Add app package

packages/app/src/plaintext.ts

@@ -0,0 +1,25 @@
+import {writable} from 'svelte/store'
+import {assoc} from '@welshman/lib'
+import type {TrustedEvent} from '@welshman/util'
+import {withGetter} from '@welshman/store'
+import {decrypt} from "@welshman/signer"
+import {getSigner, getSession} from './session'
+
+export const plaintext = withGetter(writable<Record<string, string>>({}))
+
+export const getPlaintext = (e: TrustedEvent) => plaintext.get()[e.id]
+
+export const setPlaintext = (e: TrustedEvent, content: string) =>
+  plaintext.update(assoc(e.id, content))
+
+export const ensurePlaintext = async (e: TrustedEvent) => {
+  if (e.content && !getPlaintext(e)) {
+    const $signer = getSigner(getSession(e.pubkey))
+
+    if ($signer) {
+      setPlaintext(e, await decrypt($signer, e.pubkey, e.content))
+    }
+  }
+
+  return getPlaintext(e)
+}