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-rw-r--r--vendor/github.com/gorilla/handlers/.travis.yml8
-rw-r--r--vendor/github.com/gorilla/handlers/LICENSE22
-rw-r--r--vendor/github.com/gorilla/handlers/README.md52
-rw-r--r--vendor/github.com/gorilla/handlers/canonical.go71
-rw-r--r--vendor/github.com/gorilla/handlers/compress.go84
-rw-r--r--vendor/github.com/gorilla/handlers/doc.go9
-rw-r--r--vendor/github.com/gorilla/handlers/handlers.go378
-rw-r--r--vendor/github.com/gorilla/handlers/proxy_headers.go113
8 files changed, 737 insertions, 0 deletions
diff --git a/vendor/github.com/gorilla/handlers/.travis.yml b/vendor/github.com/gorilla/handlers/.travis.yml
new file mode 100644
index 000000000..354b7f8b2
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/.travis.yml
@@ -0,0 +1,8 @@
+language: go
+
+go:
+ - 1.1
+ - 1.2
+ - 1.3
+ - 1.4
+ - tip
diff --git a/vendor/github.com/gorilla/handlers/LICENSE b/vendor/github.com/gorilla/handlers/LICENSE
new file mode 100644
index 000000000..66ea3c8ae
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/LICENSE
@@ -0,0 +1,22 @@
+Copyright (c) 2013 The Gorilla Handlers Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+ Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/gorilla/handlers/README.md b/vendor/github.com/gorilla/handlers/README.md
new file mode 100644
index 000000000..a340abe08
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/README.md
@@ -0,0 +1,52 @@
+gorilla/handlers
+================
+[![GoDoc](https://godoc.org/github.com/gorilla/handlers?status.svg)](https://godoc.org/github.com/gorilla/handlers) [![Build Status](https://travis-ci.org/gorilla/handlers.svg?branch=master)](https://travis-ci.org/gorilla/handlers)
+
+Package handlers is a collection of handlers (aka "HTTP middleware") for use
+with Go's `net/http` package (or any framework supporting `http.Handler`), including:
+
+* `LoggingHandler` for logging HTTP requests in the Apache [Common Log
+ Format](http://httpd.apache.org/docs/2.2/logs.html#common).
+* `CombinedLoggingHandler` for logging HTTP requests in the Apache [Combined Log
+ Format](http://httpd.apache.org/docs/2.2/logs.html#combined) commonly used by
+ both Apache and nginx.
+* `CompressHandler` for gzipping responses.
+* `ContentTypeHandler` for validating requests against a list of accepted
+ content types.
+* `MethodHandler` for matching HTTP methods against handlers in a
+ `map[string]http.Handler`
+* `ProxyHeaders` for populating `r.RemoteAddr` and `r.URL.Scheme` based on the
+ `X-Forwarded-For`, `X-Real-IP`, `X-Forwarded-Proto` and RFC7239 `Forwarded`
+ headers when running a Go server behind a HTTP reverse proxy.
+* `CanonicalHost` for re-directing to the preferred host when handling multiple
+ domains (i.e. multiple CNAME aliases).
+
+Other handlers are documented [on the Gorilla
+website](http://www.gorillatoolkit.org/pkg/handlers).
+
+## Example
+
+A simple example using `handlers.LoggingHandler` and `handlers.CompressHandler`:
+
+```go
+import (
+ "net/http"
+ "github.com/gorilla/handlers"
+)
+
+func main() {
+ r := http.NewServeMux()
+
+ // Only log requests to our admin dashboard to stdout
+ r.Handle("/admin", handlers.LoggingHandler(os.Stdout, http.HandlerFunc(ShowAdminDashboard)))
+ r.HandleFunc("/", ShowIndex)
+
+ // Wrap our server with our gzip handler to gzip compress all responses.
+ http.ListenAndServe(":8000", handlers.CompressHandler(r))
+}
+```
+
+## License
+
+BSD licensed. See the included LICENSE file for details.
