Mercurial > gemma

annotate controllers/externalwfs.go @ 357:3e96a15600b7

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merge
author Thomas Junk <thomas.junk@intevation.de>
date Tue, 07 Aug 2018 18:00:53 +0200
parents e170075c22ac
children 55388227e7da
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package controllers
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2
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3 import (
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4 "compress/flate"
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5 "compress/gzip"
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6 "encoding/xml"
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7 "io"
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8 "io/ioutil"
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9 "log"
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10 "net/http"
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11 "net/url"
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12 "strings"
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13
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14 "github.com/gorilla/mux"
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15 "golang.org/x/net/html/charset"
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16
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17 "gemma.intevation.de/gemma/config"
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18 )
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19
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20 type RoundTripFunc func(*http.Request) (*http.Response, error)
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21
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22 func (rtf RoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
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23 return rtf(req)
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24 }
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25
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26 func externalWFSDirector(req *http.Request) {
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27
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28 abort := func(format string, args ...interface{}) {
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29 log.Printf(format, args...)
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30 panic(http.ErrAbortHandler)
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31 }
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32
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33 external := config.ExternalWFSs()
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34 if external == nil || len(external) == 0 {
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35 abort("No external WFS proxy config found\n")
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36 }
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37 vars := mux.Vars(req)
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38 wfs := vars["wfs"]
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39 rest := vars["rest"]
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40
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41 log.Printf("rest: %s\n", rest)
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42
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43 alias, found := external[wfs]
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44 if !found {
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45 abort("No config found for %s\n", wfs)
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46 }
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47 data, ok := alias.(map[string]interface{})
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48 if !ok {
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49 abort("error: badly configured external WFS %s\n", wfs)
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50 }
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51
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52 urlS, found := data["url"]
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53 if !found {
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54 abort("error: missing url for external WFS %s\n", wfs)
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55 }
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56
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57 prefix, ok := urlS.(string)
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58 if !ok {
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59 abort("error: badly configured url for external WFS %s\n", wfs)
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60 }
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61
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62 log.Printf("%v\n", prefix)
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63 nURL := prefix + "/" + rest + "?" + req.URL.RawQuery
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64 log.Printf("%v\n", nURL)
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65
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66 u, err := url.Parse(nURL)
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67 if err != nil {
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68 abort("Invalid url: %v\n", err)
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69 }
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70 req.URL = u
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71 req.Header.Set("X-Gemma-From", prefix)
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72 to := useHTTPS(req) + "://" + req.Host + "/api/externalwfs/" + wfs
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73 req.Header.Set("X-Gemma-To", to)
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74
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75 req.Host = u.Host
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76
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77 //log.Printf("headers: %v\n", req.Header)
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78 }
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79
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80 func externalWFSTransport(req *http.Request) (*http.Response, error) {
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81
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82 from := req.Header.Get("X-Gemma-From")
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83 to := req.Header.Get("X-Gemma-To")
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84 req.Header.Del("X-Gemma-From")
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85 req.Header.Del("X-Gemma-To")
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86
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87 // To prevent some caching effects.
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88 req.Header.Del("If-None-Match")
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89
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90 resp, err := http.DefaultTransport.RoundTrip(req)
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91 if err != nil {
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92 return nil, err
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93 }
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94 resp.Header.Set("X-Gemma-From", from)
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95 resp.Header.Set("X-Gemma-To", to)
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96
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97 return resp, err
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98 }
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99
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100 type nopCloser struct {
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101 io.Writer
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102 }
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103
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104 func (nopCloser) Close() error { return nil }
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105
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106 func encoding(h http.Header) (
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107 func(io.Reader) (io.ReadCloser, error),
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108 func(io.Writer) (io.WriteCloser, error),
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109 ) {
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110 switch enc := h.Get("Content-Encoding"); {
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111 case strings.Contains(enc, "gzip"):
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112 log.Println("gzip compression")
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113 return func(r io.Reader) (io.ReadCloser, error) {
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114 return gzip.NewReader(r)
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115 },
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116 func(w io.Writer) (io.WriteCloser, error) {
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117 return gzip.NewWriter(w), nil
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118 }
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119 case strings.Contains(enc, "deflate"):
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120 log.Println("Deflate compression")
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diff changeset
121 return func(r io.Reader) (io.ReadCloser, error) {
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diff changeset
122 return flate.NewReader(r), nil
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
123 },
23d4a9104b0c Support deflate compression in WFS proxy, too.
