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mod_http_oauth2/mod_http_oauth2.lua @ 5187:6a3c1febd7be
mod_http_oauth2: Add settings for allowed grant and response types
So that you can opt-in to the insecure methods...
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 02 Mar 2023 23:57:29 +0100 |
parent | 5186:fa3059e653fa |
child | 5188:7c531137a553 |
rev | line source |
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1 local hashes = require "util.hashes"; |
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2 local cache = require "util.cache"; |
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3 local http = require "util.http"; |
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4 local jid = require "util.jid"; |
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5 local json = require "util.json"; |
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6 local usermanager = require "core.usermanager"; |
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7 local errors = require "util.error"; |
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8 local url = require "socket.url"; |
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9 local uuid = require "util.uuid"; |
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10 local encodings = require "util.encodings"; |
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11 local base64 = encodings.base64; |
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12 |
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13 local tokens = module:depends("tokenauth"); |
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14 |
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15 local clients = module:open_store("oauth2_clients", "map"); |
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16 |
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17 local function filter_scopes(username, host, requested_scope_string) |
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18 if host ~= module.host then |
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19 return usermanager.get_jid_role(username.."@"..host, module.host).name; |
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20 end |
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21 |
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22 if requested_scope_string then -- Specific role requested |
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23 -- TODO: The requested scope string is technically a space-delimited list |
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24 -- of scopes, but for simplicity we're mapping this slot to role names. |
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25 if usermanager.user_can_assume_role(username, module.host, requested_scope_string) then |
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26 return requested_scope_string; |
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27 end |
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28 end |
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29 |
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30 return usermanager.get_user_role(username, module.host).name; |
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31 end |
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32 |
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33 local function code_expires_in(code) |
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34 return os.difftime(os.time(), code.issued); |
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35 end |
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36 |
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37 local function code_expired(code) |
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38 return code_expires_in(code) > 120; |
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39 end |
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40 |
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41 local codes = cache.new(10000, function (_, code) |
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42 return code_expired(code) |
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43 end); |
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44 |
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45 module:add_timer(900, function() |
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46 local k, code = codes:tail(); |
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47 while code and code_expired(code) do |
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48 codes:set(k, nil); |
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49 k, code = codes:tail(); |
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50 end |
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51 return code and code_expires_in(code) + 1 or 900; |
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52 end) |
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53 |
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54 local function oauth_error(err_name, err_desc) |
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55 return errors.new({ |
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56 type = "modify"; |
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57 condition = "bad-request"; |
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58 code = err_name == "invalid_client" and 401 or 400; |
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59 text = err_desc and (err_name..": "..err_desc) or err_name; |
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60 extra = { oauth2_response = { error = err_name, error_description = err_desc } }; |
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61 }); |
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62 end |
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63 |
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64 local function new_access_token(token_jid, scope, ttl) |
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65 local token = tokens.create_jid_token(token_jid, token_jid, scope, ttl, nil, "oauth2"); |
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66 return { |
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67 token_type = "bearer"; |
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68 access_token = token; |
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69 expires_in = ttl; |
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70 scope = scope; |
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71 -- TODO: include refresh_token when implemented |
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72 }; |
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73 end |
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74 |
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75 local grant_type_handlers = {}; |
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76 local response_type_handlers = {}; |
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77 |
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78 function grant_type_handlers.password(params) |
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79 local request_jid = assert(params.username, oauth_error("invalid_request", "missing 'username' (JID)")); |
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80 local request_password = assert(params.password, oauth_error("invalid_request", "missing 'password'")); |
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81 local request_username, request_host, request_resource = jid.prepped_split(request_jid); |
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82 |
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83 if not (request_username and request_host) or request_host ~= module.host then |
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84 return oauth_error("invalid_request", "invalid JID"); |
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85 end |
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86 if not usermanager.test_password(request_username, request_host, request_password) then |
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87 return oauth_error("invalid_grant", "incorrect credentials"); |
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88 end |
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89 |
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90 local granted_jid = jid.join(request_username, request_host, request_resource); |
