Add method to fetch messages

Co-authored-by: Elias Schriefer

src/graphql.rs

@@ -601,8 +601,36 @@ impl Query {
 
         Ok(chats)
     }
-}
 
+    async fn getMessages(context: &Context, user: ID, password_hash: String, chat: ID, last_msg: Option<ID>) -> FieldResult<Vec<Message>> {
+        let user = id_to_uuid(&user)?.to_simple();
+        user_authentication(&context.db, &user, &password_hash).await?;
+
+        let mut messages = Vec::new();
+        for message in sqlx::query(format!(
+            r#"SELECT * FROM msgdata_{} SORT BY timestamp DESCENDING"#,
+            chat,
+        ).as_str()).fetch_all(&context.db).await? {
+            messages.push(Message {
+                id: ID::from(message.try_get::<String, _>("id")?),
+                timestamp: message.try_get::<i64, _>("timestamp")?.try_into()?,
+                sender: message.try_get::<String, _>("sender_id")?.into(),
+                msg_type: message.try_get::<u8,_>("msg_type")?.try_into()?,
+                content: message.try_get("content")?,
+                hide_for: message.try_get("hide_for")?
+                    .map(|array| from_sql_formatted_array(array, "hide_for"))
+                    .transpose()?
+                    .map(|u: String| u.into())
+                    .collect(),
+                seen_by: from_sql_formatted_array(message.try_get("seen_by")?, "seen_by")?
+                    .map(|s| s.into())
+                    .collect(),
+            });
+        }
+
+        Ok(messages)
+    }
+}
 #[derive(Clone, Copy, Debug)]
 pub struct Mutation;