implemented download of account data as CSV

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

accounting/src/main/java/de/srsoftware/umbrella/accounting/AccountingModule.java

@@ -78,7 +78,7 @@ public class AccountingModule extends BaseHandler implements AccountingService {
 				case null -> getAccounts(user.get(),ex);
 				default -> {
 					try {
-						yield getAccount(user.get(),Long.parseLong(head),ex);
+						yield getAccount(user.get(),Long.parseLong(head), path.pop(), ex);
 					} catch (NumberFormatException ignored) {}
 					yield super.doGet(path,ex);
 				}
@@ -184,9 +184,17 @@ public class AccountingModule extends BaseHandler implements AccountingService {
 		return null;
 	}
 
-	private boolean getAccount(UmbrellaUser user, long accountId, HttpExchange ex) throws IOException {
+	private boolean getAccount(UmbrellaUser user, long accountId, String format, HttpExchange ex) throws IOException {
 		if (!accountDb.getMembers(accountId).contains(user)) throw forbidden("You are not allowed to access account {id}",Field.ID,accountId);
-		return sendContent(ex, loadAccount(accountId));
+		var data = loadAccount(accountId);
+		return switch (format){
+			case "csv" -> {
+				ex.getResponseHeaders().add("Content-Type", "text/csv");
+				var users = userService().loader();
+				yield sendContent(ex,data.toCsv(users));
+			}
+			case null, default -> sendContent(ex,data);
+		};
 	}
 
 	private boolean getAccounts(UmbrellaUser user, HttpExchange ex) throws IOException {

core/src/main/java/de/srsoftware/umbrella/core/api/AccountingService.java

@@ -2,18 +2,18 @@
 package de.srsoftware.umbrella.core.api;
 
 import static de.srsoftware.umbrella.core.Util.mapValues;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import de.srsoftware.tools.Mappable;
 import de.srsoftware.umbrella.core.constants.Field;
 import de.srsoftware.umbrella.core.model.Account;
 import de.srsoftware.umbrella.core.model.Transaction;
+import de.srsoftware.umbrella.core.model.Translatable;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
-import java.util.HashMap;
+import java.util.*;
-import java.util.List;
-import java.util.Map;
 
 public interface AccountingService {
-	public record AccountData(Account account, List<Transaction> transactions, HashMap<Long, UmbrellaUser> userMap) implements Mappable {
+	record AccountData(Account account, List<Transaction> transactions, HashMap<Long, UmbrellaUser> userMap) implements Mappable {
 		public static AccountData of(Account account, List<Transaction> transactions, HashMap<Long, UmbrellaUser> userMap) {
 			return new AccountData(account, transactions, userMap);
 		}
@@ -26,6 +26,16 @@ public interface AccountingService {
 				Field.USER_LIST,mapValues(userMap)
 			);
 		}
+
+		public byte[] toCsv(Map<Long, UmbrellaUser> users) {
+			var keys = List.of(Field.DATE, Field.SOURCE, Field.AMOUNT, Field.DESTINATION, Field.PURPOSE,Field.TAGS);
+			var sb = new StringBuilder();
+			keys.stream().map(Translatable::t).forEach(field -> sb.append(field).append(";"));
+			transactions.stream().sorted(Comparator.comparing(Transaction::id))
+					.map(transaction -> transaction.csvLine(users, keys,";"))
+					.forEach(line -> sb.append("\n").append(line));
+			return sb.toString().getBytes(UTF_8);
+		}
 	}
 
 	AccountData loadAccount(long accountId);

core/src/main/java/de/srsoftware/umbrella/core/model/Transaction.java

@@ -9,9 +9,8 @@ import java.sql.SQLException;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.ZoneOffset;
-import java.util.HashSet;
+import java.util.*;
-import java.util.Map;
+import java.util.stream.Collectors;
-import java.util.Set;
 
 public class Transaction extends UmbrellaObject {
 	private final long accountId;
@@ -25,11 +24,11 @@ public class Transaction extends UmbrellaObject {
 	public Transaction(long id, long accountId, LocalDateTime date, IdOrString source, IdOrString destination, double amount, String purpose, Set<String> tags){
 		super(id);
 		this.accountId   = accountId;
-		this.date        = date;
-		this.source      = source;
-		this.destination = destination;
 		this.amount      = amount;
+		this.date        = date;
+		this.destination = destination;
 		this.purpose     = purpose;
+		this.source      = source;
 		this.tags        = tags == null ? new HashSet<>() : tags;
 	}
 
