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-#+title: Redirect Nginx Subdomains & Trailing Content with Regex
-#+date:  2022-12-07
-
-** Problem
-:PROPERTIES:
-:CUSTOM_ID: problem
-:END:
-I recently migrated domains and replaced the old webpage with a simple
-info page with instructions to users on how to edit their bookmarks and
-URLs to get to the page they were seeking.
-
-This was not ideal as it left the work up to the user and may have
-caused friction for users who accessed my RSS feed.
-
-** Solution
-:PROPERTIES:
-:CUSTOM_ID: solution
-:END:
-Instead, I finally found a solution that allows me to redirect both
-subdomains AND trailing content. For example, both of these URLs now
-redirect properly using the logic I'll explain below:
-
-#+begin_src txt
-# Example 1 - Simple base domain redirect with trailing content
-https://domain1.com/blog/alpine-linux/ -> https://domain2.com/blog/alpine-linux/
-
-# Example 2 - Complex redirect with both a subdomain and trailing content
-https://libreddit.domain1.com/r/history/comments/7z8cbg/new_discovery_mode_turns_video_game_assassins/
-->
-https://libreddit.domain2.com/r/history/comments/7z8cbg/new_discovery_mode_turns_video_game_assassins/
-#+end_src
-
-Go ahead, try the URLs if you want to test them.
-
-*** Nginx Config
-:PROPERTIES:
-:CUSTOM_ID: nginx-config
-:END:
-To make this possible. I needed to configure a proper redirect scheme in
-my Nginx configuration.
-
-#+begin_src sh
-doas nano /etc/nginx/http.d/domain1.conf
-#+end_src
-
-Within this file, I had one block configured to redirect HTTP requests
-to HTTPS for the base domain and all subdomains.
-
-#+begin_src conf
-server {
-        listen [::]:80;
-        listen 80;
-        server_name domain1.com *.domain1.com;
-
-        if ($host = domain1.com) {
-                return 301 https://$host$request_uri;
-        }
-
-        if ($host = *.domain1.com) {
-                return 301 https://$host$request_uri;
-        }
-
-        return 404;
-}
-#+end_src
-
-For the base domain, I have another =server= block dedicated to
-redirecting all base domain requests. You can see that the =rewrite=
-line is instructing Nginx to gather all trailing content and append it
-to the new =domain2.com= URL.
-
-#+begin_src conf
-server {
-        listen [::]:443 ssl http2;
-        listen 443 ssl http2;
-
-        server_name domain1.com;
-
-        rewrite ^/(.*)$ https://domain2.com/$1 permanent;
-
-        ssl_certificate     /etc/letsencrypt/live/domain1.com/fullchain.pem;
-        ssl_certificate_key /etc/letsencrypt/live/domain1.com/privkey.pem;
-}
-#+end_src
-
-Finally, the tricky part is figuring out how to tell Nginx to redirect
-while keeping both a subdomain and trailing content intact. I found that
-the easiest way to do this is to give it a =server= block of its own.
-
-Within this block, we need to do some regex on the =server_name= line
-before we can rewrite anything. This creates a variable called
-=subdomain=.
-
-Once the server gets to the =rewrite= line, it pulls the =subdomain=
-variable from above and uses it on the new =domain2.com= domain before
-appending the trailing content (=$request_uri=).
-
-#+begin_src conf
-server {
-        listen [::]:443 ssl http2;
-        listen 443 ssl http2;
-
-        server_name ~^(?<subdomain>\w+)\.domain1\.com$;
-
-        rewrite ^ https://$subdomain.domain2.com$request_uri permanent;
-
-        ssl_certificate     /etc/letsencrypt/live/domain1.com/fullchain.pem;
-        ssl_certificate_key /etc/letsencrypt/live/domain1.com/privkey.pem;
-}
-#+end_src
-
-That's all there is to it. With this, I simply restarted Nginx and
-watched the redirections work in-action.
-
-#+begin_src sh
-doas rc-service nginx restart
-#+end_src
-
-Looking back on it, I wish I had done this sooner. Who knows how many
-people went looking for my sites or bookmarks and gave up when they saw
-the redirect instructions page.
-
-Oh well, it's done now. Live and learn.