Asterisk AGI sample in bash

Asterisk AGI sample in bash, very interesting. Bash is great alternative in situation when external scripts must be executed to implement functionality Asterisk can’t do (and another option is Lua dialplan). I am using Ruby for the same purpose (Adhearsion or AsteriskRuby).

Anyways here is the AGI, very basic one but fully functional:

#!/bin/bash 
declare -a array 
while read -e ARG && [ "$ARG" ] ; do 
        array=(` echo $ARG | sed -e 's/://'`) 
        export ${array[0]}=${array[1]} 
done 

# following variables are available from asterisk 
echo $agi_request >&2 
echo $agi_channel >&2 
echo $agi_language >&2 
echo $agi_type >&2 
echo $agi_uniqueid >&2 
echo $agi_callerid >&2 
echo $agi_dnid >&2 
echo $agi_rdnis >&2 
echo $agi_context >&2 
echo $agi_extension >&2 
echo $agi_priority >&2 
echo $agi_enhanced >&2 

checkresults() { 
        while read line 
        do 
        case ${line:0:4} in 
        "200 " ) echo $line >&2 
                 return;; 
        "510 " ) echo $line >&2 
                 return;; 
        "520 " ) echo $line >&2 
                 return;; 
        *      ) echo $line >&2;; #keep on reading those Invlid command 
                                  #command syntax until "520 End ..." 
        esac 
        done 
} 

res=<SOME SCRIPT> 

echo "1.  Setting Variable 'Test Variable' ..." >&2 
echo "SET VARIABLE TestVariable \"$res\"" 
checkresults 

echo "=================== Complete ====================" >&2