feature: add "aredn alerts" feature in header (#505)

* feature: add "aredn alerts" feature in header

* optimize conditional logic

* additional fixes

* improve presentation display

files/etc/crontabs/root

@@ -2,4 +2,5 @@
 * * * * * /usr/local/bin/rssi_monitor
 * * * * * /usr/local/bin/snrlog
 * * * * * /usr/local/bin/clean_zombie.sh
+0 */12 * * * /usr/local/bin/aredn_message.sh
 

files/usr/local/bin/aredn_message.sh

@@ -0,0 +1,64 @@
+#!/bin/sh
+true <<'LICENSE'
+  Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
+  Copyright (C) 2020 Darryl Quinn K5DLQ
+  See Contributors file for additional contributors
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation version 3 of the License.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+  Additional Terms:
+
+  Additional use restrictions exist on the AREDN(TM) trademark and logo.
+    See AREDNLicense.txt for more info.
+
+  Attributions to the AREDN Project must be retained in the source code.
+  If importing this code into a new or existing project attribution
+  to the AREDN project must be added to the source code.
+
+  You must not misrepresent the origin of the material contained within.
+
+  Modified versions must be modified to attribute to the original source
+  and be marked in reasonable ways as differentiate it from the original
+  version.
+
+LICENSE
+
+# does the node have access to downloads.arednmesh.org
+ping -q -W10 -c1 downloads.arednmesh.org > /dev/null && 
+  online=true;
+  [ -f /tmp/aredn_message ] && 
+  rm /tmp/aredn_message
+
+
+if [ $online = "true" ] 
+then
+  # fetch node specific message file
+  # nodename=$(echo "$HOSTNAME" | tr 'A-Z' 'a-z')
+  nodename=$(echo "$HOSTNAME" | tr 'A-Z' 'a-z')
+  wget -q -O aredn_message -P /tmp http://downloads.arednmesh.org/messages/"${nodename}".txt
+  echo "<strong>(${nodename}):</strong>"|cat - /tmp/aredn_message > /tmp/out && mv /tmp/out /tmp/aredn_message
+  if [ $? -ne 0 ] # no node specific file
+  then
+    # fetch broadcast message file
+    wget -q -O aredn_message -P /tmp http://downloads.arednmesh.org/messages/all.txt
+    echo "<strong>(QST):</strong>"|cat - /tmp/aredn_message > /tmp/out && mv /tmp/out /tmp/aredn_message
+  else
+    # need to append to node file
+    wget -q -O aredn_message_all -P /tmp http://downloads.arednmesh.org/messages/all.txt &&
+      echo "<strong>(QST):</strong>"|cat - /tmp/aredn_message_all > /tmp/out && mv /tmp/out /tmp/aredn_message_all
+      echo "<br />" >> /tmp/aredn_message;
+      cat /tmp/aredn_message_all >> /tmp/aredn_message;
+      rm /tmp/aredn_message_all;
+  fi
+fi
+

files/www/cgi-bin/perlfunc.pm

@@ -1877,6 +1877,9 @@ sub is_hardware_supported
 # Needs to be renamed from alert_banner
 sub alert_banner
 {
+  # if /tmp/aredn_message file exists, then read and set $aredn_message to contents
+  $aredn_message = `cat /tmp/aredn_message` if( -f "/tmp/aredn_message");
+
   print "<div class=\"TopBanner\">";
 
   #AREDN Banner
@@ -1894,6 +1897,7 @@ sub alert_banner
       print "<div style=\"padding:5px;background-color:#FFFF00;border:1px solid #ccc;width:600px;\"><a href=\"/cgi-bin/sysinfo\">!!!! UNTESTED HARDWARE !!!!</a></div>\n";
     }
   }
+  print "<div style=\"padding:5px;background-color:#FFFF00;border:1px solid #ccc;width:600px;\"><strong>AREDN Alert(s):</strong><br /><div style=\"text-align:left;\">$aredn_message</div></div>\n" if $aredn_message;
 
   #TopBanner
   print "</div>";