+
diff --git a/vendor/github.com/gorilla/handlers/canonical.go b/vendor/github.com/gorilla/handlers/canonical.go
new file mode 100644
index 000000000..3961695c4
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/canonical.go
@@ -0,0 +1,71 @@
+package handlers
+
+import (
+ "net/http"
+ "net/url"
+ "strings"
+)
+
+type canonical struct {
+ h http.Handler
+ domain string
+ code int
+}
+
+// CanonicalHost is HTTP middleware that re-directs requests to the canonical
+// domain. It accepts a domain and a status code (e.g. 301 or 302) and
+// re-directs clients to this domain. The existing request path is maintained.
+//
+// Note: If the provided domain is considered invalid by url.Parse or otherwise
+// returns an empty scheme or host, clients are not re-directed.
+// not re-directed.
+//
+// Example:
+//
+// r := mux.NewRouter()
+// canonical := handlers.CanonicalHost("http://www.gorillatoolkit.org", 302)
+// r.HandleFunc("/route", YourHandler)
+//
+// log.Fatal(http.ListenAndServe(":7000", canonical(r)))
+//
+func CanonicalHost(domain string, code int) func(h http.Handler) http.Handler {
+ fn := func(h http.Handler) http.Handler {
+ return canonical{h, domain, code}
+ }
+
+ return fn
+}
+
+func (c canonical) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ dest, err := url.Parse(c.domain)
+ if err != nil {
+ // Call the next handler if the provided domain fails to parse.
+ c.h.ServeHTTP(w, r)
+ return
+ }
+
+ if dest.Scheme == "" || dest.Host == "" {
+ // Call the next handler if the scheme or host are empty.
+ // Note that url.Parse won't fail on in this case.
+ c.h.ServeHTTP(w, r)
+ return
+ }
+
+ if !strings.EqualFold(cleanHost(r.Host), dest.Host) {
+ // Re-build the destination URL
+ dest := dest.Scheme + "://" + dest.Host + r.URL.Path
+ http.Redirect(w, r, dest, c.code)
+ }
+
+ c.h.ServeHTTP(w, r)
+}
+
+// cleanHost cleans invalid Host headers by stripping anything after '/' or ' '.
+// This is backported from Go 1.5 (in response to issue #11206) and attempts to
+// mitigate malformed Host headers that do not match the format in RFC7230.
+func cleanHost(in string) string {
+ if i := strings.IndexAny(in, " /"); i != -1 {
+ return in[:i]
+ }
+ return in
+}
diff --git a/vendor/github.com/gorilla/handlers/compress.go b/vendor/github.com/gorilla/handlers/compress.go
new file mode 100644
index 000000000..3d90e1914
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/compress.go
@@ -0,0 +1,84 @@
+// Copyright 2013 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package handlers
+
+import (
+ "compress/flate"
+ "compress/gzip"
+ "io"
+ "net/http"
+ "strings"
+)
+
+type compressResponseWriter struct {
+ io.Writer
+ http.ResponseWriter
+ http.Hijacker
+}
+
+func (w *compressResponseWriter) Header() http.Header {
+ return w.ResponseWriter.Header()
+}
+
+func (w *compressResponseWriter) Write(b []byte) (int, error) {
+ h := w.ResponseWriter.Header()
+ if h.Get("Content-Type") == "" {
+ h.Set("Content-Type", http.DetectContentType(b))
+ }
+
+ return w.Writer.Write(b)
+}
+
+// CompressHandler gzip compresses HTTP responses for clients that support it
+// via the 'Accept-Encoding' header.
