680 lines
23 KiB
PHP
680 lines
23 KiB
PHP
<?php
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// =====================================================================
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// Contributions API Endpoint
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// Handles CRUD Operations for Contributions (Points, Lines, Polygons)
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// and Voting. Actions are determined by the 'action' Parameter in
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// the Request.
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//
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// Supported Actions:
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// read — Load approved Contributions
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// create — Insert Contributions
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// update — Update Contributions
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// delete — Delete Contributions
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// vote — Like or Dislike Contributions
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// =====================================================================
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require_once __DIR__ . '/db.php';
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// ---------------------------------------------------------------------
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// Read Action Parameter and Route to correct Handler
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// ---------------------------------------------------------------------
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$input = get_input();
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$action = $input['action'] ?? '';
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switch ($action) {
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case 'read':
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handle_read($input);
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break;
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case 'create':
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handle_create($input);
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break;
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case 'update':
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handle_update($input);
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break;
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case 'delete':
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handle_delete($input);
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break;
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case 'vote':
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handle_vote($input);
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break;
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case 'create_news':
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handle_create_news($input);
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break;
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case 'update_news':
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handle_update_news($input);
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break;
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case 'delete_news':
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handle_delete_news($input);
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break;
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case 'read_comments':
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handle_read_comments($input);
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break;
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case 'create_comment':
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handle_create_comment($input);
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break;
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case 'delete_comment':
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handle_delete_comment($input);
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break;
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default:
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error_response('Unknown Action. Supported Actions are read, create, update, delete, vote.');
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}
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// =====================================================================
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// Action Handlers for Contributions
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// =====================================================================
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// ---------------------------------------------------------------------
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// READ: Loads approved Contributions as GeoJSON FeatureCollection
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// Required: municipality_id
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// Optional: category
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// ---------------------------------------------------------------------
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function handle_read($input) {
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$pdo = get_db();
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// Validate Input
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$missing = validate_required($input, ['municipality_id']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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$municipality_id = $input['municipality_id'];
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// Builds SQL Query with Placeholders for prepared Statement
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$sql = "SELECT *, ST_AsGeoJSON(geom) AS geojson
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FROM contributions
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WHERE municipality_id = :mid";
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$params = [':mid' => $municipality_id];
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// Optional: Filters by Status (Default: only approved)
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$status = $input['status'] ?? 'approved';
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if ($status !== 'all') {
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$sql .= " AND status = :status";
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$params[':status'] = $status;
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}
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// Optional: Filters by Category
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if (!empty($input['category'])) {
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$sql .= " AND category = :cat";
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$params[':cat'] = $input['category'];
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}
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$sql .= " ORDER BY created_at DESC";
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try {
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// Prepared Statement to prevent SQL Injection
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$stmt = $pdo->prepare($sql);
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$stmt->execute($params);
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// Fetches Results as PHP-Array
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$rows = $stmt->fetchAll();
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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// Builds GeoJSON FeatureCollection
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$features = [];
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foreach ($rows as $row) {
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$geometry = json_decode($row['geojson']);
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// Removes raw Geometry Columns from Properties
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unset($row['geom']);
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unset($row['geojson']);
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$features[] = [
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'type' => 'Feature',
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'geometry' => $geometry,
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'properties' => $row
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];
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}
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$featureCollection = [
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'type' => 'FeatureCollection',
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'features' => $features
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];
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// Includes User's Votes for persistent Vote Display
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// Returns which Contributions the current Browser has voted on
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$browser_id = $input['browser_id'] ?? '';
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if ($browser_id !== '') {
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$stmt = $pdo->prepare("
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SELECT contribution_id, vote_type
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FROM votes
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WHERE browser_id = :bid
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");
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$stmt->execute([':bid' => $browser_id]);
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$user_votes = [];
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foreach ($stmt->fetchAll() as $v) {
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$user_votes[$v['contribution_id']] = $v['vote_type'];
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}
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$featureCollection['user_votes'] = $user_votes;
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}
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json_response($featureCollection);
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}
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// ---------------------------------------------------------------------
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// CREATE: Inserts new Contributions
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// Required: municipality_id, geom, geom_type, category, title, author_name
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// Optional: description
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// ---------------------------------------------------------------------
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// ---------------------------------------------------------------------
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// CREATE: Inserts new Contributions with optional Photo Upload
