Mercurial > gemma
annotate pkg/wfs/capabilities.go @ 4931:e41d42be0e13 fairway-marks-import
One more callback to avoid code duplication more consequently
author | Tom Gottfried <tom@intevation.de> |
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date | Fri, 14 Feb 2020 19:34:08 +0100 |
parents | 04876d865528 |
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rev | line source |
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package wfs |
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15 |
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16 import ( |
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17 "encoding/xml" |
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18 "errors" |
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19 "io" |
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20 "regexp" |
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21 "strconv" |
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22 "strings" |
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23 |
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24 "golang.org/x/net/html/charset" |
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25 ) |
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26 |
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27 // Keyword stores a value. |
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28 type Keyword struct { |
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29 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Keyword"` |
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30 Value string `xml:",cdata"` |
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31 } |
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32 |
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33 // Keywords stores a list of keywords. |
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34 type Keywords struct { |
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35 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Keywords"` |
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36 Keywords []Keyword `xml:"Keyword"` |
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37 } |
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38 |
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39 // ServiceIdentification contains meta informations about a WFS. |
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40 type ServiceIdentification struct { |
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41 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 ServiceIdentification"` |
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42 Title string |
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43 Abstract string |
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44 Keywords Keywords `xml:"Keywords"` |
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45 ServiceType string |
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46 ServiceTypeVersion string |
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47 } |
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48 |
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49 // Get stores the link to the GET method |
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50 type Get struct { |
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51 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Get"` |
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52 HRef string `xml:"http://www.w3.org/1999/xlink href,attr"` |
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53 } |
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54 |
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55 // Post stores the link to the POST method. |
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56 type Post struct { |
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57 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Post"` |
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58 HRef string `xml:"http://www.w3.org/1999/xlink href,attr"` |
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59 } |
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60 |
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61 // HTTP is a container for HTTP methods. |
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62 type HTTP struct { |
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63 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 HTTP"` |
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64 Get *Get `xml:"Get"` |
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65 Post *Post `xml:"Post"` |
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66 } |
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67 |
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68 // DCP wraps the HTTP container. |
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69 type DCP struct { |
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70 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 DCP"` |
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71 HTTP HTTP `xml:"HTTP"` |
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72 } |
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73 |
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74 // Value is a simple string value. |
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75 type Value struct { |
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76 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Value"` |
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77 Value string `xml:",cdata"` |
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78 } |
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79 |
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80 // AllowedValues is list positive list of values. |
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81 type AllowedValues struct { |
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82 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 AllowedValues"` |
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83 Values []Value `xml:"Value"` |
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84 } |
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85 |
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86 // Parameter is a named parameter with a list of allowed values. |
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87 type Parameter struct { |
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88 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Parameter"` |
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89 Name string `xml:"name,attr"` |
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90 AllowedValues AllowedValues `xml:"AllowedValues"` |
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91 } |
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92 |
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93 // DefaultValue is the default value of a constraint. |
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94 type DefaultValue struct { |
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95 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 DefaultValue"` |
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96 Value string `xml:",cdata"` |
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97 } |
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98 |
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99 // Constraint is a named constraint with a list of allowed values |
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100 // and a default value. |
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101 type Constraint struct { |
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102 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Constraint"` |
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103 Name string `xml:"name,attr"` |
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104 AllowedValues AllowedValues `xml:"AllowedValues"` |
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105 DefaultValue *DefaultValue `xml:"DefaultValue"` |
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106 } |
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107 |
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108 // Operation contains informations of a WFS operation. |
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109 type Operation struct { |
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110 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 Operation"` |
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111 Name string `xml:"name,attr"` |
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112 DCP DCP `xml:"DCP"` |
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113 Parameters []*Parameter `xml:"Parameter"` |
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114 Constraints []*Constraint `xml:"Constraint"` |
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115 } |
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116 |
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117 // OperationsMetadata is list of operations and constraints. |
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118 type OperationsMetadata struct { |
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119 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 OperationsMetadata"` |
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120 Operations []*Operation `xml:"Operation"` |
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121 Constraints []*Constraint `xml:"Constraint"` |
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122 } |
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123 |
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124 // WGS84BoundingBox is a bounding box feature type in WGS84. |
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125 type WGS84BoundingBox struct { |
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126 XMLName xml.Name `xml:"http://www.opengis.net/ows/1.1 WGS84BoundingBox"` |
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127 LowerCorner string `xml:"LowerCorner"` |
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128 UpperCorner string `xml:"UpperCorner"` |
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129 } |
