Store contact PGP publicKey in browser storage

app/soapbox/reducers/chat_messages.ts

@@ -11,6 +11,7 @@ import {
 } from 'soapbox/actions/chats';
 import { STREAMING_CHAT_UPDATE } from 'soapbox/actions/streaming';
 import { normalizeChatMessage } from 'soapbox/normalizers';
+import { isPgpPublicKeyMessage, savePgpKey } from 'soapbox/utils/pgp';
 
 import type { AnyAction } from 'redux';
 
@@ -21,7 +22,14 @@ type APIEntities = Array<APIEntity>;
 type State = ImmutableMap<string, ChatMessageRecord>;
 
 const importMessage = (state: State, message: APIEntity) => {
-  return state.set(message.id, normalizeChatMessage(message));
+  const normalMessage = normalizeChatMessage(message);
+
+  if (isPgpPublicKeyMessage(normalMessage.content)) {
+    // FIXME: use account fqn instead of account_id
+    savePgpKey(normalMessage.account_id, normalMessage.content);
+  }
+
+  return state.set(normalMessage.id, normalMessage);
 };
 
 const importMessages = (state: State, messages: APIEntities) =>

app/soapbox/utils/pgp.ts

@@ -10,6 +10,11 @@ const isPgpMessage = (message: string): boolean => {
   return /^-----BEGIN PGP [A-Z ]+-----/.test(message);
 };
 
+/** Check whether a message contains a PGP public key. */
+const isPgpPublicKeyMessage = (message: string): boolean => {
+  return /^-----BEGIN PGP PUBLIC KEY BLOCK-----/.test(message);
+};
+
 /** Generate a key and store it in the browser, if one doesn't already exist. */
 const initPgpKey = async(fqn: string) => {
   const item = await KVStore.getItem(`pgp:${fqn}`);
@@ -22,7 +27,14 @@ const initPgpKey = async(fqn: string) => {
   }
 };
 
+/** Store the public key of another user. */
+const savePgpKey = async(fqn: string, publicKey: string) => {
+  return await KVStore.setItem(`pgp:${fqn}`, { publicKey });
+};
+
 export {
   isPgpMessage,
+  isPgpPublicKeyMessage,
   initPgpKey,
+  savePgpKey,
 };