Backend

Backend/campaigns.php

@@ -0,0 +1,70 @@
+<?php
+require "db.php";
+//Felix
+
+function user_id_from_username($u){
+  $st=db()->prepare("SELECT user_id FROM users WHERE username=?");
+  $st->execute([$u]);
+  $r=$st->fetch();
+  return $r ? (int)$r['user_id'] : 0;
+}
+
+$action = $_GET['action'] ?? '';
+
+if ($action==='get_for_owner') {
+  $uname = $_GET['owner_username'] ?? '';
+  if ($uname==='') bad('owner_username required');
+
+  $st = db()->prepare("SELECT c.campaign_id, c.title, c.description
+                         FROM campaigns c
+                         JOIN users u ON u.user_id=c.owner_user_id
+                        WHERE u.username=? LIMIT 1");
+  $st->execute([$uname]);
+  $row = $st->fetch();
+  if (!$row) bad('not_found',404);
+  ok($row);
+}
+
+if ($action==='ensure_for_owner') { 
+  $b = body(); $uname = $b['owner_username'] ?? '';
+  if ($uname==='') bad('owner_username required');
+  $uid = user_id_from_username($uname);
+  if ($uid<=0) bad('user_not_found',404);
+
+  $st = db()->prepare("SELECT campaign_id, title, description FROM campaigns WHERE owner_user_id=? LIMIT 1");
+  $st->execute([$uid]);
+  $row = $st->fetch();
+  if ($row) ok($row);
+
+  $ins = db()->prepare("INSERT INTO campaigns(owner_user_id,title,description) VALUES(?,?,?)");
+  $ins->execute([$uid,'Meine Kampagne',null]);
+  ok(['campaign_id'=>(int)db()->lastInsertId(),'title'=>'Meine Kampagne','description'=>null]);
+}
+
+if ($action==='update_for_owner') {
+  $b = body();
+  $uname = $b['owner_username'] ?? '';
+  $title = trim($b['title'] ?? '');
+  $desc  = $b['description'] ?? null;
+  if ($uname==='') bad('owner_username required');
+  if ($title==='') bad('title required');
+
+  $uid = user_id_from_username($uname);
+  if ($uid<=0) bad('user_not_found',404);
+
+  $st = db()->prepare("SELECT campaign_id FROM campaigns WHERE owner_user_id=? LIMIT 1");
+  $st->execute([$uid]);
+  $row = $st->fetch();
+
+  if ($row) {
+    $upd = db()->prepare("UPDATE campaigns SET title=?, description=? WHERE campaign_id=?");
+    $upd->execute([$title,$desc,(int)$row['campaign_id']]);
+    ok(['campaign_id'=>(int)$row['campaign_id']]);
+  } else {
+    $ins = db()->prepare("INSERT INTO campaigns(owner_user_id,title,description) VALUES(?,?,?)");
+    $ins->execute([$uid,$title,$desc]);
+    ok(['campaign_id'=>(int)db()->lastInsertId()]);
+  }
+}
+
+http_response_code(404); echo json_encode(['ok'=>false,'error'=>'unknown action']);