昨天写了个地址重写的 Kong 自定义插件，跟大家分享下，话不多说，上代码

schema.lua

return {
    no_consumer = true,
    fields = {
        regex = { type = "string" },
        replacement = { type = "string" },
        flag = {type = "string"},
    },
    self_check = function(schema, plugin_t, dao, is_update)
        return true
    end
}

handler.lua

local BasePlugin = require "kong.plugins.base_plugin"
local json = require("cjson")
local RewriteHandler = BasePlugin:extend()
local ngx = ngx
local kong = kong

RewriteHandler.PRIORITY = 2000
RewriteHandler.VERSION = "0.1.0"

function RewriteHandler:access(conf)
    RewriteHandler.super.access(self)

    local host = ngx.var.host
    kong.log("Debug http-rewrite plugin, host is: ", host, " ,uri is: ", ngx.var.request_uri, " service is: ",service," ,config is: ", json.encode(conf))

    kong.log("Debug http-rewrite plugin, regex is: ",regex, " replacement is : ",replacement)
    local replace,n,err  = ngx.re.sub(ngx.var.request_uri, conf.regex, conf.replacement)
    if replace and n == 0 then
        return
    end

    if err then
        kong.log("Error http-rewrite plugin, ngx.re.sub err: ",err, " ,host is: ", host, " ,uri is: ",
            ngx.var.request_uri, " ,config is: ", json.encode(conf))
        return
    end

    kong.log("Debug http-rewrite plugin, replace is: ",replace)
    if conf.flag == "redirect" then
        ngx.redirect(replace,302)
    elseif conf.flag == "permanent" then
        ngx.redirect(replace,301)
    end
end

function RewriteHandler:new()
    RewriteHandler.super.new(self, "http-rewrite")
end

return RewriteHandler

效果如下：
rewrite plugins

开启该插件后，访问 http://dev.lyafei.com:8000/api/appmarket/app/appmarket/1.2/?service=/checkapp 被自动重定向到 http://dev.lyafei.com:8000/api/appstore/app/appmarket/1.2/?service=/checkapp
http rewrite

最后修改：2020 年 06 月 09 日 12 : 41 PM
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