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<div class="moz-cite-prefix">Hello Lance,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">While I'm not 100% sure is there a
chance that the reply is gzipped? May be resetting
acccept-encoding header would help?</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Regards,</div>
<div class="moz-cite-prefix">Igor<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 17.02.2022 05:02, Lance Dockins
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:50840b6e-7f81-4bbb-8220-8d577f5983e0@Spark">
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<div dir="auto">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.<br>
<br>
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).<br>
<br>
I’ve tried a few different options:<br>
<br>
location = /index.php {<br>
<span style="white-space:pre"> include includes/fastcgi.conf;</span><br>
<br>
<span style="white-space:pre"> js_body_filter db.failed;</span><br>
<br>
<span style="white-space:pre"> fastcgi_pass unix:/var/run/php-fpm/account.sock;</span><br>
}<br>
<br>
With this being the function in db.js<br>
<br>
<span style="color:#cd8d4e;background-color:#383939">function</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#a97a8c;background-color:#383939">failed</span><span
style="color:#ffffff;background-color:#383939">(</span><em
style="color:#d9dbfc;background-color:#383939">r</em><span
style="color:#ffffff;background-color:#383939">, </span><em
style="color:#d9dbfc;background-color:#383939">data</em><span
style="color:#ffffff;background-color:#383939">, </span><em
style="color:#d9dbfc;background-color:#383939">flags</em><span
style="color:#ffffff;background-color:#383939">){</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">r</span><span
style="color:#c4bc3c;background-color:#383939">.</span><span
style="color:#a97a8c;background-color:#383939">error</span><span
style="color:#ffffff;background-color:#383939">(</span><span
style="color:#d9dbfc;background-color:#383939">data</span><span
style="color:#ffffff;background-color:#383939">);</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">r</span><span
style="color:#c4bc3c;background-color:#383939">.</span><span
style="color:#a97a8c;background-color:#383939">sendBuffer</span><span
style="color:#ffffff;background-color:#383939">(</span><span
style="color:#d9dbfc;background-color:#383939">data</span><span
style="color:#ffffff;background-color:#383939">);</span><br>
<span style="color:#ffffff;background-color:#383939">}</span><br>
<br>
<span style="color:#ffffff;background-color:rgba(0, 0, 0, 0)">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:</span><br>
<span style="white-space:pre">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</span><br>
^��b��n�:h�4#����O�i<br>
��Fߏ=��93��O0���(Q0��)��?�,���<br>
<br>
The response from the PHP file is just basic HTML so it
shouldn’t look like this. <br>
<br>
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.<br>
<br>
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.<br>
<br>
location = /fastcgi {<br>
<span style="white-space:pre"> internal;</span><br>
<span style="white-space:pre"> include includes/fastcgi.conf;</span><br>
<br>
<span style="white-space:pre"> fastcgi_pass unix:/var/run/php-fpm/dbadmin.sock;</span><br>
}<br>
<br>
<span style="color:#cd8d4e;background-color:#383939">async</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#cd8d4e;background-color:#383939">function</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#a97a8c;background-color:#383939">content</span><span
style="color:#ffffff;background-color:#383939">(</span><em
style="color:#d9dbfc;background-color:#383939">r</em><span
style="color:#ffffff;background-color:#383939">){</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#cd8d4e;background-color:#383939">await</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">r</span><span
style="color:#c4bc3c;background-color:#383939">.</span><span
style="color:#a97a8c;background-color:#383939">subrequest</span><span
style="color:#ffffff;background-color:#383939">(</span><span
style="color:#b9c87f;background-color:#383939">'/fastcgi'</span><span
style="color:#ffffff;background-color:#383939">, {</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">body</span><span
style="color:#c4bc3c;background-color:#383939">:</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">r</span><span
style="color:#c4bc3c;background-color:#383939">.</span><span
style="color:#d9dbfc;background-color:#383939">requestBuffer</span><span
style="color:#ffffff;background-color:#383939">,</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">method</span><span
style="color:#c4bc3c;background-color:#383939">:</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">r</span><span
style="color:#c4bc3c;background-color:#383939">.</span><span
style="color:#d9dbfc;background-color:#383939">method</span><span
style="color:#ffffff;background-color:#383939">,</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">detached</span><span
style="color:#c4bc3c;background-color:#383939">:</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#86a9c4;background-color:#383939">false</span><br>
<span style="color:#ffffff;background-color:#383939"> }, </span><span
style="color:#cd8d4e;background-color:#383939">function</span><span
style="color:#ffffff;background-color:#383939">(</span><em
style="color:#d9dbfc;background-color:#383939">r</em><span
style="color:#ffffff;background-color:#383939">){</span><br>
<span style="color:#ffffff;background-color:#383939"> </span><span
style="color:#cd8d4e;background-color:#383939">return</span><span
style="color:#ffffff;background-color:#383939"> </span><span
style="color:#d9dbfc;background-color:#383939">r</span><span
style="color:#c4bc3c;background-color:#383939">.</span><span
style="color:#d9dbfc;background-color:#383939">responseText</span><span
style="color:#ffffff;background-color:#383939">;</span><br>
<span style="color:#ffffff;background-color:#383939"> });</span><br>
<span style="color:#ffffff;background-color:#383939">}</span><br>
<br>
<br>
<span style="color:#ffffff;background-color:rgba(0, 0, 0, 0)">That
just seems to err like this:</span><br>
<br>
<span style="background-color:rgba(0, 0, 0, 0)">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:</span><a style="background-color:rgba(0, 0, 0, 0)"
href="http://db-ngxtest.wordkeeper.net" target="_blank"
moz-do-not-send="true">t</a><span
style="background-color:rgba(0, 0, 0, 0)">request: "GET
/index.php HTTP/2.0", subrequest: "/fastcgi", upstream:
"fastcgi://unix:/var/run/php-fpm/account.sock:"</span><br>
<br>
<span style="color:#ffffff;background-color:rgba(0, 0, 0, 0)">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.</span><br>
<br>
<span style="color:#ffffff;background-color:rgba(0, 0, 0, 0)">Does
anyone have any ideas of how to just get the response body
from a FastCGI request in NJS? </span><br>
<br>
<span style="color:#ffffff;background-color:rgba(0, 0, 0, 0)">Any
insights would be a huge help.</span></div>
</div>
<div name="messageSignatureSection"><br>
<div class="matchFont"><br>
--<br>
Lance Dockins<br>
<br>
</div>
</div>
<br>
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</blockquote>
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