106 lines
2.7 KiB
JavaScript
106 lines
2.7 KiB
JavaScript
'use strict';
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import Manifest from '../src/Manifest.js';
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import Sequence from '../src/Sequence.js';
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import Canvas from '../src/Canvas.js';
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import Image from '../src/Image.js';
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import * as fs from 'fs';
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/**
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* @typedef {Obj}
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*/
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/**
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* Generate a manifest object to serve
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* @param {string} manifestId
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*/
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export default async function generateManifest(manifestId) {
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const IIIF_API_VERSION = process.env.IIIF_API_VERSION;
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const BASE_URL = process.env.BASE_URL;
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let manifest = new Manifest(IIIF_API_VERSION, BASE_URL);
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manifest.generateID(manifestId);
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manifest = await populateCanvases(
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manifest,
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await getImageList(manifestId),
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manifestId
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);
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return manifest.toObject();
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}
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/**
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* @param {string} manifestId
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*/
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async function getImageList(manifestId) {
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let folderName = manifestId.replace(/pherc-(\d+)-(\w+)$/, function (_match, g1, g2) {
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return `PHerc_${g1}_${g2.toUpperCase()}`;
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});
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folderName += '_iiif';
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return await fs.promises.readdir(`${process.env.IMAGES_DIR}/${folderName}`);
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}
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/**
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* @todo Read height & width from info.json
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* @param {Manifest} manifest
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* @param {string[]} images List of image filenames from folder
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* @returns {Manifest}
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*/
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async function populateCanvases(manifest, images, manifestId) {
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const IIIF_API_VERSION = process.env.IIIF_API_VERSION;
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const BASE_URL = process.env.BASE_URL;
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const sequence = new Sequence(BASE_URL);
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// There's only one sequence
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sequence.generateID(manifestId, 0);
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for (let img of images) {
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let canvas = new Canvas(IIIF_API_VERSION, BASE_URL);
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const canvasName = img.split('_')[3].replace(/\.[\w\d]{2,3}$/,'');
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canvas.generateID(manifestId, canvasName);
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canvas.setLabel(`${manifestId}-${canvasName.toLowerCase()}`);
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let image = new Image(canvas.id);
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image.generateID(process.env.IMAGE_SERVER_URL, img);
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const imgSize = await getImageSize(image.id);
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image.setSize(imgSize.height, imgSize.width);
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canvas.setThumbnail(
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imgSize.thumb.height,
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imgSize.thumb.width,
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image.id
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);
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canvas.addImage(image);
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sequence.addCanvas(canvas);
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}
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manifest.addSequence(sequence);
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return manifest;
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}
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/**
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* @todo Read height & width from info.json
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* @param {string} imageId The image's id as a URL to the image server
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* @returns {{width: number, height: number, thumb: {width: number, height: number}}}
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*/
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async function getImageSize(imageId) {
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let infoURL = imageId.replace(/full.*$/,'info.json');
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const res = await fetch(infoURL);
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let size = {};
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if (res.ok) {
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const infoJson = await res.json();
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const maxSize = infoJson.sizes[infoJson.sizes.length - 1];
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size.height = maxSize.height;
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size.width = maxSize.width;
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size.thumb = {
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width: infoJson.sizes[1].width,
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height: infoJson.sizes[1].height,
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}
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}
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return size;
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} |