#!/bin/sh
#
# Copyright (c) 2006 Volker Uhrig and Benjamin Schweizer. All rights reserved.
#
# Abstract
# ~~~~~~~~
# Downloads videos from Google Video and YouTube in FLV format, using the web
# services at videodl.org and videodownloader.net.
#
# Authors
# ~~~~~~~
# Benjamin Schweizer <code at benjamin-schweizer dot de>
# Volker Uhrig <volker at uhrig dot eu dot org>
#
# Changes
# ~~~~~~~
# 2006-10-19, schweizer: added google video support, added fallback, fixed argv2
# 2006-06-19, schweizer: added syntax checks and replaced wget+lynx with curl
# 2006-05-21, volker: initial release
#
# Todo
# ~~~~
# - nothing
#

function usage() {
	cat <<HEREDOC
Copyright (c) 2006 Volker Uhrig and Benjamin Schweizer. All rights reserved.


usage:

	${0} <uri> [<filename>]

	uri:		video uri, like 
			http://youtube.com/watch?v=wizKUrUgFOw or
			http://video.google.com/videoplay?docid=3336384089449952745
	filename:	optional local filename


HEREDOC
}

function get_data_uri() {
	WATCH_URI="${1}"

	#http://videodownloader.net/get/?url=http://youtube.com/watch?v=m7dnGo_2tZA
	echo -n "Searching for data uri (videodownloader.net) ... "
	DATA_URI=`curl --silent "http://videodownloader.net/get/?url=$1" -o - | \
		grep -isE "a href=\"http://youtube.com|a href=\"http://vp.video.google.com" | \
		sed "s/\&amp;/\&/g" | \
		sed "s/\"><img src.*$//" | \
		sed "s/^.*a href=\"//"`

	STATUS=$?
	if [ ${STATUS} ] && [ "${DATA_URI}" ]; then
		echo "done."
		return 0
	fi
	echo "failed."

	#http://www.videodl.org/main/search?searchinput=http://youtube.com/watch?v=m7dnGo_2tZA
	echo -n "Searching for data uri (videodl.org) ... "
	# flv
	DATA_URI=`curl --silent "http://www.videodl.org/main/search?searchinput=$1" -o - | \
		grep -isE "a href=\"http://youtube.com|a href=\"http://vp.video.google.com" | \
		sed "s/^.*<a href=\"//" | \
		sed "s/\">download link.*$//"`

	STATUS=$?
	if [ ${STATUS} ] && [ "${DATA_URI}" ]; then
		echo "done."
		return 0
	fi
	echo "failed."

	echo "no resolvers left. giving up."
	return 1
}

WATCH_URI="${1}"
if [ $# -eq 1 ]; then
	FILENAME="-O"
fi
if [ $# -eq 2 ]; then
	FILENAME="-o$2"
fi
if [ "${FILENAME}" = "" ]; then
	usage
	exit 1
fi

get_data_uri "${WATCH_URI}" || exit 1
#echo $DATA_URI

echo -n "Downloading data ... "
curl --silent --location "${DATA_URI}" "${FILENAME}"
STATUS=$?
if [ ! ${STATUS} ]; then
	echo "failed."
	exit 1
fi
echo "done."

# eof.