87 lines
2.0 KiB
Go
87 lines
2.0 KiB
Go
package main
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import (
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"database/sql"
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"encoding/hex"
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"errors"
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"fmt"
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"strings"
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"github.com/fiatjaf/go-nostr/event"
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"github.com/fiatjaf/go-nostr/filter"
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"github.com/rs/zerolog/log"
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)
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func (b *BasicRelay) QueryEvents(
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filter *filter.EventFilter,
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) (events []event.Event, err error) {
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var conditions []string
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var params []interface{}
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if filter == nil {
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err = errors.New("filter cannot be null")
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return
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}
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if filter.ID != "" {
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conditions = append(conditions, "id = ?")
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params = append(params, filter.ID)
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}
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if filter.Kind != nil && *filter.Kind != 0 {
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conditions = append(conditions, "kind = ?")
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params = append(params, filter.Kind)
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}
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if filter.Authors != nil {
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if len(filter.Authors) == 0 {
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// authors being [] means you won't get anything
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return
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} else {
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inkeys := make([]string, 0, len(filter.Authors))
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for _, key := range filter.Authors {
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// to prevent sql attack here we will check if
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// these keys are valid 32byte hex
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parsed, err := hex.DecodeString(key)
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if err != nil || len(parsed) != 32 {
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continue
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}
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inkeys = append(inkeys, fmt.Sprintf("'%x'", parsed))
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}
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conditions = append(conditions, `pubkey IN (`+strings.Join(inkeys, ",")+`)`)
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}
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}
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if filter.TagEvent != "" {
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conditions = append(conditions, tagConditions)
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params = append(params, filter.TagEvent)
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}
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if filter.TagProfile != "" {
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conditions = append(conditions, tagConditions)
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params = append(params, filter.TagProfile)
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}
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if filter.Since != 0 {
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conditions = append(conditions, "created_at > ?")
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params = append(params, filter.Since)
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}
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if len(conditions) == 0 {
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// fallback
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conditions = append(conditions, "true")
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}
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query := b.DB.Rebind("SELECT * FROM event WHERE " +
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strings.Join(conditions, " AND ") +
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" ORDER BY created_at LIMIT 100")
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err = b.DB.Select(&events, query, params...)
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if err != nil && err != sql.ErrNoRows {
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log.Warn().Err(err).Interface("filter", filter).Msg("failed to fetch events")
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err = fmt.Errorf("failed to fetch events: %w", err)
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}
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return
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}
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