draft optional
A reaction is a kind 7 event that is used to react to other events.
The generic reaction, represented by the content set to a + string, SHOULD
be interpreted as a "like" or "upvote".
A reaction with content set to - SHOULD be interpreted as a "dislike" or
"downvote". It SHOULD NOT be counted as a "like", and MAY be displayed as a
downvote or dislike on a post. A client MAY also choose to tally likes against
dislikes in a reddit-like system of upvotes and downvotes, or display them as
separate tallies.
The content MAY be an emoji, or NIP-30 custom emoji in this case it MAY be interpreted as a "like" or "dislike",
or the client MAY display this emoji reaction on the post. If the content is an empty string then the client should
consider it a "+".
The reaction event SHOULD include a, e and p tags pointing to the note the user is
reacting to. The p tag allows authors to be notified. The e tags enables clients
to pull all the reactions to individual events and a tags enables clients to seek reactions
for all versions of a replaceable event.
The e tag MUST be the id of the note that is being reacted to.
The a tag MUST contain the coordinates (kind:pubkey:d-tag) of the replaceable being reacted to.
The p tag MUST be the pubkey of the event being reacted to.
The reaction event MAY include a k tag with the stringified kind number
of the reacted event as its value.
Example code
func make_like_event(pubkey: String, privkey: String, liked: NostrEvent) -> NostrEvent {
tags.append(["e", liked.id])
tags.append(["p", liked.pubkey])
tags.append(["k", liked.kind])
let ev = NostrEvent(content: "+", pubkey: pubkey, kind: 7, tags: tags)
ev.calculate_id()
ev.sign(privkey: privkey)
return ev
}The client may specify a custom emoji (NIP-30) :shortcode: in the
reaction content. The client should refer to the emoji tag and render the
content as an emoji if shortcode is specified.
{
"kind": 7,
"content": ":soapbox:",
"tags": [
["emoji", "soapbox", "https://gleasonator.com/emoji/Gleasonator/soapbox.png"]
],
"pubkey": "79c2cae114ea28a981e7559b4fe7854a473521a8d22a66bbab9fa248eb820ff6",
"created_at": 1682790000
}The content can be set only one :shortcode:. And emoji tag should be one.