@aws-cdk/cloudformation-diff
Version:
Utilities to diff CDK stacks against CloudFormation templates
270 lines • 31.7 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Effect = exports.Targets = exports.Statement = void 0;
exports.parseStatements = parseStatements;
exports.parseLambdaPermission = parseLambdaPermission;
exports.renderCondition = renderCondition;
const maybe_parsed_1 = require("../diff/maybe-parsed");
const util_1 = require("../util");
// namespace object imports won't work in the bundle for function exports
// eslint-disable-next-line @typescript-eslint/no-require-imports
const deepEqual = require('fast-deep-equal');
class Statement {
constructor(statement) {
if (typeof statement === 'string') {
this.sid = undefined;
this.effect = Effect.Unknown;
this.resources = new Targets({}, '', '');
this.actions = new Targets({}, '', '');
this.principals = new Targets({}, '', '');
this.condition = undefined;
this.serializedIntrinsic = statement;
}
else {
this.sid = expectString(statement.Sid);
this.effect = expectEffect(statement.Effect);
this.resources = new Targets(statement, 'Resource', 'NotResource');
this.actions = new Targets(statement, 'Action', 'NotAction');
this.principals = new Targets(statement, 'Principal', 'NotPrincipal');
this.condition = statement.Condition;
this.serializedIntrinsic = undefined;
}
}
/**
* Whether this statement is equal to the other statement
*/
equal(other) {
return (this.sid === other.sid
&& this.effect === other.effect
&& this.serializedIntrinsic === other.serializedIntrinsic
&& this.resources.equal(other.resources)
&& this.actions.equal(other.actions)
&& this.principals.equal(other.principals)
&& deepEqual(this.condition, other.condition));
}
render() {
return this.serializedIntrinsic
? {
resource: this.serializedIntrinsic,
effect: '',
action: '',
principal: this.principals.render(), // these will be replaced by the call to replaceEmpty() from IamChanges
condition: '',
}
: {
resource: this.resources.render(),
effect: this.effect,
action: this.actions.render(),
principal: this.principals.render(),
condition: renderCondition(this.condition),
};
}
/**
* Return a machine-readable version of the changes.
* This is only used in tests.
*
* @internal
*/
_toJson() {
return this.serializedIntrinsic
? (0, maybe_parsed_1.mkUnparseable)(this.serializedIntrinsic)
: (0, maybe_parsed_1.mkParsed)((0, util_1.deepRemoveUndefined)({
sid: this.sid,
effect: this.effect,
resources: this.resources._toJson(),
principals: this.principals._toJson(),
actions: this.actions._toJson(),
condition: this.condition,
}));
}
/**
* Whether this is a negative statement
*
* A statement is negative if any of its targets are negative, inverted
* if the Effect is Deny.
*/
get isNegativeStatement() {
const notTarget = this.actions.not || this.principals.not || this.resources.not;
return this.effect === Effect.Allow ? notTarget : !notTarget;
}
}
exports.Statement = Statement;
/**
* Parse a list of statements from undefined, a Statement, or a list of statements
*/
function parseStatements(x) {
if (x === undefined) {
x = [];
}
if (!Array.isArray(x)) {
x = [x];
}
return x.map((s) => new Statement(s));
}
/**
* Parse a Statement from a Lambda::Permission object
*
* This is actually what Lambda adds to the policy document if you call AddPermission.
*/
function parseLambdaPermission(x) {
// Construct a statement from
const statement = {
Effect: 'Allow',
Action: x.Action,
Resource: x.FunctionName,
};
if (x.Principal !== undefined) {
if (x.Principal === '*') {
// *
statement.Principal = '*';
}
else if (/^\d{12}$/.test(x.Principal)) {
// Account number
// eslint-disable-next-line @cdklabs/no-literal-partition
statement.Principal = { AWS: `arn:aws:iam::${x.Principal}:root` };
}
else {
// Assume it's a service principal
// We might get this wrong vs. the previous one for tokens. Nothing to be done
// about that. It's only for human readable consumption after all.
