com.google.firebase.database.utilities.Utilities Maven / Gradle / Ivy
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This is the official Firebase Admin Java SDK. Build extraordinary native JVM apps in
minutes with Firebase. The Firebase platform can power your app’s backend, user
authentication, static hosting, and more.
/*
* Copyright 2017 Google Inc.
*
* 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 com.google.firebase.database.utilities;
import com.google.api.core.ApiFuture;
import com.google.api.core.SettableApiFuture;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Charsets;
import com.google.common.base.Strings;
import com.google.common.io.BaseEncoding;
import com.google.common.net.UrlEscapers;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseException;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.core.Path;
import com.google.firebase.database.core.RepoInfo;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.apache.http.client.utils.URLEncodedUtils;
public class Utilities {
private static final char[] HEX_CHARACTERS = "0123456789abcdef".toCharArray();
public static ParsedUrl parseUrl(String url) throws DatabaseException {
try {
URI uri = URI.create(url);
String scheme = uri.getScheme();
if (scheme == null) {
throw new IllegalArgumentException("Database URL does not specify a URL scheme");
}
String host = uri.getHost();
if (host == null) {
throw new IllegalArgumentException("Database URL does not specify a valid host");
}
RepoInfo repoInfo = new RepoInfo();
repoInfo.host = host.toLowerCase();
repoInfo.secure = scheme.equals("https") || scheme.equals("wss");
int port = uri.getPort();
if (port != -1) {
repoInfo.host += ":" + port;
}
Map params = getQueryParamsMap(uri.getRawQuery());
String namespaceParam = params.get("ns");
if (!Strings.isNullOrEmpty(namespaceParam)) {
repoInfo.namespace = namespaceParam;
} else {
String[] parts = host.split("\\.", -1);
repoInfo.namespace = parts[0].toLowerCase();
}
repoInfo.internalHost = repoInfo.host;
// use raw (encoded) path for backwards compatibility.
String pathString = uri.getRawPath();
pathString = pathString.replace("+", " ");
Validation.validateRootPathString(pathString);
ParsedUrl parsedUrl = new ParsedUrl();
parsedUrl.path = new Path(pathString);
parsedUrl.repoInfo = repoInfo;
return parsedUrl;
} catch (Exception e) {
throw new DatabaseException("Invalid Firebase Database url specified: " + url, e);
}
}
/**
* Extracts a map of query parameters from an encoded query string. Repeated parameters have
* values concatenated with commas.
*
* @param queryString to parse params from. Must be encoded.
* @return map of query parameters and their values.
*/
@VisibleForTesting
static Map getQueryParamsMap(String queryString)
throws UnsupportedEncodingException {
Map paramsMap = new HashMap<>();
if (Strings.isNullOrEmpty(queryString)) {
return paramsMap;
}
String[] paramPairs = queryString.split("&");
for (String paramPair : paramPairs) {
String[] pairParts = paramPair.split("=");
// both the first and second part will be encoded now, we must decode them
String decodedKey = URLDecoder.decode(pairParts[0], Charsets.UTF_8.name());
String decodedValue = URLDecoder.decode(pairParts[1], Charsets.UTF_8.name());
String runningValue = paramsMap.get(decodedKey);
if (Strings.isNullOrEmpty(runningValue)) {
runningValue = decodedValue;
} else {
runningValue += "," + decodedValue;
}
paramsMap.put(pairParts[0], runningValue);
}
return paramsMap;
}
public static String[] splitIntoFrames(String src, int maxFrameSize) {
if (src.length() <= maxFrameSize) {
return new String[] {src};
} else {
ArrayList segs = new ArrayList<>();
for (int i = 0; i < src.length(); i += maxFrameSize) {
int end = Math.min(i + maxFrameSize, src.length());
String seg = src.substring(i, end);
segs.add(seg);
}
return segs.toArray(new String[segs.size()]);
}
}
public static String sha1HexDigest(String input) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.update(input.getBytes("UTF-8"));
byte[] bytes = md.digest();
return BaseEncoding.base64().encode(bytes);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Missing SHA-1 MessageDigest provider.", e);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("UTF-8 encoding is required for Firebase Database to run!");
}
}
public static String stringHashV2Representation(String value) {
String escaped = value;
if (value.indexOf('\\') != -1) {
escaped = escaped.replace("\\", "\\\\");
}
if (value.indexOf('"') != -1) {
escaped = escaped.replace("\"", "\\\"");
}
return '"' + escaped + '"';
}
public static String doubleToHashString(double value) {
StringBuilder sb = new StringBuilder(16);
long bits = Double.doubleToLongBits(value);
// We use big-endian to encode the bytes
for (int i = 7; i >= 0; i--) {
int byteValue = (int) ((bits >>> (8 * i)) & 0xff);
int high = ((byteValue >> 4) & 0xf);
int low = (byteValue & 0xf);
sb.append(HEX_CHARACTERS[high]);
sb.append(HEX_CHARACTERS[low]);
}
return sb.toString();
}
// NOTE: We could use Ints.tryParse from guava, but I don't feel like pulling in guava (~2mb)
// for
// that small purpose.
public static Integer tryParseInt(String num) {
if (num.length() > 11 || num.length() == 0) {
return null;
}
int i = 0;
boolean negative = false;
if (num.charAt(0) == '-') {
if (num.length() == 1) {
return null;
}
negative = true;
i = 1;
}
// long to prevent overflow
long number = 0;
while (i < num.length()) {
char c = num.charAt(i);
if (c < '0' || c > '9') {
return null;
}
number = number * 10 + (c - '0');
i++;
}
if (negative) {
if (-number < Integer.MIN_VALUE) {
return null;
} else {
return (int) (-number);
}
} else {
if (number > Integer.MAX_VALUE) {
return null;
}
return (int) number;
}
}
public static int compareInts(int i, int j) {
if (i < j) {
return -1;
} else if (i == j) {
return 0;
} else {
return 1;
}
}
public static int compareLongs(long i, long j) {
if (i < j) {
return -1;
} else if (i == j) {
return 0;
} else {
return 1;
}
}
@SuppressWarnings("unchecked")
public static C castOrNull(Object o, Class clazz) {
if (clazz.isAssignableFrom(o.getClass())) {
return (C) o;
} else {
return null;
}
}
@SuppressWarnings("rawtypes")
public static C getOrNull(Object o, String key, Class clazz) {
if (o == null) {
return null;
}
Map map = castOrNull(o, Map.class);
Object result = map.get(key);
if (result != null) {
return castOrNull(result, clazz);
} else {
return null;
}
}
public static void hardAssert(boolean condition) {
hardAssert(condition, "");
}
public static void hardAssert(boolean condition, String message) {
if (!condition) {
throw new AssertionError("hardAssert failed: " + message);
}
}
public static Pair, DatabaseReference.CompletionListener> wrapOnComplete(
DatabaseReference.CompletionListener optListener) {
if (optListener == null) {
final SettableApiFuture future = SettableApiFuture.create();
DatabaseReference.CompletionListener listener =
new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError error, DatabaseReference ref) {
if (error != null) {
future.setException(error.toException());
} else {
future.set(null);
}
}
};
return new Pair, DatabaseReference.CompletionListener>(future, listener);
} else {
// If a listener is supplied we do not want to create a Task
return new Pair<>(null, optListener);
}
}
}