functions.js
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	/**
	* Copyright (C) 2018-2020 The Software Heritage developers
	* See the AUTHORS file at the top-level directory of this distribution
	* License: GNU Affero General Public License version 3, or any later version
	* See top-level LICENSE file for more information
	*/

	// utility functions

	import Cookies from 'js-cookie';

	export function handleFetchError(response) {
	if (!response.ok) {
	throw response;
	}
	return response;
	}

	export function handleFetchErrors(responses) {
	for (let i = 0; i < responses.length; ++i) {
	if (!responses[i].ok) {
	throw responses[i];
	}
	}
	return responses;
	}

	export function staticAsset(asset) {
	return `${__STATIC__}${asset}`;
	}

	export function csrfPost(url, headers = {}, body = null) {
	headers['X-CSRFToken'] = Cookies.get('csrftoken');
	return fetch(url, {
	credentials: 'include',
	headers: headers,
	method: 'POST',
	body: body
	});
	}

	export function isGitRepoUrl(url, pathPrefix = '/') {
	const allowedProtocols = ['http:', 'https:', 'git:'];
	if (allowedProtocols.find(protocol => protocol === url.protocol) === undefined) {
	return false;
	}
	if (!url.pathname.startsWith(pathPrefix)) {
	return false;
	}
	const re = new RegExp('[\\w\\.-]+\\/?(?!=.git)(?:\\.git\\/?)?$');
	return re.test(url.pathname.slice(pathPrefix.length));
	};

	export function removeUrlFragment() {
	history.replaceState('', document.title, window.location.pathname + window.location.search);
	}

	export function selectText(startNode, endNode) {
	const selection = window.getSelection();
	selection.removeAllRanges();
	const range = document.createRange();
	range.setStart(startNode, 0);
	if (endNode.nodeName !== '#text') {
	range.setEnd(endNode, endNode.childNodes.length);
	} else {
	range.setEnd(endNode, endNode.textContent.length);
	}
	selection.addRange(range);
	}

	export function htmlAlert(type, message, closable = false) {
	let closeButton = '';
	let extraClasses = '';
	if (closable) {
	closeButton =
	`<button type="button" class="close" data-dismiss="alert" aria-label="Close">
	<span aria-hidden="true">×</span>
	</button>`;
	extraClasses = 'alert-dismissible';
	}
	return `<div class="alert alert-${type} ${extraClasses}" role="alert">${message}${closeButton}</div>`;
	}

	export function isValidURL(string) {
	try {
	new URL(string);
	} catch (_) {
	return false;
	}
	return true;
	}

	export async function isArchivedOrigin(originPath) {
	if (!isValidURL(originPath)) {
	// Not a valid URL, return immediately
	return false;
	} else {
	const response = await fetch(Urls.api_1_origin(originPath));
	return response.ok && response.status === 200; // Success response represents an archived origin
	}
	}

	export async function getCanonicalOriginURL(originUrl) {
	let originUrlLower = originUrl.toLowerCase();
	// github.com URL processing
	const ghUrlRegex = /^http[s]*:\/\/github.com\//;
	if (originUrlLower.match(ghUrlRegex)) {
	// remove trailing .git
	if (originUrlLower.endsWith('.git')) {
	originUrlLower = originUrlLower.slice(0, -4);
	}
	// remove trailing slash
	if (originUrlLower.endsWith('/')) {
	originUrlLower = originUrlLower.slice(0, -1);
	}
	// extract {owner}/{repo}
	const ownerRepo = originUrlLower.replace(ghUrlRegex, '');
	// fetch canonical URL from github Web API
	const ghApiResponse = await fetch(`https://api.github.com/repos/${ownerRepo}`);
	if (ghApiResponse.ok && ghApiResponse.status === 200) {
	const ghApiResponseData = await ghApiResponse.json();
	return ghApiResponseData.html_url;
	}
	}
	return originUrl;
	}

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