istio.io/istio@v0.0.0-20240520182934-d79c90f27776/tools/istio-iptables/pkg/config/types.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package config
    16  
    17  import (
    18  	"strings"
    19  )
    20  
    21  func Split(s string) []string {
    22  	if s == "" {
    23  		return nil
    24  	}
    25  	return filterEmpty(strings.Split(s, ","))
    26  }
    27  
    28  func filterEmpty(strs []string) []string {
    29  	filtered := make([]string, 0, len(strs))
    30  	for _, s := range strs {
    31  		if s == "" {
    32  			continue
    33  		}
    34  		filtered = append(filtered, s)
    35  	}
    36  	return filtered
    37  }
    38  
    39  type InterceptFilter struct {
    40  	Values []string
    41  	Except bool
    42  }
    43  
    44  func ParseInterceptFilter(include, exclude string) InterceptFilter {
    45  	if include == "*" {
    46  		excludes := Split(exclude)
    47  		return InterceptAllExcept(excludes...)
    48  	}
    49  	includes := Split(include)
    50  	return InterceptOnly(includes...)
    51  }
    52  
    53  func InterceptAllExcept(values ...string) InterceptFilter {
    54  	return InterceptFilter{
    55  		Values: values,
    56  		Except: true,
    57  	}
    58  }
    59  
    60  func InterceptOnly(values ...string) InterceptFilter {
    61  	return InterceptFilter{
    62  		Values: values,
    63  		Except: false,
    64  	}
    65  }