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freakyfeltfreakyfelt
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feat!: rewrite to simpler interface
BREAKING CHANGE: the 2.x interface drops environments and resource types
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‎README.md‎

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@@ -5,17 +5,15 @@ could-could is yet another authorization library built atop [JsonLogic](https://
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## Features
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- Generates the set of policies ahead of time for predictable performance
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- Allows for defining policies across `environments` (e.g. `development`, `production-use1`, etc) as well as `actions` (e.g. `create`, `kitty:PetKitty`, etc) on a given resource type. Policies will be merged with an `or` so any one matching policy is sufficient
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- Provides for both `allow` and `deny` constraints. `deny` constraints will always take precedence
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- Allows for a context to be provided when evaluating the policy, allowing for more complex conditional logic
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- Uses a portable [JSONSchema](./schemas/resource-policy-2022-04.schema.json) for validating the shape of the policies
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- Uses a portable [JSONSchema](./schemas/resource-policy-2023-02.schema.json) for validating the shape of the policies
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- Can extend JsonLogic with custom functions if needed (not recommended as you will need to implement the same functions in each consumer of the policy)
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## Terms
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- `resourceType`: an identifier for a type of resource to validate (e.g. `BlogPost`, `com.kitties.Kitty`)
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- `environment`: an arbitrary identifier for an operating context, allowing for different constraints in `test`, non-production (e.g. `alpha`, `preview`), or different regions of `production` (e.g. `production-use1`)
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- `action`: an identifier of what kind of action is being requested (e.g. `create`, `kittes:PetKitty`). Actions can be specified as a single action, an array of actions, or `*` which will match any action.
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- `action`: an identifier of what kind of action(s) are being requested (e.g. `create`, `kitties:PetKitty`)
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- Actions can be specified as a single action, an array of actions, or `*` which will match any action.
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- `effect`: what the result should be if the `constraint` is true
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- `constraint`: the rules that will be evaluated to determine if an action can occur
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- `context`: the extra data that can be provided to make decisions, such as a principal (e.g. user/service object) or the resource in question
@@ -24,72 +22,54 @@ could-could is yet another authorization library built atop [JsonLogic](https://
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You will need a few pieces of information up front when creating a collection of policies:
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1. a resource type naming convention
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1. a list of actions that are permitted for each resource type. All other actions will evaluate to `false`
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1. what environments you plan to use across all resource types, such as `development`, `test`, `beta`, `production`
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- TIP: use a namespacing scheme such as `documents:deleteDocument` to group actions by domain
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1. what information will be available in the context when evaluating an action
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```jsonc
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// example policy stored somewhere that can be consumed at runtime
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{
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"resourceType": "Kitty",
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"actions": ["create", "read", "update", "pet"],
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"definitions": [
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"actions": ["kitty:create", "kitty:read", "kitty:update", "kitty:pet"],
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"policies": [
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{
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"environment": "*", // applies across all environments
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"policies": [
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{
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"description": "Allow everyone to create a kitty",
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"action": "create", // specify a single action
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"effect": "allow",
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"constraint": true
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},
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{
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"description": "Allow admins to take any action",
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"action": "*",
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"effect": "allow",
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"constraint": {
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// expects that context will include a subject object with a role property
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"===": [
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{ "var": "subject.role" },
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"admin"
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]
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}
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},
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{
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"description": "allow owners to read, update and pet the kitty",
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"action": ["read", "update", "pet"], // specify a list of actions
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"effect": "allow",
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"constraint": {
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"===": [
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{ "var": "subject.id" },
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{ "var": "kitty.ownerId" }
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]
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}
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}
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{
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"description": "Do not allow users (even admins!) to pet if the kitty is sleeping or eating",
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"action": "pet",
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"effect": "deny", // will override any allow statement
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"constraint": {
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"in": [
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{ "var": "kitty.state" },
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["eating", "sleeping"]
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]
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}
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}
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]
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"description": "Allow everyone to create a kitty",
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"action": "kitty:create", // specify a single action
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"effect": "allow",
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"constraint": true
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},
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{
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"environment": ["development", "alpha", "beta"], // specify a list of environments
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"policies": [
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{
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"description": "allow developers to update any kitty in non-prod environments",
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"action": "update",
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"effect": "allow",
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"constraint": true
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}
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]
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"description": "Allow admins to take any action",
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"action": "*",
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"effect": "allow",
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"constraint": {
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// expects that context will include a subject object with a role property
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"===": [
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{ "var": "subject.role" },
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"admin"
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]
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}
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},
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{
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"description": "allow owners to read, update and pet the kitty",
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"action": ["kitty:read", "kitty:update", "kitty:pet"], // specify a list of actions
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"effect": "allow",
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"constraint": {
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"===": [
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{ "var": "subject.id" },
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{ "var": "kitty.ownerId" }
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]
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}
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}
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{
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"description": "Do not allow users (even admins!) to pet if the kitty is sleeping or eating",
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"action": "kitty:pet",
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"effect": "deny", // will override any allow statement
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"constraint": {
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"in": [
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{ "var": "kitty.state" },
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["eating", "sleeping"]
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]
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}
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}
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]
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}
@@ -100,11 +80,11 @@ Next, in the consuming application create a resolver and make it available for u
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```ts
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import { createPolicyResolver } from '@freakyfelt/could-could'
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const resolver = createPolicyResolver({ policies, targetEnvironment: process.env.NODE_ENV })
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const resolver = createPolicyResolver({ policies })
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// ...then at runtime
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function petKitty(kitty: Kitty, { subject }: RequestContext) {
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if (!resolver.can({ action: 'pet', resourceType: 'Kitty' }, { kitty, subject })) {
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if (!resolver.can({ action: 'kitty:pet' }, { kitty, subject })) {
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throw new NotAuthorizedError()
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}
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}
@@ -122,4 +102,4 @@ The package is broken into three major areas: the validator, the parser, and the
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* the validator checks that the provided resource policy matches the schema, has listed all potential actions defined in the constraints, and has an evaluatable set of constraints
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* the parser does the heavy lifting of turning a resource policy into a compiled Map of action => JsonLogic
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* the resolver accepts a policyStore and handles the runtime evaluation logic based on the provided action, resource type, and context
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* the resolver accepts a policyStore and handles the runtime evaluation logic based on the provided action and context

