prosody
5110da3a71eb
util/dataforms.lua

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util/dataforms.lua @ 9092:5110da3a71eb

util.dataforms: Allow overriding default options even if the form has such
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 22:24:35 +0200
parent 9091:519dea077d20
child 9094:05979ae1e38a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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;
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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 local options = field.options;
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61 if formtype == "form" and value
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62 and (field_type == "list-single" or field_type == "list-multi") then
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63 -- Allow passing dynamically generated options as values
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64 options, value = value, nil;
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65 end
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66
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67 if formtype == "form" and options then
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68 local defaults = {};
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69 for _, val in ipairs(options) do
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70 if type(val) == "table" then
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71 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
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72 if val.default then
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73 defaults[#defaults+1] = val.value;
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74 end
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75 else
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76 form:tag("option", { label= val }):tag("value"):text(val):up():up();
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77 end
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78 end
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79 if not value then
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80 if field_type == "list-single" then
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81 value = defaults[1];
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82 elseif field_type == "list-multi" then
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83 value = defaults;
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84 end
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85 end
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86 end
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87
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88 if value ~= nil then
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89 -- Add value, depending on type
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90 if field_type == "hidden" then
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91 if type(value) == "table" then
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92 -- Assume an XML snippet
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93 form:tag("value")
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94 :add_child(value)
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95 :up();
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96 else
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97 form:tag("value"):text(value):up();
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98 end
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99 elseif field_type == "boolean" then
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100 form:tag("value"):text((value and "1") or "0"):up();
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101 elseif field_type == "fixed" then
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102 form:tag("value"):text(value):up();
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103 elseif field_type == "jid-multi" then
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104 for _, jid in ipairs(value) do
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105 form:tag("value"):text(jid):up();
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106 end
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107 elseif field_type == "jid-single" then
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108 form:tag("value"):text(value):up();
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109 elseif field_type == "text-single" or field_type == "text-private" then
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110 form:tag("value"):text(value):up();
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111 elseif field_type == "text-multi" then
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112 -- Split into multiple <value> tags, one for each line
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113 for line in value:gmatch("([^\r\n]+)\r?\n*") do
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114 form:tag("value"):text(line):up();
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115 end
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116 elseif field_type == "list-single" then
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117 form:tag("value"):text(value):up();
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118 elseif field_type == "list-multi" then
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119 for _, val in ipairs(value) do
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120 form:tag("value"):text(val):up();
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121 end
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122 end
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123 end
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124
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125 local media = field.media;
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126 if media then
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127 form:tag("media", { xmlns = "urn:xmpp:media-element", height = media.height, width = media.width });
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128 for _, val in ipairs(media) do
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129 form:tag("uri", { type = val.type }):text(val.uri):up()
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130 end
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131 form:up();
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132 end
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133
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134 if formtype == "form" and field.required then
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135 form:tag("required"):up();
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136 end
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137
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138 -- Jump back up to list of fields
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139 form:up();
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140 end
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141 return form;
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142 end
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143
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144 local field_readers = {};
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145
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146 function form_t.data(layout, stanza)
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147 local data = {};
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148 local errors = {};
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149 local present = {};
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150
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151 for _, field in ipairs(layout) do
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152 local tag;
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153 for field_tag in stanza:childtags("field") do
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154 if field.name == field_tag.attr.var then
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155 tag = field_tag;
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156 break;
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157 end
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158 end
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159
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160 if not tag then
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161 if field.required then
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162 errors[field.name] = "Required value missing";
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163 end
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164 elseif field.name then
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165 present[field.name] = true;
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166 local reader = field_readers[field.type];
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167 if reader then
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168 data[field.name], errors[field.name] = reader(tag, field.required);
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169 end
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170 end
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171 end
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172 if next(errors) then
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173 return data, errors, present;
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174 end
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175 return data, nil, present;
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176 end
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177
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178 local function simple_text(field_tag, required)
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179 local data = field_tag:get_child_text("value");
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180 -- XEP-0004 does not say if an empty string is acceptable for a required value
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181 -- so we will follow HTML5 which says that empty string means missing
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182 if required and (data == nil or data == "") then
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183 return nil, "Required value missing";
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184 end
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185 return data; -- Return whatever get_child_text returned, even if empty string
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186 end
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187
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188 field_readers["text-single"] = simple_text;
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189
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190 field_readers["text-private"] = simple_text;
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191
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192 field_readers["jid-single"] =
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193 function (field_tag, required)
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194 local raw_data, err = simple_text(field_tag, required);
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195 if not raw_data then return raw_data, err; end
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196 local data = jid_prep(raw_data);
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197 if not data then
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198 return nil, "Invalid JID: " .. raw_data;
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199 end
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200 return data;
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201 end
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202
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203 field_readers["jid-multi"] =
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204 function (field_tag, required)
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205 local result = {};
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206 local err = {};
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207 for value_tag in field_tag:childtags("value") do
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208 local raw_value = value_tag:get_text();
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209 local value = jid_prep(raw_value);
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210 result[#result+1] = value;
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211 if raw_value and not value then
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212 err[#err+1] = ("Invalid JID: " .. raw_value);
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213 end
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214 end
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215 if #result > 0 then
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216 return result, (#err > 0 and t_concat(err, "\n") or nil);
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217 elseif required then
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218 return nil, "Required value missing";
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219 end
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220 end
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221
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222 field_readers["list-multi"] =
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223 function (field_tag, required)
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224 local result = {};
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225 for value in field_tag:childtags("value") do
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226 result[#result+1] = value:get_text();
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227 end
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228 if #result > 0 then
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229 return result;
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230 elseif required then
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231 return nil, "Required value missing";
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232 end
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233 end
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234
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235 field_readers["text-multi"] =
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236 function (field_tag, required)
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237 local data, err = field_readers["list-multi"](field_tag, required);
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238 if data then
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239 data = t_concat(data, "\n");
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240 end
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241 return data, err;
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242 end
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243
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244 field_readers["list-single"] = simple_text;
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245
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246 local boolean_values = {
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247 ["1"] = true, ["true"] = true,
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248 ["0"] = false, ["false"] = false,
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249 };
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250
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251 field_readers["boolean"] =
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252 function (field_tag, required)
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253 local raw_value, err = simple_text(field_tag, required);
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254 if not raw_value then return raw_value, err; end
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255 local value = boolean_values[raw_value];
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256 if value == nil then
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257 return nil, "Invalid boolean representation:" .. raw_value;
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258 end
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259 return value;
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260 end
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261
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262 field_readers["hidden"] =
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263 function (field_tag)
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264 return field_tag:get_child_text("value");
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265 end
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266
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267
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268 local function get_form_type(form)
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269 if not st.is_stanza(form) then
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270 return nil, "not a stanza object";
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271 elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then
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272 return nil, "not a dataform element";
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273 end
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274 for field in form:childtags("field") do
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275 if field.attr.var == "FORM_TYPE" then
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276 return field:get_child_text("value");
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277 end
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278 end
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279 return "";
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280 end
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281
6777
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282 return {
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283 new = new;
8864
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284 get_type = get_form_type;
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285 };
845
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286
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287
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288 --[=[
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289
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290 Layout:
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291 {
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292
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293 title = "MUC Configuration",
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294 instructions = [[Use this form to configure options for this MUC room.]],
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295
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296 { name = "FORM_TYPE", type = "hidden", required = true };
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297 { name = "field-name", type = "field-type", required = false };
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298 }
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299
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300
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301 --]=]