Feature/draft 14

README.md

@@ -18,7 +18,7 @@ the [EUDI Wallet Reference Implementation project description](https://github.co
 ## Overview
 
 This is a Swift library, that supports 
-the [OpenId4VCI (draft 13)](https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html) protocol.
+the [OpenId4VCI (draft 14)](https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html) protocol.
 In particular, the library focuses on the wallet's role in the protocol to:
 - Resolve credential issuer metadata 
 - Resolve metadata of the authorization server protecting issuance services
@@ -202,9 +202,9 @@ let payload: IssuanceRequestPayload = .configurationBased(
   credentialConfigurationIdentifier: ...
 )
 
-let requestOutcome = try await issuer.requestSingle(
+let requestOutcome = try await issuer.request(
     proofRequest: ...,
-    bindingKey: ...,
+    bindingKeys: ..., // SigningKeyProxy array
     requestPayload: payload,
     responseEncryptionSpecProvider:  { 
         Issuer.createResponseEncryptionSpec($0) 
@@ -229,18 +229,21 @@ Specification defines ([section 6.2](https://openid.github.io/OpenID4VCI/openid-
 if `authorization_details` parameter is used in authorization endpoint. Current version of library is not parsing/utilizing this response attribute.
 
 ### Credential Request
-Current version of the library implements integrations with issuer's [Crednetial Endpoint](https://openid.github.io/OpenID4VCI/openid-4-verifiable-credential-issuance-wg-draft.html#name-credential-endpoint),
-[Batch Crednetial Endpoint](https://openid.github.io/OpenID4VCI/openid-4-verifiable-credential-issuance-wg-draft.html#name-batch-credential-endpoint) and
+Current version of the library implements integrations with issuer's [Crednetial Endpoint](https://openid.github.io/OpenID4VCI/openid-4-verifiable-credential-issuance-wg-draft.html#name-credential-endpoint) and
 [Deferred Crednetial Endpoint](https://openid.github.io/OpenID4VCI/openid-4-verifiable-credential-issuance-wg-draft.html#name-deferred-credential-endpoin)
 endpoints.
 
-**NOTE:** Attribute `credential_identifier` of a credential request (single or batch) is not yet supported.
+**NOTE:** Attribute `credential_identifier` of a credential request is not yet supported.
 
 #### Credential Format Profiles
 OpenId4VCI specification defines several extension points to accommodate the differences across Credential formats. The current version of the library fully supports **ISO mDL** profile and gives some initial support for **IETF SD-JWT VC** profile.  
 
 #### Proof Types
-OpenId4VCI specification (draft 12) defines two types of proofs that can be included in a credential issuance request, JWT proof type and CWT proof type. Current version of the library supports only JWT proof types
+OpenId4VCI specification (draft 14) defines proofs that can be included in a credential issuance request, JWT proof type in particular. The current version of the library supports JWT proof types.
+
+#### Notes
+
+Examples for all of the above are located in the test target of the library.
 
 ## How to contribute
 

Sources/Entities/AccessManagement/AuthorizationDetail.swift

@@ -16,11 +16,11 @@
 import Foundation
 
 public struct AuthorizationType: Codable {
-    public let type: String
-    
-    public init(type: String) {
-        self.type = type
-    }
+  public let type: String
+
+  public init(type: String) {
+    self.type = type
+  }
 }
 
 public struct AuthorizationDetail: Codable {

Sources/Entities/AuthorizationDetails/AuthDetailsForTokenRequest.swift

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2023 European Commission
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import Foundation
+
+public enum AuthorizationDetailsInTokenRequest {
+  case doNotInclude
+  case include(filter: (CredentialConfigurationIdentifier) -> Bool)
+}
+

Sources/Entities/BatchCredentialIssuance.swift

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2023 European Commission
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import Foundation
+
+public struct BatchCredentialIssuance: Codable {
+  public let batchSize: Int
+
+  enum CodingKeys: String, CodingKey {
+    case batchSize = "batch_size"
+  }
+
+  public init(batchSize: Int) throws {
+    if batchSize <= 0 {
+      throw ValidationError.invalidBatchSize(batchSize)
+    }
+    self.batchSize = batchSize
+  }
+}

Sources/Entities/Credential/Credential.swift

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2023 European Commission
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import Foundation
+import SwiftyJSON
+
+public enum Credential: Codable {
+  case string(String)
+  case json(JSON)
+
+  public init(from decoder: Decoder) throws {
+    let container = try decoder.singleValueContainer()
+    if let stringValue = try? container.decode(String.self) {
+      self = .string(stringValue)
+    } else if let jsonObject = try? container.decode(JSON.self) {
+      self = .json(jsonObject)
+    } else {
+      throw DecodingError.typeMismatch(
+        Credential.self,
+        DecodingError.Context(
+          codingPath: decoder.codingPath,
+          debugDescription: "Invalid Credential Type"
+        )
+      )
+    }
+  }
+
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.singleValueContainer()
+    switch self {
+    case .string(let value):
+      try container.encode(value)
+    case .json(let jsonValue):
+      try container.encode(jsonValue)
+    }
+  }
+}

