DB: optionally parse ticket URLs

Co-Authored-By: Jannis R <mail@jannisr.de>

p/db/index.js

@@ -260,6 +260,55 @@ const formatRefreshJourneyReq = (ctx, refreshToken) => {
 	};
 };
 
+const parseShpCtx = (addDataTicketInfo) => {
+	try {
+		return JSON.parse(atob(addDataTicketInfo)).shpCtx;
+	} catch (e) {
+		// in case addDataTicketInfo is not a valid base64 string
+		return null;
+	}
+};
+
+
+const addDbOfferSelectionUrl = (journey, opt) => {
+
+	// if no ticket contains addData, we can't get the offer selection URL
+	if (journey.tickets.some((t) => t.addDataTicketInfo)) {
+
+		const queryParams = new URLSearchParams();
+
+		// Add individual parameters
+		queryParams.append('A.1', opt.age);
+		queryParams.append('E', 'F');
+		queryParams.append('E.1', opt.loyaltyCard ? formatLoyaltyCard(opt.loyaltyCard) : '0');
+		queryParams.append('K', opt.firstClass ? '1' : '2');
+		queryParams.append('M', 'D');
+		queryParams.append('RT.1', 'E');
+		queryParams.append('SS', journey.legs[0].origin.id);
+		queryParams.append('T', journey.legs[0].departure);
+		queryParams.append('VH', journey.refreshToken);
+		queryParams.append('ZS', journey.legs[journey.legs.length - 1].destination.id);
+		queryParams.append('journeyOptions', '0');
+		queryParams.append('journeyProducts', '1023');
+		queryParams.append('optimize', '1');
+		queryParams.append('returnurl', 'dbnavigator://');
+		const endpoint = opt.language === 'de' ? 'dox' : 'eox';
+
+		journey.tickets.forEach((t) => {
+			const shpCtx = parseShpCtx(t.addDataTicketInfo);
+			if (shpCtx) {
+				const url = new URL(`https://mobile.bahn.de/bin/mobil/query.exe/${endpoint}`);
+				url.searchParams = new URLSearchParams(queryParams);
+				url.searchParams.append('shpCtx', shpCtx);
+				t.url = url.href;
+			} else {
+				t.url = null;
+			}
+		});
+	}
+};
+
+
 // todo: fix this
 // line: {
 // 	type: 'line',
@@ -357,6 +406,10 @@ const mutateToAddTickets = (parsed, opt, j) => {
 				currency: 'EUR',
 			};
 		}
+		if (opt.generateUnreliableTicketUrls) {
+			addDbOfferSelectionUrl(parsed, opt);
+		}
+
 	}
 };
 
@@ -635,6 +688,7 @@ const profile = {
 
 	formatStation,
 
+	generateUnreliableTicketUrls: false,
 	refreshJourneyUseOutReconL: true,
 	trip: true,
 	journeysFromTrip: true,