Error handling: Add info on the underlying system error to error alerts

Signed-off-by: Roopesh Chander <roop@roopc.net>

1 files changed, 91 insertions, 0 deletions

diff --git a/WireGuard/WireGuard/Tunnel/TunnelErrors.swift b/WireGuard/WireGuard/Tunnel/TunnelErrors.swift
new file mode 100644
index 0000000..889f0a7
--- /dev/null
+++ b/WireGuard/WireGuard/Tunnel/TunnelErrors.swift
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018 WireGuard LLC. All Rights Reserved.
+
+import NetworkExtension
+
+enum TunnelsManagerError: WireGuardAppError {
+    case tunnelNameEmpty
+    case tunnelAlreadyExistsWithThatName
+    case systemErrorOnListingTunnels(systemError: Error)
+    case systemErrorOnAddTunnel(systemError: Error)
+    case systemErrorOnModifyTunnel(systemError: Error)
+    case systemErrorOnRemoveTunnel(systemError: Error)
+
+    var alertText: AlertText {
+        switch self {
+        case .tunnelNameEmpty:
+            return ("No name provided", "Cannot create tunnel with an empty name")
+        case .tunnelAlreadyExistsWithThatName:
+            return ("Name already exists", "A tunnel with that name already exists")
+        case .systemErrorOnListingTunnels(let systemError):
+            return ("Unable to list tunnels", systemError.UIString)
+        case .systemErrorOnAddTunnel(let systemError):
+            return ("Unable to create tunnel", systemError.UIString)
+        case .systemErrorOnModifyTunnel(let systemError):
+            return ("Unable to modify tunnel", systemError.UIString)
+        case .systemErrorOnRemoveTunnel(let systemError):
+            return ("Unable to remove tunnel", systemError.UIString)
+        }
+    }
+}
+
+enum TunnelsManagerActivationAttemptError: WireGuardAppError {
+    case tunnelIsNotInactive
+    case anotherTunnelIsOperational(otherTunnelName: String)
+    case failedWhileStarting(systemError: Error) // startTunnel() throwed
+    case failedWhileSaving(systemError: Error) // save config after re-enabling throwed
+    case failedWhileLoading(systemError: Error) // reloading config throwed
+    case failedBecauseOfTooManyErrors(lastSystemError: Error) // recursion limit reached
+
+    var alertText: AlertText {
+        switch self {
+        case .tunnelIsNotInactive:
+            return ("Activation failure", "The tunnel is already active or in the process of being activated")
+        case .anotherTunnelIsOperational(let otherTunnelName):
+            return ("Activation failure", "Please disconnect '\(otherTunnelName)' before enabling this tunnel.")
+        case .failedWhileStarting(let systemError),
+             .failedWhileSaving(let systemError),
+             .failedWhileLoading(let systemError),
+             .failedBecauseOfTooManyErrors(let systemError):
+            return ("Activation failure", "The tunnel could not be activated. " + systemError.UIString)
+        }
+    }
+}
+
+enum TunnelsManagerActivationError: WireGuardAppError {
+    case activationFailed
+    case activationFailedWithExtensionError(title: String, message: String)
+    var alertText: AlertText {
+        switch self {
+        case .activationFailed:
+            return ("Activation failure", "The tunnel could not be activated. Please ensure that you are connected to the Internet.")
+        case .activationFailedWithExtensionError(let title, let message):
+            return (title, message)
+        }
+    }
+}
+
+extension Error {
+    var UIString: String {
+        if let systemError = self as? NEVPNError {
+            switch systemError {
+            case NEVPNError.configurationInvalid:
+                return "The configuration is invalid"
+            case NEVPNError.configurationDisabled:
+                return "The configuration is disabled"
+            case NEVPNError.connectionFailed:
+                return "The connection failed"
+            case NEVPNError.configurationStale:
+                return "The configuration is stale"
+            case NEVPNError.configurationReadWriteFailed:
+                return "Reading or writing the configuration failed"
+            case NEVPNError.configurationUnknown:
+                return "Unknown system error"
+            default:
+                return ""
+            }
+        } else {
+            return localizedDescription
+        }
+    }
+}