simplify dnslink logic

nginx/conf.d/server/server.dnslink

@@ -2,57 +2,37 @@ include /etc/nginx/conf.d/include/init-optional-variables;
 
 location / {
     set $skylink "";
-    set $path $uri;
+    set $path "";
 
     rewrite_by_lua_block {
+        local basexx = require("basexx")
         local cjson = require("cjson")
-        local cache = ngx.shared.dnslink
-        local cache_value = cache:get(ngx.var.host)
+        local httpc = require("resty.http").new()
+
+        -- 10.10.10.55 points to dnslink-api service (alias not available when using resty-http)
+        local res, err = httpc:request_uri(
+            "http://10.10.10.55:3100/dnslink/" .. ngx.var.host .. "/" .. basexx.to_base64(ngx.var.uri)
+        )
 
-        if cache_value == nil then
-            local httpc = require("resty.http").new()
-
-            -- 10.10.10.55 points to dnslink-api service (alias not available when using resty-http)
-            local res, err = httpc:request_uri("http://10.10.10.55:3100/dnslink/" .. ngx.var.host)
-
-            if err or (res and res.status ~= ngx.HTTP_OK) then
-                -- check whether we can fallback to regular skylink request
-                local match_skylink = ngx.re.match(ngx.var.uri, "^/([a-zA-Z0-9-_]{46}|[a-z0-9]{55})(/.*)?")
-
-                if match_skylink then
-                    ngx.var.skylink = match_skylink[1]
-                    ngx.var.path = match_skylink[2] or "/"
-                else
-                    ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status
-                    -- do not send response on unauthorized error (status code 401)
-                    -- otherwise we will not be able to display custom error page
-                    if ngx.status ~= ngx.HTTP_UNAUTHORIZED then
-                        ngx.header["content-type"] = "text/plain"
-                        ngx.say(err or res.body)
-                    end
-                    ngx.exit(ngx.status)
-                end
-            else
-                local resolved = cjson.decode(res.body)
-
-                ngx.var.skylink = resolved.skylink
-                if resolved.sponsor then
-                    ngx.req.set_header("Skynet-Api-Key", resolved.sponsor)
-                end
-
-                local cache_ttl = 300 -- 5 minutes cache expire time
-                cache:set(ngx.var.host, res.body, cache_ttl)
-            end
-        else
-            local resolved = cjson.decode(cache_value)
+        if res and res.status == ngx.HTTP_OK then
+            local resolved = cjson.decode(res.body)
 
             ngx.var.skylink = resolved.skylink
+            ngx.var.path = resolved.path
+
             if resolved.sponsor then
                 ngx.req.set_header("Skynet-Api-Key", resolved.sponsor)
             end
+        else
+            ngx.status = (err and ngx.HTTP_INTERNAL_SERVER_ERROR) or res.status
+            -- do not send response on unauthorized error (status code 401)
+            -- otherwise we will not be able to display custom error page
+            if ngx.status ~= ngx.HTTP_UNAUTHORIZED then
+                ngx.header["content-type"] = "text/plain"
+                ngx.say(err or res.body)
+            end
+            ngx.exit(ngx.status)
         end
-
-        ngx.var.skylink = require("skynet.skylink").parse(ngx.var.skylink)
     }
 
     include /etc/nginx/conf.d/include/location-skylink;