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com.rt.storage.auth.oauth2.OAuth2Utils Maven / Gradle / Ivy
package com.rt.storage.auth.oauth2;
import com.rt.storage.api.client.http.HttpHeaders;
import com.rt.storage.api.client.http.HttpTransport;
import com.rt.storage.api.client.http.javanet.NetHttpTransport;
import com.rt.storage.api.client.json.GenericJson;
import com.rt.storage.api.client.json.JsonFactory;
import com.rt.storage.api.client.json.JsonObjectParser;
import com.rt.storage.api.client.json.jackson2.JacksonFactory;
import com.rt.storage.auth.http.AuthHttpConstants;
import com.rt.storage.auth.http.HttpTransportFactory;
import com.google.common.io.ByteStreams;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.net.URI;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.Map;
/** Internal utilities for the com.rt.storage.auth.oauth2 namespace. */
class OAuth2Utils {
static final String SIGNATURE_ALGORITHM = "SHA256withRSA";
static final URI TOKEN_SERVER_URI = URI.create("https://oauth2.googleapis.com/token");
static final URI TOKEN_REVOKE_URI = URI.create("https://oauth2.googleapis.com/revoke");
static final URI USER_AUTH_URI = URI.create("https://accounts.google.com/o/oauth2/auth");
static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
static final HttpTransportFactory HTTP_TRANSPORT_FACTORY = new DefaultHttpTransportFactory();
static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
static final Charset UTF_8 = Charset.forName("UTF-8");
private static String VALUE_NOT_FOUND_MESSAGE = "%sExpected value %s not found.";
private static String VALUE_WRONG_TYPE_MESSAGE = "%sExpected %s value %s of wrong type.";
static final String BEARER_PREFIX = AuthHttpConstants.BEARER + " ";
static class DefaultHttpTransportFactory implements HttpTransportFactory {
public HttpTransport create() {
return HTTP_TRANSPORT;
}
}
/**
* Returns whether the headers contain the specified value as one of the entries in the specified
* header.
*/
static boolean headersContainValue(HttpHeaders headers, String headerName, String value) {
Object values = headers.get(headerName);
if (values instanceof Collection) {
@SuppressWarnings("unchecked")
Collection valuesCollection = (Collection) values;
return valuesCollection.contains(value);
}
return false;
}
/** Parses the specified JSON text. */
static GenericJson parseJson(String json) throws IOException {
JsonObjectParser parser = new JsonObjectParser(OAuth2Utils.JSON_FACTORY);
InputStream stateStream = new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8));
GenericJson stateJson =
parser.parseAndClose(stateStream, StandardCharsets.UTF_8, GenericJson.class);
return stateJson;
}
/** Return the specified string from JSON or throw a helpful error message. */
static String validateString(Map map, String key, String errorPrefix)
throws IOException {
Object value = map.get(key);
if (value == null) {
throw new IOException(String.format(VALUE_NOT_FOUND_MESSAGE, errorPrefix, key));
}
if (!(value instanceof String)) {
throw new IOException(String.format(VALUE_WRONG_TYPE_MESSAGE, errorPrefix, "string", key));
}
return (String) value;
}
/**
* Saves the end user credentials into the given file path.
*
* @param credentials InputStream containing user credentials in JSON format
* @param filePath Path to file where to store the credentials
* @throws IOException An error saving the credentials.
*/
static void writeInputStreamToFile(InputStream credentials, String filePath) throws IOException {
final OutputStream outputStream = new FileOutputStream(new File(filePath));
try {
ByteStreams.copy(credentials, outputStream);
} finally {
outputStream.close();
}
}
/** Return the specified optional string from JSON or throw a helpful error message. */
static String validateOptionalString(Map map, String key, String errorPrefix)
throws IOException {
Object value = map.get(key);
if (value == null) {
return null;
}
if (!(value instanceof String)) {
throw new IOException(String.format(VALUE_WRONG_TYPE_MESSAGE, errorPrefix, "string", key));
}
return (String) value;
}
/** Return the specified integer from JSON or throw a helpful error message. */
static int validateInt32(Map map, String key, String errorPrefix)
throws IOException {
Object value = map.get(key);
if (value == null) {
throw new IOException(String.format(VALUE_NOT_FOUND_MESSAGE, errorPrefix, key));
}
if (value instanceof BigDecimal) {
BigDecimal bigDecimalValue = (BigDecimal) value;
return bigDecimalValue.intValueExact();
}
if (!(value instanceof Integer)) {
throw new IOException(String.format(VALUE_WRONG_TYPE_MESSAGE, errorPrefix, "integer", key));
}
return (Integer) value;
}
/** Return the specified long from JSON or throw a helpful error message. */
static long validateLong(Map map, String key, String errorPrefix)
throws IOException {
Object value = map.get(key);
if (value == null) {
throw new IOException(String.format(VALUE_NOT_FOUND_MESSAGE, errorPrefix, key));
}
if (value instanceof BigDecimal) {
BigDecimal bigDecimalValue = (BigDecimal) value;
return bigDecimalValue.longValueExact();
}
if (!(value instanceof Long)) {
throw new IOException(String.format(VALUE_WRONG_TYPE_MESSAGE, errorPrefix, "long", key));
}
return (Long) value;
}
/** Return the specified map from JSON or throw a helpful error message. */
@SuppressWarnings({"unchecked", "rawtypes"})
static Map validateMap(Map map, String key, String errorPrefix)
throws IOException {
Object value = map.get(key);
if (value == null) {
throw new IOException(String.format(VALUE_NOT_FOUND_MESSAGE, errorPrefix, key));
}
if (!(value instanceof Map)) {
throw new IOException(String.format(VALUE_WRONG_TYPE_MESSAGE, errorPrefix, "Map", key));
}
return (Map) value;
}
private OAuth2Utils() {}
}
