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annotate controllers/externalwfs.go @ 344:e98033e3683a

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Be more precise with HTTP headers in WFS proxy.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 06 Aug 2018 14:52:04 +0200
parents bd292a554b6e
children ad0e47c1fedf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package controllers
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2
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3 import (
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4 "compress/gzip"
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5 "encoding/xml"
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6 "fmt"
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7 "io"
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8 "log"
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9 "net"
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10 "net/http"
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11 "strings"
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12
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13 "github.com/gorilla/mux"
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14 "golang.org/x/net/html/charset"
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15
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16 "gemma.intevation.de/gemma/config"
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17 )
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18
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19 func copyHeader(dst, src http.Header) {
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20 for k, vv := range src {
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21 log.Printf("%s: %v\n", k, vv)
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22 for _, v := range vv {
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23 dst.Add(k, v)
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24 }
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25 }
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26 }
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27
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28 func cloneHeader(h http.Header) http.Header {
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29 h2 := make(http.Header, len(h))
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30 for k, vv := range h {
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31 log.Printf("clone: %s: %v\n", k, vv)
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32 vv2 := make([]string, len(vv))
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33 copy(vv2, vv)
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34 h2[k] = vv2
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35 }
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36 return h2
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37 }
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38
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39 // Hop-by-hop headers. These are removed when sent to the backend.
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40 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html
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41 var hopHeaders = []string{
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42 "Connection",
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43 "Proxy-Connection", // non-standard but still sent by libcurl and rejected by e.g. google
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44 "Keep-Alive",
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45 "Proxy-Authenticate",
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46 "Proxy-Authorization",
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47 "Te", // canonicalized version of "TE"
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48 "Trailer", // not Trailers per URL above; http://www.rfc-editor.org/errata_search.php?eid=4522
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49 "Transfer-Encoding",
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50 "Upgrade",
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51 }
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52
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53 // removeConnectionHeaders removes hop-by-hop headers listed in the "Connection" header of h.
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54 // See RFC 2616, section 14.10.
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55 func removeConnectionHeaders(h http.Header) {
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56 if c := h.Get("Connection"); c != "" {
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57 for _, f := range strings.Split(c, ",") {
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58 if f = strings.TrimSpace(f); f != "" {
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59 h.Del(f)
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60 }
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61 }
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62 }
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63 }
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64
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65 func isXML(h http.Header) bool {
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66 for _, t := range h["Content-Type"] {
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67 t = strings.ToLower(t)
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68 if strings.Contains(t, "text/xml") ||
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69 strings.Contains(t, "application/xml") {
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70 return true
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71 }
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72 }
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73 return false
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74 }
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75
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76 func externalWFSProxy(rw http.ResponseWriter, req *http.Request) {
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77
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78 external := config.ExternalWFSs()
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79 if external == nil || len(external) == 0 {
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80 http.NotFound(rw, req)
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81 return
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82 }
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83 wfs := mux.Vars(req)["wfs"]
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84
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85 alias, found := external[wfs]
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86 if !found {
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87 http.NotFound(rw, req)
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88 return
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89 }
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90 data, ok := alias.(map[string]interface{})
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91 if !ok {
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92 log.Printf("error: badly configured external wfs %s\n", wfs)
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93 http.Error(rw,
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94 http.StatusText(http.StatusInternalServerError),
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95 http.StatusInternalServerError)
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96 return
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97 }
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98
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99 urlS, found := data["url"]
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100 if !found {
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101 log.Printf("error: missinf url fore xternal wfs %s\n", wfs)
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102 http.Error(rw,
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103 http.StatusText(http.StatusInternalServerError),
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104 http.StatusInternalServerError)
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105 return
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106 }
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107
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108 prefix, ok := urlS.(string)
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109 if !ok {
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110 log.Printf("error: badly configured url for external wfs %s\n", wfs)
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111 http.Error(rw,
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112 http.StatusText(http.StatusInternalServerError),
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113 http.StatusInternalServerError)
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114 return
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115 }
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116
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117 log.Printf("%v\n", prefix)
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118 url := prefix + "?" + req.URL.RawQuery
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119 log.Printf("%v\n", url)
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120
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121 remoteReq, err := http.NewRequest(req.Method, url, req.Body)
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122 if err != nil {
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123 http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusBadRequest)
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124 return
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125 }
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126
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127 remoteReq.Header = cloneHeader(req.Header)
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128 removeConnectionHeaders(remoteReq.Header)
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129
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130 // Remove hop-by-hop headers to the backend. Especially
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131 // important is "Connection" because we want a persistent
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132 // connection, regardless of what the client sent to us.
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diff changeset
133 for _, h := range hopHeaders {
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diff changeset
134 if remoteReq.Header.Get(h) != "" {
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diff changeset
135 remoteReq.Header.Del(h)
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136 }
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137 }
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138
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diff changeset
139 if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
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140 // If we aren't the first proxy retain prior
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141 // X-Forwarded-For information as a comma+space
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142 // separated list and fold multiple headers into one.
