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package ca.uhn.hl7v2.hoh.encoder;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.nio.charset.Charset;
import java.nio.charset.UnsupportedCharsetException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import ca.uhn.hl7v2.hoh.api.DecodeException;
import ca.uhn.hl7v2.hoh.api.NonHl7ResponseException;
import ca.uhn.hl7v2.hoh.sign.SignatureFailureException;
import ca.uhn.hl7v2.hoh.sign.SignatureVerificationException;
import ca.uhn.hl7v2.hoh.util.GZipUtils;
import ca.uhn.hl7v2.hoh.util.IOUtils;
import ca.uhn.hl7v2.hoh.util.StringUtils;
import ca.uhn.hl7v2.hoh.util.repackage.Base64;
public abstract class AbstractHl7OverHttpDecoder extends AbstractHl7OverHttp {
private static final Pattern WHITESPACE_PATTERN = Pattern.compile("\\s+");
/**
* Default amount of time that the decoder will attempt to read before
* timing out and throwing an IOException (30000ms)
*
* @see #setReadTimeout(long)
*/
public static final int DEFAULT_READ_TIMEOUT = 30 * 1000;
private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(AbstractHl7OverHttpDecoder.class);
private byte[] myBytes;
private List myConformanceProblems;
private int myContentLength = -1;
private String myContentType;
private boolean myGzipCoding;
private long myLastStartedReading;
private long myReadTimeout = DEFAULT_READ_TIMEOUT;
private String myResponseName;
private Integer myResponseStatus;
private TransferEncoding myTransferEncoding;
private String mySignature;
private EncodingStyle myEncodingStyle;
private void addConformanceProblem(String theString) {
ourLog.debug("Conformance problem detected: {}", theString);
if (myConformanceProblems == null) {
myConformanceProblems = new ArrayList();
}
myConformanceProblems.add(theString);
}
protected abstract void authorize() throws AuthorizationFailureException;
public void decode() throws DecodeException, SignatureVerificationException {
verifyNotUsed();
decodeHeaders();
authorize();
decodeBody();
verifySignature();
}
private void decodeBody() throws DecodeException {
byte[] bytes = myBytes;
if (myGzipCoding) {
ourLog.debug("Decoding message contents using GZIP encoding style");
try {
bytes = GZipUtils.uncompress(bytes);
} catch (IOException e) {
throw new DecodeException("Failed to uncompress GZip content", e);
}
}
Charset charset = getCharset();
ourLog.debug("Message is {} bytes with charset {}", bytes.length, charset.name());
String messageString = new String(bytes, charset);
setMessage(messageString);
}
private void decodeHeaders() throws DecodeException {
ourLog.trace("Headers are: {}", getHeaders());
for (Map.Entry nextEntry : getHeaders().entrySet()) {
String nextHeader = nextEntry.getKey().toLowerCase();
String nextValue = nextEntry.getValue();
if ("transfer-encoding".equals(nextHeader)) {
if ("chunked".equalsIgnoreCase(nextValue)) {
myTransferEncoding = TransferEncoding.CHUNKED;
} else {
throw new DecodeException("Unknown transfer encoding: " + nextValue);
}
} else if ("content-length".equals(nextHeader)) {
try {
myContentLength = Integer.parseInt(nextValue);
} catch (NumberFormatException e) {
addConformanceProblem("Could not parse Content-Length header value: " + nextHeader);
}
} else if ("content-type".equals(nextHeader)) {
int colonIndex = nextValue.indexOf(';');
if (colonIndex == -1) {
myContentType = nextValue;
} else {
myContentType = nextValue.substring(0, colonIndex);
myEncodingStyle = EncodingStyle.withNameCaseInsensitive(myContentType);
String charsetDef = nextValue.substring(colonIndex + 1).trim();
if (charsetDef.startsWith("charset=")) {
String charsetName = charsetDef.substring(8);
Charset charset;
try {
charset = Charset.forName(charsetName);
} catch (UnsupportedCharsetException e) {
addConformanceProblem("Unsupported or invalid charset: " + charsetName);
continue;
}
setCharset(charset);
}
}
