/*
* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.net.http;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.net.URI;
import java.net.URLPermission;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.time.Duration;
import java.util.Iterator;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.concurrent.Flow;
import java.util.function.Supplier;
import java.net.http.HttpResponse.BodyHandler;
import jdk.internal.net.http.HttpRequestBuilderImpl;
import jdk.internal.net.http.RequestPublishers;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* An HTTP request.
*
* <p> An {@code HttpRequest} instance is built through a {@code HttpRequest}
* {@linkplain HttpRequest.Builder builder}. An {@code HttpRequest} builder
* is obtained from one of the {@link HttpRequest#newBuilder(URI) newBuilder}
* methods. A request's {@linkplain URI}, headers, and body can be set. Request
* bodies are provided through a {@link BodyPublisher} object supplied to the
* {@link Builder#DELETE(BodyPublisher) DELETE},
* {@link Builder#POST(BodyPublisher) POST} or
* {@link Builder#PUT(BodyPublisher) PUT} methods.
* Once all required parameters have been set in the builder, {@link
* Builder#build() build} will return the {@code HttpRequest}. Builders can be
* copied and modified many times in order to build multiple related requests
* that differ in some parameters.
*
* <p> <b>Example HTTP interactions:</b>
* <pre>{@code // GET
* HttpResponse<String> response = client.send(
* HttpRequest.newBuilder(new URI("http://www.foo.com/"))
* .headers("Foo", "foovalue", "Bar", "barvalue")
* .GET()
* .build(),
* BodyHandler.asString()
* );
* int statusCode = response.statusCode();
* String body = response.body();
*
* // POST
* HttpResponse<Path> response = client.send(
* HttpRequest.newBuilder(new URI("http://www.foo.com/"))
* .headers("Foo", "foovalue", "Bar", "barvalue")
* .POST(BodyPublisher.fromString("Hello world"))
* .build(),
* BodyHandler.asFile(Paths.get("/path"))
* );
* int statusCode = response.statusCode();
* Path body = response.body(); // should be "/path" }</pre>
*
* <p> The request is sent and the response obtained by invoking one of the
* following methods in {@link HttpClient}.
* <ul><li>{@link HttpClient#send(HttpRequest, BodyHandler)} blocks
* until the entire request has been sent and the response has been received.</li>
* <li>{@link HttpClient#sendAsync(HttpRequest, BodyHandler)} sends the
* request and receives the response asynchronously. Returns immediately with a
* {@linkplain CompletableFuture CompletableFuture}<{@linkplain HttpResponse}>.</li>
* </ul>
*
* <p> Once a {@link HttpResponse} is received, the headers, response code,
* and body (typically) are available. Whether the response body bytes has been
* read or not depends on the type {@code <T>} of the response body. See below.
*
* <p> <b>Request bodies</b>
*
* <p> Request bodies can be sent using one of the convenience request publisher
* implementations, provided in {@link BodyPublisher}. Alternatively, a custom
* Publisher implementation can be used.
* <ul>
* <li>{@link BodyPublisher#fromByteArray(byte[]) fromByteArray(byte[])} from byte array</li>
* <li>{@link BodyPublisher#fromByteArrays(Iterable) fromByteArrays(Iterable)}
* from an Iterable of byte arrays</li>
* <li>{@link BodyPublisher#fromFile(java.nio.file.Path) fromFile(Path)} from the file located
* at the given Path</li>
* <li>{@link BodyPublisher#fromString(java.lang.String) fromString(String)} from a String </li>
* <li>{@link BodyPublisher#fromInputStream(Supplier) fromInputStream}({@link Supplier}<
* {@link InputStream}>) from an InputStream obtained from a Supplier</li>
* <li>{@link BodyPublisher#noBody() noBody()} no request body is sent</li>
* </ul>
*
* <p> <b>Response bodies</b>
*
* <p> Responses bodies are handled at two levels. When sending the request,
* a response {@linkplain BodyHandler body handler} is specified. This is a
* function that will be called with the response status code and headers, once
* they are received. This function must to return a {@link
* HttpResponse.BodySubscriber}{@code <T>} which is used to read the response
* body bytes, converting them into an instance of {@code T}. After this occurs,
* the response becomes available in a {@link HttpResponse}, and the {@link
* HttpResponse#body()} can be invoked to obtain the actual body. Some
* implementations and examples of usage of both {@link
* HttpResponse.BodySubscriber} and {@link HttpResponse.BodyHandler} are
* provided in {@link HttpResponse}:
*
* <p> <b>Some of the pre-defined body handlers</b><br>
* <ul>
* <li>{@link BodyHandler#asByteArray() BodyHandler.asByteArray()}
* stores the body in a byte array</li>
* <li>{@link BodyHandler#asString() BodyHandler.asString()}
* stores the body as a String </li>
* <li>{@link BodyHandler#asFile(java.nio.file.Path)
* BodyHandler.asFile(Path)} stores the body in a named file</li>
* <li>{@link BodyHandler#replace(Object) BodyHandler.replace(Objectt)}
* discards the response body and returns the given replacement value instead.</li>
* </ul>
*
* <p> <b>Blocking/asynchronous behavior and thread usage</b>
*
* <p> There are two styles of request sending: <i>synchronous</i> and
* <i>asynchronous</i>. {@link HttpClient#send(HttpRequest, HttpResponse.BodyHandler) }
* blocks the calling thread until the request has been sent and the response received.