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diff changeset
143 if prior, ok := remoteReq.Header["X-Forwarded-For"]; ok {
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diff changeset
144 clientIP = strings.Join(prior, ", ") + ", " + clientIP
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145 }
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146 remoteReq.Header.Set("X-Forwarded-For", clientIP)
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147 log.Printf("X-Forwarded-For: %s\n", clientIP)
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148 }
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149
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150 log.Printf("req: %v\n", remoteReq)
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151
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diff changeset
152 resp, err := http.DefaultTransport.RoundTrip(remoteReq)
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153 //client := &http.Client{}
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154 //resp, err := client.Do(remoteReq)
335
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155 if err != nil {
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156 http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusBadRequest)
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157 return
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158 }
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159
344
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160 log.Printf("%v\n", resp.Header)
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161
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diff changeset
162 xml := isXML(resp.Header)
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163 log.Printf("is xml: %t\n", xml)
335
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164
344
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165 gzipped := strings.Contains(resp.Header.Get("Content-Encoding"), "gzip")
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166 if gzipped {
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167 resp.Header.Del("Content-Encoding")
335
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168 }
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169
344
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170 removeConnectionHeaders(resp.Header)
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diff changeset
171 copyHeader(rw.Header(), resp.Header)
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172
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diff changeset
173 rw.WriteHeader(resp.StatusCode)
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174
335
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175 defer resp.Body.Close()
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176
344
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177 if xml {
335
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178 to := useHTTPS(req) + "://" + req.Host
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179 if !strings.HasPrefix(req.URL.Path, "/") {
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180 to += "/"
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181 }
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182 to += req.URL.Path
344
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183 var r io.Reader = resp.Body
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diff changeset
184 if gzipped {
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185 var err error
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diff changeset
186 r, err = gzip.NewReader(resp.Body)
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diff changeset
187 if err != nil {
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diff changeset
188 log.Printf("gzip error: %v\n", err)
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189 http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusBadGateway)
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diff changeset
190 return
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191 }
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192 } else {
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193 r = resp.Body
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194 }
335
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195 log.Printf("rewrite %s to: %s\n", prefix, to)
344
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196 err = rewrite(rw, r, prefix, to)
335
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197 } else {
344
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diff changeset
198 log.Printf("no rewrite")
335
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199 _, err = io.Copy(rw, resp.Body)
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200 }
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parents:
diff changeset
201
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parents:
diff changeset
202 if err != nil {
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parents:
diff changeset
203 log.Printf("copy error: %v\n", err)
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parents:
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204 }
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parents:
diff changeset
205 }
bd292a554b6e Made gemma a WFS proxy.
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parents:
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206
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parents:
diff changeset
207 func rewrite(w io.Writer, r io.Reader, from, to string) error {
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diff changeset
208
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209 decoder := xml.NewDecoder(r)
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parents:
diff changeset
210 decoder.CharsetReader = charset.NewReaderLabel
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parents:
diff changeset
211
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parents:
diff changeset
212 encoder := xml.NewEncoder(w)
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parents:
diff changeset
213
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214 replace := func(s string) string {
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parents:
diff changeset
215 return strings.Replace(s, from, to, -1)
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parents:
diff changeset
216 }
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parents:
diff changeset
217
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218 var ns nsdef
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parents:
diff changeset
219
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
220 tokens:
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221 for {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
222 tok, err := decoder.Token()
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223 switch {
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parents:
diff changeset
224 case tok == nil && err == io.EOF:
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 break tokens
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
226 case err != nil:
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
227 return err
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
228 }
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
229
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
230 switch t := tok.(type) {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
231 case xml.StartElement:
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
232 ns = ns.push()
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
233 t = t.Copy()
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
234
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
235 attr := make([]xml.Attr, len(t.Attr))
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parents:
diff changeset
236
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parents:
diff changeset
237 //var lns string
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parents:
diff changeset
238 for i, at := range t.Attr {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
239 switch {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
240 case at.Name.Space == "xmlns":
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
241 ns.define(at.Value, at.Name.Local)
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parents:
diff changeset
242 attr[i] = xml.Attr{Name: at.Name, Value: at.Value}
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parents:
diff changeset
243 default:
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
244 attr[i] = xml.Attr{Name: at.Name, Value: replace(at.Value)}
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parents:
diff changeset
245 }
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
246 }
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
247 if s := ns.lookup(t.Name.Space); s != "" {
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parents:
diff changeset
248 t.Name.Space = ""
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parents:
diff changeset
249 t.Name.Local = s + ":" + t.Name.Local
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parents:
diff changeset
250 }
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parents:
diff changeset
251 t.Attr = attr
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diff changeset
252 tok = t
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parents:
diff changeset
253
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
254 case xml.CharData:
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parents:
diff changeset
255 tok = xml.CharData(replace(string(t)))
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parents:
diff changeset
256
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
257 case xml.EndElement:
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parents:
diff changeset
258 //log.Printf("lookup %s -> %s\n", t.Name.Space, ns.lookup(t.Name.Space))
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parents:
diff changeset
259 if s := ns.lookup(t.Name.Space); s != "" {
bd292a554b6e Made gemma a WFS proxy.
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parents:
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260 t.Name.Space = ""
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261 t.Name.Local = s + ":" + t.Name.Local
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262 tok = t
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263 }
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264 ns = ns.pop()
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265 }
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266 if err := encoder.EncodeToken(tok); err != nil {
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267 return err
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268 }
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269 }
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270
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271 return encoder.Flush()
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272 }
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273
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274 type nsdef []map[string]string
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275
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276 func (n nsdef) lookup(ns string) string {
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277 for i := len(n) - 1; i >= 0; i-- {
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278 if s := n[i][ns]; s != "" {
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279 return s
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280 }
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281 }
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282 return ""
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283 }
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284
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285 func (n nsdef) push() nsdef {
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286 return append(n, make(map[string]string))
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287 }
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288
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289 func (n nsdef) pop() nsdef {
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290 if l := len(n); l > 0 {
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291 n[l-1] = nil
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292 n = n[:l-1]
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293 }
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294 return n
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295 }
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296
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297 func (n nsdef) define(ns, s string) {
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298 if n != nil {
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299 n[len(n)-1][ns] = s
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300 }
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301 }