+func CompressHandler(h http.Handler) http.Handler {
+ return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+ L:
+ for _, enc := range strings.Split(r.Header.Get("Accept-Encoding"), ",") {
+ switch strings.TrimSpace(enc) {
+ case "gzip":
+ w.Header().Set("Content-Encoding", "gzip")
+ w.Header().Add("Vary", "Accept-Encoding")
+
+ gw := gzip.NewWriter(w)
+ defer gw.Close()
+
+ h, hok := w.(http.Hijacker)
+ if !hok { /* w is not Hijacker... oh well... */
+ h = nil
+ }
+
+ w = &compressResponseWriter{
+ Writer: gw,
+ ResponseWriter: w,
+ Hijacker: h,
+ }
+
+ break L
+ case "deflate":
+ w.Header().Set("Content-Encoding", "deflate")
+ w.Header().Add("Vary", "Accept-Encoding")
+
+ fw, _ := flate.NewWriter(w, flate.DefaultCompression)
+ defer fw.Close()
+
+ h, hok := w.(http.Hijacker)
+ if !hok { /* w is not Hijacker... oh well... */
+ h = nil
+ }
+
+ w = &compressResponseWriter{
+ Writer: fw,
+ ResponseWriter: w,
+ Hijacker: h,
+ }
+
+ break L
+ }
+ }
+
+ h.ServeHTTP(w, r)
+ })
+}
diff --git a/vendor/github.com/gorilla/handlers/doc.go b/vendor/github.com/gorilla/handlers/doc.go
new file mode 100644
index 000000000..944e5a8ae
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/doc.go
@@ -0,0 +1,9 @@
+/*
+Package handlers is a collection of handlers (aka "HTTP middleware") for use
+with Go's net/http package (or any framework supporting http.Handler).
+
+The package includes handlers for logging in standardised formats, compressing
+HTTP responses, validating content types and other useful tools for manipulating
+requests and responses.
+*/
+package handlers
diff --git a/vendor/github.com/gorilla/handlers/handlers.go b/vendor/github.com/gorilla/handlers/handlers.go
new file mode 100644
index 000000000..c3c20e5b9
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/handlers.go
@@ -0,0 +1,378 @@
+// Copyright 2013 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package handlers
+
+import (
+ "bufio"
+ "fmt"
+ "io"
+ "net"
+ "net/http"
+ "net/url"
+ "sort"
+ "strconv"
+ "strings"
+ "time"
+ "unicode/utf8"
+)
+
+// MethodHandler is an http.Handler that dispatches to a handler whose key in the MethodHandler's
+// map matches the name of the HTTP request's method, eg: GET
+//
+// If the request's method is OPTIONS and OPTIONS is not a key in the map then the handler
+// responds with a status of 200 and sets the Allow header to a comma-separated list of
+// available methods.
+//
+// If the request's method doesn't match any of its keys the handler responds with
+// a status of 405, Method not allowed and sets the Allow header to a comma-separated list
+// of available methods.
+type MethodHandler map[string]http.Handler
+
+func (h MethodHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+ if handler, ok := h[req.Method]; ok {
+ handler.ServeHTTP(w, req)
+ } else {
+ allow := []string{}
+ for k := range h {
+ allow = append(allow, k)
+ }
+ sort.Strings(allow)
+ w.Header().Set("Allow", strings.Join(allow, ", "))
+ if req.Method == "OPTIONS" {
+ w.WriteHeader(http.StatusOK)
+ } else {
+ http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+ }
+ }
+}
+
+// loggingHandler is the http.Handler implementation for LoggingHandlerTo and its friends
+type loggingHandler struct {
+ writer io.Writer
+ handler http.Handler
+}
+
+// combinedLoggingHandler is the http.Handler implementation for LoggingHandlerTo and its friends
+type combinedLoggingHandler struct {
+ writer io.Writer
+ handler http.Handler
+}
+
