org.openqa.selenium.remote.server.NewSessionPayload Maven / Gradle / Ivy
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Selenium automates browsers. That's it! What you do with that power is entirely up to you.
package org.openqa.selenium.remote.server;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.nio.file.StandardOpenOption.CREATE;
import static java.nio.file.StandardOpenOption.TRUNCATE_EXISTING;
import com.google.common.base.Strings;
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.CharStreams;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import org.openqa.selenium.Capabilities;
import org.openqa.selenium.ImmutableCapabilities;
import org.openqa.selenium.io.FileHandler;
import org.openqa.selenium.remote.BeanToJsonConverter;
import org.openqa.selenium.remote.Dialect;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.UncheckedIOException;
import java.io.Writer;
import java.lang.reflect.Type;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.logging.Logger;
import java.util.regex.Pattern;
import java.util.stream.Stream;
public class NewSessionPayload implements Closeable {
private static final Logger LOG = Logger.getLogger(NewSessionPayload.class.getName());
private static final Dialect DEFAULT_DIALECT = Dialect.OSS;
private final static Predicate ACCEPTED_W3C_PATTERNS = Stream.of(
"^[\\w-]+:.*$",
"^acceptInsecureCerts$",
"^browserName$",
"^browserVersion$",
"^platformName$",
"^pageLoadStrategy$",
"^proxy$",
"^setWindowRect$",
"^timeouts$",
"^unhandledPromptBehavior$")
.map(Pattern::compile)
.map(Pattern::asPredicate)
.reduce(identity -> false, Predicate::or);
// Dedicate up to 10% of max ram to holding the payload
private static final long THRESHOLD = Runtime.getRuntime().maxMemory() / 10;
private static final Gson GSON = new GsonBuilder().setLenient().serializeNulls().create();
private static final Type MAP_TYPE = new TypeToken>(){}.getType();
private final Path root;
private final Sources sources;
public static NewSessionPayload create(Capabilities caps) throws IOException {
// 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.
ImmutableMap.Builder builder = ImmutableMap.builder();
// OSS
builder.put("desiredCapabilities", caps.asMap());
// W3C Spec.
// TODO(simons): There's some serious overlap between ProtocolHandshake and this class.
ImmutableMap.Builder w3cCaps = ImmutableMap.builder();
caps.asMap().entrySet().stream()
.filter(e -> ACCEPTED_W3C_PATTERNS.test(e.getKey()))
.filter(e -> e.getValue() != null)
.forEach(e -> w3cCaps.put(e.getKey(), e.getValue()));
builder.put(
"capabilities", ImmutableMap.of(
"firstMatch", ImmutableList.of(w3cCaps.build())));
return new NewSessionPayload(builder.build());
}
public NewSessionPayload(Map source) throws IOException {
Objects.requireNonNull(source, "Payload must be set");
String json = new BeanToJsonConverter().convert(source);
Sources sources;
long size = json.length() * 2; // Each character takes two bytes
if (size > THRESHOLD || Runtime.getRuntime().freeMemory() < size) {
this.root = Files.createTempDirectory("new-session");
sources = diskBackedSource(new StringReader(json));
} else {
this.root = null;
sources = memoryBackedSource(source);
}
validate(sources);
this.sources = rewrite(sources);
}
public NewSessionPayload(long size, Reader source) throws IOException {
Sources sources;
if (size > THRESHOLD || Runtime.getRuntime().freeMemory() < size) {
this.root = Files.createTempDirectory("new-session");
sources = diskBackedSource(source);
} else {
this.root = null;
sources = memoryBackedSource(GSON.fromJson(source, MAP_TYPE));
}
validate(sources);
this.sources = rewrite(sources);
}
private void validate(Sources sources) {
if (!sources.getDialects().contains(Dialect.W3C)) {
return; // Nothing to do
}
// Ensure that the W3C payload looks okay
Map alwaysMatch = sources.getAlwaysMatch().get();
validateSpecCompliance(alwaysMatch);
Set duplicateKeys = sources.getFirstMatch().stream()
.map(Supplier::get)
.peek(this::validateSpecCompliance)
.map(fragment -> Sets.intersection(alwaysMatch.keySet(), fragment.keySet()))
.flatMap(Collection::stream)
.collect(ImmutableSortedSet.toImmutableSortedSet(Ordering.natural()));
if (!duplicateKeys.isEmpty()) {
throw new IllegalArgumentException(
"W3C payload contained keys duplicated between the firstMatch and alwaysMatch items: " +
duplicateKeys);
}
}
private void validateSpecCompliance(Map fragment) {
ImmutableList badKeys = fragment.keySet().stream()
.filter(ACCEPTED_W3C_PATTERNS.negate())
.collect(ImmutableList.toImmutableList());
if (!badKeys.isEmpty()) {
throw new IllegalArgumentException(
"W3C payload contained keys that do not comply with the spec: " + badKeys);
}
}
/**
* If the local end sent a request with a JSON Wire Protocol payload that does not have a matching
* W3C payload, then we need to synthesize one that matches.
