Unification of label filter across list/prune endpoints

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

2 files changed, 99 insertions, 1 deletions

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)
+			}
+		})
+	}
+}