check if image is faulty in enhanceFile

packages/core/upload/server/services/image-manipulation.js

@@ -4,11 +4,10 @@
  */
 const fs = require('fs');
 const { join } = require('path');
-const { ApplicationError } = require('@strapi/utils').errors;
 const sharp = require('sharp');
 
 const { getService } = require('../utils');
-const { bytesToKbytes } = require('../utils/file');
+const { bytesToKbytes, writableStreamDiscard } = require('../utils/file');
 
 const FORMATS_TO_PROCESS = ['jpeg', 'png', 'webp', 'tiff', 'svg', 'gif'];
 const FORMATS_TO_OPTIMIZE = ['jpeg', 'png', 'webp', 'tiff'];
@@ -47,12 +46,7 @@ const THUMBNAIL_RESIZE_OPTIONS = {
 const resizeFileTo = async (file, options, { name, hash }) => {
   const filePath = join(file.tmpWorkingDirectory, hash);
 
-  try {
   await writeStreamToFile(file.getStream().pipe(sharp().resize(options)), filePath);
-  } catch (err) {
-    throw new ApplicationError('File is not a valid image');
-  }
-
   const newFile = {
     name,
     hash,
@@ -108,11 +102,7 @@ const optimize = async file => {
     }
     const filePath = join(file.tmpWorkingDirectory, `optimized-${file.hash}`);
 
-    try {
     await writeStreamToFile(file.getStream().pipe(transformer), filePath);
-    } catch {
-      throw new ApplicationError('File is not a valid image');
-    }
 
     newFile.getStream = () => fs.createReadStream(filePath);
   }
@@ -190,6 +180,20 @@ const isSupportedImage = (...args) => {
   return isOptimizableImage(...args);
 };
 
+/**
+ *  Applies a simple image transformation to see if the image is faulty/corrupted.
+ */
+const isFaultyImage = file =>
+  new Promise(resolve => {
+    file
+      .getStream()
+      .pipe(sharp().rotate())
+      .on('error', () => resolve(true))
+      .pipe(writableStreamDiscard())
+      .on('error', () => resolve(true))
+      .on('close', () => resolve(false));
+  });
+
 const isOptimizableImage = async file => {
   let format;
   try {
@@ -216,6 +220,7 @@ const isImage = async file => {
 
 module.exports = () => ({
   isSupportedImage,
+  isFaultyImage,
   isOptimizableImage,
   isImage,
   getDimensions,

packages/core/upload/server/services/upload.js

@@ -22,6 +22,7 @@ const { NotFoundError } = require('@strapi/utils').errors;
 
 const { MEDIA_UPDATE, MEDIA_CREATE, MEDIA_DELETE } = webhookUtils.webhookEvents;
 
+const { ApplicationError } = require('@strapi/utils/lib/errors');
 const { FILE_MODEL_UID } = require('../constants');
 const { getService } = require('../utils');
 const { bytesToKbytes } = require('../utils/file');
@@ -106,7 +107,7 @@ module.exports = ({ strapi }) => ({
     return entity;
   },
 
-  async enhanceFile(file, fileInfo = {}, metas = {}) {
+  async enhanceAndValidateFile(file, fileInfo = {}, metas = {}) {
     const currentFile = await this.formatFileInfo(
       {
         filename: file.name,
@@ -121,14 +122,29 @@ module.exports = ({ strapi }) => ({
     );
     currentFile.getStream = () => fs.createReadStream(file.path);
 
-    const { optimize, isOptimizableImage } = strapi.plugin('upload').service('image-manipulation');
+    const { optimize, isImage, isFaultyImage, isOptimizableImage } = strapi
+      .plugin('upload')
+      .service('image-manipulation');
 
+    if (await isImage(currentFile)) {
+      if (await isFaultyImage(currentFile)) {
+        throw new ApplicationError('File is not a valid image');
+      }
       if (!(await isOptimizableImage(currentFile))) {
         return currentFile;
       }
+    }
     return optimize(currentFile);
   },
 
+  // TODO V5: remove enhanceFile
+  async enhanceFile(file, fileInfo = {}, metas = {}) {
+    process.emitWarning(
+      '[deprecated] In future versions, `enhanceFile` will be removed. Replace it with `enhanceAndValidateFile` instead.'
+    );
+    return this.enhanceAndValidateFile(file, fileInfo, metas);
+  },
+
   async upload({ data, files }, { user } = {}) {
     // create temporary folder to store files for stream manipulation
     const tmpWorkingDirectory = await createAndAssignTmpWorkingDirectoryToFiles(files);
@@ -142,7 +158,7 @@ module.exports = ({ strapi }) => ({
       const fileInfoArray = Array.isArray(fileInfo) ? fileInfo : [fileInfo];
 
       const doUpload = async (file, fileInfo) => {
-        const fileData = await this.enhanceFile(file, fileInfo, metas);
+        const fileData = await this.enhanceAndValidateFile(file, fileInfo, metas);
         return this.uploadFileAndPersist(fileData, { user });
       };
 
@@ -266,7 +282,7 @@ module.exports = ({ strapi }) => ({
 
     try {
       const { fileInfo } = data;
-      fileData = await this.enhanceFile(file, fileInfo);
+      fileData = await this.enhanceAndValidateFile(file, fileInfo);
 
       // keep a constant hash and extension so the file url doesn't change when the file is replaced
       _.assign(fileData, {
@@ -386,7 +402,7 @@ module.exports = ({ strapi }) => ({
     try {
       const enhancedFiles = await Promise.all(
         arr.map(file => {
-          return this.enhanceFile(
+          return this.enhanceAndValidateFile(
             file,
             { folder: apiUploadFolder.id },
             {

packages/core/upload/server/utils/file.js

@@ -2,6 +2,7 @@
 /**
  * Utils file containing file treatment utils
  */
+const { Writable } = require('stream');
 
 const bytesToKbytes = bytes => Math.round((bytes / 1000) * 100) / 100;
 
@@ -26,8 +27,22 @@ const getStreamSize = stream =>
     stream.resume();
   });
 
+/**
+ * Create a writeable Node.js stream that discards received data.
+ * Useful for testing, draining a stream of data, etc.
+ */
+function writableStreamDiscard(options) {
+  return new Writable({
+    ...options,
+    write(chunk, encding, callback) {
+      setImmediate(callback);
+    },
+  });
+}
+
 module.exports = {
   streamToBuffer,
   bytesToKbytes,
   getStreamSize,
+  writableStreamDiscardData: writableStreamDiscard,
 };