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util.dataforms: Support XEP-0122 validation
On par with what can be generated, for symetry.
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1 | -- Prosody IM |
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2 | -- Copyright (C) 2008-2010 Matthew Wild |
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3 | -- Copyright (C) 2008-2010 Waqas Hussain |
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4 | -- |
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5 | -- This project is MIT/X11 licensed. Please see the |
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6 | -- COPYING file in the source package for more information. |
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7 | -- |
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8 | |
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9 | local setmetatable = setmetatable; |
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10 | local ipairs = ipairs; |
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11 | local type, next = type, next; |
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12 | local tonumber = tonumber; |
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13 | local tostring = tostring; |
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14 | local t_concat = table.concat; |
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15 | local st = require "util.stanza"; |
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16 | local jid_prep = require "util.jid".prep; |
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17 | |
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18 | local _ENV = nil; |
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19 | -- luacheck: std none |
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20 | |
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21 | local xmlns_forms = 'jabber:x:data'; |
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22 | local xmlns_validate = 'http://jabber.org/protocol/xdata-validate'; |
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23 | |
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24 | local form_t = {}; |
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25 | local form_mt = { __index = form_t }; |
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26 | |
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27 | local function new(layout) |
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28 | return setmetatable(layout, form_mt); |
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29 | end |
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30 | |
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31 | local function from_stanza(stanza) |
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32 | local layout = { |
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33 | title = stanza:get_child_text("title"); |
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34 | instructions = stanza:get_child_text("instructions"); |
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35 | }; |
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36 | for tag in stanza:childtags("field") do |
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37 | local field = { |
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38 | name = tag.attr.var; |
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39 | label = tag.attr.label; |
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40 | type = tag.attr.type; |
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41 | required = tag:get_child("required") and true or nil; |
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42 | value = tag:get_child_text("value"); |
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43 | }; |
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44 | layout[#layout+1] = field; |
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45 | if field.type then |
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46 | local value = {}; |
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47 | if field.type:match"list%-" then |
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48 | for tag in tag:childtags("option") do |
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49 | value[#value+1] = { label = tag.attr.label, value = tag:get_child_text("value") }; |
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50 | end |
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51 | for tag in tag:childtags("value") do |
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52 | value[#value+1] = { label = tag.attr.label, value = tag:get_text(), default = true }; |
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53 | end |
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54 | elseif field.type:match"%-multi" then |
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55 | for tag in tag:childtags("value") do |
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56 | value[#value+1] = tag.attr.label and { label = tag.attr.label, value = tag:get_text() } or tag:get_text(); |
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57 | end |
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58 | if field.type == "text-multi" then |
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59 | field.value = t_concat(value, "\n"); |
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60 | else |
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61 | field.value = value; |
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62 | end |
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63 | end |
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64 | end |
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65 | local datatype_tag = tag:get_child("validate", xmlns_validate); |
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66 | if datatype_tag then |
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67 | field.datatype = datatype.attr.datatype; |
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68 | local range_tag = datatype_tag:get_child("range"); |
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69 | if range_tag then |
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70 | field.range_min = tonumber(range_tag.attr.min); |
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71 | field.range_max = tonumber(range_tag.attr.max); |
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72 | end |
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73 | end |
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74 | |
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75 | end |
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76 | return new(layout); |
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77 | end |
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78 | |
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79 | function form_t.form(layout, data, formtype) |
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80 | if not formtype then formtype = "form" end |
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81 | local form = st.stanza("x", { xmlns = xmlns_forms, type = formtype }); |
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82 | if formtype == "cancel" then |
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83 | return form; |
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84 | end |
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85 | if formtype ~= "submit" then |
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86 | if layout.title then |
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87 | form:tag("title"):text(layout.title):up(); |
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88 | end |
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89 | if layout.instructions then |
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90 | form:tag("instructions"):text(layout.instructions):up(); |
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91 | end |
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92 | end |
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93 | for _, field in ipairs(layout) do |
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94 | local field_type = field.type or "text-single"; |
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95 | -- Add field tag |
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96 | form:tag("field", { type = field_type, var = field.var or field.name, label = formtype ~= "submit" and field.label or nil }); |
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97 | |
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98 | if formtype ~= "submit" then |
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99 | if field.desc then |
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100 | form:text_tag("desc", field.desc); |
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101 | end |
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102 | end |
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103 | |
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104 | if formtype == "form" and field.datatype then |
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105 | form:tag("validate", { xmlns = xmlns_validate, datatype = field.datatype }); |
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106 | if field.range_min or field.range_max then |
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107 | form:tag("range", { |
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108 | min = field.range_min and tostring(field.range_min), |
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109 | max = field.range_max and tostring(field.range_max), |
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110 | }):up(); |
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111 | end |
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112 | -- <basic/> assumed |
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113 | form:up(); |
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114 | end |
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115 | |
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116 | |
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117 | local value = field.value; |
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118 | local options = field.options; |
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119 | |
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120 | if data and data[field.name] ~= nil then |
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121 | value = data[field.name]; |
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122 | |
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123 | if formtype == "form" and type(value) == "table" |
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124 | and (field_type == "list-single" or field_type == "list-multi") then |
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125 | -- Allow passing dynamically generated options as values |
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126 | options, value = value, nil; |
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127 | end |
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128 | end |
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129 | |
