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 { 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 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"] = os.getenv("SKYNET_PORTAL_API") ngx.header["Skynet-Server-Api"] = os.getenv("SKYNET_SERVER_API") -- 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 } 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;