serval-dna/java/org/servalproject/servaldna/rhizome/RhizomeCommon.java

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/**
* Copyright (C) 2014 Serval Project Inc.
*
* This file is part of Serval Software (http://www.servalproject.org)
*
* Serval Software is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This source 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this source code; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.servalproject.servaldna.rhizome;
import java.lang.StringBuilder;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import java.util.List;
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import java.io.IOException;
import java.io.PrintStream;
import java.io.InputStream;
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import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import org.servalproject.json.JSONTokeniser;
import org.servalproject.json.JSONInputException;
import org.servalproject.servaldna.BundleId;
import org.servalproject.servaldna.FileHash;
import org.servalproject.servaldna.BundleKey;
import org.servalproject.servaldna.SubscriberId;
import org.servalproject.servaldna.BundleSecret;
import org.servalproject.servaldna.ServalDHttpConnectionFactory;
import org.servalproject.servaldna.ServalDInterfaceException;
import org.servalproject.servaldna.ServalDFailureException;
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public class RhizomeCommon
{
protected static InputStream receiveResponse(HttpURLConnection conn, int expected_response_code) throws IOException, ServalDInterfaceException
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{
int[] expected_response_codes = { expected_response_code };
return receiveResponse(conn, expected_response_codes);
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}
protected static InputStream receiveResponse(HttpURLConnection conn, int[] expected_response_codes) throws IOException, ServalDInterfaceException
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{
for (int code: expected_response_codes) {
if (conn.getResponseCode() == code)
return conn.getInputStream();
}
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if (!conn.getContentType().equals("application/json"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
if (conn.getResponseCode() == HttpURLConnection.HTTP_FORBIDDEN) {
JSONTokeniser json = new JSONTokeniser(new InputStreamReader(conn.getErrorStream(), "US-ASCII"));
Status status = decodeRestfulStatus(json);
throw new ServalDInterfaceException("unexpected Rhizome failure, \"" + status.message + "\"");
}
throw new ServalDInterfaceException("unexpected HTTP response code: " + conn.getResponseCode());
}
protected static JSONTokeniser receiveRestfulResponse(HttpURLConnection conn, int expected_response_code) throws IOException, ServalDInterfaceException
{
int[] expected_response_codes = { expected_response_code };
return receiveRestfulResponse(conn, expected_response_codes);
}
protected static JSONTokeniser receiveRestfulResponse(HttpURLConnection conn, int[] expected_response_codes) throws IOException, ServalDInterfaceException
{
InputStream in = receiveResponse(conn, expected_response_codes);
if (!conn.getContentType().equals("application/json"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
return new JSONTokeniser(new InputStreamReader(in, "US-ASCII"));
}
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private static class Status {
public String message;
}
protected static Status decodeRestfulStatus(JSONTokeniser json) throws IOException, ServalDInterfaceException
{
try {
Status status = new Status();
json.consume(JSONTokeniser.Token.START_OBJECT);
json.consume("http_status_code");
json.consume(JSONTokeniser.Token.COLON);
json.consume(Integer.class);
json.consume(JSONTokeniser.Token.COMMA);
status.message = json.consume("http_status_message");
json.consume(JSONTokeniser.Token.COLON);
String message = json.consume(String.class);
json.consume(JSONTokeniser.Token.END_OBJECT);
json.consume(JSONTokeniser.Token.EOF);
return status;
}
catch (JSONInputException e) {
throw new ServalDInterfaceException("malformed JSON status response", e);
}
}
public static RhizomeManifestBundle rhizomeManifest(ServalDHttpConnectionFactory connector, BundleId bid) throws IOException, ServalDInterfaceException
{
HttpURLConnection conn = connector.newServalDHttpConnection("/restful/rhizome/" + bid.toHex() + ".rhm");
conn.connect();
InputStream in = RhizomeCommon.receiveResponse(conn, HttpURLConnection.HTTP_OK);
if (!conn.getContentType().equals("rhizome-manifest/text"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
RhizomeManifest manifest;
try {
manifest = RhizomeManifest.fromTextFormat(in);
}
catch (RhizomeManifestParseException e) {
throw new ServalDInterfaceException("malformed manifest from daemon", e);
}
finally {
in.close();
}
dumpHeaders(conn, System.err);
long insertTime = headerUnsignedLong(conn, "Serval-Rhizome-Bundle-Inserttime");
SubscriberId author = header(conn, "Serval-Rhizome-Bundle-Author", SubscriberId.class);
BundleSecret secret = header(conn, "Serval-Rhizome-Bundle-Secret", BundleSecret.class);
return new RhizomeManifestBundle(manifest, insertTime, author, secret);
}
public static RhizomePayloadRawBundle rhizomePayloadRaw(ServalDHttpConnectionFactory connector, BundleId bid) throws IOException, ServalDInterfaceException
