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stream_filter.go
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/
stream_filter.go
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package storage
import (
"context"
"fmt"
"net/netip"
"strings"
"github.com/pomerium/pomerium/pkg/grpc/databroker"
)
// A RecordStreamFilter filters a RecordStream.
type RecordStreamFilter func(record *databroker.Record) (keep bool)
// And creates a new RecordStreamFilter by applying both functions to a record.
func (filter RecordStreamFilter) And(
then RecordStreamFilter,
) RecordStreamFilter {
return func(record *databroker.Record) (keep bool) {
return filter(record) && then(record)
}
}
// FilteredRecordStreamGenerator creates a RecordStreamGenerator that only returns records that pass the filter.
func FilteredRecordStreamGenerator(
generator RecordStreamGenerator,
filter RecordStreamFilter,
) RecordStreamGenerator {
return func(ctx context.Context, block bool) (*databroker.Record, error) {
for {
record, err := generator(ctx, block)
if err != nil {
return nil, err
}
if !filter(record) {
continue
}
return record, nil
}
}
}
// RecordStreamFilterFromFilterExpression returns a RecordStreamFilter from a FilterExpression.
func RecordStreamFilterFromFilterExpression(
expr FilterExpression,
) (filter RecordStreamFilter, err error) {
if expr == nil {
return func(_ *databroker.Record) (keep bool) { return true }, nil
}
switch expr := expr.(type) {
case AndFilterExpression:
if len(expr) == 0 {
return func(_ *databroker.Record) (keep bool) { return true }, nil
}
fs := make([]RecordStreamFilter, len(expr))
for i, e := range expr {
fs[i], err = RecordStreamFilterFromFilterExpression(e)
if err != nil {
return nil, err
}
}
return func(record *databroker.Record) (keep bool) {
for _, f := range fs {
if !f(record) {
return false
}
}
return true
}, nil
case OrFilterExpression:
if len(expr) == 0 {
return func(_ *databroker.Record) (keep bool) { return true }, nil
}
fs := make([]RecordStreamFilter, len(expr))
for i, e := range expr {
fs[i], err = RecordStreamFilterFromFilterExpression(e)
if err != nil {
return nil, err
}
}
return func(record *databroker.Record) (keep bool) {
for _, f := range fs {
if f(record) {
return true
}
}
return false
}, nil
case EqualsFilterExpression:
switch strings.Join(expr.Fields, ".") {
case "id":
id := expr.Value
return func(record *databroker.Record) (keep bool) {
return record.GetId() == id
}, nil
case "$index":
ip, _ := netip.ParseAddr(expr.Value)
return func(record *databroker.Record) (keep bool) {
// indexed via CIDR
if ip.IsValid() {
msg, _ := record.GetData().UnmarshalNew()
cidr := GetRecordIndexCIDR(msg)
if cidr != nil && cidr.Contains(ip) {
return true
}
}
return false
}, nil
default:
return nil, fmt.Errorf("only id or $index are supported for query filters")
}
default:
panic(fmt.Sprintf("unsupported filter expression type: %T", expr))
}
}