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130 |
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131 // FeatureType is layer served by the WFS: |
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132 type FeatureType struct { |
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133 XMLName xml.Name `xml:"http://www.opengis.net/wfs/2.0 FeatureType"` |
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134 Name string `xml:"Name"` |
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135 Title string `xml:"Title"` |
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136 Abstract string `xml:"Abstract"` |
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137 Keywords Keywords `xml:"Keywords"` |
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138 DefaultCRS string `xml:"DefaultCRS"` |
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139 OtherCRSs []string `xml:"OtherCRS"` |
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140 WGS84BoundingBox *WGS84BoundingBox `xml:"WGS84BoundingBox"` |
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141 Namespaces []xml.Name `xml:"-"` |
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142 } |
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143 |
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144 // shadowFeatureType is used to prevent recursive UnmarshalXML for FeatureType. |
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145 type shadowFeatureType struct { |
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146 XMLName xml.Name `xml:"http://www.opengis.net/wfs/2.0 FeatureType"` |
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147 Name string `xml:"Name"` |
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148 Title string `xml:"Title"` |
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149 Abstract string `xml:"Abstract"` |
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150 Keywords Keywords `xml:"Keywords"` |
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151 DefaultCRS string `xml:"DefaultCRS"` |
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152 OtherCRSs []string `xml:"OtherCRS"` |
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153 WGS84BoundingBox *WGS84BoundingBox `xml:"WGS84BoundingBox"` |
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154 Namespaces []xml.Name `xml:"-"` |
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155 } |
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156 |
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157 // UnmarshalXML implements xml.Unmarshaler for better namespace handling. |
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158 func (ft *FeatureType) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error { |
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159 // Filter out the namespaces for this feature type. |
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160 var ns []xml.Name |
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161 for _, attr := range start.Attr { |
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162 if attr.Name.Space == "xmlns" { |
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163 ns = append(ns, xml.Name{Space: attr.Name.Local, Local: attr.Value}) |
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164 } |
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165 } |
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166 var sft shadowFeatureType |
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167 if err := d.DecodeElement(&sft, &start); err != nil { |
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168 return err |
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169 } |
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170 *ft = FeatureType(sft) |
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171 ft.Namespaces = ns |
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172 return nil |
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173 } |
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174 |
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175 // FeatureTypeList is the list of layers served by the WFS. |
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176 type FeatureTypeList struct { |
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177 XMLName xml.Name `xml:"http://www.opengis.net/wfs/2.0 FeatureTypeList"` |
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178 FeatureTypes []*FeatureType `xml:"FeatureType"` |
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179 } |
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180 |
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181 // Capabilities is the top level metadata struct. |
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182 type Capabilities struct { |
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183 XMLName xml.Name `xml:"http://www.opengis.net/wfs/2.0 WFS_Capabilities"` |
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184 |
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185 BaseURL string `xml:"-"` |
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186 |
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187 ServiceIdentification ServiceIdentification |
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188 OperationsMetadata OperationsMetadata |
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189 FeatureTypeList FeatureTypeList |
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190 } |
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191 |
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192 // FindOperation searches the capabilities for a specifc operation. |
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193 // Returns nil if not found. |
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194 func (c *Capabilities) FindOperation(name string) *Operation { |
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195 for _, op := range c.OperationsMetadata.Operations { |
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196 if op.Name == name { |
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197 return op |
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198 } |
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199 } |
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200 return nil |
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201 } |
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202 |
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203 // SupportsHits checks if a operation supports the hits request. |
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204 func (op *Operation) SupportsHits() bool { |
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205 for _, p := range op.Parameters { |
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206 if p.Name == "resultType" { |
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207 for _, av := range p.AllowedValues.Values { |
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208 if av.Value == "hits" { |
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209 return true |
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210 } |
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211 } |
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212 } |
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213 } |
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214 return false |
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215 } |
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216 |
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217 // SupportsOutputFormat checks if one of the given formats is supported. |
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218 func (op *Operation) SupportsOutputFormat(formats ...string) string { |
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219 for _, p := range op.Parameters { |
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220 if p.Name == "outputFormat" { |
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221 for _, av := range p.AllowedValues.Values { |
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222 v := strings.ToLower(av.Value) |
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223 for _, f := range formats { |
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224 if v == strings.ToLower(f) { |
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225 return av.Value |
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226 } |
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227 } |
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228 } |
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229 } |
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230 } |
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231 return "" |
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232 } |
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233 |
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234 // FeaturesPerPage returns the number of features per page. |
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235 // Returns if paging is not supported by the operation. |
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236 func (op *Operation) FeaturesPerPage() (int, bool) { |
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237 for _, c := range op.Constraints { |
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238 if c.Name == "CountDefault" { |
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239 if c.DefaultValue != nil { |
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240 if v, err := strconv.Atoi(c.DefaultValue.Value); err == nil { |
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241 return v, true |
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242 } |
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243 } |
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244 for _, av := range c.AllowedValues.Values { |
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245 if v, err := strconv.Atoi(av.Value); err == nil { |
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246 return v, true |
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247 } |
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248 |
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249 } |
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250 } |
