Invalid page size parameter causes a 500 Internal Server Error

[weierophinney]

If you configure a page size parameter, values that are not positive integers (or -1) will result in a 500 Internal Server Error and a stack trace. The exceptions that trigger this (vendor/zfcampus/zf-hal/src/Collection.php line 302 and 310) indicate the problem is one of validation rather than something going wonky on the server. IMHO, this should not be a 500, but could either be a 400 or 422 or it could "fail safe" back to using the configured default and not causing an error at all.

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Originally posted by @dstockto at zfcampus/zf-hal#141

[weierophinney]

Since this was opened, the class has been updated so that -1 indicates no pagination. So the above is still true for values that are not positive integers, other than -1. The exceptions thrown are now on 287 and 295 instead of the original 302 and 310.

It appears the fix for this would probably be in zf-rest in \ZF\Rest\RestController in prepareHalCollection. The call to $collection->setPageSize($this->getPageSize()); could be wrapped in a try..catch and return an ApiProblem rather than letting the ZF\Hal\Exception\InvalidArgumentException bubble all the way out and become a 500. If this sounds like an acceptable way of handling it, I'm happy to make a PR. I don't think this should be a 5xx error though.

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Originally posted by @dstockto at zfcampus/zf-hal#141 (comment)