update.sh

#!/usr/bin/env bash

# input variables
APP_ID="$1"
APP_NAME="$2"
CUR_TIME=$(date "+%Y-%m-%d %H:%M:%S")

# check for correct input
if [ "$APP_ID" == "" ] || [ "$APP_NAME" == "" ]
then
   echo "> Make sure you set the app id and name. Example:"
   echo "  $0 730 cs2"
   exit 1
fi
if [ "$GH_TOKEN" == "" ] || [ "$DISCORD_WEBHOOK" == "" ]
then
   echo "> Make sure you set GH_TOKEN and DISCORD_WEBHOOK environment variables"
   echo "> Use the Actions secrets when using this script in a GitHub workflow"
   exit 1
fi

echo "> Started processing information for app: \"$APP_NAME\""
echo "> Connecting to SteamCMD API to retrieve latest build id"

# retrieve steamcmd app info
CURL_URL="https://api.steamcmd.net/v1/info/$APP_ID"
CURL_TMP=$(mktemp)
CURL_OUT=$(curl --silent --output $CURL_TMP --write-out "%{http_code}" "$CURL_URL")

if [[ ${CURL_OUT} -lt 200 || ${CURL_OUT} -gt 299 ]]
then
   echo "> SteamCMD API returned the following error http code: \"$CURL_OUT\". Output:"
   echo "  $(cat $CURL_TMP)"
   echo "> Exiting script!"
   rm $CURL_TMP
   exit 1
else
   echo "> SteamCMD API returned the following http code: \"CURL_OUT\""
   BUILD_ID_NEW=$(cat $CURL_TMP | jq -r ".data.\"$APP_ID\".depots.branches.public.buildid")
   rm $CURL_TMP
fi

echo "> Retrieved latest build id: \"$BUILD_ID_NEW\""

if [ "$BUILD_ID_NEW" == "null" ]
then
   echo "> Build ID from API was \"null\". No further actions"
else

   # read current state file
   STATE_FILE="state/$APP_NAME.json"
   if [ -f "$STATE_FILE" ]
   then
      BUILD_ID_OLD=$(cat $STATE_FILE | jq -r '.build')
   fi

   # update state if changed
   if [ ! -f "$STATE_FILE" ] || [ "$BUILD_ID_NEW" != "$BUILD_ID_OLD" ]
   then
      echo "> Stored and retrieved build id differ ($BUILD_ID_OLD / $BUILD_ID_NEW)"

      # write state to json file
      jq --null-input \
      --arg id "$APP_ID" \
      --arg name "$APP_NAME" \
      --arg build "$BUILD_ID_NEW" \
      --arg updated "$CUR_TIME" \
      '{"id": $id, "name": $name, "build": $build ,"updated": $updated}' > $STATE_FILE
      echo "> Generating updated state file"

      # trigger build pipeline
      gh workflow run games.yml -f game=$APP_NAME --repo lanlords/games
      echo "> Triggered GitHub Actions workflow to rebuild game image"

      # send update to Discord
      DISCORD_CONTENT="The **$APP_NAME** build id has been updated from \`$BUILD_ID_OLD\` to \`$BUILD_ID_NEW\`. Triggered new [Docker Build](https://hub.docker.com/repository/registry-1.docker.io/lanlords/$APP_NAME/builds)."
      curl -s -H "Accept: application/json" -H "Content-Type:application/json" -X POST --data "{\"username\": \"GitHub Actions\", \"content\": \"$DISCORD_CONTENT\", \"avatar_url\": \"https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png\"}" $DISCORD_WEBHOOK

   else
      echo "> No difference in stored and retrieved build id. No further actions"
   fi
fi