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expose decoding strategy of JSONDecoder for claims #122

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expose decoding strategy of JSONDecoder for claims #122

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38 changes: 37 additions & 1 deletion Sources/SwiftJWT/JWTDecoder.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,10 @@ public class JWTDecoder: BodyDecoder {

let keyIDToVerifier: (String) -> JWTVerifier?
let jwtVerifier: JWTVerifier?
public var claimsKeyDecodingStrategy : JSONDecoder.KeyDecodingStrategy = .useDefaultKeys
public var claimsDateDecodingStrategy : JSONDecoder.DateDecodingStrategy = .deferredToDate
public var claimsDataDecodingStrategy : JSONDecoder.DataDecodingStrategy = .base64
public var claimsNonConformingFloatDecodingStrategy : JSONDecoder.NonConformingFloatDecodingStrategy = .throw

// MARK: Initializers

Expand Down Expand Up @@ -84,6 +88,10 @@ public class JWTDecoder: BodyDecoder {

// Decode the JWT headers and claims data into a _JWTDecoder.
let decoder = _JWTDecoder(header: headerData, claims: claimsData)
decoder.claimsKeyDecodingStrategy = self.claimsKeyDecodingStrategy
decoder.claimsDateDecodingStrategy = self.claimsDateDecodingStrategy
decoder.claimsDataDecodingStrategy = self.claimsDataDecodingStrategy
decoder.claimsNonConformingFloatDecodingStrategy = self.claimsNonConformingFloatDecodingStrategy
let jwt = try decoder.decode(type)

let _jwtVerifier: JWTVerifier
Expand Down Expand Up @@ -156,14 +164,26 @@ fileprivate class _JWTDecoder: Decoder {

var userInfo: [CodingUserInfoKey : Any] = [:]

var claimsKeyDecodingStrategy : JSONDecoder.KeyDecodingStrategy = .useDefaultKeys

var claimsDateDecodingStrategy : JSONDecoder.DateDecodingStrategy = .deferredToDate

var claimsDataDecodingStrategy : JSONDecoder.DataDecodingStrategy = .base64

var claimsNonConformingFloatDecodingStrategy : JSONDecoder.NonConformingFloatDecodingStrategy = .throw

// Call the Codable Types init from decoder function.
public func decode<T: Decodable>(_ type: T.Type) throws -> T {
return try type.init(from: self)
}

// JWT should only be a Keyed container
func container<Key : CodingKey>(keyedBy type: Key.Type) throws -> KeyedDecodingContainer<Key> {
let container = _JWTKeyedDecodingContainer<Key>(decoder: self, header: header, claims: claims)
var container = _JWTKeyedDecodingContainer<Key>(decoder: self, header: header, claims: claims)
container.claimsKeyDecodingStrategy = claimsKeyDecodingStrategy
container.claimsDateDecodingStrategy = claimsDateDecodingStrategy
container.claimsDataDecodingStrategy = claimsDataDecodingStrategy
container.claimsNonConformingFloatDecodingStrategy = claimsNonConformingFloatDecodingStrategy
return KeyedDecodingContainer(container)
}

Expand All @@ -189,6 +209,14 @@ private struct _JWTKeyedDecodingContainer<Key: CodingKey>: KeyedDecodingContaine

var codingPath: [CodingKey]

var claimsKeyDecodingStrategy : JSONDecoder.KeyDecodingStrategy

var claimsDateDecodingStrategy : JSONDecoder.DateDecodingStrategy

var claimsDataDecodingStrategy : JSONDecoder.DataDecodingStrategy

var claimsNonConformingFloatDecodingStrategy : JSONDecoder.NonConformingFloatDecodingStrategy

public var allKeys: [Key]
{
#if swift(>=4.1)
Expand All @@ -203,6 +231,10 @@ private struct _JWTKeyedDecodingContainer<Key: CodingKey>: KeyedDecodingContaine
self.header = header
self.claims = claims
self.codingPath = decoder.codingPath
self.claimsKeyDecodingStrategy = .useDefaultKeys
self.claimsDateDecodingStrategy = .deferredToDate
self.claimsDataDecodingStrategy = .base64
self.claimsNonConformingFloatDecodingStrategy = .throw
}

public func contains(_ key: Key) -> Bool {
Expand All @@ -224,6 +256,10 @@ private struct _JWTKeyedDecodingContainer<Key: CodingKey>: KeyedDecodingContaine
return decodedHeader
} else
if key.stringValue == "claims" {
jsonDecoder.keyDecodingStrategy = self.claimsKeyDecodingStrategy
jsonDecoder.dateDecodingStrategy = self.claimsDateDecodingStrategy
jsonDecoder.dataDecodingStrategy = self.claimsDataDecodingStrategy
jsonDecoder.nonConformingFloatDecodingStrategy = self.claimsNonConformingFloatDecodingStrategy
return try jsonDecoder.decode(type, from: claims)
} else {
throw DecodingError.keyNotFound(key, DecodingError.Context(codingPath: codingPath, debugDescription: "value not found for provided key"))
Expand Down