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filter.go
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filter.go
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package postgres
import (
"fmt"
"net/netip"
"strings"
"github.com/pomerium/pomerium/pkg/storage"
)
func addFilterExpressionToQuery(query *string, args *[]interface{}, expr storage.FilterExpression) error {
compoundExpression := func(subexprs []storage.FilterExpression, op string) error {
*query += "( "
for i, subexpr := range subexprs {
if i > 0 {
*query += " " + op + " "
}
err := addFilterExpressionToQuery(query, args, subexpr)
if err != nil {
return err
}
}
*query += " )"
return nil
}
switch expr := expr.(type) {
case storage.AndFilterExpression:
return compoundExpression(expr, "AND")
case storage.OrFilterExpression:
return compoundExpression(expr, "OR")
case storage.EqualsFilterExpression:
switch strings.Join(expr.Fields, ".") {
case "type":
*query += schemaName + "." + recordsTableName + ".type = " + fmt.Sprintf("$%d", len(*args)+1)
*args = append(*args, expr.Value)
return nil
case "id":
*query += schemaName + "." + recordsTableName + ".id = " + fmt.Sprintf("$%d", len(*args)+1)
*args = append(*args, expr.Value)
return nil
case "$index":
if isCIDR(expr.Value) {
*query += schemaName + "." + recordsTableName + ".index_cidr >>= " + fmt.Sprintf("$%d", len(*args)+1)
*args = append(*args, expr.Value)
} else {
*query += " false "
}
return nil
default:
return fmt.Errorf("unsupported equals filter: %v", expr.Fields)
}
default:
return fmt.Errorf("unsupported filter expression: %T", expr)
}
}
func isCIDR(value string) bool {
if _, err := netip.ParsePrefix(value); err == nil {
return true
}
if _, err := netip.ParseAddr(value); err == nil {
return true
}
return false
}