Implement NIP-04: Encrypted Direct Messages

README.md

@@ -20,6 +20,7 @@ has not yet reached a stable release. Use with caution.
   * [Stop previous subscriptions](#stop-previous-subscriptions)
   * [Publishing an event](#publishing-an-event)
   * [Creating/updating your contact list](#creatingupdating-your-contact-list)
+  * [Sending an encrypted direct message](#sending-an-encrypted-direct-message)
 - [Implemented NIPs](#implemented-nips)
 - [Development](#development)
   * [Type checking](#type-checking)
@@ -240,6 +241,33 @@ update_contacts_event = user.create_event(
 client.publish(update_contacts_event)
 ```
 
+### Sending an encrypted direct message
+
+```ruby
+sender_private_key = '3185a47e3802f956ca5a2b4ea606c1d51c7610f239617e8f0f218d55bdf2b757'
+
+encrypted_direct_message = Nostr::Events::EncryptedDirectMessage.new(
+   sender_private_key: sender_private_key,
+   recipient_public_key: '6c31422248998e300a1a457167565da7d15d0da96651296ee2791c29c11b6aa0',
+   plain_text: 'Your feedback is appreciated, now pay $8',
+   previous_direct_message: 'ccf9fdf3e1466d7c20969c71ec98defcf5f54aee088513e1b73ccb7bd770d460' # optional
+)
+
+encrypted_direct_message.sign(sender_private_key)
+
+# #<Nostr::Events::EncryptedDirectMessage:0x0000000104c9fa68
+# @content="mjIFNo1sSP3KROE6QqhWnPSGAZRCuK7Np9X+88HSVSwwtFyiZ35msmEVoFgRpKx4?iv=YckChfS2oWCGpMt1uQ4GbQ==",
+#   @created_at=1676456512,
+#   @id="daac98826d5eb29f7c013b6160986c4baf4fe6d4b995df67c1b480fab1839a9b",
+#   @kind=4,
+#   @pubkey="8a9d69c56e3c691bec8f9565e4dcbe38ae1d88fffeec3ce66b9f47558a3aa8ca",
+#   @sig="028bb5f5bab0396e2065000c84a4bcce99e68b1a79bb1b91a84311546f49c5b67570b48d4a328a1827e7a8419d74451347d4f55011a196e71edab31aa3d6bdac",
+#   @tags=[["p", "6c31422248998e300a1a457167565da7d15d0da96651296ee2791c29c11b6aa0"], ["e", "ccf9fdf3e1466d7c20969c71ec98defcf5f54aee088513e1b73ccb7bd770d460"]]>
+
+# Send it to the Relay
+client.publish(encrypted_direct_message)
+````
+
 ## Implemented NIPs
 
 - [x] [NIP-01 - Client](https://github.com/nostr-protocol/nips/blob/master/01.md)