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// Copyright 2017 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 failure provides a verifier that always fails, adding a given message
// to the multierror log. This can be used to turn any filter in to a defacto
// verifier, by wrapping it in a filter and thus causing a verifier failure whenever
// a request passes the filter.
package failure
import (
"encoding/json"
"fmt"
"net/http"
"github.com/google/martian/v3"
"github.com/google/martian/v3/parse"
"github.com/google/martian/v3/verify"
)
func init() {
parse.Register("failure.Verifier", verifierFromJSON)
}
type verifier struct {
message string
merr *martian.MultiError
}
type verifierJSON struct {
Message string `json:"message"`
Scope []parse.ModifierType `json:"scope"`
}
// NewVerifier returns a new failing verifier.
func NewVerifier(message string) (verify.RequestVerifier, error) {
return &verifier{
message: message,
merr: martian.NewMultiError(),
}, nil
}
// ModifyRequest adds an error message containing the message field in the verifier to the verifier errors.
// This means that any time a request hits the verifier it's treated as an error.
func (v *verifier) ModifyRequest(req *http.Request) error {
err := fmt.Errorf("request(%v) verification error: %s", req.URL, v.message)
v.merr.Add(err)
return nil
}
// VerifyRequests returns an error if any requests have hit the verifier.
// If an error is returned it will be of type *martian.MultiError.
func (v *verifier) VerifyRequests() error {
if v.merr.Empty() {
return nil
}
return v.merr
}
// ResetRequestVerifications clears all failed request verifications.
func (v *verifier) ResetRequestVerifications() {
v.merr = martian.NewMultiError()
}
// verifierFromJSON builds a failure.Verifier from JSON
//
// Example JSON:
// {
// "failure.Verifier": {
// "scope": ["request", "response"],
// "message": "Request passed a filter it should not have"
// }
// }
func verifierFromJSON(b []byte) (*parse.Result, error) {
msg := &verifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
v, err := NewVerifier(msg.Message)
if err != nil {
return nil, err
}
return parse.NewResult(v, msg.Scope)
}
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