Add image uploader

Changelog-Added: Add image uploader

damus/Views/AttachMediaUtility.swift

@@ -0,0 +1,200 @@
+//
+//  AttachMediaUtility.swift
+//  damus
+//
+//  Created by Swift on 2/17/23.
+//
+
+import SwiftUI
+
+extension PostView {
+    func myImageUploadRequest(imageToUpload: UIImage, imageUploader: ImageUploader) {
+        let myUrl = NSURL(string: imageUploader.postAPI);
+        let request = NSMutableURLRequest(url:myUrl! as URL);
+        request.httpMethod = "POST";
+        let boundary = generateBoundaryString()
+        request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
+        let imageData = imageToUpload.jpegData(compressionQuality: 1)
+        if imageData == nil  {
+            return
+        }
+        request.httpBody = createBodyWithParameters(imageDataKey: imageData! as NSData, boundary: boundary, imageUploader: imageUploader) as Data
+
+        let task = URLSession.shared.dataTask(with: request as URLRequest) {
+            data, response, error in
+            if error != nil {
+                print("error=\(error!)")
+                return
+            }
+
+            let responseString = String(data: data!, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))
+            print("response data = \(responseString!)")
+
+            let uploadedImageURL = NSMutableAttributedString(string: imageUploader.getImageURL(from: responseString), attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 18.0), NSAttributedString.Key.foregroundColor: UIColor.label])
+            let combinedAttributedString = NSMutableAttributedString()
+            combinedAttributedString.append(post)
+            combinedAttributedString.append(uploadedImageURL)
+            post = combinedAttributedString
+        }
+        task.resume()
+    }
+
+    func createBodyWithParameters(imageDataKey: NSData, boundary: String, imageUploader: ImageUploader) -> NSData {
+        let body = NSMutableData();
+        let contentType = "image/jpg"
+        body.appendString(string: "Content-Type: multipart/form-data; boundary=\(boundary)\r\n\r\n")
+        body.appendString(string: "--\(boundary)\r\n")
+        body.appendString(string: "Content-Disposition: form-data; name=\(imageUploader.nameParam); filename=\"damus_generic_filename.jpg\"\r\n")
+        body.appendString(string: "Content-Type: \(contentType)\r\n\r\n")
+        body.append(imageDataKey as Data)
+        body.appendString(string: "\r\n")
+        body.appendString(string: "--\(boundary)--\r\n")
+        return body
+    }
+
+    func generateBoundaryString() -> String {
+        return "Boundary-\(NSUUID().uuidString)"
+
+    }
+
+    struct ImagePicker: UIViewControllerRepresentable {
+
+        @Environment(\.presentationMode)
+        private var presentationMode
+
+        let sourceType: UIImagePickerController.SourceType
+        let onImagePicked: (UIImage) -> Void
+
+        final class Coordinator: NSObject,
+                                 UINavigationControllerDelegate,
+                                 UIImagePickerControllerDelegate {
+
+            @Binding
+            private var presentationMode: PresentationMode
+            private let sourceType: UIImagePickerController.SourceType
+            private let onImagePicked: (UIImage) -> Void
+
+            init(presentationMode: Binding<PresentationMode>,
+                 sourceType: UIImagePickerController.SourceType,
+                 onImagePicked: @escaping (UIImage) -> Void) {
+                _presentationMode = presentationMode
+                self.sourceType = sourceType
+                self.onImagePicked = onImagePicked
+            }
+
+            func imagePickerController(_ picker: UIImagePickerController,
+                                       didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
+                let uiImage = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
+                onImagePicked(uiImage)
+                presentationMode.dismiss()
+
+            }
+
+            func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
+                presentationMode.dismiss()
+            }
+
+        }
+
+        func makeCoordinator() -> Coordinator {
+            return Coordinator(presentationMode: presentationMode,
+                               sourceType: sourceType,
+                               onImagePicked: onImagePicked)
+        }
+
+        func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
+            let picker = UIImagePickerController()
+            picker.sourceType = sourceType
+            picker.delegate = context.coordinator
+            return picker
+        }
+
+        func updateUIViewController(_ uiViewController: UIImagePickerController,
+                                    context: UIViewControllerRepresentableContext<ImagePicker>) {
+
+        }
+    }
+}
+
+extension NSMutableData {
+    func appendString(string: String) {
+        let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
+        append(data!)
+    }
+}
+
+enum ImageUploader: String, CaseIterable, Identifiable {
+    var id: String { self.rawValue }
+    case nostrBuild
+    case nostrImg
+
+    var nameParam: String {
+        switch self {
+        case .nostrBuild:
+            return "\"fileToUpload\""
+        case .nostrImg:
+            return "\"image\""
+        }
+    }
+
+    var displayImageUploaderName: String {
+        switch self {
+        case .nostrBuild:
+            return "NostrBuild"
+        case .nostrImg:
+            return "NostrImg"
+        }
+    }
+
+    struct Model: Identifiable, Hashable {
+        var id: String { self.tag }
+        var index: Int
+        var tag: String
+        var displayName : String
+    }
+
+    var model: Model {
+        switch self {
+        case .nostrBuild:
+            return .init(index: -1, tag: "nostrBuild", displayName: NSLocalizedString("NostrBuild", comment: "Dropdown option label for system default for NostrBuild image uploader."))
+        case .nostrImg:
+            return .init(index: 0, tag: "nostrImg", displayName: NSLocalizedString("NostrImg", comment: "Dropdown option label for system default for NostrImg image uploader."))
+        }
+    }
+
+
+    var postAPI: String {
+        switch self {
+        case .nostrBuild:
+            return "https://nostr.build/upload.php"
+        case .nostrImg:
+            return "https://nostrimg.com/api/upload"
+        }
+    }
+
+    func getImageURL(from responseString: String?) -> String {
+        switch self {
+        case .nostrBuild:
+            if let startIndex = responseString?.range(of: "nostr.build_")?.lowerBound,
+               let stringContainingName = responseString?[startIndex..<responseString!.endIndex],
+               let endIndex = stringContainingName.range(of: "<")?.lowerBound,
+               let nostrBuildImageName = responseString?[startIndex..<endIndex] {
+                let nostrBuildURL = "https://nostr.build/i/\(nostrBuildImageName)"
+                return nostrBuildURL
+            } else {
+                return ""
+            }
+        case .nostrImg:
+            if let startIndex = responseString?.range(of: "https://i.nostrimg.com/")?.lowerBound,
+               let stringContainingName = responseString?[startIndex..<responseString!.endIndex],
+               let endIndex = stringContainingName.range(of: "\"")?.lowerBound,
+               let nostrBuildImageName = responseString?[startIndex..<endIndex] {
+                let nostrBuildURL = "\(nostrBuildImageName)"
+                return nostrBuildURL
+            } else {
+                return ""
+            }
+
+        }
+    }
+}