feat: add discriminator and display name fields

crates/core/database/src/models/admin_migrations/ops/mongodb/init.rs

@@ -44,6 +44,10 @@ pub async fn create_database(db: &MongoDb) {
         .await
         .expect("Failed to create channel_unreads collection.");
 
+    db.create_collection("channel_webhooks", None)
+        .await
+        .expect("Failed to create channel_webhooks collection.");
+
     db.create_collection("migrations", None)
         .await
         .expect("Failed to create migrations collection.");
@@ -91,6 +95,18 @@ pub async fn create_database(db: &MongoDb) {
                         "username": 1_i32
                     },
                     "name": "username",
+                    "unique": false,
+                    "collation": {
+                        "locale": "en",
+                        "strength": 2_i32
+                    }
+                },
+                {
+                    "key": {
+                        "username": 1_i32,
+                        "discriminator": 1_i32
+                    },
+                    "name": "username_discriminator",
                     "unique": true,
                     "collation": {
                         "locale": "en",

crates/core/database/src/models/admin_migrations/ops/mongodb/scripts.rs

@@ -16,7 +16,7 @@ struct MigrationInfo {
     revision: i32,
 }
 
-pub const LATEST_REVISION: i32 = 23;
+pub const LATEST_REVISION: i32 = 24;
 
 pub async fn migrate_database(db: &MongoDb) {
     let migrations = db.col::<Document>("migrations");
@@ -768,6 +768,61 @@ pub async fn run_migrations(db: &MongoDb, revision: i32) -> i32 {
             .expect("Failed to update server members.");
     }
 
+    if revision <= 23 {
+        info!("Running migration [revision 23 / 09-06-2023]: Add collection `channel_webhooks` if not exists, update users index.");
+
+        db.db()
+            .create_collection("channel_webhooks", None)
+            .await
+            .ok();
+
+        db.db()
+            .run_command(
+                doc! {
+                    "dropIndexes": "users",
+                    "indexes": "username"
+                },
+                None,
+            )
+            .await
+            .expect("Failed to drop existing username index.");
+
+        db.db()
+            .run_command(
+                doc! {
+                    "createIndexes": "users",
+                    "indexes": [
+                        {
+                            "key": {
+                                "username": 1_i32
+                            },
+                            "name": "username",
+                            "unique": false,
+                            "collation": {
+                                "locale": "en",
+                                "strength": 2_i32
+                            }
+                        },
+                        {
+                            "key": {
+                                "username": 1_i32,
+                                "discriminator": 1_i32
+                            },
+                            "name": "username_discriminator",
+                            "unique": true,
+                            "collation": {
+                                "locale": "en",
+                                "strength": 2_i32
+                            }
+                        }
+                    ]
+                },
+                None,
+            )
+            .await
+            .expect("Failed to create username index.");
+    }
+
     // Need to migrate fields on attachments, change `user_id`, `object_id`, etc to `parent`.
 
     // Reminder to update LATEST_REVISION when adding new migrations.

crates/core/database/src/models/users/model.rs

@@ -10,6 +10,10 @@ auto_derived_partial!(
         pub id: String,
         /// Username
         pub username: String,
+        /// Discriminator
+        pub discriminator: String,
+        /// Display name
+        pub display_name: String,
         #[serde(skip_serializing_if = "Option::is_none")]
         /// Avatar attachment
         pub avatar: Option<File>,

crates/core/database/src/util/bridge/v0.rs

@@ -257,6 +257,8 @@ impl crate::User {
 
         User {
             username: self.username,
+            discriminator: self.discriminator,
+            display_name: self.display_name,
             avatar: self.avatar.map(|file| file.into()),
             relations: vec![],
             badges: self.badges.unwrap_or_default() as u32,

crates/core/models/src/v0/users.rs

@@ -8,6 +8,10 @@ auto_derived!(
         pub id: String,
         /// Username
         pub username: String,
+        /// Discriminator
+        pub discriminator: String,
+        /// Display name
+        pub display_name: String,
         #[serde(skip_serializing_if = "Option::is_none")]
         /// Avatar attachment
         pub avatar: Option<File>,

crates/delta/src/routes/bots/create.rs

@@ -38,14 +38,12 @@ pub async fn create_bot(db: &Db, user: User, info: Json<DataCreateBot>) -> Resul
         return Err(Error::ReachedMaximumBots);
     }
 
