Implement reactions

Co-Authored-By: bjoern <r10s@b44t.com>
Co-Authored-By: Simon Laux <mobile.info@simonlaux.de>

deltachat-jsonrpc/src/api/mod.rs

@@ -17,6 +17,7 @@ use deltachat::{
     provider::get_provider_info,
     qr,
     qr_code_generator::get_securejoin_qr_svg,
+    reaction::send_reaction,
     securejoin,
     stock_str::StockMessage,
     webxdc::StatusUpdateSerial,
@@ -1466,6 +1467,23 @@ impl CommandApi {
         Ok(message_id.to_u32())
     }
 
+    /// Send a reaction to message.
+    ///
+    /// Reaction is a string of emojis separated by spaces. Reaction to a
+    /// single message can be sent multiple times. The last reaction
+    /// received overrides all previously received reactions. It is
+    /// possible to remove all reactions by sending an empty string.
+    async fn send_reaction(
+        &self,
+        account_id: u32,
+        message_id: u32,
+        reaction: Vec<String>,
+    ) -> Result<u32> {
+        let ctx = self.get_context(account_id).await?;
+        let message_id = send_reaction(&ctx, MsgId::new(message_id), &reaction.join(" ")).await?;
+        Ok(message_id.to_u32())
+    }
+
     // ---------------------------------------------
     //           functions for the composer
     //    the composer is the message input field