281 lines
8.9 KiB
Go
281 lines
8.9 KiB
Go
package server
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import (
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"database/sql"
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"errors"
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"git.zio.sh/astra/ntfy/v2/util"
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"net/netip"
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"time"
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_ "github.com/mattn/go-sqlite3" // SQLite driver
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)
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const (
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subscriptionIDPrefix = "wps_"
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subscriptionIDLength = 10
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subscriptionEndpointLimitPerSubscriberIP = 10
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)
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var (
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errWebPushNoRows = errors.New("no rows found")
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errWebPushTooManySubscriptions = errors.New("too many subscriptions")
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errWebPushUserIDCannotBeEmpty = errors.New("user ID cannot be empty")
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)
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const (
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createWebPushSubscriptionsTableQuery = `
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BEGIN;
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CREATE TABLE IF NOT EXISTS subscription (
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id TEXT PRIMARY KEY,
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endpoint TEXT NOT NULL,
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key_auth TEXT NOT NULL,
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key_p256dh TEXT NOT NULL,
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user_id TEXT NOT NULL,
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subscriber_ip TEXT NOT NULL,
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updated_at INT NOT NULL,
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warned_at INT NOT NULL DEFAULT 0
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);
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CREATE UNIQUE INDEX IF NOT EXISTS idx_endpoint ON subscription (endpoint);
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CREATE INDEX IF NOT EXISTS idx_subscriber_ip ON subscription (subscriber_ip);
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CREATE TABLE IF NOT EXISTS subscription_topic (
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subscription_id TEXT NOT NULL,
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topic TEXT NOT NULL,
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PRIMARY KEY (subscription_id, topic),
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FOREIGN KEY (subscription_id) REFERENCES subscription (id) ON DELETE CASCADE
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);
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CREATE INDEX IF NOT EXISTS idx_topic ON subscription_topic (topic);
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CREATE TABLE IF NOT EXISTS schemaVersion (
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id INT PRIMARY KEY,
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version INT NOT NULL
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);
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COMMIT;
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`
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builtinStartupQueries = `
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PRAGMA foreign_keys = ON;
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`
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selectWebPushSubscriptionIDByEndpoint = `SELECT id FROM subscription WHERE endpoint = ?`
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selectWebPushSubscriptionCountBySubscriberIP = `SELECT COUNT(*) FROM subscription WHERE subscriber_ip = ?`
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selectWebPushSubscriptionsForTopicQuery = `
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SELECT id, endpoint, key_auth, key_p256dh, user_id
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FROM subscription_topic st
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JOIN subscription s ON s.id = st.subscription_id
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WHERE st.topic = ?
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ORDER BY endpoint
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`
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selectWebPushSubscriptionsExpiringSoonQuery = `
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SELECT id, endpoint, key_auth, key_p256dh, user_id
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FROM subscription
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WHERE warned_at = 0 AND updated_at <= ?
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`
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insertWebPushSubscriptionQuery = `
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INSERT INTO subscription (id, endpoint, key_auth, key_p256dh, user_id, subscriber_ip, updated_at, warned_at)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?)
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ON CONFLICT (endpoint)
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DO UPDATE SET key_auth = excluded.key_auth, key_p256dh = excluded.key_p256dh, user_id = excluded.user_id, subscriber_ip = excluded.subscriber_ip, updated_at = excluded.updated_at, warned_at = excluded.warned_at
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`
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updateWebPushSubscriptionWarningSentQuery = `UPDATE subscription SET warned_at = ? WHERE id = ?`
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deleteWebPushSubscriptionByEndpointQuery = `DELETE FROM subscription WHERE endpoint = ?`
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deleteWebPushSubscriptionByUserIDQuery = `DELETE FROM subscription WHERE user_id = ?`
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deleteWebPushSubscriptionByAgeQuery = `DELETE FROM subscription WHERE updated_at <= ?` // Full table scan!
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insertWebPushSubscriptionTopicQuery = `INSERT INTO subscription_topic (subscription_id, topic) VALUES (?, ?)`
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deleteWebPushSubscriptionTopicAllQuery = `DELETE FROM subscription_topic WHERE subscription_id = ?`
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)
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// Schema management queries
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const (
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currentWebPushSchemaVersion = 1
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insertWebPushSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)`
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selectWebPushSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
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)
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type webPushStore struct {
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db *sql.DB
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}
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func newWebPushStore(filename, startupQueries string) (*webPushStore, error) {
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db, err := sql.Open("sqlite3", filename)
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if err != nil {
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return nil, err
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}
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if err := setupWebPushDB(db); err != nil {
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return nil, err
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}
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if err := runWebPushStartupQueries(db, startupQueries); err != nil {
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return nil, err
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}
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return &webPushStore{
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db: db,
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}, nil
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}
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func setupWebPushDB(db *sql.DB) error {
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// If 'schemaVersion' table does not exist, this must be a new database
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rows, err := db.Query(selectWebPushSchemaVersionQuery)
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if err != nil {
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return setupNewWebPushDB(db)
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}
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return rows.Close()
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}
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func setupNewWebPushDB(db *sql.DB) error {
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if _, err := db.Exec(createWebPushSubscriptionsTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(insertWebPushSchemaVersion, currentWebPushSchemaVersion); err != nil {
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return err
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}
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return nil
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}
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func runWebPushStartupQueries(db *sql.DB, startupQueries string) error {
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if _, err := db.Exec(startupQueries); err != nil {
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return err
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}
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if _, err := db.Exec(builtinStartupQueries); err != nil {
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return err
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}
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return nil
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}
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// UpsertSubscription adds or updates Web Push subscriptions for the given topics and user ID. It always first deletes all
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// existing entries for a given endpoint.