-    if db.is_username_taken(&info.name).await? {
-        return Err(Error::UsernameTaken);
-    }
-
     let id = Ulid::new().to_string();
+    let username = User::validate_username(info.name)?;
     let bot_user = User {
         id: id.clone(),
-        username: info.name.trim().to_string(),
+        discriminator: User::find_discriminator(db, &username, None).await?,
+        username,
         bot: Some(BotInformation {
             owner: user.id.clone(),
         }),

crates/delta/src/routes/bots/edit.rs

@@ -58,10 +58,6 @@ pub async fn edit_bot(
     }
 
     if let Some(name) = data.name {
-        if db.is_username_taken(&name).await? {
-            return Err(Error::UsernameTaken);
-        }
-
         let mut user = db.fetch_user(&bot.id).await?;
         user.update_username(db, name).await?;
     }

crates/delta/src/routes/onboard/complete.rs

@@ -34,9 +34,10 @@ pub async fn req(
     data.validate()
         .map_err(|error| Error::FailedValidation { error })?;
 
-    let username = User::validate_username(db, data.username).await?;
+    let username = User::validate_username(data.username)?;
     let user = User {
         id: session.user_id,
+        discriminator: User::find_discriminator(db, &username, None).await?,
         username,
         ..Default::default()
     };

crates/delta/src/routes/users/edit_user.rs

@@ -8,6 +8,8 @@ use rocket::State;
 use serde::{Deserialize, Serialize};
 use validator::Validate;
 
+use crate::util::regex::RE_DISPLAY_NAME;
+
 /// # Profile Data
 #[derive(Validate, Serialize, Deserialize, Debug, JsonSchema)]
 pub struct UserProfileData {
@@ -24,6 +26,10 @@ pub struct UserProfileData {
 /// # User Data
 #[derive(Validate, Serialize, Deserialize, JsonSchema)]
 pub struct DataEditUser {
+    /// New display name
+    #[serde(rename = "displayName")]
+    #[validate(length(min = 2, max = 32), regex = "RE_DISPLAY_NAME")]
+    display_name: Option<String>,
     /// Attachment Id for avatar
     #[validate(length(min = 1, max = 128))]
     avatar: Option<String>,
@@ -84,7 +90,8 @@ pub async fn req(
     }
 
     // Exit out early if nothing is changed
-    if data.status.is_none()
+    if data.display_name.is_none()
+        && data.status.is_none()
         && data.profile.is_none()
         && data.avatar.is_none()
         && data.badges.is_none()

crates/delta/src/routes/users/send_friend_request.rs

@@ -8,6 +8,7 @@ use serde::{Deserialize, Serialize};
 /// # User Lookup Information
 #[derive(Serialize, Deserialize, JsonSchema)]
 pub struct DataSendFriendRequest {
+    /// Username and discriminator combo separated by #
     username: String,
 }
 
@@ -21,12 +22,16 @@ pub async fn req(
     user: User,
     data: Json<DataSendFriendRequest>,
 ) -> Result<Json<User>> {
-    let mut target = db.fetch_user_by_username(&data.username).await?;
+    if let Some((username, discriminator)) = data.username.split_once('#') {
+        let mut target = db.fetch_user_by_username(username, discriminator).await?;
 
-    if user.bot.is_some() || target.bot.is_some() {
+        if user.bot.is_some() || target.bot.is_some() {
-        return Err(Error::IsBot);
+            return Err(Error::IsBot);
+        }
+
+        user.add_friend(db, &mut target).await?;
+        Ok(Json(target.with_auto_perspective(db, &user).await))
+    } else {
+        Err(Error::InvalidProperty)
     }
-
-    user.add_friend(db, &mut target).await?;
-    Ok(Json(target.with_auto_perspective(db, &user).await))
 }

crates/delta/src/util/regex.rs

@@ -1,12 +1,17 @@
 use once_cell::sync::Lazy;
 use regex::Regex;
 
+/// Regex for valid display names
+///
+/// Block zero width space
+/// Block newline and carriage return
+pub static RE_DISPLAY_NAME: Lazy<Regex> = Lazy::new(|| Regex::new(r"^[^\u200B\n\r]+$").unwrap());
+
 /// Regex for valid usernames
 ///
 /// Block zero width space
 /// Block lookalike characters
-pub static RE_USERNAME: Lazy<Regex> =
+pub static RE_USERNAME: Lazy<Regex> = Lazy::new(|| Regex::new(r"^(\p{L}|[\d_.-])+$").unwrap());
-    Lazy::new(|| Regex::new(r"^[^\u200BА-Яа-яΑ-Ωα-ω@#:\n\r\[\]]+$").unwrap());
 
