From 14bbbd29bf3b38f2c7242ff4de9a2cdcfd8dbb48 Mon Sep 17 00:00:00 2001
From: Chris Li <chrisshwli@gmail.com>
Date: Fri, 24 Feb 2017 14:19:32 -0500
Subject: [PATCH] Cellular capability detection

---
 Kiwix-iOS/iOSExtensions.swift      | 16 ++++++++++++++++
 Kiwix/Kiwix-Bridging-Header.h      |  1 +
 Kiwix/Operations/UIProcedure.swift |  2 +-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/Kiwix-iOS/iOSExtensions.swift b/Kiwix-iOS/iOSExtensions.swift
index 1cd49ffa..70c1303a 100644
--- a/Kiwix-iOS/iOSExtensions.swift
+++ b/Kiwix-iOS/iOSExtensions.swift
@@ -60,3 +60,19 @@ extension Bundle {
         return (Bundle.main.object(forInfoDictionaryKey: kCFBundleVersionKey as String) as? String) ?? "Unknown"
     }
 }
+
+extension UIDevice {
+    class var hasCellularCapability: Bool {
+        // Get list of all interfaces on the local machine:
+        var ifaddr : UnsafeMutablePointer<ifaddrs>? = nil
+        if getifaddrs(&ifaddr) == 0 {
+            var ptr = ifaddr
+            while ptr != nil {
+                ptr = ptr!.pointee.ifa_next
+                let ifaName = String(utf8String: ptr!.pointee.ifa_name)
+                if ifaName == "pdp_ip0" {return true}
+            }
+        }
+        return false
+    }
+}
diff --git a/Kiwix/Kiwix-Bridging-Header.h b/Kiwix/Kiwix-Bridging-Header.h
index edada6d9..7d950bff 100644
--- a/Kiwix/Kiwix-Bridging-Header.h
+++ b/Kiwix/Kiwix-Bridging-Header.h
@@ -5,3 +5,4 @@
 #import "ZimReader.h"
 #import "ZimIndexer.h"
 
+#include <ifaddrs.h>
diff --git a/Kiwix/Operations/UIProcedure.swift b/Kiwix/Operations/UIProcedure.swift
index c918149b..5f8ed1d5 100644
--- a/Kiwix/Operations/UIProcedure.swift
+++ b/Kiwix/Operations/UIProcedure.swift
@@ -133,7 +133,7 @@ extension AlertProcedure {
             if book.state == .cloud {
                 alert.add(actionWithTitle: Localized.Library.download, style: .default) { _ in
                     OperationQueue.main.addOperation({
-                        if true {
+                        if UIDevice.hasCellularCapability {
                             UIQueue.shared.add(operation: download(context: context, bookID: book.id))
                         } else {
                             Network.shared.start(bookID: book.id, useWifiAndCellular: false)