dex/pkg/groups/groups.go

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// Package groups contains helper functions related to groups
package groups
// Filter filters out any groups of given that are not in required. Thus it may
// happen that the resulting slice is empty.
func Filter(given, required []string) []string {
groups := []string{}
groupFilter := make(map[string]struct{})
for _, group := range required {
groupFilter[group] = struct{}{}
}
for _, group := range given {
if _, ok := groupFilter[group]; ok {
groups = append(groups, group)
}
}
return groups
}