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Add per-channel hashcash requirement via MODE +H <bits>. When set, PRIVMSG to the channel must include a valid hashcash stamp in the meta.hashcash field bound to the channel name and message body hash. Server validates stamp format, difficulty, date freshness, channel binding, body hash binding, and proof-of-work. Spent stamps are persisted to SQLite with 1-year TTL for replay prevention. Stamp format: 1:bits:YYMMDD:channel:bodyhash:counter Changes: - Schema: add hashcash_bits column to channels, spent_hashcash table - DB: queries for get/set channel hashcash bits, spent token CRUD - Hashcash: ChannelValidator, BodyHash, StampHash, MintChannelStamp - Handlers: validate hashcash on PRIVMSG, MODE +H/-H support - Pass meta through fanOut chain to store in messages - Prune spent hashcash tokens in cleanup loop (1-year TTL) - Client: MintChannelHashcash helper for CLI - Tests: 12 new channel_test.go + 10 new api_test.go integration tests - README: document +H mode, stamp format, and usage
82 lines
3.1 KiB
SQL
82 lines
3.1 KiB
SQL
-- Chat server schema (pre-1.0 consolidated)
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PRAGMA foreign_keys = ON;
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-- Sessions: each session is a user identity (nick + optional password + signing key)
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CREATE TABLE IF NOT EXISTS sessions (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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uuid TEXT NOT NULL UNIQUE,
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nick TEXT NOT NULL UNIQUE,
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password_hash TEXT NOT NULL DEFAULT '',
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signing_key TEXT NOT NULL DEFAULT '',
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away_message TEXT NOT NULL DEFAULT '',
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created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
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last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
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);
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CREATE INDEX IF NOT EXISTS idx_sessions_uuid ON sessions(uuid);
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-- Clients: each session can have multiple connected clients
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CREATE TABLE IF NOT EXISTS clients (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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uuid TEXT NOT NULL UNIQUE,
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session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
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token TEXT NOT NULL UNIQUE,
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created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
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last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
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);
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CREATE INDEX IF NOT EXISTS idx_clients_token ON clients(token);
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CREATE INDEX IF NOT EXISTS idx_clients_session ON clients(session_id);
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-- Channels
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CREATE TABLE IF NOT EXISTS channels (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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name TEXT NOT NULL UNIQUE,
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topic TEXT NOT NULL DEFAULT '',
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topic_set_by TEXT NOT NULL DEFAULT '',
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topic_set_at DATETIME,
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hashcash_bits INTEGER NOT NULL DEFAULT 0,
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created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
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updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
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);
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-- Channel members
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CREATE TABLE IF NOT EXISTS channel_members (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
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session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
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joined_at DATETIME DEFAULT CURRENT_TIMESTAMP,
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UNIQUE(channel_id, session_id)
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);
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-- Messages: IRC envelope format
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CREATE TABLE IF NOT EXISTS messages (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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uuid TEXT NOT NULL UNIQUE,
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command TEXT NOT NULL DEFAULT 'PRIVMSG',
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msg_from TEXT NOT NULL DEFAULT '',
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msg_to TEXT NOT NULL DEFAULT '',
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params TEXT NOT NULL DEFAULT '[]',
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body TEXT NOT NULL DEFAULT '[]',
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meta TEXT NOT NULL DEFAULT '{}',
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created_at DATETIME DEFAULT CURRENT_TIMESTAMP
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);
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CREATE INDEX IF NOT EXISTS idx_messages_to_id ON messages(msg_to, id);
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CREATE INDEX IF NOT EXISTS idx_messages_created ON messages(created_at);
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-- Spent hashcash tokens for replay prevention (1-year TTL)
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CREATE TABLE IF NOT EXISTS spent_hashcash (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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stamp_hash TEXT NOT NULL UNIQUE,
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created_at DATETIME DEFAULT CURRENT_TIMESTAMP
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);
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CREATE INDEX IF NOT EXISTS idx_spent_hashcash_created ON spent_hashcash(created_at);
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-- Per-client message queues for fan-out delivery
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CREATE TABLE IF NOT EXISTS client_queues (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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client_id INTEGER NOT NULL REFERENCES clients(id) ON DELETE CASCADE,
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message_id INTEGER NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
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created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
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UNIQUE(client_id, message_id)
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);
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CREATE INDEX IF NOT EXISTS idx_client_queues_client ON client_queues(client_id, id);
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