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124 lines
3.1 KiB
JavaScript
124 lines
3.1 KiB
JavaScript
import * as ExifParser from "exif-parser";
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import removeEXIF from "../lib/remove-exif.js";
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import Utils from "../Utils.js";
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import FileType from "./FileType.js";
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/**
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* Image operations.
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*
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* @author tlwr [toby@toby.codes]
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* @copyright Crown Copyright 2017
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* @license Apache-2.0
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*
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* @namespace
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*/
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const Image = {
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/**
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* Extract EXIF operation.
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*
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* Extracts EXIF data from a byteArray, representing a JPG or a TIFF image.
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*
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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runExtractEXIF(input, args) {
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try {
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const parser = ExifParser.create(input);
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const result = parser.parse();
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let lines = [];
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for (let tagName in result.tags) {
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let value = result.tags[tagName];
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lines.push(`${tagName}: ${value}`);
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}
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const numTags = lines.length;
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lines.unshift(`Found ${numTags} tags.\n`);
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return lines.join("\n");
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} catch (err) {
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throw "Could not extract EXIF data from image: " + err;
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}
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},
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/**
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* Remove EXIF operation.
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*
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* Removes EXIF data from a byteArray, representing a JPG.
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*
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* @author David Moodie [davidmoodie12@gmail.com]
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* @param {byteArray} input
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* @param {Object[]} args
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* @returns {byteArray}
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*/
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runRemoveEXIF(input, args) {
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// Do nothing if input is empty
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if (input.length === 0) return input;
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try {
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return removeEXIF(input);
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} catch (err) {
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// Simply return input if no EXIF data is found
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if (err === "Exif not found.") return input;
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throw "Could not remove EXIF data from image: " + err;
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}
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},
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/**
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* @constant
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* @default
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*/
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INPUT_FORMAT: ["Raw", "Base64", "Hex"],
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/**
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* Render Image operation.
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*
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* @author n1474335 [n1474335@gmail.com]
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* @param {string} input
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* @param {Object[]} args
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* @returns {html}
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*/
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runRenderImage(input, args) {
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const inputFormat = args[0];
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let dataURI = "data:";
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if (!input.length) return "";
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// Convert input to raw bytes
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switch (inputFormat) {
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case "Hex":
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input = Utils.fromHex(input);
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break;
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case "Base64":
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// Don't trust the Base64 entered by the user.
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// Unwrap it first, then re-encode later.
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input = Utils.fromBase64(input, null, "byteArray");
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break;
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case "Raw":
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default:
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input = Utils.strToByteArray(input);
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break;
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}
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// Determine file type
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const type = FileType.magicType(input);
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if (type && type.mime.indexOf("image") === 0) {
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dataURI += type.mime + ";";
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} else {
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throw "Invalid file type";
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}
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// Add image data to URI
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dataURI += "base64," + Utils.toBase64(input);
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return "<img src='" + dataURI + "'>";
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},
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};
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export default Image;
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