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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 method provides utilities for working with request methods.
package method
import (
"encoding/json"
"fmt"
"net/http"
"github.com/google/martian/v3"
"github.com/google/martian/v3/parse"
"github.com/google/martian/v3/verify"
)
type verifier struct {
method string
err *martian.MultiError
}
type verifierJSON struct {
Method string `json:"method"`
Scope []parse.ModifierType `json:"scope"`
}
func init() {
parse.Register("method.Verifier", verifierFromJSON)
}
// NewVerifier returns a new method verifier.
func NewVerifier(method string) (verify.RequestVerifier, error) {
if method == "" {
return nil, fmt.Errorf("%s is not a valid HTTP method", method)
}
return &verifier{
method: method,
err: martian.NewMultiError(),
}, nil
}
// ModifyRequest verifies that the request's method matches the given method
// in all modified requests. An error will be added to the contained *MultiError
// if a method is unmatched.
func (v *verifier) ModifyRequest(req *http.Request) error {
m := req.Method
if v.method != "" && v.method != m {
err := fmt.Errorf("request(%v) method verification error: got %v, want %v", req.URL,
v.method, m)
v.err.Add(err)
}
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.err.Empty() {
return nil
}
return v.err
}
// ResetRequestVerifications clears all failed request verifications.
func (v *verifier) ResetRequestVerifications() {
v.err = martian.NewMultiError()
}
// verifierFromJSON builds a method.Verifier from JSON.
//
// Example JSON:
// {
// "method.Verifier": {
// "scope": ["request"],
// "method": "POST"
// }
// }
func verifierFromJSON(b []byte) (*parse.Result, error) {
msg := &verifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
v, err := NewVerifier(msg.Method)
if err != nil {
return nil, err
}
return parse.NewResult(v, msg.Scope)
}
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