statement.Principal = { Service: x.Principal };
}
}
if (x.SourceArn !== undefined) {
if (statement.Condition === undefined) {
statement.Condition = {};
}
statement.Condition.ArnLike = { 'AWS:SourceArn': x.SourceArn };
}
if (x.SourceAccount !== undefined) {
if (statement.Condition === undefined) {
statement.Condition = {};
}
statement.Condition.StringEquals = { 'AWS:SourceAccount': x.SourceAccount };
}
if (x.EventSourceToken !== undefined) {
if (statement.Condition === undefined) {
statement.Condition = {};
}
statement.Condition.StringEquals = { 'lambda:EventSourceToken': x.EventSourceToken };
}
return new Statement(statement);
}
/**
* Targets for a field
*/
class Targets {
constructor(statement, positiveKey, negativeKey) {
if (negativeKey in statement) {
this.values = forceListOfStrings(statement[negativeKey]);
this.not = true;
}
else {
this.values = forceListOfStrings(statement[positiveKey]);
this.not = false;
}
this.values.sort();
}
get empty() {
return this.values.length === 0;
}
/**
* Whether this set of targets is equal to the other set of targets
*/
equal(other) {
return this.not === other.not && deepEqual(this.values.sort(), other.values.sort());
}
/**
* If the current value set is empty, put this in it
*/
replaceEmpty(replacement) {
if (this.empty) {
this.values.push(replacement);
}
}
/**
* If the actions contains a '*', replace with this string.
*/
replaceStar(replacement) {
for (let i = 0; i < this.values.length; i++) {
if (this.values[i] === '*') {
this.values[i] = replacement;
}
}
this.values.sort();
}
/**
* Render into a summary table cell
*/
render() {
return this.not
? this.values.map(s => `NOT ${s}`).join('\n')
: this.values.join('\n');
}
/**
* Return a machine-readable version of the changes.
* This is only used in tests.
*
* @internal
*/
_toJson() {
return { not: this.not, values: this.values };
}
}
exports.Targets = Targets;
var Effect;
(function (Effect) {
Effect["Unknown"] = "Unknown";
Effect["Allow"] = "Allow";
Effect["Deny"] = "Deny";
})(Effect || (exports.Effect = Effect = {}));
function expectString(x) {
return typeof x === 'string' ? x : undefined;
}
function expectEffect(x) {
if (x === Effect.Allow || x === Effect.Deny) {
return x;
}
return Effect.Unknown;
}
function forceListOfStrings(x) {
if (typeof x === 'string') {
return [x];
}
if (typeof x === 'undefined' || x === null) {
return [];
}
if (Array.isArray(x)) {
return x.map(e => forceListOfStrings(e).join(','));
}
if (typeof x === 'object' && x !== null) {
const ret = [];
for (const [key, value] of Object.entries(x)) {
ret.push(...forceListOfStrings(value).map(s => `${key}:${s}`));
}
return ret;
}
return [`${x}`];
}
/**
* Render the Condition column
*/
function renderCondition(condition) {
if (!condition || Object.keys(condition).length === 0) {
return '';
}
const jsonRepresentation = JSON.stringify(condition, undefined, 2);
// The JSON representation looks like this:
//
// {
// "ArnLike": {
// "AWS:SourceArn": "${MyTopic86869434}"
// }
// }
//
// We can make it more compact without losing information by getting rid of the outermost braces
// and the indentation.
const lines = jsonRepresentation.split('\n');
return lines.slice(1, lines.length - 1).map(s => s.slice(2)).join('\n');
}
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type { MaybeParsed } from '../diff/maybe-parsed';\nimport { mkParsed, mkUnparseable } from '../diff/maybe-parsed';\nimport { deepRemoveUndefined } from '../util';\n\n// namespace object imports won't work in the bundle for function exports\n// eslint-disable-next-line @typescript-eslint/no-require-imports\nconst deepEqual = require('fast-deep-equal');\n\nexport class Statement {\n  /**\n   * Statement ID\n   */\n  public readonly sid: string | undefined;\n\n  /**\n   * Statement effect\n   */\n  public readonly effect: Effect;\n\n  /**\n   * Resources\n   */\n  public readonly resources: Targets;\n\n  /**\n   * Principals\n   */\n  public readonly principals: Targets;\n\n  /**\n   * Actions\n   */\n  public readonly actions: Targets;\n\n  /**\n   * Object with conditions\n   */\n  public readonly condition?: any;\n\n  private readonly serializedIntrinsic: string | undefined;\n\n  constructor(statement: UnknownMap | string) {\n    if (typeof statement === 'string') {\n      this.sid = undefined;\n      this.effect = Effect.Unknown;\n      this.resources = new Targets({}, '', '');\n      this.actions = new Targets({}, '', '');\n      this.principals = new Targets({}, '', '');\n      this.condition = undefined;\n      this.serializedIntrinsic = statement;\n    } else {\n      this.sid = expectString(statement.Sid);\n      this.effect = expectEffect(statement.Effect);\n      this.resources = new Targets(statement, 'Resource', 'NotResource');\n      this.actions = new Targets(statement, 'Action', 'NotAction');\n      this.principals = new Targets(statement, 'Principal', 'NotPrincipal');\n      this.condition = statement.Condition;\n      this.serializedIntrinsic = undefined;\n    }\n  }\n\n  /**\n   * Whether this statement is equal to the other statement\n   */\n  public equal(other: Statement): boolean {\n    return (this.sid === other.sid\n      && this.effect === other.effect\n      && this.serializedIntrinsic === other.serializedIntrinsic\n      && this.resources.equal(other.resources)\n      && this.actions.equal(other.actions)\n      && this.principals.equal(other.principals)\n      && deepEqual(this.condition, other.condition));\n  }\n\n  public render(): RenderedStatement {\n    return this.serializedIntrinsic\n      ? {\n        resource: this.serializedIntrinsic,\n        effect: '',\n        action: '',\n        principal: this.principals.render(), // these will be replaced by the call to replaceEmpty() from IamChanges\n        condition: '',\n      }\n      : {\n        resource: this.resources.render(),\n        effect: this.effect,\n        action: this.actions.render(),\n        principal: this.principals.render(),\n        condition: renderCondition(this.condition),\n      };\n  }\n\n  /**\n   * Return a machine-readable version of the changes.\n   * This is only used in tests.\n   *\n   * @internal\n   */\n  public _toJson(): MaybeParsed<StatementJson> {\n    return this.serializedIntrinsic\n      ? mkUnparseable(this.serializedIntrinsic)\n      : mkParsed(deepRemoveUndefined({\n        sid: this.sid,\n        effect: this.effect,\n        resources: this.resources._toJson(),\n        principals: this.principals._toJson(),\n        actions: this.actions._toJson(),\n        condition: this.condition,\n      }));\n  }\n\n  /**\n   * Whether this is a negative statement\n   *\n   * A statement is negative if any of its targets are negative, inverted\n   * if the Effect is Deny.\n   */\n  public get isNegativeStatement(): boolean {\n    const notTarget = this.actions.not || this.principals.not || this.resources.not;\n    return this.effect === Effect.Allow ? notTarget : !notTarget;\n  }\n}\n\nexport interface RenderedStatement {\n  readonly resource: string;\n  readonly effect: string;\n  readonly action: string;\n  readonly principal: string;\n  readonly condition: string;\n}\n\nexport interface StatementJson {\n  sid?: string;\n  effect: string;\n  resources: TargetsJson;\n  actions: TargetsJson;\n  principals: TargetsJson;\n  condition?: any;\n}\n\nexport interface TargetsJson {\n  not: boolean;\n  values: string[];\n}\n\n/**\n * Parse a list of statements from undefined, a Statement, or a list of statements\n */\nexport function parseStatements(x: any): Statement[] {\n  if (x === undefined) {\n    x = [];\n  }\n  if (!Array.isArray(x)) {\n    x = [x];\n  }\n  return x.map((s: any) => new Statement(s));\n}\n\n/**\n * Parse a Statement from a Lambda::Permission object\n *\n * This is actually what Lambda adds to the policy document if you call AddPermission.\n */\nexport function parseLambdaPermission(x: any): Statement {\n  // Construct a statement from\n  const statement: any = {\n    Effect: 'Allow',\n    Action: x.Action,\n    Resource: x.FunctionName,\n  };\n\n  if (x.Principal !== undefined) {\n    if (x.Principal === '*') {\n      // *\n      statement.Principal = '*';\n    } else if (/^\\d{12}$/.test(x.Principal)) {\n      // Account number\n      // eslint-disable-next-line @cdklabs/no-literal-partition\n      statement.Principal = { AWS: `arn:aws:iam::${x.Principal}:root` };\n    } else {\n      // Assume it's a service principal\n      // We might get this wrong vs. the previous one for tokens. Nothing to be done\n      // about that. It's only for human readable consumption after all.