# angular builds to index.html
index index.html;

# tor onion redirect
add_header Onion-Location http://$onion.onion$request_uri;

# HSTS preload enable
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";

# generate frame configuration from origin header
set $frameOptions "DENY";
set $contentSecurityPolicy "frame-ancestors 'none'";

# used for iframes on https://mempool.space/network
if ($http_referer ~ ^https://mempool.space/)
{
	set $frameOptions "ALLOW-FROM https://mempool.space";
	set $contentSecurityPolicy "frame-ancestors https://mempool.space";
}
# used for iframes on https://mempool.ninja/network
if ($http_referer ~ ^https://mempool.ninja/)
{
	set $frameOptions "ALLOW-FROM https://mempool.ninja";
	set $contentSecurityPolicy "frame-ancestors https://mempool.ninja";
}
# used for iframes on https://wiz.biz/bitcoin/nodes
if ($http_referer ~ ^https://wiz.biz/)
{
	set $frameOptions "ALLOW-FROM https://wiz.biz";
	set $contentSecurityPolicy "frame-ancestors https://wiz.biz";
}

# restrict usage of frames
add_header X-Frame-Options $frameOptions;
add_header Content-Security-Policy $contentSecurityPolicy;

# enable browser and proxy caching
add_header Cache-Control "public, no-transform";

# vary cache if user changes language preference
add_header Vary Accept-Language;
add_header Vary Cookie;

# fallback for all URLs i.e. /address/foo /tx/foo /block/000
location / {
	try_files /$lang/$uri /$lang/$uri/ $uri $uri/ /en-US/$uri @index-redirect;
	expires 10m;
}
location /resources {
	try_files /$lang/$uri /$lang/$uri/ $uri $uri/ /en-US/$uri @index-redirect;
	expires 1h;
}
location @index-redirect {
	rewrite (.*) /$lang/index.html;
}

# location block using regex are matched in order

# used to rewrite resources from /<lang>/ to /en-US/
       location ~ ^/(ar|bg|bs|ca|cs|da|de|et|el|es|eo|eu|fa|fr|gl|ko|hr|id|it|he|ka|lv|lt|hu|mk|ms|nl|ja|ka|no|nb|nn|pl|pt|pt-BR|ro|ru|sk|sl|sr|sh|fi|sv|th|tr|uk|vi|zh)/resources/ {
	rewrite ^/[a-zA-Z-]*/resources/(.*) /en-US/resources/$1;
}
# used for cookie override
       location ~ ^/(ar|bg|bs|ca|cs|da|de|et|el|es|eo|eu|fa|fr|gl|ko|hr|id|it|he|ka|lv|lt|hu|mk|ms|nl|ja|ka|no|nb|nn|pl|pt|pt-BR|ro|ru|sk|sl|sr|sh|fi|sv|th|tr|uk|vi|zh)/ {
	try_files $uri $uri/ /$1/index.html =404;
}