Add sideload build step

Author: davidknise

gulpfile.js

@@ -1,5 +1,9 @@
+const { execSync } = require('child_process');
+const fs = require('fs');
 const gulp = require('gulp');
 const shell = require('gulp-shell');
+const path = reuqire('path');
+const process = reuqire('process');
 const ts = require('gulp-typescript');
 
 const tsProject = ts.createProject('tsconfig.json');
@@ -10,15 +14,86 @@ function clean(cb) {
         .then(() => cb());
 }
 
+function sideload(cb) {
+    if (process.env.SECURITY_DEVOPS_ACTION_BUILD_SIDELOAD === 'true') {
+        console.log('Sideload mode enabled. Linking @microsoft/security-devops-actions-toolkit');
+
+        const toolkitSrcDir = path.resolve(path.join(__dirname, '..', 'security-devops-actions-toolkit'));
+
+        if (!fs.existsSync(toolkitSrcDir)) {
+            throw new Error(`Could not the toolkit repo directory: ${toolkitSrcDir}. Please clone the repo to a parallel directory to this extension repo. Repo homepage: https://github.com/microsoft/security-devops-actions-toolkit`);
+        }
+
+        const toolkitNodeModulesDir = path.join(__dirname, 'node_modules', '@microsoft', 'security-devops-actions-toolkit');
+
+        if (!fs.existsSync(toolkitNodeModulesDir)) {
+            throw new Error(`The node_modules directory for the toolkit does not exist. please run npm install before continuing: ${toolkitNodeModulesDir}`);
+        }
+
+        if (process.env.SECURITY_DEVOPS_ACTION_BUILD_SIDELOAD_BUILD === 'true') {
+            console.log('Building sideload project: npm run build');
+            const output = execSync('npm run build', { cwd: toolkitSrcDir, encoding: 'utf8' });
+            console.log(output);
+        }
+
+        console.log(`Clearing the existing toolkit directory: ${toolkitNodeModulesDir}`);
+        clearDir(toolkitNodeModulesDir);
+
+        console.log("Copying sideload build...");
+        copyFiles(toolkitSrcDir, toolkitNodeModulesDir);
+
+        fs.writeFileSync(
+            path.join(toolkitNodeModulesDir, '.sideloaded'),
+            'This package was built and sideloaded by the security-devops-action build process. Do not commit this file to source control.');
+    }
+    cb();
+}
+
 function compile(cb) {
     tsProject
         .src()
         .pipe(tsProject()).js
-        .pipe(gulp.dest('lib'));
-    cb();
+        .pipe(gulp.dest('lib'))
+        .on('end', () => cb());
 }
 
+function clearDir(dir) {
+    // Get a list of files and subdirectories in the directory
+    const items = fs.readdirSync(directoryPath);
+
+    for (const item of items) {
+        const itemPath = path.join(directoryPath, item);
+
+        if (fs.statSync(itemPath).isFile()) {
+            fs.unlinkSync(itemPath);
+        } else {
+            clearDir(itemPath);
+        }
+    }
+
+    // Finally, remove the empty directory
+    fs.rmdirSync(directoryPath);
+}
+
+function copyFiles(srcDir, destDir) {
+    if (!fs.existsSync(destDir)) {
+        fs.mkdirSync(destDir, { recursive: true });
+    }
+  
+    fs.readdirSync(srcDir).forEach((file) => {
+        const srcFilePath = path.join(srcDir, file);
+        const destFilePath = path.join(destDir, file);
+    
+        if (fs.statSync(srcFilePath).isDirectory()) {
+            copyFiles(srcFilePath, destFilePath);
+        } else {
+            fs.copyFileSync(srcFilePath, destFilePath);
+            console.log(`Copied ${srcFilePath} to ${destFilePath}`);
+        }
+    });
+  }
+
 exports.clean = clean;
 exports.compile = compile;
-exports.build = gulp.series(clean, compile);
+exports.build = gulp.series(clean, sideload, compile);
 exports.default = exports.build;