 /// Regex for valid emoji names
 ///

crates/quark/src/impl/dummy/users/user.rs

@@ -9,11 +9,12 @@ impl AbstractUser for DummyDb {
         Ok(User {
             id: id.into(),
             username: "username".into(),
+            discriminator: "0000".into(),
             ..Default::default()
         })
     }
 
-    async fn fetch_user_by_username(&self, username: &str) -> Result<User> {
+    async fn fetch_user_by_username(&self, username: &str, _discriminator: &str) -> Result<User> {
         self.fetch_user(username).await
     }
 
@@ -45,8 +46,8 @@ impl AbstractUser for DummyDb {
         Ok(vec![self.fetch_user("id").await.unwrap()])
     }
 
-    async fn is_username_taken(&self, _username: &str) -> Result<bool> {
+    async fn fetch_discriminators_in_use(&self, _username: &str) -> Result<Vec<String>> {
-        Ok(false)
+        Ok(vec![])
     }
 
     async fn fetch_mutual_user_ids(&self, _user_a: &str, _user_b: &str) -> Result<Vec<String>> {

crates/quark/src/impl/generic/users/user.rs

@@ -8,7 +8,9 @@ use crate::{perms, Database, Error, Result};
 
 use futures::try_join;
 use impl_ops::impl_op_ex_commutative;
+use rand::seq::SliceRandom;
 use revolt_presence::filter_online;
+use std::collections::HashSet;
 use std::ops;
 
 impl_op_ex_commutative!(+ |a: &i32, b: &Badges| -> i32 { *a | *b as i32 });
@@ -169,15 +171,7 @@ impl User {
     }
 
     /// Sanitise and validate a username can be used
-    pub async fn validate_username(db: &Database, username: String) -> Result<String> {
+    pub fn validate_username(username: String) -> Result<String> {
-        // Trim surrounding spaces
-        let username = username.trim().to_string();
-
-        // Make sure username is still at least 3 characters
-        if username.len() < 2 {
-            return Err(Error::InvalidUsername);
-        }
-
         // Copy the username for validation
         let username_lowercase = username.to_lowercase();
 
@@ -199,25 +193,74 @@ impl User {
             }
         }
 
-        // Make sure the username isn't taken
+        Ok(username)
-        if db.is_username_taken(&username).await? {
+    }
+
+    // Find a free discriminator for a given username
+    pub async fn find_discriminator(
+        db: &Database,
+        username: &str,
+        preferred: Option<String>,
+    ) -> Result<String> {
+        let search_space: HashSet<String> = (0..9999).map(|v| format!("{:0>4}", v)).collect();
+        let used_discriminators: HashSet<String> = db
+            .fetch_discriminators_in_use(username)
+            .await?
+            .into_iter()
+            .collect();
+
+        let available_discriminators: Vec<&String> =
+            search_space.difference(&used_discriminators).collect();
+
+        if available_discriminators.is_empty() {
             return Err(Error::UsernameTaken);
         }
 
-        Ok(username)
+        if let Some(preferred) = preferred {
+            if available_discriminators.contains(&&preferred) {
+                return Ok(preferred.to_string());
+            }
+        }
+
+        let mut rng = rand::thread_rng();
+        Ok(available_discriminators
+            .choose(&mut rng)
+            .expect("we can assert this has an element")
+            .to_string())
     }
 
     /// Update a user's username
     pub async fn update_username(&mut self, db: &Database, username: String) -> Result<()> {
-        self.update(
+        let username = User::validate_username(username)?;
-            db,
+        if self.username.to_lowercase() == username.to_lowercase() {
-            PartialUser {
+            self.update(
-                username: Some(User::validate_username(db, username).await?),
+                db,
-                ..Default::default()
+                PartialUser {
-            },
+                    username: Some(username),
-            vec![],
+                    ..Default::default()
-        )
+                },
-        .await
+                vec![],
+            )
+            .await
+        } else {
+            self.update(
+                db,
+                PartialUser {
+                    discriminator: Some(
+                        User::find_discriminator(
+                            db,
+                            &username,
+                            Some(self.discriminator.to_string()),
+                        )
+                        .await?,
+                    ),
+                    username: Some(username),
+                    ..Default::default()
+                },
+                vec![],
+            )
+            .await
+        }
     }
 
