423 lines
13 KiB
JavaScript
423 lines
13 KiB
JavaScript
const Logger = require('../lib/utils/logger');
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const config = require('../config');
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const fs = require('fs');
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const sizeOf = require('image-size');
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const { create } = require('xmlbuilder2', { encoding: 'utf-8' });
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const { execSync } = require("child_process");
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const { Worker, workerData, parentPort } = require('worker_threads');
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const path = require('path');
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const sanitize = require("sanitize-filename");
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const twemoji = require("twemoji");
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const { getStroke, getStrokePoints } = require('perfect-freehand');
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const jobId = workerData;
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const logger = new Logger('presAnn Process Worker');
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logger.info("Processing PDF for job " + jobId);
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const kickOffNotifierWorker = (jobType, filename) => {
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return new Promise((resolve, reject) => {
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const worker = new Worker('./workers/notifier.js', { workerData: [jobType, jobId, filename] });
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worker.on('message', resolve);
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worker.on('error', reject);
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worker.on('exit', (code) => {
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if (code !== 0)
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reject(new Error(`PresAnn Notifier Worker stopped with exit code ${code}`));
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})
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})
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}
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function align_to_css_property(alignment) {
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switch (alignment) {
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case 'start': return 'left'
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case 'middle': return 'center'
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case 'end': return 'right'
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default: return alignment
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}
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}
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function color_to_hex(color, isStickyNote = false) {
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if (isStickyNote) { color = `sticky-${color}` }
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switch (color) {
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case 'white': return '#1d1d1d'
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case 'sticky-white': return '#fddf8e'
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case 'lightGray': return '#c6cbd1'
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case 'sticky-lightGray': return '#dde0e3'
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case 'gray': return '#788492'
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case 'sticky-gray': return '#b3b9c1'
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case 'black': return '#1d1d1d'
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case 'sticky-black': return '#fddf8e'
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case 'green': return '#36b24d'
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case 'sticky-green': return '#8ed29b'
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case 'cyan': return '#0e98ad'
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case 'sticky-cyan': return '#78c4d0'
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case 'blue': return '#1c7ed6'
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case 'sticky-blue': return '#80b6e6'
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case 'indigo': return '#4263eb'
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case 'sticky-indigo': return '#95a7f2'
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case 'violet': return '#7746f1'
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case 'sticky-violet': return '#b297f5'
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case 'red': return '#ff2133'
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case 'sticky-red': return '#fd838d'
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case 'orange': return '#ff9433'
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case 'sticky-orange': return '#fdc28d'
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case 'yellow': return '#ffc936'
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case 'sticky-yellow': return '#fddf8e'
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default: return color
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}
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}
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function determine_dasharray(dash, gap = 0) {
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switch (dash) {
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case 'dashed': return `stroke-linecap:butt;stroke-dasharray:${gap};`
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case 'dotted': return `stroke-linecap:round;stroke-dasharray:${gap};`
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default: return 'stroke-linejoin:round;stroke-linecap:round;'
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}
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}
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function determine_font_from_family(family) {
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switch (family) {
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case 'script': return 'Caveat Brush'
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default: return family
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}
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}
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function rad_to_degree(angle) {
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return angle * (180 / Math.PI)
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}
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function render_HTMLTextBox(htmlFilePath, id, width, height) {
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let commands = [
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'wkhtmltoimage',
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'--format', 'png',
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'--encoding', `${config.process.whiteboardTextEncoding}`,
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'--transparent',
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'--crop-w', width,
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'--crop-h', height,
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'--log-level', 'none',
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'--quality', '100',
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htmlFilePath, path.join(dropbox, `text${id}.png`)
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]
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execSync(commands.join(' '));
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}
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function get_gap(dash, size) {
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switch (dash) {
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case 'dashed':
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if (size == 'small') { return '8 8' }
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else if (size == 'medium') { return '14 14' }
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else { return '20 20' }
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case 'dotted':
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if (size == 'small') { return '0.1 8' }
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else if (size == 'medium') { return '0.1 14' }
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else { return '0.1 20' }
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default: return '0'
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}
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}
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function get_stroke_width(dash, size) {
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switch (size) {
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case 'small': if (dash === 'draw') { return 1 } else { return 4 };
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case 'medium': if (dash === 'draw') { return 1.75 } else { return 6.25 };
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case 'large': if (dash === 'draw') { return 2.5 } else { return 8.5 }
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default: return 1;
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}
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}
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function text_size_to_px(size, isStickyNote = false) {
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if (isStickyNote) { size = `sticky-${size}` }
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switch (size) {