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251 } |
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252 return 0, false |
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253 } |
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254 |
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255 // FindFeatureType searches the layers for a given name. |
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256 // Returns nil if not found. |
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257 func (c *Capabilities) FindFeatureType(name string) *FeatureType { |
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258 for _, ft := range c.FeatureTypeList.FeatureTypes { |
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259 if ft.Name == name { |
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260 return ft |
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261 } |
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262 } |
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263 return nil |
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264 } |
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265 |
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266 // FindParameter searches for named parameter. Returns nil |
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267 // if not found. |
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268 func (op *Operation) FindParameter(name string) *Parameter { |
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269 for _, p := range op.Parameters { |
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270 if p.Name == name { |
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271 return p |
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272 } |
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273 } |
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274 return nil |
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275 } |
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276 |
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277 // WFS200 is dotted version string of version 2.0.0. |
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278 const WFS200 = "2.0.0" |
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279 |
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280 var versionRe = regexp.MustCompile(`(\d+)\.(\d+)\.(\d+)`) |
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281 |
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282 func versionIsLess(a, b string) bool { |
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283 am := versionRe.FindStringSubmatch(a) |
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284 bm := versionRe.FindStringSubmatch(b) |
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285 |
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286 var n int |
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287 if len(am) < len(bm) { |
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288 n = len(am) |
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289 } else { |
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290 n = len(bm) |
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291 } |
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292 n-- |
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293 |
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294 for i := 0; i < n; i++ { |
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295 ai, _ := strconv.Atoi(am[i+1]) |
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296 bi, _ := strconv.Atoi(bm[i+1]) |
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297 switch { |
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298 case ai < bi: |
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299 return true |
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300 case ai > bi: |
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301 return false |
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302 } |
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303 } |
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304 return false |
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305 } |
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306 |
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307 func maxVersion(a, b string) string { |
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308 am := versionRe.FindStringSubmatch(a) |
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309 bm := versionRe.FindStringSubmatch(b) |
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310 |
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311 var n int |
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312 if len(am) < len(bm) { |
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313 n = len(am) |
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314 } else { |
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315 n = len(bm) |
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316 } |
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317 n-- |
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318 |
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319 for i := 0; i < n; i++ { |
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320 ai, _ := strconv.Atoi(am[i+1]) |
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321 bi, _ := strconv.Atoi(bm[i+1]) |
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322 switch { |
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323 case ai > bi: |
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324 return a |
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325 case bi > ai: |
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326 return b |
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327 } |
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328 } |
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329 return a |
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330 } |
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331 |
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332 // HighestWFSVersion figures out the highest supported WFS version. |
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333 // Defaults to def. |
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334 func (c *Capabilities) HighestWFSVersion(def string) string { |
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335 op := c.FindOperation("GetCapabilities") |
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336 if op == nil { |
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337 return def |
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338 } |
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339 p := op.FindParameter("AcceptVersions") |
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340 if p == nil { |
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341 return def |
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342 } |
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343 if len(p.AllowedValues.Values) == 0 { |
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344 return def |
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345 } |
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346 |
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347 max := p.AllowedValues.Values[0].Value |
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348 for _, v := range p.AllowedValues.Values[1:] { |
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349 max = maxVersion(max, v.Value) |
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350 } |
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351 |
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352 return max |
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353 } |
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354 |
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355 var ( |
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356 // ErrInvalidCRS is returned if a given string is not valid CRS URN. |
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357 ErrInvalidCRS = errors.New("invalid CRS string") |
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358 crsRe = regexp.MustCompile(`urn:ogc:def:crs:EPSG:[^:]*:(\d+)`) |
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359 ) |
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360 |
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361 // CRSToEPSG extracts the EPSG code from a given CRS URN string. |
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362 func CRSToEPSG(s string) (int, error) { |
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363 m := crsRe.FindStringSubmatch(s) |
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364 if m == nil { |
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365 return 0, ErrInvalidCRS |
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366 } |
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367 return strconv.Atoi(m[1]) |
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368 } |
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369 |
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370 // ParseCapabilities constructs a capabilities document from an io.Reader. |
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371 func ParseCapabilities(r io.Reader) (*Capabilities, error) { |
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372 |
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373 decoder := xml.NewDecoder(r) |
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374 decoder.CharsetReader = charset.NewReaderLabel |
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375 |
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376 var capabilities Capabilities |
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377 |
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378 if err := decoder.Decode(&capabilities); err != nil { |
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379 return nil, err |
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380 } |
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381 |
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382 return &capabilities, nil |
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383 } |