myContentType = myContentType.trim();
} else if ("authorization".equals(nextHeader)) {
int spaceIndex = nextValue.indexOf(' ');
if (spaceIndex == -1) {
throw new DecodeException("Invalid authorization header. No authorization style detected");
}
String type = nextValue.substring(0, spaceIndex);
if ("basic".equalsIgnoreCase(type)) {
String encodedCredentials = nextValue.substring(spaceIndex + 1);
byte[] decodedCredentials = Base64.decodeBase64(encodedCredentials);
String credentialsString = new String(decodedCredentials, getDefaultCharset());
int colonIndex = credentialsString.indexOf(':');
if (colonIndex == -1) {
setUsername(credentialsString);
} else {
setUsername(credentialsString.substring(0, colonIndex));
setPassword(credentialsString.substring(colonIndex + 1));
}
} else {
addConformanceProblem("Invalid authorization type. Only basic authorization is supported.");
}
} else if ("content-coding".equals(nextHeader)) {
if (StringUtils.isNotBlank(nextValue)) {
if ("gzip".equals(nextValue)) {
myGzipCoding = true;
} else {
throw new DecodeException("Unknown content-coding: " + nextValue);
}
}
} else if (HTTP_HEADER_HL7_SIGNATURE_LC.equals(nextHeader)) {
mySignature = nextValue;
}
}
}
/**
* Returns the {@link EncodingStyle} associated with the incoming message,
* or null. This will be set automatically based on the value
* of the Content-Type header, and will be set to
* null if the content type is not provided, or if the content
* type does not correspond to an HL7 type.
*
* @see {@link EncodingStyle} for a list of appropriate content types
*/
public EncodingStyle getEncodingStyle() {
return myEncodingStyle;
}
private void doReadContentsFromInputStreamAndDecode(InputStream theInputStream) throws DecodeException, AuthorizationFailureException, IOException, SignatureVerificationException {
decodeHeaders();
authorize();
if (myTransferEncoding == TransferEncoding.CHUNKED) {
myBytes = readBytesChunked(theInputStream);
} else {
myBytes = readBytesNonChunked(theInputStream);
}
decodeBody();
if (getContentType() == null) {
throw new DecodeException("Content-Type not specified");
}
if (getEncodingStyle() == null) {
throw new NonHl7ResponseException("Invalid Content-Type: " + getContentType(), getContentType(), getMessage());
}
verifySignature();
}
private byte[] readBytesChunked(InputStream theInputStream) throws DecodeException, IOException {
ourLog.debug("Decoding message bytes using CHUNKED encoding style");
byte[] byteBuffer = new byte[IOUtils.DEFAULT_BUFFER_SIZE];
ByteArrayOutputStream bos = new ByteArrayOutputStream(IOUtils.DEFAULT_BUFFER_SIZE);
while (true) {
String nextSize;
try {
nextSize = readLine(theInputStream);
} catch (IOException e) {
throw new DecodeException("Failed to decode CHUNKED encoding", e);
}
if (nextSize.length() == 0) {
break;
}
int nextSizeInt;
try {
nextSizeInt = Integer.parseInt(nextSize, 16);
} catch (NumberFormatException e) {
throw new DecodeException("Failed to decode CHUNKED encoding", e);
}
ourLog.debug("Next CHUNKED size: {}", nextSizeInt);
if (nextSizeInt < 0) {
throw new DecodeException("Received invalid octet count in chunked transfer encoding: " + nextSize);
}
if (nextSizeInt > 0) {
int totalRead = 0;
myLastStartedReading = System.currentTimeMillis();
do {
int nextRead = Math.min(nextSizeInt, byteBuffer.length);
int bytesRead = theInputStream.read(byteBuffer, 0, nextRead);
if (bytesRead == -1) {
throw new DecodeException("Reached EOF while reading in message chunk");
}
if (bytesRead == 0 && totalRead < nextSizeInt) {
pauseDuringTimedOutRead();
}
totalRead += bytesRead;
ourLog.debug("Read {} byte chunk", bytesRead);
bos.write(byteBuffer, 0, bytesRead);
} while (totalRead < nextSizeInt);
}
// Try to read a trailing CRLF
int nextChar;
boolean had13 = false;
boolean had10 = false;
boolean trailing = false;
while (true) {
try {
nextChar = theInputStream.read();
