prosody
56c52cb4d44e
util/dataforms.lua

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util/dataforms.lua @ 9090:56c52cb4d44e

util.dataforms: Exclude descriptive text fields from forms of type 'submit' The receiving end presumably already have the original form, so these potentially long text fields are of little value.
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 21:45:55 +0200
parent 9089:3a7a0b9f42f3
child 9091:519dea077d20
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rev   line source
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Matthew Wild <mwild1@gmail.com>
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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 t_concat = table.concat;
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13 local st = require "util.stanza";
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14 local jid_prep = require "util.jid".prep;
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15
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16 local _ENV = nil;
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17 -- luacheck: std none
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18
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19 local xmlns_forms = 'jabber:x:data';
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20
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21 local form_t = {};
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22 local form_mt = { __index = form_t };
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23
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24 local function new(layout)
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25 return setmetatable(layout, form_mt);
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26 end
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27
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28 function form_t.form(layout, data, formtype)
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29 if not formtype then formtype = "form" end
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30 local form = st.stanza("x", { xmlns = xmlns_forms, type = formtype });
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31 if formtype == "cancel" then
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32 return form;
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33 end
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34 if formtype ~= "submit" then
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35 if layout.title then
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36 form:tag("title"):text(layout.title):up();
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37 end
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38 if layout.instructions then
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39 form:tag("instructions"):text(layout.instructions):up();
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40 end
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41 end
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42 for _, field in ipairs(layout) do
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43 local field_type = field.type or "text-single";
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44 -- Add field tag
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45 form:tag("field", { type = field_type, var = field.name, label = formtype ~= "submit" and field.label or nil });
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46
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47 if formtype ~= "submit" then
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48 if field.desc then
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49 form:text_tag("desc", field.desc);
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50 end
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51 end
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52
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53 local value;
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54 if data and data[field.name] ~= nil then
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55 value = data[field.name];
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56 else
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57 value = field.value;
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58 end
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59
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60 if formtype == "form" and field.options then
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61 local defaults = {};
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62 for _, val in ipairs(field.options) do
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63 if type(val) == "table" then
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64 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
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65 if val.default then
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66 defaults[#defaults+1] = val.value;
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67 end
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68 else
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69 form:tag("option", { label= val }):tag("value"):text(val):up():up();
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70 end
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71 end
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72 if not value then
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73 if field_type == "list-single" then
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74 value = defaults[1];
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75 elseif field_type == "list-multi" then
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76 value = defaults;
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77 end
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78 end
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79 end
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80
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81 if value ~= nil then
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82 -- Add value, depending on type
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83 if field_type == "hidden" then
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84 if type(value) == "table" then
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85 -- Assume an XML snippet
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86 form:tag("value")
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87 :add_child(value)
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88 :up();
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89 else
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90 form:tag("value"):text(value):up();
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91 end
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92 elseif field_type == "boolean" then
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93 form:tag("value"):text((value and "1") or "0"):up();
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94 elseif field_type == "fixed" then
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95 form:tag("value"):text(value):up();
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96 elseif field_type == "jid-multi" then
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97 for _, jid in ipairs(value) do
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98 form:tag("value"):text(jid):up();
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99 end
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100 elseif field_type == "jid-single" then
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101 form:tag("value"):text(value):up();
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102 elseif field_type == "text-single" or field_type == "text-private" then
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103 form:tag("value"):text(value):up();
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104 elseif field_type == "text-multi" then
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105 -- Split into multiple <value> tags, one for each line
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106 for line in value:gmatch("([^\r\n]+)\r?\n*") do
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107 form:tag("value"):text(line):up();
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108 end
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109 elseif field_type == "list-single" then
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110 form:tag("value"):text(value):up();
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111 elseif field_type == "list-multi" then
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112 for _, val in ipairs(value) do
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113 form:tag("value"):text(val):up();
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114 end
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115 end
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116 end
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117
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118 local media = field.media;
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119 if media then
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120 form:tag("media", { xmlns = "urn:xmpp:media-element", height = media.height, width = media.width });
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121 for _, val in ipairs(media) do
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122 form:tag("uri", { type = val.type }):text(val.uri):up()
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123 end
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124 form:up();
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125 end
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126
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127 if formtype == "form" and field.required then
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128 form:tag("required"):up();
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129 end
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130
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131 -- Jump back up to list of fields
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132 form:up();
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133 end
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134 return form;
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135 end
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136
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137 local field_readers = {};
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138
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139 function form_t.data(layout, stanza)
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140 local data = {};
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141 local errors = {};
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142 local present = {};
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143
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144 for _, field in ipairs(layout) do
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145 local tag;
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146 for field_tag in stanza:childtags("field") do
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147 if field.name == field_tag.attr.var then
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148 tag = field_tag;