Sources/Entities/Types/IssuedCredential.swift → Sources/Entities/Credential/IssuedCredential.swift

@@ -14,12 +14,14 @@
  * limitations under the License.
  */
 import Foundation
+import SwiftyJSON
 
-public enum IssuedCredential {
+public enum IssuedCredential: Codable {
   case issued(
-    format: String,
-    credential: String,
-    notificationId: String
+    format: String?,
+    credential: Credential,
+    notificationId: String?,
+    additionalInfo: JSON?
   )
   case deferred(transactionId: TransactionId)
 }

Sources/Entities/CredentialIssuer/CredentialIssuerMetadata.swift

@@ -21,20 +21,19 @@ public struct CredentialIssuerMetadata: Decodable, Equatable {
   public let credentialIssuerIdentifier: CredentialIssuerId
   public let authorizationServers: [URL]?
   public let credentialEndpoint: CredentialIssuerEndpoint
-  public let batchCredentialEndpoint: CredentialIssuerEndpoint?
   public let deferredCredentialEndpoint: CredentialIssuerEndpoint?
   public let notificationEndpoint: CredentialIssuerEndpoint?
   public let credentialResponseEncryption: CredentialResponseEncryption
   public let credentialsSupported: [CredentialConfigurationIdentifier: CredentialSupported]
   public let credentialIdentifiersSupported: Bool?
   public let signedMetadata: String?
   public let display: [Display]
+  public let batchCredentialIssuance: BatchCredentialIssuance?
 
   public enum CodingKeys: String, CodingKey {
     case credentialIssuerIdentifier = "credential_issuer"
     case authorizationServers = "authorization_servers"
     case credentialEndpoint = "credential_endpoint"
-    case batchCredentialEndpoint = "batch_credential_endpoint"
     case deferredCredentialEndpoint = "deferred_credential_endpoint"
     case notificationEndpoint = "notification_endpoint"
     case credentialResponseEncryptionAlgorithmsSupported = "credential_response_encryption_alg_values_supported"
@@ -45,26 +44,26 @@ public struct CredentialIssuerMetadata: Decodable, Equatable {
     case credentialResponseEncryption = "credential_response_encryption"
     case signedMetadata = "signed_metadata"
     case credentialIdentifiersSupported = "credential_identifiers_supported"
+    case batchCredentialIssuance = "batch_credential_issuance"
   }
 
   public init(
     credentialIssuerIdentifier: CredentialIssuerId,
     authorizationServers: [URL],
     credentialEndpoint: CredentialIssuerEndpoint,
-    batchCredentialEndpoint: CredentialIssuerEndpoint?,
     deferredCredentialEndpoint: CredentialIssuerEndpoint?,
     notificationEndpoint: CredentialIssuerEndpoint?,
     credentialResponseEncryption: CredentialResponseEncryption = .notRequired,
     credentialConfigurationsSupported: [CredentialConfigurationIdentifier: CredentialSupported],
     signedMetadata: String?,
     display: [Display]?,
-    credentialIdentifiersSupported: Bool? = nil
+    credentialIdentifiersSupported: Bool? = nil,
+    batchCredentialIssuance: BatchCredentialIssuance? = nil
   ) {
     self.credentialIssuerIdentifier = credentialIssuerIdentifier
     self.authorizationServers = authorizationServers
 
     self.credentialEndpoint = credentialEndpoint
-    self.batchCredentialEndpoint = batchCredentialEndpoint
     self.deferredCredentialEndpoint = deferredCredentialEndpoint
     self.notificationEndpoint = notificationEndpoint
 
@@ -75,14 +74,14 @@ public struct CredentialIssuerMetadata: Decodable, Equatable {
     self.display = display ?? []
 
     self.credentialIdentifiersSupported = credentialIdentifiersSupported
+    self.batchCredentialIssuance = batchCredentialIssuance
   }
 
   public init(deferredCredentialEndpoint: CredentialIssuerEndpoint?) throws {
     try self.init(
       credentialIssuerIdentifier: .init(Constants.url),
       authorizationServers: [],
       credentialEndpoint: .init(string: Constants.url),
-      batchCredentialEndpoint: nil,
       deferredCredentialEndpoint: deferredCredentialEndpoint,
       notificationEndpoint: nil,
       credentialConfigurationsSupported: [:],
@@ -102,7 +101,6 @@ public struct CredentialIssuerMetadata: Decodable, Equatable {
     authorizationServers = servers ?? [credentialIssuerIdentifier.url]
 
     credentialEndpoint = try container.decode(CredentialIssuerEndpoint.self, forKey: .credentialEndpoint)
-    batchCredentialEndpoint = try container.decodeIfPresent(CredentialIssuerEndpoint.self, forKey: .batchCredentialEndpoint)
     deferredCredentialEndpoint = try container.decodeIfPresent(CredentialIssuerEndpoint.self, forKey: .deferredCredentialEndpoint)
     notificationEndpoint = try container.decodeIfPresent(CredentialIssuerEndpoint.self, forKey: .notificationEndpoint)
 
