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index.js
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index.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.handler = exports.forceSdkInstallation = exports.flatten = exports.PHYSICAL_RESOURCE_ID_REFERENCE = void 0;
/* eslint-disable no-console */
const child_process_1 = require("child_process");
const fs = require("fs");
const path_1 = require("path");
/**
* Serialized form of the physical resource id for use in the operation parameters
*/
exports.PHYSICAL_RESOURCE_ID_REFERENCE = 'PHYSICAL:RESOURCEID:';
/**
* Flattens a nested object
*
* @param object the object to be flattened
* @returns a flat object with path as keys
*/
function flatten(object) {
return Object.assign({}, ...function _flatten(child, path = []) {
return [].concat(...Object.keys(child)
.map(key => {
const childKey = Buffer.isBuffer(child[key]) ? child[key].toString('utf8') : child[key];
return typeof childKey === 'object' && childKey !== null
? _flatten(childKey, path.concat([key]))
: ({ [path.concat([key]).join('.')]: childKey });
}));
}(object));
}
exports.flatten = flatten;
/**
* Decodes encoded special values (physicalResourceId)
*/
function decodeSpecialValues(object, physicalResourceId) {
return JSON.parse(JSON.stringify(object), (_k, v) => {
switch (v) {
case exports.PHYSICAL_RESOURCE_ID_REFERENCE:
return physicalResourceId;
default:
return v;
}
});
}
/**
* Filters the keys of an object.
*/
function filterKeys(object, pred) {
return Object.entries(object)
.reduce((acc, [k, v]) => pred(k)
? { ...acc, [k]: v }
: acc, {});
}
let latestSdkInstalled = false;
function forceSdkInstallation() {
latestSdkInstalled = false;
}
exports.forceSdkInstallation = forceSdkInstallation;
/**
* Installs latest AWS SDK v2
*/
function installLatestSdk() {
console.log('Installing latest AWS SDK v2');
// Both HOME and --prefix are needed here because /tmp is the only writable location
child_process_1.execSync('HOME=/tmp npm install aws-sdk@2 --production --no-package-lock --no-save --prefix /tmp');
latestSdkInstalled = true;
}
// no currently patched services
const patchedServices = [];
/**
* Patches the AWS SDK by loading service models in the same manner as the actual SDK
*/
function patchSdk(awsSdk) {
const apiLoader = awsSdk.apiLoader;
patchedServices.forEach(({ serviceName, apiVersions }) => {
const lowerServiceName = serviceName.toLowerCase();
if (!awsSdk.Service.hasService(lowerServiceName)) {
apiLoader.services[lowerServiceName] = {};
awsSdk[serviceName] = awsSdk.Service.defineService(lowerServiceName, apiVersions);
}
else {
awsSdk.Service.addVersions(awsSdk[serviceName], apiVersions);
}
apiVersions.forEach(apiVersion => {
Object.defineProperty(apiLoader.services[lowerServiceName], apiVersion, {
get: function get() {
const modelFilePrefix = `aws-sdk-patch/${lowerServiceName}-${apiVersion}`;
const model = JSON.parse(fs.readFileSync(path_1.join(__dirname, `${modelFilePrefix}.service.json`), 'utf-8'));
model.paginators = JSON.parse(fs.readFileSync(path_1.join(__dirname, `${modelFilePrefix}.paginators.json`), 'utf-8')).pagination;
return model;
},
enumerable: true,
configurable: true,
});
});
});
return awsSdk;
}
/* eslint-disable @typescript-eslint/no-require-imports, import/no-extraneous-dependencies */
async function handler(event, context) {
try {
let AWS;
if (!latestSdkInstalled && event.ResourceProperties.InstallLatestAwsSdk === 'true') {
try {
installLatestSdk();
AWS = require('/tmp/node_modules/aws-sdk');
}
catch (e) {
console.log(`Failed to install latest AWS SDK v2: ${e}`);
AWS = require('aws-sdk'); // Fallback to pre-installed version
}
}
else if (latestSdkInstalled) {
AWS = require('/tmp/node_modules/aws-sdk');
}
else {
AWS = require('aws-sdk');
}
try {
AWS = patchSdk(AWS);
}
catch (e) {
console.log(`Failed to patch AWS SDK: ${e}. Proceeding with the installed copy.`);
}
console.log(JSON.stringify({ ...event, ResponseURL: '...' }));
console.log('AWS SDK VERSION: ' + AWS.VERSION);
event.ResourceProperties.Create = decodeCall(event.ResourceProperties.Create);
event.ResourceProperties.Update = decodeCall(event.ResourceProperties.Update);
event.ResourceProperties.Delete = decodeCall(event.ResourceProperties.Delete);
// Default physical resource id
let physicalResourceId;
switch (event.RequestType) {
case 'Create':
physicalResourceId = event.ResourceProperties.Create?.physicalResourceId?.id ??
