在 or 中简单的使用cookies 复杂的操作请使用 lua_resty_cookies

基本操作
获取一个cookies, cookies的 name 叫做 session

local cookie_name = "cookie_session"
ngx.say(ngx.var[cookie_name])

设置 cookies

ngx.header["Set-Cookie"] = "session=af54; Path=/; Expires=" .. 
ngx.cookie_time(ngx.time() + 86400)

测试代码

    location ~ /header_add {
        content_by_lua_block {
            ngx.header["Set-Cookie"] = "session=lzz; Path=/; Expires=" ..
                                       ngx.cookie_time(ngx.time() + 86400)
            ngx.say("orangleliu")
        }
    }看看效果

curl -i 127.0.0.1:8001/header_add

HTTP/1.1 200 OK
Server: openresty/1.9.7.1
Date: Fri, 16 Dec 2016 07:00:30 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: session=lzz; Path=/; Expires=Sat, 17-Dec-16 07:00:30 GMT

set cookie 使用的是直接操作 header 的方式，这个时候如果单独添加一个 cookie 就会覆盖掉其他的值，所以需要多做一些处理。

function get_cookies()
local cookies = ngx.header["Set-Cookie"] or {}
if type(cookies) == "string" then
cookies = {cookies}
end
return cookies
end

function add_cookie(cookie)
local cookies = get_cookies()
table.insert(cookies, cookie)
ngx.header['Set-Cookie'] = cookies
end

add_cookie("session=aff12d; Path=/")

⚠️：上面的代码需要在 header_filter 阶段运行，在这个阶段可以获取 应用或者是后端 proxy 设置的 cookies， 如果你想要 添加，删除，替换某一个 cookies，注意不要覆盖所有的 cookies 了。

删除 cookies 跟上面类似
一个例子，在 content 阶段设置了多个 cookies，然后在 header_filter 阶段删除 cookies

    location ~ /header_delete {
        content_by_lua_block {
            ngx.header["Set-Cookie"] = {'Foo=abc; path=/', 'age=18; path=/'}
            ngx.say("openresty")
        }

        header_filter_by_lua_block {
            local match = string.match

            local function get_cookies()
                -- local cookies = ngx.header["Set-Cookie"] or {}
                local cookies = ngx.header.set_cookie or {}
                if type(cookies) == "string" then
                    cookies = {cookies}
                end
                return cookies
            end

            local function remove_cookie(cookie_name)
                local cookies = get_cookies()

                ngx.log(ngx.ERR, "source cookies ", table.concat(cookies, " "))
                for key, value in ipairs(cookies) do
                    local name = match(value, "(.-)=")
                    ngx.log(ngx.ERR, key.."<=>", value)
                    if name == cookie_name then
                        table.remove(cookies, key)
                    end
                end

                ngx.header['Set-Cookie'] = cookies or {}
                ngx.log(ngx.ERR, "new cookies ", table.concat(cookies, " "))
            end

            remove_cookie("Foo")
        }
    }

}

测试下

curl ‘127.0.0.1:8001/header_delete’ -i

HTTP/1.1 200 OK
Server: openresty/1.9.7.1
Date: Fri, 16 Dec 2016 08:07:34 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: age=18; path=/

其他需求
在做 proxy_pass 之后想给请求统一修改 cookies 值这么做呢？反正都很类似了。。
使用 header_filter_by_lua 指令

header_filter_by_lua '
local cookies = ngx.header.set_cookie
if cookies then
if type(cookies) ~= "table" then
cookies = {cookies}
end
local gsub = string.gsub
local changed
for i, cookie in ipairs(cookies) do
local new_cookie = gsub(cookie, "^target%-cookie=[^;]*", "target-cookie=myvalue", 1)
if new_cookie ~= cookie then
cookies[i] = new_cookie
changed = true
end
end
if changed then
ngx.header.set_cookie = cookies
end
end
';

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