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93 lines
3.2 KiB
JavaScript
93 lines
3.2 KiB
JavaScript
const Promise = require('bluebird');
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const errors = require('@tryghost/errors');
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const fs = require('fs-extra');
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const path = require('path');
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/**
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* @NOTE: Sharp cannot operate on the same image path, that's why we have to use in & out paths.
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*
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* We currently can't enable compression or having more config options, because of
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* https://github.com/lovell/sharp/issues/1360.
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*
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* Resize an image referenced by the `in` path and write it to the `out` path
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* @param {{in, out, width}} options
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*/
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const unsafeResizeFromPath = (options = {}) => {
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return fs.readFile(options.in)
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.then((data) => {
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return unsafeResizeFromBuffer(data, {
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width: options.width
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});
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})
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.then((data) => {
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return fs.writeFile(options.out, data);
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});
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};
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/**
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* Resize an image
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*
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* @param {Buffer} originalBuffer image to resize
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* @param {{width, height}} options
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* @returns {Buffer} the resizedBuffer
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*/
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const unsafeResizeFromBuffer = (originalBuffer, {width, height} = {}) => {
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const sharp = require('sharp');
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return sharp(originalBuffer)
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.resize(width, height, {
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// CASE: dont make the image bigger than it was
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withoutEnlargement: true
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})
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// CASE: Automatically remove metadata and rotate based on the orientation.
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.rotate()
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.toBuffer()
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.then((resizedBuffer) => {
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return resizedBuffer.length < originalBuffer.length ? resizedBuffer : originalBuffer;
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});
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};
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/**
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* Check if this tool can handle a particular extension
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* NOTE: .gif optimization is currently not supported by sharp but will be soon
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* as there has been support added in underlying libvips library https://github.com/lovell/sharp/issues/1372
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* As for .svg files, sharp only supports conversion to png, and this does not
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* play well with animated svg files
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* @param {String} ext the extension to check, including the leading dot
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*/
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const canTransformFileExtension = ext => !['.gif', '.svg', '.svgz', '.ico'].includes(ext);
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/**
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* Internal utility to wrap all transform functions in error handling
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* Allows us to keep Sharp as an optional dependency
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*
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* @param {Function} fn
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*/
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const makeSafe = fn => (...args) => {
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try {
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require('sharp');
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} catch (err) {
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return Promise.reject(new errors.InternalServerError({
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message: 'Sharp wasn\'t installed',
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code: 'SHARP_INSTALLATION',
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err: err
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}));
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}
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return fn(...args).catch((err) => {
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throw new errors.InternalServerError({
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message: 'Unable to manipulate image.',
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err: err,
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code: 'IMAGE_PROCESSING'
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});
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});
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};
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const generateOriginalImageName = (originalPath) => {
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const parsedFileName = path.parse(originalPath);
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return path.join(parsedFileName.dir, `${parsedFileName.name}_o${parsedFileName.ext}`);
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};
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module.exports.generateOriginalImageName = generateOriginalImageName;
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module.exports.canTransformFileExtension = canTransformFileExtension;
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module.exports.resizeFromPath = makeSafe(unsafeResizeFromPath);
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module.exports.resizeFromBuffer = makeSafe(unsafeResizeFromBuffer);
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