/**
* 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.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import java.util.List;
import java.io.IOException;
import java.io.PrintStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
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;
import org.servalproject.servaldna.ServalDNotImplementedException;
public class RhizomeCommon
{
private static class Status {
InputStream input_stream;
public int http_status_code;
public String http_status_message;
RhizomeBundleStatus bundle_status_code;
String bundle_status_message;
RhizomePayloadStatus payload_status_code;
String payload_status_message;
}
private static void dumpStatus(Status status, PrintStream out)
{
out.println("input_stream=" + status.input_stream);
out.println("http_status_code=" + status.http_status_code);
out.println("http_status_message=" + status.http_status_message);
out.println("bundle_status_code=" + status.bundle_status_code);
out.println("bundle_status_message=" + status.bundle_status_message);
out.println("payload_status_code=" + status.payload_status_code);
out.println("payload_status_message=" + status.payload_status_message);
}
protected static Status receiveResponse(HttpURLConnection conn, int expected_response_code) throws IOException, ServalDInterfaceException
{
int[] expected_response_codes = { expected_response_code };
return receiveResponse(conn, expected_response_codes);
}
protected static Status receiveResponse(HttpURLConnection conn, int[] expected_response_codes) throws IOException, ServalDInterfaceException
{
Status status = new Status();
status.http_status_code = conn.getResponseCode();
status.http_status_message = conn.getResponseMessage();
for (int code: expected_response_codes) {
if (status.http_status_code == code) {
status.input_stream = conn.getInputStream();
return status;
}
}
if (!conn.getContentType().equals("application/json"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
if (status.http_status_code >= 300) {
JSONTokeniser json = new JSONTokeniser(new InputStreamReader(conn.getErrorStream(), "US-ASCII"));
decodeRestfulStatus(status, json);
}
if (status.http_status_code == HttpURLConnection.HTTP_FORBIDDEN)
return status;
if (status.http_status_code == HttpURLConnection.HTTP_NOT_IMPLEMENTED)
throw new ServalDNotImplementedException(status.http_status_message);
throw new ServalDInterfaceException("unexpected HTTP response: " + status.http_status_code + " " + status.http_status_message);
}
protected static ServalDInterfaceException unexpectedResponse(HttpURLConnection conn, Status status)
{
return new ServalDInterfaceException(
"unexpected Rhizome failure, " + quoteString(status.http_status_message)
+ (status.bundle_status_code == null ? "" : ", " + status.bundle_status_code)
+ (status.bundle_status_message == null ? "" : " " + quoteString(status.bundle_status_message))
+ (status.payload_status_code == null ? "" : ", " + status.payload_status_code)
+ (status.payload_status_message == null ? "" : " " + quoteString(status.payload_status_message))
+ " from " + conn.getURL()
);
}
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
{
Status status = 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(status.input_stream, "US-ASCII"));
}
protected static void decodeHeaderBundleStatus(Status status, HttpURLConnection conn) throws ServalDInterfaceException
{
status.bundle_status_code = header(conn, "Serval-Rhizome-Result-Bundle-Status-Code", RhizomeBundleStatus.class);
status.bundle_status_message = headerString(conn, "Serval-Rhizome-Result-Bundle-Status-Message");
}
protected static void decodeHeaderPayloadStatus(Status status, HttpURLConnection conn) throws ServalDInterfaceException
{
status.payload_status_code = header(conn, "Serval-Rhizome-Result-Payload-Status-Code", RhizomePayloadStatus.class);
status.payload_status_message = headerString(conn, "Serval-Rhizome-Result-Payload-Status-Message");
}
protected static void decodeRestfulStatus(Status status, JSONTokeniser json) throws IOException, ServalDInterfaceException
{
try {
json.consume(JSONTokeniser.Token.START_OBJECT);
json.consume("http_status_code");
json.consume(JSONTokeniser.Token.COLON);
int hs = json.consume(Integer.class);
json.consume(JSONTokeniser.Token.COMMA);
if (status.http_status_code == 0)
status.http_status_code = json.consume(Integer.class);
else if (hs != status.http_status_code)
