Accessing POST parameters? about pistache HOT 16 OPEN

Hello,
has there been any updates on this issue?
I am currently trying to access binary data send using the POST.
(curl -v -0 -X POST "http://MYTESTHOST:8080/v2/updown" -H "accept: application/octet-stream" -H "Content-Type: multipart/form-data" -F "[email protected]" -F "foo=bar")
I can print the body but not access the data.
Thank you very much in advance.

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+1

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Hello.

You're right, currently, the API does not provide a way to access the POST parameters of a request other than getting the request.body() and parsing the parameters yourself.

I think that it might be a great addition to the API and will think about it.

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+1. It would be indeed a great feature.

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+1

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+1

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+1

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I think a middleware infrastructure could be a good approach once you could create custom parsers based on content type.

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Did anyone find out how to parse the post paremeters. I have a situation where multiple paremeters are being sent including binary, but can't work out how to parse the string effectively.

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I found out that you can post using json and use the nlohmann json library to parse the data, if that helps anyone.

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@oktal wrote:

Hello.

You're right, currently, the API does not provide a way to access the POST parameters of a request other than getting the request.body() and parsing the parameters yourself.

I think that it might be a great addition to the API and will think about it.

Agreed, but only the API should be extended. We already have a parameter parser:
https://github.com/oktal/pistache/blob/5752d4b1d6eb5171e15128171496b4c3f91c44ca/src/common/http.cc#L156-L188

I think that the parameter parser could somehow be extracted and be re-used to parse the request.body (), in case of a POST.

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I think that the parameter parser could somehow be extracted and be re-used to parse the request.body (), in case of a POST.

A closer look at the parser mentioned, showed that it will have to be modified a bit. The POST/PUT body parser should be capable of parse quoted (and possibly chunked) data, so using flex and bison might slowly start being a good option. Would the use of flex and bison for all parsing, throughout this lib, not be the way to go?

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The last time I checked (its been a long time), flex and bison did not create re-entrant, thread-safe or c++ "clean" parsers. If someone really wants a complex parser in pistache, I suggest that you look at using the "lemon parser" from the sqlite project.

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@dennisjenkins75
Hi Dennis,

for file operations, i need to get the file content that sent by browser, not i can get the body message how can i extract the file part ? is it supported by Pistache ?

the example body of my request :

----WebKitFormBoundarymANHtRsFm42ZLFBC^M
Content-Disposition: form-data; name="file"; filename="favicon.ico"^M
Content-Type: image/x-icon^M
^M
a½[±ÔÆ£AÕn¯XmS£ª[Ä^MÕ½)ã¬<80>ã/Xt¦°bÅÐO«ÅV^R¤L³{^M~<8f><82>´^?ïòå]ê_D$"ãëd©óÚÑ¥KXÁ§À 8^A<96>O^FXûÒÀ^R^]^AËï(XAÙ<85>æ<83>^UQ^LU^Bf¢¶Í"UMG<^U÷¤^BêOh<90>k^W\ê^?·,<9f>´biÿ¢ãç^T¿<98>:§<95>R£¦^V
------WebKitFormBoundarymANHtRsFm42ZLFBC--^M

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Pistache provides no direct support for parsing MIME requests. You'll need to use a mime parser (some other library) or write your own. I recommend using an existing library. However, I do not have any actual recommendations, as I've not needed to parse MIME in a long time.

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Yes, actually I reviewed the Pistache code and I can not find any MIME parser, also I searched for the fast, light weight and high performance low memory for MIME parser, but I can not find any, there are some MIME encoders but for decoder part the CGICC or FastCgi provide some, there were full MIME parser, and most part of them are implemented for mail message and also written in C, there were not fit to my usage, and also there were very complicated, I do not really parse all Content-Types, I only need to get binary files and formdata values, I am writing my own, file and formdata types are most used in HTTP servers, and cover more than 90% of all requests, the file part is most important part, once I finished and optimized my code will share with you as a PR, if you are interested in, you can merge, and the others people can use it as a part of Pistache to cover formdata, and file content types.

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