‎examples/Kitty.jsonc‎

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}
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*/
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{
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"$schema": "../schemas/resource-policy-2022-04.schema.json",
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"$schema": "../schemas/resource-policy-2023-02.schema.json",
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"resourceType": "Kitty",
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"actions": ["create", "read", "update", "pet"],
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"definitions": [
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"policies": [
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{
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"environment": "*", // applies across all environments
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"policies": [
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{
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"description": "Allow everyone to create a kitty",
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"action": "create", // specify a single action
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"effect": "allow",
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"constraint": true
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},
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{
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"description": "Allow admins to take any action",
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"action": "*",
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"effect": "allow",
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"constraint": {
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// expects that context will include a subject object with a role property
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"===": [
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{ "var": "subject.role" },
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"admin"
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]
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}
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},
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{
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"description": "allow owners to read, update and pet the kitty",
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"action": ["read", "update", "pet"], // specify a list of actions
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"effect": "allow",
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"constraint": {
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"===": [
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{ "var": "subject.id" },
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{ "var": "kitty.ownerId" }
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]
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}
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},
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{
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"description": "Do not allow users (even admins!) to pet if the kitty is sleeping or eating",
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"action": "pet",
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"effect": "deny", // will override any allow statement
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"constraint": {
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"in": [
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{ "var": "kitty.state" },
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["eating", "sleeping"]
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]
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}
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}
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]
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"description": "Allow everyone to create a kitty",
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"action": "create", // specify a single action
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"effect": "allow",
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"constraint": true
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},
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{
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"environment": ["development", "alpha", "beta"], // specify a list of environments
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"policies": [
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{
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"description": "allow developers to update any kitty in non-prod environments",
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"action": "update",
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"effect": "allow",
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"constraint": true
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}
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]
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"description": "Allow admins to take any action",
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"action": "*",
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"effect": "allow",
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"constraint": {
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// expects that context will include a subject object with a role property
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"===": [
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{ "var": "subject.role" },
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"admin"
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]
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}
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},
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{
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"description": "allow owners to read, update and pet the kitty",
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"action": ["read", "update", "pet"], // specify a list of actions
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"effect": "allow",
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"constraint": {
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"===": [
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{ "var": "subject.id" },
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{ "var": "kitty.ownerId" }
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]
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}
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},
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{
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"description": "Do not allow users (even admins!) to pet if the kitty is sleeping or eating",
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"action": "pet",
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"effect": "deny", // will override any allow statement
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"constraint": {
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"in": [
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{ "var": "kitty.state" },
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["eating", "sleeping"]
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]
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}
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}
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]
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}

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