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README.md

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+# Microsoft Spotlight for GNU/Linux distros
+Just set your display manager's login greeter's background to use the image set in this script's WALLPAPER variable (or vice versa) and put the script in the startup :)
+
+E.g.: For lightdm you would have to edit /etc/lightdm/lightdm-gtk-greeter.conf to use /opt/login-background.jpg
+
+## About the MS Spotlight API
+
+The Spotlight API is located on the following endpoint:
+
+`https://arc.msn.com/v3/Delivery/Cache?pid=209567&fmt=json&rafb=0&ua=WindowsShellClient%2F0&disphorzres=9999&dispvertres=9999&lo=80217&pl=en-US&lc=en-US&ctry=us&time=2017-12-31T23:59:59Z`
+
+Where the expected arguments are:
+ - `pid` : Purpose currently unknown
+ - `fmt` : Output format, e.g. `json`
+ - `rafb` : Purpose currently unknown
+ - `ua` : Client user agent string
+ - `disphorzres`: Screen width in pixels
+ - `dispvertres`: Screen height in pixels
+ - `lo` : Purpose currently uknown
+ - `pl` : Locale, e.g. `en-US`
+ - `lc` : Language, e.g. `en-US`
+ - `ctry` : Country, e.g. `us`
+ - `time` : Time, e.g. `2017-12-31T23:59:59Z`
+
+The JSON response contains details about 6-7 images including image url, title, sha256, ads, etc.
+
+Spotlight API URL was originally found in this [file](https://github.com/KoalaBR/spotlight/blob/3164a43684dcadb751ce9a38db59f29453acf2fe/spotlightprovider.cpp#L17), thanks to the author for their findings!

spotlight.sh

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+#!/bin/sh
+
+#
+# spotlight.sh
+#
+# Diogo Cordeiro
+# www.diogo.site
+#
+
+sleep 5
+ping -q -c 1 -W 1 8.8.8.8 >/dev/null || exit
+
+WALLPAPER="/opt/login-background.jpg"
+API="https://arc.msn.com/v3/Delivery/Cache?pid=209567&fmt=json&rafb=0&ua=WindowsShellClient%2F0&disphorzres=9999&dispvertres=9999&lo=80217&pl=en-US&lc=en-US&ctry=us&time="
+TIME=$( date '+%Y-%m-%dT%H:%M:%SZ' )
+
+while [ ! -s "$WALLPAPER.new" ]
+do
+        REQUEST_RESULT=$( curl --silent "$API$TIME" -H 'Host: arc.msn.com' -H 'Connection: keep-alive' -H 'Cache-Control: max-age=0' )
+        for j in `grep -Eo "landscape.{56}https:.{51}binary.{9}" <<< $REQUEST_RESULT | grep -Eo "https:.{51}binary.{9}"`
+        do
+                j=$( sed "s@\\\\@@g" <<< $j )
+                curl --silent $j > "$WALLPAPER.new"
+        done
+done
+
+mv "$WALLPAPER.new" "$WALLPAPER"