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util/dataforms.lua @ 9084:572b6858db03
util.dataforms: Detach generation of options from values (fixes #1177)
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 03 Aug 2018 18:35:00 +0200 |
parent | 9047:ab3488ee3ca5 |
child | 9087:9e45e7adcebf |
rev | line source |
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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
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5 -- This project is MIT/X11 licensed. Please see the |
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6 -- COPYING file in the source package for more information. |
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7 -- |
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8 |
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9 local setmetatable = setmetatable; |
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10 local ipairs = ipairs; |
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11 local type, next = type, next; |
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12 local t_concat = table.concat; |
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13 local st = require "util.stanza"; |
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14 local jid_prep = require "util.jid".prep; |
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15 |
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16 local _ENV = nil; |
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17 -- luacheck: std none |
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18 |
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19 local xmlns_forms = 'jabber:x:data'; |
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20 |
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21 local form_t = {}; |
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22 local form_mt = { __index = form_t }; |
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23 |
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24 local function new(layout) |
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25 return setmetatable(layout, form_mt); |
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26 end |
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27 |
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28 function form_t.form(layout, data, formtype) |
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29 local form = st.stanza("x", { xmlns = xmlns_forms, type = formtype or "form" }); |
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30 if layout.title then |
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31 form:tag("title"):text(layout.title):up(); |
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32 end |
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33 if layout.instructions then |
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34 form:tag("instructions"):text(layout.instructions):up(); |
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35 end |
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36 for _, field in ipairs(layout) do |
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37 local field_type = field.type or "text-single"; |
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38 -- Add field tag |
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39 form:tag("field", { type = field_type, var = field.name, label = field.label }); |
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40 |
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41 if field.desc then |
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42 form:text_tag("desc", field.desc); |
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43 end |
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44 |
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45 local value; |
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46 if data and data[field.name] ~= nil then |
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47 value = data[field.name]; |
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48 else |
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49 value = field.value; |
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50 end |
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51 |
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52 if formtype ~= "result" and field.options then |
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53 local defaults = {}; |
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54 for _, val in ipairs(field.options) do |
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55 if type(val) == "table" then |
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56 form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up(); |
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57 if val.default then |
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58 defaults[#defaults+1] = val.value; |
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59 end |
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60 else |
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61 form:tag("option", { label= val }):tag("value"):text(val):up():up(); |
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62 end |
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63 end |
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64 if not value then |
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65 if field_type == "list-single" then |
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66 value = defaults[1]; |
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67 elseif field_type == "list-multi" then |
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68 value = defaults; |
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69 end |
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70 end |
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71 end |
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72 |
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73 if value ~= nil then |
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74 -- Add value, depending on type |
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75 if field_type == "hidden" then |
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76 if type(value) == "table" then |
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77 -- Assume an XML snippet |
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78 form:tag("value") |
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79 :add_child(value) |
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80 :up(); |
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81 else |
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82 form:tag("value"):text(value):up(); |
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83 end |
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84 elseif field_type == "boolean" then |
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85 form:tag("value"):text((value and "1") or "0"):up(); |
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86 elseif field_type == "fixed" then |
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87 form:tag("value"):text(value):up(); |
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88 elseif field_type == "jid-multi" then |
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89 for _, jid in ipairs(value) do |
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90 form:tag("value"):text(jid):up(); |
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91 end |
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92 elseif field_type == "jid-single" then |
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93 form:tag("value"):text(value):up(); |
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94 elseif field_type == "text-single" or field_type == "text-private" then |
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95 form:tag("value"):text(value):up(); |
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96 elseif field_type == "text-multi" then |
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97 -- Split into multiple <value> tags, one for each line |
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98 for line in value:gmatch("([^\r\n]+)\r?\n*") do |
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99 form:tag("value"):text(line):up(); |
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100 end |
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101 elseif field_type == "list-single" then |
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102 form:tag("value"):text(value):up(); |
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103 elseif field_type == "list-multi" then |
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104 for _, val in ipairs(value) do |
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105 form:tag("value"):text(val):up(); |
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106 end |
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107 end |
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108 end |
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109 |
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110 local media = field.media; |
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111 if media then |
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112 form:tag("media", { xmlns = "urn:xmpp:media-element", height = media.height, width = media.width }); |
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113 for _, val in ipairs(media) do |
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114 form:tag("uri", { type = val.type }):text(val.uri):up() |
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115 end |
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116 form:up(); |
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117 end |
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119 if field.required then |
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120 form:tag("required"):up(); |
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121 end |
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122 |
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123 -- Jump back up to list of fields |
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124 form:up(); |
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125 end |
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126 return form; |
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127 end |
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128 |
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129 local field_readers = {}; |
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130 |
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131 function form_t.data(layout, stanza) |
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132 local data = {}; |
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133 local errors = {}; |
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134 local present = {}; |
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135 |
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136 for _, field in ipairs(layout) do |
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137 local tag; |
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138 for field_tag in stanza:childtags("field") do |
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139 if field.name == field_tag.attr.var then |
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140 tag = field_tag; |
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141 break; |
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142 end |
