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annotate mod_aws_profile/mod_aws_profile.lua @ 5149:fa56ed2bacab

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mod_unified_push: Add support for multiple token backends, including stoage Now that we have ACLs by default, it is no longer necessary to be completely stateless. On 0.12, using storage has benefits over JWT, because it does not expose client JIDs to the push apps/services. In trunk, PASETO is stateless and does not expose client JIDs.
author Matthew Wild <mwild1@gmail.com>
date Sat, 14 Jan 2023 14:31:37 +0000
parents 1d719d4ef18f
children 616c0459aca7
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1 local http = require "net.http";
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2 local json = require "util.json";
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3 local parse_timestamp = require "util.datetime".parse;
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4
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5 module:set_global();
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6
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7 local current_credentials = module:shared("/*/aws_profile/credentials");
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8
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9 local function get_role_credentials(role_name, cb)
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10 http.request("http://169.254.169.254/latest/meta-data/iam/security-credentials/"..role_name, nil, function (credentials_json)
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11 local credentials = credentials_json and json.decode(credentials_json);
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12 if not credentials or not (credentials.AccessKeyId and credentials.SecretAccessKey) then
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13 module:log("warn", "Failed to fetch credentials for %q", role_name);
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14 cb(nil);
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15 return;
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16 end
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17 local expiry = parse_timestamp(credentials.Expiration);
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18 local ttl = os.difftime(expiry, os.time());
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19 cb({
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20 access_key = credentials.AccessKeyId;
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21 secret_key = credentials.SecretAccessKey;
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22 ttl = ttl;
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23 expiry = expiry;
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24 });
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25 end);
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26 end
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27
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28 local function get_credentials(cb)
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29 http.request("http://169.254.169.254/latest/meta-data/iam/security-credentials", nil, function (role_name)
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30 role_name = role_name and role_name:match("%S+");
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31 if not role_name then
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32 module:log("warn", "Unable to discover role name");
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33 cb(nil);
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34 return;
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35 end
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36 get_role_credentials(role_name, cb);
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37 end);
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38 end
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39
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40 function refresh_credentials(force)
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41 if not force and current_credentials.expiry and current_credentials.expiry - os.time() > 300 then
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42 return;
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43 end
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44 get_credentials(function (credentials)
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45 if not credentials then
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46 module:log("warn", "Failed to refresh credentials!");
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47 return;
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48 end
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49 current_credentials.access_key = credentials.access_key;
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50 current_credentials.secret_key = credentials.secret_key;
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51 current_credentials.expiry = credentials.expiry;
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52 module:timer(credentials.ttl or 240, refresh_credentials);
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53 module:fire_event("aws_profile/credentials-refreshed", current_credentials);
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54 end);
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55 end
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56
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57 function module.load()
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58 refresh_credentials(true);
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59 end