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How to redirect if user direct access to image files by browser?

Posted by Ryruji 
How to redirect if user direct access to image files by browser?
January 21, 2022 05:04AM
How do I redirect if a user tries to direct access image files in browser only? I want to still keep the ability to allow social media sites to embed our images by hotlinking. I just want only if a user direct access image by browser to redirect. This is my nginx conf:

proxy_cache_path /var/www/img.example.com/htdocs/cache-store levels=1:2 keys_zone=pixstore:10m max_size=5g inactive=7d use_temp_path=off;
server {

server_name img.example.com www.img.example.com;

access_log /var/log/nginx/img.example.com.access.log ;
error_log /var/log/nginx/img.example.com.error.log;

add_header X-Proxy-Cache $upstream_cache_status;
location / {
proxy_cache pixstore;
proxy_cache_revalidate on;
proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
proxy_cache_lock on;
add_header X-Cache-Status $upstream_cache_status;
proxy_pass http://xxx.xxx.xxx.xxx:8090;
proxy_redirect off;
include proxy_params;
proxy_cache_valid 200 7d;
proxy_cache_valid 404 5m;
}

location ~ "^/c/600x1200_90_webp/img-master/img/\d+/\d+/\d+/\d+/\d+/\d+/((?<filenum>\d+)[^/]+\.(jpg|png|webp))$" {
valid_referers server_names;
proxy_pass http://xxx.xxx.xxx.xxx:8090;
if ($invalid_referer = "0") {
return 301 http://view.example.com/artwork/$filenum; }
}
}

My redirect doesn't seem to be working. Anyone can fix it?
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