WIP, pretty much there with serving image, just some layout stuff.
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3 changed files with 169 additions and 53 deletions
1
node/.gitignore
vendored
1
node/.gitignore
vendored
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@ -2,3 +2,4 @@ node_modules/
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.DS_Store
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hits.db
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hits.db-*
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example_counter_bg.png
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@ -1,10 +1,10 @@
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import e, { Request, Response, NextFunction } from 'express';
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import { type Database as DB } from 'better-sqlite3';
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import { type Statement } from 'better-sqlite3';
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import Database from 'better-sqlite3';
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// import sharp for images
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import sharp, { FormatEnum, AvailableFormatInfo, Sharp } from 'sharp';
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import sharp, { FormatEnum, AvailableFormatInfo, Sharp, Metadata } from 'sharp';
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import * as fs from 'fs';
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import * as https from 'https';
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// Map file extensions to sharp formats
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const imageFormatMap: { [key: string]: keyof FormatEnum | AvailableFormatInfo } = {
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@ -16,6 +16,16 @@ const imageFormatMap: { [key: string]: keyof FormatEnum | AvailableFormatInfo }
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gif: 'gif'
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};
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// no need for third party library
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const mimeTypeMap: { [key: string]: string } = {
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jpg: 'image/jpeg',
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jpeg: 'image/jpeg',
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png: 'image/png',
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webp: 'image/webp',
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tiff: 'image/tiff',
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gif: 'image/gif'
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};
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interface HitResult {
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hits: number;
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}
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@ -33,6 +43,50 @@ interface HitCounterRenderer {
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render(): Promise<any>;
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}
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function fileExt(file: string): string {
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const fileExt = file.split('.').pop();
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if (!fileExt) {
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throw new Error('Invalid file extension');
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}
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return fileExt.toLowerCase();
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}
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function extToFormat(ext: string): keyof FormatEnum | AvailableFormatInfo {
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const format = imageFormatMap[ext];
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if (!format) {
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throw new Error('Unsupported file extension');
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}
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return format;
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}
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/**
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* Determine whether the given `path` is a http(s) URL. This method
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* accepts a string value and a URL instance.
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*
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* inspiration:
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* Marcus Pöhls
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* https://futurestud.io/tutorials/node-js-check-if-a-path-is-a-file-url
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*
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* @param {String|URL} path
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*
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* @returns {Boolean}
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*/
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function isWebURI(path) {
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// `path` is neither a string nor a URL -> early return
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if (typeof path !== 'string' && !(path instanceof URL)) {
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return false
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}
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try {
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const url = new URL(path)
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return url.protocol === 'http:' || url.protocol === 'https:'
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} catch (error) {
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return false
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}
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}
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class BaseHitCounterRenderer implements HitCounterRenderer {
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protected counter: HitCounter;
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protected config: HitCounterConfig;
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@ -53,17 +107,31 @@ class BaseHitCounterRenderer implements HitCounterRenderer {
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class ImageHitCounterRenderer extends BaseHitCounterRenderer {
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private imageType: string;
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private imageFormat: keyof FormatEnum | AvailableFormatInfo;
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private baseImage: Buffer;
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private baseImageMetadata: Metadata;
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constructor(counter: HitCounter, config: HitCounterConfig) {
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super(counter, config);
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const fileExt = this.config.imageFile.split('.').pop();
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if (!fileExt) {
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throw new Error('Invalid file extension');
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}
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this.imageType = fileExt;
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this.imageFormat = imageFormatMap[fileExt.toLowerCase()];
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if (!this.imageFormat) {
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throw new Error('Unsupported file extension');
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}
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this.imageType = fileExt(this.config.imageFile);
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this.imageFormat = extToFormat(this.imageType);
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}
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private async downloadImage(): Promise<Buffer> {
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return new Promise((resolve, reject) => {
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let buf = Buffer.alloc(0);
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const request = https.get(this.config.backgroundImageUrl, (response) => {
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response.on('data', (chunk) => {
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buf = Buffer.concat([buf, chunk]);
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});
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response.on('end', () => {
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resolve(buf);
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});
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});
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request.on('error', (err) => {
