ngx API and internal locations

oresty.ml · 2017-09-18T22:46:30+00:00

Hello! On Sat, Sep 16, 2017 at 11:52 PM, 'Martin Östmark' via openresty-en wrote: > I'm just wondering what the target date for the next release is...

ngx API and internal locations

oresty.ml

Hi,
SSOwat is a simple SSO based on lua-nginx-module. I want to use it.
It is rather simple; basically:
1. browser: GET /uri
2. nginx: access_by_lua_file sso.lua
3. lua: ngx.redirect /sso/login?r=/uri
4. browser: POST /sso/login (r=/uri, user=..., password=...)
5. nginx: access_by_lua_file sso.lua
6. lua: ngx.redirect /uri (with login info, so that it does not loop)

But I have a: location /other_uri {
    internal
    ...
}
and an internal rewrite from /uri to /other_uri in my Nginx conf.

My problems:

- Between step 1. and step 2., Nginx does the rewriting, so the value inngx.val.uri is "/other_uri" instead of "/uri". I wish I could matchagainst /uri but I can accept to match against /other_uri instead...- Step 6 does not work because a redirect to the internal /other_urilocation is not permitted!

I tried to use ngx.exec instead of ngx.redirect, but I get issues becausethe browser still thinks it is on /uri...


Is there a way to get the URI exactly as it was requested by the browser?
Thanks,

Yves.

hamish.forbes

Try using ngx.var.request_uri instead (http://nginx.org/en/docs/http/ngx_http_core_module.html#var_request_uri)

Bear in mind this will include the query string.

On Monday, 18 September 2017 15:46:34 UTC+1, ores...@yalis.fr wrote:

Hi,
SSOwat is a simple SSO based on lua-nginx-module. I want to use it.
It is rather simple; basically:
1. browser: GET /uri
2. nginx: access_by_lua_file sso.lua
3. lua: ngx.redirect /sso/login?r=/uri
4. browser: POST /sso/login (r=/uri, user=..., password=...)
5. nginx: access_by_lua_file sso.lua
6. lua: ngx.redirect /uri (with login info, so that it does not loop)

But I have a: location /other_uri {
internal
...
}
and an internal rewrite from /uri to /other_uri in my Nginx conf.

My problems:
- Between step 1. and step 2., Nginx does the rewriting, so the value in
ngx.val.uri is "/other_uri" instead of "/uri". I wish I could match
against /uri but I can accept to match against /other_uri instead...
- Step 6 does not work because a redirect to the internal /other_uri
location is not permitted!

I tried to use ngx.exec instead of ngx.redirect, but I get issues because
the browser still thinks it is on /uri...

Is there a way to get the URI exactly as it was requested by the browser?
Thanks,

Yves.

On Monday, 18 September 2017 15:46:34 UTC+1, ores...@yalis.fr wrote:

Hi,
SSOwat is a simple SSO based on lua-nginx-module. I want to use it.
It is rather simple; basically:
1. browser: GET /uri
2. nginx: access_by_lua_file sso.lua
3. lua: ngx.redirect /sso/login?r=/uri
4. browser: POST /sso/login (r=/uri, user=..., password=...)
5. nginx: access_by_lua_file sso.lua
6. lua: ngx.redirect /uri (with login info, so that it does not loop)

But I have a: location /other_uri {
internal
...
}
and an internal rewrite from /uri to /other_uri in my Nginx conf.

My problems:
- Between step 1. and step 2., Nginx does the rewriting, so the value in
ngx.val.uri is "/other_uri" instead of "/uri". I wish I could match
against /uri but I can accept to match against /other_uri instead...
- Step 6 does not work because a redirect to the internal /other_uri
location is not permitted!

I tried to use ngx.exec instead of ngx.redirect, but I get issues because
the browser still thinks it is on /uri...

Is there a way to get the URI exactly as it was requested by the browser?
Thanks,

Yves.

oresty.ml

Le 18/09/2017 à 17:39, Hamish Forbes a écrit :

Try using ngx.var.request_uri instead (http://nginx.org/en/docs/http/ngx_http_core_module.html#var_request_uri)
Bear in mind this will include the query string.

Thank you Hamish, that was an excellent idea, spot on! Unfortunately, for some reason, ngx.var.request_uri always returns “nil” :-(

Yves.

On Monday, 18 September 2017 15:46:34 UTC+1, ores...@yalis.fr wrote:
Hi,
SSOwat is a simple SSO based on lua-nginx-module. I want to use it.
It is rather simple; basically:
1. browser: GET /uri
2. nginx: access_by_lua_file sso.lua
3. lua: ngx.redirect /sso/login?r=/uri
4. browser: POST /sso/login (r=/uri, user=..., password=...)
5. nginx: access_by_lua_file sso.lua
6. lua: ngx.redirect /uri (with login info, so that it does not loop)

But I have a: location /other_uri {
internal
...
}
and an internal rewrite from /uri to /other_uri in my Nginx conf.

My problems:
- Between step 1. and step 2., Nginx does the rewriting, so the value in
ngx.val.uri is "/other_uri" instead of "/uri". I wish I could match
against /uri but I can accept to match against /other_uri instead...
- Step 6 does not work because a redirect to the internal /other_uri
location is not permitted!

I tried to use ngx.exec instead of ngx.redirect, but I get issues because
the browser still thinks it is on /uri...

Is there a way to get the URI exactly as it was requested by the browser?
Thanks,

Yves.

agentzh

Hello!

On Mon, Sep 18, 2017 at 11:16 AM, oresty.ml via openresty-en wrote:
>
> Thank you Hamish, that was an excellent idea, spot on! Unfortunately, for
> some reason, ngx.var.request_uri always returns “nil” :-(
>

This should work as long as you are using it in the request context.
Please provide a minimal and standalone example that can reproduce the
problem on others' machines so that we can have a look.

Regards,
Yichun

oresty.ml

Le 18/09/2017 à 22:05, Yichun Zhang (agentzh) a écrit :

Hello!

On Mon, Sep 18, 2017 at 11:16 AM, oresty.ml via openresty-en wrote:

Thank you Hamish, that was an excellent idea, spot on! Unfortunately, for
some reason, ngx.var.request_uri always returns “nil” :-(

This should work as long as you are using it in the request context.

What do you mean by “request context”? I know of main, http, server,location on Nginx’ side…

Please provide a minimal and standalone example that can reproduce the
problem on others' machines so that we can have a look.

Thanks Yichum! By trying to reproduce the problem in a _minimal_example, I failed to get nil… I conclude that either this variable canbe read only once, or that some actions made by the lua code have theconsequence of clearing that variable. So now I know that this must beread once at the start, and stored for further use ;-)

Regards,
Yichun

Cheers,

Yves.