prosody-modules
b62f5e38f865
mod_register_json/mod_register_json.lua

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mod_register_json/mod_register_json.lua @ 560:b62f5e38f865

mod_register_json: added auto-cleanup logic to the module so it can at least be unloaded and reloaded without fuss. (Experimental: works with server_select and trunk)
author Marco Cirillo <maranda@lightwitch.org>
date Tue, 17 Jan 2012 00:57:47 +0000
parent 553:7310ceb7564f
child 561:f2ec7149b005
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1 -- Expose a simple servlet to handle user registrations from web pages
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2 -- via JSON.
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3 --
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4 -- A Good chunk of the code is from mod_data_access.lua by Kim Alvefur
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5 -- aka Zash.
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6
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7 local jid_prep = require "util.jid".prep
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8 local jid_split = require "util.jid".split
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9 local usermanager = require "core.usermanager"
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10 local b64_decode = require "util.encodings".base64.decode
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11 local json_decode = require "util.json".decode
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12 local httpserver = require "net.httpserver"
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13 local os_time = os.time
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14 local nodeprep = require "util.encodings".stringprep.nodeprep
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15
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16 module.host = "*" -- HTTP/BOSH Servlets need to be global.
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17
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18 -- Pick up configuration.
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19
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20 local set_realm_name = module:get_option_string("reg_servlet_realm", "Restricted")
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21 local throttle_time = module:get_option_number("reg_servlet_ttime", nil)
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22 local whitelist = module:get_option_set("reg_servlet_wl", {})
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23 local blacklist = module:get_option_set("reg_servlet_bl", {})
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24 local ports = module:get_option_array("reg_servlet_ports", {{ port = 9280 }})
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25 local recent_ips = {}
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26
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27 -- Begin
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28
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29 local function http_response(code, message, extra_headers)
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30 local response = {
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31 status = code .. " " .. message,
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32 body = message .. "\n" }
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33 if extra_headers then response.headers = extra_headers end
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34 return response
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35 end
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36
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37 local function handle_req(method, body, request)
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38 if request.method ~= "POST" then
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39 return http_response(405, "Bad method...", {["Allow"] = "POST"})
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40 end
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41 if not request.headers["authorization"] then
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42 return http_response(401, "No... No...", {["WWW-Authenticate"]='Basic realm="'.. set_realm_name ..'"'})
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43 end
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44
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45 local user, password = b64_decode(request.headers.authorization:match("[^ ]*$") or ""):match("([^:]*):(.*)")
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46 user = jid_prep(user)
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47 if not user or not password then return http_response(400, "What's this..?") end
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48 local user_node, user_host = jid_split(user)
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49 if not hosts[user_host] then return http_response(401, "Negative.") end
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50
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51 module:log("warn", "%s is authing to submit a new user registration data", user)
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52 if not usermanager.test_password(user_node, user_host, password) then
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53 module:log("warn", "%s failed authentication", user)
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54 return http_response(401, "Who the hell are you?! Guards!")
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55 end
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56
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57 local req_body
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58 -- We check that what we have is valid JSON wise else we throw an error...
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59 if not pcall(function() req_body = json_decode(body) end) then
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60 module:log("debug", "JSON data submitted for user registration by %s failed to Decode.", user)
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61 return http_response(400, "JSON Decoding failed.")
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62 else
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63 -- Decode JSON data and check that all bits are there else throw an error
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64 req_body = json_decode(body)
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65 if req_body["username"] == nil or req_body["password"] == nil or req_body["host"] == nil or req_body["ip"] == nil then
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66 module:log("debug", "%s supplied an insufficent number of elements or wrong elements for the JSON registration", user)
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67 return http_response(400, "Invalid syntax.")
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68 end
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69 -- Check if user is an admin of said host
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70 if not usermanager.is_admin(user, req_body["host"]) then
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71 module:log("warn", "%s tried to submit registration data for %s but he's not an admin", user, req_body["host"])
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72 return http_response(401, "I obey only to my masters... Have a nice day.")
