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|
package filters
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/containers/common/libnetwork/types"
"github.com/containers/common/pkg/timetype"
)
// ComputeUntilTimestamp extracts until timestamp from filters
func ComputeUntilTimestamp(filterValues []string) (time.Time, error) {
invalid := time.Time{}
if len(filterValues) != 1 {
return invalid, errors.New("specify exactly one timestamp for until")
}
ts, err := timetype.GetTimestamp(filterValues[0], time.Now())
if err != nil {
return invalid, err
}
seconds, nanoseconds, err := timetype.ParseTimestamps(ts, 0)
if err != nil {
return invalid, err
}
return time.Unix(seconds, nanoseconds), nil
}
// filtersFromRequests extracts the "filters" parameter from the specified
// http.Request. The parameter can either be a `map[string][]string` as done
// in new versions of Docker and libpod, or a `map[string]map[string]bool` as
// done in older versions of Docker. We have to do a bit of Yoga to support
// both - just as Docker does as well.
//
// Please refer to https://github.com/containers/podman/issues/6899 for some
// background.
//
// revive does not like the name because the package is already called filters
//
//nolint:revive
func FiltersFromRequest(r *http.Request) ([]string, error) {
var (
compatFilters map[string]map[string]bool
filters map[string][]string
raw []byte
)
if _, found := r.URL.Query()["filters"]; found {
raw = []byte(r.Form.Get("filters"))
} else if _, found := r.URL.Query()["Filters"]; found {
raw = []byte(r.Form.Get("Filters"))
} else {
return []string{}, nil
}
// Backwards compat with older versions of Docker.
if err := json.Unmarshal(raw, &compatFilters); err == nil {
libpodFilters := make([]string, 0, len(compatFilters))
for filterKey, filterMap := range compatFilters {
for filterValue, toAdd := range filterMap {
if toAdd {
libpodFilters = append(libpodFilters, fmt.Sprintf("%s=%s", filterKey, filterValue))
}
}
}
return libpodFilters, nil
}
if err := json.Unmarshal(raw, &filters); err != nil {
return nil, err
}
libpodFilters := make([]string, 0, len(filters))
for filterKey, filterSlice := range filters {
for _, filterValue := range filterSlice {
libpodFilters = append(libpodFilters, fmt.Sprintf("%s=%s", filterKey, filterValue))
}
}
return libpodFilters, nil
}
// PrepareFilters prepares a *map[string][]string of filters to be later searched
// in lipod and compat API to get desired filters
func PrepareFilters(r *http.Request) (map[string][]string, error) {
filtersList, err := FiltersFromRequest(r)
if err != nil {
return nil, err
}
filterMap := map[string][]string{}
for _, filter := range filtersList {
split := strings.SplitN(filter, "=", 2)
if len(split) > 1 {
filterMap[split[0]] = append(filterMap[split[0]], split[1])
}
}
return filterMap, nil
}
// MatchLabelFilters matches labels and returns true if they are valid
func MatchLabelFilters(filterValues []string, labels map[string]string) bool {
outer:
for _, filterValue := range filterValues {
filterKey, filterValue := splitFilterValue(filterValue)
for labelKey, labelValue := range labels {
if filterValue == "" || labelValue == filterValue {
if labelKey == filterKey || matchPattern(filterKey, labelKey) {
continue outer
}
}
}
return false
}
return true
}
// MatchNegatedLabelFilters matches negated labels and returns true if they are valid
func MatchNegatedLabelFilters(filterValues []string, labels map[string]string) bool {
for _, filterValue := range filterValues {
filterKey, filterValue := splitFilterValue(filterValue)
for labelKey, labelValue := range labels {
if filterValue == "" || labelValue == filterValue {
if labelKey == filterKey || matchPattern(filterKey, labelKey) {
return false
}
}
}
}
return true
}
func splitFilterValue(filterValue string) (string, string) {
filterArray := strings.SplitN(filterValue, "=", 2)
filterKey := filterArray[0]
if len(filterArray) > 1 {
filterValue = filterArray[1]
} else {
filterValue = ""
}
return filterKey, filterValue
}
func matchPattern(pattern string, value string) bool {
if strings.Contains(pattern, "*") {
filter := fmt.Sprintf("*%s*", pattern)
filter = strings.ReplaceAll(filter, string(filepath.Separator), "|")
newName := strings.ReplaceAll(value, string(filepath.Separator), "|")
match, _ := filepath.Match(filter, newName)
return match
}
return false
}
// FilterID is a function used to compare an id against a set of ids, if the
// input is hex we check if the prefix matches. Otherwise we assume it is a
// regex and try to match that.
// see https://github.com/containers/podman/issues/18471 for why we do this
func FilterID(id string, filters []string) bool {
for _, want := range filters {
isRegex := types.NotHexRegex.MatchString(want)
if isRegex {
match, err := regexp.MatchString(want, id)
if err == nil && match {
return true
}
} else if strings.HasPrefix(id, strings.ToLower(want)) {
return true
}
}
return false
}
|