*
* <p> {@link HttpClient#sendAsync(HttpRequest, HttpResponse.BodyHandler)} is
* asynchronous and returns immediately with a {@link CompletableFuture}<{@link
* HttpResponse}> and when this object completes (possibly in a different
* thread) the response has been received.
*
* <p> Instances of {@code CompletableFuture} can be combined in different ways
* to declare the dependencies among several asynchronous tasks, while allowing
* for the maximum level of parallelism to be utilized.
*
* <p> <a id="securitychecks"></a><b>Security checks</b></a>
*
* <p> If a security manager is present then security checks are performed by
* the HTTP Client's sending methods. An appropriate {@link URLPermission} is
* required to access the destination server, and proxy server if one has
* been configured. The {@code URLPermission} form used to access proxies uses a
* method parameter of {@code "CONNECT"} (for all kinds of proxying) and a URL
* string of the form {@code "socket://host:port"} where host and port specify
* the proxy's address.
*
* <p> In this implementation, if an explicit {@linkplain
* HttpClient.Builder#executor(Executor) executor} has not been set for an
* {@code HttpClient}, and a security manager has been installed, then the
* default executor will execute asynchronous and dependent tasks in a context
* that is granted no permissions. Custom {@linkplain HttpRequest.BodyPublisher
* request body publishers}, {@linkplain HttpResponse.BodyHandler response body
* handlers}, {@linkplain HttpResponse.BodySubscriber response body subscribers},
* and {@linkplain WebSocket.Listener WebSocket Listeners}, if executing
* operations that require privileges, should do so within an appropriate
* {@linkplain AccessController#doPrivileged(PrivilegedAction) privileged context}.
*
* <p> <b>Examples</b>
* <pre>{@code HttpClient client = HttpClient.newHttpClient();
*
* HttpRequest request = HttpRequest
* .newBuilder(URI.create("http://www.foo.com/"))
* .POST(BodyPublisher.fromString("Hello world"))
* .build();
*
* HttpResponse<Path> response =
* client.send(request, BodyHandler.asFile(Paths.get("/path")));
*
* Path body = response.body(); }</pre>
*
* <p><b>Asynchronous Example</b>
*
* <p> The above example will work asynchronously, if {@link HttpClient#sendAsync
* (HttpRequest, HttpResponse.BodyHandler) sendAsync} is used instead of
* {@link HttpClient#send(HttpRequest,HttpResponse.BodyHandler) send}
* in which case the returned object is a {@link CompletableFuture}{@code <HttpResponse>}
* instead of {@link HttpResponse}. The following example shows how multiple requests
* can be sent asynchronously. It also shows how dependent asynchronous operations
* (receiving response, and receiving response body) can be chained easily using
* one of the many methods in {@code CompletableFuture}.
* <pre>{@code // fetch a list of target URIs asynchronously and store them in Files.
*
* List<URI> targets = ...
