feat(apisix): add Cloudron package

- Implements Apache APISIX packaging for Cloudron platform.
- Includes Dockerfile, CloudronManifest.json, and start.sh.
- Configured to use Cloudron's etcd addon.

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>

CloudronPackages/APISIX/apisix-source/apisix/plugins/proxy-cache/util.lua

@@ -0,0 +1,102 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to You under the Apache License, Version 2.0
+-- (the "License"); you may not use this file except in compliance with
+-- the License.  You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+
+local core = require("apisix.core")
+local ngx_re = require("ngx.re")
+local tab_concat = table.concat
+local string = string
+local io_open = io.open
+local io_close = io.close
+local ngx = ngx
+local ipairs = ipairs
+local pairs = pairs
+local tonumber = tonumber
+
+local _M = {}
+
+local tmp = {}
+function _M.generate_complex_value(data, ctx)
+    core.table.clear(tmp)
+
+    core.log.info("proxy-cache complex value: ", core.json.delay_encode(data))
+    for i, value in ipairs(data) do
+        core.log.info("proxy-cache complex value index-", i, ": ", value)
+
+        if string.byte(value, 1, 1) == string.byte('$') then
+            tmp[i] = ctx.var[string.sub(value, 2)] or ""
+        else
+            tmp[i] = value
+        end
+    end
+
+    return tab_concat(tmp, "")
+end
+
+
+-- check whether the request method match the user defined.
+function _M.match_method(conf, ctx)
+    for _, method in ipairs(conf.cache_method) do
+        if method == ctx.var.request_method then
+            return true
+        end
+    end
+
+    return false
+end
+
+
+-- check whether the response status match the user defined.
+function _M.match_status(conf, ctx)
+    for _, status in ipairs(conf.cache_http_status) do
+        if status == ngx.status then
+            return true
+        end
+    end
+
+    return false
+end
+
+
+function _M.file_exists(name)
+    local f = io_open(name, "r")
+    if f ~= nil then
+        io_close(f)
+        return true
+    end
+    return false
+end
+
+
+function _M.generate_cache_filename(cache_path, cache_levels, cache_key)
+    local md5sum = ngx.md5(cache_key)
+    local levels = ngx_re.split(cache_levels, ":")
+    local filename = ""
+
+    local index = #md5sum
+    for k, v in pairs(levels) do
+        local length = tonumber(v)
+        index = index - length
+        filename = filename .. md5sum:sub(index+1, index+length) .. "/"
+    end
+    if cache_path:sub(-1) ~= "/" then
+        cache_path = cache_path .. "/"
+    end
+    filename = cache_path .. filename .. md5sum
+    return filename
+end
+
+return _M