\n      statement.Principal = { Service: x.Principal };\n    }\n  }\n  if (x.SourceArn !== undefined) {\n    if (statement.Condition === undefined) {\n      statement.Condition = {};\n    }\n    statement.Condition.ArnLike = { 'AWS:SourceArn': x.SourceArn };\n  }\n  if (x.SourceAccount !== undefined) {\n    if (statement.Condition === undefined) {\n      statement.Condition = {};\n    }\n    statement.Condition.StringEquals = { 'AWS:SourceAccount': x.SourceAccount };\n  }\n  if (x.EventSourceToken !== undefined) {\n    if (statement.Condition === undefined) {\n      statement.Condition = {};\n    }\n    statement.Condition.StringEquals = { 'lambda:EventSourceToken': x.EventSourceToken };\n  }\n\n  return new Statement(statement);\n}\n\n/**\n * Targets for a field\n */\nexport class Targets {\n  /**\n   * The values of the targets\n   */\n  public readonly values: string[];\n\n  /**\n   * Whether positive or negative matchers\n   */\n  public readonly not: boolean;\n\n  constructor(statement: UnknownMap, positiveKey: string, negativeKey: string) {\n    if (negativeKey in statement) {\n      this.values = forceListOfStrings(statement[negativeKey]);\n      this.not = true;\n    } else {\n      this.values = forceListOfStrings(statement[positiveKey]);\n      this.not = false;\n    }\n    this.values.sort();\n  }\n\n  public get empty() {\n    return this.values.length === 0;\n  }\n\n  /**\n   * Whether this set of targets is equal to the other set of targets\n   */\n  public equal(other: Targets) {\n    return this.not === other.not && deepEqual(this.values.sort(), other.values.sort());\n  }\n\n  /**\n   * If the current value set is empty, put this in it\n   */\n  public replaceEmpty(replacement: string) {\n    if (this.empty) {\n      this.values.push(replacement);\n    }\n  }\n\n  /**\n   * If the actions contains a '*', replace with this string.\n   */\n  public replaceStar(replacement: string) {\n    for (let i = 0; i < this.values.length; i++) {\n      if (this.values[i] === '*') {\n        this.values[i] = replacement;\n      }\n    }\n    this.values.sort();\n  }\n\n  /**\n   * Render into a summary table cell\n   */\n  public render(): string {\n    return this.not\n      ? this.values.map(s => `NOT ${s}`).join('\\n')\n      : this.values.join('\\n');\n  }\n\n  /**\n   * Return a machine-readable version of the changes.\n   * This is only used in tests.\n   *\n   * @internal\n   */\n  public _toJson(): TargetsJson {\n    return { not: this.not, values: this.values };\n  }\n}\n\ntype UnknownMap = { [key: string]: unknown };\n\nexport enum Effect {\n  Unknown = 'Unknown',\n  Allow = 'Allow',\n  Deny = 'Deny',\n}\n\nfunction expectString(x: unknown): string | undefined {\n  return typeof x === 'string' ? x : undefined;\n}\n\nfunction expectEffect(x: unknown): Effect {\n  if (x === Effect.Allow || x === Effect.Deny) {\n    return x as Effect;\n  }\n  return Effect.Unknown;\n}\n\nfunction forceListOfStrings(x: unknown): string[] {\n  if (typeof x === 'string') {\n    return [x];\n  }\n  if (typeof x === 'undefined' || x === null) {\n    return [];\n  }\n\n  if (Array.isArray(x)) {\n    return x.map(e => forceListOfStrings(e).join(','));\n  }\n\n  if (typeof x === 'object' && x !== null) {\n    const ret: string[] = [];\n    for (const [key, value] of Object.entries(x)) {\n      ret.push(...forceListOfStrings(value).map(s => `${key}:${s}`));\n    }\n    return ret;\n  }\n\n  return [`${x}`];\n}\n\n/**\n * Render the Condition column\n */\nexport function renderCondition(condition: any): string {\n  if (!condition || Object.keys(condition).length === 0) {\n    return '';\n  }\n  const jsonRepresentation = JSON.stringify(condition, undefined, 2);\n\n  // The JSON representation looks like this:\n  //\n  //  {\n  //    \"ArnLike\": {\n  //      \"AWS:SourceArn\": \"${MyTopic86869434}\"\n  //    }\n  //  }\n  //\n  // We can make it more compact without losing information by getting rid of the outermost braces\n  // and the indentation.\n  const lines = jsonRepresentation.split('\\n');\n  return lines.slice(1, lines.length - 1).map(s => s.slice(2)).join('\\n');\n}\n"]}