Fix handling of multipart/form-data #8280

That was my initial thought too. It might be a convenience if you avoid bytes for typical use, but a little confusing otherwise. Should we switch v4 to only create files when filename is passed or similar? We could use a sentinel so that filename=None would still create a file?

CHANGES/8280.breaking.rst

CHANGES/8280.bugfix.rst

aiohttp/multipart.py

codecov · 2024-04-05T16:34:48Z

Codecov Report

Attention: Patch coverage is 93.05556% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 97.54%. Comparing base (cbc0c86) to head (c02cab6).

Files	Patch %	Lines
aiohttp/multipart.py	91.11%	2 Missing and 2 partials ⚠️
aiohttp/formdata.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8280      +/-   ##
==========================================
+ Coverage   97.50%   97.54%   +0.04%     
==========================================
  Files         107      107              
  Lines       33026    33024       -2     
  Branches     3862     3872      +10     
==========================================
+ Hits        32201    32213      +12     
+ Misses        605      591      -14     
  Partials      220      220

Flag	Coverage Δ
CI-GHA	`97.45% <93.05%> (+0.03%)`	⬆️
OS-Linux	`97.12% <93.05%> (+0.03%)`	⬆️
OS-Windows	`95.61% <93.05%> (-0.03%)`	⬇️
OS-macOS	`96.83% <93.05%> (-0.03%)`	⬇️
Py-3.10.11	`95.46% <93.05%> (-0.03%)`	⬇️
Py-3.10.14	`96.92% <93.05%> (-0.03%)`	⬇️
Py-3.11.8	`97.12% <93.05%> (-0.03%)`	⬇️
Py-3.12.2	`97.24% <93.05%> (-0.03%)`	⬇️
Py-3.8.10	`95.39% <93.05%> (-0.03%)`	⬇️
Py-3.8.18	`96.77% <93.05%> (-0.03%)`	⬇️
Py-3.9.13	`95.43% <93.05%> (-0.03%)`	⬇️
Py-3.9.19	`96.90% <93.05%> (-0.02%)`	⬇️
Py-pypy7.3.15	`96.43% <93.05%> (?)`
VM-macos	`96.83% <93.05%> (-0.03%)`	⬇️
VM-ubuntu	`97.12% <93.05%> (+0.03%)`	⬆️
VM-windows	`95.61% <93.05%> (-0.03%)`	⬇️

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Dreamsorcerer · 2024-04-05T18:23:07Z

OK, I think this should be fine now. Will need a followup PR to do the actual removal in master.

bdraco · 2024-04-05T18:44:50Z

I'll be back home in an hour and can throw this on production to make sure there's no unexpected side effects

bdraco · 2024-04-05T19:15:29Z

The backport to 3.9 is messy because #3492 isn't in 3.9

bdraco · 2024-04-05T19:30:26Z

I squashed this, cherry-picked fcedc66, than cherry-picked this on to my 3.9 integration branch.

Testing that now

bdraco · 2024-04-05T19:35:32Z

Started up OK, and file uploads work. Watching the logs now.

bdraco · 2024-04-05T20:26:12Z

Nothing obvious showing up in the logs. Everything I could think to test still works

Dreamsorcerer · 2024-04-05T20:32:11Z

The backport to 3.9 is messy because #3492 isn't in 3.9

Guess we just backport that first then? Clearly got missed from any backports.

bdraco · 2024-04-05T20:46:24Z

The backport to 3.9 is messy because #3492 isn't in 3.9

Guess we just backport that first then? Clearly got missed from any backports.

While I'm not a big fan of the complexity added by #3492, given that PR is already accepted and merged, and this fix is developed on top of it, that seems like the most reasonable path forward.

Dreamsorcerer · 2024-04-05T21:13:06Z

The backport to 3.9 is messy because #3492 isn't in 3.9

Guess we just backport that first then? Clearly got missed from any backports.

While I'm not a big fan of the complexity added by #3492, given that PR is already accepted and merged, and this fix is developed on top of it, that seems like the most reasonable path forward.

Wait, is this multipart reader server-side or client-side? If it's server-side then the change will likely introduce another HTTP request smuggling vulnerability. If it's only server-side, then we'd probably be best reverting the commit. If it's both, then we probably want to backport it and add a followup PR to disable it when the parser is not in lax mode...

Dreamsorcerer · 2024-04-06T12:22:01Z

The backport to 3.9 is messy because #3492 isn't in 3.9

Guess we just backport that first then? Clearly got missed from any backports.

While I'm not a big fan of the complexity added by #3492, given that PR is already accepted and merged, and this fix is developed on top of it, that seems like the most reasonable path forward.

Wait, is this multipart reader server-side or client-side? If it's server-side then the change will likely introduce another HTTP request smuggling vulnerability. If it's only server-side, then we'd probably be best reverting the commit. If it's both, then we probably want to backport it and add a followup PR to disable it when the parser is not in lax mode...

I think this is server-side only, I think the best option right now is to revert that change as nobody seems to have missed the feature, given that it failed to make it into a release for 5 years.

