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package cloud.genesys.webmessaging.sdk.connector.apache;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import cloud.genesys.webmessaging.sdk.DetailLevel;
import org.apache.http.Header;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.RequestLine;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.message.BasicRequestLine;
import org.apache.http.protocol.HttpContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A filter that logs both requests and responses to SLF4J.
*
* Available detail levels
*
* NONE - don't log anything
* MINIMAL - only log the verb, url, and response code
* HEADERS - as above, but also log all the headers for both the request and response
* FULL - as above, but also log the full body for both the request and response
*/
public class SLF4JInterceptor implements HttpRequestInterceptor, HttpResponseInterceptor {
private static final Logger LOGGER = LoggerFactory.getLogger(SLF4JInterceptor.class);
// Attribute for tracking requests and responses
private static final String SLF4J_REQUEST_DATA = "slf4j-request-data";
private volatile DetailLevel detailLevel;
public SLF4JInterceptor() {
this(DetailLevel.MINIMAL);
}
public SLF4JInterceptor(DetailLevel detailLevel) {
this.detailLevel = detailLevel;
}
/**
* @return the current detail level of the filter
*/
public DetailLevel getDetailLevel() {
return detailLevel;
}
/**
* Sets the detail level
* @param detailLevel - the new detail level to use
*/
public void setDetailLevel(DetailLevel detailLevel) {
this.detailLevel = detailLevel;
}
private static class RequestData {
public final RequestLine requestLine;
public final long startTime;
private RequestData(RequestLine requestLine, long startTime) {
this.requestLine = requestLine;
this.startTime = startTime;
}
}
@Override
public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
if (LOGGER.isDebugEnabled()) {
RequestData requestData = new RequestData(request.getRequestLine(), System.currentTimeMillis());
context.setAttribute(SLF4J_REQUEST_DATA, requestData);
logRequest(request);
}
}
@Override
public void process(HttpResponse response, HttpContext context) throws HttpException, IOException {
if (LOGGER.isDebugEnabled()) {
RequestLine requestLine;
long tookMs;
Object reqDataAttr = context.getAttribute(SLF4J_REQUEST_DATA);
if (reqDataAttr == null || !(reqDataAttr instanceof RequestData)) {
LOGGER.error("Could not determine the request associated with this response");
requestLine = new BasicRequestLine("", "", null);
tookMs = -1;
} else {
RequestData requestData = (RequestData) reqDataAttr;
requestLine = requestData.requestLine;
tookMs = System.currentTimeMillis() - requestData.startTime;
}
logResponse(response, requestLine, tookMs);
}
}
/**
* Builds the log message for requests
*
*
* >>>> GET http://api.example.com/endpoint >>>>
* ---- HEADERS ----
* Header-1: Value1
* Header-2: Value2
* ---- BODY (24-bytes) ----
* Body body body body body
* >>>> END >>>>
*
*
* @param request - the request to build a message for
*/
private void logRequest(HttpRequest request) throws IOException {
if (detailLevel.compareTo(DetailLevel.MINIMAL) >= 0) {
final StringBuilder messageBuilder = new StringBuilder();
// Log the verb and url
String uriString = String.format(">>>> %s %s >>>>", request.getRequestLine().getMethod(), request.getRequestLine().getUri());
messageBuilder.append(uriString).append(System.lineSeparator());
// Add the headers
if (detailLevel.compareTo(DetailLevel.HEADERS) >= 0) {
messageBuilder.append("---- HEADERS ----").append(System.lineSeparator());
messageBuilder.append(formatHeaders(request.getAllHeaders()));
// Add the request body if it exists
if (detailLevel.compareTo(DetailLevel.FULL) >= 0) {
// This is ugly, but it's the only way to access the body
if (request instanceof HttpEntityEnclosingRequest &&
((HttpEntityEnclosingRequest) request).getEntity() != null) {
byte[] data = extractRequestBody((HttpEntityEnclosingRequest) request);
messageBuilder.append(String.format("---- BODY (%d bytes) ----", data.length)).append(System.lineSeparator());
messageBuilder.append(new String(data)).append(System.lineSeparator());
} else {
messageBuilder.append("---- NO BODY ----").append(System.lineSeparator());
}
}
messageBuilder.append(">>>> END >>>>").append(System.lineSeparator());
