Upload images to Imgur from a file or URL

imgur

#!/usr/bin/env bash

# Uploads an image to imgur.com from either a local file or from a URL passed on the command line or to stdin,
# and prints the imgur.com URL to stdout.
#
# Examples:
#
# imgur foo.png
# imgur http://example.com/foo.jpg
# echo foo.png | imgur
# echo http://example.com/foo.jpg | imgur

# Exit on first error
set -e

# Debug
#set -x

validfile() { [[ -r ${1} ]]; }

validurl ()
{
  # Read the first byte from the URL
  if curl --insecure --output /dev/null  --silent --fail -r 0-0 "${1}"; then
     return 0
  else
     return 1
  fi
}

installed () { command -v "${1}" >/dev/null 2>&1 || { >&2 echo "Cannot execute the ${1} command"; exit 1; } }

installed jq
installed curl

# Get the file path or URL from the command line argument or from stdin.
[[ $# -ge 1 ]] && input="${1}" || input=$(cat)

if [[ -z ${input} ]]; then
   >&2 echo "No filename or was provided"
   exit 1
fi

img_file=

if validfile "${input}"; then
  img_file="${input}"
elif validurl "${input}"; then
  # Download it to a tmp file.
  tmpfile=$(mktemp /tmp/imgur-XXXXXX)
  curl --insecure --location --output "${tmpfile}" --silent "${input}"

  # Remove the tmp file when we're done.
  trap 'rm -f ${tmpfile}' EXIT INT

  img_file="${tmpfile}"
else
  >&2 echo "${input} cannot be read"
  exit 1
fi

content_type=$(file --brief --mime-type "${img_file}")

filename=$(basename -- "${img_file}")

curl --insecure -X POST "https://imgur.com/upload" \
  -H "Referer: http://imgur.com/upload" \
  -H "Accept: application/json" \
  -F "Filedata=@\"${img_file}\";filename=${filename};type=${content_type}" \
 | jq -r '.data | .hash, .ext' | xargs printf "https://i.imgur.com/%s%s\n"

exit 0