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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you 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 org.openqa.selenium.json;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import com.google.common.collect.ImmutableMap;
import org.openqa.selenium.logging.LogLevelMapping;
import org.openqa.selenium.remote.SessionId;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URI;
import java.net.URL;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Date;
import java.util.Deque;
import java.util.Map;
import java.util.Objects;
import java.util.UUID;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Stream;
public class JsonOutput implements Closeable {
private static final Logger LOG = Logger.getLogger(JsonOutput.class.getName());
private static final int MAX_DEPTH = 5;
private static final Predicate> GSON_ELEMENT;
static {
Predicate> gsonElement;
try {
Class elementClass = Class.forName("com.google.gson.JsonElement");
gsonElement = elementClass::isAssignableFrom;
} catch (ReflectiveOperationException e) {
gsonElement = clazz -> false;
}
GSON_ELEMENT = gsonElement;
}
// https://www.json.org has some helpful comments on characters to escape
// See also https://tools.ietf.org/html/rfc8259#section-7 and
// https://github.com/google/gson/issues/341 so we escape those as well.
// It's legal to escape any character, so to be nice to HTML parsers,
// we'll also escape "<" and "&"
private static final Map ESCAPES;
static {
ImmutableMap.Builder builder = ImmutableMap.builder();
for (int i = 0; i <= 0x1f; i++) {
// We want nice looking escapes for these, which are called out
// by json.org
if (!(i == '\b' || i == '\f' || i == '\n' || i == '\r' || i == '\t')) {
builder.put(i, String.format("\\u%04x", i));
}
}
builder.put((int) '"', "\\\"");
builder.put((int) '\\', "\\\\");
builder.put((int) '/', "\\u002f");
builder.put((int) '\b', "\\b");
builder.put((int) '\f', "\\f");
builder.put((int) '\n', "\\n");
builder.put((int) '\r', "\\r");
builder.put((int) '\t', "\\t");
builder.put((int) '\u2028', "\\u2028");
builder.put((int) '<', String.format("\\u%04x", (int) '<'));
builder.put((int) '&', String.format("\\u%04x", (int) '&'));
ESCAPES = builder.build();
}
private final Map>, SafeBiConsumer> converters;
private final Appendable appendable;
private final Consumer appender;
private Deque stack;
private String indent = "";
private String lineSeparator = "\n";
private String indentBy = " ";
JsonOutput(Appendable appendable) {
this.appendable = Objects.requireNonNull(appendable);
this.appender =
str -> {
try {
appendable.append(str);
} catch (IOException e) {
throw new JsonException("Unable to write to underlying appendable", e);
}
};
this.stack = new ArrayDeque<>();
this.stack.addFirst(new Empty());
// Order matters, since we want to handle null values first to avoid exceptions, and then then
// common kinds of inputs next.
this.converters = ImmutableMap.>, SafeBiConsumer>builder()
.put(Objects::isNull, (obj, depth) -> append("null"))
.put(CharSequence.class::isAssignableFrom, (obj, depth) -> append(asString(obj)))
.put(Number.class::isAssignableFrom, (obj, depth) -> append(obj.toString()))
.put(Boolean.class::isAssignableFrom, (obj, depth) -> append((Boolean) obj ? "true" : "false"))
.put(Date.class::isAssignableFrom, (obj, depth) -> append(String.valueOf(MILLISECONDS.toSeconds(((Date) obj).getTime()))))
.put(Enum.class::isAssignableFrom, (obj, depth) -> append(asString(obj)))
.put(File.class::isAssignableFrom, (obj, depth) -> append(((File) obj).getAbsolutePath()))
.put(URI.class::isAssignableFrom, (obj, depth) -> append(asString((obj).toString())))
.put(URL.class::isAssignableFrom, (obj, depth) -> append(asString(((URL) obj).toExternalForm())))
.put(UUID.class::isAssignableFrom, (obj, depth) -> append(asString(((UUID) obj).toString())))
.put(Level.class::isAssignableFrom, (obj, depth) -> append(asString(LogLevelMapping.getName((Level) obj))))
.put(SessionId.class::isAssignableFrom, (obj, depth) -> append(asString(obj)))
.put(
GSON_ELEMENT,
(obj, depth) -> {
LOG.log(
Level.WARNING,
"Attempt to convert JsonElement from GSON. This functionality is deprecated. "
+ "Diagnostic stacktrace follows",
new JsonException("Stack trace to determine cause of warning"));
append(obj.toString());
})
// Special handling of asMap and toJson
.put(
cls -> getMethod(cls, "toJson") != null,
(obj, depth) -> convertUsingMethod("toJson", obj, depth))
.put(
cls -> getMethod(cls, "asMap") != null,
(obj, depth) -> convertUsingMethod("asMap", obj, depth))
.put(
cls -> getMethod(cls, "toMap") != null,
(obj, depth) -> convertUsingMethod("toMap", obj, depth))
// And then the collection types
.put(
Collection.class::isAssignableFrom,
(obj, depth) -> {
beginArray();
((Collection) obj).forEach(o -> write(o, depth - 1));
endArray();
})
.put(
Map.class::isAssignableFrom,
(obj, depth) -> {
beginObject();
((Map) obj).forEach(
(key, value) -> name(String.valueOf(key)).write(value, depth - 1));
endObject();
})
.put(
Class::isArray,
(obj, depth) -> {
beginArray();
Stream.of((Object[]) obj).forEach(o -> write(o, depth - 1));
endArray();
})
// Finally, attempt to convert as an object
