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davmail/src/java/davmail/caldav/CaldavConnection.java

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Java
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package davmail.caldav;
import davmail.AbstractConnection;
import davmail.Settings;
import davmail.exchange.ExchangeSession;
import davmail.exchange.ExchangeSessionFactory;
import davmail.tray.DavGatewayTray;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.auth.AuthenticationException;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* Handle a caldav connection.
*/
public class CaldavConnection extends AbstractConnection {
protected boolean closed = false;
// Initialize the streams and start the thread
public CaldavConnection(Socket clientSocket) {
super("CaldavConnection", clientSocket, "UTF-8");
}
protected Map<String, String> parseHeaders() throws IOException {
HashMap<String, String> headers = new HashMap<String, String>();
String line;
while ((line = readClient()) != null && line.length() > 0) {
int index = line.indexOf(':');
if (index <= 0) {
throw new IOException("Invalid header: " + line);
}
headers.put(line.substring(0, index).toLowerCase(), line.substring(index + 1).trim());
}
return headers;
}
protected String getContent(String contentLength) throws IOException {
if (contentLength == null || contentLength.length() == 0) {
return null;
} else {
int size;
try {
size = Integer.parseInt(contentLength);
} catch (NumberFormatException e) {
throw new IOException("Invalid content length: " + contentLength);
}
char[] buffer = new char[size];
int actualSize = in.read(buffer);
if (actualSize < 0) {
throw new IOException("End of stream reached reading content");
}
return new String(buffer, 0, actualSize);
}
}
protected void setSocketTimeout(String keepAliveValue) throws IOException {
if (keepAliveValue != null && keepAliveValue.length() > 0) {
int keepAlive;
try {
keepAlive = Integer.parseInt(keepAliveValue);
} catch (NumberFormatException e) {
throw new IOException("Invalid Keep-Alive: " + keepAliveValue);
}
if (keepAlive > 300) {
keepAlive = 300;
}
client.setSoTimeout(keepAlive * 1000);
DavGatewayTray.debug("Set socket timeout to " + keepAlive + " seconds");
}
}
public void run() {
String line;
StringTokenizer tokens;
try {
while (!closed) {
line = readClient();
// unable to read line, connection closed ?
if (line == null) {
break;
}
tokens = new StringTokenizer(line);
if (tokens.hasMoreTokens()) {
String command = tokens.nextToken();
Map<String, String> headers = parseHeaders();
if (tokens.hasMoreTokens()) {
String path = tokens.nextToken();
String content = getContent(headers.get("content-length"));
setSocketTimeout(headers.get("keep-alive"));
if ("OPTIONS".equals(command)) {
sendOptions();
} else if (!headers.containsKey("authorization")) {
sendUnauthorized();
} else {
decodeCredentials(headers.get("authorization"));
// authenticate only once
if (session == null) {
// first check network connectivity
ExchangeSessionFactory.checkConfig();
try {
session = ExchangeSessionFactory.getInstance(userName, password);
} catch (AuthenticationException e) {
sendErr(HttpStatus.SC_UNAUTHORIZED, e.getMessage());
}
}
handleRequest(command, path, headers, content);
}
} else {
sendErr(HttpStatus.SC_NOT_IMPLEMENTED, "Invalid URI");
}
}
os.flush();
}
} catch (SocketTimeoutException e) {
DavGatewayTray.debug("Closing connection on timeout");
} catch (SocketException e) {
DavGatewayTray.debug("Connection closed");
} catch (IOException e) {
DavGatewayTray.error(e);
try {
sendErr(HttpStatus.SC_INTERNAL_SERVER_ERROR, e);
} catch (IOException e2) {
DavGatewayTray.debug("Exception sending error to client", e2);
}
} finally {
close();
}
DavGatewayTray.resetIcon();
}
protected int getDepth(Map<String, String> headers) {
int result = 0;
String depthValue = headers.get("depth");
if (depthValue != null) {
try {
result = Integer.valueOf(depthValue);
} catch (NumberFormatException e) {
DavGatewayTray.warn("Invalid depth value: " + depthValue);
}
}
return result;
}
public void handleRequest(String command, String path, Map<String, String> headers, String body) throws IOException {
