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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 querystring
-
- import (
- "encoding/json"
-
- "github.com/google/martian"
- "github.com/google/martian/filter"
- "github.com/google/martian/parse"
- )
-
- var noop = martian.Noop("querystring.Filter")
-
- func init() {
- parse.Register("querystring.Filter", filterFromJSON)
- }
-
- // Filter runs modifiers iff the request query parameter for name matches 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"`
- }
-
- // NewFilter builds a querystring.Filter that filters on name and optionally
- // value.
- func NewFilter(name, value string) *Filter {
- m := NewMatcher(name, value)
- f := filter.New()
- f.SetRequestCondition(m)
- f.SetResponseCondition(m)
- return &Filter{f}
- }
-
- // filterFromJSON takes a JSON message and returns a querystring.Filter.
- //
- // Example JSON:
- // {
- // "name": "param",
- // "value": "example",
- // "scope": ["request", "response"],
- // "modifier": { ... }
- // }
- func filterFromJSON(b []byte) (*parse.Result, error) {
- msg := &filterJSON{}
- if err := json.Unmarshal(b, msg); err != nil {
- return nil, err
- }
-
- f := NewFilter(msg.Name, msg.Value)
-
- r, err := parse.FromJSON(msg.Modifier)
- if err != nil {
- return nil, err
- }
-
- f.RequestWhenTrue(r.RequestModifier())
- f.ResponseWhenTrue(r.ResponseModifier())
-
- if len(msg.ElseModifier) > 0 {
- em, err := parse.FromJSON(msg.ElseModifier)
- if err != nil {
- return nil, err
- }
-
- if em != nil {
- f.RequestWhenFalse(em.RequestModifier())
- f.ResponseWhenFalse(em.ResponseModifier())
- }
- }
-
- return parse.NewResult(f, msg.Scope)
- }
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