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Fixed Zoom SDK JWT-Token generation

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This commit is contained in:
anhefti 2021-10-25 13:31:05 +02:00
parent 5cf2547b86
commit b06e6d5424
2 changed files with 82 additions and 8 deletions
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5
src/main/java/ch/ethz/seb/sebserver/gbl/util/Utils.java
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@ -530,6 +530,10 @@ public final class Utils {
return getMillisecondsNow() / 1000;
}
public static long toSeconds(final long millis) {
return millis / 1000;
}
public static RGB toRGB(final String rgbString) {
if (StringUtils.isNotBlank(rgbString)) {
return new RGB(
@ -661,4 +665,5 @@ public final class Utils {
return false; // Either timeout or unreachable or failed DNS lookup.
}
}
}

85
src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/proctoring/ZoomProctoringService.java
View file

@ -56,6 +56,7 @@ import ch.ethz.seb.sebserver.gbl.api.JSONMapper;
import ch.ethz.seb.sebserver.gbl.async.AsyncService;
import ch.ethz.seb.sebserver.gbl.async.CircuitBreaker;
import ch.ethz.seb.sebserver.gbl.client.ClientCredentials;
import ch.ethz.seb.sebserver.gbl.model.exam.Exam;
import ch.ethz.seb.sebserver.gbl.model.exam.ProctoringRoomConnection;
import ch.ethz.seb.sebserver.gbl.model.exam.ProctoringServiceSettings;
import ch.ethz.seb.sebserver.gbl.model.exam.ProctoringServiceSettings.ProctoringServerType;
@ -92,6 +93,8 @@ public class ZoomProctoringService implements ExamProctoringService {
"{\"alg\":\"HS256\",\"typ\":\"JWT\"}";
private static final String ZOOM_API_ACCESS_TOKEN_PAYLOAD =
"{\"iss\":\"%s\",\"exp\":%s}";
private static final String ZOOM_SDK_ACCESS_TOKEN_PAYLOAD =
"{\"appKey\":\"%s\",\"iat\":%s,\"exp\":%s,\"tokenExp\":%s}";
private static final Map<String, String> SEB_API_NAME_INSTRUCTION_NAME_MAPPING = Utils.immutableMapOf(Arrays.asList(
new Tuple<>(
@ -260,7 +263,7 @@ public class ZoomProctoringService implements ExamProctoringService {
proctoringSettings.appSecret,
remoteProctoringRoom.joinKey);
final String jwt = this.createJWTForMeetingAccess(
final String jwt = this.createSignatureForMeetingAccess(
credentials,
String.valueOf(additionalZoomRoomData.meeting_id),
true);
@ -275,7 +278,7 @@ public class ZoomProctoringService implements ExamProctoringService {
sdkJWT = this.createJWTForSDKAccess(
sdkCredentials,
String.valueOf(additionalZoomRoomData.meeting_id));
forExam(proctoringSettings));
}
return new ProctoringRoomConnection(
@ -316,7 +319,7 @@ public class ZoomProctoringService implements ExamProctoringService {
proctoringSettings.appSecret,
remoteProctoringRoom.joinKey);
final String jwt = this.createJWTForMeetingAccess(
final String signature = this.createSignatureForMeetingAccess(
credentials,
String.valueOf(additionalZoomRoomData.meeting_id),
false);
@ -335,7 +338,7 @@ public class ZoomProctoringService implements ExamProctoringService {
sdkJWT = this.createJWTForSDKAccess(
sdkCredentials,
String.valueOf(additionalZoomRoomData.meeting_id));
forExam(proctoringSettings));
}
return new ProctoringRoomConnection(
@ -345,7 +348,7 @@ public class ZoomProctoringService implements ExamProctoringService {
additionalZoomRoomData.join_url,
roomName,
subject,
jwt,
signature,
sdkJWT,
credentials.accessToken,
credentials.clientId,
@ -646,12 +649,57 @@ public class ZoomProctoringService implements ExamProctoringService {
private String createJWTForSDKAccess(
final ClientCredentials sdkCredentials,
final String meetingId) {
final Long expTime) {
return createJWTForMeetingAccess(sdkCredentials, meetingId, false);
try {
final CharSequence decryptedSecret = this.cryptor
.decrypt(sdkCredentials.secret)
.getOrThrow();
final StringBuilder builder = new StringBuilder();
final Encoder urlEncoder = Base64.getUrlEncoder().withoutPadding();
final String jwtHeaderPart = urlEncoder
.encodeToString(ZOOM_ACCESS_TOKEN_HEADER.getBytes(StandardCharsets.UTF_8));
// epoch time in seconds
final long secondsNow = Utils.getSecondsNow();
final String jwtPayload = String.format(
ZOOM_SDK_ACCESS_TOKEN_PAYLOAD
.replaceAll(" ", "")
.replaceAll("\n", ""),
sdkCredentials.clientIdAsString(),
secondsNow,
expTime,
expTime);
final String jwtPayloadPart = urlEncoder
.encodeToString(jwtPayload.getBytes(StandardCharsets.UTF_8));
final String message = jwtHeaderPart + "." + jwtPayloadPart;
final Mac sha256_HMAC = Mac.getInstance(TOKEN_ENCODE_ALG);
final SecretKeySpec secret_key = new SecretKeySpec(
Utils.toByteArray(decryptedSecret),
TOKEN_ENCODE_ALG);
sha256_HMAC.init(secret_key);
final String hash = urlEncoder
.encodeToString(sha256_HMAC.doFinal(Utils.toByteArray(message)));
builder.append(message)
.append(".")
.append(hash);
return builder.toString();
} catch (final Exception e) {
throw new RuntimeException("Failed to create JWT for Zoom API access: ", e);
}
}
private String createJWTForMeetingAccess(
private String createSignatureForMeetingAccess(
final ClientCredentials credentials,
final String meetingId,
final boolean host) {
@ -683,6 +731,27 @@ public class ZoomProctoringService implements ExamProctoringService {
}
}
private long forExam(final ProctoringServiceSettings examProctoring) {
if (examProctoring.examId == null) {
throw new IllegalStateException("Missing exam identifier from ExamProctoring data");
}
long expTime = Utils.toSeconds(System.currentTimeMillis() + Constants.DAY_IN_MILLIS);
if (this.examSessionService.isExamRunning(examProctoring.examId)) {
final Exam exam = this.examSessionService.getRunningExam(examProctoring.examId)
.getOrThrow();
if (exam.endTime != null) {
expTime = Utils.toSeconds(exam.endTime.getMillis());
}
}
// refer to https://marketplace.zoom.us/docs/sdk/native-sdks/auth
// "exp": 0, //JWT expiration date (Min:1800 seconds greater than iat value, Max: 48 hours greater than iat value) in epoch format.
if (expTime - Utils.getSecondsNow() > Utils.toSeconds(2 * Constants.DAY_IN_MILLIS)) {
expTime = Utils.toSeconds(System.currentTimeMillis() + Constants.DAY_IN_MILLIS);
}
return expTime;
}
private final static class ZoomRestTemplate {
private static final int LIZENSED_USER = 2;