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Dreamsorcerer · 2024-04-06T18:15:10Z

There are a couple of lines of coverage dropped in multipart.py:
https://app.codecov.io/gh/aio-libs/aiohttp/pull/8280/indirect-changes

I'm unclear how to get that covered again, or whether the code should maybe be deleted now. If anyone figures it out by tomorrow, feel free to just edit the PR directly.

patchback · 2024-04-07T11:28:19Z

Backport to 3.9: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 7d0be3f on top of patchback/backports/3.9/7d0be3fee540a3d4161ac7dc76422f1f5ea60104/pr-8280

Backporting merged PR #8280 into master

Ensure you have a local repo clone of your fork. Unless you cloned it
from the upstream, this would be your origin remote.
Make sure you have an upstream repo added as a remote too. In these
instructions you'll refer to it by the name upstream. If you don't
have it, here's how you can add it:
```
$ git remote add upstream https://github.com/aio-libs/aiohttp.git
```

Ensure you have the latest copy of upstream and prepare a branch
that will hold the backported code:

$ git fetch upstream
$ git checkout -b patchback/backports/3.9/7d0be3fee540a3d4161ac7dc76422f1f5ea60104/pr-8280 upstream/3.9

Now, cherry-pick PR Fix handling of multipart/form-data #8280 contents into that branch:
```
$ git cherry-pick -x 7d0be3fee540a3d4161ac7dc76422f1f5ea60104
```
If it'll yell at you with something like fatal: Commit 7d0be3fee540a3d4161ac7dc76422f1f5ea60104 is a merge but no -m option was given., add -m 1 as follows instead:
```
$ git cherry-pick -m1 -x 7d0be3fee540a3d4161ac7dc76422f1f5ea60104
```
At this point, you'll probably encounter some merge conflicts. You must
resolve them in to preserve the patch from PR Fix handling of multipart/form-data #8280 as close to the
original as possible.

Push this branch to your fork on GitHub:

$ git push origin patchback/backports/3.9/7d0be3fee540a3d4161ac7dc76422f1f5ea60104/pr-8280

Create a PR, ensure that the CI is green. If it's not — update it so that
the tests and any other checks pass. This is it!
Now relax and wait for the maintainers to process your pull request
when they have some cycles to do reviews. Don't worry — they'll tell you if
any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

patchback · 2024-04-07T11:28:25Z

Backport to 3.10: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 7d0be3f on top of patchback/backports/3.10/7d0be3fee540a3d4161ac7dc76422f1f5ea60104/pr-8280

Backporting merged PR #8280 into master

Ensure you have a local repo clone of your fork. Unless you cloned it
from the upstream, this would be your origin remote.
Make sure you have an upstream repo added as a remote too. In these
instructions you'll refer to it by the name upstream. If you don't
have it, here's how you can add it:
```
$ git remote add upstream https://github.com/aio-libs/aiohttp.git
```

Ensure you have the latest copy of upstream and prepare a branch
that will hold the backported code:

$ git fetch upstream
$ git checkout -b patchback/backports/3.10/7d0be3fee540a3d4161ac7dc76422f1f5ea60104/pr-8280 upstream/3.10

Now, cherry-pick PR Fix handling of multipart/form-data #8280 contents into that branch:
```
$ git cherry-pick -x 7d0be3fee540a3d4161ac7dc76422f1f5ea60104
```
If it'll yell at you with something like fatal: Commit 7d0be3fee540a3d4161ac7dc76422f1f5ea60104 is a merge but no -m option was given., add -m 1 as follows instead:
```
$ git cherry-pick -m1 -x 7d0be3fee540a3d4161ac7dc76422f1f5ea60104
```
At this point, you'll probably encounter some merge conflicts. You must
resolve them in to preserve the patch from PR Fix handling of multipart/form-data #8280 as close to the
original as possible.

Push this branch to your fork on GitHub:

$ git push origin patchback/backports/3.10/7d0be3fee540a3d4161ac7dc76422f1f5ea60104/pr-8280

Create a PR, ensure that the CI is green. If it's not — update it so that
the tests and any other checks pass. This is it!
Now relax and wait for the maintainers to process your pull request
when they have some cycles to do reviews. Don't worry — they'll tell you if
any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

https://datatracker.ietf.org/doc/html/rfc7578 (cherry picked from commit 7d0be3f)

Fix handling of multipart/form-data

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Dreamsorcerer merged commit 7d0be3f into master Apr 7, 2024
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Dreamsorcerer deleted the Dreamsorcerer-patch-6 branch April 7, 2024 11:28

Dreamsorcerer added a commit that referenced this pull request Apr 7, 2024

Fix handling of multipart/form-data (#8280)

2fdcf49

https://datatracker.ietf.org/doc/html/rfc7578 (cherry picked from commit 7d0be3f)

Dreamsorcerer added a commit that referenced this pull request Apr 7, 2024

Fix handling of multipart/form-data (#8280)

de19957

https://datatracker.ietf.org/doc/html/rfc7578 (cherry picked from commit 7d0be3f)

Dreamsorcerer added a commit that referenced this pull request Apr 7, 2024

Fix handling of multipart/form-data (#8280) (#8301)

767c413

https://datatracker.ietf.org/doc/html/rfc7578 (cherry picked from commit 7d0be3f)

Dreamsorcerer added a commit that referenced this pull request Apr 7, 2024

Fix handling of multipart/form-data (#8280) (#8302)

cebe526

https://datatracker.ietf.org/doc/html/rfc7578 (cherry picked from commit 7d0be3f)

beagold mentioned this pull request Apr 12, 2024

Fix warning raised in aiohttp 3.9.4 regarding deprecated content_transfer_encoding argument hikari-py/hikari#1881

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Fix handling of multipart/form-data #8280

Fix handling of multipart/form-data #8280

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Fix handling of multipart/form-data #8280

Fix handling of multipart/form-data #8280

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Backport to 3.9: 💔 cherry-picking failed — conflicts found

Backporting merged PR #8280 into master

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Backport to 3.10: 💔 cherry-picking failed — conflicts found

Backporting merged PR #8280 into master

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