Mercurial > gemma

annotate controllers/externalwfs.go @ 342:c6bd6ed18942

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Use INSTEAD OF trigger for user deletion As we already have this for updating, it's more symmetric to make the whole thing look like a real table. TODO: make it happen also for user creation.
author Tom Gottfried <tom@intevation.de>
date Mon, 06 Aug 2018 12:37:06 +0200
parents bd292a554b6e
children e98033e3683a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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335
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1 package controllers
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2
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3 import (
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4 "encoding/xml"
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5 "fmt"
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6 "io"
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7 "log"
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8 "net/http"
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9 "strings"
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10
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11 "github.com/gorilla/mux"
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12 "golang.org/x/net/html/charset"
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13
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14 "gemma.intevation.de/gemma/config"
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15 )
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16
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17 func externalWFSProxy(rw http.ResponseWriter, req *http.Request) {
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18
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19 external := config.ExternalWFSs()
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20 if external == nil || len(external) == 0 {
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21 http.NotFound(rw, req)
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22 return
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23 }
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24 wfs := mux.Vars(req)["wfs"]
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25
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26 alias, found := external[wfs]
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27 if !found {
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28 http.NotFound(rw, req)
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29 return
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30 }
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31 data, ok := alias.(map[string]interface{})
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32 if !ok {
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33 log.Printf("error: badly configured external wfs %s\n", wfs)
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34 http.Error(rw,
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35 http.StatusText(http.StatusInternalServerError),
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36 http.StatusInternalServerError)
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37 return
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38 }
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39
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40 urlS, found := data["url"]
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41 if !found {
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42 log.Printf("error: missinf url fore xternal wfs %s\n", wfs)
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43 http.Error(rw,
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44 http.StatusText(http.StatusInternalServerError),
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45 http.StatusInternalServerError)
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46 return
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47 }
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48
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49 prefix, ok := urlS.(string)
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50 if !ok {
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51 log.Printf("error: badly configured url for external wfs %s\n", wfs)
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52 http.Error(rw,
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53 http.StatusText(http.StatusInternalServerError),
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54 http.StatusInternalServerError)
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55 return
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56 }
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57
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58 log.Printf("%v\n", prefix)
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59 url := prefix + "?" + req.URL.RawQuery
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60
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61 remoteReq, err := http.NewRequest(req.Method, url, req.Body)
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62 if err != nil {
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63 http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusBadRequest)
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64 return
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65 }
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66
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67 client := &http.Client{}
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68 resp, err := client.Do(remoteReq)
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69 if err != nil {
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70 http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusBadRequest)
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71 return
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72 }
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73
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74 var transcode bool
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75
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76 for k := range resp.Header {
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77 v := resp.Header.Get(k)
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78 rw.Header().Set(k, v)
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79 if strings.TrimSpace(strings.ToLower(k)) == "content-type" &&
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80 strings.Contains(strings.ToLower(v), "application/xml") {
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81 transcode = true
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82 }
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83 }
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84
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85 defer resp.Body.Close()
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86
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87 if transcode {
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88 to := useHTTPS(req) + "://" + req.Host
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89 if !strings.HasPrefix(req.URL.Path, "/") {
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90 to += "/"
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91 }
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92 to += req.URL.Path
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93 log.Printf("rewrite %s to: %s\n", prefix, to)
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94 err = rewrite(rw, resp.Body, prefix, to)
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95 } else {
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96 _, err = io.Copy(rw, resp.Body)
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97 }
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98
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99 if err != nil {
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100 log.Printf("copy error: %v\n", err)
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101 }
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102 }
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103
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104 func rewrite(w io.Writer, r io.Reader, from, to string) error {
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105
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106 decoder := xml.NewDecoder(r)
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107 decoder.CharsetReader = charset.NewReaderLabel
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108
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109 encoder := xml.NewEncoder(w)
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110
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111 replace := func(s string) string {
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112 return strings.Replace(s, from, to, -1)
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113 }
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114
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115 var ns nsdef
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116
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117 tokens:
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118 for {
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119 tok, err := decoder.Token()
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120 switch {
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121 case tok == nil && err == io.EOF:
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122 break tokens
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123 case err != nil:
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124 return err
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125 }
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126
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127 switch t := tok.(type) {
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128 case xml.StartElement:
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129 ns = ns.push()
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130 t = t.Copy()
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131
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132 attr := make([]xml.Attr, len(t.Attr))
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133
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134 //var lns string
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135 for i, at := range t.Attr {
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136 switch {
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137 case at.Name.Space == "xmlns":
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138 ns.define(at.Value, at.Name.Local)
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139 attr[i] = xml.Attr{Name: at.Name, Value: at.Value}
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140 default:
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141 attr[i] = xml.Attr{Name: at.Name, Value: replace(at.Value)}
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142 }
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143 }
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144 if s := ns.lookup(t.Name.Space); s != "" {
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145 t.Name.Space = ""
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146 t.Name.Local = s + ":" + t.Name.Local
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147 }
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148 t.Attr = attr
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149 tok = t
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150
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151 case xml.CharData:
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152 tok = xml.CharData(replace(string(t)))
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153
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154 case xml.EndElement:
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155 //log.Printf("lookup %s -> %s\n", t.Name.Space, ns.lookup(t.Name.Space))
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156 if s := ns.lookup(t.Name.Space); s != "" {
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157 t.Name.Space = ""
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158 t.Name.Local = s + ":" + t.Name.Local
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159 tok = t
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160 }
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161 ns = ns.pop()
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162 }
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163 if err := encoder.EncodeToken(tok); err != nil {
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164 return err
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165 }
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166 }
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167
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168 return encoder.Flush()
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169 }
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170
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171 type nsdef []map[string]string
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172
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173 func (n nsdef) lookup(ns string) string {
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174 for i := len(n) - 1; i >= 0; i-- {
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175 if s := n[i][ns]; s != "" {
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176 return s
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177 }
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178 }
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179 return ""
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180 }
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181
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182 func (n nsdef) push() nsdef {
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183 return append(n, make(map[string]string))
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184 }
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185
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186 func (n nsdef) pop() nsdef {
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187 if l := len(n); l > 0 {
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188 n[l-1] = nil
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189 n = n[:l-1]
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190 }
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191 return n
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192 }
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193
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194 func (n nsdef) define(ns, s string) {
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195 if n != nil {
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196 n[len(n)-1][ns] = s
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197 }
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198 }