Add offline mode

CapCollector/Data/Database.swift

@@ -145,6 +145,16 @@ final class Database {
         }
     }
     
+    var isInOfflineMode: Bool {
+        set {
+            UserDefaults.standard.set(newValue, forKey: Upload.offlineKey)
+            log("Offline mode set to \(newValue)")
+        }
+        get {
+            UserDefaults.standard.bool(forKey: Upload.offlineKey)
+        }
+    }
+    
     // MARK: Data updates
     
     /**
@@ -168,6 +178,10 @@ final class Database {
             log("Cap image not saved")
             return false
         }
+        guard !isInOfflineMode else {
+            log("Offline mode: Not uploading cap")
+            return true
+        }
         upload.upload(name: name, for: cap.id) { success in
             guard success else {
                 return
@@ -224,6 +238,10 @@ final class Database {
             log("Failed to add cap \(cap) version \(version) to upload queue")
             return false
         }
+        guard !isInOfflineMode else {
+            log("Offline mode: Not uploading cap image")
+            return true
+        }
         upload.uploadImage(for: cap, version: version) { actualVersion in
             guard let actualVersion = actualVersion else {
                 self.log("Failed to upload image \(version) for cap \(cap)")

CapCollector/Data/Upload.swift

@@ -12,6 +12,8 @@ import SQLite
 
 struct Upload {
     
+    static let offlineKey = "offline"
+    
     let serverUrl: URL
        
     let table = Table("uploads")