detect www. using sed - amazon-web-services

Question

I am new to sed and almost confused.
Here is what I have in the nginx folder of my project:
files:
"/tmp/45_nginx_https_rw.sh":
owner: root
group: root
mode: "000644"
content: |
#! /bin/bash
CONFIGURED=`grep -c "return 301 https" /etc/nginx/conf.d/00_elastic_beanstalk_proxy.conf`
if [ $CONFIGURED = 0 ]
then
sed -i '/listen 8080;/a \ if ($http_x_forwarded_proto = "http") { return 301 https://$host$request_uri; }\n' /etc/nginx/conf.d/00_elastic_beanstalk_proxy.conf
logger -t nginx_rw "https rewrite rules added"
exit 0
else
logger -t nginx_rw "https rewrite rules already set"
exit 0
fi
The above code works like a charm and basically redirects all the request to https if they are http request.
However I need to add a piece to check if the url has www and redirect to non www.
so for example www.test.com will be redirected to test.com.
How can I achieve this?

Answer 1

The AWS recommended solution was to completely rewrite "/etc/nginx/sites-available/elasticbeanstalk-nginx-docker-proxy.conf"
You can do this by adding this file in .ebextensions: https://github.com/awsdocs/elastic-beanstalk-samples/blob/master/configuration-files/aws-provided/security-configuration/https-redirect/docker-sc/https-redirect-docker-sc.config
I made one extra tweak for www redirect:
location / {
set $redirect 0;
if ($http_x_forwarded_proto != "https") {
set $redirect 1;
}
if ($host ~ ^www\.(?<domain>.+)$) {
set $redirect 1;
}
if ($http_user_agent ~* "ELB-HealthChecker") {
set $redirect 0;
}
if ($redirect = 1) {
return 301 https://ADDYOURDOMAINREDIRECTHERE$request_uri;
}
*One more note, your ec2 instance may already have a bunch of config files that you tried while finding a solution. I suggest deploying your app with NO config in .ebextensions, and then Rebuild Environment from the ELB console. This should give you a blank slate. Then simply add the file above to .ebextensions and redeploy.
*another note, you can ssh into your ec2 instance and verify that the file looks correct