154 lines
5.8 KiB
Java
154 lines
5.8 KiB
Java
package davmail.http;
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import davmail.Settings;
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import org.apache.commons.httpclient.Header;
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import org.apache.commons.httpclient.HttpClient;
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import org.apache.commons.httpclient.HttpException;
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import org.apache.commons.httpclient.HttpMethod;
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import org.apache.commons.httpclient.HttpStatus;
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import org.apache.commons.httpclient.NTCredentials;
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import org.apache.commons.httpclient.UsernamePasswordCredentials;
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import org.apache.commons.httpclient.methods.GetMethod;
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import java.io.IOException;
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/**
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* Create HttpClient instance according to DavGateway Settings
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*/
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public class DavGatewayHttpClientFacade {
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static {
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// force XML response with Internet Explorer header
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System.getProperties().setProperty("httpclient.useragent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)");
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}
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/**
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* Create a configured HttpClient instance.
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*
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* @return httpClient
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*/
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public static HttpClient getInstance() {
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// create an HttpClient instance
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HttpClient httpClient = new HttpClient();
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configureClient(httpClient);
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return httpClient;
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}
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/**
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* Update http client configuration (proxy)
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*
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* @param httpClient current Http client
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*/
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public static void configureClient(HttpClient httpClient) {
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// do not send basic auth automatically
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httpClient.getState().setAuthenticationPreemptive(false);
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boolean enableProxy = Settings.getBooleanProperty("davmail.enableProxy");
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String proxyHost = null;
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int proxyPort = 0;
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String proxyUser = null;
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String proxyPassword = null;
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if (enableProxy) {
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proxyHost = Settings.getProperty("davmail.proxyHost");
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proxyPort = Settings.getIntProperty("davmail.proxyPort");
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proxyUser = Settings.getProperty("davmail.proxyUser");
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proxyPassword = Settings.getProperty("davmail.proxyPassword");
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}
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// configure proxy
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if (proxyHost != null && proxyHost.length() > 0) {
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httpClient.getHostConfiguration().setProxy(proxyHost, proxyPort);
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if (proxyUser != null && proxyUser.length() > 0) {
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/* // Only available in newer HttpClient releases, not compatible with slide library
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List authPrefs = new ArrayList();
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authPrefs.add(AuthPolicy.BASIC);
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httpClient.getParams().setParameter(AuthPolicy.AUTH_SCHEME_PRIORITY,authPrefs);
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*/
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// instead detect ntlm authentication (windows domain name in user name)
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int backslashindex = proxyUser.indexOf("\\");
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if (backslashindex > 0) {
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httpClient.getState().setProxyCredentials(null, proxyHost,
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new NTCredentials(proxyUser.substring(backslashindex + 1),
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proxyPassword, null,
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proxyUser.substring(0, backslashindex)));
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} else {
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httpClient.getState().setProxyCredentials(null, proxyHost,
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new UsernamePasswordCredentials(proxyUser, proxyPassword));
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}
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}
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}
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}
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/**
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* Get Http Status code for the given URL
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*
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* @param url url string
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* @return HttpStatus code
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* @throws IOException on error
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*/
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public static int getHttpStatus(String url) throws IOException {
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int status = 0;
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HttpClient httpClient = DavGatewayHttpClientFacade.getInstance();
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HttpMethod testMethod = new GetMethod(url);
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testMethod.setDoAuthentication(false);
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try {
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status = httpClient.executeMethod(testMethod);
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} finally {
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testMethod.releaseConnection();
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}
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return status;
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}
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public static boolean isRedirect(int status) {
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return status == HttpStatus.SC_MOVED_PERMANENTLY
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|| status == HttpStatus.SC_MOVED_TEMPORARILY
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|| status == HttpStatus.SC_SEE_OTHER
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|| status == HttpStatus.SC_TEMPORARY_REDIRECT;
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}
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/**
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* Execute given url, manually follow redirects.
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* Workaround for HttpClient bug (GET full URL over HTTPS and proxy)
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*
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* @param httpClient HttpClient instance
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* @param url url string
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* @return executed method
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* @throws IOException on error
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*/
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public static HttpMethod executeFollowRedirects(HttpClient httpClient, String url) throws IOException {
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HttpMethod method = new GetMethod(url);
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method.setFollowRedirects(false);
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return executeFollowRedirects(httpClient, method);
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}
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public static HttpMethod executeFollowRedirects(HttpClient httpClient, HttpMethod method) throws IOException {
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try {
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httpClient.executeMethod(method);
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Header location = method.getResponseHeader("Location");
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int redirectCount = 0;
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while (redirectCount++ < 10
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&& location != null
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&& isRedirect(method.getStatusCode())) {
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method.releaseConnection();
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method = new GetMethod(method.getResponseHeader("Location").getValue());
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method.setFollowRedirects(false);
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httpClient.executeMethod(method);
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location = method.getResponseHeader("Location");
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}
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if (location != null && isRedirect(method.getStatusCode())) {
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method.releaseConnection();
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throw new HttpException("Maximum redirections reached");
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}
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} catch (IOException e) {
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method.releaseConnection();
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throw e;
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}
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// caller will need to release connection
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return method;
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}
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}
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