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/*******************************************************************************
* Copyright (c) 2011, 2017 The Eclipse Foundation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* The Eclipse Foundation - initial API and implementation
* Ian Pun - factored out of RepositorySelectionPage
*******************************************************************************/
package org.eclipse.egit.ui.internal.clone;
import java.net.URISyntaxException;
import org.eclipse.egit.ui.internal.KnownHosts;
import org.eclipse.egit.ui.internal.components.RepositorySelectionPage.Protocol;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.transport.Transport;
import org.eclipse.jgit.transport.TransportProtocol;
import org.eclipse.jgit.transport.URIish;
/**
* Utility class for checking strings for being valid git URLs, and for
* sanitizing arbitrary string input.
*/
public abstract class GitUrlChecker {
private static final String GIT_CLONE_COMMAND_PREFIX = "git clone "; //$NON-NLS-1$
/**
* Checks if the incoming string is a valid git URL. It is recommended to
* {@link #sanitizeAsGitUrl(String) sanitize} the String first if coming
* from an untrustworthy source.
*
* @param url
* to check
* @return {@code true} if the {@code url} is a valid git URL, {@code false}
* otherwise
*/
public static boolean isValidGitUrl(String url) {
try {
if (url != null) {
URIish u = new URIish(url);
if (canHandleProtocol(u)) {
if (Protocol.GIT.handles(u) || Protocol.SSH.handles(u)
|| (Protocol.HTTP.handles(u)
|| Protocol.HTTPS.handles(u))
&& KnownHosts.isKnownHost(u.getHost())
|| url.endsWith(Constants.DOT_GIT_EXT)) {
return true;
}
}
}
} catch (URISyntaxException e) {
// Ignore. This is used to check arbitrary input for being a
// possibly valid git URL; we don't want to flood the log here.
}
return false;
}
/**
* Sanitize a string for use as a git URL. Strips the Git Clone command if
* needed and reduces remaining the input to anything before the first
* whitespace.
*
* @param input
* String to be sanitized
* @return sanitized string; if the input came from an untrustworthy source,
* is should still be checked using {@link #isValidGitUrl(String)}
* before being used for real as a git URL
*/
public static String sanitizeAsGitUrl(String input) {
String sanitized = input.trim();
if (sanitized.startsWith(GIT_CLONE_COMMAND_PREFIX)) {
sanitized = sanitized.substring(GIT_CLONE_COMMAND_PREFIX.length())
.trim();
}
// Take only the part up to the first whitespace character
return sanitized.split("[\\h|\\v]", 2)[0]; //$NON-NLS-1$
}
private static boolean canHandleProtocol(URIish u) {
for (TransportProtocol proto : Transport.getTransportProtocols()) {
if (proto.canHandle(u)) {
return true;
}
}
return false;
}
}
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