*
* List<CompletableFuture<File>> futures = targets
* .stream()
* .map(target -> client
* .sendAsync(
* HttpRequest.newBuilder(target)
* .GET()
* .build(),
* BodyHandler.asFile(Paths.get("base", target.getPath())))
* .thenApply(response -> response.body())
* .thenApply(path -> path.toFile()))
* .collect(Collectors.toList());
*
* // all async operations waited for here
*
* CompletableFuture.allOf(futures.toArray(new CompletableFuture<?>[0]))
* .join();
*
* // all elements of futures have completed and can be examined.
* // Use File.exists() to check whether file was successfully downloaded }</pre>
*
* @since 11
*/
public abstract class HttpRequest {
/**
* Creates an HttpRequest.
*/
protected HttpRequest() {}
/**
* A builder of {@linkplain HttpRequest HTTP Requests}.
*
* <p> Instances of {@code HttpRequest.Builder} are created by calling {@link
* HttpRequest#newBuilder(URI)} or {@link HttpRequest#newBuilder()}.
*
* <p> Each of the setter methods in this class modifies the state of the
* builder and returns <i>this</i> (ie. the same instance). The methods are
* not synchronized and should not be called from multiple threads without
* external synchronization.
*
* <p> Note, that not all request headers may be set by user code. Some are
* restricted for security reasons and others such as the headers relating
* to authentication, redirection and cookie management are managed by
* specific APIs rather than through directly user set headers.
*
* <p> The {@linkplain #build() build} method returns a new {@code
* HttpRequest} each time it is invoked.
*
* @since 11
*/
public abstract static class Builder {
/**
* Creates a Builder.
*/
protected Builder() {}
/**
* Sets this {@code HttpRequest}'s request {@code URI}.
*
* @param uri the request URI
* @return this request builder
* @throws IllegalArgumentException if the {@code URI} scheme is not
* supported
*/
public abstract Builder uri(URI uri);
/**
* Requests the server to acknowledge the request before sending the
* body. This is disabled by default. If enabled, the server is
* requested to send an error response or a {@code 100 Continue}
* response before the client sends the request body. This means the
* request publisher for the request will not be invoked until this
* interim response is received.
*
* @param enable {@code true} if Expect continue to be sent
* @return this request builder
*/
public abstract Builder expectContinue(boolean enable);
/**
* Sets the preferred {@link HttpClient.Version} for this request.
*
* <p> The corresponding {@link HttpResponse} should be checked for the
* version that was actually used. If the version is not set in a
* request, then the version requested will be that of the sending
* {@link HttpClient}.
*
* @param version the HTTP protocol version requested
* @return this request builder
*/
public abstract Builder version(HttpClient.Version version);
/**
* Adds the given name value pair to the set of headers for this request.
* The given value is added to the list of values for that name.
*
* @implNote An implementation may choose to restrict some header names
* or values, as the HTTP Client may determine their value itself.
* For example, "Content-Length", which will be determined by
* the request Publisher. In such a case, an implementation of
* {@code HttpRequest.Builder} may choose to throw an
* {@code IllegalArgumentException} if such a header is passed
* to the builder.
*
* @param name the header name
* @param value the header value
* @return this request builder
* @throws IllegalArgumentException if the header name or value is not
* valid, see <a href="https://tools.ietf.org/html/rfc7230#section-3.2">
* RFC 7230 section-3.2</a>, or the header name or value is restricted
* by the implementation.
*/
public abstract Builder header(String name, String value);
/**
* Adds the given name value pairs to the set of headers for this
* request. The supplied {@code String} instances must alternate as
* header names and header values.
* To add several values to the same name then the same name must
* be supplied with each new value.
*
* @param headers the list of name value pairs
* @return this request builder
* @throws IllegalArgumentException if there are an odd number of
* parameters, or if a header name or value is not valid, see
* <a href="https://tools.ietf.org/html/rfc7230#section-3.2">
* RFC 7230 section-3.2</a>, or a header name or value is
* {@linkplain #header(String, String) restricted} by the
* implementation.
*/
public abstract Builder headers(String... headers);
/**
* Sets a timeout for this request. If the response is not received
* within the specified timeout then a {@link HttpTimeoutException} is
* thrown from {@link HttpClient#send(java.net.http.HttpRequest,
* java.net.http.HttpResponse.BodyHandler) HttpClient::send} or
* {@link HttpClient#sendAsync(java.net.http.HttpRequest,
* java.net.http.HttpResponse.BodyHandler) HttpClient::sendAsync}
* completes exceptionally with a {@code HttpTimeoutException}. The effect
* of not setting a timeout is the same as setting an infinite Duration, ie.
