Unification of label filter across list/prune endpoints

Signed-off-by: Jakub Guzik <jakubmguzik@gmail.com>

8 files changed, 111 insertions, 105 deletions

diff --git a/libpod/image/filters.go b/libpod/image/filters.go
index 37d3cb6a5..d316c6956 100644
--- a/libpod/image/filters.go
+++ b/libpod/image/filters.go
@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/containers/podman/v3/pkg/inspect"
+	"github.com/containers/podman/v3/pkg/util"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -78,23 +79,14 @@ func ReadOnlyFilter(readOnly bool) ResultFilter {
 }
 
 // LabelFilter allows you to filter by images labels key and/or value
-func LabelFilter(ctx context.Context, labelfilter string) ResultFilter {
+func LabelFilter(ctx context.Context, filter string) ResultFilter {
 	// We need to handle both label=key and label=key=value
 	return func(i *Image) bool {
-		var value string
-		splitFilter := strings.SplitN(labelfilter, "=", 2)
-		key := splitFilter[0]
-		if len(splitFilter) > 1 {
-			value = splitFilter[1]
-		}
 		labels, err := i.Labels(ctx)
 		if err != nil {
 			return false
 		}
-		if len(strings.TrimSpace(labels[key])) > 0 && len(strings.TrimSpace(value)) == 0 {
-			return true
-		}
-		return labels[key] == value
+		return util.MatchLabelFilters([]string{filter}, labels)
 	}
 }
 
diff --git a/libpod/image/prune.go b/libpod/image/prune.go
index 21867698a..1ef35ef83 100644
--- a/libpod/image/prune.go
+++ b/libpod/image/prune.go
@@ -9,6 +9,7 @@ import (
 	"github.com/containers/podman/v3/libpod/events"
 	"github.com/containers/podman/v3/pkg/domain/entities/reports"
 	"github.com/containers/podman/v3/pkg/timetype"
+	"github.com/containers/podman/v3/pkg/util"
 	"github.com/containers/storage"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -17,24 +18,12 @@ import (
 func generatePruneFilterFuncs(filter, filterValue string) (ImageFilter, error) {
 	switch filter {
 	case "label":
-		var filterArray = strings.SplitN(filterValue, "=", 2)
-		var filterKey = filterArray[0]
-		if len(filterArray) > 1 {
-			filterValue = filterArray[1]
-		} else {
-			filterValue = ""
-		}
 		return func(i *Image) bool {
 			labels, err := i.Labels(context.Background())
 			if err != nil {
 				return false
 			}
-			for labelKey, labelValue := range labels {
-				if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
-					return true
-				}
-			}
-			return false
+			return util.MatchLabelFilters([]string{filterValue}, labels)
 		}, nil
 
 	case "until":
diff --git a/libpod/network/netconflist.go b/libpod/network/netconflist.go
index b358bc530..179620a0d 100644
--- a/libpod/network/netconflist.go
+++ b/libpod/network/netconflist.go
@@ -225,7 +225,7 @@ func IfPassesFilter(netconf *libcni.NetworkConfigList, filters map[string][]stri
 
 		case "label":
 			// matches all labels
-			result = matchPruneLabelFilters(netconf, filterValues)
+			result = util.MatchLabelFilters(filterValues, GetNetworkLabels(netconf))
 
 		case "driver":
 			// matches only for the DefaultNetworkDriver
@@ -260,7 +260,7 @@ func IfPassesPruneFilter(config *config.Config, netconf *libcni.NetworkConfigLis
 	for key, filterValues := range f {
 		switch strings.ToLower(key) {
 		case "label":
-			return matchPruneLabelFilters(netconf, filterValues), nil
+			return util.MatchLabelFilters(filterValues, GetNetworkLabels(netconf)), nil
 		case "until":
 			until, err := util.ComputeUntilTimestamp(key, filterValues)
 			if err != nil {
@@ -280,29 +280,6 @@ func IfPassesPruneFilter(config *config.Config, netconf *libcni.NetworkConfigLis
 	return false, nil
 }
 