event.ResourceProperties.Update?.physicalResourceId?.id ??
event.ResourceProperties.Delete?.physicalResourceId?.id ??
event.LogicalResourceId;
break;
case 'Update':
case 'Delete':
physicalResourceId = event.ResourceProperties[event.RequestType]?.physicalResourceId?.id ?? event.PhysicalResourceId;
break;
}
let flatData = {};
let data = {};
const call = event.ResourceProperties[event.RequestType];
if (call) {
let credentials;
if (call.assumedRoleArn) {
const timestamp = (new Date()).getTime();
const params = {
RoleArn: call.assumedRoleArn,
RoleSessionName: `${timestamp}-${physicalResourceId}`.substring(0, 64),
};
credentials = new AWS.ChainableTemporaryCredentials({
params: params,
});
}
if (!Object.prototype.hasOwnProperty.call(AWS, call.service)) {
throw Error(`Service ${call.service} does not exist in AWS SDK version ${AWS.VERSION}.`);
}
const awsService = new AWS[call.service]({
apiVersion: call.apiVersion,
credentials: credentials,
region: call.region,
});
try {
const response = await awsService[call.action](call.parameters && decodeSpecialValues(call.parameters, physicalResourceId)).promise();
flatData = {
apiVersion: awsService.config.apiVersion,
region: awsService.config.region,
...flatten(response),
};
let outputPaths;
if (call.outputPath) {
outputPaths = [call.outputPath];
}
else if (call.outputPaths) {
outputPaths = call.outputPaths;
}
if (outputPaths) {
data = filterKeys(flatData, startsWithOneOf(outputPaths));
}
else {
data = flatData;
}
}
catch (e) {
if (!call.ignoreErrorCodesMatching || !new RegExp(call.ignoreErrorCodesMatching).test(e.code)) {
throw e;
}
}
if (call.physicalResourceId?.responsePath) {
physicalResourceId = flatData[call.physicalResourceId.responsePath];
}
}
await respond('SUCCESS', 'OK', physicalResourceId, data);
}
catch (e) {
console.log(e);
await respond('FAILED', e.message || 'Internal Error', context.logStreamName, {});
}
function respond(responseStatus, reason, physicalResourceId, data) {
const responseBody = JSON.stringify({
Status: responseStatus,
Reason: reason,
PhysicalResourceId: physicalResourceId,
StackId: event.StackId,
RequestId: event.RequestId,
LogicalResourceId: event.LogicalResourceId,
NoEcho: false,
Data: data,
});
console.log('Responding', responseBody);
// eslint-disable-next-line @typescript-eslint/no-require-imports
const parsedUrl = require('url').parse(event.ResponseURL);
const requestOptions = {
hostname: parsedUrl.hostname,
path: parsedUrl.path,
method: 'PUT',
headers: { 'content-type': '', 'content-length': responseBody.length },
};
return new Promise((resolve, reject) => {
try {
// eslint-disable-next-line @typescript-eslint/no-require-imports
const request = require('https').request(requestOptions, resolve);
request.on('error', reject);
request.write(responseBody);
request.end();
}
catch (e) {
reject(e);
}
});
}
}
exports.handler = handler;
function decodeCall(call) {
if (!call) {
return undefined;
}
return JSON.parse(call);
}
function startsWithOneOf(searchStrings) {
return function (string) {
for (const searchString of searchStrings) {
if (string.startsWith(searchString)) {
return true;
}
}
return false;
};
}
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[].concat(...Object.keys(child)\n        .map(key => {\n          const childKey = Buffer.isBuffer(child[key]) ? child[key].toString('utf8') : child[key];\n          return typeof childKey === 'object' && childKey !== null\n            ? _flatten(childKey, path.concat([key]))\n            : ({ [path.concat([key]).join('.')]: childKey });\n        }));\n    }(object),\n  );\n}\n\n/**\n * Decodes encoded special values (physicalResourceId)\n */\nfunction decodeSpecialValues(object: object, physicalResourceId: string) {\n  return JSON.parse(JSON.stringify(object), (_k, v) => {\n    switch (v) {\n      case PHYSICAL_RESOURCE_ID_REFERENCE:\n        return physicalResourceId;\n      default:\n        return v;\n    }\n  });\n}\n\n/**\n * Filters the keys of an object.