mirror of
https://github.com/dutchcoders/transfer.sh.git
synced 2020-11-18 19:53:40 -08:00
60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
// Copyright 2015 Google Inc. 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 header
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import (
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"net"
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"net/http"
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"github.com/google/martian"
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)
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// NewForwardedModifier sets the X-Forwarded-For, X-Forwarded-Proto,
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// X-Forwarded-Host, and X-Forwarded-Url headers.
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//
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// If X-Forwarded-For is already present, the client IP is appended to
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// the existing value. X-Forwarded-Proto, X-Forwarded-Host, and
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// X-Forwarded-Url are preserved if already present.
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//
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// TODO: Support "Forwarded" header.
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// see: http://tools.ietf.org/html/rfc7239
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func NewForwardedModifier() martian.RequestModifier {
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return martian.RequestModifierFunc(
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func(req *http.Request) error {
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if v := req.Header.Get("X-Forwarded-Proto"); v == "" {
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req.Header.Set("X-Forwarded-Proto", req.URL.Scheme)
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}
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if v := req.Header.Get("X-Forwarded-Host"); v == "" {
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req.Header.Set("X-Forwarded-Host", req.Host)
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}
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if v := req.Header.Get("X-Forwarded-Url"); v == "" {
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req.Header.Set("X-Forwarded-Url", req.URL.String())
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}
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xff, _, err := net.SplitHostPort(req.RemoteAddr)
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if err != nil {
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xff = req.RemoteAddr
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}
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if v := req.Header.Get("X-Forwarded-For"); v != "" {
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xff = v + ", " + xff
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}
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req.Header.Set("X-Forwarded-For", xff)
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return nil
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})
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}
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