From 40debb9634c9e3f77b9958cb20bf0c89a9465704 Mon Sep 17 00:00:00 2001
From: "byte[]" <byteslice@airmail.cc>
Date: Fri, 20 Dec 2019 09:19:43 -0500
Subject: [PATCH] add viewport meta hook

---
 .../templates/layout/app.html.slime              |  3 ++-
 lib/philomena_web/views/layout_view.ex           | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/philomena_web/templates/layout/app.html.slime b/lib/philomena_web/templates/layout/app.html.slime
index 7d388074..c97f2161 100644
--- a/lib/philomena_web/templates/layout/app.html.slime
+++ b/lib/philomena_web/templates/layout/app.html.slime
@@ -3,7 +3,8 @@ html lang="en"
   head
     meta charset="utf-8"
     meta http-equiv="X-UA-Compatible" content="IE=edge"
-    meta name="viewport" content="width=device-width, initial-scale=1"
+    = viewport_meta_tag(@conn)
+
     title
       = if assigns[:title] do
         => assigns[:title]
diff --git a/lib/philomena_web/views/layout_view.ex b/lib/philomena_web/views/layout_view.ex
index e9107e40..9c9715f0 100644
--- a/lib/philomena_web/views/layout_view.ex
+++ b/lib/philomena_web/views/layout_view.ex
@@ -117,4 +117,20 @@ defmodule PhilomenaWeb.LayoutView do
 
   def manages_bans?(conn),
     do: can?(conn, :create, Philomena.Bans.User)
+
+  def viewport_meta_tag(conn) do
+    ua = get_user_agent(conn)
+
+    case String.contains?(ua, ["Mobile", "webOS"]) do
+      true   -> tag(:meta, name: "viewport", content: "width=device-width, initial-scale=1")
+      _false -> tag(:meta, name: "viewport", content: "width=1024, initial-scale=1")
+    end
+  end
+
+  defp get_user_agent(conn) do
+    case Plug.Conn.get_req_header(conn, "user-agent") do
+      [ua] -> ua
+      _    -> ""
+    end
+  end
 end