Download the og:image from a URL

get-ogimage

#!/bin/bash

set -eo pipefail

if [ $# -eq 0 ]; then
	echo "Please provide a URL"
	echo "$(basename $0) URL"
	exit 1
fi

if ! command -v pup > /dev/null
then
  echo "pup command is required"
  echo "install from https://github.com/ericchiang/pup"
  exit 1
elif ! command -v curl > /dev/null
then
  echo "curl command is required"
  exit 1
fi

download_img() {
	curl -s --output "og-image-${FILENAME_INCREMENT}.${IMG_EXT}" "${IMG_URL}"
}

# main loop
FILENAME_INCREMENT=1
for URL in "$@"; do
	# get <meta og:image> from page
	IMG_URL=$(curl -s "${URL}" \
		| pup 'meta[property="og:image"] attr{content}')
	IMG_URL="${IMG_URL%\?*}"
	IMG_EXT="${IMG_URL##*.}"
	download_img
	FILENAME_INCREMENT=$((FILENAME_INCREMENT+1))
done