throw new ServalDInterfaceException("JSON/header conflict"
+ ", http_status_code=" + hs
+ " but HTTP response code is " + status.http_status_code);
json.consume("http_status_message");
json.consume(JSONTokeniser.Token.COLON);
status.http_status_message = json.consume(String.class);
Object tok = json.nextToken();
while (tok == JSONTokeniser.Token.COMMA) {
String label = json.consume(String.class);
json.consume(JSONTokeniser.Token.COLON);
if (label.equals("rhizome_bundle_status_code")) {
RhizomeBundleStatus bs = RhizomeBundleStatus.fromCode(json.consume(Integer.class));
if (status.bundle_status_code == null)
status.bundle_status_code = bs;
else if (status.bundle_status_code != bs)
throw new ServalDInterfaceException("JSON/header conflict"
+ ", rhizome_bundle_status_code=" + bs.code
+ " but Serval-Rhizome-Result-Bundle-Status-Code: " + status.bundle_status_code.code);
}
else if (label.equals("rhizome_bundle_status_message")) {
String message = json.consume(String.class);
if (status.bundle_status_message == null)
status.bundle_status_message = message;
else if (!status.bundle_status_message.equals(message))
throw new ServalDInterfaceException("JSON/header conflict"
+ ", rhizome_bundle_status_message=" + message
+ " but Serval-Rhizome-Result-Bundle-Status-Message: " + status.bundle_status_message);
}
else if (label.equals("rhizome_payload_status_code")) {
RhizomePayloadStatus bs = RhizomePayloadStatus.fromCode(json.consume(Integer.class));
if (status.payload_status_code == null)
status.payload_status_code = bs;
else if (status.payload_status_code != bs)
throw new ServalDInterfaceException("JSON/header conflict"
+ ", rhizome_payload_status_code=" + bs.code
+ " but Serval-Rhizome-Result-Payload-Status-Code: " + status.payload_status_code.code);
}
else if (label.equals("rhizome_payload_status_message")) {
String message = json.consume(String.class);
if (status.payload_status_message == null)
status.payload_status_message = message;
else if (!status.payload_status_message.equals(message))
throw new ServalDInterfaceException("JSON/header conflict"
+ ", rhizome_payload_status_message=" + message
+ " but Serval-Rhizome-Result-Payload-Status-Code: " + status.payload_status_message);
}
else
json.unexpected(label);
tok = json.nextToken();
}
json.match(tok, JSONTokeniser.Token.END_OBJECT);
json.consume(JSONTokeniser.Token.EOF);
}
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();
Status status = RhizomeCommon.receiveResponse(conn, HttpURLConnection.HTTP_OK);
try {
dumpHeaders(conn, System.err);
decodeHeaderBundleStatus(status, conn);
dumpStatus(status, System.err);
switch (status.bundle_status_code) {
case NEW:
return null;
case SAME:
if (!conn.getContentType().equals("rhizome-manifest/text"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
RhizomeManifest manifest = RhizomeManifest.fromTextFormat(status.input_stream);
BundleExtra extra = bundleExtraFromHeaders(conn);
return new RhizomeManifestBundle(manifest, extra.rowId, extra.insertTime, extra.author, extra.secret);
case ERROR:
throw new ServalDFailureException("received rhizome_bundle_status_code=ERROR(-1) from " + conn.getURL());
}
}
catch (RhizomeManifestParseException e) {
throw new ServalDInterfaceException("malformed manifest from daemon", e);
}
finally {
if (status.input_stream != null)
status.input_stream.close();
}
throw unexpectedResponse(conn, status);
}
public static RhizomePayloadRawBundle rhizomePayloadRaw(ServalDHttpConnectionFactory connector, BundleId bid)
throws IOException, ServalDInterfaceException
{
HttpURLConnection conn = connector.newServalDHttpConnection("/restful/rhizome/" + bid.toHex() + "/raw.bin");
conn.connect();
Status status = RhizomeCommon.receiveResponse(conn, HttpURLConnection.HTTP_OK);
try {
dumpHeaders(conn, System.err);
decodeHeaderBundleStatus(status, conn);
dumpStatus(status, System.err);
switch (status.bundle_status_code) {
case ERROR:
throw new ServalDFailureException("received rhizome_bundle_status_code=ERROR(-1) from " + conn.getURL());
case NEW: // No manifest
return null;
case SAME:
decodeHeaderPayloadStatus(status, conn);
switch (status.payload_status_code) {
case ERROR:
throw new ServalDFailureException("received rhizome_payload_status_code=ERROR(-1) from " + conn.getURL());
case NEW:
// The manifest is known but the payload is unavailable, so return a bundle
// object with a null input stream.
