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Selenium automates browsers. That's it! What you do with that power is entirely up to you.
// 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.remote;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.openqa.selenium.json.Json.LIST_OF_MAPS_TYPE;
import static org.openqa.selenium.json.Json.MAP_TYPE;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Ordering;
import com.google.common.collect.Sets;
import com.google.common.io.CharSource;
import com.google.common.io.CharStreams;
import com.google.common.io.FileBackedOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.UncheckedIOException;
import java.io.Writer;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.openqa.selenium.AcceptedW3CCapabilityKeys;
import org.openqa.selenium.Capabilities;
import org.openqa.selenium.ImmutableCapabilities;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.json.Json;
import org.openqa.selenium.json.JsonInput;
import org.openqa.selenium.json.JsonOutput;
public class NewSessionPayload implements Closeable {
private static final Dialect DEFAULT_DIALECT = Dialect.W3C;
private static final Predicate ACCEPTED_W3C_PATTERNS = new AcceptedW3CCapabilityKeys();
private final Json json = new Json();
private final FileBackedOutputStream backingStore;
private final ImmutableSet dialects;
private NewSessionPayload(Reader source) {
// Dedicate up to 10% of all RAM or 20% of available RAM (whichever is smaller) to storing this
// payload.
int threshold =
(int)
Math.min(
Integer.MAX_VALUE,
Math.min(
Runtime.getRuntime().freeMemory() / 5, Runtime.getRuntime().maxMemory() / 10));
backingStore = new FileBackedOutputStream(threshold);
try (Writer writer = new OutputStreamWriter(backingStore, UTF_8)) {
CharStreams.copy(source, writer);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
ImmutableSet.Builder dialects = ImmutableSet.builder();
try {
if (isW3C()) {
dialects.add(Dialect.W3C);
}
this.dialects = dialects.build();
validate();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
try {
source.close();
} catch (IOException e) {
// Ignore
}
}
public static NewSessionPayload create(Capabilities caps) {
Require.nonNull("Capabilities", caps);
return create(Collections.singleton(caps));
}
public static NewSessionPayload create(Collection caps) {
// We need to convert the capabilities into a new session payload. At this point we're dealing
// with references, so I'm Just Sure This Will Be Fine.
return create(
ImmutableMap.of(
"capabilities",
ImmutableMap.of(
"firstMatch",
caps.stream().map(Capabilities::asMap).collect(Collectors.toList()))));
}
public static NewSessionPayload create(Map source) {
// It is expected that the input to this method contains a properly formed
// "new session" request, and not just a random blob of data. Make sure
// this precondition is met before continuing.
Require.precondition(
source.containsKey("capabilities"), "New session payload must contain capabilities");
String json = new Json().toJson(Require.nonNull("Payload", source), 100);
return new NewSessionPayload(new StringReader(json));
}
public static NewSessionPayload create(Reader source) {
return new NewSessionPayload(source);
}
private void validate() throws IOException {
Map alwaysMatch = getAlwaysMatch();
if (alwaysMatch == null) {
alwaysMatch = ImmutableMap.of();
}
Map always = alwaysMatch;
Collection> firsts = getFirstMatches();
if (firsts == null) {
firsts = ImmutableList.of(ImmutableMap.of());
}
if (firsts.isEmpty()) {
throw new IllegalArgumentException("First match w3c capabilities is zero length");
}
firsts.stream()
.peek(
map -> {
Set overlap = Sets.intersection(always.keySet(), map.keySet());
if (!overlap.isEmpty()) {
throw new IllegalArgumentException(
"Overlapping keys between w3c always and first match capabilities: " + overlap);
}
})
.map(
first -> {
Map toReturn = new HashMap<>();
toReturn.putAll(always);
toReturn.putAll(first);
return toReturn;
})
.peek(
map -> {
ImmutableSortedSet nullKeys =
map.entrySet().stream()
.filter(entry -> entry.getValue() == null)
.map(Map.Entry::getKey)
.collect(ImmutableSortedSet.toImmutableSortedSet(Ordering.natural()));
if (!nullKeys.isEmpty()) {
throw new IllegalArgumentException(
"Null values found in w3c capabilities. Keys are: " + nullKeys);
}
})
.peek(
map -> {
ImmutableSortedSet illegalKeys =
map.keySet().stream()
.filter(ACCEPTED_W3C_PATTERNS.negate())
.collect(ImmutableSortedSet.toImmutableSortedSet(Ordering.natural()));
if (!illegalKeys.isEmpty()) {
throw new IllegalArgumentException(
"Illegal key values seen in w3c capabilities: " + illegalKeys);
}
})
.forEach(map -> {});
}
public void writeTo(Appendable appendable) throws IOException {
try (JsonOutput json = new Json().newOutput(appendable)) {
json.beginObject();
// Now for the w3c capabilities
json.name("capabilities");
json.beginObject();
// Then write everything into the w3c payload. Because of the way we do this, it's easiest
// to just populate the "firstMatch" section. The spec says it's fine to omit the
// "alwaysMatch" field, so we do this.
