├── .gitignore ├── .jshintrc ├── index.d.ts ├── .github └── workflows │ └── ci.yml ├── NOTICE ├── cli.js ├── package.json ├── README.md ├── test └── test-main.js ├── index.js └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | /node_modules/ 2 | -------------------------------------------------------------------------------- /.jshintrc: -------------------------------------------------------------------------------- 1 | { 2 | "undef": true, 3 | "unused": "vars", 4 | "globalstrict": true, 5 | "node": true, 6 | "esnext": true 7 | } 8 | -------------------------------------------------------------------------------- /index.d.ts: -------------------------------------------------------------------------------- 1 | // Type definitions for yaml-cfn. 2 | 3 | import {Schema} from "js-yaml"; 4 | 5 | export const schema: Schema; 6 | 7 | export function yamlParse(str: string): any; 8 | export function yamlDump(obj: any): string; 9 | -------------------------------------------------------------------------------- /.github/workflows/ci.yml: -------------------------------------------------------------------------------- 1 | name: CI 2 | 3 | on: 4 | push: 5 | 6 | jobs: 7 | test: 8 | runs-on: ubuntu-latest 9 | strategy: 10 | matrix: 11 | node-version: [12, 14] 12 | steps: 13 | - uses: actions/checkout@v2 14 | - uses: actions/setup-node@v2 15 | with: 16 | node-version: ${{ matrix.node-version }} 17 | - run: npm install 18 | - run: npm test 19 | -------------------------------------------------------------------------------- /NOTICE: -------------------------------------------------------------------------------- 1 | Copyright 2023 Grist Labs, Inc. 2 | 3 | Licensed under the Apache License, Version 2.0 (the "License"); 4 | you may not use this file except in compliance with the License. 5 | You may obtain a copy of the License at 6 | 7 | http://www.apache.org/licenses/LICENSE-2.0 8 | 9 | Unless required by applicable law or agreed to in writing, software 10 | distributed under the License is distributed on an "AS IS" BASIS, 11 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 | See the License for the specific language governing permissions and 13 | limitations under the License. 14 | -------------------------------------------------------------------------------- /cli.js: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env node 2 | "use strict"; 3 | 4 | const {readFile} = require('fs'); 5 | const {yamlDump, yamlParse} = require('.'); 6 | 7 | function main(filePath) { 8 | return readFile(filePath, 'utf8', (err, text) => { 9 | if (err) { 10 | console.log(`Error reading ${filePath}: ${err}`); 11 | return; 12 | } 13 | let isYaml, data; 14 | try { 15 | data = JSON.parse(text); 16 | isYaml = false; 17 | } catch (e) { 18 | data = yamlParse(text); 19 | isYaml = true; 20 | } 21 | console.log(isYaml ? 22 | JSON.stringify(data, null, 2) : 23 | yamlDump(data)); 24 | }); 25 | } 26 | 27 | if (require.main === module) { 28 | if (process.argv.length !