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NIP-25
======
Reactions
---------
`draft` `optional` `author:jb55`
A reaction is a `kind 7` note that is used to react to other notes.
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 tallys.
The `content` MAY be an emoji, in this case it MAY be interpreted as a "like" or "dislike",
or the client MAY display this emoji reaction on the post.
Tags
----
The reaction event SHOULD include `e` and `p` tags from the note the user is
reacting to. This allows users to be notified of reactions to posts they were
mentioned in. Including the `e` tags enables clients to pull all the reactions
associated with individual posts or all the posts in a thread.
The last `e` tag MUST be the `id` of the note that is being reacted to.
The last `p` tag MUST be the `pubkey` of the event being reacted to.
Example code
```swift
func make_like_event(pubkey: String, privkey: String, liked: NostrEvent) -> NostrEvent {
var tags: [[String]] = liked.tags.filter {
tag in tag.count >= 2 && (tag[0] == "e" || tag[0] == "p")
}
tags.append(["e", liked.id])
tags.append(["p", liked.pubkey])
let ev = NostrEvent(content: "+", pubkey: pubkey, kind: 7, tags: tags)
ev.calculate_id()
ev.sign(privkey: privkey)
return ev
}
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