\n */\nfunction filterKeys(object: object, pred: (key: string) => boolean) {\n  return Object.entries(object)\n    .reduce(\n      (acc, [k, v]) => pred(k)\n        ? { ...acc, [k]: v }\n        : acc,\n      {},\n    );\n}\n\nlet latestSdkInstalled = false;\n\nexport function forceSdkInstallation() {\n  latestSdkInstalled = false;\n}\n\n/**\n * Installs latest AWS SDK v2\n */\nfunction installLatestSdk(): void {\n  console.log('Installing latest AWS SDK v2');\n  // Both HOME and --prefix are needed here because /tmp is the only writable location\n  execSync('HOME=/tmp npm install aws-sdk@2 --production --no-package-lock --no-save --prefix /tmp');\n  latestSdkInstalled = true;\n}\n\n// no currently patched services\nconst patchedServices: { serviceName: string; apiVersions: string[] }[] = [];\n/**\n * Patches the AWS SDK by loading service models in the same manner as the actual SDK\n */\nfunction patchSdk(awsSdk: any): any {\n  const apiLoader = awsSdk.apiLoader;\n  patchedServices.forEach(({ serviceName, apiVersions }) => {\n    const lowerServiceName = serviceName.toLowerCase();\n    if (!awsSdk.Service.hasService(lowerServiceName)) {\n      apiLoader.services[lowerServiceName] = {};\n      awsSdk[serviceName] = awsSdk.Service.defineService(lowerServiceName, apiVersions);\n    } else {\n      awsSdk.Service.addVersions(awsSdk[serviceName], apiVersions);\n    }\n    apiVersions.forEach(apiVersion => {\n      Object.defineProperty(apiLoader.services[lowerServiceName], apiVersion, {\n        get: function get() {\n          const modelFilePrefix = `aws-sdk-patch/${lowerServiceName}-${apiVersion}`;\n          const model = JSON.parse(fs.readFileSync(join(__dirname, `${modelFilePrefix}.service.json`), 'utf-8'));\n          model.paginators = JSON.parse(fs.readFileSync(join(__dirname, `${modelFilePrefix}.paginators.json`), 'utf-8')).pagination;\n          return model;\n        },\n        enumerable: true,\n        configurable: true,\n      });\n    });\n  });\n  return awsSdk;\n}\n\n/* eslint-disable @typescript-eslint/no-require-imports, import/no-extraneous-dependencies */\nexport async function handler(event: AWSLambda.CloudFormationCustomResourceEvent, context: AWSLambda.Context) {\n  try {\n    let AWS: any;\n    if (!latestSdkInstalled && event.ResourceProperties.InstallLatestAwsSdk === 'true') {\n      try {\n        installLatestSdk();\n        AWS = require('/tmp/node_modules/aws-sdk');\n      } catch (e) {\n        console.log(`Failed to install latest AWS SDK v2: ${e}`);\n        AWS = require('aws-sdk'); // Fallback to pre-installed version\n      }\n    } else if (latestSdkInstalled) {\n      AWS = require('/tmp/node_modules/aws-sdk');\n    } else {\n      AWS = require('aws-sdk');\n    }\n    try {\n      AWS = patchSdk(AWS);\n    } catch (e) {\n      console.log(`Failed to patch AWS SDK: ${e}. Proceeding with the installed copy.`);\n    }\n\n    console.log(JSON.stringify({ ...event, ResponseURL: '...' }));\n    console.log('AWS SDK VERSION: ' + AWS.VERSION);\n\n    event.ResourceProperties.Create = decodeCall(event.ResourceProperties.Create);\n    event.ResourceProperties.Update = decodeCall(event.ResourceProperties.Update);\n    event.ResourceProperties.Delete = decodeCall(event.ResourceProperties.Delete);\n    // Default physical resource id\n    let physicalResourceId: string;\n    switch (event.RequestType) {\n      case 'Create':\n        physicalResourceId = event.ResourceProperties.Create?.physicalResourceId?.id ??\n                             event.ResourceProperties.Update?.physicalResourceId?.id ??\n                             event.ResourceProperties.Delete?.physicalResourceId?.id ??