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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
import (
"encoding/json"
"net/http"
"github.com/google/martian/v3"
"github.com/google/martian/v3/filter"
"github.com/google/martian/v3/parse"
)
var noop = martian.Noop("header.Filter")
// Filter filters requests and responses based on header name and value.
type Filter struct {
*filter.Filter
}
type filterJSON struct {
Name string `json:"name"`
Value string `json:"value"`
Modifier json.RawMessage `json:"modifier"`
ElseModifier json.RawMessage `json:"else"`
Scope []parse.ModifierType `json:"scope"`
}
func init() {
parse.Register("header.Filter", filterFromJSON)
}
// NewFilter builds a new header filter.
func NewFilter(name, value string) *Filter {
m := NewMatcher(http.CanonicalHeaderKey(name), value)
f := filter.New()
f.SetRequestCondition(m)
f.SetResponseCondition(m)
return &Filter{f}
}
// filterFromJSON builds a header.Filter from JSON.
//
// Example JSON:
// {
// "scope": ["request", "result"],
// "name": "Martian-Testing",
// "value": "true",
// "modifier": { ... },
// "else": { ... }
// }
func filterFromJSON(b []byte) (*parse.Result, error) {
msg := &filterJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
filter := NewFilter(msg.Name, msg.Value)
m, err := parse.FromJSON(msg.Modifier)
if err != nil {
return nil, err
}
filter.RequestWhenTrue(m.RequestModifier())
filter.ResponseWhenTrue(m.ResponseModifier())
if len(msg.ElseModifier) > 0 {
em, err := parse.FromJSON(msg.ElseModifier)
if err != nil {
return nil, err
}
if em != nil {
filter.RequestWhenFalse(em.RequestModifier())
filter.ResponseWhenFalse(em.ResponseModifier())
}
}
return parse.NewResult(filter, msg.Scope)
}
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