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/echo.lua

@@ -0,0 +1,121 @@
+--
+-- 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 pairs       = pairs
+local type        = type
+local ngx         = ngx
+
+
+local schema = {
+    type = "object",
+    properties = {
+        before_body = {
+            description = "body before the filter phase.",
+            type = "string"
+        },
+        body = {
+            description = "body to replace upstream response.",
+            type = "string"
+        },
+        after_body = {
+            description = "body after the modification of filter phase.",
+            type = "string"
+        },
+        headers = {
+            description = "new headers for response",
+            type = "object",
+            minProperties = 1,
+        },
+    },
+    anyOf = {
+        {required = {"before_body"}},
+        {required = {"body"}},
+        {required = {"after_body"}}
+    },
+    minProperties = 1,
+}
+
+local plugin_name = "echo"
+
+local _M = {
+    version = 0.1,
+    priority = 412,
+    name = plugin_name,
+    schema = schema,
+}
+
+
+function _M.check_schema(conf)
+    local ok, err = core.schema.check(schema, conf)
+    if not ok then
+        return false, err
+    end
+
+    return true
+end
+
+
+function _M.body_filter(conf, ctx)
+    if conf.body then
+        ngx.arg[1] = conf.body
+        ngx.arg[2] = true
+    end
+
+    if conf.before_body and not ctx.plugin_echo_body_set then
+        ngx.arg[1] = conf.before_body ..  ngx.arg[1]
+        ctx.plugin_echo_body_set = true
+    end
+
+    if ngx.arg[2] and conf.after_body then
+        ngx.arg[1] = ngx.arg[1] .. conf.after_body
+    end
+end
+
+
+function _M.header_filter(conf, ctx)
+    if conf.body or conf.before_body or conf.after_body then
+        core.response.clear_header_as_body_modified()
+    end
+
+    if not conf.headers then
+        return
+    end
+
+    if not conf.headers_arr then
+        conf.headers_arr = {}
+
+        for field, value in pairs(conf.headers) do
+            if type(field) == 'string'
+                    and (type(value) == 'string' or type(value) == 'number') then
+                if #field == 0 then
+                    return false, 'invalid field length in header'
+                end
+                core.table.insert(conf.headers_arr, field)
+                core.table.insert(conf.headers_arr, value)
+            else
+                return false, 'invalid type as header value'
+            end
+        end
+    end
+
+    local field_cnt = #conf.headers_arr
+    for i = 1, field_cnt, 2 do
+        ngx.header[conf.headers_arr[i]] = conf.headers_arr[i+1]
+    end
+end
+
+return _M