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case 'sticky-small': return 24
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case 'small': return 28
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case 'sticky-medium': return 36
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case 'medium': return 48
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case 'sticky-large': return 48
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case 'large': return 96
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default: return 28
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}
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}
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function getPath(annotationPoints) {
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// Gets inner path of a stroke outline
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// For solid, dashed, and dotted types
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let stroke = getStrokePoints(annotationPoints).map((strokePoint) => strokePoint.point);
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let [max_x, max_y] = [0, 0];
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let path = stroke.reduce(
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(acc, [x0, y0], i, arr) => {
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if (!arr[i + 1]) return acc
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let [x1, y1] = arr[i + 1]
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if (x1 >= max_x) { max_x = x1 }
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if (y1 >= max_y) { max_y = y1 }
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acc.push(x0, y0, (x0 + x1) / 2, (y0 + y1) / 2)
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return acc
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},
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['M', ...stroke[0], 'Q']
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)
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path.join(' ');
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return [path, max_x, max_y];
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}
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function getOutlinePath(annotationPoints) {
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// From steveruizok/perfect-freehand
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// Gets outline of a hand-drawn input, with pressure
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let stroke = getStroke(annotationPoints, {
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simulatePressure: true,
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size: 8,
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});
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let [max_x, max_y] = [0, 0];
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let path = stroke.reduce(
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(acc, [x0, y0], i, arr) => {
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let [x1, y1] = arr[(i + 1) % arr.length]
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if (x1 >= max_x) { max_x = x1 }
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if (y1 >= max_y) { max_y = y1 }
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acc.push(x0, y0, (x0 + x1) / 2, (y0 + y1) / 2)
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return acc;
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},
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['M', ...stroke[0], 'Q']
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);
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path.push('Z');
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path.join(' ');
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return [path, max_x, max_y];
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}
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function overlay_draw(svg, annotation) {
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let dash = annotation.style.dash;
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let [path, max_x, max_y] = (dash == 'draw') ? getOutlinePath(annotation.points) : getPath(annotation.points);
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if (!path.length) return;
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let shapeColor = color_to_hex(annotation.style.color);
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let rotation = rad_to_degree(annotation.rotation);
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let thickness = get_stroke_width(dash, annotation.style.size);
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let gap = get_gap(dash, annotation.style.size);
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let [x, y] = annotation.point;
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console.log(annotation);
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let stroke_dasharray = determine_dasharray(dash, gap);
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let fill = (dash === 'draw') ? shapeColor : 'none';
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svg.ele('g', {
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style: `stroke:${shapeColor};stroke-width:${thickness};fill:${fill};${stroke_dasharray}`,
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}).ele('path', {
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d: path,
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transform: `translate(${x} ${y}), rotate(${rotation} ${max_x / 2} ${max_y / 2})`
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}).up()
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}
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function overlay_sticky(svg, annotation) {
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let backgroundColor = color_to_hex(annotation.style.color, true);
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let fontSize = text_size_to_px(annotation.style.size, true);
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let rotation = rad_to_degree(annotation.rotation);
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let font = determine_font_from_family(annotation.style.font);
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let textAlign = align_to_css_property(annotation.style.textAlign);
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let [textBoxWidth, textBoxHeight] = annotation.size;
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let [textBox_x, textBox_y] = annotation.point;
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var html = twemoji.parse(
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`<!DOCTYPE html>
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<style>
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img.emoji { height: 1em; width: 1em; }
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p {
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width:${textBoxWidth}px;
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height:${textBoxHeight}px;
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color:#0d0d0d;
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word-wrap:break-word;
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font-family:${font};
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font-size:${fontSize}px;
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text-align:${textAlign};
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background-color:${backgroundColor};
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}
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</style>
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<html>
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<p>${annotation.text.split('\n').join('<br>')}</p>
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</html>`);
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var htmlFilePath = path.join(dropbox, `text${annotation.id}.html`)
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fs.writeFileSync(htmlFilePath, html, function (err) {
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if (err) logger.error(err);
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})
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render_HTMLTextBox(htmlFilePath, annotation.id, textBoxWidth, textBoxHeight)
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svg.ele('image', {
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'xlink:href': `file://${dropbox}/text${annotation.id}.png`,
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x: textBox_x,
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y: textBox_y,
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width: textBoxWidth,
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height: textBoxHeight,
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transform: `rotate(${rotation}, ${textBox_x + (textBoxWidth / 2)}, ${textBox_y + (textBoxHeight / 2)})`
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}).up();
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}
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function overlay_text(svg, annotation) {
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let fontColor = color_to_hex(annotation.style.color);
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let fontSize = text_size_to_px(annotation.style.size);
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// let rotation = rad_to_degree(annotation.rotation);
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let font = determine_font_from_family(annotation.style.font);
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let [textBox_x, textBox_y] = annotation.point;
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let textNode = svg.ele('text', {