+func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+ t := time.Now()
+ logger := makeLogger(w)
+ url := *req.URL
+ h.handler.ServeHTTP(logger, req)
+ writeLog(h.writer, req, url, t, logger.Status(), logger.Size())
+}
+
+func (h combinedLoggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+ t := time.Now()
+ logger := makeLogger(w)
+ url := *req.URL
+ h.handler.ServeHTTP(logger, req)
+ writeCombinedLog(h.writer, req, url, t, logger.Status(), logger.Size())
+}
+
+func makeLogger(w http.ResponseWriter) loggingResponseWriter {
+ var logger loggingResponseWriter = &responseLogger{w: w}
+ if _, ok := w.(http.Hijacker); ok {
+ logger = &hijackLogger{responseLogger{w: w}}
+ }
+ h, ok1 := logger.(http.Hijacker)
+ c, ok2 := w.(http.CloseNotifier)
+ if ok1 && ok2 {
+ return hijackCloseNotifier{logger, h, c}
+ }
+ if ok2 {
+ return &closeNotifyWriter{logger, c}
+ }
+ return logger
+}
+
+type loggingResponseWriter interface {
+ http.ResponseWriter
+ http.Flusher
+ Status() int
+ Size() int
+}
+
+// responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP status
+// code and body size
+type responseLogger struct {
+ w http.ResponseWriter
+ status int
+ size int
+}
+
+func (l *responseLogger) Header() http.Header {
+ return l.w.Header()
+}
+
+func (l *responseLogger) Write(b []byte) (int, error) {
+ if l.status == 0 {
+ // The status will be StatusOK if WriteHeader has not been called yet
+ l.status = http.StatusOK
+ }
+ size, err := l.w.Write(b)
+ l.size += size
+ return size, err
+}
+
+func (l *responseLogger) WriteHeader(s int) {
+ l.w.WriteHeader(s)
+ l.status = s
+}
+
+func (l *responseLogger) Status() int {
+ return l.status
+}
+
+func (l *responseLogger) Size() int {
+ return l.size
+}
+
+func (l *responseLogger) Flush() {
+ f, ok := l.w.(http.Flusher)
+ if ok {
+ f.Flush()
+ }
+}
+
+type hijackLogger struct {
+ responseLogger
+}
+
+func (l *hijackLogger) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+ h := l.responseLogger.w.(http.Hijacker)
+ conn, rw, err := h.Hijack()
+ if err == nil && l.responseLogger.status == 0 {
+ // The status will be StatusSwitchingProtocols if there was no error and WriteHeader has not been called yet
+ l.responseLogger.status = http.StatusSwitchingProtocols
+ }
+ return conn, rw, err
+}
+
+type closeNotifyWriter struct {
+ loggingResponseWriter
+ http.CloseNotifier
+}
+
+type hijackCloseNotifier struct {
+ loggingResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+}
+
+const lowerhex = "0123456789abcdef"
+
+func appendQuoted(buf []byte, s string) []byte {
+ var runeTmp [utf8.UTFMax]byte
+ for width := 0; len(s) > 0; s = s[width:] {
+ r := rune(s[0])
+ width = 1
+ if r >= utf8.RuneSelf {
+ r, width = utf8.DecodeRuneInString(s)
+ }
+ if width == 1 && r == utf8.RuneError {
+ buf = append(buf, `\x`...)
+ buf = append(buf, lowerhex[s[0]>>4])
+ buf = append(buf, lowerhex[s[0]&0xF])
+ continue
+ }
+ if r == rune('"') || r == '\\' { // always backslashed
+ buf = append(buf, '\\')
+ buf = append(buf, byte(r))
+ continue
+ }
+ if strconv.IsPrint(r) {
+ n := utf8.EncodeRune(runeTmp[:], r)
+ buf = append(buf, runeTmp[:n]...)
+ continue
+ }
+ switch r {
+ case '\a':
+ buf = append(buf, `\a`...)
+ case '\b':
+ buf = append(buf, `\b`...)
+ case '\f':
+ buf = append(buf, `\f`...)
+ case '\n':
+ buf = append(buf, `\n`...)
+ case '\r':
+ buf = append(buf, `\r`...)
+ case '\t':
+ buf = append(buf, `\t`...)
+ case '\v':
+ buf = append(buf, `\v`...)
+ default:
+ switch {
+ case r < ' ':
+ buf = append(buf, `\x`...)