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func (c *webPushStore) UpsertSubscription(endpoint string, auth, p256dh, userID string, subscriberIP netip.Addr, topics []string) error {
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tx, err := c.db.Begin()
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if err != nil {
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return err
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}
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defer tx.Rollback()
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// Read number of subscriptions for subscriber IP address
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rowsCount, err := tx.Query(selectWebPushSubscriptionCountBySubscriberIP, subscriberIP.String())
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if err != nil {
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return err
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}
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defer rowsCount.Close()
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var subscriptionCount int
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if !rowsCount.Next() {
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return errWebPushNoRows
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}
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if err := rowsCount.Scan(&subscriptionCount); err != nil {
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return err
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}
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if err := rowsCount.Close(); err != nil {
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return err
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}
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// Read existing subscription ID for endpoint (or create new ID)
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rows, err := tx.Query(selectWebPushSubscriptionIDByEndpoint, endpoint)
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if err != nil {
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return err
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}
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defer rows.Close()
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var subscriptionID string
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if rows.Next() {
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if err := rows.Scan(&subscriptionID); err != nil {
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return err
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}
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} else {
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if subscriptionCount >= subscriptionEndpointLimitPerSubscriberIP {
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return errWebPushTooManySubscriptions
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}
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subscriptionID = util.RandomStringPrefix(subscriptionIDPrefix, subscriptionIDLength)
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}
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if err := rows.Close(); err != nil {
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return err
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}
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// Insert or update subscription
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updatedAt, warnedAt := time.Now().Unix(), 0
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if _, err = tx.Exec(insertWebPushSubscriptionQuery, subscriptionID, endpoint, auth, p256dh, userID, subscriberIP.String(), updatedAt, warnedAt); err != nil {
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return err
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}
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// Replace all subscription topics
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if _, err := tx.Exec(deleteWebPushSubscriptionTopicAllQuery, subscriptionID); err != nil {
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return err
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}
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for _, topic := range topics {
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if _, err = tx.Exec(insertWebPushSubscriptionTopicQuery, subscriptionID, topic); err != nil {
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return err
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}
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}
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return tx.Commit()
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}
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// SubscriptionsForTopic returns all subscriptions for the given topic
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func (c *webPushStore) SubscriptionsForTopic(topic string) ([]*webPushSubscription, error) {
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rows, err := c.db.Query(selectWebPushSubscriptionsForTopicQuery, topic)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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return c.subscriptionsFromRows(rows)
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}
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// SubscriptionsExpiring returns all subscriptions that have not been updated for a given time period
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func (c *webPushStore) SubscriptionsExpiring(warnAfter time.Duration) ([]*webPushSubscription, error) {
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rows, err := c.db.Query(selectWebPushSubscriptionsExpiringSoonQuery, time.Now().Add(-warnAfter).Unix())
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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return c.subscriptionsFromRows(rows)
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}
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// MarkExpiryWarningSent marks the given subscriptions as having received a warning about expiring soon
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func (c *webPushStore) MarkExpiryWarningSent(subscriptions []*webPushSubscription) error {
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tx, err := c.db.Begin()
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if err != nil {
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return err
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}
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defer tx.Rollback()
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for _, subscription := range subscriptions {
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if _, err := tx.Exec(updateWebPushSubscriptionWarningSentQuery, time.Now().Unix(), subscription.ID); err != nil {
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return err
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}
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}
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return tx.Commit()
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}
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func (c *webPushStore) subscriptionsFromRows(rows *sql.Rows) ([]*webPushSubscription, error) {
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subscriptions := make([]*webPushSubscription, 0)
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for rows.Next() {
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var id, endpoint, auth, p256dh, userID string
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if err := rows.Scan(&id, &endpoint, &auth, &p256dh, &userID); err != nil {
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return nil, err
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}
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subscriptions = append(subscriptions, &webPushSubscription{
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ID: id,
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Endpoint: endpoint,
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Auth: auth,
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P256dh: p256dh,
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UserID: userID,
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})
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}
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return subscriptions, nil
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}
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// RemoveSubscriptionsByEndpoint removes the subscription for the given endpoint
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func (c *webPushStore) RemoveSubscriptionsByEndpoint(endpoint string) error {
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_, err := c.db.Exec(deleteWebPushSubscriptionByEndpointQuery, endpoint)
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return err
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}
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// RemoveSubscriptionsByUserID removes all subscriptions for the given user ID
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func (c *webPushStore) RemoveSubscriptionsByUserID(userID string) error {
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if userID == "" {
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return errWebPushUserIDCannotBeEmpty
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}
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_, err := c.db.Exec(deleteWebPushSubscriptionByUserIDQuery, userID)
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return err
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}
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// RemoveExpiredSubscriptions removes all subscriptions that have not been updated for a given time period
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func (c *webPushStore) RemoveExpiredSubscriptions(expireAfter time.Duration) error {
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_, err := c.db.Exec(deleteWebPushSubscriptionByAgeQuery, time.Now().Add(-expireAfter).Unix())
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return err
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}
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// Close closes the underlying database connection
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func (c *webPushStore) Close() error {
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return c.db.Close()
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}
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