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resize.js
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resize.js
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// Create asset of resized images in file store
//
// - src - buffer|path|stream
//
// - options
// - store - storage interface
// - ext - file extension
// - date - timestamp for generated objectid
// - maxSize - maximum file size if resized images
// - resize
// - orig
// - width
// - height
// - max_width
// - max_height
// - jpeg_quality
// - skip_size
// - sm
// - ...
//
// Returns Promise:
//
// {
// id: ObjectId,
// size: Number,
// images: { orig: { width: Number , height: Number } }
// }
//
'use strict';
const _ = require('lodash');
const { readFile } = require('fs/promises');
const mime = require('mime-types').lookup;
const Mongoose = require('mongoose');
const sharp = require('sharp');
const image_traverse = require('image-blob-reduce/lib/image_traverse.js');
const resize_outline = require('nodeca.users/lib/resize_outline');
// Limit amount of threads used for each image
// sharp.concurrency(1);
// Create preview for image
//
// - path - Image file path.
// - resizeConfig
// - width
// - height
// - max_width
// - max_height
// - jpeg_quality
// - gif_animation
// - skip_size
// - imageType - gif, jpeg, png, etc
//
async function createPreview(image, resizeConfig, imageType) {
// To scale image, we calculate new width and height,
// resize image by height, and crop by width
let saveAsIs = false;
let u = resize_outline(image.width, image.height, resizeConfig);
let scaledWidth = u.crop_width;
let scaledHeight = u.crop_height;
let outType = resizeConfig.type || imageType;
if (imageType === outType) {
// If image size is smaller than 'skip_size', skip resizing;
// this saves image as is, including metadata like EXIF
//
if (resizeConfig.skip_size && image.length < resizeConfig.skip_size) {
saveAsIs = true;
}
// If image is smaller than needed already, save it as is
//
if (scaledWidth >= image.width && scaledHeight >= image.height) {
if (!resizeConfig.max_size || image.length < resizeConfig.max_size) {
saveAsIs = true;
}
}
}
// Do not repack small non-jpeg images,
// we always process jpegs to fix orientation
//
if (saveAsIs && imageType !== 'jpeg') {
return { image, type: imageType };
}
let sharpInstance = sharp(image.buffer);
let formatOptions = {};
if (outType === 'jpeg') {
// Set quality for jpeg image (default sharp quality is 80)
formatOptions.quality = resizeConfig.jpeg_quality;
// Rotate image / fix Exif orientation
sharpInstance.rotate();
// Jpeg doesn't support alpha channel, so substitute it with white background
if (imageType === 'gif' || imageType === 'png') {
sharpInstance.flatten({ background: 'white' });
}
}
if (!saveAsIs) {
if (resizeConfig.unsharp) {
sharpInstance.sharpen();
}
sharpInstance.resize(Math.round(scaledWidth), Math.round(scaledHeight), {
fit: 'cover',
position: 'attention',
withoutEnlargement: true
});
}
let res = await sharpInstance.toFormat(outType, formatOptions)
.withMetadata()
.toBuffer({ resolveWithObject: true });
return {
image: {
buffer: res.data,
length: res.info.size,
width: res.info.width,
height: res.info.height,
type: res.info.type
},
type: outType
};
}
// Remove all metadata (Exif, ICC, photoshop stuff, etc.)
//
function filterJpegPreview(buffer) {
buffer = image_traverse.jpeg_segments_filter(buffer, segment => {
if (segment.id >= 0xE1 && segment.id < 0xF0) return false;
return true;
});
return buffer;
}
// Remove metadata (ICC, photoshop stuff, etc.), and filter exif
//
function filterJpegImage(buffer, comment) {
buffer = image_traverse.jpeg_segments_filter(buffer, segment => {
if (segment.id >= 0xE2 && segment.id < 0xF0) return false;
return true;
});
buffer = image_traverse.jpeg_exif_tags_filter(buffer, entry => {
return entry.data_length < 100;
});
if (comment) {
buffer = image_traverse.jpeg_add_comment(buffer, comment);
}
return buffer;
}
// Save buffered images to database
//
// - previews - { orig: { path, type }, ... }
// - maxSize - maximum size to save to database
// - resizeConfig
//
// - callback - function (err, originalFileId)
//
async function saveImages(previews, options) {
let keys = Object.keys(previews);
//
// Check file size
//
for (let i = 0; i < keys.length; i++) {
let size = previews[keys[i]].image.length;
if (options.maxSize && size > options.maxSize) {
throw new Error('Can\'t save file: max size exceeded');
}
}
// Create new ObjectId for orig file.
// You can get file_id from put function, but all previews save async.
let origId = new Mongoose.Types.ObjectId(options.date);
for (let i = 0; i < keys.length; i++) {
let key = keys[i];
let data = previews[key];
let params = { contentType: mime(data.type) };
if (key === 'orig') {
params._id = origId;
} else {
params.filename = origId + '_' + key;
}
let buffer = data.image.buffer;
if (buffer[0] === 0xFF && buffer[1] === 0xD8) {
if (key === 'sm') {
buffer = filterJpegPreview(buffer, options.comment);
} else {
buffer = filterJpegImage(buffer, options.comment);
}
}
await options.store.put(Buffer.from(buffer), params);
}
return origId;
}
module.exports = async function (src, options) {
let previews = {};
//
// Read image from file, determine its size
//
let data = await readFile(src);
let imgSz = await sharp(data).metadata();
let origImage = {
buffer: data,
length: imgSz.size,
width: imgSz.width,
height: imgSz.height,
type: imgSz.type
};
if (imgSz.orientation >= 5) {
[ origImage.width, origImage.height ] = [ origImage.height, origImage.width ];
}
let resizeConfigKeys = Object.keys(options.resize);
for (let i = 0; i < resizeConfigKeys.length; i++) {
let resizeConfigKey = resizeConfigKeys[i];
// Create preview for each size
let resizeConfig = options.resize[resizeConfigKey];
// Next preview will be based on preview in 'from' property
// by default next preview generated from 'orig'
let from = (previews[resizeConfig.from || ''] || previews.orig || {});
let image = from.image || origImage;
let newImage = await createPreview(image, resizeConfig, from.type || options.ext);
previews[resizeConfigKey] = newImage;
}
// Save all previews
let origId = await saveImages(previews, options);
return {
id: origId,
size: previews.orig.image.length,
images: _.mapValues(previews, preview => ({
width: preview.image.width,
height: preview.image.height,
length: preview.image.length
}))
};
};