Add multipart/form-data support

NetworkingSampleApp/NetworkingSampleApp.xcodeproj/project.pbxproj

@@ -34,6 +34,7 @@
 		B52674C32A370E35006D3B9C /* UploadItemViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52674C22A370E35006D3B9C /* UploadItemViewModel.swift */; };
 		B52674C52A37102D006D3B9C /* UploadsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52674C42A37102D006D3B9C /* UploadsView.swift */; };
 		B52674C72A371046006D3B9C /* UploadItemView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52674C62A371046006D3B9C /* UploadItemView.swift */; };
+		B5A2CE6C2A3FF42400467EB3 /* FormUploadsViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5A2CE6B2A3FF42400467EB3 /* FormUploadsViewModel.swift */; };
 		DD410D6F293F2E6E006D8E31 /* AuthorizationViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = DD410D6E293F2E6E006D8E31 /* AuthorizationViewModel.swift */; };
 		DD6E48732A0E24D30025AD05 /* DownloadProgressView.swift in Sources */ = {isa = PBXBuildFile; fileRef = DD6E48722A0E24D30025AD05 /* DownloadProgressView.swift */; };
 		DD6E48762A0E2CD30025AD05 /* DownloadAPIManager+SharedInstance.swift in Sources */ = {isa = PBXBuildFile; fileRef = DD6E48752A0E2CD30025AD05 /* DownloadAPIManager+SharedInstance.swift */; };
@@ -74,6 +75,7 @@
 		B52674C22A370E35006D3B9C /* UploadItemViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UploadItemViewModel.swift; sourceTree = "<group>"; };
 		B52674C42A37102D006D3B9C /* UploadsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UploadsView.swift; sourceTree = "<group>"; };
 		B52674C62A371046006D3B9C /* UploadItemView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UploadItemView.swift; sourceTree = "<group>"; };
+		B5A2CE6B2A3FF42400467EB3 /* FormUploadsViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FormUploadsViewModel.swift; sourceTree = "<group>"; };
 		DD410D6E293F2E6E006D8E31 /* AuthorizationViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthorizationViewModel.swift; sourceTree = "<group>"; };
 		DD6E48722A0E24D30025AD05 /* DownloadProgressView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DownloadProgressView.swift; sourceTree = "<group>"; };
 		DD6E48752A0E2CD30025AD05 /* DownloadAPIManager+SharedInstance.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "DownloadAPIManager+SharedInstance.swift"; sourceTree = "<group>"; };
@@ -240,6 +242,7 @@
 		B52674BB2A370D0D006D3B9C /* Upload */ = {
 			isa = PBXGroup;
 			children = (
+				B5A2CE6B2A3FF42400467EB3 /* FormUploadsViewModel.swift */,
 				B52674BE2A370D33006D3B9C /* UploadItem.swift */,
 				B52674C62A371046006D3B9C /* UploadItemView.swift */,
 				B52674C22A370E35006D3B9C /* UploadItemViewModel.swift */,
@@ -337,6 +340,7 @@
 				DD6E48762A0E2CD30025AD05 /* DownloadAPIManager+SharedInstance.swift in Sources */,
 				DDE8884529476AC300DD3BFF /* SampleRefreshTokenRequest.swift in Sources */,
 				DDD3AD212951F527006CB777 /* SampleAuthorizationManager.swift in Sources */,
+				B5A2CE6C2A3FF42400467EB3 /* FormUploadsViewModel.swift in Sources */,
 				23EA9CF7292FB70A00B8E418 /* SampleUserAuthResponse.swift in Sources */,
 				58E4E0ED2982D884000ACBC0 /* SampleAuthorizationStorageManager.swift in Sources */,
 				23EA9CF6292FB70A00B8E418 /* SampleAPIError.swift in Sources */,

NetworkingSampleApp/NetworkingSampleApp/API/Routers/SampleUploadRouter.swift

@@ -12,6 +12,7 @@ import UniformTypeIdentifiers
 enum SampleUploadRouter: Requestable {
     case image
     case file(URL)
+    case multipart(boundary: String)
 
     var baseURL: URL {
         fatalError("Provide your API base URL for upload")
@@ -23,6 +24,8 @@ enum SampleUploadRouter: Requestable {
             return ["Content-Type": "image/png"]
         case let .file(url):
             return ["Content-Type": url.mimeType]
+        case let .multipart(boundary):
+            return ["Content-Type": "multipart/form-data; boundary=\(boundary)"]
         }
     }
 

NetworkingSampleApp/NetworkingSampleApp/ContentView.swift

@@ -30,11 +30,18 @@ struct ContentView: View {
                 case .downloads:
                     DownloadsView()
                 case .uploads:
-                    UploadsView(viewModel: UploadsViewModel(
-                        uploadService: UploadService(
-                            uploadManager: UploadAPIManager()
+                    UploadsView(
+                        viewModel: UploadsViewModel(
+                            uploadService: UploadService(
+                                uploadManager: UploadAPIManager()
+                            )
+                        ),
+                        formViewModel: FormUploadsViewModel(
+                            uploadService: UploadService(
+                                uploadManager: UploadAPIManager()
+                            )
                         )
-                    ))
+                    )
                 }
             }
         }

