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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
import (
"encoding/json"
"net/http"
"strings"
"github.com/google/martian/v3"
"github.com/google/martian/v3/filter"
"github.com/google/martian/v3/log"
"github.com/google/martian/v3/parse"
)
var noop = martian.Noop("method.Filter")
func init() {
parse.Register("method.Filter", filterFromJSON)
}
// Filter runs modifier iff the request method matches the specified method.
type Filter struct {
*filter.Filter
}
type filterJSON struct {
Method string `json:"method"`
Modifier json.RawMessage `json:"modifier"`
ElseModifier json.RawMessage `json:"else"`
Scope []parse.ModifierType `json:"scope"`
}
func filterFromJSON(b []byte) (*parse.Result, error) {
msg := &filterJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
filter := NewFilter(msg.Method)
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)
}
// NewFilter constructs a filter that applies the modifer when the
// request method matches meth.
func NewFilter(meth string) *Filter {
log.Debugf("method.NewFilter(%q)", meth)
m := NewMatcher(meth)
f := filter.New()
f.SetRequestCondition(m)
f.SetResponseCondition(m)
return &Filter{f}
}
// Matcher is a conditional evaluator of request methods to be used in
// filters that take conditionals.
type Matcher struct {
method string
}
// NewMatcher builds a new method matcher.
func NewMatcher(method string) *Matcher {
return &Matcher{
method: method,
}
}
// MatchRequest retuns true if m.method matches the request method.
func (m *Matcher) MatchRequest(req *http.Request) bool {
matched := m.matches(req.Method)
if matched {
log.Debugf("method.MatchRequest: matched %s request: %s", req.Method, req.URL)
}
return matched
}
// MatchResponse retuns true if m.method matches res.Request.Method.
func (m *Matcher) MatchResponse(res *http.Response) bool {
matched := m.matches(res.Request.Method)
if matched {
log.Debugf("method.MatchResponse: matched %s request: %s", res.Request.Method, res.Request.URL)
}
return matched
}
func (m *Matcher) matches(method string) bool {
return strings.EqualFold(method, m.method)
}
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