBytes(count: Int) -> Data? { | ||
| if count == 0 { | ||
| return Data() | ||
| } | ||
| let nextLocation = location.advanced(by: count) | ||
| guard nextLocation <= data.endIndex else { | ||
| return nil | ||
| } | ||
| let bytes = data[location..<nextLocation] | ||
| self.location = nextLocation | ||
| return bytes | ||
| } | ||
|
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| func readUUID() -> String? { | ||
| if let data = readBytes(count: UUID.dataCount) { | ||
| UUID(data: data).uuidString.lowercased() | ||
| } else { | ||
| nil | ||
| } | ||
| } | ||
|
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| } | ||
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| private static let version: UInt8 = 0 | ||
|
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| init(string: String) throws { | ||
| let prefix = "MIN" | ||
|
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| guard string.hasPrefix(prefix) else { | ||
| throw InitError.invalidString | ||
| } | ||
| guard let data = Data(base64URLEncoded: string.suffix(string.count - prefix.count)) else { | ||
| throw InitError.base64Decoding | ||
| } | ||
| guard data.count >= 3 + 23 + 1 else { | ||
| throw InitError.invalidLength(data.count) | ||
| } | ||
|
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| let payload = data.prefix(data.count - 4) | ||
| let expectedChecksum = data.suffix(4) | ||
| let checksum = try { | ||
| let data = prefix.data(using: .utf8)! + payload | ||
| guard let digest = SHA3_256.hash(data: data) else { | ||
| throw InitError.sha3 | ||
| } | ||
| return digest.prefix(4) | ||
| }() | ||
| guard expectedChecksum == checksum else { | ||
| throw InitError.invalidChecksum | ||
| } | ||
|
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| let reader = DataReader(data: payload) | ||
| guard reader.readUInt8() == Self.version else { | ||
| throw InitError.unknownVersion | ||
| } | ||
|
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| guard | ||
| let recipientLength = reader.readUInt16(), | ||
| let recipientData = reader.readBytes(count: Int(recipientLength)), | ||
| let recipient = MIXAddress(data: recipientData) | ||
| else { | ||
| throw InitError.invalidRecipient | ||
| } | ||
|
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| guard let entriesCount = reader.readUInt8() else { | ||
| throw InitError.invalidEntriesCount | ||
| } | ||
| var entries: [Entry] = [] | ||
| entries.reserveCapacity(Int(entriesCount)) | ||
| for _ in 0..<entriesCount { | ||
| guard | ||
| let traceID = reader.readUUID(), | ||
| let assetID = reader.readUUID(), | ||
| let amountLength = reader.readUInt8(), | ||
| let amountData = reader.readBytes(count: Int(amountLength)), | ||
| let amountString = String(data: amountData, encoding: .utf8), | ||
| let amount = Decimal(string: amountString, locale: .enUSPOSIX), | ||
| let extraLength = reader.readUInt16(), | ||
| let extra = reader.readBytes(count: Int(extraLength)), | ||
| let memo = String(data: extra, encoding: .utf8), | ||
| let referencesCount = reader.readUInt8() | ||
| else { | ||
| throw InitError.invalidEntry | ||
| } | ||
|
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| let references: [Reference] = try (0..<referencesCount).map { _ in | ||
| switch reader.readUInt8() { | ||
| case 0: | ||
| if let hash = reader.readBytes(count: 32) { | ||
| return .hash(hash.hexEncodedString()) | ||
| } else { | ||
| throw InitError.invalidHashReference | ||
| } | ||
| case 1: | ||
| if let index = reader.readUInt8(), index < entries.count { | ||
| return .index(Int(index)) | ||
| } else { | ||
| throw InitError.invalidIndexReference | ||
| } | ||
| default: | ||
| throw InitError.invalidReferenceType | ||
| } | ||
| } | ||
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| let entry = Entry( | ||
| traceID: traceID, | ||
| assetID: assetID, | ||
| amount: amount, | ||
| memo: memo, | ||
| references: references | ||
| ) | ||
| entries.append(entry) | ||
| } | ||
|
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| self.recipient = recipient | ||
| self.entries = entries | ||
| } | ||
|
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| } | ||
|
|
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