io.smallrye.jwt.util.ResourceUtils Maven / Gradle / Ivy
/*
* Copyright 2019 Red Hat, Inc, and individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package io.smallrye.jwt.util;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.net.URL;
public final class ResourceUtils {
public static final String HTTP_BASED_SCHEME = "http";
public static final String CLASSPATH_SCHEME = "classpath:";
public static final String FILE_SCHEME = "file:";
private ResourceUtils() {
}
public static String readResource(String resourceLocation) throws IOException {
return readResource(resourceLocation, null);
}
public static String readResource(String resourceLocation, UrlStreamResolver urlResolver) throws IOException {
InputStream is = getResourceStream(resourceLocation, urlResolver);
if (is == null) {
return null;
}
StringWriter contents = new StringWriter();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(is))) {
String line = null;
while ((line = reader.readLine()) != null) {
contents.write(line);
}
}
return contents.toString();
}
public static InputStream getResourceStream(String resourceLocation) throws IOException {
return getResourceStream(resourceLocation, null);
}
public static InputStream getResourceStream(String resourceLocation, UrlStreamResolver urlResolver) throws IOException {
InputStream is = null;
if (resourceLocation.startsWith(HTTP_BASED_SCHEME)) {
// It can be PEM key at HTTP or HTTPS URL, JWK set at HTTP URL or single JWK at either HTTP or HTTPS URL
is = (urlResolver == null ? getUrlResolver() : urlResolver).resolve(resourceLocation);
} else if (resourceLocation.startsWith(FILE_SCHEME)) {
is = getAsFileSystemResource(resourceLocation.substring(FILE_SCHEME.length()));
} else if (resourceLocation.startsWith(CLASSPATH_SCHEME)) {
is = getAsClasspathResource(resourceLocation.substring(CLASSPATH_SCHEME.length()));
} else {
is = getAsFileSystemResource(resourceLocation);
if (is == null) {
is = getAsClasspathResource(resourceLocation);
}
if (is == null) {
is = getUrlResolver().resolve(resourceLocation);
}
}
return is;
}
public static byte[] readBytes(InputStream is) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int r;
while ((r = is.read(buf)) > 0) {
out.write(buf, 0, r);
}
return out.toByteArray();
}
public static UrlStreamResolver getUrlResolver() {
return new UrlStreamResolver();
}
public static InputStream getAsFileSystemResource(String publicKeyLocation) throws IOException {
try {
return new FileInputStream(publicKeyLocation);
} catch (FileNotFoundException e) {
JWTUtilLogging.log.fileIsNotFound(publicKeyLocation);
return null;
}
}
public static InputStream getAsClasspathResource(String location) {
InputStream is = ResourceUtils.class.getResourceAsStream(location);
if (is == null) {
is = Thread.currentThread().getContextClassLoader().getResourceAsStream(location);
}
return is;
}
public static class UrlStreamResolver {
public InputStream resolve(String keyLocation) throws IOException {
return new URL(keyLocation).openStream();
}
}
}