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parents: 351
diff changeset
124 func(w io.Writer) (io.WriteCloser, error) {
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diff changeset
125 return flate.NewWriter(w, flate.DefaultCompression)
23d4a9104b0c Support deflate compression in WFS proxy, too.
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parents: 351
diff changeset
126 }
23d4a9104b0c Support deflate compression in WFS proxy, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 351
diff changeset
127 default:
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
128 log.Println("No content compression")
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diff changeset
129 return func(r io.Reader) (io.ReadCloser, error) {
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parents: 351
diff changeset
130 if r2, ok := r.(io.ReadCloser); ok {
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
131 return r2, nil
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
132 }
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
133 return ioutil.NopCloser(r), nil
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 351
diff changeset
134 },
23d4a9104b0c Support deflate compression in WFS proxy, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 351
diff changeset
135 func(w io.Writer) (io.WriteCloser, error) {
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
136 if w2, ok := w.(io.WriteCloser); ok {
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
137 return w2, nil
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parents: 351
diff changeset
138 }
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
139 return nopCloser{w}, nil
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diff changeset
140 }
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parents: 351
diff changeset
141 }
23d4a9104b0c Support deflate compression in WFS proxy, too.
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parents: 351
diff changeset
142 }
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
143
346
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diff changeset
144 func externalWFSModifyResponse(resp *http.Response) error {
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diff changeset
145
349
56f6c5ab0f3d Made WFS proxy rewriting work (to some degrees).
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diff changeset
146 from := resp.Header.Get("X-Gemma-From")
346
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diff changeset
147 to := resp.Header.Get("X-Gemma-To")
349
56f6c5ab0f3d Made WFS proxy rewriting work (to some degrees).
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parents: 348
diff changeset
148 resp.Header.Del("X-Gemma-From")
346
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diff changeset
149 resp.Header.Del("X-Gemma-To")
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diff changeset
150
355
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parents: 354
diff changeset
151 if !isXML(resp.Header) {
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diff changeset
152 return nil
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parents: 354
diff changeset
153 }
348
9543ca97aa70 Re-enable content gzip encoding in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 347
diff changeset
154
355
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diff changeset
155 log.Printf("rewrite from %s to %s\n", from, to)
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
156
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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diff changeset
157 pr, pw := io.Pipe()
348
9543ca97aa70 Re-enable content gzip encoding in WFS proxy.
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parents: 347
diff changeset
158
355
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diff changeset
159 var (
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diff changeset
160 r io.ReadCloser
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parents: 354
diff changeset
161 w io.WriteCloser
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 354
diff changeset
162 err error
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
163 )
352
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
164
355
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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diff changeset
165 reader, writer := encoding(resp.Header)
354
aa24b5691838 Simplified WFS proxy code a bit.
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parents: 352
diff changeset
166
355
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
167 if r, err = reader(resp.Body); err != nil {
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
168 return err
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parents: 354
diff changeset
169 }
352
23d4a9104b0c Support deflate compression in WFS proxy, too.
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diff changeset
170
355
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parents: 354
diff changeset
171 if w, err = writer(pw); err != nil {
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
172 return err
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
173 }
346
ad0e47c1fedf Use httputil.ReverseProxy for WFS proxying.
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diff changeset
174
355
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parents: 354
diff changeset
175 go func(force io.ReadCloser) {
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
176 defer func() {
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 354
diff changeset
177 //r.Close()
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diff changeset
178 w.Close()
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parents: 354
diff changeset
179 pw.Close()
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diff changeset
180 force.Close()
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 354
diff changeset
181 }()
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parents: 354
diff changeset
182 if err := rewrite(w, r, from, to); err != nil {
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 354
diff changeset
183 log.Printf("rewrite failed: %v\n", err)
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 354
diff changeset
184 return
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
185 }
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
186 log.Println("rewrite successful")
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
187 }(resp.Body)
346
ad0e47c1fedf Use httputil.ReverseProxy for WFS proxying.
