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index.js
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index.js
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const fs = require("fs");
const axios = require("axios");
const chalk = require("chalk");
const striptags = require("striptags");
const entities = require("html-entities");
// const entities = new Entities()
const { from, iif, defer, of } = require("rxjs");
const {
takeWhile,
map,
tap,
catchError,
mergeMap,
mergeAll,
} = require("rxjs/operators");
// user
const DEBUG = true; // be verbose
const RECIPES_OUTPUT_DIR = "./recipes"; // store recipes here
const MAX_RECIPES_CATEGORY = 100000; // limit recipes per category
const MAX_RECIPES = 1000000; // limit recipes in general
const INGREDIENTS_PORTIONS = 1; // calculate ingredients by portions
// technical
const BASE_URL = "https://www.chefkoch.de";
const CONCURRENT_REQUESTS = 1;
// logging
const red = (msg) => console.log(chalk.red(msg));
const green = (msg) => console.log(chalk.green(msg));
const yellow = (msg) => console.log(chalk.yellow(msg));
const magenta = (msg) => console.log(chalk.magenta(msg));
const r$ = (url) => {
const regex = new RegExp(`^${BASE_URL}`, "gm");
url = `${BASE_URL}${url.replace(regex, "")}`;
return defer(() => {
yellow(`downloading ${chalk.blue.underline(url)}`);
return from(axios.get(url));
});
};
// get topmost categories & categories-name
const parseCategories = ({ data }) => {
if (DEBUG) magenta("parsing category-url´s");
const regex =
/<div class="category-level-2">\n\s*<a href="(.+?)".*".*Vorspeisen Rezepte.*>(.+?)<\/a>/gm;
const match = data.matchAll(regex);
const urls = [...match].map((x) => [x[2], x[1]]);
if (DEBUG) urls.forEach(([name, url]) => green(`--> ${name}: ${url}`));
// TODO Malte
const foo = [["Nudeln", "https://www.chefkoch.de/rs/s0t24/Nudeln-Rezepte.html"], ["Hauptspeisen", "https://www.chefkoch.de/rs/s0t21/Hauptspeise-Rezepte.html"]]
// return urls; // ["category-name", "url"]
return foo; // ["category-name", "url"]
};
const generatePagedUrls = ([url, count]) => {
const step = 30; // chefkoch displays 30 recipes per page
const limitPages = Math.ceil(MAX_RECIPES_CATEGORY / step);
const pages = Math.min(limitPages, Math.floor(count / step));
const urls = [];
for (let i = 0; i <= pages; i++) {
urls.push(url.replace(/(^\/rs\/s)0(.+)$/m, `$1${i * step}$2`));
}
return urls;
};
const parseRecipeResultsCount = ({ request, data }) => {
if (DEBUG)
magenta(`parsing recipe count for ${chalk.blue.underline(request.path)}`);
const regex = /<span class="ds-text-category">(.*) Rezepte<\/span>/gm;
const match = data.matchAll(regex);
const count = Number([...match][0][1].replace(".", ""));
if (DEBUG) green(`--> ${count}`);
return [request.path, count]; // ex. ["/rs/s0g53/saisonale-Rezepte.html", 901133]
};
const parseRecipeUrls = ({ request, data }) => {
if (DEBUG)
magenta(`parsing recipe urls for ${chalk.blue.underline(request.path)}`);
const regex =
/<a href="(https:\/\/www\.chefkoch\.de\/rezepte\/(\d+)\/[^"]+)"/gm;
const match = data.matchAll(regex);
const urls = [...match].map(([, url, id]) => [
id,
`${url}?portionen=${INGREDIENTS_PORTIONS}`,
]); // [recipe-id, recipe-url]
if (DEBUG) urls.forEach(([id, url]) => green(`--> ${id}: ${url}`));
return urls;
};
const storeRecipe = ([id, json]) => {
if (!json) return [];
const fileName = `${RECIPES_OUTPUT_DIR}/${id}.json`;
fs.writeFileSync(fileName, JSON.stringify(json, null, 2));
if (DEBUG) green(`--> stored ${fileName}`);
return { id, fileName, title: json.title };
};
const parseRecipe = ({ request, data }) => {
if (DEBUG)
magenta(`parsing recipe for ${chalk.blue.underline(request.path)}`);
const header = data.match(
/<article.*?recipe-header.*?>(.*?)<\/article>/gs
)[0];
const id = [...request.path.matchAll(/rezepte\/(\d+)/gs)][0][1];
const title = [...data.matchAll(/<h1.*>(.+)<\/h1>/gs)][0][1];
