github.com/aacfactory/fns@v1.2.86-0.20240310083819-80d667fc0a17/transports/ip.go (about)

     1  /*
     2   * Copyright 2023 Wang Min Xiang
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * 	http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   *
    16   */
    17  
    18  package transports
    19  
    20  import (
    21  	"bytes"
    22  	"github.com/aacfactory/fns/commons/bytex"
    23  	"github.com/aacfactory/fns/commons/ipx"
    24  	"github.com/aacfactory/fns/context"
    25  	"net"
    26  )
    27  
    28  func DeviceIp(ctx context.Context) (ip []byte) {
    29  	r := LoadRequest(ctx)
    30  	if r == nil {
    31  		return
    32  	}
    33  	ip = r.Header().Get(DeviceIpHeaderName)
    34  	if len(ip) > 0 {
    35  		return
    36  	}
    37  	if trueClientIp := r.Header().Get(TrueClientIpHeaderName); len(trueClientIp) > 0 {
    38  		ip = trueClientIp
    39  	} else if realIp := r.Header().Get(XRealIpHeaderName); len(realIp) > 0 {
    40  		ip = realIp
    41  	} else if forwarded := r.Header().Get(XForwardedForHeaderName); len(forwarded) > 0 {
    42  		i := bytes.Index(forwarded, []byte{',', ' '})
    43  		if i == -1 {
    44  			i = len(forwarded)
    45  		}
    46  		ip = forwarded[:i]
    47  	} else {
    48  		remoteIp, _, remoteIpErr := net.SplitHostPort(bytex.ToString(r.RemoteAddr()))
    49  		if remoteIpErr != nil {
    50  			remoteIp = bytex.ToString(r.RemoteAddr())
    51  		}
    52  		ip = bytex.FromString(remoteIp)
    53  	}
    54  	ip = ipx.CanonicalizeIp(ip)
    55  	r.Header().Set(DeviceIpHeaderName, ip)
    56  	return
    57  }