mirror of
https://github.com/TeaOSLab/EdgeCommon.git
synced 2025-12-08 08:00:26 +08:00
127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
package serverconfigs
|
||
|
||
import (
|
||
"fmt"
|
||
"github.com/TeaOSLab/EdgeCommon/pkg/configutils"
|
||
"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/shared"
|
||
"regexp"
|
||
)
|
||
|
||
type HTTPRewriteMode = string
|
||
|
||
const (
|
||
HTTPRewriteTargetProxy = 1
|
||
HTTPRewriteTargetURL = 2
|
||
)
|
||
|
||
const (
|
||
HTTPRewriteModeRedirect HTTPRewriteMode = "redirect" // 跳转
|
||
HTTPRewriteModeProxy HTTPRewriteMode = "proxy" // 代理
|
||
)
|
||
|
||
// 重写规则定义
|
||
//
|
||
// 参考
|
||
// - http://nginx.org/en/docs/http/ngx_http_rewrite_module.html
|
||
// - https://httpd.apache.org/docs/current/mod/mod_rewrite.html
|
||
// - https://httpd.apache.org/docs/2.4/rewrite/flags.html
|
||
type HTTPRewriteRule struct {
|
||
Id int64 `yaml:"id" json:"id"` // ID
|
||
IsOn bool `yaml:"isOn" json:"isOn"` // 是否开启
|
||
|
||
// 开启的条件
|
||
// 语法为：cond param operator value 比如：
|
||
// - cond ${status} gte 200
|
||
// - cond ${arg.name} eq lily
|
||
// - cond ${requestPath} regexp .*\.png
|
||
CondGroups []*shared.HTTPRequestCondGroup `yaml:"condGroups" json:"condGroups"` // 匹配条件 TODO
|
||
|
||
// 规则
|
||
// 语法为：pattern regexp 比如：
|
||
// - pattern ^/article/(\d+).html
|
||
Pattern string `yaml:"pattern" json:"pattern"`
|
||
|
||
// 模式
|
||
Mode HTTPRewriteMode `yaml:"mode" json:"mode"`
|
||
RedirectStatus int `yaml:"redirectStatus" json:"redirectStatus"` // 跳转的状态码
|
||
ProxyHost string `yaml:"proxyHost" json:"proxyHost"` // 代理模式下的Host
|
||
|
||
// TODO 实现对其他代理服务的引用
|
||
|
||
// 要替换成的URL
|
||
// 支持反向引用：${0}, ${1}, ...，也支持?P<NAME>语法
|
||
// - 如果以 proxy:// 开头，表示目标为代理，首先会尝试作为代理ID请求，如果找不到，会尝试作为代理Host请求
|
||
Replace string `yaml:"replace" json:"replace"`
|
||
|
||
IsBreak bool `yaml:"isBreak" json:"isBreak"` // 终止向下解析
|
||
|
||
reg *regexp.Regexp
|
||
}
|
||
|
||
// 校验
|
||
func (this *HTTPRewriteRule) Init() error {
|
||
reg, err := regexp.Compile(this.Pattern)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
this.reg = reg
|
||
|
||
// 校验条件
|
||
for _, condGroup := range this.CondGroups {
|
||
err := condGroup.Init()
|
||
if err != nil {
|
||
return err
|
||
}
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// 对某个请求执行规则
|
||
func (this *HTTPRewriteRule) Match(requestPath string, formatter func(source string) string) (replace string, varMapping map[string]string, matched bool) {
|
||
if this.reg == nil {
|
||
return "", nil, false
|
||
}
|
||
|
||
matches := this.reg.FindStringSubmatch(requestPath)
|
||
if len(matches) == 0 {
|
||
return "", nil, false
|
||
}
|
||
|
||
// 判断条件
|
||
if len(this.CondGroups) > 0 {
|
||
for _, cond := range this.CondGroups {
|
||
if !cond.Match(formatter) {
|
||
return "", nil, false
|
||
}
|
||
}
|
||
}
|
||
|
||
varMapping = map[string]string{}
|
||
subNames := this.reg.SubexpNames()
|
||
for index, match := range matches {
|
||
varMapping[fmt.Sprintf("%d", index)] = match
|
||
subName := subNames[index]
|
||
if len(subName) > 0 {
|
||
varMapping[subName] = match
|
||
}
|
||
}
|
||
|
||
replace = configutils.ParseVariables(this.Replace, func(varName string) string {
|
||
v, ok := varMapping[varName]
|
||
if ok {
|
||
return v
|
||
}
|
||
return "${" + varName + "}"
|
||
})
|
||
|
||
replace = formatter(replace)
|
||
|
||
return replace, varMapping, true
|
||
}
|
||
|
||
// 判断是否是外部URL
|
||
func (this *HTTPRewriteRule) IsExternalURL(url string) bool {
|
||
return shared.RegexpExternalURL.MatchString(url)
|
||
}
|