✨ Supported dynamic image resizing for LocalFileStorage(#10184)

refs #10181 

* Added initial handleImageSizes middleware

* Implemented saveRaw method on local file storage

* Wired up handleImageSizes middleware

* Implemented delete for LocalFileStorage

* Removed delete method from theme Storage class

* Deleted sizes directory when theme is activated

* Ensured that smaller images are not enlarged

* Renamed sizes -> size

* Exited middleware as early as possible

* Called getStorage as late as possible

* Updated image sizes middleware to handle dimension paths

* Revert "Deleted sizes directory when theme is activated"

This reverts commit 9204dfcc73a6a79d597dbf23651817bcbfc59991.

* Revert "Removed delete method from theme Storage class"

This reverts commit b45fdb405a05faeaf4bd87e977c4ac64ff96b057.

* Revert "Implemented delete for LocalFileStorage"

This reverts commit a587cd6bae45b68a293b2d5cfd9b7705a29e7bfa.

* Fixed typo

Co-Authored-By: allouis <[email protected]>

* Redirected to original image if no image_sizes config

* Refactored redirection because rule of three

* Updated comments

* Added rubbish tests

* Added @todo comment for handleImageSizes tests

* Added safeResizeImage method to image manipulator

* Used image manipulator lib in image_size middleware

ghost/image-transform/lib/transform.js

@@ -61,4 +61,27 @@ const process = (options = {}) => {
         });
 };
 
+const resizeImage = (originalBuffer, {width, height} = {}) => {
+    const sharp = require('sharp');
+    return sharp(originalBuffer)
+        .resize(width, height, {
+            // CASE: dont make the image bigger than it was
+            withoutEnlargement: true
+        })
+        // CASE: Automatically remove metadata and rotate based on the orientation.
+        .rotate()
+        .toBuffer()
+        .then((resizedBuffer) => {
+            return resizedBuffer.length < originalBuffer.length ? resizedBuffer : originalBuffer;
+        });
+};
+
 module.exports.process = process;
+module.exports.safeResizeImage = (buffer, options) => {
+    try {
+        require('sharp');
+        return resizeImage(buffer, options);
+    } catch (e) {
+        return Promise.resolve(buffer);
+    }
+};