NAME

activitypub — notes about the honk implementation

DESCRIPTION

The honk(1) utility processes status updates and other microblog activities using the ActivityPub protocol to exchange messages with other servers. The specification is subject to interpretation, and not all implementations behave in the same way. This document attempts to clarify honk's behavior. It is not intended to be a complete description of ActivityPub, but may be useful as a guide to other implementors looking to interoperate.

OBJECTS

The following object or document types are supported.

Note: Fully supported. The default object type for honk.
Article: Fully supported.
Page: Supported.
Question: Read only support. Appears similar to a Note.
Event: Supported. Appears similar to a Note. Can be both created and received, but Invite activities are ignored.
Video: Limited support.
Audio: Limited Support.

Honk primarily supports HTML content, not markdown or other formats, with a wide range of permitted HTML tags in object content fields. The following tags are supported.

a, img, span,
div, h1, h2, h3, h4, h5, h6, hr,
table, thead, tbody, tfoot, th, tr, td, colgroup, col,
p, br, pre, code, blockquote, q,
caption, kbd, time, wbr, aside,
ruby, rtc, rb, rt, details, summary,
samp, mark, ins, dfn, cite, abbr, address,
strong, em, b, i, s, u, sub, sup, del, tt, small,
ol, ul, li, dl, dt, dd

The following tag attributes are permitted.

href, src, alt, colspan, rowspan

The following class names are used for syntax highlighting code blocks.

kw, bi, st, nm, tp, op, cm, al, dl

ACTIVITIES

The following activities are supported.

Create: Fully supported.
Announce: Supported with share semantics.
Read: Supported. Primarily used to acknowledge replies and complete threads. Can be interpreted to mean reply is approved, if not endorsed.
Add: Works with collections.
Follow: Supported. Can follow both actors and collections. Accept and Undo require that the original request be quoted, not referred to by URI.
Update: Supported. Honk sends and receives Update activities.
Delete: Does what it can.
Like: Don't be ridiculous.

METADATA

The following additional object types are supported, typically as tag or attachment.

Mention: Pretty @ machine.
Emoji: Inline text :emoji: with image replacement.
Place: Included as a location. Supports name, url, latitude, and longitude.
Document: Plain text and images in jpeg, gif, png, and webp formats are supported. Other formats are linked to origin.