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73 else
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74 -- Checks for both Throttling/Whitelist and Blacklist (basically copycatted from prosody's register.lua code)
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75 if blacklist:contains(req_body["ip"]) then module:log("warn", "Attempt of reg. submission to the JSON servlet from blacklisted address: %s", req_body["ip"]) ; return http_response(403, "The specified address is blacklisted, sorry sorry.") end
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76 if throttle_time and not whitelist:contains(req_body["ip"]) then
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77 if not recent_ips[req_body["ip"]] then
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78 recent_ips[req_body["ip"]] = { time = os_time(), count = 1 }
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79 else
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80 local ip = recent_ips[req_body["ip"]]
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81 ip.count = ip.count + 1
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82
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83 if os_time() - ip.time < throttle_time then
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84 ip.time = os_time()
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85 module:log("warn", "JSON Registration request from %s has been throttled.", req_body["ip"])
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86 return http_response(503, "Woah... How many users you want to register..? Request throttled, wait a bit and try again.")
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87 end
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88 ip.time = os_time()
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89 end
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90 end
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91
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92 -- We first check if the supplied username for registration is already there.
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93 -- And nodeprep the username
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94 local username = nodeprep(req_body["username"])
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95 if not usermanager.user_exists(username, req_body["host"]) then
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96 if not username then
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97 module:log("debug", "%s supplied an username containing invalid characters: %s", user, username)
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98 return http_response(406, "Supplied username contains invalid characters, see RFC 6122.")
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99 else
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100 local ok, error = usermanager.create_user(username, req_body["password"], req_body["host"])
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101 if ok then
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102 hosts[req_body["host"]].events.fire_event("user-registered", { username = username, host = req_body["host"], source = "mod_register_json", session = { ip = req_body["ip"] } })
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103 module:log("debug", "%s registration data submission for %s@%s is successful", user, username, req_body["host"])
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104 return http_response(200, "Done.")
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105 else
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106 module:log("error", "user creation failed: "..error)
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107 return http_response(500, "Encountered server error while creating the user: "..error)
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108 end
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109 end
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110 else
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111 module:log("debug", "%s registration data submission for %s failed (user already exists)", user, username)
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112 return http_response(409, "User already exists.")
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113 end
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114 end
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115 end
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116 end
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117
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118 -- Set it up!
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119 function cleanup() -- it could be better if module:hook("module-unloaded", ...) actually worked.
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120 module:log("debug", "Cleaning up handlers and stuff as module is being unloaded.")
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121 for _, options in ipairs(ports) do
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122 if options.port then
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123 httpserver.new.http_servers[options.port].handlers[options.path or "register_account"] = nil
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124 end
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125 end
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126
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127 -- if there're no handlers left clean the socket, not sure if it works with server_select
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128 for _, options in ipairs(ports) do
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129 if options.port and not next(httpserver.new.http_servers[options.port].handlers) then
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130 httpserver.new.http_servers[options.port] = nil
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131 if options.interface then
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132 for _, value in ipairs(options.interface) do
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133 if server.getserver(value, options.port) then server.removeserver(value, options.port) end
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134 end
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135 else if server.getserver("*", options.port) then server.removeserver("*", options.port) end end
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136 end
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137 end
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138
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139 prosody.events.remove_handler("module-unloaded", cleanup)
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140 end
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141
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142 function setup()
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143 for id, options in ipairs(ports) do
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144 if not options.port then
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145 if not options.ssl then ports[id].port = 9280
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146 else ports[id].port = 9443 end
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147 elseif options.port == 9280 and options.ssl then ports[id].port = 9443 end end
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148 httpserver.new_from_config(ports, handle_req, { base = "register_account" })
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149 prosody.events.add_handler("module-unloaded", cleanup)
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150 end
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151
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152 if prosody.start_time then -- already started
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153 setup()
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154 else
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155 module:hook("server-started", setup)
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156 end