*/
private Sources rewrite(Sources sources) {
if (!sources.getDialects().contains(Dialect.OSS)) {
// Yay! Nothing to do!
return sources;
}
if (!sources.getDialects().contains(Dialect.W3C)) {
// Yay! Also nothing to do. I mean, we have an empty payload, but that's cool.
return sources;
}
Map ossPayload = sources.getOss().get().entrySet().stream()
.filter(e -> !("platform".equals(e.getKey()) && "ANY".equals(e.getValue())))
.filter(e -> !("version".equals(e.getKey()) && "".equals(e.getValue())))
.collect(ImmutableMap.toImmutableMap(Map.Entry::getKey, Map.Entry::getValue));
Map always = sources.getAlwaysMatch().get();
Optional> w3cMatch = sources.getFirstMatch().stream()
.map(Supplier::get)
.map(m -> ImmutableMap.builder().putAll(always).putAll(m).build())
.filter(m -> m.equals(ossPayload))
.findAny();
if (w3cMatch.isPresent()) {
// There's a w3c capability that matches the oss one. Nothing to do.
LOG.fine("Found a w3c capability that matches the oss one.");
return sources;
}
LOG.info( "Mismatched capabilities. Creating a synthetic w3c capability.");
ImmutableList.Builder>> newFirstMatches = ImmutableList.builder();
newFirstMatches.add(sources.getOss());
sources.getFirstMatch()
.forEach(m -> newFirstMatches.add(() -> {
ImmutableMap.Builder builder = ImmutableMap.builder();
builder.putAll(sources.getAlwaysMatch().get());
builder.putAll(m.get());
return builder.build();
}));
return new Sources(
sources.getOriginalPayload(),
sources.getPayloadSize(),
sources.getOss(),
ImmutableMap::of,
newFirstMatches.build(),
sources.getDialects());
}
private Sources memoryBackedSource(Map source) {
LOG.fine("Memory-based payload for: " + source);
Set dialects = new TreeSet<>();
Map oss = toMap(source.get("desiredCapabilities"));
if (oss != null) {
dialects.add(Dialect.OSS);
}
Map alwaysMatch = new TreeMap<>();
List>> firstMatches = new LinkedList<>();
Map caps = toMap(source.get("capabilities"));
if (caps != null) {
Map always = toMap(caps.get("alwaysMatch"));
if (always != null) {
alwaysMatch.putAll(always);
dialects.add(Dialect.W3C);
}
Object raw = caps.get("firstMatch");
if (raw instanceof Collection) {
((Collection) raw).stream()
.map(NewSessionPayload::toMap)
.filter(Objects::nonNull)
.forEach(m -> firstMatches.add(() -> m));
dialects.add(Dialect.W3C);
}
if (firstMatches.isEmpty()) {
firstMatches.add(ImmutableMap::of);
}
}
byte[] json = new BeanToJsonConverter().convert(source).getBytes(UTF_8);
return new Sources(
() -> new ByteArrayInputStream(json),
json.length,
() -> oss,
() -> alwaysMatch,
firstMatches,
dialects);
}
private Sources diskBackedSource(Reader source) throws IOException {
LOG.fine("Disk-based payload for " + source);
// Copy the original payload to disk
Path payload = root.resolve("original-payload.json");
try (Writer out = Files.newBufferedWriter(payload, UTF_8)) {
CharStreams.copy(source, out);
}
try (
Reader in = Files.newBufferedReader(payload);
JsonReader json = GSON.newJsonReader(in)) {
Set dialects = new TreeSet<>();
Supplier> oss = null;
Supplier> always = ImmutableMap::of;
List>> first = new LinkedList<>();
json.beginObject();
while (json.hasNext()) {
switch (json.nextName()) {
case "capabilities":
json.beginObject();
while (json.hasNext()) {
switch (json.nextName()) {
case "alwaysMatch":
Path a = write("always-match.json", json);