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fs.unlink(this.config.backgroundCacheFile, () => {
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reject(err);
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});
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});
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});
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}
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private async cachedBackgroundImage(overWrite: boolean = false): Promise<Sharp> {
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@ -78,71 +146,91 @@ class ImageHitCounterRenderer extends BaseHitCounterRenderer {
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}
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// store the image in the cache
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const fileExt = dest.split('.').pop();
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if (!fileExt) {
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throw new Error('Invalid file extension');
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}
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const ext = fileExt(this.config.backgroundImageUrl);
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const format = imageFormatMap[fileExt.toLowerCase()];
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if (!format) {
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throw new Error('Unsupported file extension');
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const format = extToFormat(ext);
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if (isWebURI(this.config.backgroundImageUrl)) {
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const buf = await this.downloadImage();
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const image = sharp(buf).toFormat(format);
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await image.toFile(dest);
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return image;
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} else {
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if (fs.existsSync(this.config.backgroundImageUrl)) {
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const image = sharp(this.config.backgroundImageUrl).toFormat(format);
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await image.toFile(dest);
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return image;
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} else {
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throw new Error('Background image does not exist');
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}
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}
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const image = sharp(this.config.backgroundImageUrl).toFormat(format);
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await image.toFile(dest);
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return image;
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}
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async render(): Promise<Sharp> {
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const hits = await this.counter.getHits();
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async prepareBaseImage(): Promise<void> {
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if (typeof this.baseImage !== 'undefined') {
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return;
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}
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const bgImage = await this.cachedBackgroundImage();
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const bgInfo = await bgImage.metadata();
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const text = this.config.customText;
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const secondaryText = this.config.secondaryText;
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const textColor = this.config.textColorRGB;
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const secondaryTextColor = this.config.secondaryTextColorRGB;
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const numberColor = this.config.numberColorRGB;
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const frameColor = this.config.frameColorRGB;
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const drawFrame = this.config.drawFrame;
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const textX = this.config.textPositionX;
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const textY = this.config.textPositionY;
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const numberX = this.config.numberPositionX;
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const numberY = this.config.numberPositionY;
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const imgWidth = bgInfo.width;
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const imgHeight = bgInfo.height;
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if (typeof imgWidth === 'undefined' || typeof imgHeight === 'undefined') {
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throw new Error('Invalid image dimensions');
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}
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const svgFrame = `
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<svg width="${bgInfo.width}" height="${bgInfo.height}" xmlns="http://www.w3.org/2000/svg">
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<rect x="0" y="0" width="${bgInfo.width}" height="${bgInfo.height}" stroke="rgb(${frameColor.r},${frameColor.g},${frameColor.b})" stroke-width="2" fill="none"/>
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<rect x="${this.config.borderWidth}" y="${this.config.borderWidth}" width="${imgWidth - 2 * this.config.borderWidth}" height="${imgHeight - 2 * this.config.borderWidth}" fill="none" stroke-alignment="inner" stroke="rgb(${this.config.frameColorRGB.r},${this.config.frameColorRGB.g},${this.config.frameColorRGB.b})" stroke-width="${this.config.borderWidth}"/>
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</svg>
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`;
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const svgOverlay = `
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<svg width="${bgInfo.width}" height="${bgInfo.height}" xmlns="http://www.w3.org/2000/svg">
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<text x="${textX}" y="${textY}" fill="rgb(${textColor.r},${textColor.g},${textColor.b})" font-size="12">${text}</text>
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<text x="${textX}" y="${textY + 15}" fill="rgb(${secondaryTextColor.r},${secondaryTextColor.g},${secondaryTextColor.b})" font-size="12">${secondaryText}</text>
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<text x="${numberX}" y="${numberY}" fill="rgb(${numberColor.r},${numberColor.g},${numberColor.b})" font-size="12">${hits}</text>
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<text x="${this.config.textPositionX}" y="${this.config.textPositionY}" fill="rgb(${this.config.textColorRGB.r},${this.config.textColorRGB.g},${this.config.textColorRGB.b})" font-size="${this.config.fontSize}" font-family="${this.config.fontFace}">${this.config.customText}</text>
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<text x="${this.config.textPositionX}" y="${this.config.textPositionY + 15}" fill="rgb(${this.config.textColorRGB.r},${this.config.textColorRGB.g},${this.config.textColorRGB.b})" font-size="${this.config.fontSize}" font-family="${this.config.fontFace}">${this.config.secondaryText}</text>
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</svg>
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`;
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const overlay = sharp(Buffer.from(svgOverlay));
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if (drawFrame) {
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if (this.config.drawFrame) {
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const frame = sharp(Buffer.from(svgFrame));
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const composite = bgImage.composite([
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{ input: await overlay.toBuffer(), gravity: 'northwest' },
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{ input: await frame.toBuffer(), gravity: 'northwest' }
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]);
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return composite;
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const preparedImg = composite.toFormat(this.imageFormat);
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this.baseImageMetadata = await preparedImg.metadata();
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this.baseImage = await preparedImg.toBuffer();;
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}
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const composite = bgImage.composite([
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{ input: await overlay.toBuffer(), gravity: 'northwest' }