+ buf = append(buf, lowerhex[s[0]>>4])
+ buf = append(buf, lowerhex[s[0]&0xF])
+ case r > utf8.MaxRune:
+ r = 0xFFFD
+ fallthrough
+ case r < 0x10000:
+ buf = append(buf, `\u`...)
+ for s := 12; s >= 0; s -= 4 {
+ buf = append(buf, lowerhex[r>>uint(s)&0xF])
+ }
+ default:
+ buf = append(buf, `\U`...)
+ for s := 28; s >= 0; s -= 4 {
+ buf = append(buf, lowerhex[r>>uint(s)&0xF])
+ }
+ }
+ }
+ }
+ return buf
+
+}
+
+// buildCommonLogLine builds a log entry for req in Apache Common Log Format.
+// ts is the timestamp with which the entry should be logged.
+// status and size are used to provide the response HTTP status and size.
+func buildCommonLogLine(req *http.Request, url url.URL, ts time.Time, status int, size int) []byte {
+ username := "-"
+ if url.User != nil {
+ if name := url.User.Username(); name != "" {
+ username = name
+ }
+ }
+
+ host, _, err := net.SplitHostPort(req.RemoteAddr)
+
+ if err != nil {
+ host = req.RemoteAddr
+ }
+
+ uri := url.RequestURI()
+
+ buf := make([]byte, 0, 3*(len(host)+len(username)+len(req.Method)+len(uri)+len(req.Proto)+50)/2)
+ buf = append(buf, host...)
+ buf = append(buf, " - "...)
+ buf = append(buf, username...)
+ buf = append(buf, " ["...)
+ buf = append(buf, ts.Format("02/Jan/2006:15:04:05 -0700")...)
+ buf = append(buf, `] "`...)
+ buf = append(buf, req.Method...)
+ buf = append(buf, " "...)
+ buf = appendQuoted(buf, uri)
+ buf = append(buf, " "...)
+ buf = append(buf, req.Proto...)
+ buf = append(buf, `" `...)
+ buf = append(buf, strconv.Itoa(status)...)
+ buf = append(buf, " "...)
+ buf = append(buf, strconv.Itoa(size)...)
+ return buf
+}
+
+// writeLog writes a log entry for req to w in Apache Common Log Format.
+// ts is the timestamp with which the entry should be logged.
+// status and size are used to provide the response HTTP status and size.
+func writeLog(w io.Writer, req *http.Request, url url.URL, ts time.Time, status, size int) {
+ buf := buildCommonLogLine(req, url, ts, status, size)
+ buf = append(buf, '\n')
+ w.Write(buf)
+}
+
+// writeCombinedLog writes a log entry for req to w in Apache Combined Log Format.
+// ts is the timestamp with which the entry should be logged.
+// status and size are used to provide the response HTTP status and size.
+func writeCombinedLog(w io.Writer, req *http.Request, url url.URL, ts time.Time, status, size int) {
+ buf := buildCommonLogLine(req, url, ts, status, size)
+ buf = append(buf, ` "`...)
+ buf = appendQuoted(buf, req.Referer())
+ buf = append(buf, `" "`...)
+ buf = appendQuoted(buf, req.UserAgent())
+ buf = append(buf, '"', '\n')
+ w.Write(buf)
+}
+
+// CombinedLoggingHandler return a http.Handler that wraps h and logs requests to out in
+// Apache Combined Log Format.
+//
+// See http://httpd.apache.org/docs/2.2/logs.html#combined for a description of this format.
+//
+// LoggingHandler always sets the ident field of the log to -
+func CombinedLoggingHandler(out io.Writer, h http.Handler) http.Handler {
+ return combinedLoggingHandler{out, h}
+}
+
+// LoggingHandler return a http.Handler that wraps h and logs requests to out in
+// Apache Common Log Format (CLF).
+//
+// See http://httpd.apache.org/docs/2.2/logs.html#common for a description of this format.
