Refactor downloader (#448)

* Refactor: Move downloader to a class * Use BearerCredentialHandler from typed-rest-client for authentication Add http response mock to unit tests
2026-10-04 08:54:36 +03:00 · 2022-06-06 21:27:38 +02:00
1 parent 6785de63f4
commit e0d223890b
@@ -1,18 +1,59 @@
-import {IReleaseDownloadSettings} from "../src/download-settings"
-import {download} from "../src/download"
+import * as core from "@actions/core"
+import * as fs from "fs"
+import * as handlers from "typed-rest-client/Handlers"
+import * as io from "@actions/io"
+import * as thc from "typed-rest-client/HttpClient"

-test("run download", async () => {
-  
-  const githubtoken = process.env.GITHUB_TOKEN ?? ""
+import {IReleaseDownloadSettings} from "../src/download-settings"
+import {ReleaseDownloader} from "../src/release-downloader"
+
+const nock = require("nock")
+
+let downloader: ReleaseDownloader
+let httpClent: thc.HttpClient
+const outputFilePath = "./target"
+
+beforeAll(() => {
+  const githubtoken = process.env.REPO_TOKEN || ""
+
+  const credentialHandler = new handlers.BearerCredentialHandler(
+    githubtoken,
+    false
+  )
+  httpClent = new thc.HttpClient("gh-api-client", [credentialHandler])
+  downloader = new ReleaseDownloader(httpClent)
+
+  nock("https://api.github.com")
+    .get("/repos/robinraju/probable-potato/releases/latest")
+    .reply(200, readFromFile("1-release-latest.json"))
+
+  nock("https://api.github.com", {
+    reqheaders: {accept: "application/octet-stream"}
+  })
+    .get("/repos/robinraju/probable-potato/releases/assets/66946546")
+    .replyWithFile(200, __dirname + "/resource/assets/test-1.txt")
+})
+
+afterAll(() => {
+  io.rmRF(outputFilePath)
+})
+
+function readFromFile(fileName: string): string {
+  return fs.readFileSync(`./__tests__/resource/${fileName}`, {
+    encoding: "utf-8"
+  })
+}
+
+test("Download from public repo", async () => {
  const downloadSettings: IReleaseDownloadSettings = {
-    sourceRepoPath: "lihaoyi/Ammonite",
-    isLatest: false,
-    tag: "2.1.1",
-    fileName: "2.13-2.1.1-14-4f2a1b2-bootstrap",
+    sourceRepoPath: "robinraju/probable-potato",
+    isLatest: true,
+    tag: "",
+    fileName: "*",
    tarBall: false,
    zipBall: false,
-    outFilePath: "./target",
-    token: githubtoken
+    outFilePath: outputFilePath
  }
-  await download(downloadSettings)
+  const result = await downloader.download(downloadSettings)
+  expect(result.length).toBe(1)
 }, 10000)
@@ -0,0 +1,36 @@
+{
+    "url": "https://api.github.com/repos/robinraju/probable-potato/releases/68092191",
+    "assets_url": "https://api.github.com/repos/robinraju/probable-potato/releases/68092191/assets",
+    "upload_url": "https://uploads.github.com/repos/robinraju/probable-potato/releases/68092191/assets{?name,label}",
+    "html_url": "https://github.com/robinraju/probable-potato/releases/tag/1.0.1",
+    "id": 68092191,
+    "author": {},
+    "node_id": "RE_kwDOHahpL84EDwEf",
+    "tag_name": "1.0.1",
+    "target_commitish": "main",
+    "name": "Probable potato - v1.0.1",
+    "draft": false,
+    "prerelease": false,
+    "created_at": "2022-05-29T12:03:47Z",
+    "published_at": "2022-05-29T12:04:42Z",
+    "assets": [
+        {
+            "url": "https://api.github.com/repos/robinraju/probable-potato/releases/assets/66946546",
+            "id": 66946546,
+            "node_id": "RA_kwDOHahpL84D_YXy",
+            "name": "test-1.txt",
+            "label": null,
+            "uploader": {},
