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104if (_offer.creator == OfferCreator.Seller) {
105    if (_offer.buyerId != 0) revert InvalidBuyerOfferFields();
106
107    // Validate caller is seller assistant
108    if (_authenticate) {
109        (bool isAssistant, uint256 sellerId) = getSellerIdByAssistant(sender);
110        if (!isAssistant) {
111            revert NotAssistant();
112        }
113        _offer.sellerId = sellerId;
114    }
115} else if (_offer.creator == OfferCreator.Buyer) {

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50/**
51 * @notice Creates offer. Can be reused among different facets.
52 *
53 * Emits an OfferCreated event if successful.
54 *
55 * Reverts if:
56 * - Caller is not an assistant in case of seller-initiated offer
57 * - sellerId is not 0 when buyer-initiated offer is created
58 * - collectionIndex is not 0 when buyer-initiated offer is created
59 * - royaltyInfo is not empty when buyer-initiated offer is created
60 * - priceType is not Static when buyer-initiated offer is created
61 * - Invalid offer creator value specified (OfferCreator.Seller or OfferCreator.Buyer)
62 * - Valid from date is greater than valid until date
63 * - Valid until date is not in the future
64 * - Both voucher expiration date and voucher expiration period are defined
65 * - Neither of voucher expiration date and voucher expiration period are defined
66 * - Voucher redeemable period is fixed, but it ends before it starts
67 * - Voucher redeemable period is fixed, but it ends before offer expires
68 * - Dispute period is less than minimum dispute period
69 * - Resolution period is not between the minimum and the maximum resolution period
70 * - Voided is set to true
71 * - Available quantity is set to zero
72 * - Dispute resolver wallet is not registered, except for absolute zero offers with unspecified dispute resolver
73 * - Dispute resolver is not active, except for absolute zero offers with unspecified dispute resolver
74 * - Seller is not on dispute resolver's seller allow list
75 * - Dispute resolver does not accept fees in the exchange token
76 * - Buyer cancel penalty is greater than price
77 * - When agent id is non zero:
78 *   - If Agent does not exist
79 * - If the sum of agent fee amount and protocol fee amount is greater than the offer fee limit determined by the protocol
80 * - If the sum of agent fee amount and protocol fee amount is greater than fee limit set by seller
81 * - Royalty recipient is not on seller's allow list
82 * - Royalty percentage is less than the value decided by the admin
83 * - Total royalty percentage is more than max royalty percentage
84 *
85 * @param _offer - the fully populated struct with offer id set to 0x0 and voided set to false
86 * @param _offerDates - the fully populated offer dates struct
87 * @param _offerDurations - the fully populated offer durations struct
88 * @param _drParameters - the id of chosen dispute resolver (can be 0) and mutualizer address (0 for self-mutualization)
89 * @param _agentId - the id of agent
90 * @param _feeLimit - the maximum fee that seller is willing to pay per exchange (for static offers)
91 * @param _authenticate - whether to authenticate the caller. Use false when called from a handler that already authenticated the caller.
92 */
93function createOfferInternal(
94    Offer memory _offer,
95    OfferDates calldata _offerDates,
96    OfferDurations calldata _offerDurations,
97    BosonTypes.DRParameters calldata _drParameters,
98    uint256 _agentId,
99    uint256 _feeLimit,
100    bool _authenticate
101) internal returns (uint256 offerId) {
102    address sender = _msgSender();
103
104    if (_offer.creator == OfferCreator.Seller) {
105        if (_offer.buyerId != 0) revert InvalidBuyerOfferFields();
106
107        // Validate caller is seller assistant
108        if (_authenticate) {
109            (bool isAssistant, uint256 sellerId) = getSellerIdByAssistant(sender);
110            if (!isAssistant) {
111                revert NotAssistant();
112            }
113            _offer.sellerId = sellerId;
114        }
115    } else if (_offer.creator == OfferCreator.Buyer) {
116        if (
117            _offer.sellerId != 0 ||
118            _offer.collectionIndex != 0 ||
119            _offer.royaltyInfo.length != 1 ||
120            _offer.royaltyInfo[0].recipients.length != 0 ||
121            _offer.royaltyInfo[0].bps.length != 0 ||
122            _drParameters.mutualizerAddress != address(0) ||
123            _offer.quantityAvailable != 1 ||
124            _offer.priceType != PriceType.Static
125        ) {
126            revert InvalidBuyerOfferFields();
127        }
128        if (_authenticate) _offer.buyerId = getValidBuyer(payable(sender));
129    }