Windows spotlight wallpaper changer for Linux (Elementary OS) and macOS

windows-spotlight-wp.sh

#!/usr/bin/env bash

# Elementary OS specific:
# 1) edit file "/etc/lightdm/io.elementary.greeter.conf"
# uncomment line 3 "#default-wallpaper=/usr/share/backgrounds/elementaryos-default"
# 2) change symbolic link "/usr/share/backgrounds/elementaryos-default" to "~/windows-spotlight-wp/last.jpg"

function checkret
{
	if [ $1 -ne 0 ]; then
		echo $2
		exit $1
	fi
}

function set_wp_linux
{
        path="$1"
        title="$2"
        copyright="$3"

        PID=$(pgrep gnome-session)
        export DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$PID/environ | tr -d '\000' | cut -d= -f2-)

        gsettings set "org.gnome.desktop.background" picture-options "zoom"
        gsettings set "org.gnome.desktop.background" picture-uri "file://$path"

        # Elementary OS remove current greeter wallpaper
        user=$(whoami)
        rm -f /var/lib/lightdm-data/$user/wallpaper/*

        if [ ! -z "$title" ]; then
		notify-send "New wallpaper" "$title\n$copyright" --icon=preferences-desktop-wallpaper --urgency=low
	fi
}

function set_wp_mac
{
        path="$1"
        title="$2"
        copyright="$3"

        osascript -e 'tell application "Finder" to set desktop picture to POSIX file "$path"'

	if [ ! -z "$title" ]; then
	        osascript -e 'display notification "$copyright" with title "New wallpaper" subtitle "$title"'
	fi
}

JQ=$(which jq)
checkret $? "jq not found, please install it with 'apt install jq' for Linux or 'brew install jq' for macOS"

echo -n $(date +%Y-%m-%d\ %H:%M:%S)" "

DIR=~/windows-spotlight-wp
URL="https://arc.msn.com/v3/Delivery/Cache?pid=279978&fmt=json&ua=WindowsShellClient&lc=en,en-US&ctry=US"

json=$(curl -f -s $URL)
checkret $? "Failed to load JSON"

item=$(jq -r ".batchrsp.items[0].item" <<< $json)
checkret $? "Failed to parse item"

landscapeUrl=$(jq -r ".ad.image_fullscreen_001_landscape.u" <<< $item)
sha256=$(jq -r ".ad.image_fullscreen_001_landscape.sha256" <<< $item | base64 -d | hexdump -ve "1/1 \"%.2x\"")
title=$(jq -r ".ad.title_text.tx" <<< $item)
copyright=$(jq -r ".ad.copyright_text.tx" <<< $item)

path="$DIR/$sha256.jpg"
if [ -f $path ]; then
	title=""
	copyright=""
	echo "File already exists!"
else
	mkdir -p $DIR
	curl -s -f "$landscapeUrl" --output "$path"
	checkret $? "Failed to download wallpaper"
	echo "New wallpaper file"
fi
ln -sf $path $DIR/last.jpg

uname=$(uname -s)
case "$uname" in
	Darwin)
		set_wp_mac "$path" "$title" "$copyright"
	;;
	Linux)
		set_wp_linux "$path" "$title" "$copyright"
	;;
	*)
		echo "Unknown OS '$uname'"
		exit 1
	;;
esac

echo $path