feat: implement (optional) semver parsing of version (#213)

src/github.ts

@@ -1,4 +1,6 @@
 import * as httpm from '@actions/http-client';
+import * as core from '@actions/core';
+import * as semver from 'semver';
 
 export interface GitHubRelease {
   id: number;
@@ -6,7 +8,36 @@ export interface GitHubRelease {
 }
 
 export const getRelease = async (version: string): Promise<GitHubRelease | null> => {
-  const url: string = `https://github.com/goreleaser/goreleaser/releases/${version}`;
+  const resolvedVersion: string = (await resolveVersion(version)) || version;
+  const url: string = `https://github.com/goreleaser/goreleaser/releases/${resolvedVersion}`;
   const http: httpm.HttpClient = new httpm.HttpClient('goreleaser-action');
   return (await http.getJson<GitHubRelease>(url)).result;
 };
+
+const resolveVersion = async (version: string): Promise<string | null> => {
+  const allTags: Array<string> | null = await getAllTags();
+  if (!allTags) {
+    throw new Error(`Cannot find GoReleaser tags`);
+  }
+  core.debug(`Found ${allTags.length} tags in total`);
+
+  return semver.maxSatisfying(allTags, version);
+};
+
+interface GitHubTag {
+  tag_name: string;
+}
+
+const getAllTags = async (): Promise<Array<string>> => {
+  const http: httpm.HttpClient = new httpm.HttpClient('goreleaser-action');
+  const url: string = `https://goreleaser.com/static/releases.json`;
+  const getTags = http.getJson<Array<GitHubTag>>(url);
+
+  return getTags.then(response => {
+    if (response.result == null) {
+      return [];
+    }
+
+    return response.result.map(obj => obj.tag_name);
+  });
+};