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// Required: municipality_id, geom, geom_type, category, title, author_name
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// Optional: description, browser_id, photo (File Upload)
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// ---------------------------------------------------------------------
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function handle_create($input) {
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$pdo = get_db();
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// Validates Input
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$missing = validate_required($input, [
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'municipality_id', 'geom', 'geom_type', 'category', 'title', 'author_name'
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]);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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// Validates Geometry Type
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$valid_geom_types = ['point', 'line', 'polygon'];
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if (!in_array($input['geom_type'], $valid_geom_types)) {
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error_response('Invalid Geometry Type. Must be: ' . implode(', ', $valid_geom_types));
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}
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// Validates GeoJSON
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$geojson = json_decode($input['geom']);
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if (!$geojson || !isset($geojson->type)) {
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error_response('Invalid GeoJSON in Geometry Field.');
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}
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// Handles Photo Upload
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$photo_path = null;
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if (isset($_FILES['photo']) && $_FILES['photo']['error'] === UPLOAD_ERR_OK) {
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$photo_path = handle_photo_upload($_FILES['photo']);
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if (!$photo_path) {
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error_response('Photo Upload failed. JPG, PNG, GIF and WebP up to 5 MB are allowed.');
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}
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}
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// Prepared SQL Statement
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try {
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$stmt = $pdo->prepare("
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INSERT INTO contributions
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(municipality_id, geom, geom_type, category, title, description, author_name, browser_id, photo_path)
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VALUES
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(:mid, ST_SetSRID(ST_GeomFromGeoJSON(:geom), 4326), :geom_type,
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:category, :title, :description, :author_name, :browser_id, :photo_path)
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");
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$stmt->execute([
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':mid' => $input['municipality_id'],
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':geom' => $input['geom'],
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':geom_type' => $input['geom_type'],
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':category' => $input['category'],
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':title' => $input['title'],
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':description' => $input['description'] ?? '',
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':author_name' => $input['author_name'],
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':browser_id' => $input['browser_id'] ?? null,
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':photo_path' => $photo_path
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]);
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json_response([
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'message' => 'Contribution created successfully.',
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'contribution_id' => (int) $pdo->lastInsertId()
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], 201);
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// ---------------------------------------------------------------------
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// UPDATE: Updates existing Contributions
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// Required: contribution_id
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// Optional: category, title, description, status
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// Provided Fields are updated. Others remain unchanged.
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// ---------------------------------------------------------------------
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function handle_update($input) {
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$pdo = get_db();
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// Validates Input
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$missing = validate_required($input, ['contribution_id']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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$contribution_id = $input['contribution_id'];
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// Checks if Contribution exists
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$stmt = $pdo->prepare("SELECT contribution_id FROM contributions WHERE contribution_id = :id");
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$stmt->execute([':id' => $contribution_id]);
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if (!$stmt->fetch()) {
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error_response('Contribution not found.', 404);
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}
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// Builds dynamic SQL Query to only update sent Fields
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$updatable_fields = ['category', 'title', 'description', 'status', 'address'];
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$set_clauses = [];
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$params = [':id' => $contribution_id];
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foreach ($updatable_fields as $field) {
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if (isset($input[$field]) && $input[$field] !== '') {
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$set_clauses[] = "$field = :$field";
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$params[":$field"] = $input[$field];
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}
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}
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if (empty($set_clauses)) {
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error_response('No Fields to update. Provide at least one of: ' . implode(', ', $updatable_fields));
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}
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// Validates Status
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if (isset($params[':status'])) {
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$valid_statuses = ['pending', 'approved', 'rejected', 'in_progress', 'done'];
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if (!in_array($params[':status'], $valid_statuses)) {
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error_response('Invalid Status. Must be: ' . implode(', ', $valid_statuses));
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}
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}
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// Builds SQL Statement
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$sql = "UPDATE contributions SET " . implode(', ', $set_clauses) . " WHERE contribution_id = :id";
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// Prepared SQL Statement
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try {
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$stmt = $pdo->prepare($sql);
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$stmt->execute($params);
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json_response(['message' => 'Contribution updated successfully.']);
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// ---------------------------------------------------------------------
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// DELETE: Deletes existing Contributions
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// Required: contribution_id
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// Associated Votes are deleted automatically
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// ---------------------------------------------------------------------
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function handle_delete($input) {
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$pdo = get_db();
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// Validates Input
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$missing = validate_required($input, ['contribution_id']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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$contribution_id = $input['contribution_id'];
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// Checks if Contribution exists
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$stmt = $pdo->prepare("SELECT contribution_id FROM contributions WHERE contribution_id = :id");
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$stmt->execute([':id' => $contribution_id]);
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if (!$stmt->fetch()) {
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error_response('Contribution not found.', 404);
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}
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// Prepared SQL Statement
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try {
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$stmt = $pdo->prepare("DELETE FROM contributions WHERE contribution_id = :id");
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$stmt->execute([':id' => $contribution_id]);
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json_response(['message' => 'Contribution deleted successfully.']);
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// ---------------------------------------------------------------------
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// VOTE: Likes or Dislikes a Contribution
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// Required: contribution_id, voter_name, vote_type
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// Database Trigger automatically updates Likes and Dislikes Count
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// UNIQUE Constraint prevents duplicate Votes per Voter.
