adding config support for password via shared file

.gitignore

 /challenge/*.o
 /doorchallenge
+/dooris.conf

dooris.conf.sample

+password=sesamaenderdich

lock

 #!/bin/sh
+source shared
 
 echo "Initializing Space Systems..."
 echo "22" > /sys/class/gpio/unexport
@@ -9,7 +10,7 @@ echo "out" > /sys/class/gpio/gpio22/direction
 sleep 0.5
 echo "Open Communication Channel..."
 # Silent, Output to /dev/null, Timeout after 5s and retry 12 times, each doubling the waitingtime until ten minutes.
-curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=sesamaenderdich&action=close" &
+curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=${password}&action=close" &
 echo "Locking Space..."
 echo "1" > /sys/class/gpio/gpio22/value
 sleep 0.3

shared

+#!/bin/sh
+config="dooris.conf"
+
+# warn if local config file is missing
+if [ ! -f "${config}" ]; then
+	echo "WARNING: ${config} is missing!" >&2
+fi
+
+# get password config value in a safe way
+password="$(grep password ${config} 2>/dev/null|cut -d= -f2|tr -d ' \t')"
+if [ -z "${password}" ]; then
+	echo "WARNING: password in ${config} is missing!" >&2
+fi

unlock

 #!/bin/sh
+source shared
 
 echo "Initializing Space Systems..."
 echo "27" > /sys/class/gpio/unexport
@@ -8,7 +9,7 @@ echo "Securing Communication to Space Systems..."
 echo "out" > /sys/class/gpio/gpio27/direction
 sleep 0.5
 echo "Open Communication Channel..."
-curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=sesamaenderdich&action=open" &
+curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=${password}&action=open" &
 echo "Unlocking Space..."
 echo "1" > /sys/class/gpio/gpio27/value
 sleep 0.3