+            "content_type": "image/jpeg",
+            "state": "uploaded",
+            "size": 7253,
+            "download_count": 56,
+            "created_at": "2022-05-29T12:08:23Z",
+            "updated_at": "2022-05-29T12:08:23Z",
+            "browser_download_url": "https://github.com/robinraju/probable-potato/releases/download/1.0.1/potato.jpeg"
+        }
+    ],
+    "tarball_url": "https://api.github.com/repos/robinraju/probable-potato/tarball/1.0.1",
+    "zipball_url": "https://api.github.com/repos/robinraju/probable-potato/zipball/1.0.1",
+    "body": ""
+}
@@ -0,0 +1 @@
+v1.0 robinraju/probable-potato/releases/latest
@@ -16,7 +16,7 @@ inputs:
    required: false
  fileName:
    description: "Name of the file to download (use '*' to download all assets other than tarball or zipball)"
-    default: ""
+    default: "*"
    required: false
  tarBall:
    description: "Download tarball from assets"
@@ -24,6 +24,7 @@
        "jest": "^27.5.1",
        "jest-circus": "^28.1.0",
        "js-yaml": "^4.1.0",
+        "nock": "^13.2.6",
        "prettier": "2.6.2",
        "ts-jest": "^27.1.4",
        "typescript": "^4.7.2"
@@ -5551,6 +5552,12 @@
      "integrity": "sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=",
      "dev": true
    },
+    "node_modules/json-stringify-safe": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
+      "integrity": "sha512-ZClg6AaYvamvYEE82d3Iyd3vSSIjQ+odgjaTzRuO3s7toCdFKczob2i0zCh7JE8kWn17yvAWhUVxvqGwUalsRA==",
+      "dev": true
+    },
    "node_modules/json5": {
      "version": "2.2.0",
      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
@@ -5797,6 +5804,21 @@
      "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
      "dev": true
    },
+    "node_modules/nock": {
+      "version": "13.2.6",
+      "resolved": "https://registry.npmjs.org/nock/-/nock-13.2.6.tgz",
+      "integrity": "sha512-GbyeSwSEP0FYouzETZ0l/XNm5tNcDNcXJKw3LCAb+mx8bZSwg1wEEvdL0FAyg5TkBJYiWSCtw6ag4XfmBy60FA==",
+      "dev": true,
+      "dependencies": {
+        "debug": "^4.1.0",
+        "json-stringify-safe": "^5.0.1",
+        "lodash": "^4.17.21",
+        "propagate": "^2.0.0"
+      },
+      "engines": {
+        "node": ">= 10.13"
+      }
+    },
    "node_modules/node-int64": {
      "version": "0.4.0",
      "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -6154,6 +6176,15 @@
        "node": ">= 6"
      }
    },
+    "node_modules/propagate": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/propagate/-/propagate-2.0.1.tgz",
+      "integrity": "sha512-vGrhOavPSTz4QVNuBNdcNXePNdNMaO1xj9yBeH1ScQPjk/rhg9sSlCXPhMkFuaNNW/syTvYqsnbIJxMBfRbbag==",
+      "dev": true,
+      "engines": {
+        "node": ">= 8"
+      }
+    },
    "node_modules/psl": {
      "version": "1.8.0",
      "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
@@ -8613,8 +8644,7 @@
      "version": "5.3.2",
      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
-      "dev": true,
-      "requires": {}
+      "dev": true
    },
    "acorn-walk": {
      "version": "7.2.0",
@@ -9335,8 +9365,7 @@
      "version": "8.3.0",
      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.3.0.tgz",
      "integrity": "sha512-BgZuLUSeKzvlL/VUjx/Yb787VQ26RU3gGjA3iiFvdsp/2bMfVIWUVP7tjxtjS0e+HP409cPlPvNkQloz8C91ew==",
-      "dev": true,
-      "requires": {}
+      "dev": true
    },
    "eslint-import-resolver-node": {
      "version": "0.3.6",
@@ -9445,8 +9474,7 @@