* block forever.
*
* @param duration the timeout duration
* @return this request builder
* @throws IllegalArgumentException if the duration is non-positive
*/
public abstract Builder timeout(Duration duration);
/**
* Sets the given name value pair to the set of headers for this
* request. This overwrites any previously set values for name.
*
* @param name the header name
* @param value the header value
* @return this request builder
* @throws IllegalArgumentException if the header name or value is not valid,
* see <a href="https://tools.ietf.org/html/rfc7230#section-3.2">
* RFC 7230 section-3.2</a>, or the header name or value is
* {@linkplain #header(String, String) restricted} by the
* implementation.
*/
public abstract Builder setHeader(String name, String value);
/**
* Sets the request method of this builder to GET.
* This is the default.
*
* @return a {@code HttpRequest}
*/
public abstract Builder GET();
/**
* Sets the request method of this builder to POST and sets its
* request body publisher to the given value.
*
* @param bodyPublisher the body publisher
*
* @return a {@code HttpRequest}
*/
public abstract Builder POST(BodyPublisher bodyPublisher);
/**
* Sets the request method of this builder to PUT and sets its
* request body publisher to the given value.
*
* @param bodyPublisher the body publisher
*
* @return a {@code HttpRequest}
*/
public abstract Builder PUT(BodyPublisher bodyPublisher);
/**
* Sets the request method of this builder to DELETE and sets its
* request body publisher to the given value.
*
* @param bodyPublisher the body publisher
*
* @return a {@code HttpRequest}
*/
public abstract Builder DELETE(BodyPublisher bodyPublisher);
/**
* Sets the request method and request body of this builder to the
* given values.
*
* @apiNote The {@linkplain BodyPublisher#noBody() noBody} request
* body publisher can be used where no request body is required or
* appropriate. Whether a method is restricted, or not, is
* implementation specific. For example, some implementations may choose
* to restrict the {@code CONNECT} method.
*
* @param method the method to use
* @param bodyPublisher the body publisher
* @return a {@code HttpRequest}
* @throws IllegalArgumentException if the method is restricted
*/
public abstract Builder method(String method, BodyPublisher bodyPublisher);
/**
* Builds and returns a {@link HttpRequest}.
*
* @return the request
* @throws IllegalStateException if a URI has not been set
*/
public abstract HttpRequest build();
/**
* Returns an exact duplicate copy of this {@code Builder} based on
* current state. The new builder can then be modified independently of
* this builder.
*
* @return an exact copy of this Builder
*/
public abstract Builder copy();
}
/**
* Creates a {@code HttpRequest} builder.
*
* @param uri the request URI
* @return a new request builder
* @throws IllegalArgumentException if the URI scheme is not supported.
*/
public static HttpRequest.Builder newBuilder(URI uri) {
return new HttpRequestBuilderImpl(uri);
}
/**
* Creates a {@code HttpRequest} builder.
*
* @return a new request builder
*/
public static HttpRequest.Builder newBuilder() {
return new HttpRequestBuilderImpl();
}
/**
* Returns an {@code Optional} containing the {@link BodyPublisher} set on
* this request. If no {@code BodyPublisher} was set in the requests's
* builder, then the {@code Optional} is empty.
*
* @return an {@code Optional} containing this request's {@code BodyPublisher}
*/
public abstract Optional<BodyPublisher> bodyPublisher();
/**
* Returns the request method for this request. If not set explicitly,
* the default method for any request is "GET".
*
* @return this request's method
*/
public abstract String method();
/**
* Returns an {@code Optional} containing this request's timeout duration.
* If the timeout duration was not set in the request's builder, then the
* {@code Optional} is empty.
*
* @return an {@code Optional} containing this request's timeout duration
*/
public abstract Optional<Duration> timeout();
/**
* Returns this request's {@link HttpRequest.Builder#expectContinue(boolean)
* expect continue } setting.
*
* @return this request's expect continue setting
*/
public abstract boolean expectContinue();
/**
* Returns this request's request {@code URI}.
