Add domain package

packages/domain/src/list.ts

@@ -0,0 +1,45 @@
+import {parseJson} from "@welshman/lib"
+import {Address, isShareableRelayUrl, TrustedEvent} from "@welshman/util"
+import {Encryptable, DecryptedEvent} from "./util"
+
+export type ListParams = {
+  kind: number
+}
+
+export type List<E extends TrustedEvent> = ListParams & {
+  publicTags: string[][]
+  privateTags: string[][]
+  event?: DecryptedEvent<E>
+}
+
+export type PublishedList<E extends TrustedEvent> = Omit<List<E>, "event"> & {
+  event: DecryptedEvent<E>
+}
+
+export const makeList = <E extends TrustedEvent>(list: ListParams & Partial<List<E>>): List<E> =>
+  ({publicTags: [], privateTags: [], ...list})
+
+const isValidTag = (tag: string[]) => {
+  if (tag[0] === "p") return tag[1]?.length === 64
+  if (tag[0] === "e") return tag[1]?.length === 64
+  if (tag[0] === "a") return Address.isAddress(tag[1] || "")
+  if (tag[0] === "t") return tag[1]?.length > 0
+  if (tag[0] === "r") return isShareableRelayUrl(tag[1])
+  if (tag[0] === "relay") return isShareableRelayUrl(tag[1])
+
+  return true
+}
+
+export const readList = <E extends TrustedEvent>(event: DecryptedEvent<E>): PublishedList<E> => {
+  const getTags = (tags: string[][]) => (Array.isArray(tags) ? tags.filter(isValidTag) : [])
+  const privateTags = getTags(parseJson(event.plaintext?.content))
+  const publicTags = getTags(event.tags)
+
+  return {event, kind: event.kind, publicTags, privateTags}
+}
+
+export const createList = <E extends TrustedEvent>({kind, publicTags = [], privateTags = []}: List<E>) =>
+  new Encryptable({kind, tags: publicTags}, {content: JSON.stringify(privateTags)})
+
+export const editList = <E extends TrustedEvent>({kind, publicTags = [], privateTags = []}: PublishedList<E>) =>
+  new Encryptable({kind, tags: publicTags}, {content: JSON.stringify(privateTags)})