Mail Gun API shell script for sending mail

mgmail.sh

#!/bin/bash

mgmail()
(    
    dflt_to="xxx@gmail.com"
    dflt_froma="xxx@example.com"
    dflt_sub="notice from admin"
    dflt_text="default text"
    mailgun_domain="example.com"
    keyfile="./privatekey.txt"

    if [ $(whoami) != "root" ]; then
        echo "You must be root to use this utility, but you are just ${whoami}"
        exit 1
    fi
    
    if [[ ! -f $keyfile ]]; then
        echo "ERROR: no file $keyfile"
        exit 1
    fi
    key=$(cat $keyfile | tr -d '\n')  
    
    cmda=( curl -s \
           --user "api:${key}" \
           "https://api.mailgun.net/v3/${mailgun_domain}/messages" )

    Debug=0
    Vb=0
    tos=()
    fromn=""
    froma=$dflt_froma
    subject=${dflt_sub}


    while [[ ${#@} -gt 0 ]] ; do
        case $1 in
            -h|--help)
                echo "usage ..."
                exit 0
                ;;
            -v|--verbose)
                Vb=1
                shift
                ;;
            -d|--debug)
                Debug=1
                shift;
                ;;
            -dd|--debug2)
                Debug=2
                shift;
                ;;
            -to|--to-addr)
                tos+=($2)
                shift; shift;
                ;;
            -fn|--from-name)
                fromn="$2"
                shift; shift;
                ;;
            -fa|--from-addr)
                froma="$2"
                shift; shift;
                ;;
            -su|--subject)
                subject="$2"
                shift; shift;
                ;;
            *)
                break
                ;;
        esac
    done
    
    cmda+=( -F "from=${fromn} <${froma}>" ) # critical to leave a space before '<'   

    if [[ ${#tos[@]} -eq 0 ]]; then
        tos=(${dflt_to})
    fi
    for t in ${tos[@]} ; do
        cmda+=( -F "to=${t}" )
    done

    cmda+=( -F "subject=${subject}" )

    body=()
    
    while [[ ${#@} -gt 0 ]]; do
        case $1 in
            -ts|--text-string)
                body+=( -F "text='$2'" )
                shift; shift;
                ;;
            -tr|--text-read-from-file)
                body+=( -F "text=<$2" )
                shift; shift;
                ;;
            -ti|--text-stdin)
                body+=( -F "text=<-" )
                shift; # only one shift!
                ;;
            *)
                break
                ;;
        esac
    done
    
    if [[ ${#body[@]} -eq 0 ]]; then
        body=( -F "text=${dflt_text}" )
    fi

    case $1 in
        -at|--attachment)
            body+=( -F "attachment=@$2" )
            shift; shift;
            ;;
        *) body+=( "${@}" ) # body gets the remainder 
    esac

    cmda+=("${body[@]}")
        
    if [[ $Debug -ne 0 ]]; then 
        for x in "${cmda[@]}" ; do
            echo $x
        done
        echo "${cmda[@]}"
    fi
    if [[ $Debug -gt 1 ]]; then
        exit 0
    fi

    tmpfile=$(mktemp /tmp/s2j9x3l4.XXXXXX)
    #exec 3<> "$tmpfile"
    #rm -f "$tmpfile"    

    "${cmda[@]}" > $tmpfile 
    rc=$?
    cnt=$(/bin/grep -c -e '"id":' $tmpfile)
    #cat $tmpfile
    if [[ $rc -ne 0 ]] || [[ $cnt -eq 0 ]]; then
        echo "ERROR: return code $rc" >&2
        echo "ERROR: message:" >&2
        cat $tmpfile >&2
        rc=1
    else
        if [[ $Vb -ne 0 ]]; then 
            echo "SUCCESS"
            cat $tmpfile
        fi
    fi
    rm -f "$tmpfile"
    exit $rc
 )

   
  # EXAMPLE
  # curl -s --user 'api:YOUR_API_KEY' \
  #   https://api.mailgun.net/v3/YOUR_DOMAIN_NAME/messages \
  #   -F from='Excited User <mailgun@YOUR_DOMAIN_NAME>' \
  #   -F to=YOU@YOUR_DOMAIN_NAME \
  #   -F to=bar@example.com \
  #   -F subject='Hello' \
  #   -F text='Testing some Mailgun awesomeness!' \
  #   -F html='Testing some Mailgun awesomeness!'
  
TEST_mgmail()
(
    tmpfile=$(mktemp /tmp/test.XXXXXX)
    echo "test text" > $tmpfile
    
    mgmail -v
    mgmail -v -ts 'test string'
    mgmail -v -ti < $tmpfile
    mgmail -v -tr $tmpfile
    mgmail -v -at $tmpfile
    mgmail -v -F o:deliverytime='Fri, 14 Oct 2011 23:10:10 -0000'
    
)