     /// Apply a certain relationship between two users

crates/quark/src/impl/mongo/users/user.rs

@@ -9,14 +9,16 @@ use crate::{AbstractUser, Error, Result};
 
 use super::super::MongoDb;
 
-static FIND_USERNAME_OPTIONS: Lazy<FindOneOptions> = Lazy::new(|| FindOneOptions::builder()
+static FIND_USERNAME_OPTIONS: Lazy<FindOneOptions> = Lazy::new(|| {
-    .collation(
+    FindOneOptions::builder()
-        Collation::builder()
+        .collation(
-            .locale("en")
+            Collation::builder()
-            .strength(CollationStrength::Secondary)
+                .locale("en")
-            .build()
+                .strength(CollationStrength::Secondary)
-    )
+                .build(),
-    .build());
+        )
+        .build()
+});
 
 static COL: &str = "users";
 
@@ -26,11 +28,12 @@ impl AbstractUser for MongoDb {
         self.find_one_by_id(COL, id).await
     }
 
-    async fn fetch_user_by_username(&self, username: &str) -> Result<User> {
+    async fn fetch_user_by_username(&self, username: &str, discriminator: &str) -> Result<User> {
         self.find_one_with_options(
             COL,
             doc! {
-                "username": username
+                "username": username,
+                "discriminator": discriminator
             },
             FIND_USERNAME_OPTIONS.clone(),
         )
@@ -106,13 +109,34 @@ impl AbstractUser for MongoDb {
         Ok(users)
     }
 
-    async fn is_username_taken(&self, username: &str) -> Result<bool> {
+    async fn fetch_discriminators_in_use(&self, username: &str) -> Result<Vec<String>> {
-        // ! FIXME: move this up to generic
+        Ok(self
-        match self.fetch_user_by_username(username).await {
+            .col::<Document>(COL)
-            Ok(_) => Ok(true),
+            .find(
-            Err(Error::NotFound) => Ok(false),
+                doc! {
-            Err(error) => Err(error),
+                    "username": username
-        }
+                },
+                FindOptions::builder()
+                    .collation(
+                        Collation::builder()
+                            .locale("en")
+                            .strength(CollationStrength::Secondary)
+                            .build(),
+                    )
+                    .projection(doc! { "_id": 0, "discriminator": 1 })
+                    .build(),
+            )
+            .await
+            .map_err(|_| Error::DatabaseError {
+                operation: "find",
+                with: "users",
+            })?
+            .filter_map(|s| async { s.ok() })
+            .collect::<Vec<Document>>()
+            .await
+            .into_iter()
+            .filter_map(|x| x.get_str("discriminator").ok().map(|x| x.to_string()))
+            .collect::<Vec<String>>())
     }
 
     async fn fetch_mutual_user_ids(&self, user_a: &str, user_b: &str) -> Result<Vec<String>> {

crates/quark/src/models/users/user.rs

@@ -128,6 +128,10 @@ pub struct User {
     pub id: String,
     /// Username
     pub username: String,
+    /// Discriminator
+    pub discriminator: String,
+    /// Display name
+    pub display_name: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     /// Avatar attachment
     pub avatar: Option<File>,

crates/quark/src/traits/users/user.rs

@@ -7,7 +7,7 @@ pub trait AbstractUser: Sync + Send {
     async fn fetch_user(&self, id: &str) -> Result<User>;
 
     /// Fetch a user from the database by their username
-    async fn fetch_user_by_username(&self, username: &str) -> Result<User>;
+    async fn fetch_user_by_username(&self, username: &str, discriminator: &str) -> Result<User>;
 
     /// Fetch a user from the database by their session token
     async fn fetch_user_by_token(&self, token: &str) -> Result<User>;
@@ -29,8 +29,8 @@ pub trait AbstractUser: Sync + Send {
     /// Fetch multiple users by their ids
     async fn fetch_users<'a>(&self, ids: &'a [String]) -> Result<Vec<User>>;
 
-    /// Check whether a username is already in use by another user
+    /// Fetch all discriminators in use for a username
-    async fn is_username_taken(&self, username: &str) -> Result<bool>;
+    async fn fetch_discriminators_in_use(&self, username: &str) -> Result<Vec<String>>;
 
     /// Fetch ids of users that both users are friends with
     async fn fetch_mutual_user_ids(&self, user_a: &str, user_b: &str) -> Result<Vec<String>>;