#!/bin/sh
#
# usage: jldownload [<output-filename>] <url>
#

MIRROR_HOST=http://d304tytmzqn1fl.cloudfront.net

WGET=$(which wget 2>/dev/null)
CURL=$(which curl 2>/dev/null)
FETCH=$(which fetch 2>/dev/null)

TIMEOUT=15 # seconds
WGET_OPTS="--no-check-certificate --tries=1 --timeout=$TIMEOUT"
CURL_OPTS="-fkL --connect-timeout $TIMEOUT -y $TIMEOUT"
FETCH_OPTS="-T $TIMEOUT"

if [ $# -eq 1 ]; then
    CURL_OPTS="$CURL_OPTS -O"
    URL=$1
elif [ $# -eq 2 ]; then
    WGET_OPTS="$WGET_OPTS -O $1"
    CURL_OPTS="$CURL_OPTS -o $1"
    FETCH_OPTS="$FETCH_OPTS -o $1"
    URL=$2
else
    exit 1
fi

MIRROR_BASENAME=`basename $1`
MIRROR_URL="$MIRROR_HOST/$MIRROR_BASENAME"

if [ -x "$CURL" ] && $CURL -V >/dev/null; then
    GETURL="$CURL $CURL_OPTS"
elif [ -x "$WGET" ] && $WGET -V >/dev/null; then
    GETURL="$WGET $WGET_OPTS"
elif [ -x "$FETCH" ]; then
    GETURL="$FETCH $FETCH_OPTS"
else
    echo "Could not find working curl, wget, or fetch."
    echo "You need to install one of these to download dependencies."
    exit 1
fi

if [ -z "$JLDOWNLOAD_PREFER_MIRROR" ]; then
    $GETURL $URL || $GETURL $MIRROR_URL
else
    # Still try downloading from the original URL if the mirror fails.
    # User may want to get around a single failure, only to run into a dep
    # that we haven't mirrored yet, so better to be safe than sorry and try 
    # the original URL in that case
    $GETURL $MIRROR_URL || $GETURL $URL
fi