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91 local granted_scopes = filter_scopes(request_username, request_host, params.scope); |
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92 return json.encode(new_access_token(granted_jid, granted_scopes, nil)); |
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93 end |
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94 |
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95 -- TODO response_type_handlers have some common boilerplate code, refactor? |
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96 |
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97 function response_type_handlers.code(params, granted_jid) |
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98 if not params.client_id then return oauth_error("invalid_request", "missing 'client_id'"); end |
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99 |
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100 local client_owner, client_host, client_id = jid.prepped_split(params.client_id); |
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101 if client_host ~= module.host then |
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102 return oauth_error("invalid_client", "incorrect credentials"); |
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103 end |
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104 local client, err = clients:get(client_owner, client_id); |
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105 if err then error(err); end |
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106 if not client then |
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107 return oauth_error("invalid_client", "incorrect credentials"); |
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108 end |
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109 |
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110 local granted_scopes = filter_scopes(client_owner, client_host, params.scope); |
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111 |
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112 local code = uuid.generate(); |
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113 local ok = codes:set(params.client_id .. "#" .. code, { |
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114 issued = os.time(); |
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115 granted_jid = granted_jid; |
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116 granted_scopes = granted_scopes; |
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117 }); |
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118 if not ok then |
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119 return {status_code = 429}; |
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120 end |
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121 |
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122 local redirect = url.parse(params.redirect_uri or client.redirect_uri); |
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123 local query = http.formdecode(redirect.query or ""); |
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124 if type(query) ~= "table" then query = {}; end |
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125 table.insert(query, { name = "code", value = code }) |
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126 if params.state then |
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127 table.insert(query, { name = "state", value = params.state }); |
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128 end |
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129 redirect.query = http.formencode(query); |
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130 |
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131 return { |
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132 status_code = 302; |
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133 headers = { |
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134 location = url.build(redirect); |
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135 }; |
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136 } |
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137 end |
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138 |
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139 -- Implicit flow |
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140 function response_type_handlers.token(params, granted_jid) |
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141 if not params.client_id then return oauth_error("invalid_request", "missing 'client_id'"); end |
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142 |
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143 local client_owner, client_host, client_id = jid.prepped_split(params.client_id); |
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144 if client_host ~= module.host then |
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145 return oauth_error("invalid_client", "incorrect credentials"); |
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146 end |
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147 local client, err = clients:get(client_owner, client_id); |
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148 if err then error(err); end |
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149 if not client then |
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150 return oauth_error("invalid_client", "incorrect credentials"); |
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151 end |
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152 |
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153 local granted_scopes = filter_scopes(client_owner, client_host, params.scope); |
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154 local token_info = new_access_token(granted_jid, granted_scopes, nil); |
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155 |
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156 local redirect = url.parse(client.redirect_uri); |
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157 token_info.state = params.state; |
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158 redirect.fragment = http.formencode(token_info); |
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159 |
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160 return { |
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161 status_code = 302; |
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162 headers = { |
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163 location = url.build(redirect); |
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164 }; |
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165 } |
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|
166 end |
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|
167 |
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168 local pepper = module:get_option_string("oauth2_client_pepper", ""); |
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169 |
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170 local function verify_secret(stored, salt, i, secret) |
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171 return base64.decode(stored) == hashes.pbkdf2_hmac_sha256(secret, salt .. pepper, i); |
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172 end |
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|
173 |
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|
174 function grant_type_handlers.authorization_code(params) |
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175 if not params.client_id then return oauth_error("invalid_request", "missing 'client_id'"); end |
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176 if not params.client_secret then return oauth_error("invalid_request", "missing 'client_secret'"); end |
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177 if not params.code then return oauth_error("invalid_request", "missing 'code'"); end |
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178 if params.scope and params.scope ~= "" then |
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179 return oauth_error("invalid_scope", "unknown scope requested"); |
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180 end |
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|
181 |
4260
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|
182 local client_owner, client_host, client_id = jid.prepped_split(params.client_id); |
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|
