A REST client written in Bash

restbash

#!/usr/bin/env bash
# Usage: {script} SCRIPT
#
#   --dry-run   Displays the request but doesn't not perform it.
#
# Report bugs to Henrique Moody <henriquemoody@gmail.com>
#

if [[ -z "${1}" ]] || [[ ! -f "${1}" ]]; then
    sed -E 's/^#\s?(.*)/\1/g' "${0}" |
        sed -nE "/^Usage/,/^Report/p" |
        sed "s/{script}/$(basename "${0}")/g" |
        cat 1>&2
    exit 1
fi

declare FILE_NAME="${1}"
declare FILE_FIRSTLINE=$(head -n1 "${FILE_NAME}")
declare MESSAGE_HEAEDER=""
declare MESSAGE_BODY=$(sed -nE '/^$/,//p' "${FILE_NAME}" | sed -E '/^$/d')
declare MESSAGE_LEGTH=$(echo "${MESSAGE_BODY}" | wc -c)
declare MESSAGE=""


declare VERB=$(echo "${FILE_FIRSTLINE}" | sed -E 's,^([A-Z]+) .+,\1,g')
declare URI=$(echo "${FILE_FIRSTLINE}" | sed -E 's,^[A-Z]+ .+://[^/]+(/.+),\1,g')
declare HOST=$(echo "${FILE_FIRSTLINE}" | sed -E 's,^[A-Z]+ .+://([^/]+)/.+,\1,g')

declare HOSTNAME=$(echo "${HOST}" | sed -E 's,([^:]+)(:[0-9]+)?,\1,')
declare PORT=$(echo "${HOST}" | sed -E 's,([^:]+)(:([0-9]+))?,\3,')

if [[ -z "${PORT}" ]]; then
    PORT=80
fi

MESSAGE_LEGTH=$[MESSAGE_LEGTH - 1]

MESSAGE_HEAEDER+="${VERB} ${URI} HTTP/1.1\n"
MESSAGE_HEAEDER+="Host: ${HOST}\n"
MESSAGE_HEAEDER+="Connection: close\n"
MESSAGE_HEAEDER+="User-Agent: restbash\n"
MESSAGE_HEAEDER+="Content-Length: ${MESSAGE_LEGTH}\n"
MESSAGE_HEAEDER+="$(sed -nE '/^[A-Z]+/,/^$/p' "${FILE_NAME}" | sed -E '/^$/d' | grep -v "${FILE_FIRSTLINE}")"

MESSAGE="${MESSAGE_HEAEDER}\n${MESSAGE_BODY}"

if [[ "${2}" == '--dry-run' ]]; then
    echo -e "${MESSAGE}"
    exit
fi

echo -e "${MESSAGE}" | nc "${HOSTNAME}" ${PORT}

test.restbash

POST http://httpbin.org/post

foo=1&bar=2