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// TODO: refactor
import { AnyNode, Cheerio, load } from "cheerio"; // rustified
import { ScrapeOptions } from "../../../controllers/v1/types";
import { transformHtml } from "../../../lib/html-transformer";
import { logger } from "../../../lib/logger";
const excludeNonMainTags = [
"header",
"footer",
"nav",
"aside",
".header",
".top",
".navbar",
"#header",
".footer",
".bottom",
"#footer",
".sidebar",
".side",
".aside",
"#sidebar",
".modal",
".popup",
"#modal",
".overlay",
".ad",
".ads",
".advert",
"#ad",
".lang-selector",
".language",
"#language-selector",
".social",
".social-media",
".social-links",
"#social",
".menu",
".navigation",
"#nav",
".breadcrumbs",
"#breadcrumbs",
".share",
"#share",
".widget",
"#widget",
".cookie",
"#cookie",
];
const forceIncludeMainTags = [
"#main",
".swoogo-cols",
".swoogo-text",
".swoogo-table-div",
".swoogo-space",
".swoogo-alert",
".swoogo-sponsors",
".swoogo-title",
".swoogo-tabs",
".swoogo-logo",
".swoogo-image",
".swoogo-button",
".swoogo-agenda"
];
export const htmlTransform = async (
html: string,
url: string,
scrapeOptions: ScrapeOptions,
) => {
try {
return await transformHtml({
html,
url,
include_tags: (scrapeOptions.includeTags ?? []).map(x => x.trim()).filter((x) => x.length !== 0),
exclude_tags: (scrapeOptions.excludeTags ?? []).map(x => x.trim()).filter((x) => x.length !== 0),
only_main_content: scrapeOptions.onlyMainContent,
})
} catch (error) {
logger.warn("Failed to call html-transformer! Falling back to cheerio...", {
error,
module: "scrapeURL", method: "extractLinks"
});
}
let soup = load(html);
// remove unwanted elements
if (
scrapeOptions.includeTags &&
scrapeOptions.includeTags.filter((x) => x.trim().length !== 0).length > 0
) {
// Create a new root element to hold the tags to keep
const newRoot = load("<div></div>")("div");
scrapeOptions.includeTags.forEach((tag) => {
soup(tag).each((_, element) => {
newRoot.append(soup(element).clone());
});
});
soup = load(newRoot.html() ?? "");
}
soup("script, style, noscript, meta, head").remove();
if (
scrapeOptions.excludeTags &&
scrapeOptions.excludeTags.filter((x) => x.trim().length !== 0).length > 0
) {
scrapeOptions.excludeTags.forEach((tag) => {
let elementsToRemove: Cheerio<AnyNode>;
if (tag.startsWith("*") && tag.endsWith("*")) {
let classMatch = false;
const regexPattern = new RegExp(tag.slice(1, -1), "i");
elementsToRemove = soup("*").filter((i, element) => {
if (element.type === "tag") {
const attributes = element.attribs;
const tagNameMatches = regexPattern.test(element.name);
const attributesMatch = Object.keys(attributes).some((attr) =>
regexPattern.test(`${attr}="${attributes[attr]}"`),
);
if (tag.startsWith("*.")) {
classMatch = Object.keys(attributes).some((attr) =>
regexPattern.test(`class="${attributes[attr]}"`),
);
}
return tagNameMatches || attributesMatch || classMatch;
}
return false;
});
} else {
elementsToRemove = soup(tag);
}
elementsToRemove.remove();
});
}
if (scrapeOptions.onlyMainContent) {
excludeNonMainTags.forEach((tag) => {
const elementsToRemove = soup(tag).filter(
forceIncludeMainTags.map((x) => ":not(:has(" + x + "))").join(""),
);
elementsToRemove.remove();
});
}
// always return biggest image
soup("img[srcset]").each((_, el) => {
const sizes = el.attribs.srcset.split(",").map((x) => {
const tok = x.trim().split(" ");
return {
url: tok[0],
size: parseInt((tok[1] ?? "1x").slice(0, -1), 10),
isX: (tok[1] ?? "").endsWith("x"),
};
});
if (sizes.every((x) => x.isX) && el.attribs.src) {
sizes.push({
url: el.attribs.src,
size: 1,
isX: true,
});
}
sizes.sort((a, b) => b.size - a.size);
el.attribs.src = sizes[0]?.url;
});
// absolute links
soup("img[src]").each((_, el) => {
try {
el.attribs.src = new URL(el.attribs.src, url).href;
} catch (_) {}
});
soup("a[href]").each((_, el) => {
try {
el.attribs.href = new URL(el.attribs.href, url).href;
} catch (_) {}
});
const cleanedHtml = soup.html();
return cleanedHtml;
};
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