Allow to templatize schedule tag (#1)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

src/context.ts

@@ -4,6 +4,7 @@ export interface Inputs {
   images: string[];
   tagSha: boolean;
   tagEdge: string;
+  tagSchedule: string;
   sepTags: string;
   sepLabels: string;
   githubToken: string;
@@ -14,6 +15,7 @@ export function getInputs(): Inputs {
     images: getInputList('images'),
     tagSha: /true/i.test(core.getInput('tag-sha')),
     tagEdge: core.getInput('tag-edge'),
+    tagSchedule: core.getInput('tag-schedule') || 'nightly',
     sepTags: core.getInput('sep-tags') || `\n`,
     sepLabels: core.getInput('sep-labels') || `\n`,
     githubToken: core.getInput('github-token')

src/main.ts

@@ -31,7 +31,7 @@ async function run() {
     core.startGroup(`Docker image version`);
     core.info(`${version}`);
     core.endGroup();
-    core.setOutput('version', version);
+    core.setOutput('version', version || '');
 
     const tags: Array<string> = meta.tags();
     core.startGroup(`Docker tags`);

src/meta.ts

@@ -1,3 +1,5 @@
+import * as handlebars from 'handlebars';
+import * as moment from 'moment';
 import * as semver from 'semver';
 import {Inputs} from './context';
 import * as core from '@actions/core';
@@ -8,6 +10,7 @@ export class Meta {
   private readonly inputs: Inputs;
   private readonly context: Context;
   private readonly repo: ReposGetResponseData;
+  private readonly date: Date;
 
   constructor(inputs: Inputs, context: Context, repo: ReposGetResponseData) {
     this.inputs = inputs;
@@ -16,11 +19,12 @@ export class Meta {
     }
     this.context = context;
     this.repo = repo;
+    this.date = new Date();
   }
 
   public version(): string | undefined {
     if (/schedule/.test(this.context.eventName)) {
-      return 'nightly';
+      return handlebars.compile(this.inputs.tagSchedule)(this.scheduleTplContext());
     } else if (/^refs\/tags\//.test(this.context.ref)) {
       const tag = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
       const sver = semver.clean(tag);
@@ -38,7 +42,7 @@ export class Meta {
     let tags: Array<string> = [];
     for (const image of this.inputs.images) {
       if (/schedule/.test(this.context.eventName)) {
-        tags.push.apply(tags, Meta.eventSchedule(image));
+        tags.push.apply(tags, this.eventSchedule(image));
       } else if (/^refs\/tags\//.test(this.context.ref)) {
         tags.push.apply(tags, this.eventTag(image));
       } else if (/^refs\/heads\//.test(this.context.ref)) {
@@ -62,14 +66,15 @@ export class Meta {
       `org.opencontainers.image.url=${this.repo.html_url || ''}`,
       `org.opencontainers.image.source=${this.repo.clone_url || ''}`,
       `org.opencontainers.image.version=${this.version() || ''}`,
-      `org.opencontainers.image.created=${new Date().toISOString()}`,
+      `org.opencontainers.image.created=${this.date.toISOString()}`,
       `org.opencontainers.image.revision=${this.context.sha || ''}`,
       `org.opencontainers.image.licenses=${this.repo.license?.spdx_id || ''}`
     ];
   }
 
-  private static eventSchedule(image: string): Array<string> {
-    return [`${image}:nightly`];
+  private eventSchedule(image: string): Array<string> {
+    const schedule = handlebars.compile(this.inputs.tagSchedule)(this.scheduleTplContext());
+    return [`${image}:${schedule}`];
   }
 
   private eventTag(image: string): Array<string> {
@@ -93,4 +98,13 @@ export class Meta {
     const pr = this.context.ref.replace(/^refs\/pull\//g, '').replace(/\/merge$/g, '');
     return [`${image}:pr-${pr}`];
   }
+
+  private scheduleTplContext(): any {
+    const currentDate = this.date;
+    return {
+      date: function (format) {
+        return moment(currentDate).utc().format(format);
+      }
+    };
+  }
 }