+//
+// LoggingHandler always sets the ident field of the log to -
+func LoggingHandler(out io.Writer, h http.Handler) http.Handler {
+ return loggingHandler{out, h}
+}
+
+// isContentType validates the Content-Type header
+// is contentType. That is, its type and subtype match.
+func isContentType(h http.Header, contentType string) bool {
+ ct := h.Get("Content-Type")
+ if i := strings.IndexRune(ct, ';'); i != -1 {
+ ct = ct[0:i]
+ }
+ return ct == contentType
+}
+
+// ContentTypeHandler wraps and returns a http.Handler, validating the request content type
+// is acompatible with the contentTypes list.
+// It writes a HTTP 415 error if that fails.
+//
+// Only PUT, POST, and PATCH requests are considered.
+func ContentTypeHandler(h http.Handler, contentTypes ...string) http.Handler {
+ return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+ if !(r.Method == "PUT" || r.Method == "POST" || r.Method == "PATCH") {
+ h.ServeHTTP(w, r)
+ return
+ }
+
+ for _, ct := range contentTypes {
+ if isContentType(r.Header, ct) {
+ h.ServeHTTP(w, r)
+ return
+ }
+ }
+ http.Error(w, fmt.Sprintf("Unsupported content type %q; expected one of %q", r.Header.Get("Content-Type"), contentTypes), http.StatusUnsupportedMediaType)
+ })
+}
+
+const (
+ // HTTPMethodOverrideHeader is a commonly used
+ // http header to override a request method.
+ HTTPMethodOverrideHeader = "X-HTTP-Method-Override"
+ // HTTPMethodOverrideFormKey is a commonly used
+ // HTML form key to override a request method.
+ HTTPMethodOverrideFormKey = "_method"
+)
+
+// HTTPMethodOverrideHandler wraps and returns a http.Handler which checks for the X-HTTP-Method-Override header
+// or the _method form key, and overrides (if valid) request.Method with its value.
+//
+// This is especially useful for http clients that don't support many http verbs.
+// It isn't secure to override e.g a GET to a POST, so only POST requests are considered.
+// Likewise, the override method can only be a "write" method: PUT, PATCH or DELETE.
+//
+// Form method takes precedence over header method.
+func HTTPMethodOverrideHandler(h http.Handler) http.Handler {
+ return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+ if r.Method == "POST" {
+ om := r.FormValue(HTTPMethodOverrideFormKey)
+ if om == "" {
+ om = r.Header.Get(HTTPMethodOverrideHeader)
+ }
+ if om == "PUT" || om == "PATCH" || om == "DELETE" {
+ r.Method = om
+ }
+ }
+ h.ServeHTTP(w, r)
+ })
+}
diff --git a/vendor/github.com/gorilla/handlers/proxy_headers.go b/vendor/github.com/gorilla/handlers/proxy_headers.go
new file mode 100644
index 000000000..268de9c6a
--- /dev/null
+++ b/vendor/github.com/gorilla/handlers/proxy_headers.go
@@ -0,0 +1,113 @@
+package handlers
+
+import (
+ "net/http"
+ "regexp"
+ "strings"
+)
+
+var (
+ // De-facto standard header keys.
+ xForwardedFor = http.CanonicalHeaderKey("X-Forwarded-For")
+ xRealIP = http.CanonicalHeaderKey("X-Real-IP")
+ xForwardedProto = http.CanonicalHeaderKey("X-Forwarded-Scheme")
+)
+
+var (
+ // RFC7239 defines a new "Forwarded: " header designed to replace the
+ // existing use of X-Forwarded-* headers.
+ // e.g. Forwarded: for=192.0.2.60;proto=https;by=203.0.113.43
+ forwarded = http.CanonicalHeaderKey("Forwarded")
+ // Allows for a sub-match of the first value after 'for=' to the next
+ // comma, semi-colon or space. The match is case-insensitive.