-func matchPruneLabelFilters(netconf *libcni.NetworkConfigList, filterValues []string) bool {
-	labels := GetNetworkLabels(netconf)
-	result := true
-outer:
-	for _, filterValue := range filterValues {
-		filterArray := strings.SplitN(filterValue, "=", 2)
-		filterKey := filterArray[0]
-		if len(filterArray) > 1 {
-			filterValue = filterArray[1]
-		} else {
-			filterValue = ""
-		}
-		for labelKey, labelValue := range labels {
-			if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
-				result = true
-				continue outer
-			}
-		}
-		result = false
-	}
-	return result
-}
-
 func getCreatedTimestamp(config *config.Config, netconf *libcni.NetworkConfigList) (*time.Time, error) {
 	networkConfigPath, err := GetCNIConfigPathByNameOrID(config, netconf.Name)
 	if err != nil {
diff --git a/pkg/domain/filters/containers.go b/pkg/domain/filters/containers.go
index 02727e841..9cae01dc0 100644
--- a/pkg/domain/filters/containers.go
+++ b/pkg/domain/filters/containers.go
@@ -23,27 +23,7 @@ func GenerateContainerFilterFuncs(filter string, filterValues []string, r *libpo
 	case "label":
 		// we have to match that all given labels exits on that container
 		return func(c *libpod.Container) bool {
-			labels := c.Labels()
-			for _, filterValue := range filterValues {
-				matched := false
-				filterArray := strings.SplitN(filterValue, "=", 2)
-				filterKey := filterArray[0]
-				if len(filterArray) > 1 {
-					filterValue = filterArray[1]
-				} else {
-					filterValue = ""
-				}
-				for labelKey, labelValue := range labels {
-					if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
-						matched = true
-						break
-					}
-				}
-				if !matched {
-					return false
-				}
-			}
-			return true
+			return util.MatchLabelFilters(filterValues, c.Labels())
 		}, nil
 	case "name":
 		// we only have to match one name
diff --git a/pkg/domain/filters/pods.go b/pkg/domain/filters/pods.go
index 0490a4848..9a1c7d19d 100644
--- a/pkg/domain/filters/pods.go
+++ b/pkg/domain/filters/pods.go
@@ -114,26 +114,7 @@ func GeneratePodFilterFunc(filter string, filterValues []string) (
 	case "label":
 		return func(p *libpod.Pod) bool {
 			labels := p.Labels()
-			for _, filterValue := range filterValues {
-				matched := false
-				filterArray := strings.SplitN(filterValue, "=", 2)
-				filterKey := filterArray[0]
-				if len(filterArray) > 1 {
-					filterValue = filterArray[1]
-				} else {
-					filterValue = ""
-				}
-				for labelKey, labelValue := range labels {
-					if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
-						matched = true
-						break
-					}
-				}
-				if !matched {
-					return false
-				}
-			}
-			return true
+			return util.MatchLabelFilters(filterValues, labels)
 		}, nil
 	case "network":
 		return func(p *libpod.Pod) bool {
diff --git a/pkg/domain/filters/volumes.go b/pkg/domain/filters/volumes.go
index bc1756cf5..9b2fc5280 100644
--- a/pkg/domain/filters/volumes.go
+++ b/pkg/domain/filters/volumes.go
@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/containers/podman/v3/libpod"
+	"github.com/containers/podman/v3/pkg/util"
 	"github.com/pkg/errors"
 )
 
@@ -29,21 +30,9 @@ func GenerateVolumeFilters(filters url.Values) ([]libpod.VolumeFilter, error) {
 					return v.Scope() == scopeVal
 				})
 			case "label":
-				filterArray := strings.SplitN(val, "=", 2)
-				filterKey := filterArray[0]
-				var filterVal string
-				if len(filterArray) > 1 {
-					filterVal = filterArray[1]
-				} else {
-					filterVal = ""
-				}
+				filter := val
 				vf = append(vf, func(v *libpod.Volume) bool {
-					for labelKey, labelValue := range v.Labels() {
-						if labelKey == filterKey && (filterVal == "" || labelValue == filterVal) {
-							return true
-						}
-					}
-					return false
+					return util.MatchLabelFilters([]string{filter}, v.Labels())
 				})
 			case "opt":
 				filterArray := strings.SplitN(val, "=", 2)
diff --git a/pkg/util/filters.go b/pkg/util/filters.go
index 51b2c5331..90daef402 100644
--- a/pkg/util/filters.go
+++ b/pkg/util/filters.go
@@ -11,7 +11,7 @@ import (
 	"github.com/pkg/errors"
 )
 
-// ComputeUntilTimestamp extracts unitil timestamp from filters
+// ComputeUntilTimestamp extracts until timestamp from filters
 func ComputeUntilTimestamp(filter string, filterValues []string) (time.Time, error) {
 	invalid := time.Time{}
 	if len(filterValues) != 1 {
@@ -93,3 +93,24 @@ func PrepareFilters(r *http.Request) (*map[string][]string, error) {
 	}
 	return &filterMap, nil
 }
+
+// MatchLabelFilters matches labels and returs true if they are valid
+func MatchLabelFilters(filterValues []string, labels map[string]string) bool {
+outer:
+	for _, filterValue := range filterValues {
+		filterArray := strings.SplitN(filterValue, "=", 2)
+		filterKey := filterArray[0]
+		if len(filterArray) > 1 {
+			filterValue = filterArray[1]
+		} else {
+			filterValue = ""
+		}
+		for labelKey, labelValue := range labels {
+			if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
+				continue outer
+			}
+		}
+		return false
+	}
+	return true
+}
diff --git a/pkg/util/filters_test.go b/pkg/util/filters_test.go
new file mode 100644
index 000000000..4771f682b
--- /dev/null
+++ b/pkg/util/filters_test.go
@@ -0,0 +1,77 @@
+package util
+
+import "testing"
+
+func TestMatchLabelFilters(t *testing.T) {
+	testLabels := map[string]string{
+		"label1": "",
+		"label2": "test",
+		"label3": "",
+	}
+	type args struct {
+		filterValues []string
+		labels       map[string]string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "Match when all filters the same as labels",
+			args: args{
+				filterValues: []string{"label1", "label3", "label2=test"},
+				labels:       testLabels,
+			},
+			want: true,
+		},
+		{
+			name: "Match when filter value not provided in args",
+			args: args{
+				filterValues: []string{"label2"},
+				labels:       testLabels,
+			},
+			want: true,
+		},
+		{
+			name: "Match when no filter value is given",
+			args: args{
+				filterValues: []string{"label2="},
+				labels:       testLabels,
+			},
+			want: true,
+		},
+		{
+			name: "Do not match when filter value differs",
+			args: args{
+				filterValues: []string{"label2=differs"},
+				labels:       testLabels,
+			},
+			want: false,
+		},
+		{
+			name: "Do not match when filter value not listed in labels",
+			args: args{
+				filterValues: []string{"label1=xyz"},
+				labels:       testLabels,
+			},
+			want: false,
+		},
+		{
+			name: "Do not match when one from many not ok",
+			args: args{
+				filterValues: []string{"label1=xyz", "invalid=valid"},
+				labels:       testLabels,
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			if got := MatchLabelFilters(tt.args.filterValues, tt.args.labels); got != tt.want {
+				t.Errorf("MatchLabelFilters() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}