Hack:mcf

From Music Player Daemon Community Wiki

Here is a nice shell script that will allow a last.fm user to easily play the last.fm streams within mpd using mpc to pass the correct url.

See http://bash.madskas.net/#mc for additional details, and the latest version.

• mcf - last.fm radio

mcf gives you easy MPD access to last.fm radio stations. Whether you want a user's personal station, an artist centered station or stations based on last.fm's tags, it's only a command away. It currently is configured for stations relating to similar artists (to the artist searched for), global tags, and groups as well as a user's personal and neighbourhood stations. Need music for a date? Try 'mcf f smooth soul' or go straight to the source with 'mcf a marvin gaye'. See the code. Thanks to Pianosaurus from last.fm for contributions (read: re-write :) in version 0.3

#! /bin/bash
# mclastfm - part of the mpc controller series
# based on a fix by ghacks.net (http://www.ghacks.net/2007/09/22/play-lastfm-radio-streams-in-your-music-player/)
# Copyright 2008 (c)
#  Maintainer:         chochem:     Mads Michelsen <chochem@gmail.com>
#  Santas li'l helper: pianosaurus: Ole Christian Tvedt <olechrt@stud.ntnu.no>

VERSION="0.3"

# New in 0.3
# + play specific lastfm:// address
# + calculate md5sum in configuration
# + a few bugfixes
#
# New in 0.2
# + separate configuration file
# + group tag
# + popular tags menu
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


###############################################################################
# Print $1, and wrap it to fit terminal width if fmt is available.
###############################################################################
output () {
  if which fmt &> /dev/null; then
    echo "$1" | fmt -s -w "$(tput cols)"
  else
    printf "$1"
  fi
}

###############################################################################
# Output help and usage information.
###############################################################################
printhelp () {
  U1="$(tput smul)"
  U0="$(tput rmul)"
  output "$(basename "$0") $VERSION gives you easy MPD access to last.fm radio stations.
Run '$(basename "$0") --setup' to generate a configuration file before use.

Syntax:
  $(basename "$0") ${U1}<search key>${U0} ${U1}<search term(s)>${U0}

Search keys can be
  ${U1}a${U0} for artist (e.g. 'new york dolls')
  ${U1}f${U0} for last.fm's global tags, only one accepted (e.g. 'funky')
  ${U1}l${U0} to pick a tag from a list of poular tags (does not require search terms)
  ${U1}r${U0} for a group's radio station (e.g 'mpd')
  ${U1}u${U0} for user's radio station (e.g. 'musiclover8462')
  ${U1}n${U0} for user's neighbourhood radio station (e.g. 'musiclover8462')
  ${U1}s${U0} for a specific last.fm address (e.g. 'lastfm://play/tracks/10413')

Last.fm is fairly strict with redirects but you should be able to get away with omitting initial 'the's and not capitalizing any letters. All search terms except user name and lasf.fm address can consist of multiple words. Sadly there does not seem to be a way to combine multiple tags." 1>&2
}

###############################################################################
# Create a configuration file containing the user's last.fm username and
# password hash. Delete the old file if it exists.
###############################################################################
setupConfFile () {
  output "Configuring $(basename "$0"). This will produce a configuration file (.mcf) in your home directory.
" 1>&2

  USERNAME=""
  PASSWORD=""
  MDFIVE=""

  while [ -z "${USERNAME}" ]; do
    read -ep "What is your last.fm username? " USERNAME
  done

  if which md5sum &> /dev/null; then
    while [ -z "${PASSWORD}" ]; do
      read -sp "What is your last.fm password? " PASSWORD
    done
    echo
    MDFIVE=$(echo -n ${PASSWORD} | md5sum | cut -f1 -d' ')
  else
    output "You don't have md5sum in your path. Either install it or use http://md5.rednoize.com/ or a similar site." 1>&2
    while [ -z "${MDFIVE}" ]; do
      read -ep "What is the md5 hash of your last.fm password? " MDFIVE
    done
  fi

  echo "USERNAME=${USERNAME}" > ~/.mcf
  echo "MDFIVE=${MDFIVE}" >> ~/.mcf
}

###############################################################################
# Exit with an error message and status 1.
###############################################################################
quitter () {
  output "Connection unsuccessful. Please check your network and your configuration file." 1>&2
  exit 1
}

