Is there a good way to reliably filter the response body from a FastCGI script
via NJS? I’ve done this with Lua before but NJS seems to be a bit different in
terms of how the response body process works. The end goal is basically that
we just have a way to grab the text back from a FastCGI/PHP script and can then
edit that response. There’s a very specific end goal that we are trying to
achieve that has to go through Nginx and can’t be done with PHP.
Initially I tried just using something like r.responseText since the call to
FastCGI in Nginx should be its own subrequest but that doesn’t seem to work.
I’ve tried via js_body_filter but that keeps returning what looks like either
encrypted or compressed data even though PHP compression is off and the FastCGI
upstream is for a socket on the same server defined as another location in the
same vhost (so the connection to the socket shouldn’t be suffering from
encryption in that layer).
I’ve tried a few different options:
location = /index.php {
include includes/fastcgi.conf;
js_body_filter db.failed;
fastcgi_pass unix:/var/run/php-fpm/account.sock;
}
With this being the function in db.js
function failed(r, data, flags){
r.error(data);
r.sendBuffer(data);
}
r.error is just there to log the response as a test to see what it is
structured like to code further from there. That logs data like this:
2022/02/16 11:56:20 [error] 18589#18589: *61 js: �Z�r���)
(ڕ��;�����LB��,��Y�;�rMa�3�b��!E�\��9/�C�KN�J�>%����()`fwv��%��A�,�u����n�4�{����?���^>;�ljI9�Dē&�&�LM�ܨ&�8�zҌ%S@Ű����
�S0E Q��f����+�Ia�LA)PERf��lU���2�F�`���fKȩ�\^V�1Y
^��b��n�:h�4#����O�i
��Fߏ=��93��O0���(Q0��)��?�,���
The response from the PHP file is just basic HTML so it shouldn’t look like
this.
I’ve also tried using a js_content filter to try to use a subrequest to the PHP
location block in the vhost, but that doesn’t seem to work at all. It just
errs out. Here’s a very basic attempt to try to use that location. I’ve tried
this both with the named location block and a custom named internal block that
I called /fastcgi to try to use the URI style syntax in the sub request.
The js_content filter is in a location block and is calling successfully but
the code that it runs fails when trying to sub request to FastCGI. Here’s a
rough example that I’ve tried.
location = /fastcgi {
internal;
include includes/fastcgi.conf;
fastcgi_pass unix:/var/run/php-fpm/dbadmin.sock;
}
async function content(r){
await r.subrequest('/fastcgi', {
body: r.requestBuffer,
method: r.method,
detached: false
}, function(r){
return r.responseText;
});
}
That just seems to err like this:
2022/02/16 11:53:37 [error] 16995#16995: *54 FastCGI sent in stderr: "Access to
the script '/home/account/www/fastcgi' has been denied (see
security.limit_extensions)" while reading response header from upstream,
client: 68.109.218.131, server:trequest: "GET /index.php HTTP/2.0", subrequest:
"/fastcgi", upstream: "fastcgi://unix:/var/run/php-fpm/account.sock:"
The specific solution strategy doesn’t particularly matter as long as the end
result is that we can receive and interact with the response body from a
FastCGI request.
Does anyone have any ideas of how to just get the response body from a FastCGI
request in NJS?
Any insights would be a huge help.
--
Lance Dockins
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