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annotate mod_aws_profile/mod_aws_profile.lua @ 4480:dad0367d33e8

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mod_rest: Revert leftover of unfinished ?query mapping Idea was to allow second level data fields to be passed as query parameters, i.e. /rest/command/{to}/?command=execute&node=foobar but that's still a work in progress, so reverted here for now.
author Kim Alvefur <zash@zash.se>
date Sun, 28 Feb 2021 20:59:53 +0100
parents 1d719d4ef18f
children 616c0459aca7
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1d719d4ef18f mod_aws_profile: New module for role-based access to AWS APIs
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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