New Feature: Settings sync to server.

src/routes/sync/get_settings.rs

@@ -0,0 +1,40 @@
+use crate::database::*;
+use crate::util::result::{Error, Result};
+
+use mongodb::bson::doc;
+use serde::{Deserialize, Serialize};
+use mongodb::options::FindOneOptions;
+use rocket_contrib::json::{Json, JsonValue};
+
+#[derive(Serialize, Deserialize)]
+pub struct Options {
+    keys: Vec<String>
+}
+
+#[post("/settings/fetch", data = "<options>")]
+pub async fn req(user: User, options: Json<Options>) -> Result<JsonValue> {
+    let options = options.into_inner();
+    let mut projection = doc! {
+        "_id": 0,
+    };
+
+    for key in options.keys {
+        projection.insert(key, 1);
+    }
+
+    if let Some(doc) = get_collection("user_settings")
+        .find_one(
+            doc! {
+                "_id": user.id
+            },
+            FindOneOptions::builder()
+                .projection(projection)
+                .build()
+        )
+        .await
+        .map_err(|_| Error::DatabaseError { operation: "find_one", with: "user_settings" })? {
+        Ok(json!(doc))
+    } else {
+        Ok(json!({ }))
+    }
+}