183 if client_host ~= module.host then |
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diff
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|
184 module:log("debug", "%q ~= %q", client_host, module.host); |
4256
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185 return oauth_error("invalid_client", "incorrect credentials"); |
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|
186 end |
4260
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diff
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|
187 local client, err = clients:get(client_owner, client_id); |
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|
188 if err then error(err); end |
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189 if not client or not verify_secret(client.secret_hash, client.salt, client.iteration_count, params.client_secret) then |
4260
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|
190 module:log("debug", "client_secret mismatch"); |
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191 return oauth_error("invalid_client", "incorrect credentials"); |
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diff
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|
192 end |
4271
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diff
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|
193 local code, err = codes:get(params.client_id .. "#" .. params.code); |
4256
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194 if err then error(err); end |
4269
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|
195 if not code or type(code) ~= "table" or code_expired(code) then |
4260
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|
196 module:log("debug", "authorization_code invalid or expired: %q", code); |
4256
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197 return oauth_error("invalid_client", "incorrect credentials"); |
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198 end |
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|
199 assert(codes:set(client_id .. "#" .. params.code, nil)); |
4256
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|
200 |
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|
201 return json.encode(new_access_token(code.granted_jid, code.granted_scopes, nil)); |
4256
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|
202 end |
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|
203 |
4370
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diff
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|
204 local function check_credentials(request, allow_token) |
4256
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|
205 local auth_type, auth_data = string.match(request.headers.authorization, "^(%S+)%s(.+)$"); |
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|
206 |
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|
207 if auth_type == "Basic" then |
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208 local creds = base64.decode(auth_data); |
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|
209 if not creds then return false; end |
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|
210 local username, password = string.match(creds, "^([^:]+):(.*)$"); |
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|
211 if not username then return false; end |
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|
212 username, password = encodings.stringprep.nodeprep(username), encodings.stringprep.saslprep(password); |
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|
213 if not username then return false; end |
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|
214 if not usermanager.test_password(username, module.host, password) then |
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|
215 return false; |
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|
216 end |
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217 return username; |
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218 elseif auth_type == "Bearer" and allow_token then |
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219 local token_info = tokens.get_token_info(auth_data); |
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220 if not token_info or not token_info.session or token_info.session.host ~= module.host then |
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221 return false; |
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222 end |
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223 return token_info.session.username; |
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224 end |
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225 return nil; |
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226 end |
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227 |
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228 if module:get_host_type() == "component" then |
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229 local component_secret = assert(module:get_option_string("component_secret"), "'component_secret' is a required setting when loaded on a Component"); |
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230 |
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231 function grant_type_handlers.password(params) |
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232 local request_jid = assert(params.username, oauth_error("invalid_request", "missing 'username' (JID)")); |
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233 local request_password = assert(params.password, oauth_error("invalid_request", "missing 'password'")); |
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234 local request_username, request_host, request_resource = jid.prepped_split(request_jid); |
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235 if params.scope then |
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236 return oauth_error("invalid_scope", "unknown scope requested"); |
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237 end |
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238 if not request_host or request_host ~= module.host then |
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239 return oauth_error("invalid_request", "invalid JID"); |
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240 end |
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241 if request_password == component_secret then |
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242 local granted_jid = jid.join(request_username, request_host, request_resource); |
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243 return json.encode(new_access_token(granted_jid, nil, nil)); |
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244 end |
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245 return oauth_error("invalid_grant", "incorrect credentials"); |
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246 end |
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247 |
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248 -- TODO How would this make sense with components? |
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249 -- Have an admin authenticate maybe? |
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250 response_type_handlers.code = nil; |
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251 response_type_handlers.token = nil; |
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252 grant_type_handlers.authorization_code = nil; |
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253 check_credentials = function () return false end |
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254 end |
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255 |
5187
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256 local allowed_grant_type_handlers = module:get_option_set("allowed_oauth2_grant_types", {"authorization_code", "password"}) |
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257 for handler_type in pairs(grant_type_handlers) do |
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258 if not allowed_grant_type_handlers:contains(handler_type) then |
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259 grant_type_handlers[handler_type] = nil; |
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260 end |
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261 end |
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262 |
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263 -- "token" aka implicit flow is considered insecure |
