mirror of
https://github.com/astaxie/beego.git
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106 lines
3.2 KiB
Go
106 lines
3.2 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package beego
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import (
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"strings"
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"github.com/astaxie/beego/pkg/context"
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)
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// FilterChain is different from pure FilterFunc
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// when you use this, you must invoke next(ctx) inside the FilterFunc which is returned
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// And all those FilterChain will be invoked before other FilterFunc
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type FilterChain func(next FilterFunc) FilterFunc
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// FilterFunc defines a filter function which is invoked before the controller handler is executed.
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type FilterFunc func(ctx *context.Context)
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// FilterRouter defines a filter operation which is invoked before the controller handler is executed.
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// It can match the URL against a pattern, and execute a filter function
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// when a request with a matching URL arrives.
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type FilterRouter struct {
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filterFunc FilterFunc
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next *FilterRouter
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tree *Tree
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pattern string
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returnOnOutput bool
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resetParams bool
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}
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// params is for:
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// 1. setting the returnOnOutput value (false allows multiple filters to execute)
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// 2. determining whether or not params need to be reset.
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func newFilterRouter(pattern string, routerCaseSensitive bool, filter FilterFunc, params ...bool) *FilterRouter {
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mr := &FilterRouter{
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tree: NewTree(),
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pattern: pattern,
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filterFunc: filter,
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returnOnOutput: true,
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}
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if !routerCaseSensitive {
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mr.pattern = strings.ToLower(pattern)
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}
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paramsLen := len(params)
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if paramsLen > 0 {
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mr.returnOnOutput = params[0]
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}
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if paramsLen > 1 {
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mr.resetParams = params[1]
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}
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mr.tree.AddRouter(pattern, true)
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return mr
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}
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// filter will check whether we need to execute the filter logic
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// return (started, done)
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func (f *FilterRouter) filter(ctx *context.Context, urlPath string, preFilterParams map[string]string) (bool, bool) {
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if f.returnOnOutput && ctx.ResponseWriter.Started {
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return true, true
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}
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if f.resetParams {
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preFilterParams = ctx.Input.Params()
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}
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if ok := f.ValidRouter(urlPath, ctx); ok {
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f.filterFunc(ctx)
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if f.resetParams {
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ctx.Input.ResetParams()
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for k, v := range preFilterParams {
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ctx.Input.SetParam(k, v)
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}
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}
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} else if f.next != nil {
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return f.next.filter(ctx, urlPath, preFilterParams)
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}
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if f.returnOnOutput && ctx.ResponseWriter.Started {
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return true, true
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}
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return false, false
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}
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// ValidRouter checks if the current request is matched by this filter.
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// If the request is matched, the values of the URL parameters defined
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// by the filter pattern are also returned.
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func (f *FilterRouter) ValidRouter(url string, ctx *context.Context) bool {
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isOk := f.tree.Match(url, ctx)
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if isOk != nil {
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if b, ok := isOk.(bool); ok {
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return b
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}
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}
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return false
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}
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