// FALL THROUGH
case EMPTY:
if (status.input_stream != null) {
status.input_stream.close();
status.input_stream = null;
}
// FALL THROUGH
case STORED: {
if (status.input_stream != null && !conn.getContentType().equals("application/octet-stream"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
RhizomeManifest manifest = manifestFromHeaders(conn);
BundleExtra extra = bundleExtraFromHeaders(conn);
RhizomePayloadRawBundle ret = new RhizomePayloadRawBundle(manifest, status.input_stream, extra.rowId, extra.insertTime, extra.author, extra.secret);
status.input_stream = null; // don't close when we return
return ret;
}
}
}
}
finally {
if (status.input_stream != null)
status.input_stream.close();
}
throw unexpectedResponse(conn, status);
}
public static RhizomePayloadBundle rhizomePayload(ServalDHttpConnectionFactory connector, BundleId bid)
throws IOException, ServalDInterfaceException, RhizomeDecryptionException
{
HttpURLConnection conn = connector.newServalDHttpConnection("/restful/rhizome/" + bid.toHex() + "/decrypted.bin");
conn.connect();
Status status = RhizomeCommon.receiveResponse(conn, HttpURLConnection.HTTP_OK);
try {
dumpHeaders(conn, System.err);
decodeHeaderBundleStatus(status, conn);
dumpStatus(status, System.err);
switch (status.bundle_status_code) {
case ERROR:
throw new ServalDFailureException("received rhizome_bundle_status_code=ERROR(-1) from " + conn.getURL());
case NEW: // No manifest
return null;
case SAME:
decodeHeaderPayloadStatus(status, conn);
switch (status.payload_status_code) {
case ERROR:
throw new ServalDFailureException("received rhizome_payload_status_code=ERROR(-1) from " + conn.getURL());
case CRYPTO_FAIL:
throw new RhizomeDecryptionException(conn.getURL());
case NEW:
// The manifest is known but the payload is unavailable, so return a bundle
// object with a null input stream.
