80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
package utils
|
|
|
|
import (
|
|
"net/http"
|
|
"net/http/httputil"
|
|
"net/url"
|
|
"strings"
|
|
)
|
|
|
|
type httpUtil struct {
|
|
}
|
|
|
|
// Http 暴露接口
|
|
func Http() *httpUtil {
|
|
return &httpUtil{}
|
|
}
|
|
|
|
// NewProxy 重写创建代理函数，加入 Host 信息
|
|
func (hu httpUtil) NewProxy(target *url.URL) *httputil.ReverseProxy {
|
|
targetQuery := target.RawQuery
|
|
director := func(req *http.Request) {
|
|
req.Host = target.Host
|
|
req.URL.Scheme = target.Scheme
|
|
req.URL.Host = target.Host
|
|
req.URL.Path, req.URL.RawPath = hu.joinURLPath(target, req.URL)
|
|
// 过滤掉参数
|
|
if uri, err := url.Parse(req.URL.Path); err == nil {
|
|
req.URL.Path = uri.Path
|
|
}
|
|
|
|
var rawQuery string
|
|
if targetQuery == "" || req.URL.RawQuery == "" {
|
|
rawQuery = targetQuery + req.URL.RawQuery
|
|
} else {
|
|
rawQuery = targetQuery + "&" + req.URL.RawQuery
|
|
}
|
|
req.URL.RawQuery = rawQuery
|
|
if _, ok := req.Header["User-Agent"]; !ok {
|
|
// explicitly disable User-Agent so it's not set to default value
|
|
req.Header.Set("User-Agent", "")
|
|
}
|
|
// 补充内部调用Header
|
|
req.Header.Set("X-Request-From", "internal")
|
|
}
|
|
return &httputil.ReverseProxy{Director: director}
|
|
}
|
|
|
|
func (hu httpUtil) joinURLPath(a, b *url.URL) (path, rawpath string) {
|
|
if a.RawPath == "" && b.RawPath == "" {
|
|
return hu.singleJoiningSlash(a.Path, b.Path), ""
|
|
}
|
|
// Same as singleJoiningSlash, but uses EscapedPath to determine
|
|
// whether a slash should be added
|
|
apath := a.EscapedPath()
|
|
bpath := b.EscapedPath()
|
|
|
|
aslash := strings.HasSuffix(apath, "/")
|
|
bslash := strings.HasPrefix(bpath, "/")
|
|
|
|
switch {
|
|
case aslash && bslash:
|
|
return a.Path + b.Path[1:], apath + bpath[1:]
|
|
case !aslash && !bslash:
|
|
return a.Path + "/" + b.Path, apath + "/" + bpath
|
|
}
|
|
return a.Path + b.Path, apath + bpath
|
|
}
|
|
|
|
func (hu httpUtil) singleJoiningSlash(a, b string) string {
|
|
aslash := strings.HasSuffix(a, "/")
|
|
bslash := strings.HasPrefix(b, "/")
|
|
switch {
|
|
case aslash && bslash:
|
|
return a + b[1:]
|
|
case !aslash && !bslash:
|
|
return a + "/" + b
|
|
}
|
|
return a + b
|
|
}
|