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package com.sun.jersey.server.impl.uri;
import javax.ws.rs.core.UriBuilder;
import java.net.URI;
import java.util.LinkedList;
import java.util.List;
/**
* URI helper.
*
* @author Jakub Podlesak (japod at sun dot com)
* @author Yegor Bugayenko ([email protected])
*/
public final class UriHelper {
/**
* Normalize the URI provided and return the normalized
* copy.
* @param uri The URI to normalize
* @param preserveContdSlashes Shall we preserve "///" slashes
* @return New normalized URI
*/
public static URI normalize(URI uri, boolean preserveContdSlashes) {
if (!uri.getRawPath().contains("//")) {
return uri.normalize();
}
String np = UriHelper.removeDotSegments(
uri.getRawPath(),
preserveContdSlashes
);
if (np.equals(uri.getRawPath())) {
return uri;
}
return UriBuilder.fromUri(uri).replacePath(np).build();
}
/**
* Removal of leading slashes from the path.
* @param path The path
* @param preserveSlashes Shall we do anything?
* @return Path without any leading slashes
* @todo A better algorithm is required. Maybe we can use Apache StringUtils?
* @see #normalize(URI, boolean)
*/
private static String removeLeadingSlashesIfNeeded(
final String path, final boolean preserveSlashes) {
if (preserveSlashes) {
return path;
}
String trimmed = path;
while (trimmed.startsWith("/")) {
trimmed = trimmed.substring(1);
}
return trimmed;
}
/**
* Remove dots from path.
*
* alg taken from http://gbiv.com/protocols/uri/rfc/rfc3986.html#relative-dot-segments
* the alg works as follows:
* 1. The input buffer is initialized with the now-appended path components and the output buffer is initialized to the empty string.
* 2. While the input buffer is not empty, loop as follows:
* A. If the input buffer begins with a prefix of "../" or "./", then remove that prefix from the input buffer; otherwise,
* B. if the input buffer begins with a prefix of "/./"
* or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer; otherwise,
* C. if the input buffer begins with a prefix of "/../"
* or "/..", where ".." is a complete path segment,
* then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise,
* D. if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise,
* E. move the first path segment in the input buffer to the end of the output buffer,
* including the initial "/" character (if any) and any subsequent characters up to, but not including,
* the next "/" character or the end of the input buffer.
* 3. Finally, the output buffer is returned as the result of remove_dot_segments.
*
* @param path Path provided
* @param preserveContdSlashes Shall we preserve "///" slashes
* @return New path
*/
public static String removeDotSegments(String path, boolean preserveContdSlashes) {
if (null == path) {
return null;
}
final List outputSegments = new LinkedList();
while (path.length() > 0) {
if (path.startsWith("../")) { // rule 2A
path = removeLeadingSlashesIfNeeded(path.substring(3), preserveContdSlashes);
} else if (path.startsWith("./")) { // rule 2A
path = removeLeadingSlashesIfNeeded(path.substring(2), preserveContdSlashes);
} else if (path.startsWith("/./")) { // rule 2B
path = "/" + removeLeadingSlashesIfNeeded(path.substring(3), preserveContdSlashes);
} else if ("/.".equals(path)) { // rule 2B
path = "/";
} else if (path.startsWith("/../")) { // rule 2C
path = "/" + removeLeadingSlashesIfNeeded(path.substring(4), preserveContdSlashes);
if(!outputSegments.isEmpty()) { // removing last segment if any
outputSegments.remove(outputSegments.size() - 1);
}
} else if ("/..".equals(path)) { // rule 2C
path = "/";
if(!outputSegments.isEmpty()) { // removing last segment if any
outputSegments.remove(outputSegments.size() - 1);
}
} else if ("..".equals(path) || ".".equals(path)) { // rule 2D
path = "";
} else { // rule E
int slashStartSearchIndex;
if (path.startsWith("/")) {
path = "/" + removeLeadingSlashesIfNeeded(path.substring(1), preserveContdSlashes);
slashStartSearchIndex = 1;
} else {
slashStartSearchIndex = 0;
}
int segLength = path.indexOf('/', slashStartSearchIndex);
if (-1 == segLength) {
segLength = path.length();
}
outputSegments.add(path.substring(0, segLength));
path = path.substring(segLength);
}
}
final StringBuffer result = new StringBuffer();
for (String segment : outputSegments) {
result.append(segment);
}
return result.toString();
}
}
