1 files changed, 47 insertions, 0 deletions

diff --git a/editors/code/src/installation/fetch_latest_artifact_metadata.ts b/editors/code/src/installation/fetch_latest_artifact_metadata.ts
new file mode 100644
index 000000000..f07431aac
--- /dev/null
+++ b/editors/code/src/installation/fetch_latest_artifact_metadata.ts
@@ -0,0 +1,47 @@
+import fetch from "node-fetch";
+import { GithubRepo, ArtifactMetadata } from "./interfaces";
+
+const GITHUB_API_ENDPOINT_URL = "https://api.github.com";
+
+export interface FetchLatestArtifactMetadataOpts {
+    repo: GithubRepo;
+    artifactFileName: string;
+}
+
+export async function fetchLatestArtifactMetadata(
+    opts: FetchLatestArtifactMetadataOpts
+): Promise<null | ArtifactMetadata> {
+
+    const repoOwner = encodeURIComponent(opts.repo.owner);
+    const repoName  = encodeURIComponent(opts.repo.name);
+
+    const apiEndpointPath = `/repos/${repoOwner}/${repoName}/releases/latest`;
+    const requestUrl = GITHUB_API_ENDPOINT_URL + apiEndpointPath;
+
+    // We skip runtime type checks for simplicity (here we cast from `any` to `Release`)
+
+    const response: GithubRelease = await fetch(requestUrl, {
+            headers: { Accept: "application/vnd.github.v3+json" }
+        })
+        .then(res => res.json());
+
+    const artifact = response.assets.find(artifact => artifact.name === opts.artifactFileName);
+
+    return !artifact ? null : {
+        releaseName: response.name,
+        downloadUrl: artifact.browser_download_url
+    };
+
+    // Noise denotes tremendous amount of data that we are not using here
+    interface GithubRelease {
+        name: string;
+        assets: Array<{
+            browser_download_url: string;
+
+            [noise: string]: unknown;
+        }>;
+
+        [noise: string]: unknown;
+    }
+
+}