Add internal URI handling API

[kocsismate]

Part of #14461

[TimWolla]

Some first remarks. Did not yet look at everything.

[TimWolla]

Defaulting to parse_url in a new API is probably not a good idea. Instead the “legacy” users should just pass "parse_url" explicitly.

[kocsismate]

Defaulting to parse_url here works because that's the default indeed where php_uri_get_handler() is called, the other "backends" can only be used if the config is explicitly passed (not null).

The other reason why I opted for this approach is that it would be inconvenient to create and free a new zend_string when the legacy implementation is needed, and I wanted to avoid adding a known string just for this purpose, or exposing the C string based uri_handler_by_name function instead.

[TimWolla]

I've looked at this again and I must say that I'm having trouble meaningfully reviewing this. It adds a large amount of code with unclear purpose and confusing (to me) naming.

[ndossche]

Preliminary review round

[ndossche]

The switch from zend_string to the pointer-length pair seems to have been a good idea

[TimWolla]

I'll try to take another look tomorrow.

[kocsismate]

@nielsdos Do you see anything that I should fix before merging it? I'd like to implement some of the cleanups that we discussed

[ndossche]

Looks mostly good, FWIW I agree with Tim on UNREACHABLE

[kocsismate]

I wanted to keep these assertions even though two handlers of the legacy parser became NULL. So I excluded this URI handler from the checks.

[ndossche]

Assertions with exceptions to the rule are a bit iffy IMHO

[kocsismate]

Yes, I can understand your POV. Do you think it's better to get rid of the latter two special cased assertions?

[kocsismate]

As I renamed the legacy implementation to "", I wanted to make sure that other implementations cannot use the same handler.

Although, I think this assertion doesn't make any sense. Especially because module initialization will surely fail because of the name collision.

[ndossche]

Huh? Why did you change the name to "" though?

[kocsismate]

Mainly because I wanted to avoid this to work:

filter_var("qwe", FILTER_VALIDATE_URL, ["uri_parser_class" => "parse_url"])

even though null is the suggested value to use for the "uri_parser_class" config. As "" is the most similar string value to null that can be stored in a uri_handlers hash table, I figured it's a better choice than parse_url.

Or do you have any better solutions in mind?

[ndossche]

I think "" is weird from a user point of view.
I still don't think I quite understand the problem though.

[kocsismate]

I just found it weird that one can pass parse_url to use the legacy parser, while null is already dedicated for the purpose. Defaulting to null is convenient for the internal API: #19073 (comment).

Since "" is very close to null, I figured that it would be a better choice to use than an arbitrary name like parse_url. It's not really likely that users have to ever use this value (we should only document null), but I have to choose some string value for the name to be able to store the handler in the HashTable of the handlers. I could choose not to store it at all, and rather add an extra if to uri_handler_by_name (instead of php_uri_get_handler) for retrieving the legacy handler, but doing so would slightly slow down all usages, not just the ones that come outside of ext/uri.

I hope I managed to describe my problem 🤔 In any case, I don't have any hard feelings against each name, so I can live with any choice.

[ndossche]

So what if we want to change the default later or even drop parse_url?

[kocsismate]

Hmm.. so do you suggest that the implementation should have a name so that it can be referenced even if it's not the default one... I guess that makes sense... Thinking about it long-term, a phase-out will likely look like that some other implementation is made the default (likely RFC 3986), and then a few years later parse_url is removed... I guess I got your point now.

[ndossche]

I think this is getting pretty close to being merge-able

[ndossche]

Huh? Why did you change the name to "" though?

[ndossche]

Assertions with exceptions to the rule are a bit iffy IMHO

[kocsismate]

I'll fix the CI probably tomorrow night

[kocsismate]

I noticed that still the normalized URI components were retrieved in multiple places where the raw version would have made more sense, so I changed these.

Generally, I think the raw format should be used internally whenever possible. I am also considering to return an error if an unsupported format is required (e.g. the WHATWG implementation doesn't support normalization - except for the host whose unicode representation can be returned).

[kocsismate]

I realized that the php_raw_url_decode() is conformant to RFC 3986.

[ndossche]

Can you clarify what you mean with this remark/change?

[kocsismate]

Maybe you missed that initially, I used php_url_decode(). A bit later I realized that this function is not conformant to RFC 3986 URL ecoding (due to this line: https://github.com/php/php-src/blob/006730c0df454b29c7e6a0ac6b9149bfb179b1a9/ext/standard/url.c#L759), so I changed it to php_raw_url_decode which is conformant to it.

[ndossche]

I understand. (It's also a bit hard keeping track of changes in large PRs)
All fine then.

[kocsismate]

@nielsdos @TimWolla could you please have another look at this? I think it should really merge this soon.

[ndossche]

Please see my last question, otherwise looks fine to me. Let the cleanup begin.

[edorian]

RM wise: 👍

[DanielEScherzer]

Just out of curiosity and for planning, I seem to recall that the URI extension implementation was going to be split into multiple parts - is this the last part? Or are there more PRs to be expected (non-cleanup PRs that is)?

[DanielEScherzer]

ext/reflection changes look good to me

[kocsismate]

I've just rebased to latest master, added internal upgrading notes + news + renamed the uri_handler_register() PHPAPI function to use the regular naming convention (php_uri_handler_register). I'll merge this a bit later today.