include /etc/nginx/conf.d/include/cors; include /etc/nginx/conf.d/include/proxy-buffer; include /etc/nginx/conf.d/include/proxy-cache-downloads; include /etc/nginx/conf.d/include/track-download; limit_conn downloads_by_ip 100; # ddos protection: max 100 downloads at a time #### ensure that skylink that we pass around is base64 encoded (transform base32 encoded ones) #### this is important because we want only one format in cache keys and logs ###set_by_lua_block $skylink { return require("skynet.skylink").parse(ngx.var.skylink) } ### ###$skylink_v1 and $skylink_v2 variables default to the same value but in case the requested skylink was: #### a) skylink v1 - it would not matter, no additional logic is executed #### b) skylink v2 - in a lua block below we will resolve the skylink v2 into skylink v1 and update #### $skylink_v1 variable so then the proxy request to skyd can be cached in nginx (proxy_cache_key #### in proxy-cache-downloads includes $skylink_v1 as a part of the cache key) set $skylink_v1 $skylink; set $skylink_v2 $skylink; ### #### variable for Skynet-Proof header that we need to inject #### into a response if the request was for skylink v2 ###set $skynet_proof ''; ### #### default download rate to unlimited ###set $limit_rate 0; ### ###access_by_lua_block { ### -- the block below only makes sense if we are using nginx cache ### if not ngx.var.skyd_disk_cache_enabled then ### local httpc = require("resty.http").new() ### ### -- detect whether requested skylink is v2 ### local isBase32v2 = string.len(ngx.var.skylink) == 55 and string.sub(ngx.var.skylink, 0, 2) == "04" ### local isBase64v2 = string.len(ngx.var.skylink) == 46 and string.sub(ngx.var.skylink, 0, 2) == "AQ" ### ### if isBase32v2 or isBase64v2 then ### -- 10.10.10.10 points to sia service (alias not available when using resty-http) ### local res, err = httpc:request_uri("http://10.10.10.10:9980/skynet/resolve/" .. ngx.var.skylink_v2, { ### headers = { ["User-Agent"] = "Sia-Agent" } ### }) ### ### -- print error and exit with 500 or exit with response if status is not 200 ### if err or (res and res.status ~= ngx.HTTP_OK) then ### ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status ### ngx.header["content-type"] = "text/plain" ### ngx.say(err or res.body) ### return ngx.exit(ngx.status) ### end ### ### local json = require('cjson') ### local resolve = json.decode(res.body) ### ngx.var.skylink_v1 = resolve.skylink ### ngx.var.skynet_proof = res.headers["Skynet-Proof"] ### end ### ### -- check if skylink v1 is present on blocklist (compare hashes) ### if require("skynet.blocklist").is_blocked(ngx.var.skylink_v1) then ### return require("skynet.blocklist").exit_illegal() ### end ### ### -- if skylink is found on nocache list then set internal nocache variable ### -- to tell nginx that it should not try and cache this file (too large) ### if ngx.shared.nocache:get(ngx.var.skylink_v1) then ### ngx.var.nocache = "1" ### end ### end ### ### if require("skynet.account").accounts_enabled() then ### -- check if portal is in authenticated only mode ### if require("skynet.account").is_access_unauthorized() then ### return require("skynet.account").exit_access_unauthorized() ### end ### ### -- check if portal is in subscription only mode ### if require("skynet.account").is_access_forbidden() then ### return require("skynet.account").exit_access_forbidden() ### end ### ### -- get account limits of currently authenticated user ### local limits = require("skynet.account").get_account_limits() ### ### -- apply download speed limit ### ngx.var.limit_rate = limits.download ### end ###} ### ###header_filter_by_lua_block { ### ngx.header["Skynet-Portal-Api"] = ngx.var.scheme .. "://" .. ngx.var.skynet_portal_domain ### ngx.header["Skynet-Server-Api"] = ngx.var.scheme .. "://" .. ngx.var.skynet_server_domain ### ### -- the block below only makes sense if we are using nginx cache ### if not ngx.var.skyd_disk_cache_enabled then ### -- not empty skynet_proof means this is a skylink v2 request ### -- so we should replace the Skynet-Proof header with the one ### -- we got from /skynet/resolve/ endpoint, otherwise we would ### -- be serving cached empty v1 skylink Skynet-Proof header ### if ngx.var.skynet_proof and ngx.var.skynet_proof ~= "" then ### ngx.header["Skynet-Proof"] = ngx.var.skynet_proof ### end ### ### -- add skylink to nocache list if it exceeds 1GB (1e+9 bytes) threshold ### -- (content length can be nil for already cached files - we can ignore them) ### if ngx.header["Content-Length"] and tonumber(ngx.header["Content-Length"]) > 1e+9 then ### ngx.shared.nocache:set(ngx.var.skylink_v1, ngx.header["Content-Length"]) ### end ### end ###} ### limit_rate_after 512k; limit_rate $limit_rate; proxy_read_timeout 600; proxy_set_header User-Agent: Sia-Agent; # in case the requested skylink was v2 and we already resolved it to skylink v1, we are going to pass resolved # skylink v1 to skyd to save that extra skylink v2 lookup in skyd but in turn, in case skyd returns a redirect # we need to rewrite the skylink v1 to skylink v2 in the location header with proxy_redirect ###proxy_redirect $skylink_v1 $skylink_v2; proxy_pass http://sia:9980/skynet/skylink/$skylink_v1$path$is_args$args;