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143 end |
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144 |
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145 if not tag then |
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146 if field.required then |
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147 errors[field.name] = "Required value missing"; |
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148 end |
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149 elseif field.name then |
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150 present[field.name] = true; |
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151 local reader = field_readers[field.type]; |
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152 if reader then |
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153 data[field.name], errors[field.name] = reader(tag, field.required); |
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154 end |
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155 end |
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156 end |
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157 if next(errors) then |
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158 return data, errors, present; |
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159 end |
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160 return data, nil, present; |
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161 end |
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162 |
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163 local function simple_text(field_tag, required) |
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164 local data = field_tag:get_child_text("value"); |
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165 -- XEP-0004 does not say if an empty string is acceptable for a required value |
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166 -- so we will follow HTML5 which says that empty string means missing |
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167 if required and (data == nil or data == "") then |
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168 return nil, "Required value missing"; |
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169 end |
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170 return data; -- Return whatever get_child_text returned, even if empty string |
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171 end |
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172 |
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173 field_readers["text-single"] = simple_text; |
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174 |
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175 field_readers["text-private"] = simple_text; |
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176 |
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177 field_readers["jid-single"] = |
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178 function (field_tag, required) |
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179 local raw_data, err = simple_text(field_tag, required); |
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180 if not raw_data then return raw_data, err; end |
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181 local data = jid_prep(raw_data); |
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182 if not data then |
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183 return nil, "Invalid JID: " .. raw_data; |
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184 end |
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185 return data; |
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186 end |
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187 |
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188 field_readers["jid-multi"] = |
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189 function (field_tag, required) |
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190 local result = {}; |
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191 local err = {}; |
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192 for value_tag in field_tag:childtags("value") do |
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193 local raw_value = value_tag:get_text(); |
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194 local value = jid_prep(raw_value); |
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195 result[#result+1] = value; |
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196 if raw_value and not value then |
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197 err[#err+1] = ("Invalid JID: " .. raw_value); |
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198 end |
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199 end |
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200 if #result > 0 then |
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201 return result, (#err > 0 and t_concat(err, "\n") or nil); |
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202 elseif required then |
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203 return nil, "Required value missing"; |
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204 end |
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205 end |
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206 |
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207 field_readers["list-multi"] = |
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208 function (field_tag, required) |
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209 local result = {}; |
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210 for value in field_tag:childtags("value") do |
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211 result[#result+1] = value:get_text(); |
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212 end |
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213 if #result > 0 then |
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214 return result; |
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215 elseif required then |
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216 return nil, "Required value missing"; |
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217 end |
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218 end |
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219 |
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220 field_readers["text-multi"] = |
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221 function (field_tag, required) |
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222 local data, err = field_readers["list-multi"](field_tag, required); |
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223 if data then |
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224 data = t_concat(data, "\n"); |
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225 end |
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226 return data, err; |
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227 end |
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228 |
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229 field_readers["list-single"] = simple_text; |
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230 |
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231 local boolean_values = { |
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232 ["1"] = true, ["true"] = true, |
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233 ["0"] = false, ["false"] = false, |
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234 }; |
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235 |
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236 field_readers["boolean"] = |
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237 function (field_tag, required) |
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238 local raw_value, err = simple_text(field_tag, required); |
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239 if not raw_value then return raw_value, err; end |
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240 local value = boolean_values[raw_value]; |
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241 if value == nil then |
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242 return nil, "Invalid boolean representation:" .. raw_value; |
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243 end |
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244 return value; |
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245 end |
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246 |
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247 field_readers["hidden"] = |
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248 function (field_tag) |
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249 return field_tag:get_child_text("value"); |
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250 end |
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251 |
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252 |
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253 local function get_form_type(form) |
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254 if not st.is_stanza(form) then |
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255 return nil, "not a stanza object"; |
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256 elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then |
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257 return nil, "not a dataform element"; |
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258 end |
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259 for field in form:childtags("field") do |
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260 if field.attr.var == "FORM_TYPE" then |
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261 return field:get_child_text("value"); |
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262 end |
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263 end |
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264 return ""; |
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265 end |
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266 |
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267 return { |
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268 new = new; |
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269 get_type = get_form_type; |
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270 }; |
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271 |
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272 |
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273 --[=[ |
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274 |
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275 Layout: |
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276 { |
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277 |
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278 title = "MUC Configuration", |
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279 instructions = [[Use this form to configure options for this MUC room.]], |
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280 |
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281 { name = "FORM_TYPE", type = "hidden", required = true }; |
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282 { name = "field-name", type = "field-type", required = false }; |
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283 } |
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284 |
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285 |
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286 --]=] |