Hi all.
I am trying to download a file from an URL and need to set the proxy programatically. I read in Use Proxy Configuartion in custom node that the proxy settings are used automatically but failed to reproduce it. This is a five years old post so the code base may have changed.
For my test I added a download of the KNIME logo and debugged it.
private static boolean urlTest() {
try (InputStream stream = FileUtil.openStreamWithTimeout(
new URL("https://www.knime.com/themes/custom/bootstrap_knime/logo.svg"))) {
return true;
} catch (final Exception e) {
return false;
}
}
Here I am using FileUtil#openStreamWithTimeOut which produces a timeout exception behind a proxy. In the source code I did not find any proxy configuration.
public static InputStream openStreamWithTimeout(final URL url, final int timeout)
throws IOException {
URLConnection conn = url.openConnection();
conn.setConnectTimeout(timeout);
conn.setReadTimeout(timeout);
return conn.getInputStream();
}
To actually make it work I needed to set the proxy manually in my client code.
// TODO: From KNIME FileUtil. To be deleted.
public static InputStream openStream(final URL url) throws IOException {
final Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(some_host, some_port));
final URLConnection conn = url.openConnection(proxy);
conn.setConnectTimeout(1000);
conn.setReadTimeout(1000);
return conn.getInputStream();
}
This is far from desirable. I should set the proxy for every client with one. Then I tried to retrieve the proxy configuration from the Eclipse configuration in Network connections from eclipse.core.ui.net. Here I am taking the proxies entered by the user in that dialog.
final IProxyService proxyService = ProxyManager.getProxyManager();
final IProxyData[] pd = proxyService.getProxyData();
if (proxyService.isProxiesEnabled()) {
final IProxyData httpProxy = proxyService.getProxyData(IProxyData.HTTP_PROXY_TYPE);
if (httpProxy != null) {
if (httpProxy.getHost() != null && httpProxy.getPort() != -1) {
System.setProperty("http.proxyHost", httpProxy.getHost());
System.setProperty("http.proxyPort", Integer.toString(httpProxy.getPort()));
}
}
final IProxyData httpsProxy = proxyService.getProxyData(IProxyData.HTTPS_PROXY_TYPE);
if (httpsProxy != null) {
if (httpsProxy.getHost() != null && httpsProxy.getPort() != -1) {
System.setProperty("https.proxyHost", httpsProxy.getHost());
System.setProperty("https.proxyPort", Integer.toString(httpsProxy.getPort()));
}
}
}
Unfortunately the proxy service is returning empty proxies unlike the ones in my KNIME workspace. I am debugging my RCP application against this KNIME workspace and when I start standalone KNIME all the proxies are there. Maybe I have to query the preference store instead.
Anyway, as you can see it is pretty troublesome to get this configuration and it would be a great help if you could point me to the KNIME API that downloads files with the user-given configuration or any tips with the Eclipse code I pasted.
Lots of thanks,
Miguel