Add fetch owned, public and specific bots for #8.

src/routes/bots/fetch_public.rs

@@ -0,0 +1,24 @@
+use crate::database::*;
+use crate::util::result::{Error, Result};
+
+use serde_json::Value;
+
+#[get("/<target>/invite")]
+pub async fn fetch_public_bot(user: User, target: Ref) -> Result<Value> {
+    let bot = target.fetch_bot().await?;
+
+    if !bot.public {
+        if bot.owner != user.id {
+            return Err(Error::BotIsPrivate);
+        }
+    }
+
+    let user = Ref::from_unchecked(bot.id.clone()).fetch_user().await?;
+
+    Ok(json!({
+        "_id": bot.id,
+        "username": user.username,
+        "avatar": user.avatar,
+        "description": user.profile.map(|p| p.content)
+    }))
+}