Parse parameters from a file

Author: tjovicic

.gitignore

@@ -96,4 +96,7 @@ Thumbs.db
 
 # Ignore built ts files
 __tests__/runner/*
-lib/**/*
+lib/**/*
+
+# Intellij IDEA metadata
+.idea/

__tests__/params.test.json

@@ -0,0 +1,10 @@
+[
+  {
+    "ParameterKey": "MyParam1",
+    "ParameterValue": "myValue1"
+  },
+  {
+    "ParameterKey": "MyParam2",
+    "ParameterValue": "myValue2"
+  }
+]

__tests__/utils.test.ts

@@ -1,7 +1,6 @@
-import { parseTags, isUrl } from '../src/utils'
+import { parseTags, isUrl, parseParameters } from '../src/utils'
 
 jest.mock('@actions/core')
-jest.mock('fs')
 
 describe('Determine a valid url', () => {
   beforeEach(() => {
@@ -36,3 +35,38 @@ describe('Parse Tags', () => {
     expect(json).toEqual([{ Key: 'Test', Value: 'Value' }])
   })
 })
+
+describe('Parse Parameters', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  test('returns parameters list from string', async () => {
+    const json = parseParameters('MyParam1=myValue1,MyParam2=myValue2')
+    expect(json).toEqual([
+      {
+        ParameterKey: 'MyParam1',
+        ParameterValue: 'myValue1'
+      },
+      {
+        ParameterKey: 'MyParam2',
+        ParameterValue: 'myValue2'
+      }
+    ])
+  })
+
+  test('returns parameters list from file', async () => {
+    const filename = 'file://__tests__/params.test.json'
+    const json = parseParameters(filename)
+    expect(json).toEqual([
+      {
+        ParameterKey: 'MyParam1',
+        ParameterValue: 'myValue1'
+      },
+      {
+        ParameterKey: 'MyParam2',
+        ParameterValue: 'myValue2'
+      }
+    ])
+  })
+})

src/main.ts

@@ -3,7 +3,14 @@ import * as core from '@actions/core'
 import * as aws from 'aws-sdk'
 import * as fs from 'fs'
 import { deployStack, getStackOutputs } from './deploy'
-import { isUrl, parseTags, parseString, parseNumber, parseARNs } from './utils'
+import {
+  isUrl,
+  parseTags,
+  parseString,
+  parseNumber,
+  parseARNs,
+  parseParameters
+} from './utils'
 
 export type CreateStackInput = aws.CloudFormation.Types.CreateStackInput
 export type CreateChangeSetInput = aws.CloudFormation.Types.CreateChangeSetInput
@@ -96,15 +103,7 @@ export async function run(): Promise<void> {
     }
 
     if (parameterOverrides) {
-      params.Parameters = [
-        ...parameterOverrides.split(',').map(parameter => {
-          const [key, value] = parameter.trim().split('=')
-          return {
-            ParameterKey: key,
-            ParameterValue: value
-          }
-        })
-      ]
+      params.Parameters = parseParameters(parameterOverrides)
     }
 
     const stackId = await deployStack(cfn, params, noEmptyChangeSet)

src/utils.ts

@@ -1,4 +1,6 @@
 import * as aws from 'aws-sdk'
+import * as fs from 'fs'
+import { Parameter } from 'aws-sdk/clients/cloudformation'
 
 export function isUrl(s: string): boolean {
   let url
@@ -33,3 +35,25 @@ export function parseString(s: string): string | undefined {
 export function parseNumber(s: string): number | undefined {
   return parseInt(s) || undefined
 }
+
+export function parseParameters(parameterOverrides: string): Parameter[] {
+  if (parameterOverrides.trim().startsWith('file://')) {
+    const path = parameterOverrides.trim().replace('file://', './')
+    if (!fs.existsSync(path)) {
+      throw new Error('parameter input file does not exist')
+    }
+
+    const rawParameters = fs.readFileSync(path, 'utf-8')
+    return JSON.parse(rawParameters)
+  }
+
+  return [
+    ...parameterOverrides.split(',').map(parameter => {
+      const [key, value] = parameter.trim().split('=')
+      return {
+        ParameterKey: key,
+        ParameterValue: value
+      }
+    })
+  ]
+}