feat: token refresh every 12h

src/main/java/me/vinceh121/knb/Knb.java

@@ -77,7 +77,7 @@ public class Knb {
 	private final CommandListener regisListener;
 	private final Connection dbCon;
 	private final Table tableKdecoleInstances, tableSkolengoInstances;
-	private final JobDetail kdecoleJob, skolengoJob;
+	private final JobDetail kdecoleJob, skolengoJob, skolengoRefreshJob;
 	private final Map<String, AbstractCommand> cmdMap = new HashMap<>();
 	private final MetricRegistry metricRegistry = new MetricRegistry();
 	private final JedisPool redisPool;
@@ -155,6 +155,9 @@ public Knb() {
 				.ofType(SkolengoCheckingJob.class)
 				.withIdentity("skolengo-checker", "jobs")
 				.build();
+
+		this.skolengoRefreshJob
+				= JobBuilder.newJob().ofType(SkolengoRefreshJob.class).withIdentity("skolengo-refresh", "jobs").build();
 	}
 
 	private void start() {
@@ -179,9 +182,19 @@ private void start() {
 
 		this.skolengoJob.getJobDataMap().put("knb", this);
 
+		final Trigger skolengoRefreshTrig = TriggerBuilder.newTrigger()
+				.forJob(this.skolengoRefreshJob)
+				.startNow()
+				.withIdentity("skolengo-refresh-trig")
+				.withSchedule(SimpleScheduleBuilder.repeatHourlyForever(12))
+				.build();
+
+		this.skolengoRefreshJob.getJobDataMap().put("knb", this);
+
 		try {
 			this.scheduler.scheduleJob(this.kdecoleJob, kdecoleTrig);
 			this.scheduler.scheduleJob(this.skolengoJob, skolengoTrig);
+			this.scheduler.scheduleJob(this.skolengoRefreshJob, skolengoRefreshTrig);
 		} catch (final SchedulerException e) {
 			Knb.LOG.error("Could not schedule checking job", e);
 			System.exit(-5);

src/main/java/me/vinceh121/knb/SkolengoRefreshJob.java

@@ -0,0 +1,64 @@
+package me.vinceh121.knb;
+
+import java.io.IOException;
+import java.net.URI;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.quartz.Job;
+import org.quartz.JobExecutionContext;
+import org.quartz.JobExecutionException;
+
+import com.nimbusds.oauth2.sdk.ParseException;
+import com.nimbusds.oauth2.sdk.RefreshTokenGrant;
+import com.nimbusds.oauth2.sdk.Scope;
+import com.nimbusds.oauth2.sdk.TokenRequest;
+import com.nimbusds.oauth2.sdk.TokenResponse;
+import com.nimbusds.oauth2.sdk.id.ClientID;
+import com.nimbusds.oauth2.sdk.token.RefreshToken;
+import com.nimbusds.openid.connect.sdk.OIDCTokenResponse;
+import com.nimbusds.openid.connect.sdk.OIDCTokenResponseParser;
+import com.nimbusds.openid.connect.sdk.token.OIDCTokens;
+import com.rethinkdb.model.MapObject;
+
+import me.vinceh121.jskolengo.SkolengoConstants;
+
+public class SkolengoRefreshJob implements Job {
+	private static final Logger LOG = LogManager.getLogger(SkolengoRefreshJob.class);
+
+	@Override
+	public void execute(JobExecutionContext context) throws JobExecutionException {
+		final Knb knb = (Knb) context.getMergedJobDataMap().get("knb");
+
+		knb.getAllValidSkolengoInstances().forEach(ui -> {
+			try {
+				TokenRequest req = new TokenRequest(URI.create(ui.getTokenEndpoint()),
+						new ClientID(SkolengoConstants.OIDC_CLIENT_ID),
+						new RefreshTokenGrant(new RefreshToken(ui.getTokens().getRefreshToken())), new Scope("openid"),
+						null, null, null, null);
+
+				TokenResponse res = OIDCTokenResponseParser.parse(req.toHTTPRequest().send());
+
+				if (!res.indicatesSuccess()) {
+					throw new IOException("Refresh failed: " + res.toErrorResponse().toJSONObject());
+				}
+
+				OIDCTokenResponse tokensResponse = (OIDCTokenResponse) res.toSuccessResponse();
+				OIDCTokens tokens = tokensResponse.getOIDCTokens();
+
+				OIDCTokenSet tokenSet = new OIDCTokenSet();
+				tokenSet.setAccessToken(tokens.getAccessToken().toString());
+				tokenSet.setRefreshToken(tokens.getRefreshToken().toString());
+				tokenSet.setIdToken(tokens.getIDTokenString());
+
+				knb.getTableSkolengoInstances()
+						.get(ui.getId())
+						.update(new MapObject<>().with("tokens", tokenSet))
+						.run(knb.getDbCon());
+
+			} catch (ParseException | IOException e) {
+				LOG.error("Error while refreshing token", e);
+			}
+		});
+	}
+}

src/main/java/me/vinceh121/knb/SkolengoUserInstance.java

@@ -4,6 +4,7 @@ public class SkolengoUserInstance extends AbstractUserInstance {
 	private OIDCTokenSet tokens;
 	private String emsCode;
 	private String schoolId;
+	private String tokenEndpoint;
 
 	public OIDCTokenSet getTokens() {
 		return tokens;
@@ -29,6 +30,14 @@ public void setSchoolId(String schoolId) {
 		this.schoolId = schoolId;
 	}
 
+	public String getTokenEndpoint() {
+		return tokenEndpoint;
+	}
+
+	public void setTokenEndpoint(String tokenEndpoint) {
+		this.tokenEndpoint = tokenEndpoint;
+	}
+
 	@Override
 	public String toString() {
 		return "SkolengoUserInstance [tokens="