prosody
a661292d074a
util/roles.lua

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util/roles.lua @ 12647:a661292d074a

util.roles: Add new utility module to consolidate role objects and methods
author Matthew Wild <mwild1@gmail.com>
date Tue, 19 Jul 2022 17:44:26 +0100
child 12746:7eabf8d78978
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12647
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1 local array = require "util.array";
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2 local it = require "util.iterators";
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3 local new_short_id = require "util.id".short;
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4
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5 local role_methods = {};
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6 local role_mt = {
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7 __index = role_methods;
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8 __name = "role";
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9 __add = nil;
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10 };
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11
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12 local function is_role(o)
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13 local mt = getmetatable(o);
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14 return mt == role_mt;
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15 end
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16
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17 local function _new_may(permissions, inherited_mays)
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18 local n_inherited = inherited_mays and #inherited_mays;
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19 return function (role, action, context)
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20 -- Note: 'role' may be a descendent role, not only the one we're attached to
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21 local policy = permissions[action];
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22 if policy ~= nil then
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23 return policy;
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24 end
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25 if n_inherited then
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26 for i = 1, n_inherited do
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27 policy = inherited_mays[i](role, action, context);
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28 if policy ~= nil then
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29 return policy;
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30 end
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31 end
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32 end
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33 return false;
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34 end
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35 end
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36
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37 local permissions_key = {};
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38
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39 -- {
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40 -- Required:
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41 -- name = "My fancy role";
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42 --
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43 -- Optional:
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44 -- inherits = { role_obj... }
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45 -- default = true
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46 -- priority = 100
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47 -- permissions = {
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48 -- ["foo"] = true; -- allow
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49 -- ["bar"] = false; -- deny
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50 -- }
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51 -- }
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52 local function new(base_config, overrides)
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53 local config = setmetatable(overrides or {}, { __index = base_config });
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54 local permissions = {};
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55 local inherited_mays;
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56 if config.inherits then
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57 inherited_mays = array.pluck(config.inherits, "may");
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58 end
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59 local new_role = {
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60 id = new_short_id();
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61 name = config.name;
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62 description = config.description;
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63 default = config.default;
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64 priority = config.priority;
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65 may = _new_may(permissions, inherited_mays);
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66 inherits = config.inherits;
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67 [permissions_key] = permissions;
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68 };
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69 local desired_permissions = config.permissions or config[permissions_key];
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70 for k, v in pairs(desired_permissions or {}) do
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71 permissions[k] = v;
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72 end
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73 return setmetatable(new_role, role_mt);
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74 end
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75
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76 function role_methods:clone(overrides)
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77 return new(self, overrides);
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78 end
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79
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80 function role_methods:set_permission(permission_name, policy, overwrite)
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81 local permissions = self[permissions_key];
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82 if overwrite ~= true and permissions[permission_name] ~= nil and permissions[permission_name] ~= policy then
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83 return false, "policy-already-exists";
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84 end
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85 permissions[permission_name] = policy;
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86 return true;
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87 end
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88
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89 function role_mt.__tostring(self)
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90 return ("role<[%s] %s>"):format(self.id or "nil", self.name or "[no name]");
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91 end
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92
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93 function role_mt.__pairs(self)
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94 return it.filter(permissions_key, next, self);
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95 end
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96
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97 return {
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98 is_role = is_role;
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99 new = new;
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100 };