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Beego/policy.go

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// Copyright 2016 beego authors. 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 beego
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import (
"strings"
"github.com/astaxie/beego/context"
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)
// PolicyFunc defines a policy function which is invoked before the controller handler is executed.
type PolicyFunc func(*context.Context)
// FindPolicy Find Router info for URL
func (p *ControllerRegister) FindPolicy(cont *context.Context) []PolicyFunc {
var urlPath = cont.Input.URL()
if !BConfig.RouterCaseSensitive {
urlPath = strings.ToLower(urlPath)
}
httpMethod := cont.Input.Method()
isWildcard := false
// Find policy for current method
t, ok := p.policies[httpMethod]
// If not found - find policy for whole controller
if !ok {
t, ok = p.policies["*"]
isWildcard = true
}
if ok {
runObjects := t.Match(urlPath, cont)
if r, ok := runObjects.([]PolicyFunc); ok {
return r
} else if !isWildcard {
// If no policies found and we checked not for "*" method - try to find it
t, ok = p.policies["*"]
if ok {
runObjects = t.Match(urlPath, cont)
if r, ok = runObjects.([]PolicyFunc); ok {
return r
}
}
}
}
return nil
}
func (p *ControllerRegister) addToPolicy(method, pattern string, r ...PolicyFunc) {
method = strings.ToUpper(method)
p.enablePolicy = true
if !BConfig.RouterCaseSensitive {
pattern = strings.ToLower(pattern)
}
if t, ok := p.policies[method]; ok {
t.AddRouter(pattern, r)
} else {
t := NewTree()
t.AddRouter(pattern, r)
p.policies[method] = t
}
}
// Policy Register new policy in beego
func Policy(pattern, method string, policy ...PolicyFunc) {
BeeApp.Handlers.addToPolicy(method, pattern, policy...)
}
// Find policies and execute if were found
func (p *ControllerRegister) execPolicy(cont *context.Context, urlPath string) (started bool) {
if !p.enablePolicy {
return false
}
// Find Policy for method
policyList := p.FindPolicy(cont)
if len(policyList) > 0 {
// Run policies
for _, runPolicy := range policyList {
runPolicy(cont)
if cont.ResponseWriter.Started {
return true
}
}
return false
}
return false
}