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264 local allowed_response_type_handlers = module:get_option_set("allowed_oauth2_response_types", {"code"}) |
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265 for handler_type in pairs(allowed_response_type_handlers) do |
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266 if not allowed_grant_type_handlers:contains(handler_type) then |
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267 grant_type_handlers[handler_type] = nil; |
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268 end |
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269 end |
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270 |
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|
271 function handle_token_grant(event) |
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272 event.response.headers.content_type = "application/json"; |
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273 local params = http.formdecode(event.request.body); |
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274 if not params then |
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275 return oauth_error("invalid_request"); |
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276 end |
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277 local grant_type = params.grant_type |
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278 local grant_handler = grant_type_handlers[grant_type]; |
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279 if not grant_handler then |
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280 return oauth_error("unsupported_grant_type"); |
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281 end |
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282 return grant_handler(params); |
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283 end |
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|
284 |
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285 local function handle_authorization_request(event) |
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286 local request, response = event.request, event.response; |
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287 if not request.headers.authorization then |
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288 response.headers.www_authenticate = string.format("Basic realm=%q", module.host.."/"..module.name); |
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289 return 401; |
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290 end |
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291 local user = check_credentials(request); |
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292 if not user then |
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293 return 401; |
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294 end |
4265 | 295 -- TODO ask user for consent here |
4258
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296 if not request.url.query then |
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297 response.headers.content_type = "application/json"; |
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298 return oauth_error("invalid_request"); |
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299 end |
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300 local params = http.formdecode(request.url.query); |
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301 if not params then |
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302 return oauth_error("invalid_request"); |
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303 end |
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304 local response_type = params.response_type; |
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305 local response_handler = response_type_handlers[response_type]; |
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306 if not response_handler then |
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307 response.headers.content_type = "application/json"; |
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308 return oauth_error("unsupported_response_type"); |
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309 end |
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310 return response_handler(params, jid.join(user, module.host)); |
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311 end |
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312 |
4370
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313 local function handle_revocation_request(event) |
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314 local request, response = event.request, event.response; |
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315 if not request.headers.authorization then |
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316 response.headers.www_authenticate = string.format("Basic realm=%q", module.host.."/"..module.name); |
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317 return 401; |
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318 elseif request.headers.content_type ~= "application/x-www-form-urlencoded" |
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319 or not request.body or request.body == "" then |
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320 return 400; |
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321 end |
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322 local user = check_credentials(request, true); |
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323 if not user then |
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324 return 401; |
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325 end |
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326 |
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327 local form_data = http.formdecode(event.request.body); |
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328 if not form_data or not form_data.token then |
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329 return 400; |
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330 end |
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331 local ok, err = tokens.revoke_token(form_data.token); |
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332 if not ok then |
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333 module:log("warn", "Unable to revoke token: %s", tostring(err)); |
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334 return 500; |
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335 end |
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336 return 200; |
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337 end |
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338 |
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339 module:depends("http"); |
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340 module:provides("http", { |
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341 route = { |
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342 ["POST /token"] = handle_token_grant; |
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343 ["GET /authorize"] = handle_authorization_request; |
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344 ["POST /revoke"] = handle_revocation_request; |
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345 }; |
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346 }); |
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347 |
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348 local http_server = require "net.http.server"; |
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349 |
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350 module:hook_object_event(http_server, "http-error", function (event) |
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351 local oauth2_response = event.error and event.error.extra and event.error.extra.oauth2_response; |
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352 if not oauth2_response then |
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353 return; |
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354 end |
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355 event.response.headers.content_type = "application/json"; |
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356 event.response.status_code = event.error.code or 400; |
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357 return json.encode(oauth2_response); |
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358 end, 5); |