// FALL THROUGH
case EMPTY:
if (status.input_stream != null) {
status.input_stream.close();
status.input_stream = null;
}
// FALL THROUGH
case STORED: {
if (status.input_stream != null && !conn.getContentType().equals("application/octet-stream"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type: " + conn.getContentType());
RhizomeManifest manifest = manifestFromHeaders(conn);
BundleExtra extra = bundleExtraFromHeaders(conn);
RhizomePayloadBundle ret = new RhizomePayloadBundle(manifest, status.input_stream, extra.rowId, extra.insertTime, extra.author, extra.secret);
status.input_stream = null; // don't close when we return
return ret;
}
}
}
}
finally {
if (status.input_stream != null)
status.input_stream.close();
}
throw unexpectedResponse(conn, status);
}
public static RhizomeInsertBundle rhizomeInsert(ServalDHttpConnectionFactory connector,
SubscriberId author,
RhizomeIncompleteManifest manifest,
BundleSecret secret)
throws ServalDInterfaceException,
IOException,
RhizomeInvalidManifestException,
RhizomeFakeManifestException,
RhizomeInconsistencyException,
RhizomeReadOnlyException,
RhizomeEncryptionException
{
return rhizomeInsert(connector, author, manifest, secret, null, null);
}
public static RhizomeInsertBundle rhizomeInsert(ServalDHttpConnectionFactory connector,
SubscriberId author,
RhizomeIncompleteManifest manifest,
BundleSecret secret,
InputStream payloadStream,
String fileName)
throws ServalDInterfaceException,
IOException,
RhizomeInvalidManifestException,
RhizomeFakeManifestException,
RhizomeInconsistencyException,
RhizomeReadOnlyException,
RhizomeEncryptionException
{
HttpURLConnection conn = connector.newServalDHttpConnection("/restful/rhizome/insert");
String boundary = Long.toHexString(System.currentTimeMillis());
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
conn.connect();
OutputStream ost = conn.getOutputStream();
PrintStream wr = new PrintStream(ost, false, "US-ASCII");
wr.print(new Object(){}.getClass().getEnclosingClass().getName());
if (author != null) {
wr.print("\r\n--" + boundary + "\r\n");
wr.print("Content-Disposition: form-data; name=\"bundle-author\"\r\n");
wr.print("Content-Type: serval-mesh/sid\r\n");
wr.print("Content-Transfer-Encoding: hex\r\n");
wr.print("\r\n");
wr.print(author.toHex());
}
if (secret != null) {
wr.print("\r\n--" + boundary + "\r\n");
wr.print("Content-Disposition: form-data; name=\"bundle-secret\"\r\n");
wr.print("Content-Type: rhizome/bundle-secret\r\n");
wr.print("Content-Transfer-Encoding: hex\r\n");
wr.print("\r\n");
wr.print(secret.toHex());
}
wr.print("\r\n--" + boundary + "\r\n");
wr.print("Content-Disposition: form-data; name=\"manifest\"\r\n");
wr.print("Content-Type: rhizome/manifest; format=\"text+binarysig\"\r\n");
wr.print("Content-Transfer-Encoding: binary\r\n");
wr.print("\r\n");
wr.flush();
manifest.toTextFormat(ost);
if (payloadStream != null) {
wr.print("\r\n--" + boundary + "\r\n");
wr.print("Content-Disposition: form-data; name=\"payload\"");
if (fileName != null) {
wr.print("; filename=");
wr.print(quoteString(fileName));
}
wr.print("\r\n");
wr.print("Content-Type: application/octet-stream\r\n");
wr.print("Content-Transfer-Encoding: binary\r\n");
wr.print("\r\n");
wr.flush();
byte[] buffer = new byte[4096];
int n;
while ((n = payloadStream.read(buffer)) > 0)
ost.write(buffer, 0, n);
}
wr.print("\r\n--" + boundary + "--\r\n");
wr.close();
int[] expected_response_codes = { HttpURLConnection.HTTP_OK, HttpURLConnection.HTTP_CREATED };
Status status = RhizomeCommon.receiveResponse(conn, expected_response_codes);
try {
dumpHeaders(conn, System.err);
decodeHeaderPayloadStatus(status, conn);
switch (status.payload_status_code) {
case ERROR:
dumpStatus(status, System.err);
throw new ServalDFailureException("received Rhizome payload_status=ERROR " + quoteString(status.payload_status_message) + " from " + conn.getURL());
case EMPTY:
case NEW:
