#!/bin/sh

# This example demonstrates how to read the hook event details
# from stdout, output debug messages, and reject a new upload based
# on custom constraints. Here, an upload will be rejected if the
# filename metadata is missing. Remove the following `exit 0` line
# to activate the constraint:
exit 0

hasFilename="$(cat /dev/stdin | jq '.Event.Upload.MetaData | has("filename")')"

# We use >&2 to write debugging output to stderr. tusd
# will forward these to its stderr. Any output from the
# hook on stdout will be captured by tusd and interpreted
# as a response.
echo "Filename exists: $hasFilename" >&2

if [ "$hasFilename" == "false" ]; then

  # If the condition is not met, output a JSON object on stdout,
  # that instructs tusd to reject the upload and respond with a custom
  # HTTP error response.
  cat <<END
  {
    "RejectUpload": true,
    "HTTPResponse": {
      "StatusCode": 400,
      "Body": "no filename provided"
    }
  }
END

  # It is important that the hook exits with code 0. Otherwise, tusd
  # assumes the hook has failed and will print an error message about
  # the hook failure.
  exit 0
fi