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Beego/filter.go
2014-05-17 02:26:50 +08:00

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// Beego (http://beego.me/)
// @description beego is an open-source, high-performance web framework for the Go programming language.
// @link http://github.com/astaxie/beego for the canonical source repository
// @license http://github.com/astaxie/beego/blob/master/LICENSE
// @authors astaxie
package beego
import (
"regexp"
"strings"
)
// FilterRouter defines filter operation before controller handler execution.
// it can match patterned url and do filter function when action arrives.
type FilterRouter struct {
pattern string
regex *regexp.Regexp
filterFunc FilterFunc
hasregex bool
params map[int]string
parseParams map[string]string
}
// ValidRouter check current request is valid for this filter.
// if matched, returns parsed params in this request by defined filter router pattern.
func (mr *FilterRouter) ValidRouter(router string) (bool, map[string]string) {
if mr.pattern == "" {
return true, nil
}
if mr.pattern == "*" {
return true, nil
}
if router == mr.pattern {
return true, nil
}
//pattern /admin router /admin/ match
//pattern /admin/ router /admin don't match, because url will 301 in router
if n := len(router); n > 1 && router[n-1] == '/' && router[:n-2] == mr.pattern {
return true, nil
}
if mr.hasregex {
if !mr.regex.MatchString(router) {
return false, nil
}
matches := mr.regex.FindStringSubmatch(router)
if len(matches) > 0 {
if len(matches[0]) == len(router) {
params := make(map[string]string)
for i, match := range matches[1:] {
params[mr.params[i]] = match
}
return true, params
}
}
}
return false, nil
}
func buildFilter(pattern string, filter FilterFunc) (*FilterRouter, error) {
mr := new(FilterRouter)
mr.params = make(map[int]string)
mr.filterFunc = filter
parts := strings.Split(pattern, "/")
j := 0
for i, part := range parts {
if strings.HasPrefix(part, ":") {
expr := "(.*)"
//a user may choose to override the default expression
// similar to expressjs: /user/:id([0-9]+)
if index := strings.Index(part, "("); index != -1 {
expr = part[index:]
part = part[:index]
//match /user/:id:int ([0-9]+)
//match /post/:username:string ([\w]+)
} else if lindex := strings.LastIndex(part, ":"); lindex != 0 {
switch part[lindex:] {
case ":int":
expr = "([0-9]+)"
part = part[:lindex]
case ":string":
expr = `([\w]+)`
part = part[:lindex]
}
}
mr.params[j] = part
parts[i] = expr
j++
}
if strings.HasPrefix(part, "*") {
expr := "(.*)"
if part == "*.*" {
mr.params[j] = ":path"
parts[i] = "([^.]+).([^.]+)"
j++
mr.params[j] = ":ext"
j++
} else {
mr.params[j] = ":splat"
parts[i] = expr
j++
}
}
//url like someprefix:id(xxx).html
if strings.Contains(part, ":") && strings.Contains(part, "(") && strings.Contains(part, ")") {
var out []rune
var start bool
var startexp bool
var param []rune
var expt []rune
for _, v := range part {
if start {
if v != '(' {
param = append(param, v)
continue
}
}
if startexp {
if v != ')' {
expt = append(expt, v)
continue
}
}
if v == ':' {
param = make([]rune, 0)
param = append(param, ':')
start = true
} else if v == '(' {
startexp = true
start = false
mr.params[j] = string(param)
j++
expt = make([]rune, 0)
expt = append(expt, '(')
} else if v == ')' {
startexp = false
expt = append(expt, ')')
out = append(out, expt...)
} else {
out = append(out, v)
}
}
parts[i] = string(out)
}
}
if j != 0 {
pattern = strings.Join(parts, "/")
regex, regexErr := regexp.Compile(pattern)
if regexErr != nil {
return nil, regexErr
}
mr.regex = regex
mr.hasregex = true
}
mr.pattern = pattern
return mr, nil
}