}
LOGGER.debug(messageBuilder.toString());
}
}
/**
* Builds the log message for responses
*
*
* <<<< GET http://api.example.com/endpoint <<<<
* 404 Not Found (219 ms)
* ---- HEADERS ----
* Header-3: Value3
* Header-4: Value4
* ---- NO BODY ----
* <<<< END <<<<
*
*
* @param response - the response to build a message for
* @param requestLine - the request line of the initial request for the response
* @param tookMs - how long the request took, in milliseconds
*/
private void logResponse(HttpResponse response, RequestLine requestLine, long tookMs) throws IOException {
if (detailLevel.compareTo(DetailLevel.MINIMAL) >= 0) {
StringBuilder messageBuilder = new StringBuilder();
// Log the verb and url, along with the status code
String uriString = String.format("<<<< %s %s <<<<", requestLine.getMethod(), requestLine.getUri());
messageBuilder.append(uriString).append(System.lineSeparator());
messageBuilder.append(String.format(" %d %s (%d ms)",
response.getStatusLine().getStatusCode(),
response.getStatusLine().getReasonPhrase(),
tookMs))
.append(System.lineSeparator());
// Append the headers
if (detailLevel.compareTo(DetailLevel.HEADERS) >= 0) {
messageBuilder.append("---- HEADERS ----").append(System.lineSeparator());
messageBuilder.append(formatHeaders(response.getAllHeaders()));
// Add the response body if it exists
if (detailLevel.compareTo(DetailLevel.FULL) >= 0) {
// Write the log message
if (response.getEntity() != null) {
byte[] responseBody = extractResponseBody(response);
messageBuilder.append(String.format("---- BODY (%d bytes) ----", responseBody.length)).append(System.lineSeparator());
messageBuilder.append(new String(responseBody)).append(System.lineSeparator());
} else {
messageBuilder.append("---- NO BODY ----").append(System.lineSeparator());
}
}
messageBuilder.append("<<<< END <<<<").append(System.lineSeparator());
}
LOGGER.debug(messageBuilder.toString());
}
}
/**
* Extracts the body of a request, resetting the stream if necessary so
* that the request behaves as if it were unchanged
*
* @return the body of the response
*/
private static final byte[] extractRequestBody(HttpEntityEnclosingRequest request) throws IOException {
byte[] data = toByteArray(request.getEntity().getContent());
// Reset the response input stream if necessary
if (!request.getEntity().isRepeatable()) {
request.setEntity(new ByteArrayEntity(data, ContentType.get(request.getEntity())));
}
return data;
}
/**
* Extracts the body of a response, resetting the stream if necessary so
* that the response behaves as if it were unchanged
*
* @return the body of the response
*/
private static final byte[] extractResponseBody(HttpResponse response) throws IOException {
byte[] data = toByteArray(response.getEntity().getContent());
// Reset the response input stream if necessary
if (!response.getEntity().isRepeatable()) {
response.setEntity(new ByteArrayEntity(data, ContentType.get(response.getEntity())));
}
return data;
}
/**
* Reads an input stream into a byte array, then closes the stream
*
* @return an array containing all of the data from the stream
*/
private static final byte[] toByteArray(InputStream response) throws IOException {
final int BUFFER_SIZE = 2048; // How many bytes to copy at once
// Clone the stream by reading it into a byte array
byte[] buffer = new byte[BUFFER_SIZE];
ByteArrayOutputStream byteArrayStream = new ByteArrayOutputStream();
try (InputStream stream = response) {
int read;
while ((read = stream.read(buffer)) != -1) {
byteArrayStream.write(buffer, 0, read);
}
byteArrayStream.flush();
}
return byteArrayStream.toByteArray();
}
private static class HeaderComparator implements Comparator {
@Override
public int compare(Header a, Header b) {
return a.getName().compareTo(b.getName());
}
}
/**
* Formats an array of headers into a human-readable format
* @param headers - the headers
* @return a string containing all of the headers
*/
private static String formatHeaders(Header[] headers) {
List sortedHeaders = Arrays.asList(headers);
Collections.sort(sortedHeaders, new HeaderComparator());
StringBuilder sb = new StringBuilder();
for (Header header : sortedHeaders) {
String headerString = String.format("%s: %s", header.getName(), header.getValue());
sb.append(headerString).append(System.lineSeparator());
}
return sb.toString();
}
}