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/eslint-plugin-i18n-text/-/eslint-plugin-i18n-text-1.0.1.tgz",
      "integrity": "sha512-3G3UetST6rdqhqW9SfcfzNYMpQXS7wNkJvp6dsXnjzGiku6Iu5hl3B0kmk6lIcFPwYjhQIY+tXVRtK9TlGT7RA==",
-      "dev": true,
-      "requires": {}
+      "dev": true
    },
    "eslint-plugin-import": {
      "version": "2.25.3",
@@ -11079,8 +11107,7 @@
      "version": "1.2.2",
      "resolved": "https://registry.npmjs.org/jest-pnp-resolver/-/jest-pnp-resolver-1.2.2.tgz",
      "integrity": "sha512-olV41bKSMm8BdnuMsewT4jqlZ8+3TCARAXjZGT9jcoSnrfUnRCqnMoF9XEeoWjbzObpqF9dRhHQj0Xb9QdF6/w==",
-      "dev": true,
-      "requires": {}
+      "dev": true
    },
    "jest-regex-util": {
      "version": "27.5.1",
@@ -11363,6 +11390,12 @@
      "integrity": "sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=",
      "dev": true
    },
+    "json-stringify-safe": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
+      "integrity": "sha512-ZClg6AaYvamvYEE82d3Iyd3vSSIjQ+odgjaTzRuO3s7toCdFKczob2i0zCh7JE8kWn17yvAWhUVxvqGwUalsRA==",
+      "dev": true
+    },
    "json5": {
      "version": "2.2.0",
      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
@@ -11563,6 +11596,18 @@
      "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
      "dev": true
    },
+    "nock": {
+      "version": "13.2.6",
+      "resolved": "https://registry.npmjs.org/nock/-/nock-13.2.6.tgz",
+      "integrity": "sha512-GbyeSwSEP0FYouzETZ0l/XNm5tNcDNcXJKw3LCAb+mx8bZSwg1wEEvdL0FAyg5TkBJYiWSCtw6ag4XfmBy60FA==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.0",
+        "json-stringify-safe": "^5.0.1",
+        "lodash": "^4.17.21",
+        "propagate": "^2.0.0"
+      }
+    },
    "node-int64": {
      "version": "0.4.0",
      "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -11820,6 +11865,12 @@
        "sisteransi": "^1.0.5"
      }
    },
+    "propagate": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/propagate/-/propagate-2.0.1.tgz",
+      "integrity": "sha512-vGrhOavPSTz4QVNuBNdcNXePNdNMaO1xj9yBeH1ScQPjk/rhg9sSlCXPhMkFuaNNW/syTvYqsnbIJxMBfRbbag==",
+      "dev": true
+    },
    "psl": {
      "version": "1.8.0",
      "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
@@ -12500,8 +12551,7 @@
      "version": "7.5.7",
      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.7.tgz",
      "integrity": "sha512-KMvVuFzpKBuiIXW3E4u3mySRO2/mCHSyZDJQM5NQ9Q9KHWHWh0NHgfbRMLLrceUK5qAL4ytALJbpRMjixFZh8A==",
-      "dev": true,
-      "requires": {}
+      "dev": true
    },
    "xml-name-validator": {
      "version": "3.0.0",
@@ -30,8 +30,8 @@
    "typed-rest-client": "^1.8.5"
  },
  "devDependencies": {
-    "@types/node": "^17.0.36",
    "@types/jest": "^27.4.1",
+    "@types/node": "^17.0.36",
    "@typescript-eslint/parser": "^5.27.0",
    "@vercel/ncc": "^0.33.4",
    "eslint": "^8.16.0",
@@ -40,6 +40,7 @@
    "jest": "^27.5.1",
    "jest-circus": "^28.1.0",
    "js-yaml": "^4.1.0",
+    "nock": "^13.2.6",
    "prettier": "2.6.2",
    "ts-jest": "^27.1.4",
    "typescript": "^4.7.2"
@@ -33,9 +33,4 @@ export interface IReleaseDownloadSettings {
   * Target path to download the file
   */
  outFilePath: string
-
-  /**
-   * Github access token to download from private repos (Optional)
-   */
-  token: string
 }
@@ -1,252 +0,0 @@
-import * as core from "@actions/core"
-import * as fs from "fs"
-import * as io from "@actions/io"
-import * as path from "path"
-import * as thc from "typed-rest-client/HttpClient"
-
-import {DownloadMetaData, GithubRelease} from "./gh-api"
