[libgweather] Switch to new METAR data provider

[Giovanni Campagna <gcampagna src gnome org>]

commit 283afc2d23355def1c1bab70a641f40cea52ba7f
Author: Frank Dana <ferdnyc gmail com>
Date:   Wed Aug 24 19:19:00 2016 -0700

    Switch to new METAR data provider
    
    NOAA shut down their METAR service, so we need to switch to their
    recommended service, aviationweather.gov, for our data.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770321

 libgweather/weather-metar.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)
---
diff --git a/libgweather/weather-metar.c b/libgweather/weather-metar.c
index 2263b82..9d782da 100644
--- a/libgweather/weather-metar.c
+++ b/libgweather/weather-metar.c
@@ -580,7 +580,7 @@ metar_finish (SoupSession *session, SoupMessage *msg, gpointer data)
 
     loc = &priv->location;
 
-    searchkey = g_strdup_printf ("\n%s", loc->code);
+    searchkey = g_strdup_printf ("<raw_text>%s", loc->code);
     p = strstr (msg->response_body->data, searchkey);
     g_free (searchkey);
     if (p) {
@@ -592,8 +592,8 @@ metar_finish (SoupSession *session, SoupMessage *msg, gpointer data)
            metar = g_strdup (p);
        success = metar_parse (metar, info);
        g_free (metar);
-    } else if (!strstr (msg->response_body->data, "National Weather Service")) {
-       /* The response doesn't even seem to have come from NWS...
+    } else if (!strstr (msg->response_body->data, "aviationweather.gov")) {
+       /* The response doesn't even seem to have come from NOAA...
         * most likely it is a wifi hotspot login page. Call that a
         * network error.
         */
@@ -620,8 +620,14 @@ metar_start_open (GWeatherInfo *info)
     loc = &priv->location;
 
     msg = soup_form_request_new (
-       "GET", "http://weather.noaa.gov/mgetmetar.php";,
-       "cccc", loc->code,
+       "GET", "https://www.aviationweather.gov/adds/dataserver_current/httpparam";,
+       "dataSource", "metars",
+       "requestType", "retrieve",
+       "format", "xml",
+       "hoursBeforeNow", "3",
+       "mostRecent", "true",
+       "fields", "raw_text",
+       "stationString", loc->code,
        NULL);
     _gweather_info_begin_request (info, msg);
     soup_session_queue_message (priv->session, msg, metar_finish, info);