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Use "parse a MIME type" to check validity. #105

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Use "parse a MIME type" to check validity. #105

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Use "parse a MIME type" to check validity.
chcunningham Oct 29, 2018
f3404a7
Merge branch 'main' into mimeSniff
chrisn Feb 12, 2024
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48 changes: 42 additions & 6 deletions index.bs
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Expand Up @@ -206,12 +206,48 @@ spec: webidl; urlPrefix: https://heycam.github.io/webidl/#
<h4 id='mime-type'>MIME types</h4>

<p>
In the context of this specification, a MIME type is also called content
type. A <dfn>valid media MIME type</dfn> is a string that is a <a>valid
MIME type</a> per [[mimesniff]]. If the MIME type does not imply a
codec, the string MUST also have one and only one parameter that is
named <code>codecs</code> with a value describing a single media codec.
Otherwise, it MUST contain no parameters.
To check if a string <var>mimeString</var> is a <dfn>valid media MIME
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This should be named something else more specific for this specification, to avoid confusion with the one from the MIME Sniff spec.

type</dfn>, the following steps MUST be run:
<ul>
<li>
Let <var>parsedMime</var> be the result of running the <a>parse a
MIME type</a> [[mimesniff]] algorithm with <var>mimeString</var>.
</li>
<li>
If the value of <var>parsedMime</var> is <code>failure</code>,
return <code>false</code> and abort these steps.
</li>
<li>
If the combined <code>type</code> and <code>subtype</code> members
of <var>parsedMime</var> imply a single media codec, run these
substeps:
<ul>
<li>
If the <code>parameters</code> member of <var>parsedMime</var>
is not empty, return <code>false</code> and abort these steps.
</li>
<li>Otherwise, return <code>true</code>.</li>
</ul>
</li>
<li>
Otherwise run the following substeps:
<ul>
<li>
If the <code>parameters</code> member of <var>parsedMime</var>
does not contain a single key named "codecs", return
<code>false</code> and abort these steps.
</li>
<li>
If the value of <code>parsedMime.parameters["codecs"]</code>
does not describe a single media codec, return
<code>false</code> and abort these steps.
</li>
<li>
Otherwise, return true.
</li>
</ul>
</li>
</ul>
</p>

<p>
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