prosody
e5eb36ee07a2
util/dataforms.lua

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util/dataforms.lua @ 9121:e5eb36ee07a2

util.dataforms: Allow passing the current values to be used in stead of omitted fields
author Kim Alvefur <zash@zash.se>
date Sun, 05 Aug 2018 15:50:06 +0200
parent 9111:bc7473fb7ad3
child 9242:68694c1bd960
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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 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 = field.value;
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54 local options = field.options;
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55
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56 if data and data[field.name] ~= nil then
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57 value = data[field.name];
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58
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59 if formtype == "form" and type(value) == "table"
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60 and (field_type == "list-single" or field_type == "list-multi") then
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61 -- Allow passing dynamically generated options as values
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62 options, value = value, nil;
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63 end
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64 end
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65
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66 if formtype == "form" and options then
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67 local defaults = {};
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68 for _, val in ipairs(options) do
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69 if type(val) == "table" then
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70 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
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71 if val.default then
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72 defaults[#defaults+1] = val.value;
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73 end
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74 else
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75 form:tag("option", { label= val }):tag("value"):text(val):up():up();
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76 end
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77 end
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78 if not value then
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79 if field_type == "list-single" then
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80 value = defaults[1];
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81 elseif field_type == "list-multi" then
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82 value = defaults;
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83 end
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84 end
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85 end
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86
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87 if value ~= nil then
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88 -- Add value, depending on type
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89 if field_type == "hidden" then
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90 if type(value) == "table" then
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91 -- Assume an XML snippet
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92 form:tag("value")
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93 :add_child(value)
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94 :up();
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95 else
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96 form:tag("value"):text(value):up();
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97 end
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98 elseif field_type == "boolean" then
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99 form:tag("value"):text((value and "1") or "0"):up();
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100 elseif field_type == "fixed" then
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101 form:tag("value"):text(value):up();
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102 elseif field_type == "jid-multi" then
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103 for _, jid in ipairs(value) do
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104 form:tag("value"):text(jid):up();
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105 end
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106 elseif field_type == "jid-single" then
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107 form:tag("value"):text(value):up();
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108 elseif field_type == "text-single" or field_type == "text-private" then
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109 form:tag("value"):text(value):up();
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110 elseif field_type == "text-multi" then
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111 -- Split into multiple <value> tags, one for each line
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112 for line in value:gmatch("([^\r\n]+)\r?\n*") do
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113 form:tag("value"):text(line):up();
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114 end
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115 elseif field_type == "list-single" then
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116 form:tag("value"):text(value):up();
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117 elseif field_type == "list-multi" then
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118 for _, val in ipairs(value) do
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119 form:tag("value"):text(val):up();
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120 end
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121 end
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122 end
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123
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124 local media = field.media;
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125 if media then
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126 form:tag("media", { xmlns = "urn:xmpp:media-element", height = media.height, width = media.width });
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127 for _, val in ipairs(media) do
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128 form:tag("uri", { type = val.type }):text(val.uri):up()
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129 end
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130 form:up();
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131 end
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132
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133 if formtype == "form" and field.required then
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134 form:tag("required"):up();
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135 end
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136
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137 -- Jump back up to list of fields
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138 form:up();
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139 end
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140 return form;
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141 end
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142
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143 local field_readers = {};
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144
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145 function form_t.data(layout, stanza, current)
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146 local data = {};
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147 local errors = {};
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148 local present = {};
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149
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150 for _, field in ipairs(layout) do
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151 local tag;
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152 for field_tag in stanza:childtags("field") do
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153 if field.name == field_tag.attr.var then
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154 tag = field_tag;
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155 break;
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156 end
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157 end
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158
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159 if not tag then
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160 if current and current[field.name] ~= nil then
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161 data[field.name] = current[field.name];
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162 elseif field.required then
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163 errors[field.name] = "Required value missing";
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164 end
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165 elseif field.name then
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166 present[field.name] = true;
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167 local reader = field_readers[field.type];
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168 if reader then
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169 data[field.name], errors[field.name] = reader(tag, field.required);
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170 end
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171 end
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172 end
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173 if next(errors) then
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174 return data, errors, present;
