package server import ( "database/sql" "fmt" "time" "github.com/SherClockHolmes/webpush-go" _ "github.com/mattn/go-sqlite3" // SQLite driver ) const ( createWebPushSubscriptionsTableQuery = ` BEGIN; CREATE TABLE IF NOT EXISTS subscriptions ( id INTEGER PRIMARY KEY AUTOINCREMENT, topic TEXT NOT NULL, user_id TEXT, endpoint TEXT NOT NULL, key_auth TEXT NOT NULL, key_p256dh TEXT NOT NULL, updated_at DATETIME DEFAULT CURRENT_TIMESTAMP, warning_sent BOOLEAN DEFAULT FALSE ); CREATE TABLE IF NOT EXISTS schemaVersion ( id INT PRIMARY KEY, version INT NOT NULL ); CREATE INDEX IF NOT EXISTS idx_topic ON subscriptions (topic); CREATE INDEX IF NOT EXISTS idx_endpoint ON subscriptions (endpoint); CREATE UNIQUE INDEX IF NOT EXISTS idx_topic_endpoint ON subscriptions (topic, endpoint); COMMIT; ` insertWebPushSubscriptionQuery = ` INSERT OR REPLACE INTO subscriptions (topic, user_id, endpoint, key_auth, key_p256dh) VALUES (?, ?, ?, ?, ?) ` deleteWebPushSubscriptionByEndpointQuery = `DELETE FROM subscriptions WHERE endpoint = ?` deleteWebPushSubscriptionByUserIDQuery = `DELETE FROM subscriptions WHERE user_id = ?` deleteWebPushSubscriptionsByAgeQuery = `DELETE FROM subscriptions WHERE warning_sent = 1 AND updated_at <= datetime('now', ?)` selectWebPushSubscriptionsForTopicQuery = `SELECT endpoint, key_auth, key_p256dh, user_id FROM subscriptions WHERE topic = ?` selectWebPushSubscriptionsExpiringSoonQuery = `SELECT DISTINCT endpoint, key_auth, key_p256dh FROM subscriptions WHERE warning_sent = 0 AND updated_at <= datetime('now', ?)` updateWarningSentQuery = `UPDATE subscriptions SET warning_sent = true WHERE warning_sent = 0 AND updated_at <= datetime('now', ?)` ) // Schema management queries const ( currentWebPushSchemaVersion = 1 insertWebPushSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)` selectWebPushSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1` ) type webPushStore struct { db *sql.DB } func newWebPushStore(filename string) (*webPushStore, error) { db, err := sql.Open("sqlite3", filename) if err != nil { return nil, err } if err := setupWebPushDB(db); err != nil { return nil, err } return &webPushStore{ db: db, }, nil } func setupWebPushDB(db *sql.DB) error { // If 'schemaVersion' table does not exist, this must be a new database rows, err := db.Query(selectWebPushSchemaVersionQuery) if err != nil { return setupNewWebPushDB(db) } return rows.Close() } func setupNewWebPushDB(db *sql.DB) error { if _, err := db.Exec(createWebPushSubscriptionsTableQuery); err != nil { return err } if _, err := db.Exec(insertWebPushSchemaVersion, currentWebPushSchemaVersion); err != nil { return err } return nil } // UpdateSubscriptions updates the subscriptions for the given topics and user ID. It always first deletes all // existing entries for a given endpoint. func (c *webPushStore) UpdateSubscriptions(topics []string, userID string, subscription webpush.Subscription) error { tx, err := c.db.Begin() if err != nil { return err } defer tx.Rollback() if _, err := tx.Exec(deleteWebPushSubscriptionByEndpointQuery, subscription.Endpoint); err != nil { return err } for _, topic := range topics { if _, err = tx.Exec(insertWebPushSubscriptionQuery, topic, userID, subscription.Endpoint, subscription.Keys.Auth, subscription.Keys.P256dh); err != nil { return err } } return tx.Commit() } func (c *webPushStore) AddSubscription(topic string, userID string, subscription webpush.Subscription) error { _, err := c.db.Exec( insertWebPushSubscriptionQuery, topic, userID, subscription.Endpoint, subscription.Keys.Auth, subscription.Keys.P256dh, ) return err } func (c *webPushStore) SubscriptionsForTopic(topic string) (subscriptions []*webPushSubscription, err error) { rows, err := c.db.Query(selectWebPushSubscriptionsForTopicQuery, topic) if err != nil { return nil, err } defer rows.Close() var data []*webPushSubscription for rows.Next() { var userID, endpoint, auth, p256dh string if err = rows.Scan(&endpoint, &auth, &p256dh, &userID); err != nil { return nil, err } data = append(data, &webPushSubscription{ UserID: userID, BrowserSubscription: webpush.Subscription{ Endpoint: endpoint, Keys: webpush.Keys{ Auth: auth, P256dh: p256dh, }, }, }) } return data, nil } func (c *webPushStore) ExpireAndGetExpiringSubscriptions(warningDuration time.Duration, expiryDuration time.Duration) (subscriptions []webPushSubscription, err error) { // TODO this should be two functions tx, err := c.db.Begin() if err != nil { return nil, err } defer tx.Rollback() _, err = tx.Exec(deleteWebPushSubscriptionsByAgeQuery, fmt.Sprintf("-%.2f seconds", expiryDuration.Seconds())) if err != nil { return nil, err } rows, err := tx.Query(selectWebPushSubscriptionsExpiringSoonQuery, fmt.Sprintf("-%.2f seconds", warningDuration.Seconds())) if err != nil { return nil, err } defer rows.Close() var data []webPushSubscription for rows.Next() { i := webPushSubscription{} err = rows.Scan(&i.BrowserSubscription.Endpoint, &i.BrowserSubscription.Keys.Auth, &i.BrowserSubscription.Keys.P256dh) fmt.Printf("%v+", i) if err != nil { return nil, err } data = append(data, i) } // also set warning as sent _, err = tx.Exec(updateWarningSentQuery, fmt.Sprintf("-%.2f seconds", warningDuration.Seconds())) if err != nil { return nil, err } if err = tx.Commit(); err != nil { return nil, err } return data, nil } func (c *webPushStore) RemoveByEndpoint(endpoint string) error { _, err := c.db.Exec( deleteWebPushSubscriptionByEndpointQuery, endpoint, ) return err } func (c *webPushStore) RemoveByUserID(userID string) error { _, err := c.db.Exec( deleteWebPushSubscriptionByUserIDQuery, userID, ) return err } func (c *webPushStore) Close() error { return c.db.Close() }