@@ -147,6 +145,8 @@ public struct CredentialIssuerMetadata: Decodable, Equatable {
     signedMetadata = try? container.decodeIfPresent(String.self, forKey: .signedMetadata)
 
     credentialIdentifiersSupported = try? container.decodeIfPresent(Bool.self, forKey: .credentialIdentifiersSupported) ?? false
+
+    batchCredentialIssuance = try? container.decodeIfPresent(BatchCredentialIssuance.self, forKey: .batchCredentialIssuance)
   }
 
   public static func == (lhs: CredentialIssuerMetadata, rhs: CredentialIssuerMetadata) -> Bool {

Sources/Entities/CredentialIssuer/ProofType.swift

@@ -15,10 +15,10 @@
  */
 import Foundation
 
-public enum ProofType: Codable {
+public enum ProofType: Decodable {
   case jwt
-  case cwt
   case ldpVp
+  case unsupported
 
   private enum CodingKeys: String, CodingKey {
     case rawValue
@@ -31,38 +31,21 @@ public enum ProofType: Codable {
     switch rawValue {
     case "JWT", "jwt":
       self = .jwt
-    case "CWT", "cwt":
-      self = .cwt
     case "LDP_VP", "ldp_vp":
       self = .ldpVp
     default:
-      throw DecodingError.dataCorruptedError(in: container, debugDescription: "Invalid proof type")
-    }
-  }
-
-  public func encode(to encoder: Encoder) throws {
-    var container = encoder.singleValueContainer()
-
-    switch self {
-    case .jwt:
-      try container.encode("JWT")
-    case .cwt:
-      try container.encode("CWT")
-    case .ldpVp:
-      try container.encode("LDP_VP")
+      self = .unsupported
     }
   }
 
   public init(type: String) throws {
     switch type {
     case "JWT", "jwt":
       self = .jwt
-    case "CWT", "cwt":
-      self = .cwt
     case "LDP_VP", "ldp_vp":
       self = .ldpVp
     default:
-      throw ValidationError.error(reason: "Invalid proof type: \(type)")
+      self = .unsupported
     }
   }
 }

Sources/Entities/CredentialSupported/CredentialSupported.swift

@@ -46,7 +46,7 @@ public extension CredentialSupported {
   func toIssuanceRequest(
     requester: IssuanceRequesterType,
     claimSet: ClaimSet? = nil,
-    proof: Proof? = nil,
+    proofs: [Proof] = [],
     credentialIdentifier: CredentialIdentifier? = nil,
     responseEncryptionSpecProvider: (_ issuerResponseEncryptionMetadata: CredentialResponseEncryption) -> IssuanceResponseEncryptionSpec?
   ) throws -> CredentialIssuanceRequest {
@@ -75,7 +75,7 @@ public extension CredentialSupported {
       return try credentialConfiguration.toIssuanceRequest(
         responseEncryptionSpec: issuerEncryption.notRequired ? nil : responseEncryptionSpec,
         claimSet: claimSet,
-        proof: proof
+        proofs: proofs
       )
 
     case .sdJwtVc(let credentialConfiguration):
@@ -102,7 +102,7 @@ public extension CredentialSupported {
       return try credentialConfiguration.toIssuanceRequest(
         responseEncryptionSpec: issuerEncryption.notRequired ? nil : responseEncryptionSpec,
         claimSet: claimSet,
-        proof: proof
+        proofs: proofs
       )
     default:
       throw ValidationError.error(reason: "Unsupported profile for issuance request")

Sources/Entities/Errors/CredentialIssuanceError.swift

@@ -18,7 +18,6 @@ import Foundation
 public enum CredentialIssuanceError: Error, LocalizedError {
   case pushedAuthorizationRequestFailed(error: String, errorDescription: String?)
   case accessTokenRequestFailed(error: String, errorDescription: String?)
-  case issuerDoesNotSupportBatchIssuance
   case responseUnparsable(String)
   case invalidIssuanceRequest(String)
   case cryptographicSuiteNotSupported(String)
@@ -47,8 +46,6 @@ public enum CredentialIssuanceError: Error, LocalizedError {
         .issuanceRequestFailed(_, let errorDescription),
         .invalidProof(_, _, let errorDescription):
       return errorDescription
-    case .issuerDoesNotSupportBatchIssuance:
-      return "Issuer does not support batch issuance"
     case .responseUnparsable(let details):
       return "Response is unparsable. Details: \(details)"
     case .invalidIssuanceRequest(let details):

Sources/Entities/Errors/CredentialIssuerMetadataValidationError.swift

@@ -29,10 +29,6 @@ public enum CredentialIssuerMetadataValidationError: Error {
   /// - Parameter reason: The reason for the invalidity.
   case invalidCredentialEndpoint(reason: String)
 
-  /// The batch credential endpoint is invalid.
-  /// - Parameter reason: The reason for the invalidity.
-  case invalidBatchCredentialEndpoint(reason: String)
-
   /// The deferred credential endpoint is invalid.
   /// - Parameter reason: The reason for the invalidity.
   case invalidDeferredCredentialEndpoint(reason: String)