how to get and set cookies?

[luoqi]

please!

[agentzh]

To get cookie "Foo":

local cookie_value = ngx.var.cookie_Foo

To write a cookie Foo:

ngx.header['Set-Cookie'] = 'Foo=abc; path=/'

[luoqi]

thank you!

[mvreg]

I have dynamic cookie names, that are defined in nginx-Lua.
local cookie_name="UID2"

How do I read it? I tryed:
local cookie_value = ngx.var[cookie_name]

but it fails.

Any other way?

[agentzh]

You're referring to the $UID2 nginx variable in your Lua code. What you really need is $cookie_UID2:

local cookie_name = "UID2"
local var_name = "cookie_" .. cookie_name
local cookie_value = ngx.var[var_name]

[gauravt]

Can we also set an expiry time to it?

[agentzh]

Sure!

local expires = 3600 * 24  -- 1 day
ngx.header["Set-Cookie"] = "session=blah; Path=/; Expires=" .. ngx.cookie_time(ngx.time() + expires)

See the wikipedia page for more details on the Set-Cookie response header format:

http://en.wikipedia.org/wiki/HTTP_cookie

[gauravt]

Thanks Yichun,
Its working, But when I'm trying to add two cookies together inside a if loop it simply ignores one cookie:
if name== 'new'
local expires = 3600;
ngx.header["Set-Cookie"] = "redirected_from_success=YES; path=/; domain=.freecultr.com; Expires=" .. ngx.cookie_time(ngx.time() +expires); <----THIS Doesn't Works

ngx.header["Set-Cookie"] = "success_rendered=YES; path=/; domain=.freecultr.com; Expires=" .. ngx.cookie_time(ngx.time()+60) <----THIS Works
end
Note: These cookies exists before its overwritten by lua.

[agentzh]

@gauravt Assignment to ngx.header.HEADER always overwrites existing HEADER headers. This is by design.

To set multiple headers with the same name, you should assign a Lua array-like table to ngx.header.HEADER, as in

ngx.header["Set-Cookie"] = { cookie1, cookie2, cookie3 }

You can collect all the cookies in your Lua loop in a Lua table, and assign it after the loop in a single run.

[gauravt]

Thanks!!

[ghost]

How to get all the cookies?

[agentzh]

@DSanthosh See https://github.com/cloudflare/lua-resty-cookie for an example.

[Octolus]

I am in need of similar.

I want to check if cookie exist, if it doesn't I want to set it. How?

[agentzh]

@TechPulse I think you can just use the builtin nginx variable $cookie_NAME documented below:

http://nginx.org/en/docs/http/ngx_http_core_module.html#var_cookie_

In Lua, you can just test ngx.var.cookie_blah if you want to see if the cookie named "blah" present in the request.

[Fr3DBr]

After using ngx.header["Set-Cookie"] in rewrite_by_lua, the Content-Type: header is corrupted, not sure why, but it happens, here's the output:

Date: Sat, 14 Jan 2017 11:47:28 GMT
Content-Type: text/html^@^@^@^@^S�D^@^@^@^@^@��D
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding

The code used to produce this was:

               cname1="COK1_"
               cname2="COK2_"
               cval1="asdjASDJasjdasdjasdiewqeqwoweaksdk1"
               cval2="09as9d0as9d0912k123k12k3aid9asd91#"
               local cookie1    = cname1 .. "=" .. cval1 .. "; Path=/; Expires=" .. ngx.cookie_time(ngx.time() + expire)
                local cookie2    = cname2 .. "=" .. cval2 .. "; Path=/; Expires=" .. ngx.cookie_time(ngx.time() + expire)
                ngx.header["Set-Cookie"] = { cookie1, cookie2 }