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annotate mod_auth_oauth_external/mod_auth_oauth_external.lua @ 5344:0a6d2b79a8bf

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mod_auth_oauth_external: Authenticate against an OAuth 2 provider But suddenly unsure whether this constitutes an OAuth "client" or something else? Resource server maybe?
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 12:45:22 +0100
parents
children 3390bb2f9f6c
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5344
0a6d2b79a8bf mod_auth_oauth_external: Authenticate against an OAuth 2 provider
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1 local http = require "net.http";
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2 local async = require "util.async";
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3 local json = require "util.json";
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4 local sasl = require "util.sasl";
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5
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6 -- TODO -- local issuer_identity = module:get_option_string("oauth_external_issuer");
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7 local oidc_discovery_url = module:get_option_string("oauth_external_discovery_url")
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8 local validation_endpoint = module:get_option_string("oauth_external_validation_endpoint");
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9
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10 local username_field = module:get_option_string("oauth_external_username_field", "preferred_username");
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11
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12 -- XXX Hold up, does whatever done here even need any of these things? Are we
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13 -- the OAuth client? Is the XMPP client the OAuth client? What are we???
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14 -- TODO -- local client_id = module:get_option_string("oauth_external_client_id");
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15 -- TODO -- local client_secret = module:get_option_string("oauth_external_client_secret");
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16
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17 --[[ More or less required endpoints
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18 digraph "oauth endpoints" {
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19 issuer -> discovery -> { registration validation }
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20 registration -> { client_id client_secret }
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21 { client_id client_secret validation } -> required
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22 }
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23 --]]
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24
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25 local host = module.host;
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26 local provider = {};
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27
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28 function provider.get_sasl_handler()
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29 local profile = {};
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30 profile.http_client = http.default; -- TODO configurable
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31 local extra = { oidc_discovery_url = oidc_discovery_url };
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32 function profile:oauthbearer(token)
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33 if token == "" then
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34 return false, nil, extra;
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35 end
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36
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37 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint,
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38 { headers = { ["Authorization"] = "Bearer " .. token; ["Accept"] = "application/json" } }));
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39 if err then
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40 return false, nil, extra;
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41 end
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42 local response = ret and json.decode(ret.body);
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43 if not (ret.code >= 200 and ret.code < 300) then
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44 return false, nil, response or extra;
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45 end
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46 if type(response) ~= "table" or type(response[username_field]) ~= "string" then
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47 return false, nil, nil;
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48 end
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49
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50 return response[username_field], true, response;
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51 end
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52 return sasl.new(host, profile);
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53 end
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54
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55 module:provides("auth", provider);