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header_verifier.go
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/
header_verifier.go
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// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package header provides utilities for modifying, filtering, and
// verifying headers in martian.Proxy.
package header
import (
"encoding/json"
"fmt"
"net/http"
"strings"
"github.com/google/martian"
"github.com/google/martian/parse"
"github.com/google/martian/proxyutil"
"github.com/google/martian/verify"
)
const (
headerErrFormat = "%s(%s) header verify failure: got no header, want %s header"
valueErrFormat = "%s(%s) header verify failure: got %s with value %s, want value %s"
)
type verifier struct {
name, value string
reqerr *martian.MultiError
reserr *martian.MultiError
}
type verifierJSON struct {
Name string `json:"name"`
Value string `json:"value"`
Scope []parse.ModifierType `json:"scope"`
}
func init() {
parse.Register("header.Verifier", verifierFromJSON)
}
// NewVerifier creates a new header verifier for the given name and value.
func NewVerifier(name, value string) verify.RequestResponseVerifier {
return &verifier{
name: name,
value: value,
reqerr: martian.NewMultiError(),
reserr: martian.NewMultiError(),
}
}
// ModifyRequest verifies that the header for name is present in all modified
// requests. If value is non-empty the value must be present in at least one
// header for name. An error will be added to the contained *MultiError for
// every unmatched request.
func (v *verifier) ModifyRequest(req *http.Request) error {
h := proxyutil.RequestHeader(req)
vs, ok := h.All(v.name)
if !ok {
v.reqerr.Add(fmt.Errorf(headerErrFormat, "request", req.URL, v.name))
return nil
}
for _, value := range vs {
switch v.value {
case "", value:
return nil
}
}
v.reqerr.Add(fmt.Errorf(valueErrFormat, "request", req.URL, v.name,
strings.Join(vs, ", "), v.value))
return nil
}
// ModifyResponse verifies that the header for name is present in all modified
// responses. If value is non-empty the value must be present in at least one
// header for name. An error will be added to the contained *MultiError for
// every unmatched response.
func (v *verifier) ModifyResponse(res *http.Response) error {
h := proxyutil.ResponseHeader(res)
vs, ok := h.All(v.name)
if !ok {
v.reserr.Add(fmt.Errorf(headerErrFormat, "response", res.Request.URL, v.name))
return nil
}
for _, value := range vs {
switch v.value {
case "", value:
return nil
}
}
v.reserr.Add(fmt.Errorf(valueErrFormat, "response", res.Request.URL, v.name,
strings.Join(vs, ", "), v.value))
return nil
}
// VerifyRequests returns an error if verification for any request failed.
// If an error is returned it will be of type *martian.MultiError.
func (v *verifier) VerifyRequests() error {
if v.reqerr.Empty() {
return nil
}
return v.reqerr
}
// VerifyResponses returns an error if verification for any request failed.
// If an error is returned it will be of type *martian.MultiError.
func (v *verifier) VerifyResponses() error {
if v.reserr.Empty() {
return nil
}
return v.reserr
}
// ResetRequestVerifications clears all failed request verifications.
func (v *verifier) ResetRequestVerifications() {
v.reqerr = martian.NewMultiError()
}
// ResetResponseVerifications clears all failed response verifications.
func (v *verifier) ResetResponseVerifications() {
v.reserr = martian.NewMultiError()
}
// verifierFromJSON builds a header.Verifier from JSON.
//
// Example JSON:
// {
// "name": "header.Verifier",
// "scope": ["request", "result"],
// "modifier": {
// "name": "Martian-Testing",
// "value": "true"
// }
// }
func verifierFromJSON(b []byte) (*parse.Result, error) {
msg := &verifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
return parse.NewResult(NewVerifier(msg.Name, msg.Value), msg.Scope)
}