const dateMatch = [
...header.matchAll(/<span class="recipe-date">.*?<\/i>(.*?)<\/span>/gs),
][0];
const prepTimeMatch = [
...header.matchAll(/<span class="recipe-preptime">.*?<\/i>(.*?)<\/span>/gs),
][0];
const difficultyMatch = [
...header.matchAll(
/<span class="recipe-difficulty">.*?<\/i>(.*?)<\/span>/gs
),
][0];
const kcaloriesMatch = [
...header.matchAll(
/<span class="recipe-kcalories">.*?<\/i>(.*?)<\/span>/gs
),
][0];
const json = {
id,
title,
date: dateMatch && dateMatch[1].trim(),
prepTime: prepTimeMatch && prepTimeMatch[1].trim(),
difficulty: difficultyMatch && difficultyMatch[1].trim(),
kcalories: kcaloriesMatch && kcaloriesMatch[1].trim(),
categories: parseRecipeCategories(data),
tags: parseRecipeTags(header),
ingredients: parseRecipeIngredients(data),
image: parseImage(data),
instructions: parseInstructions(data),
};
return [id, json];
};
const parseRecipeCategories = (body) => {
const match = body.match(/<nav aria-label="Breadcrumb".*?>(.*?)<\/nav>/gs);
const matches = match[0].matchAll(/<span itemprop="name">(.*?)<\/span>/gs);
const categories = [...matches]
.map(([, name]) => name)
.map((name) => entities.decode(name));
// cut off first 3 breadcrumbs
return categories.slice(3);
};
const parseRecipeTags = (header) => {
const matches = header.matchAll(
/<a href="\/rs\/s0t(.+?)\/.*?".*?bi-tags.*?>(.*?)<\/a>/gs
);
const tags = [...matches].map(([, id, name]) => [
id,
entities.decode(name).trim(),
]);
return tags;
};
const parseRecipeIngredients = (body) => {
const tableMatch = body.match(/<table.*?ingredients.*?>(.*?)<\/table>/gs)[0];
const ingredientMatches = [
...tableMatch.matchAll(
/<tr>.*?td-left.*?<span>(.*?)<\/span>.*?td-right.*?<span>(.*?)<\/span>.*?<\/tr>/gs
),
];
const ingredients = ingredientMatches.map(([, amount, ingredient]) => {
const amounts = amount.trim().split(" "); // you funky chefkoch, you
return [striptags(ingredient).trim(), ...amounts];
});
return ingredients;
};
const parseImage = (body) => {
const match = body.match(
/https:\/\/img.chefkoch-cdn\.de\/rezepte\/(?:.*)\/bilder\/(?:.*)\/crop-960x720\//m
);
return match && match[0];
};
const parseInstructions = (body) => {
const match = body.match(/recipeInstructions": "(.*)"/m);
return match && JSON.parse(`"${match[1]}"`);
};
const handleError = (e) => {
red(`error: ${e.message}`);
return of({ error: e.message });
};
const start = () => {
if (DEBUG) magenta(`create directory "${RECIPES_OUTPUT_DIR}"`);
fs.mkdirSync(RECIPES_OUTPUT_DIR, { recursive: true });
let recipesCount = 0;
const recipeIndexes = {};
r$("/rezepte")
.pipe(
map(parseCategories), // [category-name, url]
mergeMap((x) => from(x)), // make 1 stream per category-url
map(([, url]) => r$(url)), // request 1st category-page
mergeAll(1), // limit concurrent requests
map(parseRecipeResultsCount), // [url, count]
map(generatePagedUrls), // [url, url, ...]
mergeMap((x) => from(x)), // make 1 stream per paged category-url
map((url) => r$(url)), // request paged category-url
mergeAll(1), // limit concurrent requests
map(parseRecipeUrls), // [recipe-id, recipe-url]
mergeMap((x) => from(x)), // make 1 stream per recipe-url
tap(([id]) => (recipeIndexes[id] = recipesCount++)), // we store the index of the recipe
map(([id, url]) =>
iif(() => !fs.existsSync(`${RECIPES_OUTPUT_DIR}/${id}.json`), r$(url))
), // download recipe only if not already exists
mergeAll(CONCURRENT_REQUESTS), // limit concurrent requests
map(parseRecipe), // [id, json]
map(storeRecipe), // [id, fileName]
catchError(handleError), // handle any error
takeWhile(() => recipesCount < MAX_RECIPES)
)
.subscribe(
({ id, title, error }) => {
!error &&
green(`--> finished recipe ${recipeIndexes[id]}: ${title} [${id}]`);
error && red(`--> error: ${error}`);
delete recipeIndexes[id]; // keep dictionary small
},
(e) => {
red(`error: ${e.message}`);
}
);
};
start();