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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 martianurl
-
- import (
- "encoding/json"
- "net/url"
-
- "github.com/google/martian"
- "github.com/google/martian/filter"
- "github.com/google/martian/log"
- "github.com/google/martian/parse"
- )
-
- var noop = martian.Noop("url.Filter")
-
- func init() {
- parse.Register("url.Filter", filterFromJSON)
- }
-
- // Filter runs modifiers iff the request URL matches all of the segments in url.
- type Filter struct {
- *filter.Filter
- }
-
- type filterJSON struct {
- Scheme string `json:"scheme"`
- Host string `json:"host"`
- Path string `json:"path"`
- Query string `json:"query"`
- Modifier json.RawMessage `json:"modifier"`
- ElseModifier json.RawMessage `json:"else"`
- Scope []parse.ModifierType `json:"scope"`
- }
-
- // NewFilter constructs a filter that applies the modifer when the
- // request URL matches all of the provided URL segments.
- func NewFilter(u *url.URL) *Filter {
- log.Debugf("martianurl.NewFilter: %s", u)
- m := NewMatcher(u)
- f := filter.New()
- f.SetRequestCondition(m)
- f.SetResponseCondition(m)
- return &Filter{f}
- }
-
- // filterFromJSON takes a JSON message as a byte slice and returns a
- // parse.Result that contains a URLFilter and a bitmask that represents the
- // type of modifier.
- //
- // Example JSON configuration message:
- // {
- // "scheme": "https",
- // "host": "example.com",
- // "path": "/foo/bar",
- // "query": "q=value",
- // "scope": ["request", "response"],
- // "modifier": { ... }
- // "else": { ... }
- // }
- func filterFromJSON(b []byte) (*parse.Result, error) {
- msg := &filterJSON{}
- if err := json.Unmarshal(b, msg); err != nil {
- return nil, err
- }
-
- filter := NewFilter(&url.URL{
- Scheme: msg.Scheme,
- Host: msg.Host,
- Path: msg.Path,
- RawQuery: msg.Query,
- })
-
- 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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