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parents: 344
diff changeset
188
355
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
189 resp.Body = pr
e170075c22ac Cosmetics: Unindent some code in WFS proxy.
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parents: 354
diff changeset
190
346
ad0e47c1fedf Use httputil.ReverseProxy for WFS proxying.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 344
diff changeset
191 return nil
344
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
192 }
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
193
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
194 func isXML(h http.Header) bool {
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
195 for _, t := range h["Content-Type"] {
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
196 t = strings.ToLower(t)
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
197 if strings.Contains(t, "text/xml") ||
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
198 strings.Contains(t, "application/xml") {
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
199 return true
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
200 }
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
201 }
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
202 return false
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
203 }
e98033e3683a Be more precise with HTTP headers in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 335
diff changeset
204
335
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
205 func rewrite(w io.Writer, r io.Reader, from, to string) error {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
206
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
207 decoder := xml.NewDecoder(r)
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
208 decoder.CharsetReader = charset.NewReaderLabel
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
209
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
210 encoder := xml.NewEncoder(w)
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
211
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
212 replace := func(s string) string {
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
213 return strings.Replace(s, from, to, -1)
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
214 }
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
215
351
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
216 var ns nsdef
335
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
217
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218 tokens:
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
219 for {
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
220 tok, err := decoder.Token()
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221 switch {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
222 case tok == nil && err == io.EOF:
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223 break tokens
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 case err != nil:
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 return err
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
226 }
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
227
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
228 switch t := tok.(type) {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
229 case xml.StartElement:
351
b89138a25f9e Fixed namespace compression in WFS proxy.
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parents: 350
diff changeset
230 ns = ns.push()
335
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
231 t = t.Copy()
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
232
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
233 attr := make([]xml.Attr, len(t.Attr))
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
234
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
235 for i, at := range t.Attr {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
236 switch {
bd292a554b6e Made gemma a WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
237 case at.Name.Space == "xmlns":
351
b89138a25f9e Fixed namespace compression in WFS proxy.
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parents: 350
diff changeset
238 ns.define(at.Value, at.Name.Local)
b89138a25f9e Fixed namespace compression in WFS proxy.
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parents: 350
diff changeset
239 at.Name.Local = "xmlns:" + at.Name.Local
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
240 at.Name.Space = ""
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
241
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
242 case at.Name.Space != "":
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
243 if s := ns.lookup(at.Name.Space); s != "" {
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
244 at.Name.Local = s + ":" + at.Name.Local
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
245 at.Name.Space = ""
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
246 }
335
bd292a554b6e Made gemma a WFS proxy.
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parents:
diff changeset
247 }
351
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
248
b89138a25f9e Fixed namespace compression in WFS proxy.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 350
diff changeset
249 attr[i] = at
335
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250 }
351
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251 if s := ns.lookup(t.Name.Space); s != "" {
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252 t.Name.Space = ""
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253 t.Name.Local = s + ":" + t.Name.Local
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254 }
335
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255 t.Attr = attr
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256 tok = t
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257
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258 case xml.CharData:
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259 tok = xml.CharData(replace(string(t)))
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260
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261 case xml.EndElement:
351
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262 if s := ns.lookup(t.Name.Space); s != "" {
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263 t.Name.Space = ""
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264 t.Name.Local = s + ":" + t.Name.Local
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265 tok = t
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266 }
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267 ns = ns.pop()
335
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268 }
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269 if err := encoder.EncodeToken(tok); err != nil {
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270 return err
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271 }
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272 }
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273
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274 return encoder.Flush()
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275 }
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276
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277 type nsdef []map[string]string
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278
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279 func (n nsdef) lookup(ns string) string {
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280 for i := len(n) - 1; i >= 0; i-- {
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281 if s := n[i][ns]; s != "" {
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282 return s
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283 }
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284 }
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285 return ""
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286 }
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287
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288 func (n nsdef) push() nsdef {
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289 return append(n, make(map[string]string))
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290 }
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291
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292 func (n nsdef) pop() nsdef {
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293 if l := len(n); l > 0 {
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294 n[l-1] = nil
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295 n = n[:l-1]
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296 }
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297 return n
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298 }
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299
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300 func (n nsdef) define(ns, s string) {
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301 if n != nil {
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302 n[len(n)-1][ns] = s
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303 }
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304 }