prosody
519dea077d20
util/dataforms.lua

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util/dataforms.lua @ 9091:519dea077d20

util.dataforms: Allow passing dynamically generated options as values (fixes traceback) This is awkward but there’s currently no better way to do this, short of dynamically generating the entire form each time
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 22:05:40 +0200
parent 9090:56c52cb4d44e
child 9092:5110da3a71eb
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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;
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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 not options 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
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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 --]=]