prosody
9d0d1e427b82
util/dataforms.lua

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util/dataforms.lua @ 8960:9d0d1e427b82

mod_announce: Depend on mod_adhoc for consistent behaviour (thanks meaz, Link Mauve)
author Kim Alvefur <zash@zash.se>
date Mon, 02 Jul 2018 23:41:36 +0200
parent 8945:cbeb1a045eb6
child 8984:fa80b3231a02
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rev   line source
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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 local form = st.stanza("x", { xmlns = xmlns_forms, type = formtype or "form" });
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30 if layout.title then
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31 form:tag("title"):text(layout.title):up();
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32 end
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33 if layout.instructions then
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34 form:tag("instructions"):text(layout.instructions):up();
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35 end
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36 for _, field in ipairs(layout) do
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37 local field_type = field.type or "text-single";
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38 -- Add field tag
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39 form:tag("field", { type = field_type, var = field.name, label = field.label });
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40
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41 if field.desc then
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42 form:text_tag("desc", field.desc);
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43 end
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44
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45 local value = (data and data[field.name]) or field.value;
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46
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47 if value then
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48 -- Add value, depending on type
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49 if field_type == "hidden" then
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50 if type(value) == "table" then
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51 -- Assume an XML snippet
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52 form:tag("value")
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53 :add_child(value)
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54 :up();
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55 else
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56 form:tag("value"):text(value):up();
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57 end
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58 elseif field_type == "boolean" then
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59 form:tag("value"):text((value and "1") or "0"):up();
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60 elseif field_type == "fixed" then
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61 form:tag("value"):text(value):up();
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62 elseif field_type == "jid-multi" then
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63 for _, jid in ipairs(value) do
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64 form:tag("value"):text(jid):up();
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65 end
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66 elseif field_type == "jid-single" then
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67 form:tag("value"):text(value):up();
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68 elseif field_type == "text-single" or field_type == "text-private" then
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69 form:tag("value"):text(value):up();
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70 elseif field_type == "text-multi" then
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71 -- Split into multiple <value> tags, one for each line
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72 for line in value:gmatch("([^\r\n]+)\r?\n*") do
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73 form:tag("value"):text(line):up();
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74 end
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75 elseif field_type == "list-single" then
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76 if formtype ~= "result" then
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77 local has_default = false;
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78 for _, val in ipairs(field.options or value) do
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79 if type(val) == "table" then
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80 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
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81 if value == val.value or val.default and (not has_default) then
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82 form:tag("value"):text(val.value):up();
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83 has_default = true;
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84 end
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85 else
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86 form:tag("option", { label= val }):tag("value"):text(val):up():up();
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87 end
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88 end
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89 end
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90 if (field.options or formtype == "result") and value then
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91 form:tag("value"):text(value):up();
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92 end
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93 elseif field_type == "list-multi" then
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94 if formtype ~= "result" then
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95 for _, val in ipairs(field.options or value) do
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96 if type(val) == "table" then
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97 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
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98 if not field.options and val.default then
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99 form:tag("value"):text(val.value):up();
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100 end
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101 else
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102 form:tag("option", { label= val }):tag("value"):text(val):up():up();
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103 end
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104 end
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105 end
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106 if (field.options or formtype == "result") and value then
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107 for _, val in ipairs(value) do
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108 form:tag("value"):text(val):up();
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109 end
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110 end
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111 end
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112 end
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113
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114 local media = field.media;
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115 if media then
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116 form:tag("media", { xmlns = "urn:xmpp:media-element", height = media.height, width = media.width });
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117 for _, val in ipairs(media) do
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118 form:tag("uri", { type = val.type }):text(val.uri):up()
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119 end
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120 form:up();
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121 end
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122
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123 if field.required then
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124 form:tag("required"):up();
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125 end
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126
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127 -- Jump back up to list of fields
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128 form:up();
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129 end
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130 return form;
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131 end
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132
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133 local field_readers = {};
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134
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135 function form_t.data(layout, stanza)
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136 local data = {};
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137 local errors = {};
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138 local present = {};
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139
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140 for _, field in ipairs(layout) do
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141 local tag;
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142 for field_tag in stanza:childtags("field") do
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143 if field.name == field_tag.attr.var then
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144 tag = field_tag;
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145 break;
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146 end
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147 end
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148
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149 if not tag then
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150 if field.required then
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151 errors[field.name] = "Required value missing";
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152 end
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153 else
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154 present[field.name] = true;
