Bash script used to call HTTP/JSON api

api

#!/usr/bin/env bash

CURL=$(which curl)
if [[ ! -x "${CURL}" ]]; then
  echo "Missing dependency. Please install curl (https://formulae.brew.sh/formula/curl):
  $ brew install curl" 1>&2
  exit 1
fi

readonly PROGRAM=$(basename -- $0)

method="POST"
hostname="localhost"
port="9200"

readonly USAGE="
USAGE: $PROGRAM [OPTIONS] <API PATH> [FILE]

Examples:

- POST a 'pre-invoice' to get totals:
  $ $PROGRAM /api/invoice/totals ./prefacture.json

- GET the list of products:
  $ $PROGRAM -m GET /api/product

- POST an invoice:
  $ $PROGRAM /api/invoice ./facture.json

- POST a 'pre-invoice' to get totals, pretty print it
  (requires jq, 'brew install jq') and store it in a file:
  $ $PROGRAM /api/invoice/totals ./prefacture.json | jq > facture-with-totals.json


Options:
  -h                     Displays this message.
  -n <host name>         Optional. Defaults to '$hostname'.
  -p <port number>       Optional. Defaults to '$port'.
  -m <HTTP method>       Optional. Defaults to '$method' Uses curl syntax."

OPTIND=1
while getopts ":hm:n:p:" opt; do
  case $opt in
    m ) method="${OPTARG}" ;;
    n ) hostname="${OPTARG}" ;;
    p ) port="${OPTARG}" ;;
    h )
      echo "${USAGE}"
      exit 0 ;;
    \?)
      echo "Invalid option -${OPTARG}." 1>&2
      echo "${USAGE}"
      exit 1 ;;
  esac
done
shift "$(( OPTIND - 1 ))"

readonly API_PATH=$1
if [[ -z "${API_PATH}" ]]; then
  echo "Missing API path." 1>&2
  echo "${USAGE}"
  exit 1
fi

readonly FILE=$2
if [[ -z "${FILE}" && "${method}" == "POST" ]]; then
  echo "Missing FILE." 1>&2
  echo "${USAGE}"
  exit 1
fi

$CURL -H 'Content-Type: application/json' \
  -s \
  -X "${method}" \
  -d @"${FILE}" http://"${hostname}":${port}${API_PATH}