post-to-webhook

#!/bin/bash

# This script is intended to be used after you stand up
# a webhook endpoint by running `terraform apply` in the
# terraform directory.

# Macs don't support `readlink -f` or `realpath`, so we
# implement our own version here with Python.
function realpath() {
    local path=$1

    python3 -c 'from sys import argv; from os import path; print(path.realpath(argv[1]))' "$path"
}

script_dir=$(dirname "$(realpath "$0")")

if [[ -z "$1" || "$1" == "-" ]]; then
    data_file='/dev/stdin'
else
    data_file=$(realpath "$1")
fi

cd "$script_dir"
tf_outputs='terraform/outputs'
webhook_url_file=$(realpath "$tf_outputs/webhook-url.txt")
webhook_key_file=$(realpath "$tf_outputs/x-webhook-tutorial-key.txt")

error=0
if [[ ! -f "$webhook_url_file" ]]; then
    echo "$0: error: expected to find file containing webhook URL at $webhook_url_file" >&2
    error=1
fi
if [[ ! -f "$webhook_key_file" ]]; then
    echo "$0: error: expected to find file containing webhook API key at $webhook_key_file" >&2
    error=1
fi

if [[ "$error" == 1 ]]; then
    echo "$0: running \`terraform apply\` from within the terraform/ directory of this repository will generate the appropriate files" >&2
    exit 1
fi

webhook_url=$(< "$webhook_url_file")
webhook_key=$(< "$webhook_key_file")

curl_output=$(
    curl -s -X POST \
        -H "X-Webhook-Tutorial-Key: $webhook_key" \
        --data "@${data_file}" \
        "$webhook_url"
)
echo "$curl_output"