NetworkingSampleApp/NetworkingSampleApp/Scenes/Upload/FormUploadsViewModel.swift

@@ -0,0 +1,59 @@
+//
+//  FormUploadsViewModel.swift
+//  NetworkingSampleApp
+//
+//  Created by Tony Ngo on 19.06.2023.
+//
+
+import Foundation
+
+@MainActor
+final class FormUploadsViewModel: ObservableObject {
+    @Published var text = ""
+    @Published var fileUrl: URL?
+    @Published var isErrorAlertPresented = false
+    @Published private(set) var error: Error?
+    @Published private(set) var uploadItemViewModels: [UploadItemViewModel] = []
+
+    var selectedFileName: String {
+        let resources = try? fileUrl?.resourceValues(forKeys:[.fileSizeKey])
+        let fileSize = (resources?.fileSize ?? 0) / 1_000_000
+        var fileName = fileUrl?.lastPathComponent ?? ""
+        if fileSize > 0 { fileName += "\n\(fileSize) MB" }
+        return fileName
+    }
+
+    private let uploadService: UploadService
+
+    init(uploadService: UploadService) {
+        self.uploadService = uploadService
+    }
+}
+
+extension FormUploadsViewModel {
+    func uploadForm() {
+        Task {
+            do {
+                let uploadItem = try await uploadService.uploadFormData { form in
+                    form.append(Data(self.text.utf8), name: "textfield")
+
+                    if let fileUrl = self.fileUrl {
+                        try form.append(from: fileUrl, name: "attachment")
+                    }
+                }
+
+                uploadItemViewModels.append(UploadItemViewModel(
+                    item: uploadItem,
+                    uploadService: uploadService
+                ))
+
+                text = ""
+                fileUrl = nil
+            } catch {
+                print("Failed to upload with error:", error)
+                self.error = error
+                self.isErrorAlertPresented = true
+            }
+        }
+    }
+}

NetworkingSampleApp/NetworkingSampleApp/Scenes/Upload/UploadService.swift

@@ -45,6 +45,20 @@ extension UploadService {
         )
     }
 
+    func uploadFormData(_ build: @escaping (MultipartFormData) throws -> Void) async throws -> UploadItem {
+        let multipartFormData = MultipartFormData()
+        try build(multipartFormData)
+        let task = try await uploadManager.upload(
+            multipartFormData: multipartFormData,
+            to: SampleUploadRouter.multipart(boundary: multipartFormData.boundary),
+            retryConfiguration: .default
+        )
+        return UploadItem(
+            id: task.id,
+            fileName: "Form upload of size \(multipartFormData.size)"
+        )
+    }
+
     func uploadStateStream(for uploadTaskId: String) async -> UploadAPIManaging.StateStream {
         await uploadManager.stateStream(for: uploadTaskId)
     }

NetworkingSampleApp/NetworkingSampleApp/Scenes/Upload/UploadsView.swift

@@ -10,36 +10,18 @@ import PhotosUI
 
 struct UploadsView: View {
     @ObservedObject var viewModel: UploadsViewModel
+    @ObservedObject var formViewModel: FormUploadsViewModel
     @State var isPhotosPickerPresented = false
     @State var isFileImporterPresented = false
+    @State var isFormFileImporterPresented = false
     @State var selectedPhotoPickerItem: PhotosPickerItem?
 
     var body: some View {
-        List {
-            Section("Upload") {
-                Button("Photo") { isPhotosPickerPresented = true }
-                    .photosPicker(
-                        isPresented: $isPhotosPickerPresented,
-                        selection: $selectedPhotoPickerItem,
-                        matching: .images
-                    )
-                    .onChange(of: selectedPhotoPickerItem) { photo in
-                        photo?.loadTransferable(type: Data.self) { result in
-                            viewModel.uploadImage(result: result)
-                        }
-                    }
-
-                Button("File") { isFileImporterPresented = true }
-                    .fileImporter(
-                        isPresented: $isFileImporterPresented,
-                        allowedContentTypes: [.mp3, .mpeg4Movie]
-                    ) { result in
-                        viewModel.uploadFile(result: result)
-                    }
-            }
+        Form {
+            singleUpload
 
