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Bug #79764 finfo::file returns text/plain mime type when JSON contains empty arrays
Submitted: 2020-07-01 12:26 UTC Modified: 2020-07-01 14:10 UTC
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: edi dot modric at gmail dot com Assigned: cmb (profile)
Status: Not a bug Package: Filesystem function related
PHP Version: 7.4.7 OS: Ubuntu 20.04
Private report: No CVE-ID: None
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 [2020-07-01 12:26 UTC] edi dot modric at gmail dot com
Using the following JSON document:

    "foo": []

finfo::file method wrongly returns text/plain as mime type instead of application/json.

Modifying the JSON document to e.g.:

    "foo": ["bar"]

makes the function behave correctly and returns application/json.

Test script:

$finfo = new finfo(FILEINFO_MIME_TYPE);

echo $finfo->file('file.json') . PHP_EOL;

Expected result:
With the following content of file.json:

    "foo": []

I expect to see "application/json" as the output.

Actual result:
With the following content of file.json:

    "foo": []

"text/plain" is returned.


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 [2020-07-01 12:48 UTC] mamontovdmitriy at mail dot ru
I confirm this issue.
 [2020-07-01 13:31 UTC]
What does `file` report about that file?
 [2020-07-01 13:39 UTC] edi dot modric at gmail dot com
eddie@abyss ~ $ file a.json
a.json: ASCII text

eddie@abyss ~ $ file b.json
b.json: JSON data

So it seems this might not be a PHP issue, but a system one. If so, feel free to close this and sorry for the noise.
 [2020-07-01 14:10 UTC]
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2020-07-01 14:10 UTC]
No problem. :)
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