V2 Download Artifact (#27)

* V2 Preview (#19)

* V2 Setup

* Add end-to-end tests

* Update tests

* Update tests

* Update tests

* Update tests again

* Misc Updates

* Improve logs

* Update release

* Update README.md

* @actions/artifact v0.2.0

* Update to the latest version of the @actions/artifact package

* Update @actions/artifact to 0.3.1

* Misc Updates

* Add .gitattributes

* Update Readme

* Update test YAML

src/constants.ts

@@ -0,0 +1,4 @@
+export enum Inputs {
+  Name = 'name',
+  Path = 'path'
+}

src/download-artifact.ts

@@ -0,0 +1,40 @@
+import * as core from '@actions/core'
+import * as artifact from '@actions/artifact'
+import {Inputs} from './constants'
+
+async function run(): Promise<void> {
+  try {
+    const name = core.getInput(Inputs.Name, {required: false})
+    const path = core.getInput(Inputs.Path, {required: false})
+
+    const artifactClient = artifact.create()
+    if (!name) {
+      // download all artifacts
+      const downloadResponse = await artifactClient.downloadAllArtifacts(path)
+      core.info(`There were ${downloadResponse.length} artifacts downloaded`)
+      for (const artifact of downloadResponse) {
+        core.info(
+          `Artifact ${artifact.artifactName} was downloaded to ${artifact.downloadPath}`
+        )
+      }
+    } else {
+      // download a single artifact
+      const downloadOptions = {
+        createArtifactFolder: false
+      }
+      const downloadResponse = await artifactClient.downloadArtifact(
+        name,
+        path,
+        downloadOptions
+      )
+      core.info(
+        `Artifact ${downloadResponse.artifactName} was downloaded to ${downloadResponse.downloadPath}`
+      )
+    }
+    core.info('Artifact download has finished successfully')
+  } catch (err) {
+    core.setFailed(err.message)
+  }
+}
+
+run()