             if !viewModel.uploadItemViewModels.isEmpty {
-                Section("Upload progress") {
+                Section("Single upload progress") {
                     VStack {
                         ForEach(viewModel.uploadItemViewModels.indices, id: \.self) { index in
                             let viewModel = viewModel.uploadItemViewModels[index]
@@ -48,7 +30,112 @@ struct UploadsView: View {
                     }
                 }
             }
+
+            multipartUpload
+
+            if !formViewModel.uploadItemViewModels.isEmpty {
+                Section("Multi part upload progress") {
+                    VStack {
+                        ForEach(formViewModel.uploadItemViewModels.indices, id: \.self) { index in
+                            let viewModel = formViewModel.uploadItemViewModels[index]
+                            UploadItemView(viewModel: viewModel)
+                        }
+                    }
+                }
+            }
         }
+        .alert(
+            "Error",
+            isPresented: $viewModel.isErrorAlertPresented,
+            actions: {},
+            message: {
+                Text(viewModel.error?.localizedDescription ?? "")
+            }
+        )
+        .alert(
+            "Error",
+            isPresented: $formViewModel.isErrorAlertPresented,
+            actions: {},
+            message: {
+                Text(formViewModel.error?.localizedDescription ?? "")
+            }
+        )
         .navigationTitle("Uploads")
     }
 }
+
+private extension UploadsView {
+    var singleUpload: some View {
+        Section("Single") {
+            Button("Photo") { isPhotosPickerPresented = true }
+                .photosPicker(
+                    isPresented: $isPhotosPickerPresented,
+                    selection: $selectedPhotoPickerItem,
+                    matching: .images
+                )
+                .onChange(of: selectedPhotoPickerItem) { photo in
+                    photo?.loadTransferable(type: Data.self) { result in
+                        viewModel.uploadImage(result: result)
+                    }
+                }
+
+            Button("File") { isFileImporterPresented = true }
+                .fileImporter(
+                    isPresented: $isFileImporterPresented,
+                    allowedContentTypes: [.mp3, .mpeg4Movie]
+                ) { result in
+                    viewModel.uploadFile(result: result)
+                }
+        }
+    }
+
+    var multipartUpload: some View {
+        Section(
+            content: {
+                TextField("Enter text", text: $formViewModel.text)
+
+                HStack {
+                    if formViewModel.fileUrl == nil {
+                        Button("Add attachment") { isFormFileImporterPresented = true }
+                            .fileImporter(
+                                isPresented: $isFormFileImporterPresented,
+                                allowedContentTypes: [.mp3, .mpeg4Movie]
+                            ) { result in
+                                formViewModel.fileUrl = try? result.get()
+                            }
+                    }
+
+
+                    Text(formViewModel.selectedFileName)
+
+                    Spacer()
+
+                    if formViewModel.fileUrl != nil {
+                        Button(
+                            action: { formViewModel.fileUrl = nil },
+                            label: {
+                                Image(systemName: "x")
+                                    .symbolVariant(.circle.fill)
+                                    .font(.title2)
+                                    .symbolRenderingMode(.hierarchical)
+                                    .foregroundStyle(.tertiary)
+                            }
+                        )
+                        .buttonStyle(.plain)
+                        .contentShape(Circle())
+                    }
+                }
+            },
+            header: {
+                Text("Multipart")
+            },
+            footer: {
+                Button("Upload") {
+                    formViewModel.uploadForm()
+                }
+                .buttonStyle(.borderedProminent)
+                .frame(maxWidth: .infinity)
+            }
+        )
+    }
+}

NetworkingSampleApp/NetworkingSampleApp/Scenes/Upload/UploadsViewModel.swift

@@ -9,7 +9,8 @@ import Foundation
 
 @MainActor
 final class UploadsViewModel: ObservableObject {
-    @Published var error: Error?
+    @Published var isErrorAlertPresented = false
+    @Published private(set) var error: Error?
     @Published private(set) var uploadItemViewModels: [UploadItemViewModel] = []
 
     private let uploadService: UploadService
@@ -36,6 +37,7 @@ extension UploadsViewModel {
             } catch {
                 print("Failed to upload with error", error)
                 self.error = error
+                self.isErrorAlertPresented = true
             }
         }
     }
@@ -52,6 +54,7 @@ extension UploadsViewModel {
             } catch {
                 print("Failed to upload with error", error)
                 self.error = error
+                self.isErrorAlertPresented = true
             }
         }
     }

Sources/Networking/Core/Upload/MultipartFormData+BodyPart.swift

@@ -0,0 +1,49 @@
+//
+//  MultipartFormData+BodyPart.swift
+//  
+//
+//  Created by Tony Ngo on 18.06.2023.
+//
+
+import Foundation
+
+public extension MultipartFormData {
+    /// Represents an individual part of the `multipart/form-data`.
+    struct BodyPart {
+        /// The input stream containing the data of the part's body.
+        let dataStream: InputStream
+
+        /// The name parameter of the `Content-Disposition` header field.
+        let name: String
+
+        /// The size of the part's body.
+        let size: UInt64
+
+        /// An optional file parameter of the `Content-Disposition` header field. This value may be provided if the body part represents a content of a file.
+        let fileName: String?
+
+        /// An optional value of the `Content-Type` header field.
+        let mimeType: String?
+    }
+}
+
+extension MultipartFormData.BodyPart {
+    /// Returns the body part's header fields and values based on the properties of the instance.
+    var contentHeaders: [HTTPHeader.HeaderField: String] {
+        var disposition = "form-data; name=\"\(name)\""
+
+        if let fileName {
+            disposition += "; filename=\"\(fileName)\""
+        }
+
+        var headers: [HTTPHeader.HeaderField: String] = [
+            .contentDisposition: disposition
+        ]
+
+        if let mimeType {
+            headers[.contentType] = mimeType
+        }
+
+        return headers
+    }
+}