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#!/bin/bash

# Copyright (c) 2012-2013 Kaarle Ritvanen
# See LICENSE file for license details

function _acf_req {
    local url=$ACF_URL$1
    shift
    curl -s \
	${ACF_AUTH_TOKEN:+-H "X-ACF-Auth-Token: $ACF_AUTH_TOKEN"} \
	${ACF_TXN_ID:+-H "X-ACF-Transaction-ID: $ACF_TXN_ID"} \
	"$@" $url
    local code=$?
    echo
    return $code
}

function _acf_start_req {
    local url=$1
    local hdr=X-ACF-$2
    local var=ACF_$3
    shift 3

    local current=${!var}
    eval "export $var=\$(_acf_req \"\$url\" \"\$@\" \
        -D /proc/self/fd/1 -o /proc/self/fd/3 | \
	sed 's/^$hdr: \\(.\\+\\)'\$'\\r''\$/\\1/;ta;d;:a;q')"
    [ "${!var}" ] || exit

    bash --rcfile "$ACF_QD_CLI" && _acf_req $url -X DELETE

    eval $var=$current
}

if [ "$ACF_AUTH_TOKEN" ]; then

    if [ "$ACF_TXN_ID" ]; then
	cat >&2 <<EOF
Transaction $ACF_TXN_ID started
Type 'commit' to commit, 'exit' to abort

EOF
    else
	cat >&2 <<EOF
Available commands:
  Fetch object:          get <path>
  Create/update object:  put <path> <JSON content>
  Add member to set:     post <path> <JSON content>
  Delete object:         delete <path>
  Start transaction:     start

Example: put /awall/zone/internet '{"iface": ["eth0"]}'

EOF
    fi

    PS1="$ACF_USER@acf2-dev-shell${ACF_TXN_ID:+($ACF_TXN_ID)}> "

    function start {
	_acf_start_req / Transaction-ID TXN_ID -X POST
    }

    function _acf_obj_req {
	local path=/config$1
	shift
	_acf_req "$path" "$@"
    }

    function _acf_post_req {
	_acf_obj_req "$2" -d "$3" -X $1
    }

    function get {
	_acf_obj_req "$1"
    }

    function put {
	_acf_post_req PUT "$@"
    }

    function post {
	_acf_post_req POST "$@"
    }

    function delete {
	_acf_obj_req "$1" -X DELETE
    }

    function commit {
	if [ "$ACF_TXN_ID" ]; then
	    if _acf_req / -X PUT; then
		echo Committed >&2
		exit 1
	    fi
	else
	    echo "No transaction started" >&2
	fi
	return 1
    }

else
    cat >&2 <<EOF
Development shell for ACF2
Copyright (c) 2012-2013 Kaarle Ritvanen

EOF

    exec 3>&1
    export ACF_QD_CLI=$0

    export ACF_URL=http://localhost
    export ACF_USER=`whoami`
    PASSWORD=

    function usage {
	echo "Usage: $0 [-H <server_url>] [-u <username>] [-p <password>]" >&2
	exit $1
    }

    ARGS=$(getopt -o hH:p:u: -- "$@")
    [ $? -gt 0 ] && usage 1
    eval set -- $ARGS

    while :; do
	case $1 in
	    -h)
		usage 0
		;;
	    -H)
		shift
		ACF_URL=$1
		;;
	    -p)
		shift
		PASSWORD=$1
		;;
	    -u)
		shift
		ACF_USER=$1
		;;
	    --)
		break
	esac
	shift
    done

    if [ -z "$PASSWORD" ]; then
	echo -n "Password: " >&2
	read PASSWORD
	echo >&2
    fi

    ACF_TXN_ID=

    _acf_start_req /login Auth-Token AUTH_TOKEN \
	-d "{\"username\": \"$ACF_USER\", \"password\": \"$PASSWORD\"}"
fi