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155 local reader = field_readers[field.type];
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156 if reader then
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157 data[field.name], errors[field.name] = reader(tag, field.required);
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158 end
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159 end
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160 end
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161 if next(errors) then
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162 return data, errors, present;
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163 end
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164 return data, nil, present;
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165 end
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166
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167 local function simple_text(field_tag, required)
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168 local data = field_tag:get_child_text("value");
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169 -- XEP-0004 does not say if an empty string is acceptable for a required value
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170 -- so we will follow HTML5 which says that empty string means missing
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171 if required and (data == nil or data == "") then
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172 return nil, "Required value missing";
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173 end
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174 return data; -- Return whatever get_child_text returned, even if empty string
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175 end
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176
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177 field_readers["text-single"] = simple_text;
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178
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179 field_readers["text-private"] = simple_text;
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180
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181 field_readers["jid-single"] =
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182 function (field_tag, required)
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183 local raw_data, err = simple_text(field_tag, required);
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184 if not raw_data then return raw_data, err; end
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185 local data = jid_prep(raw_data);
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186 if not data then
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187 return nil, "Invalid JID: " .. raw_data;
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188 end
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189 return data;
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190 end
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191
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192 field_readers["jid-multi"] =
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193 function (field_tag, required)
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194 local result = {};
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195 local err = {};
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196 for value_tag in field_tag:childtags("value") do
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197 local raw_value = value_tag:get_text();
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198 local value = jid_prep(raw_value);
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199 result[#result+1] = value;
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200 if raw_value and not value then
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201 err[#err+1] = ("Invalid JID: " .. raw_value);
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202 end
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203 end
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204 if #result > 0 then
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205 return result, (#err > 0 and t_concat(err, "\n") or nil);
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206 elseif required then
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207 return nil, "Required value missing";
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208 end
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209 end
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210
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211 field_readers["list-multi"] =
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212 function (field_tag, required)
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213 local result = {};
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214 for value in field_tag:childtags("value") do
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215 result[#result+1] = value:get_text();
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216 end
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217 if #result > 0 then
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218 return result;
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219 elseif required then
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220 return nil, "Required value missing";
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221 end
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222 end
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223
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224 field_readers["text-multi"] =
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225 function (field_tag, required)
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226 local data, err = field_readers["list-multi"](field_tag, required);
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227 if data then
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228 data = t_concat(data, "\n");
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229 end
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230 return data, err;
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231 end
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232
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233 field_readers["list-single"] = simple_text;
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234
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235 local boolean_values = {
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236 ["1"] = true, ["true"] = true,
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237 ["0"] = false, ["false"] = false,
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238 };
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239
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240 field_readers["boolean"] =
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241 function (field_tag, required)
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242 local raw_value, err = simple_text(field_tag, required);
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243 if not raw_value then return raw_value, err; end
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244 local value = boolean_values[raw_value];
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245 if value == nil then
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246 return nil, "Invalid boolean representation:" .. raw_value;
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247 end
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248 return value;
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249 end
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250
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251 field_readers["hidden"] =
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252 function (field_tag)
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253 return field_tag:get_child_text("value");
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254 end
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255
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256
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257 local function get_form_type(form)
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258 if not st.is_stanza(form) then
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259 return nil, "not a stanza object";
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260 elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then
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261 return nil, "not a dataform element";
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262 end
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263 for field in form:childtags("field") do
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264 if field.attr.var == "FORM_TYPE" then
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265 return field:get_child_text("value");
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266 end
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267 end
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268 return "";
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269 end
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270
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271 return {
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272 new = new;
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273 get_type = get_form_type;
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274 };
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275
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276
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277 --[=[
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278
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279 Layout:
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280 {
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281
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282 title = "MUC Configuration",
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283 instructions = [[Use this form to configure options for this MUC room.]],
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284
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285 { name = "FORM_TYPE", type = "hidden", required = true };
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286 { name = "field-name", type = "field-type", required = false };
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287 }
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288
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289
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290 --]=]