Initial version of Bitcoin Widgets iOS application

.gitignore

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+xcuserdata/

App/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "color" : {
+        "platform" : "universal",
+        "reference" : "systemOrangeColor"
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

App/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "BitcoinWidgets_40px-2.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "BitcoinWidgets_60px.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "BitcoinWidgets_58px.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "BitcoinWidgets_87px.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "BitcoinWidgets_80px.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "BitcoinWidgets_120px-1.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "BitcoinWidgets_120px.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "filename" : "BitcoinWidgets_180px.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "filename" : "BitcoinWidgets_20px.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "BitcoinWidgets_40px-1.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "BitcoinWidgets_29px.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "BitcoinWidgets_58px-1.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "BitcoinWidgets_40px.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "BitcoinWidgets_80px-1.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "BitcoinWidgets_76px.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "filename" : "BitcoinWidgets_152px.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "filename" : "BitcoinWidgets_167px.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "filename" : "BitcoinWidgets_1024px.png",
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

App/Assets.xcassets/Bitcoin.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "Bitcoin.svg",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

App/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

App/Assets.xcassets/LaunchScreenBackground.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0x00",
+          "green" : "0x00",
+          "red" : "0x00"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

App/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UILaunchScreen</key>
+	<dict>
+		<key>UIColorName</key>
+		<string>LaunchScreenBackground</string>
+		<key>UIImageName</key>
+		<string>Bitcoin</string>
+		<key>UIImageRespectsSafeAreaInsets</key>
+		<true/>
+	</dict>
+	<key>ITSAppUsesNonExemptEncryption</key>
+	<false/>
+	<key>NSUserActivityTypes</key>
+	<array>
+		<string>ConfigurationIntent</string>
+	</array>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+	</dict>
+</dict>
+</plist>

App/Sources/BitcoinWidgetsApp.swift

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+import SwiftUI
+
+@main
+struct BitcoinWidgetsApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+                .preferredColorScheme(.dark)
+        }
+    }
+}

App/Sources/ContentView.swift

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+import SwiftUI
+
+struct ContentView: View {
+
+    var body: some View {
+        VStack {
+            HStack {
+                Image(uiImage: UIImage(named: "AppIcon")!)
+                    .resizable()
+                    .frame(width: 29, height: 29)
+                Text("Bitcoin Widgets")
+                    .font(.title)
+            }.padding()
+            List {
+                Section(header: Text("Add to Today View").font(.title2)) {
+                    Label("From the Home Screen, swipe right to access the Today View.", systemImage: "1.circle.fill")
+                    Label("Scroll down and tap the Edit button, then tap the Add button in the upper-left corner.", systemImage: "2.circle.fill")
+                    Label("Look up Bitcoin Widgets, then choose desired widget and size.", systemImage: "3.circle.fill")
+                    Label("Tap Add Widget, then tap Done.", systemImage: "4.circle.fill")
+                }
+                Section(header: Text("Add to Home Screen").font(.title2)) {
+                    Label("From the Home Screen, touch and hold a widget or an empty area until the apps jiggle.", systemImage: "1.circle.fill")
+                    Label("Tap the Add button in the upper-left corner.", systemImage: "2.circle.fill")
+                    Label("Look up Bitcoin Widgets, then choose desired widget and size.", systemImage: "3.circle.fill")
+                    Label("Tap Add Widget, then tap Done.", systemImage: "4.circle.fill")
+                }
+                Section(header: Text("Configure").font(.title2)) {
+                    Label("Touch and hold a widget until menu appears, then tap Edit Widget.", systemImage: "1.circle.fill")
+                    Label("Provide required properties, then tap anywhere when done.", systemImage: "2.circle.fill")
+                }
+                Section(header: Text("Find out more").font(.title2)) {
+                    LabelLink("Source code", url: "https://github.com/yanascz/bitcoin-widgets-ios", systemImage: "chevron.left.forwardslash.chevron.right")
+                    LabelLink("Issue tracking", url: "https://github.com/yanascz/bitcoin-widgets-ios/issues",
+                        systemImage: "ladybug.fill")
+                }
+            }.listStyle(.plain)
+        }
+    }
+
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}

App/Sources/LabelLink.swift

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+import SwiftUI
+
+struct LabelLink: View {
+
+    let title: String
+    let destination: URL
+    let systemImage: String
+
+    init (_ title: String, url: String, systemImage: String) {
+        self.title = title
+        self.destination = URL(string: url)!
+        self.systemImage = systemImage
+    }
+
+    var body: some View {
+        Label {
+            HStack {
+                Link(title, destination: destination)
+                Spacer()
+                Image(systemName: "chevron.right")
+                    .foregroundColor(.secondary)
+            }
+        } icon: {
+            Image(systemName: systemImage)
+        }
+    }
+
+}

BitcoinClient/Sources/BitcoinClient.swift

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+import Foundation
+import Network
+
+class BitcoinClient {
+
+    private let urlSession = URLSession.init(configuration: .ephemeral)
+
+    private let host: String
+    private let port: Int
+
+    init(host: String, port: Int) {
+        self.host = host
+        self.port = port
+    }
+
+    func getVersionMessage() async throws -> VersionMessage {
+        let streamTask = urlSession.streamTask(withHostName: host, port: port)
+        streamTask.resume()
+
+        try await streamTask.write(clientVersionMessage)
+
+        guard let headerData = try await streamTask.readData(length: MessageHeader.size) else {
+            throw BitcoinClientError.communicationFailure
+        }
+
+        let header = MessageHeader(from: headerData)
+
+        guard header.magicNumber == MagicNumber.main.rawValue else {
+            throw BitcoinClientError.invalidMagicNumber
+        }
+        guard header.command == VersionMessage.command else {
+            throw BitcoinClientError.protocolViolation
+        }
+
+        guard let messageData = try await streamTask.readData(length: Int(header.payloadSize)) else {
+            throw BitcoinClientError.communicationFailure
+        }
+        guard messageData.checksum == header.payloadChecksum else {
+            throw BitcoinClientError.protocolViolation
+        }
+
+        return VersionMessage(from: messageData)
+    }
+
+    private var clientVersionMessage: VersionMessage {
+        return VersionMessage(
+            protocolVersion: 70001,
+            userAgent: "/BitcoinClient:1.0.0/",
+            timestamp: Date.now,
+            nonce: UInt64.random(in: UInt64.min...UInt64.max)
+        )
+    }
+
+}
+
+enum BitcoinClientError: Error {
+    case communicationFailure
+    case invalidMagicNumber
+    case protocolViolation
+}