case STORED:
decodeHeaderBundleStatus(status, conn);
dumpStatus(status, System.err);
switch (status.bundle_status_code) {
case ERROR:
throw new ServalDFailureException("received Rhizome bundle_status=ERROR " + quoteString(status.bundle_status_message) + " from " + conn.getURL());
case NEW:
case SAME:
case DUPLICATE:
case OLD:
case NO_ROOM: {
if (!conn.getContentType().equals("rhizome-manifest/text"))
throw new ServalDInterfaceException("unexpected HTTP Content-Type " + conn.getContentType() + " from " + conn.getURL());
RhizomeManifest returned_manifest = RhizomeManifest.fromTextFormat(status.input_stream);
BundleExtra extra = bundleExtraFromHeaders(conn);
return new RhizomeInsertBundle(status.bundle_status_code, returned_manifest, extra.rowId, extra.insertTime, extra.author, extra.secret);
}
case INVALID:
throw new RhizomeInvalidManifestException(status.bundle_status_message, conn.getURL());
case FAKE:
throw new RhizomeFakeManifestException(status.bundle_status_message, conn.getURL());
case INCONSISTENT:
throw new RhizomeInconsistencyException(status.bundle_status_message, conn.getURL());
case READONLY:
throw new RhizomeReadOnlyException(status.bundle_status_message, conn.getURL());
}
break;
case TOO_BIG:
case EVICTED:
dumpStatus(status, System.err);
return null;
case WRONG_SIZE:
case WRONG_HASH:
dumpStatus(status, System.err);
throw new RhizomeInconsistencyException(status.payload_status_message, conn.getURL());
case CRYPTO_FAIL:
dumpStatus(status, System.err);
throw new RhizomeEncryptionException(status.payload_status_message, conn.getURL());
}
}
catch (RhizomeManifestParseException e) {
throw new ServalDInterfaceException("malformed manifest from daemon", e);
}
finally {
if (status.input_stream != null)
status.input_stream.close();
}
dumpStatus(status, System.err);
throw unexpectedResponse(conn, status);
}
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 class BundleExtra {
public Long rowId;
public Long insertTime;
public SubscriberId author;
public BundleSecret secret;
}
private static BundleExtra bundleExtraFromHeaders(HttpURLConnection conn) throws ServalDInterfaceException
{
BundleExtra extra = new BundleExtra();
extra.rowId = headerUnsignedLongOrNull(conn, "Serval-Rhizome-Bundle-Rowid");
extra.insertTime = headerUnsignedLongOrNull(conn, "Serval-Rhizome-Bundle-Inserttime");
extra.author = headerOrNull(conn, "Serval-Rhizome-Bundle-Author", SubscriberId.class);
extra.secret = headerOrNull(conn, "Serval-Rhizome-Bundle-Secret", BundleSecret.class);
return extra;
}
private static String quoteString(String unquoted)
{
if (unquoted == null)
return "null";
StringBuilder b = new StringBuilder(unquoted.length() + 2);
b.append('"');
for (int i = 0; i < unquoted.length(); ++i) {
char c = unquoted.charAt(i);
if (c == '"' || c == '\\')
b.append('\\');
b.append(c);
}
b.append('"');
return b.toString();
}
private static String headerStringOrNull(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
return conn.getHeaderField(header);
}
private static String headerString(HttpURLConnection conn, String header) throws ServalDInterfaceException
{
String str = headerStringOrNull(conn, 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);
try {
try {
Constructor<T> constructor = cls.getConstructor(String.class);
if (str == null)
return null;
return constructor.newInstance(str);
}
catch (NoSuchMethodException e) {
}
try {
Method method = cls.getMethod("fromCode", Integer.TYPE);
if ((method.getModifiers() & Modifier.STATIC) != 0 && method.getReturnType() == cls) {
Integer integer = headerIntegerOrNull(conn, header);
if (integer == null)
return null;
return cls.cast(method.invoke(null, integer));
}
}
catch (NoSuchMethodException e) {
}
throw new ServalDInterfaceException("don't know how to instantiate: " + cls.getName());
}
catch (ServalDInterfaceException e) {
throw e;
}
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;
}
}