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130 | if formtype == "form" and options then |
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131 | local defaults = {}; |
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132 | for _, val in ipairs(options) do |
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133 | if type(val) == "table" then |
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134 | form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up(); |
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135 | if val.default then |
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136 | defaults[#defaults+1] = val.value; |
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137 | end |
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138 | else |
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139 | form:tag("option", { label= val }):tag("value"):text(val):up():up(); |
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140 | end |
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141 | end |
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142 | if not value then |
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143 | if field_type == "list-single" then |
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144 | value = defaults[1]; |
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145 | elseif field_type == "list-multi" then |
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146 | value = defaults; |
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147 | end |
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148 | end |
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149 | end |
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150 | |
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151 | if value ~= nil then |
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152 | if type(value) == "number" then |
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153 | -- TODO validate that this is ok somehow, eg check field.datatype |
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154 | value = ("%g"):format(value); |
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155 | end |
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156 | -- Add value, depending on type |
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157 | if field_type == "hidden" then |
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158 | if type(value) == "table" then |
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159 | -- Assume an XML snippet |
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160 | form:tag("value") |
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161 | :add_child(value) |
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162 | :up(); |
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163 | else |
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164 | form:tag("value"):text(value):up(); |
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165 | end |
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166 | elseif field_type == "boolean" then |
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167 | form:tag("value"):text((value and "1") or "0"):up(); |
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168 | elseif field_type == "fixed" then |
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169 | form:tag("value"):text(value):up(); |
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170 | elseif field_type == "jid-multi" then |
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171 | for _, jid in ipairs(value) do |
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172 | form:tag("value"):text(jid):up(); |
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173 | end |
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174 | elseif field_type == "jid-single" then |
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175 | form:tag("value"):text(value):up(); |
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176 | elseif field_type == "text-single" or field_type == "text-private" then |
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177 | form:tag("value"):text(value):up(); |
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178 | elseif field_type == "text-multi" then |
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179 | -- Split into multiple <value> tags, one for each line |
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180 | for line in value:gmatch("([^\r\n]+)\r?\n*") do |
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181 | form:tag("value"):text(line):up(); |
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182 | end |
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183 | elseif field_type == "list-single" then |
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184 | form:tag("value"):text(value):up(); |
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185 | elseif field_type == "list-multi" then |
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186 | for _, val in ipairs(value) do |
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187 | form:tag("value"):text(val):up(); |
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188 | end |
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189 | end |
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190 | end |
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191 | |
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192 | local media = field.media; |
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193 | if media then |
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194 | form:tag("media", { xmlns = "urn:xmpp:media-element", height = ("%g"):format(media.height), width = ("%g"):format(media.width) }); |
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195 | for _, val in ipairs(media) do |
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196 | form:tag("uri", { type = val.type }):text(val.uri):up() |
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197 | end |
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198 | form:up(); |
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199 | end |
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200 | |
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201 | if formtype == "form" and field.required then |
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202 | form:tag("required"):up(); |
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203 | end |
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204 | |
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205 | -- Jump back up to list of fields |
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206 | form:up(); |
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207 | end |
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208 | return form; |
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209 | end |
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210 | |
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211 | local field_readers = {}; |
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212 | local data_validators = {}; |
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213 | |
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214 | function form_t.data(layout, stanza, current) |
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215 | local data = {}; |
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216 | local errors = {}; |
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217 | local present = {}; |
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218 | |
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219 | for _, field in ipairs(layout) do |
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220 | local tag; |
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221 | for field_tag in stanza:childtags("field") do |
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222 | if (field.var or field.name) == field_tag.attr.var then |
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223 | tag = field_tag; |
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224 | break; |
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225 | end |
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226 | end |
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227 | |
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228 | if not tag then |
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229 | if current and current[field.name] ~= nil then |
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230 | data[field.name] = current[field.name]; |
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231 | elseif field.required then |
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232 | errors[field.name] = "Required value missing"; |
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233 | end |
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234 | elseif field.name then |
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235 | present[field.name] = true; |
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236 | local reader = field_readers[field.type]; |
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237 | if reader then |
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238 | local value, err = reader(tag, field.required); |
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239 | local validator = field.datatype and data_validators[field.datatype]; |
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240 | if value ~= nil and validator then |
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241 | local valid, ret = validator(value, field); |
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242 | if valid then |
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243 | value = ret; |
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244 | else |
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245 | value, err = nil, ret or ("Invalid value for data of type " .. field.datatype); |
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246 | end |
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247 | end |
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248 | data[field.name], errors[field.name] = value, err; |
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249 | end |
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250 | end |
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251 | end |
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252 | if next(errors) then |
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253 | return data, errors, present; |
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254 | end |
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255 | return data, nil, present; |
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256 | end |
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257 | |
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258 | local function simple_text(field_tag, required) |
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259 | local data = field_tag:get_child_text("value"); |
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260 | -- XEP-0004 does not say if an empty string is acceptable for a required value |
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261 | -- so we will follow HTML5 which says that empty string means missing |