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149 break;
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150 end
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151 end
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152
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153 if not tag then
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154 if field.required then
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155 errors[field.name] = "Required value missing";
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156 end
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157 elseif field.name then
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158 present[field.name] = true;
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159 local reader = field_readers[field.type];
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160 if reader then
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161 data[field.name], errors[field.name] = reader(tag, field.required);
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162 end
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163 end
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164 end
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165 if next(errors) then
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166 return data, errors, present;
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167 end
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168 return data, nil, present;
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169 end
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170
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171 local function simple_text(field_tag, required)
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172 local data = field_tag:get_child_text("value");
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173 -- XEP-0004 does not say if an empty string is acceptable for a required value
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174 -- so we will follow HTML5 which says that empty string means missing
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175 if required and (data == nil or data == "") then
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176 return nil, "Required value missing";
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177 end
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178 return data; -- Return whatever get_child_text returned, even if empty string
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179 end
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180
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181 field_readers["text-single"] = simple_text;
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182
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183 field_readers["text-private"] = simple_text;
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184
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185 field_readers["jid-single"] =
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186 function (field_tag, required)
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187 local raw_data, err = simple_text(field_tag, required);
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188 if not raw_data then return raw_data, err; end
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189 local data = jid_prep(raw_data);
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190 if not data then
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191 return nil, "Invalid JID: " .. raw_data;
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192 end
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193 return data;
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194 end
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195
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196 field_readers["jid-multi"] =
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197 function (field_tag, required)
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198 local result = {};
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199 local err = {};
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200 for value_tag in field_tag:childtags("value") do
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201 local raw_value = value_tag:get_text();
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202 local value = jid_prep(raw_value);
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203 result[#result+1] = value;
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204 if raw_value and not value then
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205 err[#err+1] = ("Invalid JID: " .. raw_value);
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206 end
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207 end
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208 if #result > 0 then
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209 return result, (#err > 0 and t_concat(err, "\n") or nil);
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210 elseif required then
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211 return nil, "Required value missing";
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212 end
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213 end
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214
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215 field_readers["list-multi"] =
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216 function (field_tag, required)
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217 local result = {};
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218 for value in field_tag:childtags("value") do
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219 result[#result+1] = value:get_text();
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220 end
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221 if #result > 0 then
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222 return result;
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223 elseif required then
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224 return nil, "Required value missing";
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225 end
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226 end
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227
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228 field_readers["text-multi"] =
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229 function (field_tag, required)
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230 local data, err = field_readers["list-multi"](field_tag, required);
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231 if data then
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232 data = t_concat(data, "\n");
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233 end
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234 return data, err;
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235 end
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236
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237 field_readers["list-single"] = simple_text;
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238
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239 local boolean_values = {
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240 ["1"] = true, ["true"] = true,
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241 ["0"] = false, ["false"] = false,
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242 };
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243
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244 field_readers["boolean"] =
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245 function (field_tag, required)
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246 local raw_value, err = simple_text(field_tag, required);
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247 if not raw_value then return raw_value, err; end
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248 local value = boolean_values[raw_value];
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249 if value == nil then
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250 return nil, "Invalid boolean representation:" .. raw_value;
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251 end
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252 return value;
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253 end
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254
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255 field_readers["hidden"] =
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256 function (field_tag)
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257 return field_tag:get_child_text("value");
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258 end
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259
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260
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261 local function get_form_type(form)
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262 if not st.is_stanza(form) then
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263 return nil, "not a stanza object";
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264 elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then
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265 return nil, "not a dataform element";
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266 end
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267 for field in form:childtags("field") do
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268 if field.attr.var == "FORM_TYPE" then
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269 return field:get_child_text("value");
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270 end
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271 end
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272 return "";
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273 end
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274
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275 return {
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276 new = new;
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277 get_type = get_form_type;
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278 };
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279
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280
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281 --[=[
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282
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283 Layout:
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284 {
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285
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286 title = "MUC Configuration",
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287 instructions = [[Use this form to configure options for this MUC room.]],
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288
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289 { name = "FORM_TYPE", type = "hidden", required = true };
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290 { name = "field-name", type = "field-type", required = false };
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291 }
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292
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293
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294 --]=]