###############################################################################
# Download a list of popular tags and ask the user what to listen to.
###############################################################################
poptag () {
  COLUMNS="$(tput cols)"
  output "Fetching tags from http://www.last.fm/music/+tags/..."
  TAGS="$(wget -q -O - http://www.last.fm/music/+tags/ | sed -ne 's|^.*"/tag/\([^"]*\).*$|\1|p')"
  ORIGINAL_IFS=$IFS
  IFS=$'\n'
  select TAG in $TAGS; do
    SEARCHTERMS="$(echo "$TAG" | tr ' ' '+')"
    break
  done
  IFS=$ORIGINAL_IFS
}

###############################################################################
# Decode last.fm urls to SEARCH and SEARCHTERMS format.
# Urls do not need to be prefixed with lastfm://
###############################################################################
decodeUrl () {
  # Decompose to lastfm://SEARCH/SEARCHTERMS
  SEARCH="$(echo "$SEARCHTERMS" | sed -ne 's|^\(lastfm\)\?:\?/*\([^/]*\).*$|\2|p')"
  SEARCHTERMS="$(echo "$SEARCHTERMS" | sed -ne "s|^\(lastfm\)\?:\?/*${SEARCH}/*\(.*\)$|\2|p")"

  # Make sure none of them are zero length by now.
  if [ -z "$SEARCH" ] || [ -z "$SEARCHTERMS" ]; then
    output "Invalid last.fm address!" 1>&2
    exit 1
  fi
}

###############################################################################
# Non-function code begins here.
###############################################################################

# Help the clueless
if [ -z "$*" -o "$*" = "-h" -o "$*" = "--help" ]; then 
  printhelp
  exit
elif [ "$*" = "--setup" ]; then
  setupConfFile
  exit
elif [ "$*" = "-v" -o "$*" = "--version" ]; then
  echo "$(basename "$0") $VERSION"
  exit
fi

# Check for configuration file
if [ -f ~/.mcf ]; then
  source ~/.mcf
else
  setupConfFile
fi

# Get search terms
SEARCHKEY="$1"
shift
SEARCHTERMS="$(echo "$*" | tr ' ' '+')"
case "$SEARCHKEY" in
  a) SEARCH="artist";     SEARCH2="";;
  f) SEARCH="globaltags"; SEARCH2="";;
  l) SEARCH="globaltags"; SEARCH2="";poptag;;
  r) SEARCH="group";      SEARCH2="";;
  u) SEARCH="user";       SEARCH2="/personal";;
  n) SEARCH="user";       SEARCH2="/neighbours";;
  s) decodeUrl;;
  *) U1="$(tput smul)"; U0="$(tput rmul)"; output "'$SEARCHKEY' is not a valid keyword - only ${U1}a${U0}, ${U1}f${U0}, ${U1}l${U0}, ${U1}n${U0}, ${U1}r${U0} and ${U1}u${U0} are acceptable.
Please see $(basename \"$0\") --help for reference and try again." 1>&2 && exit 1;;
esac

# getting sessioninfo from last.fm
BROWSERID="Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.13) Gecko/20080325 Ubuntu/7.10 (gutsy) Firefox/2.0.0.13"
LASTURL="http://ws.audioscrobbler.com/radio/handshake.php?version=1.1.1&platform=linux&username=${USERNAME}&passwordmd5=${MDFIVE}&debug=0&partner="
output "Setting up a session with last.fm..."
HANDSHAKE="$(wget -q -t 1 -T 15 -U "$BROWSERID" "$LASTURL" -O - || quitter)"
STREAMURL="$(echo "$HANDSHAKE" | grep ^stream_url | cut -d = -f 2-)"
SESSION="$(echo "$HANDSHAKE" | grep ^session | cut -d = -f 2)"

# sending request to last.fm
REQURL="http://ws.audioscrobbler.com/radio/adjust.php?session=${SESSION}&url=lastfm://${SEARCH}/${SEARCHTERMS}${SEARCH2}&debug=0"
output "Requesting stream from last.fm..."
REQUEST="$(wget -q -t 1 -T 15 -U "$BROWSERID" "$REQURL" -O - || quitter)"

# evaluate last.fm reply & fire up mpc
if echo "$REQUEST" | grep "response=OK" &> /dev/null; then
  STATION="$(echo "$REQUEST" | grep '^stationname' | cut -d = -f 2- | tr -d ’)"
  echo "Station found: $STATION"
  mpc clear
  echo "$STREAMURL" | mpc add &> /dev/null
  mpc play &> /dev/null
else 
  echo "No joy. Please check your search terms." 1>&2
fi