-import {IHeaders, IHttpClientResponse} from "typed-rest-client/Interfaces"
-
-import {IReleaseDownloadSettings} from "./download-settings"
-
-const API_ROOT = "https://api.github.com/repos"
-const httpClient: thc.HttpClient = new thc.HttpClient("gh-api-client")
-
-export async function download(
-  _downloadSettings: IReleaseDownloadSettings
-): Promise<string[]> {
-  let ghRelease: GithubRelease
-
-  if (_downloadSettings.isLatest) {
-    ghRelease = await getlatestRelease(
-      _downloadSettings.sourceRepoPath,
-      _downloadSettings.token
-    )
-  } else {
-    ghRelease = await getReleaseByTag(
-      _downloadSettings.sourceRepoPath,
-      _downloadSettings.tag,
-      _downloadSettings.token
-    )
-  }
-
-  const resolvedAssets: DownloadMetaData[] = resolveAssets(
-    ghRelease,
-    _downloadSettings
-  )
-
-  return await downloadReleaseAssets(
-    resolvedAssets,
-    _downloadSettings.outFilePath,
-    _downloadSettings.token
-  )
-}
-
-/**
- * Gets the latest release metadata from github api
- * @param repoPath The source repository path. {owner}/{repo}
- */
-async function getlatestRelease(
-  repoPath: string,
-  token: string
-): Promise<GithubRelease> {
-  core.info(`Fetching latest release for repo ${repoPath}`)
-
-  const headers: IHeaders = {Accept: "application/vnd.github.v3+json"}
-  if (token !== "") {
-    headers["Authorization"] = `token ${token}`
-  }
-
-  const response = await httpClient.get(
-    `${API_ROOT}/${repoPath}/releases/latest`,
-    headers
-  )
-
-  if (response.message.statusCode !== 200) {
-    const err: Error = new Error(
-      `[getlatestRelease] Unexpected response: ${response.message.statusCode}`
-    )
-    throw err
-  }
-
-  const responseBody = await response.readBody()
-  const _release: GithubRelease = JSON.parse(responseBody.toString())
-
-  core.info(`Found latest release version: ${_release.tag_name}`)
-  return _release
-}
-
-/**
- * Gets release data of the specified tag
- * @param repoPath The source repository
- * @param tag The github tag to fetch release from.
- */
-async function getReleaseByTag(
-  repoPath: string,
-  tag: string,
-  token: string
-): Promise<GithubRelease> {
-  core.info(`Fetching release ${tag} from repo ${repoPath}`)
-
-  if (tag === "") {
-    throw new Error("Config error: Please input a valid tag")
-  }
-
-  const headers: IHeaders = {Accept: "application/vnd.github.v3+json"}
-  if (token !== "") {
-    headers["Authorization"] = `token ${token}`
-  }
-
-  const response = await httpClient.get(
-    `${API_ROOT}/${repoPath}/releases/tags/${tag}`,
-    headers
-  )
-
-  if (response.message.statusCode !== 200) {
-    const err: Error = new Error(
-      `[getReleaseByTag] Unexpected response: ${response.message.statusCode}`
-    )
-    throw err
-  }
-
-  const responseBody = await response.readBody()
-  const _release: GithubRelease = JSON.parse(responseBody.toString())
-
-  return _release
-}
-
-function resolveAssets(
-  _release: GithubRelease,
-  _settings: IReleaseDownloadSettings
-): DownloadMetaData[] {
-  const downloads: DownloadMetaData[] = []
-
-  if (_release && _release.assets.length > 0) {
-    if (_settings.fileName === "*") {
-      // Download all assets
-      for (const asset of _release.assets) {
-        const dData: DownloadMetaData = {
-          fileName: asset["name"],
-          url: asset["url"],
-          isTarBallOrZipBall: false
-        }
-        downloads.push(dData)
-      }
-    } else {
