[wp-trac] [WordPress Trac] #47420: Block markup containing HTML in block attributes is corrupted when using wp_insert_post

[WordPress Trac]

#47420: Block markup containing HTML in block attributes is corrupted when using
wp_insert_post
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 Reporter:  modernnerd    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  2nd-opinion   |     Focuses:
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Comment (by jeremyfelt):

 Replying to [comment:2 modernnerd]:
 > It seems that HTML in block attributes is already encoded by WordPress.
 At least, I see content like this stored in the database already as part
 of the post content:
 >
 > {{{
 > {"title":"\u003cstrong\u003ePackage
 #1\u003c/strong\u003e","fontSize":"larger","paddingTop":30}
 > }}}

 Exactly. Client side JavaScript in Gutenberg does
 [https://github.com/WordPress/gutenberg/blob/774713c0467779a9651983ec96609a6637811132/packages/blocks/src/api/serializer.js#L172-L195
 some additional work] beyond `JSON.stringify()` to encode the data before
 it is sent to the server for storage.

 > Are you suggesting that these attributes need to be handled differently
 by the block developer, or that anyone wanting to import such content via
 wp_insert_post() needs to somehow first decode block attributes that could
 contain HTML?

 Anything processed in PHP should effectively mimic what is done in
 JavaScript. So - if the block developer is encoding on the client side,
 they can use Gutenberg's `serializeAttributes()` (or something like it).
 But if they're encoding on the server side, they'll likely need to pass
 additional flags to `wp_json_encode()` so that those additional characters
 are encoded properly.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47420#comment:3>
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