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Fix create SimpleFile with empty content #21386

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Fix create SimpleFile with empty content #21386

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d0niek
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@d0niek d0niek commented Jun 12, 2020

After that change #19493 where
you have to provide content to method newFile is a bug with empty ''
content.

Php function file_put_contents will returns the numbers of bytes that
written to the file, or FALSE on failure
https://www.php.net/manual/en/function.file-put-contents.php

So for empty '' content it will return 0 which is true for this
statement:

if (!$result) {
    throw new NotPermittedException('Could not create path');
}

From now empty content will not throws an exception.

After that change #19493 where
you have to provide content to method `newFile` is a bug with empty `''`
content.

Php function `file_put_contents` will returns the numbers of bytes that
written to the file, or `FALSE` on failure
https://www.php.net/manual/en/function.file-put-contents.php

So for empty `''` content it will return `0` which is `true` for this
statement:

```
if (!$result) {
    throw new NotPermittedException('Could not create path');
}
```

From now empty content will not throws an exception.
@kesselb
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kesselb commented Jun 12, 2020

Thanks 👍

That looks danger. If the underlying storage is an object store for example the result might be true instead of 0. The storage adapter "local" should be changed to follow the interface and return a boolean always.

public function file_put_contents($path, $data) {
return file_put_contents($this->getSourcePath($path), $data);
}

@kesselb kesselb added 3. to review Waiting for reviews bug labels Jun 12, 2020
@kesselb kesselb added this to the Nextcloud 20 milestone Jun 12, 2020
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@rullzer rullzer left a comment

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Looks good.
Would you mind also adding a test case?

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@rullzer rullzer left a comment

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Ah woops. Yes @kesselb is right. Please modify the local storage to behave properly.

@d0niek
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d0niek commented Jun 15, 2020

The same "problem" is here:

public function file_put_contents($path, $data) {
$handle = $this->fopen($path, "w");
$this->removeCachedFile($path);
$count = fwrite($handle, $data);
fclose($handle);
return $count;
}

Implementation is not Ok with the interface:
/**
* see http://php.net/manual/en/function.file_put_contents.php
*
* @param string $path
* @param string $data
* @return bool
* @since 6.0.0
*/
public function file_put_contents($path, $data);
.
I can fix it but is it Ok? Origin file_put_contents return how much bytes were written and maybe someone wants to compare it with data sent to the method?

What about test case, I can write it too but there aren't any test cases with content so should I write them too?

@MorrisJobke MorrisJobke mentioned this pull request Aug 11, 2020
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Another fix went into master already: #22237

@MorrisJobke MorrisJobke removed this from the Nextcloud 20 milestone Aug 20, 2020
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4 participants