@aws-cdk/aws-iam/lib/util.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.sum = exports.UniqueStringSet = exports.mergePrincipal = exports.AttachedPolicies = exports.generatePolicyName = exports.undefinedIfEmpty = exports.LITERAL_STRING_KEY = void 0;
const core_1 = require("@aws-cdk/core");
const MAX_POLICY_NAME_LEN = 128;
exports.LITERAL_STRING_KEY = 'LiteralString';
function undefinedIfEmpty(f) {
    return core_1.Lazy.list({
        produce: () => {
            const array = f();
            return (array && array.length > 0) ? array : undefined;
        },
    });
}
exports.undefinedIfEmpty = undefinedIfEmpty;
/**
 * Used to generate a unique policy name based on the policy resource construct.
 * The logical ID of the resource is a great candidate as long as it doesn't exceed
 * 128 characters, so we take the last 128 characters (in order to make sure the hash
 * is there).
 */
function generatePolicyName(scope, logicalId) {
    // as logicalId is itself a Token, resolve it first
    const resolvedLogicalId = core_1.Tokenization.resolve(logicalId, {
        scope,
        resolver: new core_1.DefaultTokenResolver(new core_1.StringConcat()),
    });
    return lastNCharacters(resolvedLogicalId, MAX_POLICY_NAME_LEN);
}
exports.generatePolicyName = generatePolicyName;
/**
 * Returns a string composed of the last n characters of str.
 * If str is shorter than n, returns str.
 *
 * @param str the string to return the last n characters of
 * @param n how many characters to return
 */
function lastNCharacters(str, n) {
    const startIndex = Math.max(str.length - n, 0);
    return str.substring(startIndex, str.length);
}
/**
 * Helper class that maintains the set of attached policies for a principal.
 */
class AttachedPolicies {
    constructor() {
        this.policies = new Array();
    }
    /**
     * Adds a policy to the list of attached policies.
     *
     * If this policy is already, attached, returns false.
     * If there is another policy attached with the same name, throws an exception.
     */
    attach(policy) {
        if (this.policies.find(p => p === policy)) {
            return; // already attached
        }
        if (this.policies.find(p => p.policyName === policy.policyName)) {
            throw new Error(`A policy named "${policy.policyName}" is already attached`);
        }
        this.policies.push(policy);
    }
}
exports.AttachedPolicies = AttachedPolicies;
/**
 * Merge two dictionaries that represent IAM principals
 *
 * Does an in-place merge.
 */
function mergePrincipal(target, source) {
    // If one represents a literal string, the other one must be empty
    const sourceKeys = Object.keys(source);
    const targetKeys = Object.keys(target);
    if ((exports.LITERAL_STRING_KEY in source && targetKeys.some(k => k !== exports.LITERAL_STRING_KEY)) ||
        (exports.LITERAL_STRING_KEY in target && sourceKeys.some(k => k !== exports.LITERAL_STRING_KEY))) {
        throw new Error(`Cannot merge principals ${JSON.stringify(target)} and ${JSON.stringify(source)}; if one uses a literal principal string the other one must be empty`);
    }
    for (const key of sourceKeys) {
        target[key] = target[key] ?? [];
        let value = source[key];
        if (!Array.isArray(value)) {
            value = [value];
        }
        target[key].push(...value);
    }
    return target;
}
exports.mergePrincipal = mergePrincipal;
/**
 * Lazy string set token that dedupes entries
 *
 * Needs to operate post-resolve, because the inputs could be
 * `[ '${Token[TOKEN.9]}', '${Token[TOKEN.10]}', '${Token[TOKEN.20]}' ]`, which
 * still all resolve to the same string value.
 *
 * Needs to JSON.stringify() results because strings could resolve to literal
 * strings but could also resolve to `{ Fn::Join: [...] }`.
