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1//
2// DataDecodingStrategy.swift
3// URLQueryItemCoder
4//
5// Created by Kyle Hughes on 4/8/23.
6//
7
8import Foundation
9
10/// The strategy to use for decoding `Data` values.
11public enum DataDecodingStrategy {
12 /// Decode the `Data` from a Base64-encoded string.
13 ///
14 /// This is the default strategy.
15 case base64
16
17 /// Decode the `Data` as a custom value decoded by the given closure.
18 case custom(@Sendable (Decoder) throws -> Data)
19
20 /// Defer to `Data` for decoding.
21 case deferredToData
22
23 // MARK: Public Static Interface
24
25 /// The default decoding strategy.
26 ///
27 /// Equals `.base64`.
28 public static let `default`: Self = .base64
29
30 // MARK: Internal Instance Interface
31
32 internal func decode<PrimitiveValue>(insideOf lowLevelDecoder: LowLevelDecoder<PrimitiveValue>) throws -> Data {
33 switch self {
34 case .base64:
35 switch lowLevelDecoder.container {
36 case .multiValue:
37 throw DecodingError.dataCorrupted(
38 DecodingError.Context(
39 codingPath: lowLevelDecoder.codingPath,
40 debugDescription: "Expected data to be encoded as a single value conatiner."
41 )
42 )
43 case let .singleValue(singleValueContainer):
44 let stringValue = try singleValueContainer.decode(String.self)
45
46 guard let data = Data(base64Encoded: stringValue) else {
47 throw DecodingError.dataCorrupted(
48 DecodingError.Context(
49 codingPath: singleValueContainer.codingPath,
50 debugDescription: "Data unable to be decoded from base64 string."
51 )
52 )
53 }
54
55 return data
56 }
57 case let .custom(closure):
58 return try closure(lowLevelDecoder)
59 case .deferredToData:
60 return try Data(from: lowLevelDecoder)
61 }
62 }
63}