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annotate controllers/externalwfs.go @ 350:1ea90a22bd15

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Better replacements for WFS proxy.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 06 Aug 2018 18:13:58 +0200
parents 56f6c5ab0f3d
children b89138a25f9e
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 "io"
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7 "log"
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8 "net/http"
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9 "net/url"
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10 "strings"
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11
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12 "github.com/gorilla/mux"
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13 "golang.org/x/net/html/charset"
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14
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15 "gemma.intevation.de/gemma/config"
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16 )
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17
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18 type RoundTripFunc func(*http.Request) (*http.Response, error)
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19
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20 func (rtf RoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
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21 return rtf(req)
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22 }
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23
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24 func externalWFSDirector(req *http.Request) {
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25
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26 abort := func(format string, args ...interface{}) {
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27 log.Printf(format, args...)
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28 panic(http.ErrAbortHandler)
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29 }
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30
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31 external := config.ExternalWFSs()
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32 if external == nil || len(external) == 0 {
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33 abort("No external WFS proxy config found\n")
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34 }
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35 vars := mux.Vars(req)
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36 wfs := vars["wfs"]
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37 rest := vars["rest"]
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38
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39 log.Printf("rest: %s\n", rest)
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40
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41 alias, found := external[wfs]
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42 if !found {
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43 abort("No config found for %s\n", wfs)
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44 }
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45 data, ok := alias.(map[string]interface{})
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46 if !ok {
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47 abort("error: badly configured external WFS %s\n", wfs)
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48 }
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49
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50 urlS, found := data["url"]
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51 if !found {
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52 abort("error: missing url for external WFS %s\n", wfs)
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53 }
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54
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55 prefix, ok := urlS.(string)
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56 if !ok {
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57 abort("error: badly configured url for external WFS %s\n", wfs)
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58 }
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59
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60 log.Printf("%v\n", prefix)
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61 nURL := prefix + "/" + rest + "?" + req.URL.RawQuery
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62 log.Printf("%v\n", nURL)
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63
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64 u, err := url.Parse(nURL)
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65 if err != nil {
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66 abort("Invalid url: %v\n", err)
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67 }
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68 req.URL = u
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69 req.Header.Set("X-Gemma-From", prefix)
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70 to := useHTTPS(req) + "://" + req.Host + "/api/externalwfs/" + wfs
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71 req.Header.Set("X-Gemma-To", to)
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72
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73 req.Host = u.Host
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74
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75 //log.Printf("headers: %v\n", req.Header)
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76 }
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77
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78 func externalWFSTransport(req *http.Request) (*http.Response, error) {
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79
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80 from := req.Header.Get("X-Gemma-From")
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81 to := req.Header.Get("X-Gemma-To")
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82 req.Header.Del("X-Gemma-From")
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83 req.Header.Del("X-Gemma-To")
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84
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85 // To prevent some caching effects.
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86 req.Header.Del("If-None-Match")
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87
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88 resp, err := http.DefaultTransport.RoundTrip(req)
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89 if err != nil {
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90 return nil, err
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91 }
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92 resp.Header.Set("X-Gemma-From", from)
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93 resp.Header.Set("X-Gemma-To", to)
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94
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95 return resp, err
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96 }
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97
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98 func externalWFSModifyResponse(resp *http.Response) error {
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99
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100 from := resp.Header.Get("X-Gemma-From")
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101 to := resp.Header.Get("X-Gemma-To")
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102 resp.Header.Del("X-Gemma-From")
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103 resp.Header.Del("X-Gemma-To")
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104
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105 xml := isXML(resp.Header)
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106
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107 gzipped := strings.Contains(resp.Header.Get("Content-Encoding"), "gzip")
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108
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109 if xml {
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110 log.Printf("rewrite from %s to %s\n", from, to)
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111
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112 pr, pw := io.Pipe()
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113
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114 var r io.ReadCloser
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115 var w io.WriteCloser
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116 if gzipped {
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117 var err error
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118 r, err = gzip.NewReader(resp.Body)
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119 if err != nil {
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120 return err
344
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121 }
348
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122 w = gzip.NewWriter(pw)
346
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123 } else {
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124 r = resp.Body
348
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125 w = pw
344
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126 }
346
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127
348
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128 go func(force io.ReadCloser) {
346
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129 defer func() {
348
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130 w.Close()
346
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131 pw.Close()
348
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132 force.Close()
346
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133 }()
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134 /*
347
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135 if _, err := io.Copy(pw, r); err != nil {
346
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136 log.Printf("rewrite failed: %v\n", err)
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137 return
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138 }
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139 */
349
56f6c5ab0f3d Made WFS proxy rewriting work (to some degrees).
