This resulted in me creating a tiny grails application to synchronzie my deepbit statistics with the current market data from mtgox to calculate at which point it becomes pointless to mine these thing. I basically hope that this pays for the 700$ for my 2x6950 radeons and associated cooling the 100+F heat we have here in California.
Now originally you could assume that this is rather straightforward. After all you got json data, which just need to be parsed.
Map jsonArray = JSON.parse(new InputStreamReader(new URL("https://mtgox.com/code/data/ticker.php").openStream()))
println jsonArray
but sadly the java ssl security manager does not agree here with us and tosses a fit..
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1649)
Now java is kinda smart, if want's to force you install a security certificate from the server you access and authorize yourself. But sometimes you don't want this. In this case it's overkill, since we are having a readonly transaction.
So what has to be done?
you need to create your own security manager implementation. Which basically is a 3 step procedure
- implement an interface
class TrustManager implements X509TrustManager {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return null;
}
public void checkClientTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
public void checkServerTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
}
- register the interface and update the context configuration
TrustManager[] trustAllCerts = new TrustManager[1]
trustAllCerts[0] = new TrustManager()
try {
SSLContext sc = SSLContext.getInstance("SSL");
sc.init(null, trustAllCerts, new java.security.SecureRandom());
HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (Exception e) {
}
- and continue like always with your json script
Map jsonArray = JSON.parse(new InputStreamReader(new URL("https://mtgox.com/code/data/ticker.php").openStream()))
{"ticker":{"high":15.4989,"low":13.31415,"avg":14.726503862,"vol":42862,"last":13.31415,"buy":13.331,"sell":13.35999}}
