prosody
3a7a0b9f42f3
util/dataforms.lua

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util/dataforms.lua @ 9089:3a7a0b9f42f3

util.dataforms: Skip all fields for the 'cancel' form type XEP-0004 says: > a data form of type "cancel" SHOULD NOT contain any <field/> elements. The title and instructions don't seem to be of much value in this case either. I'm not aware of 'cancel' being used anywhere, so this should break nothing. Early return is always nice.
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 21:06:59 +0200
parent 9088:aa1b02411846
child 9090:56c52cb4d44e
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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 layout.title then
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35 form:tag("title"):text(layout.title):up();
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36 end
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37 if layout.instructions then
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38 form:tag("instructions"):text(layout.instructions):up();
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39 end
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40 for _, field in ipairs(layout) do
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41 local field_type = field.type or "text-single";
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42 -- Add field tag
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43 form:tag("field", { type = field_type, var = field.name, label = field.label });
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44
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45 if field.desc then
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46 form:text_tag("desc", field.desc);
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47 end
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48
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49 local value;
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50 if data and data[field.name] ~= nil then
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51 value = data[field.name];
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52 else
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53 value = field.value;
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54 end
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55
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56 if formtype == "form" and field.options then
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57 local defaults = {};
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58 for _, val in ipairs(field.options) do
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59 if type(val) == "table" then
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60 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();
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61 if val.default then
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62 defaults[#defaults+1] = val.value;
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63 end
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64 else
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65 form:tag("option", { label= val }):tag("value"):text(val):up():up();
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66 end
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67 end
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68 if not value then
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69 if field_type == "list-single" then
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70 value = defaults[1];
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71 elseif field_type == "list-multi" then
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72 value = defaults;
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73 end
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74 end
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75 end
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76
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77 if value ~= nil then
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78 -- Add value, depending on type
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79 if field_type == "hidden" then
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80 if type(value) == "table" then
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81 -- Assume an XML snippet
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82 form:tag("value")
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83 :add_child(value)
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84 :up();
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85 else
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86 form:tag("value"):text(value):up();
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87 end
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88 elseif field_type == "boolean" then
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89 form:tag("value"):text((value and "1") or "0"):up();
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90 elseif field_type == "fixed" then
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91 form:tag("value"):text(value):up();
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92 elseif field_type == "jid-multi" then
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93 for _, jid in ipairs(value) do
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94 form:tag("value"):text(jid):up();
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95 end
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96 elseif field_type == "jid-single" then
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97 form:tag("value"):text(value):up();
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98 elseif field_type == "text-single" or field_type == "text-private" then
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99 form:tag("value"):text(value):up();
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100 elseif field_type == "text-multi" then
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101 -- Split into multiple <value> tags, one for each line
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102 for line in value:gmatch("([^\r\n]+)\r?\n*") do
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103 form:tag("value"):text(line):up();
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104 end
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105 elseif field_type == "list-single" then
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106 form:tag("value"):text(value):up();
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107 elseif field_type == "list-multi" then
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108 for _, val in ipairs(value) do
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109 form:tag("value"):text(val):up();
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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 elseif field.name then
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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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parents:
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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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diff changeset
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
955
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222 end
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diff changeset
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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diff changeset
231 end
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232
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233 field_readers["list-single"] = simple_text;
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diff changeset
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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diff changeset
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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diff changeset
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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diff changeset
256
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diff changeset
257 local function get_form_type(form)
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diff changeset
258 if not st.is_stanza(form) then
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diff changeset
259 return nil, "not a stanza object";
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diff changeset
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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diff changeset
262 end
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diff changeset
263 for field in form:childtags("field") do
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diff changeset
264 if field.attr.var == "FORM_TYPE" then
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diff changeset
265 return field:get_child_text("value");
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diff changeset
266 end
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diff changeset
267 end
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diff changeset
268 return "";
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diff changeset
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
951
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290 --]=]