json.name("firstMatch");
json.beginArray();
getW3C().forEach(json::write);
json.endArray();
json.endObject(); // Close "capabilities" object
writeMetaData(json);
json.endObject();
}
}
private void writeMetaData(JsonOutput out) throws IOException {
CharSource charSource = backingStore.asByteSource().asCharSource(UTF_8);
try (Reader reader = charSource.openBufferedStream();
JsonInput input = json.newInput(reader)) {
input.beginObject();
while (input.hasNext()) {
String name = input.nextName();
switch (name) {
case "capabilities":
// These fields were used by the (now defunct) JSON Wire Protocol, but we
// keep them here since we might see them from ancient clients.
case "desiredCapabilities":
case "requiredCapabilities":
input.skipValue();
break;
default:
out.name(name);
out.write(input.read(Object.class));
break;
}
}
}
}
/**
* Stream the {@link Capabilities} encoded in the payload used to create this instance. The {@link
* Stream} will expand each of the "{@code firstMatch}" and "{@code alwaysMatch}" contents as
* defined in the W3C WebDriver spec.
*/
public Stream stream() {
try {
return getW3C().filter(Objects::nonNull).distinct().map(ImmutableCapabilities::new);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
public Set getDownstreamDialects() {
return dialects.isEmpty() ? ImmutableSet.of(DEFAULT_DIALECT) : dialects;
}
public Map getMetadata() {
Set ignoredMetadataKeys =
ImmutableSet.of("capabilities", "desiredCapabilities", "requiredCapabilities");
CharSource charSource = backingStore.asByteSource().asCharSource(UTF_8);
try (Reader reader = charSource.openBufferedStream();
JsonInput input = json.newInput(reader)) {
ImmutableMap.Builder toReturn = ImmutableMap.builder();
input.beginObject();
while (input.hasNext()) {
String name = input.nextName();
if (ignoredMetadataKeys.contains(name)) {
input.skipValue();
continue;
}
Object value = input.read(Object.class);
if (value == null) {
continue;
}
toReturn.put(name, value);
}
input.endObject();
return toReturn.build();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
@Override
public void close() {
try {
backingStore.reset();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private Stream> getW3C() throws IOException {
// For the sake of simplicity, we're going to make the (probably wrong)
// assumption we can hold all of the firstMatch values and alwaysMatch
// value in memory at the same time.
Stream> fromW3c;
Map alwaysMatch = getAlwaysMatch();
Collection> firsts = getFirstMatches();
if (alwaysMatch == null && firsts == null) {
fromW3c = Stream.of(); // No W3C capabilities.
} else {
if (alwaysMatch == null) {
alwaysMatch = ImmutableMap.of();
}
Map always = alwaysMatch; // Keep the compiler happy.
if (firsts == null) {
firsts = ImmutableList.of(ImmutableMap.of());
}
fromW3c =
firsts.stream()
.map(
first ->
ImmutableMap.builder().putAll(always).putAll(first).build());
}
return fromW3c.distinct();
}
private boolean isW3C() throws IOException {
CharSource charSource = backingStore.asByteSource().asCharSource(UTF_8);
try (Reader reader = charSource.openBufferedStream();
JsonInput input = json.newInput(reader)) {
input.beginObject();
while (input.hasNext()) {
String name = input.nextName();
if ("capabilities".equals(name)) {
return true;
} else {
input.skipValue();
}
}
}
return false;
}
private Map getAlwaysMatch() throws IOException {
CharSource charSource = backingStore.asByteSource().asCharSource(UTF_8);
try (Reader reader = charSource.openBufferedStream();
JsonInput input = json.newInput(reader)) {
input.beginObject();
while (input.hasNext()) {
String name = input.nextName();
if ("capabilities".equals(name)) {
input.beginObject();
while (input.hasNext()) {
name = input.nextName();
if ("alwaysMatch".equals(name)) {
return input.read(MAP_TYPE);
} else {
input.skipValue();
}
}
input.endObject();
} else {
input.skipValue();
}
}
}
return ImmutableMap.of();
}
private Collection> getFirstMatches() throws IOException {
CharSource charSource = backingStore.asByteSource().asCharSource(UTF_8);
try (Reader reader = charSource.openBufferedStream();
JsonInput input = json.newInput(reader)) {
input.beginObject();
while (input.hasNext()) {
String name = input.nextName();
if ("capabilities".equals(name)) {
input.beginObject();
while (input.hasNext()) {
name = input.nextName();
if ("firstMatch".equals(name)) {
return input.read(LIST_OF_MAPS_TYPE);
} else {
input.skipValue();
}
}
input.endObject();
} else {
input.skipValue();
}
}
}
return ImmutableList.of(ImmutableMap.of());
}
@Override
public String toString() {
StringBuilder res = new StringBuilder();
try {
writeTo(res);
} catch (IOException ignore) {
}
return res.toString();
}
}
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