private void validateCommands()

in org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java [1616:1751]
104 lines of code
31 McCabe index (conditional complexity)

	private void validateCommands() {
		for (ReceiveCommand cmd : commands) {
			final Ref ref = cmd.getRef();
			if (cmd.getResult() != Result.NOT_ATTEMPTED)
				continue;

			if (cmd.getType() == ReceiveCommand.Type.DELETE) {
				if (!isAllowDeletes()) {
					// Deletes are not supported on this repository.
					cmd.setResult(Result.REJECTED_NODELETE);
					continue;
				}
				if (!isAllowBranchDeletes()
						&& ref.getName().startsWith(Constants.R_HEADS)) {
					// Branches cannot be deleted, but other refs can.
					cmd.setResult(Result.REJECTED_NODELETE);
					continue;
				}
			}

			if (cmd.getType() == ReceiveCommand.Type.CREATE) {
				if (!isAllowCreates()) {
					cmd.setResult(Result.REJECTED_NOCREATE);
					continue;
				}

				if (ref != null && !isAllowNonFastForwards()) {
					// Creation over an existing ref is certainly not going
					// to be a fast-forward update. We can reject it early.
					//
					cmd.setResult(Result.REJECTED_NONFASTFORWARD);
					continue;
				}

				if (ref != null) {
					// A well behaved client shouldn't have sent us a
					// create command for a ref we advertised to it.
					//
					cmd.setResult(Result.REJECTED_OTHER_REASON,
							JGitText.get().refAlreadyExists);
					continue;
				}
			}

			if (cmd.getType() == ReceiveCommand.Type.DELETE && ref != null) {
				ObjectId id = ref.getObjectId();
				if (id == null) {
					id = ObjectId.zeroId();
				}
				if (!ObjectId.zeroId().equals(cmd.getOldId())
						&& !id.equals(cmd.getOldId())) {
					// Delete commands can be sent with the old id matching our
					// advertised value, *OR* with the old id being 0{40}. Any
					// other requested old id is invalid.
					//
					cmd.setResult(Result.REJECTED_OTHER_REASON,
							JGitText.get().invalidOldIdSent);
					continue;
				}
			}

			if (cmd.getType() == ReceiveCommand.Type.UPDATE) {
				if (ref == null) {
					// The ref must have been advertised in order to be updated.
					//
					cmd.setResult(Result.REJECTED_OTHER_REASON,
							JGitText.get().noSuchRef);
					continue;
				}
				ObjectId id = ref.getObjectId();
				if (id == null) {
					// We cannot update unborn branch
					cmd.setResult(Result.REJECTED_OTHER_REASON,
							JGitText.get().cannotUpdateUnbornBranch);
					continue;
				}

				if (!id.equals(cmd.getOldId())) {
					// A properly functioning client will send the same
					// object id we advertised.
					//
					cmd.setResult(Result.REJECTED_OTHER_REASON,
							JGitText.get().invalidOldIdSent);
					continue;
				}

				// Is this possibly a non-fast-forward style update?
				//
				RevObject oldObj, newObj;
				try {
					oldObj = walk.parseAny(cmd.getOldId());
				} catch (IOException e) {
					receiveCommandErrorHandler
							.handleOldIdValidationException(cmd, e);
					continue;
				}

				try {
					newObj = walk.parseAny(cmd.getNewId());
				} catch (IOException e) {
					receiveCommandErrorHandler
							.handleNewIdValidationException(cmd, e);
					continue;
				}

				if (oldObj instanceof RevCommit
						&& newObj instanceof RevCommit) {
					try {
						if (walk.isMergedInto((RevCommit) oldObj,
								(RevCommit) newObj)) {
							cmd.setTypeFastForwardUpdate();
						} else {
							cmd.setType(ReceiveCommand.Type.UPDATE_NONFASTFORWARD);
						}
					} catch (IOException e) {
						receiveCommandErrorHandler
								.handleFastForwardCheckException(cmd, e);
					}
				} else {
					cmd.setType(ReceiveCommand.Type.UPDATE_NONFASTFORWARD);
				}

				if (cmd.getType() == ReceiveCommand.Type.UPDATE_NONFASTFORWARD
						&& !isAllowNonFastForwards()) {
					cmd.setResult(Result.REJECTED_NONFASTFORWARD);
					continue;
				}
			}

			if (!cmd.getRefName().startsWith(Constants.R_REFS)
					|| !Repository.isValidRefName(cmd.getRefName())) {
				cmd.setResult(Result.REJECTED_OTHER_REASON,
						JGitText.get().funnyRefname);
			}
		}
	}