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| const fs = require('fs-extra');
const Boom = require('boom');
const _ = require('lodash');
const Frisbee = require('frisbee');
const FormData = require('form-data');
const safeStringify = require('fast-safe-stringify');
const debug = require('debug')('lipo');
const boolean = require('boolean');
const sharp = require('sharp');
const INVALID_FILE = 'File upload was invalid.';
const INVALID_QUEUE = 'Image transformation queue was invalid.';
function Lipo(options = {}) {
this.__options = Object.assign(
{
key: '',
baseURI:
process.env.NODE_ENV === 'test'
? 'http://localhost:3000'
: 'https://lipo.io'
},
options
);
debug('options %o', this.__options);
this.__api = new Frisbee({
baseURI: this.__options.baseURI,
headers: {
Accept: 'application/json'
}
});
Iif (this.__options.key) {
debug('using auth key %s', this.__options.key);
this.__api.auth(this.__options.key);
}
this.__queue = [];
return (input, options = {}) => {
// input = Buffer | String
// options = Object
// - density (Number)
// - raw (Object)
// - width (Number)
// - height (Number)
// - channels (Number; 1-4)
// - create (Object)
// - width (Number)
// - height (Number)
// - channels (Number; 3-4)
// - background (String | Object)
debug('set input to %s', input);
this.__input = input;
debug('set options to %o', options);
this.__options = options;
return this;
};
}
// Object.keys(require('sharp').prototype).filter(key => !key.startsWith('_'))
const keys = [
'clone',
'metadata',
'limitInputPixels',
'sequentialRead',
'resize',
'crop',
'embed',
'max',
'min',
'ignoreAspectRatio',
'withoutEnlargement',
'overlayWith',
'rotate',
'extract',
'flip',
'flop',
'sharpen',
'blur',
'extend',
'flatten',
'trim',
'gamma',
'negate',
'normalise',
'normalize',
'convolve',
'threshold',
'boolean',
'background',
'greyscale',
'grayscale',
'toColourspace',
'toColorspace',
'extractChannel',
'joinChannel',
'bandbool',
'toFile',
'toBuffer',
'withMetadata',
'jpeg',
'png',
'webp',
'tiff',
'raw',
'toFormat',
'tile'
];
Lipo.prototype.__toFile = function(fileOut, fn) {
debug('fileOut %s', fileOut);
Iif (!_.isString(fileOut)) throw new Error('File output path required');
const promise = new Promise(async (resolve, reject) => {
try {
const data = await this.__toBuffer();
await fs.writeFile(fileOut, data);
resolve(this.__info);
} catch (err) {
reject(err);
}
});
if (_.isFunction(fn))
promise
.then(data => {
fn(null, data);
})
.catch(fn);
else return promise;
};
Lipo.prototype.__toBuffer = function(fn) {
debug('queue', this.__queue);
debug('input', this.__input);
const promise = new Promise(async (resolve, reject) => {
try {
const body = new FormData();
Eif (_.isString(this.__input))
body.append('input', fs.createReadStream(this.__input));
else if (_.isBuffer(this.__input)) body.append('input', this.__input);
else throw new Error('Input must be a String or Buffer');
body.append('queue', safeStringify(this.__queue));
this.__queue = [];
const res = await this.__api.post('/', { body });
Iif (res.err) throw res.err;
this.__info = {
format: res.headers.get('x-sharp-format'),
size: Number(res.headers.get('x-sharp-size')),
width: Number(res.headers.get('x-sharp-width')),
height: Number(res.headers.get('x-sharp-height')),
channels: Number(res.headers.get('x-sharp-channels')),
premultiplied: boolean(res.headers.get('x-sharp-multiplied'))
};
resolve(Buffer.concat(res.originalResponse._raw));
} catch (err) {
reject(err);
}
});
if (_.isFunction(fn))
promise
.then(data => {
fn(null, data, this.__info);
})
.catch(fn);
else return promise;
};
keys.forEach(key => {
Lipo.prototype[key] = function() {
debug(`${key} called with arguments`, [].slice.call(arguments));
if (!['toFile', 'toBuffer'].includes(key)) {
this.__queue.push([key].concat([].slice.call(arguments)));
return this;
}
if (key === 'toFile') return this.__toFile(...[].slice.call(arguments));
return this.__toBuffer(...[].slice.call(arguments));
};
});
Lipo.middleware = async function(ctx) {
try {
Iif (!ctx.req.file)
throw Boom.badRequest(
_.isFunction(ctx.req.t) ? ctx.req.t(INVALID_FILE) : INVALID_FILE
);
const err = Boom.badRequest(
_.isFunction(ctx.req.t) ? ctx.req.t(INVALID_QUEUE) : INVALID_QUEUE
);
Iif (!_.isString(ctx.req.body.queue)) throw Boom.badRequest(err);
const queue = JSON.parse(ctx.req.body.queue);
Iif (!_.isArray(queue) || _.isEmpty(queue)) throw Boom.badRequest(err);
const transform = _.reduce(
queue,
(transform, task) => transform[task.shift()](...task),
sharp()
).on('info', info => {
Object.keys(info).forEach(key => {
ctx.set(`x-sharp-${key}`, info[key]);
});
});
ctx.body = ctx.req.file.stream.pipe(transform);
} catch (err) {
ctx.throw(err);
}
};
module.exports = Lipo;
|