@@ -52,6 +51,10 @@ public class Transaction extends UmbrellaObject {
 		return this;
 	}
 
+	public String csvLine(Map<Long, UmbrellaUser> users, List<String> keys, String delimiter) {
+		return keys.stream().map(this::get).map(o -> resolveUsers(users,o)).map(o -> quote(o, delimiter)).collect(Collectors.joining(delimiter));
+	}
+
 	public LocalDateTime date(){
 		return date;
 	}
@@ -76,6 +79,19 @@ public class Transaction extends UmbrellaObject {
 		return this;
 	}
 
+	public Object get(String property){
+		return switch (property){
+			case Field.AMOUNT -> amount;
+			case Field.DATE -> date.toLocalDate();
+			case Field.DESTINATION -> destination;
+			case Field.ID -> id();
+			case Field.PURPOSE -> purpose;
+			case Field.SOURCE -> source;
+			case Field.TAGS -> tags.stream().sorted().collect(Collectors.joining(", "));
+			case null, default -> null;
+		};
+	}
+
 	public boolean isDirty(){
 		return !dirtyFields.isEmpty();
 	}
@@ -102,6 +118,18 @@ public class Transaction extends UmbrellaObject {
 		return this;
 	}
 
+	private static String quote(Object o, String delimiter){
+		var str = o == null ? "" : o instanceof Map<?,?> m ? m.get("value").toString() : o.toString();
+		if (str.contains(delimiter)) return '"'+str.replace("\"","\"\"")+'"';
+		return str;
+	}
+
+	private Object resolveUsers(Map<Long, UmbrellaUser> users, Object o) {
+		if (!(o instanceof IdOrString ios)) return o;
+		if (ios.isId()) return users.get(ios.id()) instanceof UmbrellaUser user ? user.name() : "unknown";
+		return ios;
+	}
+
 	public IdOrString source(){
 		return source;
 	}

frontend/src/routes/accounting/account.svelte

@@ -1,6 +1,6 @@
 <script>
 	import { onMount } from 'svelte';
-	import { api, eventStream, get } from '../../urls.svelte';
+	import { api, download, eventStream, get } from '../../urls.svelte';
 	import { error, yikes } from '../../warn.svelte';
 	import { t } from '../../translations.svelte';
 
@@ -16,6 +16,10 @@
 	let users        = {};
 	let sums         = $derived.by(calcSums);
 
+	function addToFilter(tag){
+		filter.push(tag.toLowerCase());
+	}
+
 	function calcSums(){
 		let sums = {};
 		sums[ 0] = 0;
@@ -32,10 +36,6 @@
 		return sums;
 	}
 
-	function addToFilter(tag){
-		filter.push(tag.toLowerCase());
-	}
-
 	function checker(taglist, filter){
 	    for (var f of filter){
 	        var included = false;
@@ -47,6 +47,10 @@
 		return true;
 	}
 
+	function csvexport(ev){
+		download(api(`accounting/${id}/csv`),account.name+".csv");
+	}
+
 	function dropTag(tag){
 		filter = filter.filter(x => x != tag.toLowerCase());
 	}
@@ -167,7 +171,9 @@
 					{t('external expenses')}<br/>
 					{t('sum external')}
 				</td>
-				<td colspan="2"></td>
+				<td colspan="2">
+					<button onclick={csvexport}>{t('export as {format}',{format:'CSV'})}</button>
+				</td>
 			</tr>
 		</tbody>
 	</table>

frontend/src/urls.svelte.js

@@ -8,6 +8,13 @@ export function get(url){
     return fetch(url,{ credentials:'include' });
 }
 
+export function download(url,name = null){
+    var link=document.createElement('a');
+    link.href = url;
+    link.download = name ? name : url.substr(url.lastIndexOf('/') + 1);
+    link.click();
+}
+
 export function drop(url, payload){
 	let data = {
 		credentials:'include',