-      const asset = _release.assets.find(a => a.name === _settings.fileName)
-      if (asset) {
-        const dData: DownloadMetaData = {
-          fileName: asset["name"],
-          url: asset["url"],
-          isTarBallOrZipBall: false
-        }
-        downloads.push(dData)
-      }
-    }
-  }
-
-  if (_settings.tarBall) {
-    const fName = _settings.sourceRepoPath.split("/")[1]
-    downloads.push({
-      fileName: `${fName}-${_release.name}.tar.gz`,
-      url: _release.tarball_url,
-      isTarBallOrZipBall: true
-    })
-  }
-
-  if (_settings.zipBall) {
-    const fName = _settings.sourceRepoPath.split("/")[1]
-    downloads.push({
-      fileName: `${fName}-${_release.name}.zip`,
-      url: _release.zipball_url,
-      isTarBallOrZipBall: true
-    })
-  }
-
-  return downloads
-}
-
-/**
- * Downloads the specified assets from a given URL
- * @param dData The download metadata
- * @param out Target directory
- * @param token Personal access token to for private repos
- */
-async function downloadReleaseAssets(
-  dData: DownloadMetaData[],
-  out: string,
-  token: string
-): Promise<string[]> {
-  const outFileDir = path.resolve(out)
-
-  if (!fs.existsSync(outFileDir)) {
-    io.mkdirP(outFileDir)
-  }
-
-  const downloads: Promise<string>[] = []
-
-  for (const asset of dData) {
-    downloads.push(downloadFile(asset, out, token))
-  }
-
-  const result = await Promise.all(downloads)
-  return result
-}
-
-async function downloadFile(
-  asset: DownloadMetaData,
-  outputPath: string,
-  token: string
-): Promise<string> {
-  // Temporary fix for https://github.com/microsoft/typed-rest-client/issues/302
-  const ghClient: thc.HttpClient = new thc.HttpClient("gh-api-client", [], {
-    allowRedirects: false
-  })
-
-  const headers: IHeaders = {
-    Accept: "application/octet-stream"
-  }
-
-  if (asset.isTarBallOrZipBall) {
-    headers["Accept"] = "*/*"
-  }
-
-  if (token !== "") {
-    headers["Authorization"] = `token ${token}`
-  }
-
-  core.info(`Downloading file: ${asset.fileName} to: ${outputPath}`)
-  const response = await ghClient.get(asset.url, headers)
-
-  if (response.message.statusCode === 200) {
-    return saveFile(outputPath, asset.fileName, response)
-  } else if (response.message.statusCode === 302) {
-    delete headers["Authorization"]
-    const assetLocation = response.message.headers.location as string
-    const assetResponse = await ghClient.get(assetLocation, headers)
-    return saveFile(outputPath, asset.fileName, assetResponse)
-  } else {
-    const err: Error = new Error(
-      `Unexpected response: ${response.message.statusCode}`
-    )
-    throw err
-  }
-}
-
-async function saveFile(
-  outputPath: string,
-  fileName: string,
-  httpClientResponse: IHttpClientResponse
-): Promise<string> {
-  const outFilePath: string = path.resolve(outputPath, fileName)
-  const fileStream: fs.WriteStream = fs.createWriteStream(outFilePath)
-
-  return new Promise((resolve, reject) => {
-    fileStream.on("error", err => reject(err))
-    const outStream = httpClientResponse.message.pipe(fileStream)
-
-    outStream.on("close", () => {
-      resolve(outFilePath)
-    })
-  })
-}
@@ -1,5 +1,6 @@
 import * as core from "@actions/core"
 import * as path from "path"
+
 import {IReleaseDownloadSettings} from "./download-settings"

 export function getInputs(): IReleaseDownloadSettings {
@@ -42,7 +43,5 @@ export function getInputs(): IReleaseDownloadSettings {
  const outFilePath = core.getInput("out-file-path") || "."
