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policy-converter.js
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policy-converter.js
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import { mergePolicy } from 'lavamoat-core'
import {
LAVAMOAT_PKG_POLICY_ROOT,
LAVAMOAT_PKG_POLICY_VALUE_DYNAMIC,
POLICY_ITEM_DYNAMIC,
POLICY_ITEM_ROOT,
POLICY_ITEM_WILDCARD,
RSRC_POLICY_BUILTINS,
RSRC_POLICY_GLOBALS,
RSRC_POLICY_PKGS,
} from './constants.js'
import { readPolicy } from './policy.js'
const { isArray } = Array
const { entries, fromEntries } = Object
const DEFAULT_ATTENUATOR = '@lavamoat/endomoat/attenuator'
/**
* Converts LavaMoat `ResourcePolicy.builtins` to Endo's
* `PackagePolicy.builtins`
*
* @param {Record<string, boolean>} [item] - A value in `ResourcePolicy`
* @returns {import('./types.js').LavaMoatPackagePolicy['builtins']}
*/
function toEndoRsrcPkgsPolicyBuiltins(item) {
if (!item) {
return undefined
}
/**
* @type {NonNullable<
* import('./types.js').LavaMoatPackagePolicy['builtins']
* >}
*/
const policyItem = {}
for (const [key, value] of entries(item)) {
if (key.includes('.')) {
let [builtinName, ...rest] = key.split('.')
let propName = rest.join('.')
const itemForBuiltin = policyItem[builtinName]
if (typeof itemForBuiltin === 'boolean') {
throw new TypeError(
'Expected a FullAttenuationDefinition; got a boolean'
)
}
if (itemForBuiltin === 'dynamic') {
throw new TypeError(
'Expected a FullAttenuationDefinition; got "dynamic"'
)
}
if (isArray(itemForBuiltin)) {
throw new TypeError(
'Expected a FullAttenuationDefinition; got an array'
)
}
const otherParams = itemForBuiltin?.params ?? []
policyItem[builtinName] = {
attenuate: DEFAULT_ATTENUATOR,
params: [...otherParams, propName],
}
} else {
policyItem[key] = value
}
}
return policyItem
}
/**
* Converts LavaMoat `ResourcePolicy.packages` to Endo's
* `PackagePolicy.packages`
*
* @param {import('lavamoat-core').PackagePolicy} [item] - A value in
* `ResourcePolicy`
* @returns {import('./types.js').LavaMoatPackagePolicy['packages']}
*/
function toEndoRsrcPkgsPolicyPkgs(item) {
if (!item) {
return undefined
}
/**
* @type {NonNullable<
* import('./types.js').LavaMoatPackagePolicy['packages']
* >}
*/
const policyItem = {}
for (const [key, value] of entries(item)) {
if (key === LAVAMOAT_PKG_POLICY_ROOT) {
throw new TypeError('Unexpected root package policy')
} else {
policyItem[key] =
value === LAVAMOAT_PKG_POLICY_VALUE_DYNAMIC
? POLICY_ITEM_DYNAMIC
: Boolean(value)
}
}
return policyItem
}
/**
* Converts LavaMoat `ResourcePolicy.globals` to Endo's `PackagePolicy.globals`
*
* @param {import('lavamoat-core').GlobalPolicy} [item] - A value in
* `ResourcePolicy`
* @returns {import('./types.js').LavaMoatPackagePolicy['globals']}
*/
function toEndoRsrcPkgsPolicyGlobals(item) {
if (!item) {
return undefined
}
return fromEntries(
entries(item).map(([key, value]) => {
switch (typeof value) {
case 'boolean':
return [key, value]
case 'string':
if (value === 'read') {
return [key, true]
}
// XXX: this is "write", which is currently unsupported
return [key, true]
default:
throw new TypeError(`Unexpected global policy value: ${value}`)
}
})
)
}
/**
* Converters LavaMoat `ResourcePolicy` to Endo's `PackagePolicy`
*
* @param {import('lavamoat-core').ResourcePolicy} resources
* @returns {import('./types.js').LavaMoatPackagePolicy}
*/
function toEndoRsrcPkgsPolicy(resources) {
/** @type {import('./types.js').LavaMoatPackagePolicy} */
const pkgPolicy = {
[RSRC_POLICY_PKGS]: toEndoRsrcPkgsPolicyPkgs(resources.packages),
[RSRC_POLICY_GLOBALS]: toEndoRsrcPkgsPolicyGlobals(resources.globals),
[RSRC_POLICY_BUILTINS]: toEndoRsrcPkgsPolicyBuiltins(resources.builtin),
}
return pkgPolicy
}
/**
* Converts a LavaMoat policy to an Endo policy
*
* @param {import('lavamoat-core').LavaMoatPolicy} lmPolicy
* @returns {Promise<import('./types.js').LavaMoatEndoPolicy>}
*/
export async function toEndoPolicy(lmPolicy) {
// policy for self; needed for attenuator
const overrides = await readPolicy(
new URL('./policy-override.json', import.meta.url)
)
const finalLMPolicy = mergePolicy(lmPolicy, overrides)
/** @type {import('./types.js').LavaMoatEndoPolicy} */
const endoPolicy = {
defaultAttenuator: DEFAULT_ATTENUATOR,
entry: {
[RSRC_POLICY_GLOBALS]: [POLICY_ITEM_ROOT],
[RSRC_POLICY_PKGS]: POLICY_ITEM_WILDCARD,
[RSRC_POLICY_BUILTINS]: POLICY_ITEM_WILDCARD,
noGlobalFreeze: true,
},
resources: fromEntries(
entries(finalLMPolicy.resources ?? {}).map(([rsrcName, rsrcPolicy]) => [
rsrcName,
toEndoRsrcPkgsPolicy(rsrcPolicy),
])
),
}
return endoPolicy
}