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import * as fs from 'fs';
import { Utils } from '../Utils';
import * as path from 'path';
import * as sharp from 'sharp';
import request = require('request-promise');
import { ExifData, ExifImage } from 'exif';
import { Opt } from '../new_fields/Doc';
const uploadDirectory = path.join(__dirname, './public/files/');
export namespace DashUploadUtils {
export interface Size {
width: number;
suffix: string;
}
export const Sizes: { [size: string]: Size } = {
SMALL: { width: 100, suffix: "_s" },
MEDIUM: { width: 400, suffix: "_m" },
LARGE: { width: 900, suffix: "_l" },
};
const gifs = [".gif"];
const pngs = [".png"];
const jpgs = [".jpg", ".jpeg"];
export const imageFormats = [...pngs, ...jpgs, ...gifs];
const videoFormats = [".mov", ".mp4"];
const size = "content-length";
const type = "content-type";
export interface UploadInformation {
mediaPaths: string[];
fileNames: { [key: string]: string };
exifData: EnrichedExifData;
contentSize?: number;
contentType?: string;
}
const generate = (prefix: string, url: string) => `${prefix}upload_${Utils.GenerateGuid()}${sanitizeExtension(url)}`;
const sanitize = (filename: string) => filename.replace(/\s+/g, "_");
const sanitizeExtension = (source: string) => {
let extension = path.extname(source);
extension = extension.toLowerCase();
extension = extension.split("?")[0];
return extension;
};
/**
* Uploads an image specified by the @param source to Dash's /public/files/
* directory, and returns information generated during that upload
*
* @param {string} source is either the absolute path of an already uploaded image or
* the url of a remote image
* @param {string} filename dictates what to call the image. If not specified,
* the name {@param prefix}_upload_{GUID}
* @param {string} prefix is a string prepended to the generated image name in the
* event that @param filename is not specified
*
* @returns {UploadInformation} This method returns
* 1) the paths to the uploaded images (plural due to resizing)
* 2) the file name of each of the resized images
* 3) the size of the image, in bytes (4432130)
* 4) the content type of the image, i.e. image/(jpeg | png | ...)
*/
export const UploadImage = async (source: string, filename?: string, prefix: string = ""): Promise<UploadInformation> => {
const metadata = await InspectImage(source);
return UploadInspectedImage(metadata, filename, prefix);
};
export interface InspectionResults {
isLocal: boolean;
stream: any;
normalizedUrl: string;
exifData: EnrichedExifData;
contentSize?: number;
contentType?: string;
}
export interface EnrichedExifData {
data: ExifData;
error?: string;
}
/**
* Based on the url's classification as local or remote, gleans
* as much information as possible about the specified image
*
* @param source is the path or url to the image in question
*/
export const InspectImage = async (source: string): Promise<InspectionResults> => {
const { isLocal, stream, normalized: normalizedUrl } = classify(source);
const exifData = await parseExifData(source);
const results = {
exifData,
isLocal,
stream,
normalizedUrl
};
// stop here if local, since request.head() can't handle local paths, only urls on the web
if (isLocal) {
return results;
}
const metadata = (await new Promise<any>((resolve, reject) => {
request.head(source, async (error, res) => {
if (error) {
return reject(error);
}
resolve(res);
});
})).headers;
return {
contentSize: parseInt(metadata[size]),
contentType: metadata[type],
...results
};
};
export const UploadInspectedImage = async (metadata: InspectionResults, filename?: string, prefix = ""): Promise<UploadInformation> => {
const { isLocal, stream, normalizedUrl, contentSize, contentType, exifData } = metadata;
const resolved = filename ? sanitize(filename) : generate(prefix, normalizedUrl);
const extension = sanitizeExtension(normalizedUrl || resolved);
let information: UploadInformation = {
mediaPaths: [],
fileNames: { clean: resolved },
exifData,
contentSize,
contentType,
};
return new Promise<UploadInformation>(async (resolve, reject) => {
const resizers = [
{ resizer: sharp().rotate(), suffix: "_o" },
...Object.values(Sizes).map(size => ({
resizer: sharp().resize(size.width, undefined, { withoutEnlargement: true }).rotate(),
suffix: size.suffix
}))
];
let nonVisual = false;
if (pngs.includes(extension)) {
resizers.forEach(element => element.resizer = element.resizer.png());
} else if (jpgs.includes(extension)) {
resizers.forEach(element => element.resizer = element.resizer.jpeg());
} else if (![...imageFormats, ...videoFormats].includes(extension.toLowerCase())) {
nonVisual = true;
}
if (imageFormats.includes(extension)) {
for (let resizer of resizers) {
const suffix = resizer.suffix;
let mediaPath: string;
await new Promise<void>(resolve => {
const filename = resolved.substring(0, resolved.length - extension.length) + suffix + extension;
information.mediaPaths.push(mediaPath = uploadDirectory + filename);
information.fileNames[suffix] = filename;
stream(normalizedUrl).pipe(resizer.resizer).pipe(fs.createWriteStream(mediaPath))
.on('close', resolve)
.on('error', reject);
});
}
}
if (!isLocal || nonVisual) {
await new Promise<void>(resolve => {
stream(normalizedUrl).pipe(fs.createWriteStream(uploadDirectory + resolved)).on('close', resolve);
});
}
resolve(information);
});
};
const classify = (url: string) => {
const isLocal = /Dash-Web(\\|\/)src(\\|\/)server(\\|\/)public(\\|\/)files/g.test(url);
return {
isLocal,
stream: isLocal ? fs.createReadStream : request,
normalized: isLocal ? path.normalize(url) : url
};
};
const parseExifData = async (source: string): Promise<EnrichedExifData> => {
return new Promise<EnrichedExifData>(resolve => {
new ExifImage(source, (error, data) => {
let reason: Opt<string> = undefined;
if (error) {
reason = (error as any).code;
}
resolve({ data, error: reason });
});
});
};
export const createIfNotExists = async (path: string) => {
if (await new Promise<boolean>(resolve => fs.exists(path, resolve))) {
return true;
}
return new Promise<boolean>(resolve => fs.mkdir(path, error => resolve(error === null)));
};
export const Destroy = (mediaPath: string) => new Promise<boolean>(resolve => fs.unlink(mediaPath, error => resolve(error === null)));
}
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