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140 if err := rewrite(w, r, from, to); err != nil {
347
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141 log.Printf("rewrite failed: %v\n", err)
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142 return
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143 }
346
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144 log.Println("rewrite successful")
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145 }(resp.Body)
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146
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147 resp.Body = pr
344
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148 }
346
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149 return nil
344
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150 }
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151
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152 func isXML(h http.Header) bool {
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153 for _, t := range h["Content-Type"] {
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154 t = strings.ToLower(t)
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155 if strings.Contains(t, "text/xml") ||
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diff changeset
156 strings.Contains(t, "application/xml") {
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157 return true
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158 }
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159 }
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160 return false
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161 }
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diff changeset
162
335
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diff changeset
163 func rewrite(w io.Writer, r io.Reader, from, to string) error {
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164
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165 decoder := xml.NewDecoder(r)
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166 decoder.CharsetReader = charset.NewReaderLabel
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167
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168 encoder := xml.NewEncoder(w)
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169
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170 replace := func(s string) string {
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171 return strings.Replace(s, from, to, -1)
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172 }
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173
347
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174 //var ns nsdef
335
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175
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176 tokens:
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177 for {
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178 tok, err := decoder.Token()
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179 switch {
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180 case tok == nil && err == io.EOF:
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diff changeset
181 break tokens
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diff changeset
182 case err != nil:
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183 return err
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parents:
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184 }
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185
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186 switch t := tok.(type) {
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187 case xml.StartElement:
347
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188 //ns = ns.push()
335
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189 t = t.Copy()
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190
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191 attr := make([]xml.Attr, len(t.Attr))
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192
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193 //var lns string
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194 for i, at := range t.Attr {
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195 switch {
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196 case at.Name.Space == "xmlns":
347
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diff changeset
197 //ns.define(at.Value, at.Name.Local)
335
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diff changeset
198 attr[i] = xml.Attr{Name: at.Name, Value: at.Value}
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diff changeset
199 default:
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200 attr[i] = xml.Attr{Name: at.Name, Value: replace(at.Value)}
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diff changeset
201 }
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202 }
347
72c76ab112e9 Compressing the namespaces in the WFS proxy is broken atm. So deactivate it.
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diff changeset
203 //if s := ns.lookup(t.Name.Space); s != "" {
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diff changeset
204 // t.Name.Space = ""
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diff changeset
205 // t.Name.Local = s + ":" + t.Name.Local
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diff changeset
206 //}
335
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diff changeset
207 t.Attr = attr
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diff changeset
208 tok = t
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diff changeset
209
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parents:
diff changeset
210 case xml.CharData:
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diff changeset
211 tok = xml.CharData(replace(string(t)))
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212
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213 case xml.EndElement:
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diff changeset
214 //log.Printf("lookup %s -> %s\n", t.Name.Space, ns.lookup(t.Name.Space))
347
72c76ab112e9 Compressing the namespaces in the WFS proxy is broken atm. So deactivate it.
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diff changeset
215 //if s := ns.lookup(t.Name.Space); s != "" {
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diff changeset
216 // t.Name.Space = ""
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diff changeset
217 // t.Name.Local = s + ":" + t.Name.Local
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diff changeset
218 // tok = t
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diff changeset
219 // }
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diff changeset
220 // ns = ns.pop()
335
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diff changeset
221 }
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parents:
diff changeset
222 if err := encoder.EncodeToken(tok); err != nil {
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diff changeset
223 return err
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parents:
diff changeset
224 }
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parents:
diff changeset
225 }
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parents:
diff changeset
226
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diff changeset
227 return encoder.Flush()
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parents:
diff changeset
228 }
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diff changeset
229
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diff changeset
230 type nsdef []map[string]string
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diff changeset
231
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diff changeset
232 func (n nsdef) lookup(ns string) string {
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parents:
diff changeset
233 for i := len(n) - 1; i >= 0; i-- {
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parents:
diff changeset
234 if s := n[i][ns]; s != "" {
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parents:
diff changeset
235 return s
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parents:
diff changeset
236 }
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parents:
diff changeset
237 }
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parents:
diff changeset
238 return ""
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parents:
diff changeset
239 }
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parents:
diff changeset
240
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
241 func (n nsdef) push() nsdef {
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parents:
diff changeset
242 return append(n, make(map[string]string))
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parents:
diff changeset
243 }
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parents:
diff changeset
244
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parents:
diff changeset
245 func (n nsdef) pop() nsdef {
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parents:
diff changeset
246 if l := len(n); l > 0 {
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parents:
diff changeset
247 n[l-1] = nil
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parents:
diff changeset
248 n = n[:l-1]
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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249 }
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250 return n
bd292a554b6e Made gemma a WFS proxy.
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251 }
bd292a554b6e Made gemma a WFS proxy.
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parents:
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252
bd292a554b6e Made gemma a WFS proxy.
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253 func (n nsdef) define(ns, s string) {
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254 if n != nil {
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255 n[len(n)-1][ns] = s
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256 }
bd292a554b6e Made gemma a WFS proxy.
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257 }