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175 end
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176 return data, nil, present;
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177 end
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178
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179 local function simple_text(field_tag, required)
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180 local data = field_tag:get_child_text("value");
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181 -- XEP-0004 does not say if an empty string is acceptable for a required value
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182 -- so we will follow HTML5 which says that empty string means missing
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183 if required and (data == nil or data == "") then
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184 return nil, "Required value missing";
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185 end
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186 return data; -- Return whatever get_child_text returned, even if empty string
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187 end
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188
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189 field_readers["text-single"] = simple_text;
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190
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191 field_readers["text-private"] = simple_text;
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192
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193 field_readers["jid-single"] =
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194 function (field_tag, required)
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195 local raw_data, err = simple_text(field_tag, required);
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196 if not raw_data then return raw_data, err; end
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197 local data = jid_prep(raw_data);
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198 if not data then
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199 return nil, "Invalid JID: " .. raw_data;
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200 end
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201 return data;
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202 end
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203
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204 field_readers["jid-multi"] =
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205 function (field_tag, required)
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206 local result = {};
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207 local err = {};
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208 for value_tag in field_tag:childtags("value") do
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209 local raw_value = value_tag:get_text();
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210 local value = jid_prep(raw_value);
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211 result[#result+1] = value;
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212 if raw_value and not value then
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213 err[#err+1] = ("Invalid JID: " .. raw_value);
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214 end
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215 end
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216 if #result > 0 then
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217 return result, (#err > 0 and t_concat(err, "\n") or nil);
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218 elseif required then
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219 return nil, "Required value missing";
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220 end
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221 end
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222
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223 field_readers["list-multi"] =
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224 function (field_tag, required)
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225 local result = {};
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226 for value in field_tag:childtags("value") do
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227 result[#result+1] = value:get_text();
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228 end
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229 if #result > 0 then
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230 return result;
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231 elseif required then
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232 return nil, "Required value missing";
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233 end
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234 end
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235
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236 field_readers["text-multi"] =
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237 function (field_tag, required)
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238 local data, err = field_readers["list-multi"](field_tag, required);
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239 if data then
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240 data = t_concat(data, "\n");
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241 end
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242 return data, err;
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243 end
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244
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245 field_readers["list-single"] = simple_text;
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246
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247 local boolean_values = {
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248 ["1"] = true, ["true"] = true,
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249 ["0"] = false, ["false"] = false,
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250 };
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251
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252 field_readers["boolean"] =
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253 function (field_tag, required)
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254 local raw_value, err = simple_text(field_tag, required);
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255 if not raw_value then return raw_value, err; end
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256 local value = boolean_values[raw_value];
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257 if value == nil then
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258 return nil, "Invalid boolean representation:" .. raw_value;
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259 end
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260 return value;
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261 end
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262
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263 field_readers["hidden"] =
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264 function (field_tag)
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265 return field_tag:get_child_text("value");
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266 end
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267
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268
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269 local function get_form_type(form)
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270 if not st.is_stanza(form) then
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271 return nil, "not a stanza object";
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272 elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then
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273 return nil, "not a dataform element";
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274 end
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275 for field in form:childtags("field") do
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276 if field.attr.var == "FORM_TYPE" then
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277 return field:get_child_text("value");
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278 end
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279 end
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280 return "";
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281 end
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282
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283 return {
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284 new = new;
8864
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285 get_type = get_form_type;
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286 };
845
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287
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288
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289 --[=[
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290
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291 Layout:
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292 {
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293
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294 title = "MUC Configuration",
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295 instructions = [[Use this form to configure options for this MUC room.]],
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296
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297 { name = "FORM_TYPE", type = "hidden", required = true };
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298 { name = "field-name", type = "field-type", required = false };
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299 }
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300
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301
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302 --]=]