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262 | if required and (data == nil or data == "") then |
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263 | return nil, "Required value missing"; |
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264 | end |
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265 | return data; -- Return whatever get_child_text returned, even if empty string |
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266 | end |
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267 | |
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268 | field_readers["text-single"] = simple_text; |
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269 | |
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270 | field_readers["text-private"] = simple_text; |
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271 | |
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272 | field_readers["jid-single"] = |
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273 | function (field_tag, required) |
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274 | local raw_data, err = simple_text(field_tag, required); |
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275 | if not raw_data then return raw_data, err; end |
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276 | local data = jid_prep(raw_data); |
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277 | if not data then |
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278 | return nil, "Invalid JID: " .. raw_data; |
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279 | end |
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280 | return data; |
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281 | end |
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282 | |
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283 | field_readers["jid-multi"] = |
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284 | function (field_tag, required) |
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285 | local result = {}; |
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286 | local err = {}; |
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287 | for value_tag in field_tag:childtags("value") do |
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288 | local raw_value = value_tag:get_text(); |
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289 | local value = jid_prep(raw_value); |
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290 | result[#result+1] = value; |
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291 | if raw_value and not value then |
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292 | err[#err+1] = ("Invalid JID: " .. raw_value); |
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293 | end |
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294 | end |
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295 | if #result > 0 then |
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296 | return result, (#err > 0 and t_concat(err, "\n") or nil); |
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297 | elseif required then |
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298 | return nil, "Required value missing"; |
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299 | end |
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300 | end |
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301 | |
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302 | field_readers["list-multi"] = |
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303 | function (field_tag, required) |
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304 | local result = {}; |
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305 | for value in field_tag:childtags("value") do |
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306 | result[#result+1] = value:get_text(); |
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307 | end |
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308 | if #result > 0 then |
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309 | return result; |
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310 | elseif required then |
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311 | return nil, "Required value missing"; |
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312 | end |
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313 | end |
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314 | |
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315 | field_readers["text-multi"] = |
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316 | function (field_tag, required) |
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317 | local data, err = field_readers["list-multi"](field_tag, required); |
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318 | if data then |
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319 | data = t_concat(data, "\n"); |
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320 | end |
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321 | return data, err; |
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322 | end |
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323 | |
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324 | field_readers["list-single"] = simple_text; |
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325 | |
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326 | local boolean_values = { |
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327 | ["1"] = true, ["true"] = true, |
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328 | ["0"] = false, ["false"] = false, |
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329 | }; |
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330 | |
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331 | field_readers["boolean"] = |
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332 | function (field_tag, required) |
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333 | local raw_value, err = simple_text(field_tag, required); |
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334 | if not raw_value then return raw_value, err; end |
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335 | local value = boolean_values[raw_value]; |
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336 | if value == nil then |
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337 | return nil, "Invalid boolean representation:" .. raw_value; |
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338 | end |
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339 | return value; |
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340 | end |
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341 | |
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342 | field_readers["hidden"] = |
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343 | function (field_tag) |
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344 | return field_tag:get_child_text("value"); |
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345 | end |
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346 | |
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347 | data_validators["xs:integer"] = |
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348 | function (data, field) |
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349 | local n = tonumber(data); |
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350 | if not n then |
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351 | return false, "not a number"; |
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352 | elseif n % 1 ~= 0 then |
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353 | return false, "not an integer"; |
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354 | end |
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355 | if field.range_max and n > field.range_max then |
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356 | return false, "out of bounds"; |
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357 | elseif field.range_min and n < field.range_min then |
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358 | return false, "out of bounds"; |
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359 | end |
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360 | return true, n; |
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361 | end |
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362 | |
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363 | |
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364 | local function get_form_type(form) |
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365 | if not st.is_stanza(form) then |
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366 | return nil, "not a stanza object"; |
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367 | elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then |
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368 | return nil, "not a dataform element"; |
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369 | end |
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370 | for field in form:childtags("field") do |
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371 | if field.attr.var == "FORM_TYPE" then |
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372 | return field:get_child_text("value"); |
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373 | end |
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374 | end |
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375 | return ""; |
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376 | end |
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377 | |
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378 | return { |
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379 | new = new; |
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380 | from_stanza = from_stanza; |
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381 | get_type = get_form_type; |
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382 | }; |
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383 | |
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384 | |
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385 | --[=[ |
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386 | |
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387 | Layout: |
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388 | { |
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389 | |
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390 | title = "MUC Configuration", |
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391 | instructions = [[Use this form to configure options for this MUC room.]], |
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392 | |
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393 | { name = "FORM_TYPE", type = "hidden", required = true }; |
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394 | { name = "field-name", type = "field-type", required = false }; |
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395 | } |
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396 | |
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397 | |
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398 | --]=] |