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// ---------------------------------------------------------------------
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function handle_vote($input) {
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$pdo = get_db();
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// Validates Input
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$missing = validate_required($input, ['contribution_id', 'voter_name', 'vote_type']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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// Validates Vote Type
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$valid_vote_types = ['like', 'dislike'];
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if (!in_array($input['vote_type'], $valid_vote_types)) {
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error_response('Invalid vote_type. Must be: ' . implode(', ', $valid_vote_types));
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}
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// Checks if Contribution exists
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$stmt = $pdo->prepare("SELECT contribution_id FROM contributions WHERE contribution_id = :id");
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$stmt->execute([':id' => $input['contribution_id']]);
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if (!$stmt->fetch()) {
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error_response('Contribution not found.', 404);
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}
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// Prepared SQL Statement
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try {
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// Checks if Voter already voted on this Contribution
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$browser_id = $input['browser_id'] ?? '';
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if (empty($browser_id)) {
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error_response('Browser ID required for Voting.');
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}
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$stmt = $pdo->prepare("
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SELECT vote_id, vote_type FROM votes
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WHERE contribution_id = :cid AND browser_id = :bid
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");
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$stmt->execute([':cid' => $input['contribution_id'], ':bid' => $browser_id]);
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$existing = $stmt->fetch();
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if ($existing) {
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if ($existing['vote_type'] === $input['vote_type']) {
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// Same Vote Type — Removes Vote
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$stmt = $pdo->prepare("DELETE FROM votes WHERE vote_id = :vid");
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$stmt->execute([':vid' => $existing['vote_id']]);
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json_response(['message' => 'Vote removed.', 'action' => 'removed']);
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} else {
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// Different Vote Type — Switches Vote
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$stmt = $pdo->prepare("DELETE FROM votes WHERE vote_id = :vid");
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$stmt->execute([':vid' => $existing['vote_id']]);
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$stmt = $pdo->prepare("
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INSERT INTO votes (contribution_id, voter_name, vote_type, browser_id)
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VALUES (:cid, :voter, :vtype, :bid)
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");
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$stmt->execute([
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':cid' => $input['contribution_id'],
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':voter' => $input['voter_name'],
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':vtype' => $input['vote_type'],
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':bid' => $browser_id
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]);
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json_response(['message' => 'Vote changed.', 'action' => 'changed'], 200);
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}
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} else {
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// No existing Vote — Inserts Vote
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$stmt = $pdo->prepare("
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INSERT INTO votes (contribution_id, voter_name, vote_type, browser_id)
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VALUES (:cid, :voter, :vtype, :bid)
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");
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$stmt->execute([
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':cid' => $input['contribution_id'],
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':voter' => $input['voter_name'],
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':vtype' => $input['vote_type'],
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':bid' => $browser_id
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]);
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json_response(['message' => 'Vote recorded.', 'action' => 'created'], 201);
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}
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// =====================================================================
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// Action Handlers for News
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// =====================================================================