== 3) { 29 | console.log(`Usage: ${process.argv[1]} `); 30 | process.exit(1); 31 | } else { 32 | main(process.argv[2]); 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "yaml-cfn", 3 | "version": "0.3.2", 4 | "description": "Parser and schema for CloudFormation YAML template tags.", 5 | "scripts": { 6 | "test": "mocha -R list test/" 7 | }, 8 | "main": "index.js", 9 | "bin": { 10 | "yaml-cfn": "cli.js" 11 | }, 12 | "repository": { 13 | "type": "git", 14 | "url": "git+https://github.com/gristlabs/yaml-cfn.git" 15 | }, 16 | "keywords": [ 17 | "yaml", 18 | "cloudformation", 19 | "aws", 20 | "json" 21 | ], 22 | "author": "Dmitry S, Grist Labs", 23 | "license": "Apache-2.0", 24 | "bugs": { 25 | "url": "https://github.com/gristlabs/yaml-cfn/issues" 26 | }, 27 | "homepage": "https://github.com/gristlabs/yaml-cfn#readme", 28 | "dependencies": { 29 | "js-yaml": "^4.0.0" 30 | }, 31 | "devDependencies": { 32 | "@types/js-yaml": "^4.0.0", 33 | "mocha": "^10.1.0" 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # yaml-cfn 2 | 3 | ![CI](https://github.com/gristlabs/yaml-cfn/workflows/CI/badge.svg) 4 | [![npm version](https://badge.fury.io/js/yaml-cfn.svg)](https://badge.fury.io/js/yaml-cfn) 5 | 6 | > Parser and schema for CloudFormation YAML template tags. 7 | 8 | Implements support for AWS-specific CloudFormation YAML schema. 9 | 10 | The implementation and tests are based on the official AWS Python client 11 | [aws-cli](https://github.com/aws/aws-cli). It supports all intrinsic CloudFormation functions listed in 12 | [AWS docs](http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference.html) 13 | as of October 2017. 14 | 15 | ## Installation 16 | 17 | ```bash 18 | npm install --save-dev yaml-cfn 19 | ``` 20 | 21 | ## Usage 22 | 23 | ```js 24 | const { yamlParse, yamlDump } = require('yaml-cfn'); 25 | 26 | const input = ` 27 | Key: 28 | - !GetAtt Foo.Bar 29 | - !Equals [!Ref Baz, "hello"] 30 | `; 31 | 32 | const parsed = { 33 | "Key": [ 34 | {"Fn::GetAtt": ["Foo", "Bar"]}, 35 | {"Fn::Equals": [{"Ref": "Baz"}, "hello"]} 36 | ] 37 | }; 38 | 39 | assert.deepEqual(yamlParse(input), parsed); 40 | assert.deepEqual(yamlParse(yamlDump(parsed)), parsed); 41 | ``` 42 | 43 | The module uses [js-yaml](https://github.com/nodeca/js-yaml). The schema it uses is also exported, 44 | and may be used e.g. like so: 45 | ```js 46 | const { schema } = require('yaml-cfn'); 47 | const yaml = require('js-yaml'); 48 | yaml.safeLoad(input, { schema: schema }) 49 | ``` 50 | -------------------------------------------------------------------------------- /test/test-main.js: -------------------------------------------------------------------------------- 1 | /** 2 | * This test is based on the test in the official AWS python client: 3 | * https://github.com/aws/aws-cli/blob/develop/tests/unit/customizations/cloudformation/test_yamlhelper.py 4 | */ 5 | "use strict"; 6 | 7 | /* global describe, it */ 8 | 9 | const assert = require('assert'); 10 | const { yamlParse, yamlDump } = require('../index'); 11 | 12 | 13 | describe('yaml-schema', function() { 14 | const yamlWithTags = ` 15 | Resource: 16 | Key1: !Ref Something 17 | Key2: !GetAtt Another.Arn 18 | Key3: !Equals [!Base64 YetAnother, "hello"] 19 | Key4: !Sub {"a": "1"} 20 | Key5: !GetAtt OneMore.Outputs.Arn 21 | Key6: !Condition OtherCondition 22 | Key7: !EachMemberEquals 1 23 | `; 24 | 25 | const parsedYamlDict = { 26 | "Resource": { 27 | "Key1": { 28 | "Ref": "Something" 29 | }, 30 | "Key2": { 31 | "Fn::GetAtt": ["Another", "Arn"] 32 | }, 33 | "Key3": { 34 | "Fn::Equals": [ 35 | {"Fn::Base64": "YetAnother"}, 36 | "hello" 37 | ] 38 | }, 39 | "Key4": { 40 | "Fn::Sub": { 41 | "a": "1" 42 | } 43 | }, 44 | "Key5": { 45 | "Fn::GetAtt": ["OneMore", "Outputs.Arn"] 46 | }, 47 | "Key6": { 48 | "Condition": "OtherCondition" 49 | }, 50 | "Key7": { 51 | "Fn::EachMemberEquals": "1" 52 | } 53 | } 54 | }; 55 | 56 | it("should parse yaml with tags", function() { 57 | const output = yamlParse(yamlWithTags); 58 | assert.deepEqual(output, parsedYamlDict); 59 | 60 | // Make sure formatter and parser work well with each other. 