{
HttpURLConnection conn = connector.newServalDHttpConnection("/restful/rhizome/" + bid.toHex() + "/raw.bin");
conn.connect();
InputStream in = RhizomeCommon.receiveResponse(conn, HttpURLConnection.HTTP_OK);
if (!conn.getContentType().equals("application/octet-stream"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
dumpHeaders(conn, System.err);
RhizomeManifest manifest = manifestFromHeaders(conn);
long insertTime = headerUnsignedLong(conn, "Serval-Rhizome-Bundle-Inserttime");
SubscriberId author = header(conn, "Serval-Rhizome-Bundle-Author", SubscriberId.class);
BundleSecret secret = header(conn, "Serval-Rhizome-Bundle-Secret", BundleSecret.class);
return new RhizomePayloadRawBundle(manifest, in, insertTime, author, secret);
}
private static void dumpHeaders(HttpURLConnection conn, PrintStream out)
{
for (Map.Entry<String,List<String>> e: conn.getHeaderFields().entrySet())
for (String v: e.getValue())
out.println("received header " + e.getKey() + ": " + v);
}
private static RhizomeManifest manifestFromHeaders(HttpURLConnection conn) throws ServalDInterfaceException
{
BundleId id = header(conn, "Serval-Rhizome-Bundle-Id", BundleId.class);
long version = headerUnsignedLong(conn, "Serval-Rhizome-Bundle-Version");
long filesize = headerUnsignedLong(conn, "Serval-Rhizome-Bundle-Filesize");
FileHash filehash = filesize == 0 ? null : header(conn, "Serval-Rhizome-Bundle-Filehash", FileHash.class);
SubscriberId sender = headerOrNull(conn, "Serval-Rhizome-Bundle-Sender", SubscriberId.class);
SubscriberId recipient = headerOrNull(conn, "Serval-Rhizome-Bundle-Recipient", SubscriberId.class);
BundleKey BK = headerOrNull(conn, "Serval-Rhizome-Bundle-BK", BundleKey.class);
Integer crypt = headerIntegerOrNull(conn, "Serval-Rhizome-Bundle-Crypt");
Long tail = headerUnsignedLongOrNull(conn, "Serval-Rhizome-Bundle-Tail");
Long date = headerUnsignedLongOrNull(conn, "Serval-Rhizome-Bundle-Date");
String service = conn.getHeaderField("Serval-Rhizome-Bundle-Service");
String name = headerQuotedStringOrNull(conn, "Serval-Rhizome-Bundle-Name");
return new RhizomeManifest(id, version, filesize, filehash, sender, recipient, BK, crypt, tail, date, service, name);
}
private static String headerString(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
String str = conn.getHeaderField(header);
if (str == null)
throw new ServalDInterfaceException("missing header field: " + header);
return str;
}
private static String headerQuotedStringOrNull(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
String quoted = conn.getHeaderField(header);
if (quoted == null)
return null;
if (quoted.length() == 0 || quoted.charAt(0) != '"')
throw new ServalDInterfaceException("malformed header field: " + header + ": missing quote at start of quoted-string");
boolean slosh = false;
boolean end = false;
StringBuilder b = new StringBuilder(quoted.length());
for (int i = 1; i < quoted.length(); ++i) {
char c = quoted.charAt(i);
if (end)
throw new ServalDInterfaceException("malformed header field: " + header + ": spurious character after quoted-string");
if (c < ' ' || c > '~')
throw new ServalDInterfaceException("malformed header field: " + header + ": invalid character in quoted-string");
if (slosh) {
b.append(c);
slosh = false;
}
else if (c == '"')
end = true;
else if (c == '\\')
slosh = true;
else
b.append(c);
}
if (!end)
throw new ServalDInterfaceException("malformed header field: " + header + ": missing quote at end of quoted-string");
return b.toString();
}
private static Integer headerIntegerOrNull(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
String str = conn.getHeaderField(header);
if (str == null)
return null;
try {
return Integer.valueOf(str);
}
catch (NumberFormatException e) {
}
throw new ServalDInterfaceException("invalid header field: " + header + ": " + str);
}
private static Long headerUnsignedLongOrNull(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
String str = conn.getHeaderField(header);
if (str == null)
return null;
try {
Long value = Long.valueOf(str);
if (value >= 0)
return value;
}
catch (NumberFormatException e) {
}
throw new ServalDInterfaceException("invalid header field: " + header + ": " + str);
}
private static long headerUnsignedLong(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
Long value = headerUnsignedLongOrNull(conn, header);
if (value == null)
throw new ServalDInterfaceException("missing header field: " + header);
return value;
}
private static <T> T headerOrNull(HttpURLConnection conn, String header, Class<T> cls) throws ServalDInterfaceException
{
String str = conn.getHeaderField(header);
if (str == null)
return null;
try {
return (T) cls.getConstructor(String.class).newInstance(str);
}
catch (InvocationTargetException e) {
throw new ServalDInterfaceException("invalid header field: " + header + ": " + str, e.getTargetException());
}
catch (Exception e) {
throw new ServalDInterfaceException("invalid header field: " + header + ": " + str, e);
}
}
private static <T> T header(HttpURLConnection conn, String header, Class<T> cls) throws ServalDInterfaceException
{
T value = headerOrNull(conn, header, cls);
if (value == null)
throw new ServalDInterfaceException("missing header field: " + header);
return value;
}
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}