add initial chat server stuff

chat/Cargo.toml

@@ -6,3 +6,19 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+foxchat = { path = "../foxchat" }
+axum = { version = "0.7.4", features = ["macros", "query", "tracing", "ws"] }
+clap = { version = "4.4.16", features = ["env", "derive"] }
+sqlx = { version = "0.7.3", features = ["runtime-tokio", "tls-rustls", "postgres", "migrate", "chrono", "json"] }
+serde = { version = "1.0.195", features = ["derive"] }
+serde_json = "1.0.111"
+ulid = { version = "1.1.0", features = ["serde"] }
+eyre = "0.6.11"
+color-eyre = "0.6.2"
+rsa = { version = "0.9.6", features = ["serde", "sha2"] }
+rand = "0.8.5"
+toml = "0.8.8"
+tokio = { version = "1.35.1", features = ["macros", "rt-multi-thread"] }
+tracing-subscriber = "0.3.18"
+tracing = "0.1.40"
+tower-http = { version = "0.5.1", features = ["trace"] }

chat/migrations/20240116203402_init.sql

@@ -0,0 +1,51 @@
+create type instance_status as enum ('active', 'suspended');
+
+create table identity_instances (
+    id         text primary key,
+    domain     text not null unique,
+    base_url   text not null,
+    public_key text not null,
+    status     instance_status not null default 'active',
+    reason     text
+);
+
+create table users (
+    id text primary key,
+    instance_id text not null references identity_instances (id) on delete cascade,
+    remote_user_id text not null,
+    username       text not null,
+    
+    avatar text -- URL, not hash, as this is a remote file
+);
+
+create unique index users_remote_user_id_idx on users (instance_id, remote_user_id);
+create unique index users_username_idx on users (instance_id, lower(username));
+
+create table guilds (
+    id       text primary key,
+    owner_id text not null references users (id) on delete cascade,
+    name     text not null
+);
+
+create table guilds_users (
+    guild_id text not null references guilds (id) on delete cascade,
+    user_id  text not null references users (id) on delete cascade,
+
+    primary key (guild_id, user_id)
+);
+
+create table channels (
+    id       text primary key,
+    guild_id text not null references guilds (id) on delete cascade,
+    name     text not null,
+    topic    text
+);
+
+create table messages (
+    id         text primary key,
+    channel_id text not null references channels (id) on delete cascade,
+    author_id  text not null,
+    updated_at timestamptz not null default now(),
+    
+    content text not null
+);