*
* @return this request's URI
*/
public abstract URI uri();
/**
* Returns an {@code Optional} containing the HTTP protocol version that
* will be requested for this {@code HttpRequest}. If the version was not
* set in the request's builder, then the {@code Optional} is empty.
* In that case, the version requested will be that of the sending
* {@link HttpClient}. The corresponding {@link HttpResponse} should be
* queried to determine the version that was actually used.
*
* @return HTTP protocol version
*/
public abstract Optional<HttpClient.Version> version();
/**
* The (user-accessible) request headers that this request was (or will be)
* sent with.
*
* @return this request's HttpHeaders
*/
public abstract HttpHeaders headers();
/**
* Tests this HTTP request instance for equality with the given object.
*
* <p> If the given object is not an {@code HttpRequest} then this
* method returns {@code false}. Two HTTP requests are equal if their URI,
* method, and headers fields are all equal.
*
* <p> This method satisfies the general contract of the {@link
* Object#equals(Object) Object.equals} method.
*
* @param obj the object to which this object is to be compared
* @return {@code true} if, and only if, the given object is an {@code
* HttpRequest} that is equal to this HTTP request
*/
@Override
public final boolean equals(Object obj) {
if (! (obj instanceof HttpRequest))
return false;
HttpRequest that = (HttpRequest)obj;
if (!that.method().equals(this.method()))
return false;
if (!that.uri().equals(this.uri()))
return false;
if (!that.headers().equals(this.headers()))
return false;
return true;
}
/**
* Computes a hash code for this HTTP request instance.
*
* <p> The hash code is based upon the HTTP request's URI, method, and
* header components, and satisfies the general contract of the
* {@link Object#hashCode Object.hashCode} method.
*
* @return the hash-code value for this HTTP request
*/
public final int hashCode() {
return method().hashCode()
+ uri().hashCode()
+ headers().hashCode();
}
/**
* A Publisher which converts high level Java objects into flows of
* byte buffers suitable for sending as request bodies.
*
* <p> The {@code BodyPublisher} class implements {@link Flow.Publisher
* Flow.Publisher<ByteBuffer>} which means that a {@code BodyPublisher}
* acts as a publisher of {@linkplain ByteBuffer byte buffers}.
*
* <p> The HTTP client implementation subscribes to the publisher in order
* to receive the flow of outgoing data buffers. The normal semantics of
* {@link Flow.Subscriber} and {@link Flow.Publisher} are implemented by the
* library and are expected from publisher implementations. Each outgoing
* request results in one {@code Subscriber} subscribing to the {@code
* BodyPublisher} in order to provide the sequence of byte buffers
* containing the request body.
* Instances of {@code ByteBuffer} published by the publisher must be
* allocated by the publisher, and must not be accessed after being handed
* over to the library.
* These subscriptions complete normally when the request is fully sent,
* and can be canceled or terminated early through error. If a request
* needs to be resent for any reason, then a new subscription is created
* which is expected to generate the same data as before.
*
* <p> A publisher that reports a {@linkplain #contentLength() content
* length} of {@code 0} may not be subscribed to by the HTTP client
* implementation, as it has effectively no data to publish.
*/
public interface BodyPublisher extends Flow.Publisher<ByteBuffer> {
/**
* Returns a request body publisher whose body is retrieved from the
* given {@code Flow.Publisher}. The returned request body publisher
* has an unknown content length.
*
* @apiNote This method can be used as an adapter between {@code
* BodyPublisher} and {@code Flow.Publisher}, where the amount of
* request body that the publisher will publish is unknown.
*
* @param publisher the publisher responsible for publishing the body
* @return a BodyPublisher
*/
static BodyPublisher fromPublisher(Flow.Publisher<? extends ByteBuffer> publisher) {
return new RequestPublishers.PublisherAdapter(publisher, -1L);
}
/**
* Returns a request body publisher whose body is retrieved from the
* given {@code Flow.Publisher}. The returned request body publisher
* has the given content length.
*
* <p> The given {@code contentLength} is a positive number, that
* represents the exact amount of bytes the {@code publisher} must
* publish.
*
* @apiNote This method can be used as an adapter between {@code
* BodyPublisher} and {@code Flow.Publisher}, where the amount of
* request body that the publisher will publish is known.