 */
class UniqueStringSet {
    constructor(fn) {
        this.fn = fn;
        this.creationStack = core_1.captureStackTrace();
    }
    static from(fn) {
        return core_1.Token.asList(new UniqueStringSet(fn));
    }
    resolve(context) {
        context.registerPostProcessor(this);
        return this.fn();
    }
    postProcess(input, _context) {
        if (!Array.isArray(input)) {
            return input;
        }
        if (input.length === 0) {
            return undefined;
        }
        const uniq = {};
        for (const el of input) {
            uniq[JSON.stringify(el)] = el;
        }
        return Object.values(uniq);
    }
    toString() {
        return core_1.Token.asString(this);
    }
}
exports.UniqueStringSet = UniqueStringSet;
function sum(xs) {
    return xs.reduce((a, b) => a + b, 0);
}
exports.sum = sum;
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array : undefined;\n    },\n  });\n}\n\n/**\n * Used to generate a unique policy name based on the policy resource construct.\n * The logical ID of the resource is a great candidate as long as it doesn't exceed\n * 128 characters, so we take the last 128 characters (in order to make sure the hash\n * is there).\n */\nexport function generatePolicyName(scope: IConstruct, logicalId: string): string {\n  // as logicalId is itself a Token, resolve it first\n  const resolvedLogicalId = Tokenization.resolve(logicalId, {\n    scope,\n    resolver: new DefaultTokenResolver(new StringConcat()),\n  });\n  return lastNCharacters(resolvedLogicalId, MAX_POLICY_NAME_LEN);\n}\n\n/**\n * Returns a string composed of the last n characters of str.\n * If str is shorter than n, returns str.\n *\n * @param str the string to return the last n characters of\n * @param n how many characters to return\n */\nfunction lastNCharacters(str: string, n: number) {\n  const startIndex = Math.max(str.length - n, 0);\n  return str.substring(startIndex, str.length);\n}\n\n/**\n * Helper class that maintains the set of attached policies for a principal.\n */\nexport class AttachedPolicies {\n  private policies = new Array<IPolicy>();\n\n  /**\n   * Adds a policy to the list of attached policies.\n   *\n   * If this policy is already, attached, returns false.\n   * If there is another policy attached with the same name, throws an exception.\n   */\n  public attach(policy: IPolicy) {\n    if (this.policies.find(p => p === policy)) {\n      return; // already attached\n    }\n\n    if (this.policies.find(p => p.policyName === policy.policyName)) {\n      throw new Error(`A policy named \"${policy.policyName}\" is already attached`);\n    }\n\n    this.policies.push(policy);\n  }\n}\n\n/**\n * Merge two dictionaries that represent IAM principals\n *\n * Does an in-place merge.\n */\nexport function mergePrincipal(target: { [key: string]: string[] }, source: { [key: string]: string[] }) {\n  // If one represents a literal string, the other one must be empty\n  const sourceKeys = Object.keys(source);\n  const targetKeys = Object.keys(target);\n\n  if ((LITERAL_STRING_KEY in source && targetKeys.some(k => k !== LITERAL_STRING_KEY)) ||\n    (LITERAL_STRING_KEY in target && sourceKeys.some(k => k !== LITERAL_STRING_KEY))) {\n    throw new Error(`Cannot merge principals ${JSON.stringify(target)} and ${JSON.stringify(source)}; if one uses a literal principal string the other one must be empty`);\n  }\n\n  for (const key of sourceKeys) {\n    target[key] = target[key] ?? [];\n\n    let value = source[key];\n    if (!Array.isArray(value)) {\n      value = [value];\n    }\n\n    target[key].push(...value);\n  }\n\n  return target;\n}\n\n/**\n * Lazy string set token that dedupes entries\n *\n * Needs to operate post-resolve, because the inputs could be\n * `[ '${Token[TOKEN.9]}', '${Token[TOKEN.10]}', '${Token[TOKEN.20]}' ]`, which\n * still all resolve to the same string value.\n *\n * Needs to JSON.stringify() results because strings could resolve to literal\n * strings but could also resolve to `{ Fn::Join: [...] }`.\n */\nexport class UniqueStringSet implements IResolvable, IPostProcessor {\n  public static from(fn: () => string[]) {\n    return Token.asList(new UniqueStringSet(fn));\n  }\n\n  public readonly creationStack: string[];\n\n  private constructor(private readonly fn: () => string[]) {\n    this.creationStack = captureStackTrace();\n  }\n\n  public resolve(context: IResolveContext) {\n    context.registerPostProcessor(this);\n    return this.fn();\n  }\n\n  public postProcess(input: any, _context: IResolveContext) {\n    if (!Array.isArray(input)) { return input; }\n    if (input.length === 0) { return undefined; }\n\n    const uniq: Record<string, any> = {};\n    for (const el of input) {\n      uniq[JSON.stringify(el)] = el;\n    }\n    return Object.values(uniq);\n  }\n\n  public toString(): string {\n    return Token.asString(this);\n  }\n}\n\nexport function sum(xs: number[]) {\n  return xs.reduce((a, b) => a + b, 0);\n}\n"]}