From 48f537d6d0f72b88bff65151ba5129e46b1f87c8 Mon Sep 17 00:00:00 2001
From: Michele Locati <michele@locati.it>
Date: Fri, 30 Oct 2020 11:15:26 +0100
Subject: [PATCH] Allow installing a specific Composer version

---
 __tests__/tools.test.ts | 9 +++++++++
 dist/index.js           | 4 ++++
 src/tools.ts            | 6 ++++++
 3 files changed, 19 insertions(+)

diff --git a/__tests__/tools.test.ts b/__tests__/tools.test.ts
index 36360496..9f512a9f 100644
--- a/__tests__/tools.test.ts
+++ b/__tests__/tools.test.ts
@@ -285,6 +285,15 @@ describe('Tools tests', () => {
     expect(await tools.getComposerUrl('2')).toContain(
       'https://getcomposer.org/composer-2.phar'
     );
+    expect(await tools.getComposerUrl('1.7.2')).toContain(
+      'https://github.com/composer/composer/releases/download/1.7.2/composer.phar'
+    );
+    expect(await tools.getComposerUrl('2.0.0-RC2')).toContain(
+      'https://github.com/composer/composer/releases/download/2.0.0-RC2/composer.phar'
+    );
+    expect(await tools.getComposerUrl('wrong')).toContain(
+      'https://getcomposer.org/composer-stable.phar'
+    );
   });
 
   it('checking getSymfonyUri', async () => {
diff --git a/dist/index.js b/dist/index.js
index 96c74204..d94e575f 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1930,6 +1930,10 @@ async function getComposerUrl(version) {
         case '2':
             return (cache_url + 'https://getcomposer.org/composer-' + version + '.phar');
         default:
+            if (/^\d+\.\d+\.\d+[\w-]*$/.test(version)) {
+                return (cache_url +
+                    `https://github.com/composer/composer/releases/download/${version}/composer.phar`);
+            }
             return cache_url + 'https://getcomposer.org/composer-stable.phar';
     }
 }
diff --git a/src/tools.ts b/src/tools.ts
index d39baf0c..c63e3dbe 100644
--- a/src/tools.ts
+++ b/src/tools.ts
@@ -321,6 +321,12 @@ export async function getComposerUrl(version: string): Promise<string> {
         cache_url + 'https://getcomposer.org/composer-' + version + '.phar'
       );
     default:
+      if (/^\d+\.\d+\.\d+[\w-]*$/.test(version)) {
+        return (
+          cache_url +
+          `https://github.com/composer/composer/releases/download/${version}/composer.phar`
+        );
+      }
       return cache_url + 'https://getcomposer.org/composer-stable.phar';
   }
 }