Channels: Add role / default permission set routes.

Server: Add role create / delete route.

src/routes/servers/roles_create.rs

@@ -0,0 +1,75 @@
+use crate::database::*;
+use crate::notifications::events::ClientboundNotification;
+use crate::util::result::{Error, Result};
+
+use ulid::Ulid;
+use mongodb::bson::doc;
+use validator::Validate;
+use serde::{Serialize, Deserialize};
+use rocket_contrib::json::{Json, JsonValue};
+
+#[derive(Validate, Serialize, Deserialize)]
+pub struct Data {
+    #[validate(length(min = 1, max = 32))]
+    name: String
+}
+
+#[post("/<target>/roles", data = "<data>")]
+pub async fn req(user: User, target: Ref, data: Json<Data>) -> Result<JsonValue> {
+    let data = data.into_inner();
+    data.validate()
+        .map_err(|error| Error::FailedValidation { error })?;
+    
+    let target = target.fetch_server().await?;
+
+    let perm = permissions::PermissionCalculator::new(&user)
+        .with_server(&target)
+        .for_server()
+        .await?;
+
+    if !perm.get_manage_roles() {
+        Err(Error::MissingPermission)?
+    }
+
+    let id = Ulid::new().to_string();
+    let perm_tuple = (
+        *permissions::server::DEFAULT_PERMISSION as i32,
+        *permissions::channel::DEFAULT_PERMISSION_SERVER as i32
+    );
+
+    get_collection("servers")
+        .update_one(
+            doc! {
+                "_id": &id
+            },
+            doc! {
+                "$set": {
+                    "roles.".to_owned() + &id: {
+                        "name": &data.name,
+                        "permissions": [
+                            &perm_tuple.0,
+                            &perm_tuple.1
+                        ]
+                    } 
+                }
+            },
+            None
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "update_one",
+            with: "servers"
+        })?;
+    
+    ClientboundNotification::ServerRoleUpdate {
+        id: target.id.clone(),
+        role_id: id.clone(),
+        data: json!({
+            "name": data.name,
+            "permissions": &perm_tuple
+        })
+    }
+    .publish(target.id);
+
+    Ok(json!({ "id": id, "permissions": perm_tuple }))
+}