last.fm to Slack

lastfm-to-slack.sh

#!/bin/bash
# this script updates your slack status with the current playing track from last.fm
# requires URI::Escape perl module (cpan URI::Escape) and jq
# make sure to update slack_api_key, last_fm_api_key, and last_fm_username

#########################################
##### to run this script at startup #####
#########################################

# save this script to /Users/<your_user>/Library/scripts/lastfm-to-slack.sh
# create a com.user.lastfmToSlack.plist file containing the following xml

# <?xml version="1.0" encoding="UTF-8"?>
# <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
# <plist version="1.0">
# <dict>
#    <key>Label</key>
#    <string>com.user.lastfmToSlack</string>
#    <key>ProgramArguments</key>
#    <array>
#      <string>/Users/<your_user>/Library/scripts/lastfm-to-slack.sh</string>
#    </array>
#    <key>RunAtLoad</key>
#    <true/>
# </dict>
# </plist>


# save the file in ~/Library/LaunchAgents
# run this command:  launchctl load ~/Library/LaunchAgents/com.user.lastfmToSlack.plist

#####################
##### variables #####
#####################
# slack api key
slack_api_key="xxxxxxxxxxxxxxx"
# last.fm api key
last_fm_api_key="xxxxxxxxxxxxxxx"
# last.fm username
last_fm_username="xxxxxxxxxxxxxxx"
# enable logging to file
debug="false"
# if debug is enabled, the following log file will be used
logfile="$(dirname "$0")/lastfm-to-slack.log"
# how often to check last.fm for a new track (in sec)
poll_for_new_song="10"
# emoji to use when playing (without surrounding colons)
playing_emoji="headphones"

############################
##### start the script #####
############################

# create a simple logging function
function log(){
  if [ $debug = true ]; then
    echo "$(date) $1" >> "$logfile"
  fi
}

# clear the log on startup
true > "$logfile"

# start the script in an infinite loop
while true
  do
    # reset update_slack var
    update_slack=""
    # set current time
    now=$(date +%s)

    # check to see if it's safe to update slack status (only update if no emoji or using our custom emoji)
    current_status_emoji=$(curl -C - -m 2 -s "https://slack.com/api/users.profile.get?token=$slack_api_key" | /usr/local/bin/jq -r .profile.status_emoji | sed 's/://g')
    log "current emoji: $current_status_emoji"

    if [[ "$current_status_emoji" == "" || "$current_status_emoji" == "$playing_emoji" ]]; then
      log "it's safe to update slack status. proceeding"
      update_slack="true"
    else
      log "it's not safe to update slack status"
    fi

    # if slack can be updated, go ahead and call lastfm and update it
    if [ $update_slack == "true" ]; then
      # get the raw json from last.fm
      raw_json=$(curl -s "https://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=$last_fm_username&api_key=$last_fm_api_key&format=json&limit=1&from=$now")
      log "raw json: $raw_json"

      # see if there's a valid response
      if ! echo "$raw_json" | /usr/local/bin/jq '.recenttracks.track.artist' >/dev/null 2>&1 ; then
        # nothing playing
        log "nothing playing."
        if [ "$now_playing" != "none" ]; then
          log "clearing slack status"
          # clear slack status
          curl -s -m 2 "https://slack.com/api/users.profile.set?token=$slack_api_key&profile=%7B%22status_text%22%3A%22""%22%2C%22status_emoji%22%3A%22%22%7D" > /dev/null
          encoded_track="none"
        else
          log "no need to update slack"
        fi
      else
        # get artist
        artist=$(echo "$raw_json" | /usr/local/bin/jq -r '.recenttracks.track.artist."#text"')
        # get album
        track=$(echo "$raw_json" | /usr/local/bin/jq -r '.recenttracks.track.name')
        # convert it to a url
        encoded_track=$(echo "$artist - $track" | perl -MURI::Escape -ne 'chomp;print uri_escape($_),"\n"')

        log "artist: $artist"
        log "track: $track"
        log "encoded_track: $encoded_track"

        # update slack status
        if [ "$now_playing" != "$encoded_track" ]; then
          if [[ "$track" != "" && "$track" != "null" ]]; then
            log "updating slack with new track info"
            curl -s -m 2 "https://slack.com/api/users.profile.set?token=$slack_api_key&profile=%7B%22status_text%22%3A%22$encoded_track%22%2C%22status_emoji%22%3A%22%3A$playing_emoji%3A%22%7D"  > /dev/null
          fi
        else
          log "the same song is playing from the last check. not updating slack"
        fi
      fi
    fi
  # set now playing to current song
  now_playing="$encoded_track"
  # sleep
  log "sleeping for $poll_for_new_song seconds"
  sleep $poll_for_new_song
done