github.com/google/martian/v3@v3.3.3/header/header_matcher.go (about)

     1  // Copyright 2015 Google Inc. All rights reserved.
     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 header
    16  
    17  import (
    18  	"net/http"
    19  
    20  	"github.com/google/martian/v3/proxyutil"
    21  )
    22  
    23  // Matcher is a conditonal evalutor of request or
    24  // response headers to be used in structs that take conditions.
    25  type Matcher struct {
    26  	name, value string
    27  }
    28  
    29  // NewMatcher builds a new header matcher.
    30  func NewMatcher(name, value string) *Matcher {
    31  	return &Matcher{
    32  		name:  name,
    33  		value: value,
    34  	}
    35  }
    36  
    37  // MatchRequest evaluates a request and returns whether or not
    38  // the request contains a header that matches the provided name
    39  // and value.
    40  func (m *Matcher) MatchRequest(req *http.Request) bool {
    41  	h := proxyutil.RequestHeader(req)
    42  
    43  	vs, ok := h.All(m.name)
    44  	if !ok {
    45  		return false
    46  	}
    47  
    48  	for _, v := range vs {
    49  		if v == m.value {
    50  			return true
    51  		}
    52  	}
    53  
    54  	return false
    55  }
    56  
    57  // MatchResponse evaluates a response and returns whether or not
    58  // the response contains a header that matches the provided name
    59  // and value.
    60  func (m *Matcher) MatchResponse(res *http.Response) bool {
    61  	h := proxyutil.ResponseHeader(res)
    62  
    63  	vs, ok := h.All(m.name)
    64  	if !ok {
    65  		return false
    66  	}
    67  
    68  	for _, v := range vs {
    69  		if v == m.value {
    70  			return true
    71  		}
    72  	}
    73  
    74  	return false
    75  }