*
* @param publisher the publisher responsible for publishing the body
* @param contentLength a positive number representing the exact
* amount of bytes the publisher will publish
* @throws IllegalArgumentException if the content length is
* non-positive
* @return a BodyPublisher
*/
static BodyPublisher fromPublisher(Flow.Publisher<? extends ByteBuffer> publisher,
long contentLength) {
if (contentLength < 1)
throw new IllegalArgumentException("non-positive contentLength: " + contentLength);
return new RequestPublishers.PublisherAdapter(publisher, contentLength);
}
/**
* Returns a request body publisher whose body is the given {@code
* String}, converted using the {@link StandardCharsets#UTF_8 UTF_8}
* character set.
*
* @param body the String containing the body
* @return a BodyPublisher
*/
static BodyPublisher fromString(String body) {
return fromString(body, UTF_8);
}
/**
* Returns a request body publisher whose body is the given {@code
* String}, converted using the given character set.
*
* @param s the String containing the body
* @param charset the character set to convert the string to bytes
* @return a BodyPublisher
*/
static BodyPublisher fromString(String s, Charset charset) {
return new RequestPublishers.StringPublisher(s, charset);
}
/**
* A request body publisher that reads its data from an {@link
* InputStream}. A {@link Supplier} of {@code InputStream} is used in
* case the request needs to be repeated, as the content is not buffered.
* The {@code Supplier} may return {@code null} on subsequent attempts,
* in which case the request fails.
*
* @param streamSupplier a Supplier of open InputStreams
* @return a BodyPublisher
*/
// TODO (spec): specify that the stream will be closed
static BodyPublisher fromInputStream(Supplier<? extends InputStream> streamSupplier) {
return new RequestPublishers.InputStreamPublisher(streamSupplier);
}
/**
* Returns a request body publisher whose body is the given byte array.
*
* @param buf the byte array containing the body
* @return a BodyPublisher
*/
static BodyPublisher fromByteArray(byte[] buf) {
return new RequestPublishers.ByteArrayPublisher(buf);
}
/**
* Returns a request body publisher whose body is the content of the
* given byte array of {@code length} bytes starting from the specified
* {@code offset}.
*
* @param buf the byte array containing the body
* @param offset the offset of the first byte
* @param length the number of bytes to use
* @return a BodyPublisher
* @throws IndexOutOfBoundsException if the sub-range is defined to be
* out-of-bounds
*/
static BodyPublisher fromByteArray(byte[] buf, int offset, int length) {
Objects.checkFromIndexSize(offset, length, buf.length);
return new RequestPublishers.ByteArrayPublisher(buf, offset, length);
}
private static String pathForSecurityCheck(Path path) {
return path.toFile().getPath();
}
/**
* A request body publisher that takes data from the contents of a File.
*
* @param path the path to the file containing the body
* @return a BodyPublisher
* @throws java.io.FileNotFoundException if the path is not found
* @throws SecurityException if a security manager has been installed
* and it denies {@link SecurityManager#checkRead(String)
* read access} to the given file
*/
static BodyPublisher fromFile(Path path) throws FileNotFoundException {
Objects.requireNonNull(path);
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkRead(pathForSecurityCheck(path));
if (Files.notExists(path))
throw new FileNotFoundException(path + " not found");
return new RequestPublishers.FilePublisher(path);
}
/**
* A request body publisher that takes data from an {@code Iterable}
* of byte arrays. An {@link Iterable} is provided which supplies
* {@link Iterator} instances. Each attempt to send the request results
* in one invocation of the {@code Iterable}.
*
* @param iter an Iterable of byte arrays
* @return a BodyPublisher
*/
static BodyPublisher fromByteArrays(Iterable<byte[]> iter) {
return new RequestPublishers.IterablePublisher(iter);
}
/**
* A request body publisher which sends no request body.
*
* @return a BodyPublisher which completes immediately and sends
* no request body.
*/
static BodyPublisher noBody() {
return new RequestPublishers.EmptyPublisher();
}
/**
* Returns the content length for this request body. May be zero
* if no request body being sent, greater than zero for a fixed
* length content, or less than zero for an unknown content length.
*
* This method may be invoked before the publisher is subscribed to.
* This method may be invoked more than once by the HTTP client
* implementation, and MUST return the same constant value each time.
*
* @return the content length for this request body, if known
*/
long contentLength();
}
}