Add presentation use case

VCEntities/VCEntities/presentation/PresentationResponseContainer.swift

@@ -10,7 +10,7 @@ enum PresentationResponseError: Error {
 public struct PresentationResponseContainer {
     let request: PresentationRequest
     let expiryInSeconds: Int
-    let audience: String?
+    public let audience: String?
     public var requestedIdTokenMap: RequestedIdTokenMap = [:]
     public var requestedSelfAttestedClaimMap: RequestedSelfAttestedClaimMap = [:]
     public var requestVCMap: RequestedVerifiableCredentialMap = [:]

VCUseCase/VCUseCase.xcodeproj/project.pbxproj

@@ -15,6 +15,7 @@
 		550F1E6625116CD6009AF467 /* TestData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 550F1E6525116CD6009AF467 /* TestData.swift */; };
 		550F1E6825116E86009AF467 /* MockTokenSigner.swift in Sources */ = {isa = PBXBuildFile; fileRef = 550F1E6725116E86009AF467 /* MockTokenSigner.swift */; };
 		550F1E6A25125BC6009AF467 /* MockIssuanceResponseFormatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 550F1E6925125BC6009AF467 /* MockIssuanceResponseFormatter.swift */; };
+		555CE0932526AD0400C1C938 /* PresentationUseCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = 555CE0922526AD0400C1C938 /* PresentationUseCase.swift */; };
 		922D7E7A2525248900E4C8B5 /* VCRepository.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 922D7E792525248900E4C8B5 /* VCRepository.framework */; };
 		922D7E7F2525264400E4C8B5 /* PromiseKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 92B9682425240AE600F64AB0 /* PromiseKit.framework */; };
 		922D7E802525264400E4C8B5 /* PromiseKit.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 92B9682425240AE600F64AB0 /* PromiseKit.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
@@ -56,6 +57,7 @@
 		550F1E6525116CD6009AF467 /* TestData.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestData.swift; sourceTree = "<group>"; };
 		550F1E6725116E86009AF467 /* MockTokenSigner.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MockTokenSigner.swift; sourceTree = "<group>"; };
 		550F1E6925125BC6009AF467 /* MockIssuanceResponseFormatter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MockIssuanceResponseFormatter.swift; sourceTree = "<group>"; };
+		555CE0922526AD0400C1C938 /* PresentationUseCase.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PresentationUseCase.swift; sourceTree = "<group>"; };
 		922D7E792525248900E4C8B5 /* VCRepository.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = VCRepository.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		92B9681C25240AB800F64AB0 /* PromiseKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = PromiseKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		92B9682025240ADD00F64AB0 /* PMKFoundation.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = PMKFoundation.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -106,6 +108,7 @@
 			isa = PBXGroup;
 			children = (
 				550F1E532510195A009AF467 /* IssuanceUseCase.swift */,
+				555CE0922526AD0400C1C938 /* PresentationUseCase.swift */,
 				550F1E3825101758009AF467 /* VCUseCase.h */,
 				550F1E3925101758009AF467 /* Info.plist */,
 			);
@@ -256,6 +259,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				550F1E542510195A009AF467 /* IssuanceUseCase.swift in Sources */,
+				555CE0932526AD0400C1C938 /* PresentationUseCase.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

VCUseCase/VCUseCase/PresentationUseCase.swift

@@ -0,0 +1,49 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+
+import PromiseKit
+import VCRepository
+import VCEntities
+
+public class PresentationUseCase {
+    
+    let masterIdentifier: MockIdentifier = MockIdentifier()
+    let formatter: PresentationResponseFormatter
+    let repo: PresentationRepository
+    
+    public init() {
+        self.formatter = PresentationResponseFormatter()
+        self.repo = PresentationRepository()
+    }
+    
+    init(formatter: PresentationResponseFormatter,
+         repo: PresentationRepository) {
+        self.formatter = formatter
+        self.repo = repo
+    }
+    
+    public func getRequest(usingUrl url: String) -> Promise<PresentationRequest> {
+        return self.repo.getRequest(withUrl: url)
+    }
+    
+    public func send(response: PresentationResponseContainer, identifier: MockIdentifier) -> Promise<String?> {
+        return firstly {
+            self.formatPresentationResponse(response: response, identifier: identifier)
+        }.then { signedToken in
+            self.repo.sendResponse(usingUrl:  response.audience!, withBody: signedToken)
+        }
+    }
+    
+    private func formatPresentationResponse(response: PresentationResponseContainer, identifier: MockIdentifier) -> Promise<PresentationResponse> {
+        return Promise { seal in
+            do {
+                seal.fulfill(try self.formatter.format(response: response, usingIdentifier: identifier))
+            } catch {
+                seal.reject(error)
+            }
+        }
+    }
+}