\n                             event.LogicalResourceId;\n        break;\n      case 'Update':\n      case 'Delete':\n        physicalResourceId = event.ResourceProperties[event.RequestType]?.physicalResourceId?.id ?? event.PhysicalResourceId;\n        break;\n    }\n\n    let flatData: { [key: string]: string } = {};\n    let data: { [key: string]: string } = {};\n    const call: AwsSdkCall | undefined = event.ResourceProperties[event.RequestType];\n\n    if (call) {\n\n      let credentials;\n      if (call.assumedRoleArn) {\n        const timestamp = (new Date()).getTime();\n\n        const params = {\n          RoleArn: call.assumedRoleArn,\n          RoleSessionName: `${timestamp}-${physicalResourceId}`.substring(0, 64),\n        };\n\n        credentials = new AWS.ChainableTemporaryCredentials({\n          params: params,\n        });\n      }\n\n      if (!Object.prototype.hasOwnProperty.call(AWS, call.service)) {\n        throw Error(`Service ${call.service} does not exist in AWS SDK version ${AWS.VERSION}.`);\n      }\n      const awsService = new (AWS as any)[call.service]({\n        apiVersion: call.apiVersion,\n        credentials: credentials,\n        region: call.region,\n      });\n\n      try {\n        const response = await awsService[call.action](\n          call.parameters && decodeSpecialValues(call.parameters, physicalResourceId)).promise();\n        flatData = {\n          apiVersion: awsService.config.apiVersion, // For test purposes: check if apiVersion was correctly passed.\n          region: awsService.config.region, // For test purposes: check if region was correctly passed.\n          ...flatten(response),\n        };\n\n        let outputPaths: string[] | undefined;\n        if (call.outputPath) {\n          outputPaths = [call.outputPath];\n        } else if (call.outputPaths) {\n          outputPaths = call.outputPaths;\n        }\n\n        if (outputPaths) {\n          data = filterKeys(flatData, startsWithOneOf(outputPaths));\n        } else {\n          data = flatData;\n        }\n      } catch (e) {\n        if (!call.ignoreErrorCodesMatching || !new RegExp(call.ignoreErrorCodesMatching).test(e.code)) {\n          throw e;\n        }\n      }\n\n      if (call.physicalResourceId?.responsePath) {\n        physicalResourceId = flatData[call.physicalResourceId.responsePath];\n      }\n    }\n\n    await respond('SUCCESS', 'OK', physicalResourceId, data);\n  } catch (e) {\n    console.log(e);\n    await respond('FAILED', e.message || 'Internal Error', context.logStreamName, {});\n  }\n\n  function respond(responseStatus: string, reason: string, physicalResourceId: string, data: any) {\n    const responseBody = JSON.stringify({\n      Status: responseStatus,\n      Reason: reason,\n      PhysicalResourceId: physicalResourceId,\n      StackId: event.StackId,\n      RequestId: event.RequestId,\n      LogicalResourceId: event.LogicalResourceId,\n      NoEcho: false,\n      Data: data,\n    });\n\n    console.log('Responding', responseBody);\n\n    // eslint-disable-next-line @typescript-eslint/no-require-imports\n    const parsedUrl = require('url').parse(event.ResponseURL);\n    const requestOptions = {\n      hostname: parsedUrl.hostname,\n      path: parsedUrl.path,\n      method: 'PUT',\n      headers: { 'content-type': '', 'content-length': responseBody.length },\n    };\n\n    return new Promise((resolve, reject) => {\n      try {\n        // eslint-disable-next-line @typescript-eslint/no-require-imports\n        const request = require('https').request(requestOptions, resolve);\n        request.on('error', reject);\n        request.write(responseBody);\n        request.end();\n      } catch (e) {\n        reject(e);\n      }\n    });\n  }\n}\n\nfunction decodeCall(call: string | undefined) {\n  if (!call) { return undefined; }\n  return JSON.parse(call);\n}\n\nfunction startsWithOneOf(searchStrings: string[]): (string: string) => boolean {\n  return function(string: string): boolean {\n    for (const searchString of searchStrings) {\n      if (string.startsWith(searchString)) {\n        return true;\n      }\n    }\n    return false;\n  };\n}\n"]}