always = () -> read(a);
dialects.add(Dialect.W3C);
break;
case "firstMatch":
json.beginArray();
int i = 0;
while (json.hasNext()) {
Path f = write("first-match-" + i + ".json", json);
first.add(() -> read(f));
i++;
}
json.endArray();
dialects.add(Dialect.W3C);
break;
default:
json.skipValue();
}
}
json.endObject();
break;
case "desiredCapabilities":
Path ossCaps = write("oss.json", json);
oss = () -> read(ossCaps);
dialects.add(Dialect.OSS);
break;
default:
json.skipValue();
}
}
json.endObject();
if (first.isEmpty()) {
first.add(ImmutableMap::of);
}
return new Sources(
() -> {
try {
return Files.newInputStream(payload);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
},
Files.size(payload),
oss,
always,
first,
dialects);
} finally {
source.close();
}
}
private Path write(String fileName, JsonReader json) throws IOException {
Path out = root.resolve(fileName);
Map value = GSON.fromJson(json, MAP_TYPE);
try (Writer writer = Files.newBufferedWriter(out, UTF_8, TRUNCATE_EXISTING, CREATE)) {
GSON.toJson(value, writer);
}
return out;
}
private Map read(Path path) {
try (Reader reader = Files.newBufferedReader(path, UTF_8)) {
return GSON.fromJson(reader, MAP_TYPE);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private static Map toMap(Object obj) {
if (!(obj instanceof Map)) {
return null;
}
return ((Map) obj).entrySet()
.stream()
.filter(e -> e.getKey() != null)
.filter(e -> e.getValue() != null)
.collect(ImmutableMap.toImmutableMap(e -> String.valueOf(e.getKey()), Map.Entry::getValue));
}
public Stream stream() throws IOException {
Stream> mapStream;
if (getDownstreamDialects().contains(Dialect.W3C)) {
Map always = sources.getAlwaysMatch().get();
mapStream = sources.getFirstMatch().stream()
.map(Supplier::get)
.map(m -> ImmutableMap.builder().putAll(always).putAll(m).build());
} else if (getDownstreamDialects().contains(Dialect.OSS)) {
mapStream = Stream.of(sources.getOss().get());
} else {
mapStream = Stream.of(ImmutableMap.of());
}
return mapStream.map(ImmutableCapabilities::new);
}
public ImmutableSet getDownstreamDialects() {
return sources.getDialects().isEmpty() ?
ImmutableSet.of(DEFAULT_DIALECT) :
sources .getDialects();
}
public Supplier getPayload() {
return sources.getOriginalPayload();
}
public long getPayloadSize() {
return sources.getPayloadSize();
}
@Override
public void close() {
if (root != null) {
FileHandler.delete(root.toAbsolutePath().toFile());
}
}
private static class Sources {
private final Supplier originalPayload;
private final long payloadSizeInBytes;
private final Supplier> oss;
private final Supplier> alwaysMatch;
private final List>> firstMatch;
private final ImmutableSet dialects;
Sources(
Supplier originalPayload,
long payloadSizeInBytes,
Supplier> oss,
Supplier> alwaysMatch,
List>> firstMatch,
Set dialects) {
this.originalPayload = originalPayload;
this.payloadSizeInBytes = payloadSizeInBytes;
this.oss = oss;
this.alwaysMatch = alwaysMatch;
this.firstMatch = firstMatch;
this.dialects = ImmutableSet.copyOf(dialects);
}
Supplier getOriginalPayload() {
return originalPayload;
}
Supplier> getOss() {
return oss;
}
Supplier> getAlwaysMatch() {
return alwaysMatch;
}
List>> getFirstMatch() {
return firstMatch;
}
ImmutableSet getDialects() {
return dialects;
}
public long getPayloadSize() {
return payloadSizeInBytes;
}
}
}