int depth = getDepth(headers);
if ("OPTIONS".equals(command)) {
sendOptions();
} else if ("PROPFIND".equals(command) && "/user/".equals(path)) {
CaldavRequest request = new CaldavRequest(body);
StringBuilder buffer = new StringBuilder();
buffer.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
buffer.append("<D:multistatus xmlns:D=\"DAV:\" xmlns:C=\"urn:ietf:params:xml:ns:caldav\">\n");
buffer.append(" <D:response>\n");
buffer.append(" <D:href>/user</D:href>\n");
buffer.append(" <D:propstat>\n");
buffer.append(" <D:prop>\n");
if (request.hasProperty("calendar-home-set")) {
buffer.append(" <C:calendar-home-set>\n");
buffer.append(" <D:href>/calendar</D:href>\n");
buffer.append(" </C:calendar-home-set>");
}
if (request.hasProperty("calendar-user-address-set")) {
buffer.append(" <C:calendar-user-address-set>\n");
buffer.append(" <D:href>mailto:").append(session.getEmail()).append("</D:href>\n");
buffer.append(" </C:calendar-user-address-set>");
}
if (request.hasProperty("schedule-inbox-URL")) {
buffer.append(" <C:schedule-inbox-URL>\n");
buffer.append(" <D:href>/inbox</D:href>\n");
buffer.append(" </C:schedule-inbox-URL>");
}
if (request.hasProperty("schedule-outbox-URL")) {
buffer.append(" <C:schedule-outbox-URL>\n");
buffer.append(" <D:href>/outbox</D:href>\n");
buffer.append(" </C:schedule-outbox-URL>");
}
buffer.append(" </D:prop>\n");
buffer.append(" <D:status>HTTP/1.1 200 OK</D:status>\n");
buffer.append(" </D:propstat>\n");
buffer.append(" </D:response>\n");
buffer.append("</D:multistatus>\n");
sendHttpResponse(HttpStatus.SC_MULTI_STATUS, null, "text/xml;charset=UTF-8", buffer.toString(), true);
} else if ("PROPFIND".equals(command) && "/calendar/".equals(path) && depth == 0 && body != null) {
CaldavRequest request = new CaldavRequest(body);
StringBuilder buffer = new StringBuilder();
buffer.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
buffer.append("<D:multistatus xmlns:D=\"DAV:\" xmlns:CS=\"http://calendarserver.org/ns/\">\n");
buffer.append(" <D:response>\n");
buffer.append(" <D:href>/calendar</D:href>\n");
buffer.append(" <D:propstat>\n");
buffer.append(" <D:prop>\n");
if (request.hasProperty("resourcetype")) {
buffer.append(" <D:resourcetype>\n");
buffer.append(" <D:collection/>\n");
buffer.append(" <C:calendar xmlns:C=\"urn:ietf:params:xml:ns:caldav\"/>\n");
buffer.append(" </D:resourcetype>\n");
}
if (request.hasProperty("owner")) {
buffer.append(" <D:owner>\n");
buffer.append(" <D:href>/user</D:href>\n");
buffer.append(" </D:owner>\n");
}
if (request.hasProperty("getctag")) {
buffer.append(" <CS:getctag>")
.append(base64Encode(session.getCalendarEtag()))
.append("</CS:getctag>\n");
}
buffer.append(" </D:prop>\n");
buffer.append(" <D:status>HTTP/1.1 200 OK</D:status>\n");
buffer.append(" </D:propstat>\n");
buffer.append(" </D:response>\n");
buffer.append("</D:multistatus>\n");
HashMap<String, String> responseHeaders = new HashMap<String, String>();
sendHttpResponse(HttpStatus.SC_MULTI_STATUS, responseHeaders, "text/xml;charset=UTF-8", buffer.toString(), true);
} else if ("REPORT".equals(command) && "/calendar/".equals(path) && depth == 1 && body != null) {
CaldavRequest request = new CaldavRequest(body);
List<ExchangeSession.Event> events;
List<String> notFound = new ArrayList<String>();
if (request.isMultiGet()) {
events = new ArrayList<ExchangeSession.Event>();
for (String href : request.getHrefs()) {
try {
events.add(session.getEvent(href.substring("/calendar/".length())));
} catch (HttpException e) {
notFound.add(href);
}
}
} else {
events = session.getAllEvents();
}
StringBuilder buffer = new StringBuilder();
buffer.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
"<D:multistatus xmlns:D=\"DAV:\">\n");
for (ExchangeSession.Event event : events) {
String eventPath = event.getPath().replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(">", "&gt;");
buffer.append("<D:response>\n");
buffer.append(" <D:href>/calendar").append(eventPath).append("</D:href>\n");
buffer.append(" <D:propstat>\n");
buffer.append(" <D:prop>\n");
if (request.hasProperty("calendar-data")) {
String ics = event.getICS();
