Add extend method in provider prototype

Signed-off-by: Alexandre Bodin <bodin.alex@gmail.com>

examples/getstarted/config/functions/bootstrap.js

@@ -1,5 +1,8 @@
 'use strict';
 
+const fse = require('fs-extra');
+const { join } = require('path');
+
 /**
  * An asynchronous bootstrap function that runs before
  * your application gets started.
@@ -8,4 +11,17 @@
  * run jobs, or perform some special logic.
  */
 
-module.exports = () => {};
+module.exports = async () => {
+  await fse.ensureDir('./public/uploads/sub-folder');
+
+  // example of overriding the upload provider
+  strapi.plugins.upload.provider.extend({
+    async upload(file) {
+      const filePath = `/uploads/sub-folder/${file.hash}${file.ext}`;
+
+      // write file in public/assets folder
+      await fse.writeFile(join(strapi.config.public.path, filePath), file.buffer);
+      file.url = filePath;
+    },
+  });
+};

packages/strapi-plugin-upload/config/functions/bootstrap.js

@@ -30,7 +30,9 @@ module.exports = async () => {
 
 const createProvider = ({ provider, providerOptions }) => {
   try {
-    return require(`strapi-provider-upload-${provider}`).init(providerOptions);
+    const providerInstance = require(`strapi-provider-upload-${provider}`).init(providerOptions);
+
+    return Object.assign(Object.create(baseProvider), providerInstance);
   } catch (err) {
     strapi.log.error(err);
     throw new Error(
@@ -38,3 +40,15 @@ const createProvider = ({ provider, providerOptions }) => {
     );
   }
 };
+
+const baseProvider = {
+  extend(obj) {
+    Object.assign(this, obj);
+  },
+  upload() {
+    throw new Error('Provider upload method is not implemented');
+  },
+  delete() {
+    throw new Error('Provider delete method is not implemented');
+  },
+};