+ forRegex = regexp.MustCompile(`(?i)(?:for=)([^(;|,| )]+)`)
+ // Allows for a sub-match for the first instance of scheme (http|https)
+ // prefixed by 'proto='. The match is case-insensitive.
+ protoRegex = regexp.MustCompile(`(?i)(?:proto=)(https|http)`)
+)
+
+// ProxyHeaders inspects common reverse proxy headers and sets the corresponding
+// fields in the HTTP request struct. These are X-Forwarded-For and X-Real-IP
+// for the remote (client) IP address, X-Forwarded-Proto for the scheme
+// (http|https) and the RFC7239 Forwarded header, which may include both client
+// IPs and schemes.
+//
+// NOTE: This middleware should only be used when behind a reverse
+// proxy like nginx, HAProxy or Apache. Reverse proxies that don't (or are
+// configured not to) strip these headers from client requests, or where these
+// headers are accepted "as is" from a remote client (e.g. when Go is not behind
+// a proxy), can manifest as a vulnerability if your application uses these
+// headers for validating the 'trustworthiness' of a request.
+func ProxyHeaders(h http.Handler) http.Handler {
+ fn := func(w http.ResponseWriter, r *http.Request) {
+ // Set the remote IP with the value passed from the proxy.
+ if fwd := getIP(r); fwd != "" {
+ r.RemoteAddr = fwd
+ }
+
+ // Set the scheme (proto) with the value passed from the proxy.
+ if scheme := getScheme(r); scheme != "" {
+ r.URL.Scheme = scheme
+ }
+
+ // Call the next handler in the chain.
+ h.ServeHTTP(w, r)
+ }
+
+ return http.HandlerFunc(fn)
+}
+
+// getIP retrieves the IP from the X-Forwarded-For, X-Real-IP and RFC7239
+// Forwarded headers (in that order).
+func getIP(r *http.Request) string {
+ var addr string
+
+ if fwd := r.Header.Get(xForwardedFor); fwd != "" {
+ // Only grab the first (client) address. Note that '192.168.0.1,
+ // 10.1.1.1' is a valid key for X-Forwarded-For where addresses after
+ // the first may represent forwarding proxies earlier in the chain.
+ s := strings.Index(fwd, ", ")
+ if s == -1 {
+ s = len(fwd)
+ }
+ addr = fwd[:s]
+ } else if fwd := r.Header.Get(xRealIP); fwd != "" {
+ // X-Real-IP should only contain one IP address (the client making the
+ // request).
+ addr = fwd
+ } else if fwd := r.Header.Get(forwarded); fwd != "" {
+ // match should contain at least two elements if the protocol was
+ // specified in the Forwarded header. The first element will always be
+ // the 'for=' capture, which we ignore. In the case of multiple IP
+ // addresses (for=8.8.8.8, 8.8.4.4,172.16.1.20 is valid) we only
+ // extract the first, which should be the client IP.
+ if match := forRegex.FindStringSubmatch(fwd); len(match) > 1 {
+ // IPv6 addresses in Forwarded headers are quoted-strings. We strip
+ // these quotes.
+ addr = strings.Trim(match[1], `"`)
+ }
+ }
+
+ return addr
+}
+
+// getScheme retrieves the scheme from the X-Forwarded-Proto and RFC7239
+// Forwarded headers (in that order).
+func getScheme(r *http.Request) string {
+ var scheme string
+
+ // Retrieve the scheme from X-Forwarded-Proto.
+ if proto := r.Header.Get(xForwardedProto); proto != "" {
+ scheme = strings.ToLower(proto)
+ } else if proto := r.Header.Get(forwarded); proto != "" {
+ // match should contain at least two elements if the protocol was
+ // specified in the Forwarded header. The first element will always be
+ // the 'proto=' capture, which we ignore. In the case of multiple proto
+ // parameters (invalid) we only extract the first.
+ if match := protoRegex.FindStringSubmatch(proto); len(match) > 1 {
+ scheme = strings.ToLower(match[1])
+ }
+ }
+
+ return scheme
+}