103 lines
4.5 KiB
Plaintext
103 lines
4.5 KiB
Plaintext
include /etc/nginx/conf.d/include/cors;
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include /etc/nginx/conf.d/include/proxy-buffer;
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include /etc/nginx/conf.d/include/proxy-cache-downloads;
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include /etc/nginx/conf.d/include/track-download;
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# redirect purge calls to separate location
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error_page 462 = @purge;
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if ($request_method = PURGE) {
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return 462;
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}
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limit_conn downloads_by_ip 100; # ddos protection: max 100 downloads at a time
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# ensure that skylink that we pass around is base64 encoded (transform base32 encoded ones)
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# this is important because we want only one format in cache keys and logs
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set_by_lua_block $skylink { return require("skynet.skylink").parse(ngx.var.skylink) }
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# $skylink_v1 and $skylink_v2 variables default to the same value but in case the requested skylink was:
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# a) skylink v1 - it would not matter, no additional logic is executed
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# b) skylink v2 - in a lua block below we will resolve the skylink v2 into skylink v1 and update
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# $skylink_v1 variable so then the proxy request to skyd can be cached in nginx (proxy_cache_key
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# in proxy-cache-downloads includes $skylink_v1 as a part of the cache key)
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set $skylink_v1 $skylink;
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set $skylink_v2 $skylink;
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# variable for Skynet-Proof header that we need to inject
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# into a response if the request was for skylink v2
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set $skynet_proof '';
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# default download rate to unlimited
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set $limit_rate 0;
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access_by_lua_block {
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local httpc = require("resty.http").new()
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-- detect whether requested skylink is v2
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local isBase32v2 = string.len(ngx.var.skylink) == 55 and string.sub(ngx.var.skylink, 0, 2) == "04"
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local isBase64v2 = string.len(ngx.var.skylink) == 46 and string.sub(ngx.var.skylink, 0, 2) == "AQ"
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if isBase32v2 or isBase64v2 then
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-- 10.10.10.10 points to sia service (alias not available when using resty-http)
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local res, err = httpc:request_uri("http://10.10.10.10:9980/skynet/resolve/" .. ngx.var.skylink_v2, {
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headers = { ["User-Agent"] = "Sia-Agent" }
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})
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-- print error and exit with 500 or exit with response if status is not 200
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if err or (res and res.status ~= ngx.HTTP_OK) then
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ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status
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ngx.header["content-type"] = "text/plain"
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ngx.say(err or res.body)
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return ngx.exit(ngx.status)
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end
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local json = require('cjson')
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local resolve = json.decode(res.body)
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ngx.var.skylink_v1 = resolve.skylink
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ngx.var.skynet_proof = res.headers["Skynet-Proof"]
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end
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-- this block runs only when accounts are enabled
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if os.getenv("ACCOUNTS_ENABLED") ~= "true" then return end
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-- 10.10.10.70 points to accounts service (alias not available when using resty-http)
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local res, err = httpc:request_uri("http://10.10.10.70:3000/user/limits", {
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headers = { ["Cookie"] = "skynet-jwt=" .. ngx.var.skynet_jwt }
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})
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-- fail gracefully in case /user/limits failed
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if err or (res and res.status ~= ngx.HTTP_OK) then
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ngx.log(ngx.ERR, "Failed accounts service request /user/limits: ", err or ("[HTTP " .. res.status .. "] " .. res.body))
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ngx.var.limit_rate = 2621440 -- (20 * 1024 * 1024 / 8) conservative fallback to 20 mbps in case accounts failed to return limits
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elseif res and res.status == ngx.HTTP_OK then
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local json = require('cjson')
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local limits = json.decode(res.body)
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ngx.var.limit_rate = limits.download
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end
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}
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header_filter_by_lua_block {
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ngx.header["Skynet-Portal-Api"] = os.getenv("SKYNET_PORTAL_API")
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ngx.header["Skynet-Server-Api"] = os.getenv("SKYNET_SERVER_API")
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-- not empty skynet_proof means this is a skylink v2 request
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-- so we should replace the Skynet-Proof header with the one
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-- we got from /skynet/resolve/ endpoint, otherwise we would
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-- be serving cached empty v1 skylink Skynet-Proof header
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if ngx.var.skynet_proof and ngx.var.skynet_proof ~= "" then
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ngx.header["Skynet-Proof"] = ngx.var.skynet_proof
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end
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}
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limit_rate_after 512k;
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limit_rate $limit_rate;
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proxy_read_timeout 600;
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proxy_set_header User-Agent: Sia-Agent;
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# in case the requested skylink was v2 and we already resolved it to skylink v1, we are going to pass resolved
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# skylink v1 to skyd to save that extra skylink v2 lookup in skyd but in turn, in case skyd returns a redirect
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# we need to rewrite the skylink v1 to skylink v2 in the location header with proxy_redirect
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proxy_redirect $skylink_v1 $skylink_v2;
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proxy_pass http://sia:9980/skynet/skylink/$skylink_v1$path$is_args$args;
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