  downloadSettings.outFilePath = path.resolve(githubWorkspacePath, outFilePath)

-  downloadSettings.token = core.getInput("token")
-
  return downloadSettings
 }
@@ -1,13 +1,26 @@
 import * as core from "@actions/core"
+import * as handlers from "typed-rest-client/Handlers"
 import * as inputHelper from "./input-helper"
+import * as thc from "typed-rest-client/HttpClient"

-import {download} from "./download"
+import {ReleaseDownloader} from "./release-downloader"

 async function run(): Promise<void> {
  try {
    const downloadSettings = inputHelper.getInputs()
+    const authToken = core.getInput("token")

-    const res: string[] = await download(downloadSettings)
+    const credentialHandler = new handlers.BearerCredentialHandler(
+      authToken,
+      false
+    )
+    const httpClient: thc.HttpClient = new thc.HttpClient("gh-api-client", [
+      credentialHandler
+    ])
+
+    const downloader = new ReleaseDownloader(httpClient)
+
+    const res: string[] = await downloader.download(downloadSettings)
    core.info(`Done: ${res}`)
  } catch (error) {
    if (error instanceof Error) {
@@ -0,0 +1,230 @@
+import * as core from "@actions/core"
+import * as fs from "fs"
+import * as io from "@actions/io"
+import * as path from "path"
+import * as thc from "typed-rest-client/HttpClient"
+
+import {DownloadMetaData, GithubRelease} from "./gh-api"
+import {IHeaders, IHttpClientResponse} from "typed-rest-client/Interfaces"
+
+import {IReleaseDownloadSettings} from "./download-settings"
+
+export class ReleaseDownloader {
+  private httpClient: thc.HttpClient
+
+  private _apiRoot = "https://api.github.com/repos"
+
+  constructor(httpClient: thc.HttpClient) {
+    this.httpClient = httpClient
+  }
+
+  async download(
+    downloadSettings: IReleaseDownloadSettings
+  ): Promise<string[]> {
+    let ghRelease: GithubRelease
+
+    if (downloadSettings.isLatest) {
+      ghRelease = await this.getlatestRelease(downloadSettings.sourceRepoPath)
+    } else {
+      ghRelease = await this.getReleaseByTag(
+        downloadSettings.sourceRepoPath,
+        downloadSettings.tag
+      )
+    }
+
+    const resolvedAssets: DownloadMetaData[] = this.resolveAssets(
+      ghRelease,
+      downloadSettings
+    )
+
+    return await this.downloadReleaseAssets(
+      resolvedAssets,
+      downloadSettings.outFilePath
+    )
+  }
+
+  /**
+   * Gets the latest release metadata from github api
+   * @param repoPath The source repository path. {owner}/{repo}
+   */
+  private async getlatestRelease(repoPath: string): Promise<GithubRelease> {
+    core.info(`Fetching latest release for repo ${repoPath}`)
+
+    const headers: IHeaders = {Accept: "application/vnd.github.v3+json"}
+
+    const response = await this.httpClient.get(
+      `${this._apiRoot}/${repoPath}/releases/latest`,
+      headers
+    )
+
+    if (response.message.statusCode !== 200) {
+      const err: Error = new Error(
+        `[getlatestRelease] Unexpected response: ${response.message.statusCode}`
+      )
+      throw err
+    }
+
+    const responseBody = await response.readBody()
+    const release: GithubRelease = JSON.parse(responseBody.toString())
+
+    core.info(`Found latest release version: ${release.tag_name}`)
+    return release
+  }
+
+  /**
+   * Gets release data of the specified tag
+   * @param repoPath The source repository
+   * @param tag The github tag to fetch release from.