if (ics != null && ics.length() > 0) {
ics = ics.replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(">", "&gt;");
buffer.append(" <C:calendar-data xmlns:C=\"urn:ietf:params:xml:ns:caldav\"\n");
buffer.append(" C:content-type=\"text/calendar\" C:version=\"2.0\">");
buffer.append(ics);
buffer.append("</C:calendar-data>\n");
}
}
if (request.hasProperty("getetag")) {
buffer.append(" <D:getetag>").append(event.getEtag()).append("</D:getetag>\n");
}
buffer.append(" </D:prop>\n");
buffer.append(" <D:status>HTTP/1.1 200 OK</D:status>\n");
buffer.append(" </D:propstat>\n");
buffer.append(" </D:response>\n");
}
// send not found events errors
for (String href : notFound) {
buffer.append("<D:response>\n");
buffer.append(" <D:href>").append(href).append("</D:href>\n");
buffer.append(" <D:propstat>\n");
buffer.append(" <D:status>HTTP/1.1 404 Not Found</D:status>\n");
buffer.append(" </D:propstat>\n");
buffer.append(" </D:response>\n");
}
buffer.append("</D:multistatus>");
sendHttpResponse(HttpStatus.SC_MULTI_STATUS, null, "text/xml;charset=UTF-8", buffer.toString(), true);
} else if ("PUT".equals(command) && path.startsWith("/calendar/")) {
String etag = headers.get("if-match");
int status = session.createOrUpdateEvent(path.substring("/calendar/".length()), body, etag);
sendHttpResponse(status, true);
} else if ("POST".equals(command) && path.startsWith("/outbox")) {
Map<String, String> valueMap = new HashMap<String, String>();
Map<String, String> keyMap = new HashMap<String, String>();
BufferedReader reader = new BufferedReader(new StringReader(body));
String line;
String key = null;
while ((line = reader.readLine()) != null) {
if (line.startsWith(" ") && "ATTENDEE".equals(key)) {
valueMap.put(key, valueMap.get(key) + line.substring(1));
} else {
int index = line.indexOf(':');
if (index <= 0) {
throw new IOException("Invalid request: " + body);
}
String fullkey = line.substring(0, index);
String value = line.substring(index + 1);
int semicolonIndex = fullkey.indexOf(";");
if (semicolonIndex > 0) {
key = fullkey.substring(0, semicolonIndex);
} else {
key = fullkey;
}
valueMap.put(key, value);
keyMap.put(key, fullkey);
}
}
String response = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
" <C:schedule-response xmlns:D=\"DAV:\"\n" +
" xmlns:C=\"urn:ietf:params:xml:ns:caldav\">\n" +
" <C:response>\n" +
" <C:recipient>\n" +
" <D:href>" + valueMap.get("ATTENDEE") + "</D:href>\n" +
" </C:recipient>\n" +
" <C:request-status>2.0;Success</C:request-status>\n" +
" <C:calendar-data>BEGIN:VCALENDAR\n" +
"VERSION:2.0\n" +
"PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN\n" +
"METHOD:REPLY\n" +
"BEGIN:VFREEBUSY\n" +
"DTSTAMP:" + valueMap.get("DTSTAMP") + "\n" +
"ORGANIZER:" + valueMap.get("ORGANIZER") + "\n" +
"DTSTART:" + valueMap.get("DTSTART") + "\n" +
"DTEND:" + valueMap.get("DTEND") + "\n" +
"UID:" + valueMap.get("UID") + "\n" +
keyMap.get("ATTENDEE") + ";" + valueMap.get("ATTENDEE") + "\n" +
"FREEBUSY;FBTYPE=BUSY-UNAVAILABLE:" + session.getFreebusy(valueMap) + "\n" +
"END:VFREEBUSY\n" +
"END:VCALENDAR" +
"</C:calendar-data>\n" +
" </C:response>\n" +
" </C:schedule-response>";
sendHttpResponse(HttpStatus.SC_OK, null, "text/xml;charset=UTF-8", response, true);
} else if ("DELETE".equals(command) && path.startsWith("/calendar/")) {
int status = session.deleteEvent(path.substring("/calendar/".length()));
sendHttpResponse(status, true);
} else {
DavGatewayTray.error("Unsupported command: " + command + " " + path + "\n" + body);
sendErr(HttpStatus.SC_BAD_REQUEST, "Unsupported command: " + command);
}
}
public void sendErr(int status, Exception e) throws IOException {
String message = e.getMessage();
if (message == null) {
message = e.toString();
}
sendErr(status, message);
}
public void sendErr(int status, String message) throws IOException {
sendHttpResponse(status, null, "text/plain;charset=UTF-8", message, false);
}
public void sendOptions() throws IOException {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Allow", "OPTIONS, GET, PROPFIND, PUT, POST");
headers.put("DAV", "1, 2, 3, access-control, calendar-access, ticket, calendar-schedule");
