From b0bd27db3100850578fffdb46fdb146fa3456bc2 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sun, 25 Apr 2021 12:58:51 -0400
Subject: [PATCH] Fix crash when tapping non-HTTP(S) links with In-App Safari
 enabled

---
 Tusker/Info.plist                     |  7 ++++++-
 Tusker/TuskerNavigationDelegate.swift | 16 +++++++++++++---
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/Tusker/Info.plist b/Tusker/Info.plist
index f4d5d9eb..d07fd5e5 100644
--- a/Tusker/Info.plist
+++ b/Tusker/Info.plist
@@ -2,6 +2,11 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>LSApplicationQueriesSchemes</key>
+	<array>
+		<string>gopher</string>
+		<string>gemini</string>
+	</array>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleExecutable</key>
@@ -51,7 +56,7 @@
 	<key>NSMicrophoneUsageDescription</key>
 	<string>Post videos from the camera.</string>
 	<key>NSPhotoLibraryAddUsageDescription</key>
-	<string>Save photos directly from other people's posts.</string>
+	<string>Save photos directly from other people&apos;s posts.</string>
 	<key>NSPhotoLibraryUsageDescription</key>
 	<string>Post photos from the photo library.</string>
 	<key>NSUserActivityTypes</key>
diff --git a/Tusker/TuskerNavigationDelegate.swift b/Tusker/TuskerNavigationDelegate.swift
index 39d4c353..7f2a1b8a 100644
--- a/Tusker/TuskerNavigationDelegate.swift
+++ b/Tusker/TuskerNavigationDelegate.swift
@@ -46,16 +46,26 @@ extension TuskerNavigationDelegate {
     
     func selected(url: URL, allowUniversalLinks: Bool = true) {
         func openSafari() {
-            if Preferences.shared.useInAppSafari {
+            if Preferences.shared.useInAppSafari,
+               url.scheme == "https" || url.scheme == "http" {
                 let config = SFSafariViewController.Configuration()
                 config.entersReaderIfAvailable = Preferences.shared.inAppSafariAutomaticReaderMode
                 present(SFSafariViewController(url: url, configuration: config), animated: true)
-            } else {
+            } else if UIApplication.shared.canOpenURL(url) {
                 UIApplication.shared.open(url, options: [:])
+            } else {
+                var message = "The URL could not be opened."
+                if let scheme = url.scheme {
+                    message += " This can happen if you do not have an app installed for '\(scheme)://' URLs."
+                }
+                let alert = UIAlertController(title: "Invalid URL", message: message, preferredStyle: .alert)
+                alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
+                present(alert, animated: true)
             }
         }
         
-        if allowUniversalLinks && Preferences.shared.openLinksInApps {
+        if allowUniversalLinks && Preferences.shared.openLinksInApps,
+           url.scheme == "https" || url.scheme == "http" {
             UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { (success) in
                 if (!success) {
                     openSafari()