Name

lua-resty-cookie - This library parses HTTP Cookie header for Nginx and returns each field in the cookie.

Status

This library is production ready.

Synopsis

        lua_package_path "/path/to/lua-resty-cookie/lib/?.lua;;";
    
        server {
            location /test {
                content_by_lua '
                    local ck = require "resty.cookie"
                    local cookie, err = ck:new()
                    if not cookie then
                        ngx.log(ngx.ERR, err)
                        return
                    end
    
                    -- get single cookie
                    local field, err = cookie:get("lang")
                    if not field then
                        ngx.log(ngx.ERR, err)
                        return
                    end
                    ngx.say("lang", " => ", field)
    
                    -- get all cookies
                    local fields, err = cookie:get_all()
                    if not fields then
                        ngx.log(ngx.ERR, err)
                        return
                    end
    
                    for k, v in pairs(fields) do
                        ngx.say(k, " => ", v)
                    end
    
                    -- set one cookie
                    local ok, err = cookie:set({
                        key = "Name", value = "Bob", path = "/",
                        domain = "example.com", secure = true, httponly = true,
                        expires = "Wed, 09 Jun 2021 10:18:14 GMT", max_age = 50,
                        samesite = "Strict", extension = "a4334aebaec"
                    })
                    if not ok then
                        ngx.log(ngx.ERR, err)
                        return
                    end
    
                    -- set another cookie, both cookies will appear in HTTP response
                    local ok, err = cookie:set({
                        key = "Age", value = "20",
                    })
                    if not ok then
                        ngx.log(ngx.ERR, err)
                        return
                    end
                ';
            }
        }

Methods

new

syntax: cookie_obj = cookie()

Create a new cookie object for current request. You can get parsed cookie from client or set cookie to client later using this object.

get

syntax: cookie_val, err = cookie_obj:get(cookie_name)

Get a single client cookie value. On error, returns nil and an error message.

get_all

syntax: fields, err = cookie_obj:get_all()

Get all client cookie key/value pairs in a lua table. On error, returns nil and an error message.

get_cookie_size

syntax: size = cookie_obj:get_cookie_size()

Get the cookie size, i.e the string length of the cookie header value.

set

    syntax: ok, err = cookie_obj:set({
        key = "Name",
        value = "Bob",
        path = "/",
        domain = "example.com",
        secure = true, httponly = true,
        expires = "Wed, 09 Jun 2021 10:18:14 GMT",
        max_age = 50,
        samesite = "Strict",
        extension = "a4334aebaec"
    })

Set a cookie to client. This will add a new 'Set-Cookie' response header. key and value are required, all other fields are optional. If the same cookie (whole cookie string, e.g. "Name=Bob; Expires=Wed, 09 Jun 2021 10:18:14 GMT; Max-Age=50; Domain=example.com; Path=/; Secure; HttpOnly;") has already been setted, new cookie will be ignored.

get_cookie_string

    syntax: cookie_string, err = cookie.get_cookie_string({ --[[ see "set" method ]] })

Returns a cookie string representing the table passed. See the set method for details, but unlike set, this function doesn't change the current request response, but just return the generated string. On error, returns nil and an error message.

This is a static function, not a method of the cookie object.

Installation

You need to compile ngx_lua with your Nginx.

You need to configure the lua_package_path directive to add the path of your lua-resty-cookie source tree to ngx_lua's Lua module search path, as in

    # nginx.conf
    http {
        lua_package_path "/path/to/lua-resty-cookie/lib/?.lua;;";
        ...
    }

and then load the library in Lua:

    local ck = require "resty.cookie"

Authors

Jiale Zhi <vipcalio@gmail.com>, CloudFlare Inc.

Yichun Zhang (agentzh) <agentzh@gmail.com>, CloudFlare Inc.

Copyright and License

This module is licensed under the BSD license.

Copyright (C) 2013, by Jiale Zhi <vipcalio@gmail.com>, CloudFlare Inc.

Copyright (C) 2013, by Yichun Zhang <agentzh@gmail.com>, CloudFlare Inc.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.