} catch (SocketTimeoutException e) {
break;
}
if (nextChar == -1) {
break;
} else if (nextChar == 13) {
if (had13) {
/*
* This is an attempt to be tolerant of people using the wrong
* end of line sequence (it should be CRLF), as is the
* had10 below
*/
trailing = true;
}
had13 = true;
continue;
} else if (nextChar == 10) {
if (had10) {
trailing = true;
}
continue;
} else {
break;
}
}
if (trailing) {
break;
}
} // while
return bos.toByteArray();
}
private void verifySignature() throws SignatureVerificationException, DecodeException {
if (getSigner() != null && StringUtils.isBlank(mySignature)) {
String mode = (this instanceof Hl7OverHttpRequestDecoder) ? "request" : "response";
throw new SignatureVerificationException("No HL7 Signature found in " + mode);
}
if (getSigner() != null) {
try {
getSigner().verify(myBytes, mySignature);
} catch (SignatureFailureException e) {
throw new DecodeException("Failed to verify signature due to an error (signature may possibly be valid, but verification failed)", e);
}
}
}
public List getConformanceProblems() {
if (myConformanceProblems == null) {
myConformanceProblems = new ArrayList();
}
return myConformanceProblems;
}
/**
* @return Returns the content type associated with the message (e.g. application/hl7-v2)
*/
public String getContentType() {
return myContentType;
}
/**
* @return the responseName
*/
public String getResponseName() {
return myResponseName;
}
/**
* @return the responseStatus
*/
public Integer getResponseStatus() {
return myResponseStatus;
}
protected abstract String readActionLineAndDecode(InputStream theInputStream) throws IOException, NoMessageReceivedException, DecodeException;
private byte[] readBytesNonChunked(InputStream theInputStream) throws IOException {
int length = myContentLength > 0 ? myContentLength : IOUtils.DEFAULT_BUFFER_SIZE;
ByteArrayOutputStream bos = new ByteArrayOutputStream(length);
byte[] buffer = new byte[IOUtils.DEFAULT_BUFFER_SIZE];
myLastStartedReading = System.currentTimeMillis();
while ((myContentLength < 0 || bos.size() < myContentLength)) {
if (myContentLength < 0) {
try {
if (theInputStream.available() <= 0) {
break;
}
} catch (IOException e) {
ourLog.debug("Received IOException while calling inputStream#available()", e);
throw e;
}
}
int max = buffer.length;
if (myContentLength > 0) {
max = myContentLength - bos.size();
}
try {
int bytesRead = theInputStream.read(buffer, 0, max);
myLastStartedReading = System.currentTimeMillis();
if (bytesRead == -1) {
break;
}
bos.write(buffer, 0, bytesRead);
} catch (SocketTimeoutException e) {
long elapsed = System.currentTimeMillis() - myLastStartedReading;
if (elapsed > myReadTimeout) {
throw e;
} else {
ourLog.debug("Trying to read for {} / {}ms, going to keep trying", elapsed, myReadTimeout);
try {
Thread.sleep(100);
} catch (InterruptedException e1) {
// ignore
}
}
} catch (IOException e) {
ourLog.debug("Received IOException while calling inputStream#available()", e);
throw e;
}
}
return bos.toByteArray();
}
/**
* Read in the contents of the raw message from the input stream and decode
* entire the message. This method assumes that the headers have been
* provided using {@link #setHeaders(LinkedHashMap)}
*
* @param theInputStream
* The inputstream to read the raw message from
* @throws AuthorizationFailureException
* If the authorization check fails. This will only be thrown if
* this decoder is decoding a request message, and an
* authorization callback has been provided, and the
* authorization fails.
* @throws DecodeException
* If the message can not be decoded for any reason
* @throws IOException
* If there is a failure while reading from the inputstream
* @throws SignatureVerificationException
* If the signature verification fails. This will only occur if
* {@link #setSigner(ca.uhn.hl7v2.hoh.sign.ISigner) a signer}
* has been provided.