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// ---------------------------------------------------------------------
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// CREATE NEWS: Inserts new News Entry
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// Required: municipality_id, title, content
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// ---------------------------------------------------------------------
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function handle_create_news($input) {
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$pdo = get_db();
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$missing = validate_required($input, ['municipality_id', 'title', 'content']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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try {
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$stmt = $pdo->prepare("
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INSERT INTO news (municipality_id, title, content, author_name)
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VALUES (:mid, :title, :content, :author)
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");
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$stmt->execute([
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':mid' => $input['municipality_id'],
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':title' => $input['title'],
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':content' => $input['content'],
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':author' => $input['author_name'] ?? 'Stadtverwaltung'
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]);
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json_response(['message' => 'News created successfully.', 'news_id' => (int) $pdo->lastInsertId()], 201);
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// ---------------------------------------------------------------------
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// UPDATE NEWS: Updates existing News Entry
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// Required: news_id
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// Optional: title, content
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// ---------------------------------------------------------------------
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function handle_update_news($input) {
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$pdo = get_db();
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$missing = validate_required($input, ['news_id']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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$set = [];
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$params = [':id' => $input['news_id']];
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foreach (['title', 'content', 'author_name'] as $field) {
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if (isset($input[$field]) && $input[$field] !== '') {
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$set[] = "$field = :$field";
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$params[":$field"] = $input[$field];
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}
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}
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if (empty($set)) {
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error_response('No Fields to update.');
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}
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try {
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$stmt = $pdo->prepare("UPDATE news SET " . implode(', ', $set) . " WHERE news_id = :id");
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$stmt->execute($params);
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json_response(['message' => 'News updated successfully.']);
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// ---------------------------------------------------------------------
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// DELETE NEWS: Deletes existing News Entry
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// Required: news_id
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// ---------------------------------------------------------------------
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function handle_delete_news($input) {
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$pdo = get_db();
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$missing = validate_required($input, ['news_id']);
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if (!empty($missing)) {
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error_response('Missing Fields: ' . implode(', ', $missing));
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}
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try {
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$stmt = $pdo->prepare("DELETE FROM news WHERE news_id = :id");
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$stmt->execute([':id' => $input['news_id']]);
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json_response(['message' => 'News deleted successfully.']);
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} catch (PDOException $e) {
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error_response('Database Error: ' . $e->getMessage(), 500);
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}
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}
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// =====================================================================
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// Action Handlers for Photos
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// =====================================================================
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// ---------------------------------------------------------------------
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// PHOTO UPLOAD: Validates and Saves uploaded Photo Files