61 | const formatted = yamlDump(output); 62 | const outputAgain = yamlParse(formatted); 63 | assert.deepEqual(output, outputAgain); 64 | }); 65 | 66 | it("should handle GetAtt even if invalid", function() { 67 | // This tests is as it exists in the python test at https://github.com/aws/aws-cli. 68 | // This is an invalid syntax for !GetAtt. But make sure the code does not crash when we encouter this syntax. 69 | // Let CloudFormation interpret this value at runtime. 70 | const input = ` 71 | Resource: 72 | Key: !GetAtt ["a", "b"] 73 | `; 74 | const output = { 75 | "Resource": { 76 | "Key": { 77 | "Fn::GetAtt": ["a", "b"] 78 | } 79 | } 80 | }; 81 | 82 | const actualOutput = yamlParse(input); 83 | assert.deepEqual(actualOutput, output); 84 | }); 85 | 86 | it("should handle json with tabs", function() { 87 | const template = '{\n\t"foo": "bar"\n}'; 88 | const output = yamlParse(template); 89 | assert.deepEqual(output, {'foo': 'bar'}); 90 | }); 91 | 92 | it("should handle the example from the README", function() { 93 | const input = ` 94 | Key: 95 | - !GetAtt Foo.Bar 96 | - !Equals [!Ref Baz, "hello"] 97 | `; 98 | 99 | const parsed = { 100 | "Key": [ 101 | {"Fn::GetAtt": ["Foo", "Bar"]}, 102 | {"Fn::Equals": [{"Ref": "Baz"}, "hello"]} 103 | ] 104 | }; 105 | 106 | assert.deepEqual(yamlParse(input), parsed); 107 | assert.deepEqual(yamlParse(yamlDump(parsed)), parsed); 108 | }); 109 | 110 | it("should parse date-like strings as strings", function() { 111 | const input = ` 112 | Key: 113 | - 2001-11-01 114 | - '2001-11-02' 115 | `; 116 | 117 | const parsed = { 118 | "Key": [ 119 | "2001-11-01", 120 | "2001-11-02" 121 | ] 122 | }; 123 | 124 | assert.deepEqual(yamlParse(input), parsed); 125 | assert.deepEqual(yamlParse(yamlDump(parsed)), parsed); 126 | }); 127 | }); 128 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Parser and schema for CloudFormation YAML template tags. 3 | * 4 | * There are some existing modules out there: 5 | * https://github.com/yyolk/cloudformation-js-yaml-schema 6 | * https://github.com/KoharaKazuya/js-yaml-schema-cfn 7 | * But both are poorly documented, with insufficient tests, and don't fully work. 8 | * 9 | * This implementation is based on the official AWS python client: 10 | * https://github.com/aws/aws-cli/blob/develop/awscli/customizations/cloudformation/yamlhelper.py 11 | */ 12 | "use strict"; 13 | 14 | const jsYaml = require('js-yaml'); 15 | 16 | /** 17 | * Split a string on the given separator just once, returning an array of two parts, or null. 18 | */ 19 | function splitOne(str, sep) { 20 | let index = str.indexOf(sep); 21 | return index < 0 ? null : [str.slice(0, index), str.slice(index + sep.length)]; 22 | } 23 | 24 | /** 25 | * Returns true if obj is a representation of a CloudFormation intrinsic, i.e. an object with a 26 | * single property at key keyName. 27 | */ 28 | function checkType(obj, keyName) { 29 | return obj && typeof obj === 'object' && Object.keys(obj).length === 1 && 30 | obj.hasOwnProperty(keyName); 31 | } 32 | 33 | 34 | const overrides = { 35 | // ShortHand notation for !GetAtt accepts Resource.Attribute format while the standard notation 36 | // is to use an array [Resource, Attribute]. Convert shorthand to standard format. 37 | GetAtt: { 38 | parse: data => typeof data === 'string' ? splitOne(data, '.') : data, 39 | dump: data => data.join('.') 