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]);
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return composite;
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const preparedImg = composite.toFormat(this.imageFormat);
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this.baseImageMetadata = await preparedImg.metadata();
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this.baseImage = await preparedImg.toBuffer();
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}
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async render(): Promise<Buffer> {
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const hits = await this.counter.getHits();
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const numberColor = this.config.numberColorRGB;
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const numberX = this.config.numberPositionX;
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const numberY = this.config.numberPositionY;
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await this.prepareBaseImage();
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const overlay = `
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<svg width="${this.baseImageMetadata.width}" height="${this.baseImageMetadata.height}" xmlns="http://www.w3.org/2000/svg">
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<text x="${numberX}" y="${numberY}" fill="rgb(${numberColor.r},${numberColor.g},${numberColor.b})" font-size="12">${hits}</text>
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</svg>
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`;
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const composite = sharp(this.baseImage).composite([
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{ input: Buffer.from(overlay), gravity: 'northwest' }
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]);
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return composite.toBuffer();
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}
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}
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textPositionY: number; // Y position of the text
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numberPositionX: number; // X position of the number
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numberPositionY: number; // Y position of the number
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fontSize: number; // Font size
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fontFace: string; // Font face
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borderWidth: number; // Border width
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textColorRGB: RGBColor; // Text color
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secondaryTextColorRGB: RGBColor; // Secondary text color
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numberColorRGB: RGBColor; // Number color
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@ -184,12 +275,15 @@ const defaultHitCounterConfig: HitCounterConfig = {
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secondaryText: 'Super cyber, super cool!',
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textPositionX: 5,
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textPositionY: 5,
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numberPositionX: 5,
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numberPositionX: 160,
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numberPositionY: 15,
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fontSize: 12,
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fontFace: 'Arial',
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borderWidth: 3,
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textColorRGB: { r: 253, g: 252, b: 1 },
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secondaryTextColorRGB: { r: 0, g: 255, b: 0 },
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numberColorRGB: { r: 255, g: 255, b: 255 },
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frameColorRGB: { r: 255, g: 238, b: 0 },
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frameColorRGB: { r: 255, g: 0, b: 0 },
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drawFrame: true,
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renderer: ImageHitCounterRenderer
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};
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@ -201,6 +295,7 @@ class HitCounter {
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private preparedGet: Statement;
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private preparedIncrement: Statement;
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private preparedReset: Statement;
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private mimeType: string;
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constructor(renderer: Type<BaseHitCounterRenderer>, config?: HitCounterConfig) {
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this.config = { ...defaultHitCounterConfig, ...config };
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@ -208,6 +303,7 @@ class HitCounter {
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this.openDB();
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this.setupDB();
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this.setupStatements();
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this.mimeType = mimeTypeMap[fileExt(this.config.imageFile)];
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}
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private openDB(): void {
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@ -266,6 +362,14 @@ class HitCounter {
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this.preparedReset.run(this.config.siteId);
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}
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async render(): Promise<any> {
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return this.renderer.render();
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}
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getMimeType(): string {
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return this.mimeType;
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}
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// destructor
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destroy(): void {
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this.closeDB();
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@ -4,18 +4,29 @@ import { HitCounter, ImageHitCounterRenderer } from "./hit-counter";
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const app: Express = express();
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const PORT: number = 8000;
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const hitCounter = new HitCounter(ImageHitCounterRenderer);
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const imageMimeType = hitCounter.getMimeType();
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app.get("/", (req: Request, res: Response) => {
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res.send("Hello World!");
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hitCounter.increment();
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hitCounter.increment();
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res.send("Hello dear interlocutor! Your visit has been noted.");
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});
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app.get("/hits", async (req: Request, res: Response) => {
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const hits = await hitCounter.getHits();
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res.send(`This site has ${hits} hits!`);
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const hits = await hitCounter.getHits();
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res.send(`This site has ${hits} hits!`);
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});
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app.get("/reset", async (req: Request, res: Response) => {
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await hitCounter.reset();
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res.send("Hit counter has been reset!");
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});
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app.get("/image", async (req: Request, res: Response) => {
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const image = await hitCounter.render();
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res.setHeader("Content-Type", imageMimeType);
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res.send(image);
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});
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app.listen(PORT, () => {
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console.log(`[server]: Express server started on port ${PORT}`);
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