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// Returns relative Path on Success, null on Failure.
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// Allowed: JPG, PNG, GIF, WebP. with maximum Size of 5 MB.
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// ---------------------------------------------------------------------
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function handle_photo_upload($file) {
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// Validates File Size
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$max_size = 5 * 1024 * 1024;
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if ($file['size'] > $max_size) {
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return null;
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}
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// Validates MIME Type
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$allowed_types = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'];
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$finfo = finfo_open(FILEINFO_MIME_TYPE);
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$mime = finfo_file($finfo, $file['tmp_name']);
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finfo_close($finfo);
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if (!in_array($mime, $allowed_types)) {
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return null;
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}
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|
|
// Generates unique Filename
|
|
$ext = [
|
|
'image/jpeg' => 'jpg',
|
|
'image/png' => 'png',
|
|
'image/gif' => 'gif',
|
|
'image/webp' => 'webp'
|
|
][$mime];
|
|
|
|
$filename = uniqid('photo_', true) . '.' . $ext;
|
|
$upload_dir = __DIR__ . '/../uploads/photos/';
|
|
$target_path = $upload_dir . $filename;
|
|
|
|
// Creates Upload Directory
|
|
if (!is_dir($upload_dir)) {
|
|
mkdir($upload_dir, 0755, true);
|
|
}
|
|
|
|
// Moves uploaded File
|
|
if (move_uploaded_file($file['tmp_name'], $target_path)) {
|
|
return 'uploads/photos/' . $filename;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
// =====================================================================
|
|
// Action Handlers for Comments
|
|
// =====================================================================
|
|
|
|
// ---------------------------------------------------------------------
|
|
// READ COMMENTS: Loads Comments for a Contribution
|
|
// Returns Comments sorted by Date (newest first)
|
|
// Required: contribution_id
|
|
// ---------------------------------------------------------------------
|
|
function handle_read_comments($input) {
|
|
$pdo = get_db();
|
|
|
|
$missing = validate_required($input, ['contribution_id']);
|
|
if (!empty($missing)) {
|
|
error_response('Missing Fields: ' . implode(', ', $missing));
|
|
}
|
|
|
|
try {
|
|
$stmt = $pdo->prepare("
|
|
SELECT comment_id, contribution_id, author_name, browser_id, content, created_at
|
|
FROM comments
|
|
WHERE contribution_id = :cid
|
|
ORDER BY created_at ASC
|
|
");
|
|
$stmt->execute([':cid' => $input['contribution_id']]);
|
|
$comments = $stmt->fetchAll();
|
|
|
|
json_response(['comments' => $comments, 'count' => count($comments)]);
|
|
|
|
} catch (PDOException $e) {
|
|
error_response('Database Error: ' . $e->getMessage(), 500);
|
|
}
|
|
}
|
|
|
|
|
|
// ---------------------------------------------------------------------
|
|
// CREATE COMMENT: Adds Comments to Contributions
|
|
// Required: contribution_id, author_name, content
|
|
// Optional: browser_id
|
|
// ---------------------------------------------------------------------
|
|
function handle_create_comment($input) {
|
|
$pdo = get_db();
|
|
|
|
$missing = validate_required($input, ['contribution_id', 'author_name', 'content']);
|
|
if (!empty($missing)) {
|
|
error_response('Missing Fields: ' . implode(', ', $missing));
|
|
}
|
|
|
|
// Validates Content Length
|
|
if (strlen($input['content']) > 1000) {
|
|
error_response('Comment too long. Maximum 1000 Characters.');
|
|
}
|
|
|
|
// Checks if Contribution exists
|
|
$stmt = $pdo->prepare("SELECT contribution_id FROM contributions WHERE contribution_id = :id");
|
|
$stmt->execute([':id' => $input['contribution_id']]);
|
|
if (!$stmt->fetch()) {
|
|
error_response('Contribution not found.', 404);
|
|
}
|
|
|
|
try {
|
|
$stmt = $pdo->prepare("
|
|
INSERT INTO comments (contribution_id, author_name, browser_id, content)
|
|
VALUES (:cid, :author, :bid, :content)
|
|
");
|
|
$stmt->execute([
|
|
':cid' => $input['contribution_id'],
|
|
':author' => $input['author_name'],
|
|
':bid' => $input['browser_id'] ?? null,
|
|
':content' => $input['content']
|
|
]);
|
|
|
|
$stmt2 = $pdo->prepare("
|
|
UPDATE contributions
|
|
SET comment_count = comment_count + 1
|
|
WHERE contribution_id = :cid;
|
|
");
|
|
|
|
$stmt2->execute([':cid' => $input['contribution_id']]);
|
|
|
|
json_response([
|
|
'message' => 'Comment created successfully.',
|
|
'comment_id' => (int) $pdo->lastInsertId()
|
|
], 201);
|
|
|
|
} catch (PDOException $e) {
|
|
error_response('Database Error: ' . $e->getMessage(), 500);
|
|
}
|
|
}
|
|
|
|
|
|
// ---------------------------------------------------------------------
|
|
// DELETE COMMENT: Removes a Comment
|
|
// Required: comment_id
|
|
// ---------------------------------------------------------------------
|
|
function handle_delete_comment($input) {
|
|
$pdo = get_db();
|
|
|
|
$missing = validate_required($input, ['comment_id']);
|
|
if (!empty($missing)) {
|
|
error_response('Missing Fields: ' . implode(', ', $missing));
|
|
}
|
|
|
|
try {
|
|
$stmt = $pdo->prepare("DELETE FROM comments WHERE comment_id = :id");
|
|
$stmt->execute([':id' => $input['comment_id']]);
|
|
|
|
$stmt2 = $pdo->prepare("
|
|
UPDATE contributions
|
|
SET comment_count = comment_count - 1
|
|
WHERE contribution_id = :cid;
|
|
");
|
|
|
|
$stmt2->execute([':cid' => $input['contribution_id']]);
|
|
|
|
json_response(['message' => 'Comment deleted successfully.']);
|
|
|
|
} catch (PDOException $e) {
|
|
error_response('Database Error: ' . $e->getMessage(), 500);
|
|
}
|
|
} |