Add catmanga plugin

Author: TheBritishAccent

plugins/catmanga/README.md

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+# Catmanga Plugin
+
+This is the Mango plugin for [Catmanga](https://catmanga.org). 
+
+Note that
+
+- All downloaded chapters will be placed in their respective series folder in your library.
+- Cloudflare rate limits extensive downloads. Adjust `wait_seconds` in `info.json` if you plan to download many chapters in one go (or chapters with many pages).
+
+Maintained by [@TheBritishAccent](https://github.com/TheBritishAccent).

plugins/catmanga/index.js

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+var currentPage = 0;
+var digits = 0;
+var imgURLs;
+
+const ROOT_URL = "https://catmanga.org/";
+
+// Helper function. Builds the API URL since there are no ES6 template strings.
+function buildApiEndpoint(buildID, mangaID, chapterNum) {
+	return ROOT_URL + "_next/data/" + buildID
+	+ "/series/" + mangaID + "/" + chapterNum + ".json";
+}
+
+function listChapters(query) {	
+	// Get API data (stored in a <script> tag in the index html)
+	// We can't use the API directly, since that means already 
+	//	knowing the correct buildID.
+	//
+	// URL in format https://catmanga.org/_next/data/{BUILD-ID}/{ENDPOINT}.json
+	
+	var indexHTML = mango.get(ROOT_URL).body
+	if (!indexHTML) {
+		mango.raise("Failed to get index.")
+	}
+
+	var APINode = mango.css(indexHTML, "script#__NEXT_DATA__")[0];
+
+	if (!APINode) {
+		mango.raise("Failed to get series data.")
+	}
+	
+	var indexJSONString = mango.text(APINode);
+
+	if (!indexJSONString) {
+		mango.raise("An error occured when searching.");
+	}
+
+	var indexJSON = JSON.parse(indexJSONString);
+	var allSeries = indexJSON["props"]["pageProps"]["series"];
+
+	// Search all manga on site to find something that matches query.
+	//	We have to do it manually since Catmanga has no searching.
+	var manga;
+	allSeries.forEach(function(element) {
+		if (query.toLowerCase() == element["title"].toLowerCase() ||
+			query.toLowerCase() == element["series_id"].toLowerCase()) {
+			manga = element;
+		} else {
+			element["alt_titles"].forEach(function(title) {
+				if (title.toLowerCase() == query.toLowerCase()) {
+					manga = element;
+				}
+			});
+		}
+	});
+	
+	if (!manga) {
+		mango.raise("Failed to find manga with title: " + query);
+	}
+
+	var mangaTitle = manga["title"];
+
+	if (!mangaTitle) {
+		mango.raise("Failed to get title of manga.");
+	}
+
+	var chapters = [];
+	manga["chapters"].forEach(function(chapter) {
+		var seriesID = manga["series_id"];
+		var chapterNum = chapter["number"].toString().replace(/\./, "_");
+		var chapterGroups = chapter["groups"].join(", ")
+		
+		var slimObj = {};
+		slimObj["id"] = seriesID + "ch" + chapterNum
+		slimObj["title"] = "Chapter " + chapter["number"];
+		slimObj["groups"] = chapterGroups;
+
+		chapters.push(slimObj);
+	});
+
+	return JSON.stringify({
+		chapters: chapters.reverse(), // Catmanga sorts chapters oldest -> newest
+		title: mangaTitle
+	});
+}
+
+function selectChapter(id) {
+	// Get buildID for chapter	
+	var mangaIDMatch = /(.*?)ch((\d_?)*)$/.exec(id);
+	var mangaID = mangaIDMatch[1];
+	var mangaChapterNumber = mangaIDMatch[2].replace(/\_/, "."); // Convert '_' back to '.
+
+	var chapterReaderURL = ROOT_URL + "series/" + mangaID + "/" + mangaChapterNumber;
+	var chapterHTML = mango.get(chapterReaderURL).body;
+
+	if (!chapterHTML) {
+		mango.raise("Failed to load chapter HTML.");
+	}
+
+	var APINode = mango.css(chapterHTML, "script#__NEXT_DATA__")[0];
+
+	if (!APINode) {
+		mango.raise("Failed to get chapter buildID.")
+	}
+
+	var buildIDJSONString = mango.text(APINode);
+	var buildIDJSON = JSON.parse(buildIDJSONString);
+
+	var buildID = buildIDJSON["buildId"];
+
+	// Get manga images from API
+	var mangaURL = buildApiEndpoint(buildID, mangaID, mangaChapterNumber);
+	var mangaJSONString = mango.get(mangaURL).body;
+
+	if (!mangaJSONString) {
+		mango.raise("Failed to load chapter.");
+	}
+
+	var mangaJSON = JSON.parse(mangaJSONString);
+	
+	var chapterTitle = "Chapter " + mangaJSON["pageProps"]["chapter"]["number"];
+
+	if (!chapterTitle) {
+		mango.raise("Failed to get chapter title.");
+	}
+
+	imgURLs = mangaJSON["pageProps"]["pages"];
+	currentPage = 0;
+	digits = Math.floor(Math.log10(imgURLs.length)) + 1;
+
+	return JSON.stringify({
+		title: chapterTitle,
+		pages: imgURLs.length
+	});
+}
+
+function nextPage() {
+	if (currentPage >= imgURLs.length) {
+		return JSON.stringify({});
+	}
+	
+	var url = imgURLs[currentPage]
+	var filename = pad(currentPage, digits) + '.' + /\.(\w+)$/.exec(url)[0];
+
+	currentPage += 1;
+	return JSON.stringify({
+		url: url,
+		filename: filename,
+		headers: {
+			'referer': "https://catmanga.org"
+		}
+	});
+}
+
+// https://stackoverflow.com/a/10073788
+function pad(n, width, z) {
+	z = z || '0';
+	n = n + '';
+	return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
+}

plugins/catmanga/info.json

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+{
+	"id": "Catmanga",
+	"title": "Catmanga",
+	"author": "TheBritishAccent - [email protected]",
+	"version": "v1.0",
+	"placeholder": "Enter a full manga title to search Catmanga",
+	"wait_seconds": 1
+}