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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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