chore(download): Add support for segmented download

lib/orders/H004/serializers/download.js

@@ -13,7 +13,7 @@ module.exports = {
 			userId: client.userId,
 			hostId: client.hostId,
 		};
-		const { orderDetails, transactionId } = order;
+		const { orderDetails, transactionId, segmentNumber } = order;
 		const {
 			rootName, xmlOptions, xmlSchema, receipt, transfer, productString,
 		} = genericSerializer(client.hostId, transactionId);
@@ -25,35 +25,46 @@ module.exports = {
 		this.receipt = receipt;
 		this.transfer = transfer;
 
-		if (transactionId) return this.receipt();
+		if (!segmentNumber && transactionId) return this.receipt();
 
 		this.xmlSchema.header = {
 			'@': { authenticate: true },
 			static: {
 				HostID: ebicsAccount.hostId,
-				Nonce: Crypto.nonce(),
-				Timestamp: Crypto.timestamp(),
-				PartnerID: ebicsAccount.partnerId,
-				UserID: ebicsAccount.userId,
-				Product: {
-					'@': { Language: 'en' },
-					'#': productString,
-				},
-				OrderDetails: orderDetails,
-				BankPubKeyDigests: {
-					Authentication: {
-						'@': { Version: 'X002', Algorithm: 'http://www.w3.org/2001/04/xmlenc#sha256' },
-						'#': Crypto.digestPublicKey(keys.bankX()),
+				...!transactionId && {
+					Nonce: Crypto.nonce(),
+					Timestamp: Crypto.timestamp(),
+					PartnerID: ebicsAccount.partnerId,
+					UserID: ebicsAccount.userId,
+					Product: {
+						'@': { Language: 'en' },
+						'#': productString,
 					},
-					Encryption: {
-						'@': { Version: 'E002', Algorithm: 'http://www.w3.org/2001/04/xmlenc#sha256' },
-						'#': Crypto.digestPublicKey(keys.bankE()),
+					OrderDetails: orderDetails,
+					BankPubKeyDigests: {
+						Authentication: {
+							'@': { Version: 'X002', Algorithm: 'http://www.w3.org/2001/04/xmlenc#sha256' },
+							'#': Crypto.digestPublicKey(keys.bankX()),
+						},
+						Encryption: {
+							'@': { Version: 'E002', Algorithm: 'http://www.w3.org/2001/04/xmlenc#sha256' },
+							'#': Crypto.digestPublicKey(keys.bankE()),
+						},
 					},
+					SecurityMedium: '0000',
+				},
+				...transactionId && {
+					TransactionID: transactionId,
 				},
-				SecurityMedium: '0000',
 			},
 			mutable: {
-				TransactionPhase: 'Initialisation',
+				TransactionPhase: segmentNumber ? 'Transfer' : 'Initialisation',
+				...segmentNumber && {
+					SegmentNumber: {
+						'@': { lastSegment: false },
+						'#': segmentNumber,
+					},
+				},
 			},
 		};