40 | } 41 | }; 42 | 43 | function applyOverrides(data, tag, method) { 44 | return overrides[tag] ? overrides[tag][method](data) : data; 45 | } 46 | 47 | /** 48 | * Generic tag-creating helper. For the given name of the form 'Fn::Something' (or just 49 | * 'Something'), creates a js-yaml Type object that can parse and dump this type. It creates it 50 | * for all types of values, for simplicity and because that's how the official Python version 51 | * works. 52 | */ 53 | function makeTagTypes(name) { 54 | const parts = splitOne(name, '::'); 55 | const tag = parts ? parts[1] : name; 56 | // Translate in the same way for all types, to match Python's generic translation. 57 | return ['scalar', 'sequence', 'mapping'].map(kind => new jsYaml.Type('!' + tag, { 58 | kind: kind, 59 | construct: data => ({[name]: applyOverrides(data, tag, 'parse')}), 60 | predicate: obj => checkType(obj, name), 61 | represent: obj => applyOverrides(obj[name], tag, 'dump'), 62 | })); 63 | } 64 | 65 | /** 66 | * This list is from 67 | * http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference.html 68 | * Note that the Python version handles ANY tag that starts with ! in the same way (translating it 69 | * to Fn:: prefix, but js-yaml requires listing tags explicitly. 70 | */ 71 | const supportedFunctions = [ 72 | 'Fn::Base64', 73 | 'Fn::Cidr', 74 | 'Fn::FindInMap', 75 | 'Fn::GetAtt', 76 | 'Fn::GetAZs', 77 | 'Fn::ImportValue', 78 | 'Fn::Join', 79 | 'Fn::Select', 80 | 'Fn::Split', 81 | 'Fn::Sub', 82 | 'Fn::Transform', 83 | 'Ref', 84 | 'Condition', 85 | 'Fn::And', 86 | 'Fn::Equals', 87 | 'Fn::If', 88 | 'Fn::Not', 89 | 'Fn::Or' 90 | ]; 91 | 92 | /** 93 | * This list is from 94 | * https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-rules.html 95 | * This is not comprehensive, as it doesn't include 96 | * - Supported Functions - https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-rules.html#supported-rule-functions 97 | * - Supported Attributes - https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-rules.html#rules-parameter-attributes 98 | * Note that the Python version handles ANY tag that starts with ! in the same way (translating it 99 | * to Fn:: prefix, but js-yaml requires listing tags explicitly. 100 | */ 101 | 102 | const ruleFunctions = [ 103 | 'Fn::And', 104 | 'Fn::Contains', 105 | 'Fn::EachMemberEquals', 106 | 'Fn::EachMemberIn', 107 | 'Fn::Equals', 108 | 'Fn::Not', 109 | 'Fn::Or', 110 | 'Fn::RefAll', 111 | 'Fn::ValueOf', 112 | 'Fn::ValueOfAll' 113 | ] 114 | 115 | 116 | let allTagTypes = [] 117 | let allFunctions = [...supportedFunctions, ...ruleFunctions] 118 | 119 | 120 | for (let name of allFunctions) { 121 | allTagTypes.push(...makeTagTypes(name)); 122 | } 123 | 124 | 125 | /** 126 | * The actual js-yaml schema, extending the DEFAULT_SAFE_SCHEMA. 127 | */ 128 | const schema = jsYaml.CORE_SCHEMA.extend({ 129 | implicit: [], 130 | explicit: allTagTypes, 131 | }); 132 | exports.schema = schema; 133 | 134 | 135 | /** 136 | * Convenience function to parse the given yaml input. 137 | */ 138 | function yamlParse(input) { 139 | return jsYaml.load(input, { schema: schema }); 140 | } 141 | exports.yamlParse = yamlParse; 142 | 143 | 144 | /** 145 | * Convenience function to serialize the given object to Yaml. 146 | */ 147 | function yamlDump(input) { 148 | return jsYaml.dump(input, { schema: schema }); 149 | } 150 | exports.yamlDump = yamlDump; 151 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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