[server] Validate lecture/imageversion dates, conditionally set isTemplate

1 files changed, 67 insertions, 0 deletions

diff --git a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/util/Sanitizer.java b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/util/Sanitizer.java
new file mode 100644
index 00000000..5dd3b64e
--- /dev/null
+++ b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/util/Sanitizer.java
@@ -0,0 +1,67 @@
+package org.openslx.bwlp.sat.util;
+
+import org.openslx.bwlp.sat.RuntimeConfig;
+import org.openslx.bwlp.thrift.iface.DateParamError;
+import org.openslx.bwlp.thrift.iface.LectureWrite;
+import org.openslx.bwlp.thrift.iface.TInvalidDateParam;
+
+public class Sanitizer {
+
+	/**
+	 * One day in milliseconds
+	 */
+	private final static long ONE_DAY = 86400l * 1000l;
+
+	/**
+	 * How far in the past can a date lie? Currently 180 days, no idea if anyone
+	 * would ever need this feature, but don't error out right away
+	 */
+	private static final long LOWER_CUTOFF = 180l * ONE_DAY;
+
+	private static final long MAX_IMAGE_EXPIRY = 10l * 365l * ONE_DAY;
+
+	/**
+	 * Sanitize start and end date of lecture.
+	 * 
+	 * @param lecture Lecture to sanitize
+	 * @throws TInvalidDateParam If start or end date have invalid values
+	 */
+	public static void handleLectureDates(LectureWrite lecture) throws TInvalidDateParam {
+		if (lecture.startTime > lecture.endTime)
+			throw new TInvalidDateParam(DateParamError.NEGATIVE_RANGE, "Start date past end date");
+		final long now = System.currentTimeMillis();
+		long lowLimit = now - LOWER_CUTOFF;
+		if (lecture.startTime < lowLimit)
+			throw new TInvalidDateParam(DateParamError.TOO_LOW, "Start date lies in the past");
+		if (lecture.endTime < lowLimit)
+			throw new TInvalidDateParam(DateParamError.TOO_LOW, "End date lies in the past");
+		long highLimit = now + RuntimeConfig.getMaxLectureValidityMs();
+		if (lecture.startTime > highLimit)
+			throw new TInvalidDateParam(DateParamError.TOO_HIGH, "Start date lies too far in the future");
+		// Bonus: If the end date is just a little bit off, silently correct it, since it might be clock
+		// inaccuracies between server and client
+		if (lecture.endTime > highLimit) {
+			if (lecture.endTime - ONE_DAY > highLimit)
+				throw new TInvalidDateParam(DateParamError.TOO_HIGH, "End date lies too far in the future");
+			lecture.endTime = highLimit;
+		}
+	}
+
+	/**
+	 * Check if given image expiry date is valid. Be liberal here, since only
+	 * the super user can set it, and they should know what they're doing.
+	 * 
+	 * @param unixTimestamp timestamp to check
+	 * @throws TInvalidDateParam If the date is invalid
+	 */
+	public static void handleImageExpiryDate(long unixTimestamp) throws TInvalidDateParam {
+		final long now = System.currentTimeMillis();
+		long lowLimit = now - LOWER_CUTOFF;
+		if (unixTimestamp < lowLimit)
+			throw new TInvalidDateParam(DateParamError.TOO_LOW, "Expiry date lies in the past");
+		long highLimit = now + MAX_IMAGE_EXPIRY;
+		if (unixTimestamp > highLimit)
+			throw new TInvalidDateParam(DateParamError.TOO_HIGH, "Expiry date lies too far in the future");
+	}
+
+}