Fix UVMeter due to changed URL and BOM

The URL which exports the real time UV data has changed to an HTTPS
address. Since the HTTP package does not support HTTPS URLs, use
http-conduit to retrieve the XML document.

Unfortunately, the XML documents XML declaration precedes a byte order
mark which the previous XML parser was unable to handle. We're simply
ignoring the BOM in order to get to the UV values.

3 files changed, 20 insertions, 11 deletions

diff --git a/readme.md b/readme.md
index 64269fe..359ca17 100644
--- a/readme.md
+++ b/readme.md
@@ -158,7 +158,8 @@ Otherwise, you'll need to install them yourself.
      Requires the [libXpm] C library.
 
 `with_uvmeter`
-:    Enables UVMeter plugin. The plugin shows UV data for Australia.
+:    Enables UVMeter plugin. The plugin shows UV data for Australia. Requires
+     `with_conduit` to connect to HTTPS URLs.
 
 `with_weather`
 :    Support to display weather information. Enables Weather plugin.
diff --git a/src/Plugins/Monitors/UVMeter.hs b/src/Plugins/Monitors/UVMeter.hs
index b0f5ac3..4d90846 100644
--- a/src/Plugins/Monitors/UVMeter.hs
+++ b/src/Plugins/Monitors/UVMeter.hs
@@ -18,11 +18,14 @@ module Plugins.Monitors.UVMeter where
 import Plugins.Monitors.Common
 
 import qualified Control.Exception as CE
-import Control.Applicative hiding ((<|>),many)
-import Network.HTTP
+import Network.HTTP.Conduit
+       (parseRequest, newManager, tlsManagerSettings, httpLbs,
+        responseBody)
+import Data.ByteString.Lazy.Char8 as B
 import Text.Read (readMaybe)
 import Text.Parsec
 import Text.Parsec.String
+import Control.Monad (void)
 
 
 uvConfig :: IO MConfig
@@ -35,14 +38,18 @@ newtype UvInfo = UV { index :: String }
     deriving (Show)
 
 uvURL :: String
-uvURL = "http://www.arpansa.gov.au/uvindex/realtime/xml/uvvalues.xml"
+uvURL = "https://uvdata.arpansa.gov.au/xml/uvvalues.xml"
 
 getData :: IO String
-getData = do
-    let request = getRequest uvURL
-    CE.catch (simpleHTTP request >>= getResponseBody) errHandler
-    where errHandler :: CE.IOException -> IO String
-          errHandler _ = return "<Could not retrieve data>"
+getData =
+  CE.catch (do request <- parseRequest uvURL
+               manager <- newManager tlsManagerSettings
+               res <- httpLbs request manager
+               return $ B.unpack $ responseBody res)
+           errHandler
+  where errHandler
+          :: CE.SomeException -> IO String
+        errHandler _ = return "<Could not retrieve data>"
 
 textToXMLDocument :: String -> Either ParseError [XML]
 textToXMLDocument = parse document ""
@@ -123,7 +130,7 @@ tag  = do
 
 xmlDecl :: Parser XML
 xmlDecl = do
-    string "<?xml"
+    void $ manyTill anyToken (string "<?xml") -- ignore the byte order mark
     decl <- many (noneOf "?>")
     string "?>"
     return (Decl decl)
diff --git a/xmobar.cabal b/xmobar.cabal
index d03bdb3..9fa4cf2 100644
--- a/xmobar.cabal
+++ b/xmobar.cabal
@@ -201,6 +201,7 @@ executable xmobar
           build-depends: http-conduit, http-types
           cpp-options: -DHTTP_CONDUIT
 
-    if flag(with_uvmeter)
+    if flag(with_uvmeter) && flag(with_conduit)
        other-modules: Plugins.Monitors.UVMeter
+       build-depends: http-conduit, http-types
        cpp-options: -DUVMETER