mirror of
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104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package method provides utilities for verifying method type in martian.Proxy.
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package method
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/google/martian"
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"github.com/google/martian/parse"
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"github.com/google/martian/verify"
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)
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type verifier struct {
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method string
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err *martian.MultiError
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}
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type verifierJSON struct {
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Method string `json:"method"`
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Scope []parse.ModifierType `json:"scope"`
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}
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func init() {
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parse.Register("method.Verifier", verifierFromJSON)
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}
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// NewVerifier returns a new method verifier.
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func NewVerifier(method string) (verify.RequestVerifier, error) {
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if method == "" {
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return nil, fmt.Errorf("%s is not a valid HTTP method", method)
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}
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return &verifier{
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method: method,
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err: martian.NewMultiError(),
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}, nil
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}
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// ModifyRequest verifies that the request's method matches the given method
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// in all modified requests. An error will be added to the contained *MultiError
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// if a method is unmatched.
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func (v *verifier) ModifyRequest(req *http.Request) error {
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m := req.Method
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if v.method != "" && v.method != m {
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err := fmt.Errorf("request(%v) method verification error: got %v, want %v", req.URL,
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v.method, m)
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v.err.Add(err)
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}
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return nil
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}
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// VerifyRequests returns an error if verification for any request failed.
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// If an error is returned it will be of type *martian.MultiError.
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func (v *verifier) VerifyRequests() error {
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if v.err.Empty() {
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return nil
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}
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return v.err
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}
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// ResetRequestVerifications clears all failed request verifications.
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func (v *verifier) ResetRequestVerifications() {
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v.err = martian.NewMultiError()
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}
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// verifierFromJSON builds a method.Verifier from JSON.
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//
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// Example JSON:
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// {
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// "method.Verifier": {
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// "scope": ["request"],
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// "method": "POST"
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// }
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// }
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func verifierFromJSON(b []byte) (*parse.Result, error) {
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msg := &verifierJSON{}
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if err := json.Unmarshal(b, msg); err != nil {
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return nil, err
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}
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v, err := NewVerifier(msg.Method)
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if err != nil {
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return nil, err
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}
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return parse.NewResult(v, msg.Scope)
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}
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