sendHttpResponse(HttpStatus.SC_OK, headers, null, null, true);
}
public void sendUnauthorized() throws IOException {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("WWW-Authenticate", "Basic realm=\"" + Settings.getProperty("davmail.url") + "\"");
sendHttpResponse(HttpStatus.SC_UNAUTHORIZED, headers, null, null, true);
}
public void sendHttpResponse(int status, boolean keepAlive) throws IOException {
sendHttpResponse(status, null, null, null, keepAlive);
}
public void sendHttpResponse(int status, Map<String, String> headers, String contentType, String content, boolean keepAlive) throws IOException {
sendClient("HTTP/1.1 " + status + " " + HttpStatus.getStatusText(status));
sendClient("Server: DavMail Gateway");
SimpleDateFormat formatter = new java.text.SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.ENGLISH);
sendClient("Date: " + formatter.format(new java.util.Date()));
if (headers != null) {
for (Map.Entry<String, String> header : headers.entrySet()) {
sendClient(header.getKey() + ": " + header.getValue());
}
}
if (contentType != null) {
sendClient("Content-Type: " + contentType);
}
sendClient("Connection: " + (keepAlive ? "keep-alive" : "close"));
closed = !keepAlive;
if (content != null && content.length() > 0) {
sendClient("Content-Length: " + content.getBytes("UTF-8").length);
} else {
sendClient("Content-Length: 0");
}
sendClient("");
if (content != null && content.length() > 0) {
sendClient(content.getBytes("UTF-8"));
}
}
/**
* Decode HTTP credentials
*
* @param authorization http authorization header value
* @throws java.io.IOException if invalid credentials
*/
protected void decodeCredentials(String authorization) throws IOException {
int index = authorization.indexOf(' ');
if (index > 0) {
String mode = authorization.substring(0, index).toLowerCase();
if (!"basic".equals(mode)) {
throw new IOException("Unsupported authorization mode: " + mode);
}
String encodedCredentials = authorization.substring(index + 1);
String decodedCredentials = base64Decode(encodedCredentials);
index = decodedCredentials.indexOf(':');
if (index > 0) {
userName = decodedCredentials.substring(0, index);
password = decodedCredentials.substring(index + 1);
} else {
throw new IOException("Invalid credentials");
}
} else {
throw new IOException("Invalid credentials");
}
}
protected class CaldavRequest {
protected HashSet<String> properties = new HashSet<String>();
protected HashSet<String> hrefs;
protected boolean isMultiGet;
public CaldavRequest(String body) throws IOException {
// parse body
XMLStreamReader streamReader = null;
try {
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
inputFactory.setProperty(XMLInputFactory.IS_COALESCING, Boolean.TRUE);
inputFactory.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES, Boolean.TRUE);
streamReader = inputFactory.createXMLStreamReader(new StringReader(body));
boolean inElement = false;
boolean inProperties = false;
String currentElement = null;
while (streamReader.hasNext()) {
int event = streamReader.next();
if (event == XMLStreamConstants.START_ELEMENT) {
inElement = true;
currentElement = streamReader.getLocalName();
if ("prop".equals(currentElement)) {
inProperties = true;
} else if ("calendar-multiget".equals(currentElement)) {
isMultiGet = true;
} else if (inProperties) {
properties.add(currentElement);
}
} else if (event == XMLStreamConstants.END_ELEMENT) {
if ("prop".equals(currentElement)) {
inProperties = false;
}
} else if (event == XMLStreamConstants.CHARACTERS && inElement) {
if ("href".equals(currentElement)) {
if (hrefs == null) {
hrefs = new HashSet<String>();
}
hrefs.add(streamReader.getText());
}
inElement = false;
}
}
} catch (XMLStreamException e) {
throw new IOException(e.getMessage());
} finally {
try {
if (streamReader != null) {
streamReader.close();
}
} catch (XMLStreamException e) {
DavGatewayTray.error(e);
}
}
}
public boolean hasProperty(String propertyName) {
return properties.contains(propertyName);
}
public boolean isMultiGet() {
return isMultiGet && hrefs != null;
}
public Set<String> getHrefs() {
return hrefs;
}
}
}
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