Separate general purpose utils and protocol-related utils

src/protocol/Address.ts

@@ -0,0 +1,61 @@
+import type {UnsignedEvent} from 'nostr-tools'
+import {nip19} from 'nostr-tools'
+import {GROUP_DEFINITION, COMMUNITY_DEFINITION} from './Kinds'
+
+export type Address = {
+  kind: number,
+  pubkey: string
+  identifier: string
+  relays: string[]
+}
+
+// Plain text format
+
+export const decodeAddress = (a: string, relays: string[] = []): Address => {
+  const [kind, pubkey, identifier = ""] = a.split(":")
+
+  return {kind: parseInt(kind), pubkey, identifier, relays}
+}
+
+export const encodeAddress = (a: Address) => [a.kind, a.pubkey, a.identifier].join(":")
+
+// Naddr encoding
+
+export const addressFromNaddr = (naddr: string): Address => {
+  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 data
+}
+
+export const addressToNaddr = (a: Address): string => nip19.naddrEncode(a)
+
+// Get from event, encode to filter
+
+export const getIdentifier = (e: UnsignedEvent) => e.tags.find(t => t[0] === "d")?.[1] || ""
+
+export const addressFromEvent = (e: UnsignedEvent, relays: string[] = []) =>
+  ({kind: e.kind, pubkey: e.pubkey, identifier: getIdentifier(e), relays})
+
+export const addressToFilter = (a: Address) =>
+  ({kinds: [a.kind], authors: [a.pubkey], "#d": [a.identifier]})
+
+// Utils
+
+export const isGroupAddress = (a: Address) => a.kind === GROUP_DEFINITION
+
+export const isCommunityAddress = (a: Address) => a.kind === COMMUNITY_DEFINITION
+
+export const isContextAddress = (a: Address) => [GROUP_DEFINITION, COMMUNITY_DEFINITION].includes(a.kind)