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Clarify the initiator steps #714

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Clarify the initiator steps #714

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4e76ee2
Update initiator algorithms
OrKoN May 21, 2024
41c1632
Is parser-inserted metadata close enough?
OrKoN May 24, 2024
a524f96
initiator steps
OrKoN Jun 13, 2024
080afc9
Update index.bs
OrKoN Jun 27, 2024
c3024c7
Update index.bs
OrKoN Jun 27, 2024
1ff00d4
Update index.bs
OrKoN Jun 27, 2024
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58 changes: 36 additions & 22 deletions index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -212,6 +212,7 @@ spec: HTML; urlPrefix: https://html.spec.whatwg.org/multipage/
text: prompt; url: timers-and-user-prompts.html#dom-prompt
text: remove a browsing context; url: browsers.html#bcg-remove
text: report an error; url: webappapis.html#report-the-error
text: resource; url: infrastructure.html#resources
text: run the animation frame callbacks; url: imagebitmap-and-animations.html#run-the-animation-frame-callbacks
text: same origin domain; url: browsers.html#same-origin-domain
text: select an image source from a source set; url: images.html#select-an-image-source-from-a-source-set
Expand Down Expand Up @@ -5260,51 +5261,64 @@ network.Initiator = {
type: "parser" / "script" / "preflight" / "other",
? columnNumber: js-uint,
? lineNumber: js-uint,
? url: text,
? stackTrace: script.StackTrace,
? request: network.Request
};
</pre>

The <code>network.Initiatior</code> type represents the source of a network
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request.

Note: the purpose of initiator is to allow finding out which resource
initiated a particular request.

<div algorithm>
To <dfn>get the initiator</dfn> given |request|:

1. Let |request id| be |request|'s [=request id=].

1. Let |type| be "<code>other</code>".

1. Let |stack trace|, |url|, |column number|, and |line number| all be null.

1. If |request| is a [=CORS-Preflight Request=], set |type| to
"<code>preflight</code>".

1. TODO: Get the |type|. It's not quite clear how this ought to work; the CDP
data depends on whether the navigation was kicked off by the parser or by
script (so e.g. inserting an image from script causes the initiator to be
"<code>script</code>"), but that doesn't correspond to anything in Fetch.
1. Otherwise, if |request|'s [=request/initiator type=] is "<code>script</code>"
and |request| is [=isTopLevel=], set |type| to "<code>parser</code>".

1. Otherwise, if |request|'s [=request/initiator type=] is "<code>script</code>"
and |request| is not [=isTopLevel=], set |type| to "<code>script</code>".

1. Otherwise, if |request|'s [=request/initiator type=] is "<code>css</code>",
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It's not clear to me if this is correct given e.g. @import rules (I don't know how CDP behaves)

set |type| to "<code>parser</code>".

TODO: probably some other initiator types should be treated as "parser".

1. If |request|'s [=request/referrer=] is a URL,
set |url| to |request|'s [=request/referrer=] otherwise set |url| to |request|'s document URL;

1. If |request|'s [=request/initiator type=] is "<code>fetch</code>" or
"<code>xmlhttprequest</code>":

1. Let |stack trace| be the [=current stack trace=].
1. Set |stack trace| to the [=current stack trace=].

1. Otherwise, if |type| is "<code>script</code>" and [=current stack trace=] is available to the implementation:

1. Set |stack trace| to the [=current stack trace=].

1. If |stack trace| has size of 1 or greater, let |line number| be value of the
<code>lineNumber</code> field in |stack trace|[0], and let |column number| be
the value of the <code>columnNumber</code> field in |stack trace|[0]. Otherwise
let |line number| and |column number| be 0.
1. Otherwise, if |type| is "<code>parser</code>" and implementation-defined parser state is available:

Otherwise, let |stack trace|, |column number|, and |line number| all be null.
1. Set |line number| to be zero-based parser line position in the resource that initiated the |request|.

TODO: Chrome includes the current parser position as column number / line
number for parser-inserted resources.
1. Set |column number| to be zero-based parser column position in the resource that initiated the |request|.

1. Return a [=/map=] matching the <code>network.Initiator</code> production, with
the <code>type</code> field set to |type|, the <code>columnNumber</code>
field set to |column number| if it's not null, or omitted otherwise, the
<code>lineNumber</code> field set to |line number| if it's not null, or
omitted otherwise, the <code>stackTrace</code> field set to |stack trace| if
it's not null, or omitted otherwise, and the <code>request</code> field set
to |request id|.
1. Return a [=/map=] matching the <code>network.Initiator</code>
production, with the <code>type</code> field set to |type|, the
<code>columnNumber</code> field set to |column number| if it's not
null, or omitted otherwise, the <code>lineNumber</code> field set to
|line number| if it's not null, or omitted otherwise, the
<code>stackTrace</code> field set to |stack trace| if it's not null,
or omitted otherwise, and the <code>url</code> field set to |url| if
it's not null, or omitted otherwise.

</div>

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