Servers: Add route for creating channels.

Notifications: Subscribe to guild channels.

src/routes/servers/channel_create.rs

@@ -0,0 +1,85 @@
+use crate::database::*;
+use crate::util::result::{Error, Result};
+
+use mongodb::bson::doc;
+use rocket_contrib::json::{Json, JsonValue};
+use serde::{Deserialize, Serialize};
+use ulid::Ulid;
+use validator::Validate;
+
+#[derive(Validate, Serialize, Deserialize)]
+pub struct Data {
+    #[validate(length(min = 1, max = 32))]
+    name: String,
+    #[validate(length(min = 0, max = 1024))]
+    description: Option<String>,
+    // Maximum length of 36 allows both ULIDs and UUIDs.
+    #[validate(length(min = 1, max = 36))]
+    nonce: String,
+}
+
+#[post("/<target>/channels", data = "<info>")]
+pub async fn req(user: User, target: Ref, info: Json<Data>) -> Result<JsonValue> {
+    let info = info.into_inner();
+    info.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_server() {
+        Err(Error::MissingPermission)?
+    }
+
+    if get_collection("channels")
+        .find_one(
+            doc! {
+                "nonce": &info.nonce
+            },
+            None,
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "find_one",
+            with: "channel",
+        })?
+        .is_some()
+    {
+        Err(Error::DuplicateNonce)?
+    }
+
+    let id = Ulid::new().to_string();
+    let channel = Channel::TextChannel {
+        id: id.clone(),
+        server: target.id.clone(),
+        nonce: Some(info.nonce),
+
+        name: info.name,
+        description: info.description,
+        icon: None,
+    };
+
+    channel.clone().publish().await?;
+    get_collection("servers")
+        .update_one(
+            doc! {
+                "_id": target.id
+            },
+            doc! {
+                "$addToSet": {
+                    "channels": id
+                }
+            },
+            None
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "update_one",
+            with: "server",
+        })?;
+
+    Ok(json!(channel))
+}