re work tags again

src/util/Address.ts

@@ -0,0 +1,82 @@
+import type {UnsignedEvent} from 'nostr-tools'
+import {nip19} from 'nostr-tools'
+import {GROUP_DEFINITION, COMMUNITY_DEFINITION} from './Kinds'
+import {Tags} from './Tags'
+
+export const isGroupAddress = (a: string) => a.startsWith(`${GROUP_DEFINITION}:`)
+
+export const isCommunityAddress = (a: string) => a.startsWith(`${COMMUNITY_DEFINITION}:`)
+
+export const isCommunityOrGroupAddress = (a: string) => isCommunityAddress(a) || isGroupAddress(a)
+
+export class Address {
+  readonly kind: number
+
+  constructor(
+    kind: string | number,
+    readonly pubkey: string,
+    readonly identifier: string,
+    readonly relays: string[],
+  ) {
+    this.kind = parseInt(kind as string)
+    this.identifier = identifier || ""
+  }
+
+  static fromEvent = (e: UnsignedEvent, relays: string[] = []) =>
+    new Address(e.kind, e.pubkey, Tags.fromEvent(e).whereKey("d").values().first(), relays)
+
+  static fromTagValue = (a: string, relays: string[] = []) => {
+    const [kind, pubkey, identifier] = a.split(":")
+
+    return new Address(kind, pubkey, identifier, relays)
+  }
+
+  static fromTag = (tag: string[], relays: string[] = []) => {
+    const [a, hint] = tag.slice(1)
+
+    if (hint) {
+      relays = relays.concat(hint)
+    }
+
+    return this.fromTagValue(a, relays)
+  }
+
+  static fromNaddr = (naddr: string) => {
+    let type
+    let data = {} as any
+    try {
+      ({type, data} = nip19.decode(naddr) as {
+        type: "naddr"
+        data: any
+      })
+    } catch (e) {
+      // pass
+    }
+
+    if (type !== "naddr") {
+      throw new Error(`Invalid naddr ${naddr}`)
+    }
+
+    return new Address(data.kind, data.pubkey, data.identifier, data.relays)
+  }
+
+  asTagValue = () => [this.kind, this.pubkey, this.identifier].join(":")
+
+  asTag = (mark?: string) => {
+    const tag = ["a", this.asTagValue(), this.relays[0] || ""]
+
+    if (mark) {
+      tag.push(mark)
+    }
+
+    return tag
+  }
+
+  asNaddr = () => nip19.naddrEncode(this)
+
+  asFilter = () => ({
+    kinds: [this.kind],
+    authors: [this.pubkey],
+    "#d": [this.identifier],
+  })
+}