+   */
+  private async getReleaseByTag(
+    repoPath: string,
+    tag: string
+  ): Promise<GithubRelease> {
+    core.info(`Fetching release ${tag} from repo ${repoPath}`)
+
+    if (tag === "") {
+      throw new Error("Config error: Please input a valid tag")
+    }
+
+    const headers: IHeaders = {Accept: "application/vnd.github.v3+json"}
+
+    const response = await this.httpClient.get(
+      `${this._apiRoot}/${repoPath}/releases/tags/${tag}`,
+      headers
+    )
+
+    if (response.message.statusCode !== 200) {
+      const err: Error = new Error(
+        `[getReleaseByTag] Unexpected response: ${response.message.statusCode}`
+      )
+      throw err
+    }
+
+    const responseBody = await response.readBody()
+    const release: GithubRelease = JSON.parse(responseBody.toString())
+    core.info(`Found release tag: ${release.tag_name}`)
+
+    return release
+  }
+
+  private resolveAssets(
+    ghRelease: GithubRelease,
+    downloadSettings: IReleaseDownloadSettings
+  ): DownloadMetaData[] {
+    const downloads: DownloadMetaData[] = []
+
+    if (ghRelease && ghRelease.assets.length > 0) {
+      if (downloadSettings.fileName === "*") {
+        // Download all assets
+        for (const asset of ghRelease.assets) {
+          const dData: DownloadMetaData = {
+            fileName: asset["name"],
+            url: asset["url"],
+            isTarBallOrZipBall: false
+          }
+          downloads.push(dData)
+        }
+      } else {
+        const asset = ghRelease.assets.find(
+          a => a.name === downloadSettings.fileName
+        )
+        if (asset) {
+          const dData: DownloadMetaData = {
+            fileName: asset["name"],
+            url: asset["url"],
+            isTarBallOrZipBall: false
+          }
+          downloads.push(dData)
+        }
+      }
+    }
+
+    if (downloadSettings.tarBall) {
+      const fName = downloadSettings.sourceRepoPath.split("/")[1]
+      downloads.push({
+        fileName: `${fName}-${ghRelease.name}.tar.gz`,
+        url: ghRelease.tarball_url,
+        isTarBallOrZipBall: true
+      })
+    }
+
+    if (downloadSettings.zipBall) {
+      const fName = downloadSettings.sourceRepoPath.split("/")[1]
+      downloads.push({
+        fileName: `${fName}-${ghRelease.name}.zip`,
+        url: ghRelease.zipball_url,
+        isTarBallOrZipBall: true
+      })
+    }
+
+    return downloads
+  }
+
+  /**
+   * Downloads the specified assets from a given URL
+   * @param dData The download metadata
+   * @param out Target directory
+   */
+  private async downloadReleaseAssets(
+    dData: DownloadMetaData[],
+    out: string
+  ): Promise<string[]> {
+    const outFileDir = path.resolve(out)
+
+    if (!fs.existsSync(outFileDir)) {
+      io.mkdirP(outFileDir)
+    }
+
+    const downloads: Promise<string>[] = []
+
+    for (const asset of dData) {
+      downloads.push(this.downloadFile(asset, out))
+    }
+
+    const result = await Promise.all(downloads)
+    return result
+  }
+
+  private async downloadFile(
+    asset: DownloadMetaData,
+    outputPath: string
+  ): Promise<string> {
+    const headers: IHeaders = {
+      Accept: "application/octet-stream"
+    }
+
+    if (asset.isTarBallOrZipBall) {
+      headers["Accept"] = "*/*"
+    }
+
+    core.info(`Downloading file: ${asset.fileName} to: ${outputPath}`)
+    const response = await this.httpClient.get(asset.url, headers)
+
+    if (response.message.statusCode === 200) {
+      return this.saveFile(outputPath, asset.fileName, response)
+    } else {
+      const err: Error = new Error(
+        `Unexpected response: ${response.message.statusCode}`
+      )
+      throw err
+    }
+  }
+
+  private async saveFile(
+    outputPath: string,
+    fileName: string,
+    httpClientResponse: IHttpClientResponse
+  ): Promise<string> {
+    const outFilePath: string = path.resolve(outputPath, fileName)
+    const fileStream: fs.WriteStream = fs.createWriteStream(outFilePath)
+
+    return new Promise((resolve, reject) => {
+      fileStream.on("error", err => reject(err))
+      const outStream = httpClientResponse.message.pipe(fileStream)
+
+      outStream.on("close", () => {
+        resolve(outFilePath)
+      })
+    })
+  }
+}
				`@@ -0,0 +1 @@`
				`v1.0 robinraju/probable-potato/releases/latest`