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Extract categories as a structured array in the metadata endpoint
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We should pull out categories of a page into an array as part of the new /page/metadata/{title} endpoint.

If we can use a MW API for this, we can make a call directly. Otherwise we should parse the HTML to get at these.

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Please no... categories should remain out of the payload of the MCS endpoint. In mobile we only need to show them with a categories button. The HTML for categories can be quite large and is not necessary for an initial view and arguably not needed even for a below the fold view. I'd recommend the creation of a new endpoint for categories if needed for scalability...

Is anything needed here beyond a simple list of categories?

It would be trivially easy to get these directly from the Parsoid HTML with something like

const categoryLinks = doc.querySelectorAll('link[rel="mw:PageProp/Category"]');
return [], link => link.getAttribute('href'));

Interesting. Parsoid HTML currently doesn't expose hidden categories. I wonder how @ssastry would feel about adding those.

Change 410627 had a related patch set uploaded (by Mholloway; owner: Mholloway):
[mediawiki/services/mobileapps@master] Metadata: Add page categories

Doing this from the MW API for now so we're not blocked on T186919.

bearND renamed this task from Extract categories as a structured array to Extract categories as a structured array in the metadata endpoint.Feb 15 2018, 3:56 AM
bearND updated the task description. (Show Details)

Updated title and description of this task to reflect the current plan.

Change 410627 merged by Mholloway:
[mediawiki/services/mobileapps@master] Metadata: Add page categories