st-dl-orig-shader

#! /bin/bash

set -e
set -u

if [[ $# -ne 1 ]] ; then
    echo "Usage: $0 <shadertoy-id-or-url>" >&2
    exit 1
fi

BASENAME="$(dirname "$0")"
SHADER_ID="$(sed -r 's@^https?://(www\.)?shadertoy\.com/view/@@' <<< "$1")"

CURL="curl"
JSON2FRAG="${BASENAME}/st-json2code"
REFERER_PREFIX="https://www.shadertoy.com/view"
USER_AGENT="shadertoy-player/1.0"
SHADERTOY_POST_URL="https://www.shadertoy.com/shadertoy"

POST_DATA="s={ \"shaders\" : [\"${SHADER_ID}\"] }"
REFERER="${REFERER_PREFIX}/${SHADER_ID}"

${CURL} \
    --silent \
    --user-agent "${USER_AGENT}" \
    --header "Referer: ${REFERER}" \
    --data-urlencode "${POST_DATA}" \
    "${SHADERTOY_POST_URL}" | "${JSON2FRAG}"