#!/usr/bin/env bash
#
# Author: Stefan Buck
# License: MIT
# https://gist.github.com/stefanbuck/ce788fee19ab6eb0b4447a85fc99f447
#
#
# This script accepts the following parameters:
#
# * owner
# * repo
# * tag
# * filename
# * github_api_token
#
# Script to upload a release asset using the GitHub API v3.
#
# Example:
#
# upload-github-release-asset.sh github_api_token=TOKEN owner=stefanbuck repo=playground tag=v0.1.0 filename=./build.zip
#

# Check dependencies.
set -e

# Validate settings.
[ "$TRACE" ] && set -x

CONFIG=$@

for line in $CONFIG; do
  eval "$line"
done

# Define variables.
GH_API="https://api.github.com"
GH_REPO="$GH_API/repos/$owner/$repo"
GH_TAGS="$GH_REPO/releases/tags/$tag"
AUTH="Authorization: token $github_api_token"
WGET_ARGS="--content-disposition --auth-no-challenge --no-cookie"
CURL_ARGS="-LJO#"

if [[ "$tag" == 'LATEST' ]]; then
  GH_TAGS="$GH_REPO/releases/latest"
fi

# Validate token.
curl -o /dev/null -sH "$AUTH" $GH_REPO || {
  echo "Error: Invalid repo, token or network issue!"
  exit 1
}

# Read asset tags.
response=$(curl -sH "$AUTH" $GH_TAGS)

# Get ID of the asset based on given filename.
eval $(echo "$response" | grep -m 1 "id.:" | grep -w id | tr : = | tr -cd '[[:alnum:]]=')
[ "$id" ] || {
  echo "Error: Failed to get release id for tag: $tag"
  echo "$response" | awk 'length($0)<100' >&2
  exit 1
}

# Upload asset
echo -e "\n[*] Uploading asset... "

# Construct url
GH_ASSET="https://uploads.github.com/repos/$owner/$repo/releases/$id/assets?name=$(basename $filename)"

upload_response=$(curl -s --data-binary @"$filename" -H "Authorization: token $github_api_token" -H "Content-Type: application/octet-stream" $GH_ASSET)
echo "Upload response: $upload_response"

# Upload checksum of asset
echo -e "\n[*] Uploading checksum... "
checksum=$(sha256sum $filename | cut -d ' ' -f 1)
echo -n "$checksum" >"$filename.sha256"
GH_ASSET="https://uploads.github.com/repos/$owner/$repo/releases/$id/assets?name=$(basename $filename).sha256"
checksum_response=$(curl -s --data-binary @"$filename.sha256" -H "Authorization: token $github_api_token" -H "Content-Type: application/octet-stream" $GH_ASSET)
echo "Checksum upload response: $checksum_response"