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'x': textBox_x,
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'y': textBox_y,
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'font-size': fontSize,
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'font-family': font,
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'fill': fontColor,
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});
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for (let line of annotation.text.split('\n')) {
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if (line === '\n') { line = '' }
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textNode.ele('tspan', { x: textBox_x, dy: '1em' }).txt(line).up()
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}
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}
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function overlay_annotations(svg, currentSlideAnnotations, w, h) {
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for (let annotation of currentSlideAnnotations) {
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switch (annotation.annotationInfo.type) {
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// case 'ellipse':
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// overlay_ellipse(svg, annotation.annotationInfo, w, h);
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// break;
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// case 'line':
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// overlay_line(svg, annotation.annotationInfo, w, h);
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// break;
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// case 'pencil':
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// overlay_pencil(svg, annotation.annotationInfo, w, h);
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// break;
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// case 'rectangle':
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// overlay_rectangle(svg, annotation.annotationInfo, w, h);
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// break;
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case 'draw':
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overlay_draw(svg, annotation.annotationInfo);
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break;
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case 'sticky':
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overlay_sticky(svg, annotation.annotationInfo);
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break;
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case 'text':
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overlay_text(svg, annotation.annotationInfo);
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break;
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// case 'triangle':
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// overlay_triangle(svg, annotation.annotationInfo, w, h);
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// break;
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default:
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logger.error(`Unknown annotation type ${annotation.annotationInfo.type}.`);
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}
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}
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}
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// Process the presentation pages and annotations into a PDF file
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// 1. Get the job
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const dropbox = path.join(config.shared.presAnnDropboxDir, jobId);
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let job = fs.readFileSync(path.join(dropbox, 'job'));
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let exportJob = JSON.parse(job);
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// 2. Get the annotations
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let annotations = fs.readFileSync(path.join(dropbox, 'whiteboard'));
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let whiteboard = JSON.parse(annotations);
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let pages = JSON.parse(whiteboard.pages);
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let ghostScriptInput = ""
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// 3. Convert annotations to SVG
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for (let currentSlide of pages) {
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var dimensions = sizeOf(path.join(dropbox, `slide${currentSlide.page}.png`));
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var slideWidth = dimensions.width;
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var slideHeight = dimensions.height;
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// Create the SVG slide with the background image
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let svg = create({ version: '1.0', encoding: 'UTF-8' })
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.ele('svg', {
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xmlns: 'http://www.w3.org/2000/svg',
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'xmlns:xlink': 'http://www.w3.org/1999/xlink',
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width: slideWidth,
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height: slideHeight,
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})
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.dtd({
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pubID: '-//W3C//DTD SVG 1.1//EN',
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sysID: 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'
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})
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.ele('image', {
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'xlink:href': `file://${dropbox}/slide${currentSlide.page}.png`,
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width: slideWidth,
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height: slideHeight,
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})
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.up()
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.ele('g', {
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class: 'canvas'
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});
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// 4. Overlay annotations onto slides
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// Based on /record-and-playback/presentation/scripts/publish/presentation.rb
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overlay_annotations(svg, currentSlide.annotations, slideWidth, slideHeight)
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svg = svg.end({ prettyPrint: true });
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// Write annotated SVG file
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let SVGfile = path.join(dropbox, `annotated-slide${currentSlide.page}.svg`)
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let PDFfile = path.join(dropbox, `annotated-slide${currentSlide.page}.pdf`)
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fs.writeFileSync(SVGfile, svg, function (err) {
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if (err) { return logger.error(err); }
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});
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let convertAnnotatedSlide = [
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'cairosvg',
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SVGfile,
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'-o', PDFfile
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].join(' ');
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execSync(convertAnnotatedSlide);
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ghostScriptInput += `${PDFfile} `
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}
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// Create PDF output directory if it doesn't exist
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let output_dir = path.join(exportJob.presLocation, 'pdfs', jobId);
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if (!fs.existsSync(output_dir)) { fs.mkdirSync(output_dir, { recursive: true }); }
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let filename = sanitize(exportJob.filename.replace(/\s/g, '_'));
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console.log(filename)
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let mergePDFs = [
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'gs',
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'-dNOPAUSE',
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'-sDEVICE=pdfwrite',
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`-sOUTPUTFILE="${path.join(output_dir, `${filename}.pdf`)}"`,
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`-dBATCH`,
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ghostScriptInput,
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].join(' ');
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// Resulting PDF file is stored in the presentation dir
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execSync(mergePDFs);
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// Launch Notifier Worker depending on job type
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logger.info(`Saved PDF at ${output_dir}/${jobId}/${filename}.pdf`);
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kickOffNotifierWorker(exportJob.jobType, filename);
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parentPort.postMessage({ message: workerData });
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