Update README.md (#12)

README.md

@@ -227,9 +227,40 @@ location /image_append {
 
 # server contex 中添加location
 
-#Donwload image use ngx.exec
-location /download_image2 {
-    content_by_lua_file /usr/local/openresty/nginx/conf/lua/download_image2.lua;
+#Donwload image use ngx.req.set_uri
+location /download_image {
+    rewrite_by_lua_block {
+        ngx.log(ngx.INFO , "location /download_image")
+
+        -- TODO: jwt decoder
+        -- 
+
+        -- Functions : String split
+        string.split = function(s, p)
+            local rt= {}
+            string.gsub(s, '[^'..p..']+', function(w) table.insert(rt, w) end )
+            return rt
+        end
+
+        -- Get url and split by '/' save into a table
+        local sub_url_table = string.split(ngx.var.uri, '/')
+        local sub_url_number = table.getn(sub_url_table)
+
+        for i = 1, sub_url_number do
+            ngx.log(ngx.INFO , "Sub url sub" .. i .. " : " .. sub_url_table[i])
+        end
+
+        local uri = "/internal_file_upload/"..sub_url_table[sub_url_number]..".jpg"
+        ngx.log(ngx.INFO , "uri : " .. uri)
+        return ngx.req.set_uri(uri , true)
+    }
+}
+
+#Static file server
+location /internal_file_upload {
+    internal;
+    try_files $uri /file_upload/8493acab-0f7a-47e0-8fff-e96b843334dd.jpg;
+
 }
 ```