rewrite htaccess to https with route - php

Question

Im using the following .htaccess for my website. I redirect all urls to index.php if their isn't a file located at the url.
Options +FollowSymLinks
IndexIgnore */*
# Turn on the RewriteEngine
RewriteEngine On
# Rules
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php
This way http://website.com/user/user_name/ goes to index.php
and
http://website.com/css/style.css gives the actual css file (if style.css exists).
This works great, only i want to force https:// on the urls and i can't manage to get it to work. Any help is greatly appreciated.
Edit:
Using Jeroen's answer I got it working with the following .htaccess
Options +FollowSymLinks
IndexIgnore */*
# Turn on the RewriteEngine
RewriteEngine On
# Rules
RewriteCond %{HTTP:CF-Visitor} '"scheme":"http"'
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L,QSA]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php

Answer 1

As you are using CloudFlare's ssl - I assume Flexible SSL - you need a different solution although #Fox's solution is correct for a "normal" ssl connection.
For CloudFlare you need something like:
RewriteCond %{HTTP:CF-Visitor} '"scheme":"http"'
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L,QSA]
Also see CloudFlare's support article.

Answer 2

Try this
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
</IfModule>