*/
public void readContentsFromInputStreamAndDecode(InputStream theInputStream) throws AuthorizationFailureException, DecodeException, IOException, SignatureVerificationException {
verifyNotUsed();
doReadContentsFromInputStreamAndDecode(theInputStream);
}
protected String readFirstLine(InputStream theInputStream) throws IOException, NoMessageReceivedException {
return readLine(theInputStream, true);
}
/**
* Note that if {@link #setUri(String)} is called, this method will assume
* that the first line of the HTTP request has already been read from the
* input stream. If {@link #setHeaders(java.util.LinkedHashMap)} has been
* called, this method will assume that the HTTP headers have already been
* read from the input stream as well as the double-LF (ASCII-10) that
* proceeds the headers.
*
*
* @param theInputStream
* The inputstream to read the raw message from
* @throws AuthorizationFailureException
* If the authorization check fails. This will only be thrown if
* this decoder is decoding a request message, and an
* authorization callback has been provided, and the
* authorization fails.
* @throws DecodeException
* If the message can not be decoded for any reason
* @throws IOException
* If there is a failure while reading from the inputstream
* @throws SignatureVerificationException
* If the signature verification fails. This will only occur if
* {@link #setSigner(ca.uhn.hl7v2.hoh.sign.ISigner) a signer}
* has been provided.
*/
public void readHeadersAndContentsFromInputStreamAndDecode(InputStream theInputStream) throws IOException, DecodeException, NoMessageReceivedException, SignatureVerificationException {
verifyNotUsed();
String actionLine = readActionLineAndDecode(theInputStream);
ourLog.debug("Read action line: {}", actionLine);
if (getHeaders() == null) {
setHeaders(new LinkedHashMap());
while (true) {
String nextLine = readLine(theInputStream);
if (nextLine.length() == 0) {
break;
}
int colonIndex = nextLine.indexOf(':');
if (colonIndex == -1) {
throw new DecodeException("Invalid HTTP header line detected. Value is: " + nextLine);
}
String key = nextLine.substring(0, colonIndex);
String value = nextLine.substring(colonIndex + 1).trim();
getHeaders().put(key, value);
}
}
doReadContentsFromInputStreamAndDecode(theInputStream);
}
private String readLine(InputStream theInputStream) throws IOException {
try {
return readLine(theInputStream, false);
} catch (NoMessageReceivedException e) {
throw new Error("Threw a NoMessageReceivedException. This should not happen.", e);
}
}
private String readLine(InputStream theInputStream, boolean theFirstLine) throws IOException, NoMessageReceivedException {
myLastStartedReading = System.currentTimeMillis();
StringBuilder retVal = new StringBuilder();
while (true) {
int b;
try {
b = theInputStream.read();
} catch (SocketTimeoutException e) {
if (retVal.length() == 0 && theFirstLine) {
throw new NoMessageReceivedException();
}
pauseDuringTimedOutRead();
continue;
}
if (b == 13) {
continue;
} else if (b == 10) {
break;
} else if (b == -1) {
ourLog.info("Read -1 from input stream, closing it");
theInputStream.close();
if (retVal.length() == 0) {
throw new SocketException("Received EOF from input stream");
}
break;
} else if (b < ' ') {
continue;
} else {
retVal.append((char) b);
}
}
return WHITESPACE_PATTERN.matcher(retVal.toString()).replaceAll(" ").trim();
}
private void pauseDuringTimedOutRead() throws SocketTimeoutException {
long elapsed = System.currentTimeMillis() - myLastStartedReading;
if (elapsed > myReadTimeout) {
throw new SocketTimeoutException();
}
try {
Thread.sleep(100);
} catch (InterruptedException e1) {
// ignore
}
}
/**
* Sets the number of milliseconds that the decoder will attempt to read
* from an InputStream before timing out and throwing an exception
*/
public void setReadTimeout(long theReadTimeout) {
myReadTimeout = theReadTimeout;
}
/**
* @param theResponseName
* the responseName to set
*/
public void setResponseName(String theResponseName) {
myResponseName = theResponseName;
}
/**
* @param theResponseStatus
* the responseStatus to set
*/
public void setResponseStatus(Integer theResponseStatus) {
myResponseStatus = theResponseStatus;
}
}