.put(cls -> true, (obj, depth) -> mapObject(obj, depth - 1))
.build();
}
public JsonOutput setPrettyPrint(boolean enablePrettyPrinting) {
this.lineSeparator = enablePrettyPrinting ? "\n" : "";
this.indentBy = enablePrettyPrinting ? " " : "";
return this;
}
public JsonOutput beginObject() {
stack.getFirst().write("{" + lineSeparator);
indent += indentBy;
stack.addFirst(new JsonObject());
return this;
}
public JsonOutput name(String name) {
if (!(stack.getFirst() instanceof JsonObject)) {
throw new JsonException("Attempt to write name, but not writing a json object: " + name);
}
((JsonObject) stack.getFirst()).name(name);
return this;
}
public JsonOutput endObject() {
Node topOfStack = stack.getFirst();
if (!(topOfStack instanceof JsonObject)) {
throw new JsonException("Attempt to close a json object, but not writing a json object");
}
stack.removeFirst();
indent = indent.substring(0, indent.length() - indentBy.length());
if (topOfStack.isEmpty) {
appender.accept(indent + "}");
} else {
appender.accept(lineSeparator + indent + "}");
}
return this;
}
public JsonOutput beginArray() {
append("[" + lineSeparator);
indent += " ";
stack.addFirst(new JsonCollection());
return this;
}
public JsonOutput endArray() {
Node topOfStack = stack.getFirst();
if (!(topOfStack instanceof JsonCollection)) {
throw new JsonException("Attempt to close a json array, but not writing a json array");
}
stack.removeFirst();
indent = indent.substring(0, indent.length() - indentBy.length());
if (topOfStack.isEmpty) {
appender.accept(indent + "]");
} else {
appender.accept(lineSeparator + indent + "]");
}
return this;
}
public JsonOutput write(Object value) {
return write(value, MAX_DEPTH);
}
public JsonOutput write(Object input, int depthRemaining) {
converters.entrySet().stream()
.filter(entry -> entry.getKey().test(input == null ? null : input.getClass()))
.findFirst()
.map(Map.Entry::getValue)
.orElseThrow(() -> new JsonException("Unable to write " + input))
.consume(input, depthRemaining);
return this;
}
@Override
public void close() {
if (appendable instanceof Closeable) {
try {
((Closeable) appendable).close();
} catch (IOException e) {
throw new JsonException(e);
}
}
if (!(stack.getFirst() instanceof Empty)) {
throw new JsonException("Attempting to close incomplete json stream");
}
}
private JsonOutput append(String text) {
stack.getFirst().write(text);
return this;
}
private String asString(Object obj) {
StringBuilder toReturn = new StringBuilder("\"");
String.valueOf(obj)
.chars()
.mapToObj(i -> ESCAPES.getOrDefault(i, "" + (char) i))
.forEach(toReturn::append);
toReturn.append('"');
return toReturn.toString();
}
private Method getMethod(Class clazz, String methodName) {
if (Object.class.equals(clazz)) {
return null;
}
try {
Method method = clazz.getDeclaredMethod(methodName);
method.setAccessible(true);
return method;
} catch (NoSuchMethodException e) {
return getMethod(clazz.getSuperclass(), methodName);
} catch (SecurityException e) {
throw new JsonException(
"Unable to find the method because of a security constraint: " + methodName,
e);
}
}
private JsonOutput convertUsingMethod(String methodName, Object toConvert, int depth) {
try {
Method method = getMethod(toConvert.getClass(), methodName);
if (method == null) {
throw new JsonException(String.format(
"Unable to read object %s using method %s",
toConvert,
methodName));
}
Object value = method.invoke(toConvert);
return write(value, depth);
} catch (ReflectiveOperationException e) {
throw new JsonException(e);
}
}
private void mapObject(Object toConvert, int maxDepth) {
if (maxDepth < 1) {
append("null");
return;
}
if (toConvert instanceof Class) {
write(((Class) toConvert).getName());
return;
}
// Raw object via reflection? Nope, not needed
beginObject();
for (SimplePropertyDescriptor pd :
SimplePropertyDescriptor.getPropertyDescriptors(toConvert.getClass())) {
// Only include methods not on java.lang.Object to stop things being super-noisy
Function readMethod = pd.getReadMethod();
if (readMethod == null) {
continue;
}
name(pd.getName());
write(pd.getReadMethod().apply(toConvert), maxDepth - 1);
}
endObject();
}
private class Node {
protected boolean isEmpty = true;
public void write(String text) {
if (isEmpty) {
isEmpty = false;
} else {
appender.accept("," + lineSeparator);
}
appender.accept(indent);
appender.accept(text);
}
}
private class Empty extends Node {
@Override
public void write(String text) {
if (!isEmpty) {
throw new JsonException("Only allowed to write one value to a json stream");
}
super.write(text);
}
}
private class JsonCollection extends Node {
}
private class JsonObject extends Node {
private boolean isNameNext = true;
public void name(String name) {
if (!isNameNext) {
throw new JsonException("Unexpected attempt to set name of json object: " + name);
}
isNameNext = false;
super.write(asString(name));
appender.accept(": ");
}
@Override
public void write(String text) {
if (isNameNext) {
throw new JsonException("Unexpected attempt to write value before name: " + text);
}
isNameNext = true;
appender.accept(text);
}
}
@FunctionalInterface
private interface SafeBiConsumer {
void consume(T t, U u);
}
}