Mercurial > prosody-modules

annotate mod_register_web/mod_register_web.lua @ 1230:f7c561fbd5a6

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mod_register_web: Friendly error messages if the username is taken or failed nodeprep
author Kim Alvefur <zash@zash.se>
date Sat, 30 Nov 2013 20:28:07 +0100
parents 12e3bc0fd6ed
children 502ce9672eae
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c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
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1 local captcha_options = module:get_option("captcha_options", {});
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03595194075a mod_register_web: nodeprep username before creating user (thanks IRON)
Matthew Wild <mwild1@gmail.com>
parents: 653
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2 local nodeprep = require "util.encodings".stringprep.nodeprep;
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a3766d3baacb mod_register_web: Import usermanager and util.http into locals
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3 local usermanager = require "core.usermanager";
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4 local http = require "util.http";
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5
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6 function template(data)
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7 -- Like util.template, but deals with plain text
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8 return { apply = function(values) return (data:gsub("{([^}]+)}", values)); end }
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9 end
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10
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11 local function get_template(name)
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12 local fh = assert(module:load_resource("templates/"..name..".html"));
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13 local data = assert(fh:read("*a"));
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14 fh:close();
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15 return template(data);
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16 end
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17
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18 local function render(template, data)
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19 return tostring(template.apply(data));
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20 end
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21
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22 local register_tpl = get_template "register";
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23 local success_tpl = get_template "success";
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24
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25 if next(captcha_options) ~= nil then
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26 local recaptcha_tpl = get_template "recaptcha";
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28 function generate_captcha(display_options)
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29 return recaptcha_tpl.apply(setmetatable({
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30 recaptcha_display_error = display_options and display_options.recaptcha_error
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31 and ("&error="..display_options.recaptcha_error) or "";
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32 }, {
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33 __index = function (t, k)
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34 if captcha_options[k] then return captcha_options[k]; end
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35 module:log("error", "Missing parameter from captcha_options: %s", k);
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36 end
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37 }));
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38 end
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39 function verify_captcha(form, callback)
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40 http.request("https://www.google.com/recaptcha/api/verify", {
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41 body = http.formencode {
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42 privatekey = captcha_options.recaptcha_private_key;
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43 remoteip = request.conn:ip();
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44 challenge = form.recaptcha_challenge_field;
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45 response = form.recaptcha_response_field;
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46 };
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47 }, function (verify_result, code)
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48 local verify_ok, verify_err = verify_result:match("^([^\n]+)\n([^\n]+)");
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49 if verify_ok == "true" then
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50 callback(true);
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51 else
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52 callback(false, verify_err)
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53 end
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54 end);
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55 end
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56 else
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57 module:log("debug", "No Recaptcha options set, using fallback captcha")
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58 local hmac_sha1 = require "util.hashes".hmac_sha1;
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59 local secret = require "util.uuid".generate()
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60 local ops = { '+', '-' };
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61 local captcha_tpl = get_template "simplecaptcha";
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62 function generate_captcha()
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63 local op = ops[math.random(1, #ops)];
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64 local x, y = math.random(1, 9)
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65 repeat
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66 y = math.random(1, 9);
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67 until x ~= y;
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68 local answer;
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69 if op == '+' then
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70 answer = x + y;
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71 elseif op == '-' then
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72 if x < y then
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73 -- Avoid negative numbers
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74 x, y = y, x;
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75 end
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76 answer = x - y;
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77 end
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78 local challenge = hmac_sha1(secret, answer, true);
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79 return captcha_tpl.apply {
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80 op = op, x = x, y = y, challenge = challenge;
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81 };
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82 end
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83 function verify_captcha(form, callback)
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84 if hmac_sha1(secret, form.captcha_reply, true) == form.captcha_challenge then
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85 callback(true);
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86 else
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87 callback(false, "Captcha verification failed");
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88 end
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89 end
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90 end
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91
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92 function generate_page(event, display_options)
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93 local request = event.request;
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94
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95 return render(register_tpl, {
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96 path = request.path; hostname = module.host;
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97 notice = display_options and display_options.register_error or "";
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98 captcha = generate_captcha(display_options);
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99 })
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100 end
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101
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102 function register_user(form)
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103 local prepped_username = nodeprep(form.username);
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104 if not prepped_username then
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105 return nil, "Username contains forbidden characters";
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106 end
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107 if usermanager.user_exists(prepped_username, module.host) then
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108 return nil, "Username already taken";
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109 end
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110 return usermanager.create_user(prepped_username, form.password, module.host);
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111 end
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112
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113 function generate_success(event, form)
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114 return render(success_tpl, { jid = nodeprep(form.username).."@"..module.host });
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115 end
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116
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117 function generate_register_response(event, form, ok, err)
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118 local message;
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119 if ok then
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120 return generate_success(event, form);
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121 else
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122 return generate_page(event, { register_error = err });
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123 end
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124 end
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125
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126 function handle_form(event)
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127 local request, response = event.request, event.response;
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128 local form = http.formdecode(request.body);
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129 verify_captcha(form, function (ok, err)
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130 if ok then
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131 local register_ok, register_err = register_user(form);
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132 response:send(generate_register_response(event, form, register_ok, register_err));
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133 else
1226
0667624637da mod_register_web: Split out recaptcha verification to a separate function
Kim Alvefur <zash@zash.se>
parents: 1225
diff changeset
134 response:send(generate_page(event, { register_error = err }));
653
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
135 end
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
136 end);
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
137 return true; -- Leave connection open until we respond above
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138 end
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
139
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 module:provides("http", {
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141 route = {
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
142 GET = generate_page;
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
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143 POST = handle_form;
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
144 };
c08b0e4b7b38 mod_register_web: Extremely rough web registration page, with captcha
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
145 });