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guarded to /htdocs

/simon/data/evolution_api.php

<?php
declare(strict_types=1);
header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');
require_once __DIR__ . '/evolution_core.php';

try {
    $core = new SimonEvolutionCore(__DIR__);
    $action = (string)($_GET['action'] ?? $_POST['action'] ?? 'status');
    $raw = file_get_contents('php://input');
    $json = json_decode((string)$raw, true);
    $input = is_array($json) ? $json : $_POST;

$writeActions = ['start_cycle','create_candidate','run_test','run_shadow','start_canary','advance_canary','rollback','seed_demo'];
    if (in_array($action, $writeActions, true)) {
        if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') throw new RuntimeException('POST required.');
        $expected = getenv('SIMON_PHASE3_TOKEN') ?: '';
        if ($expected !== '') {
            $provided = (string)($_SERVER['HTTP_X_SIMON_TOKEN'] ?? $input['token'] ?? '');
            if (!hash_equals($expected, $provided)) {
                http_response_code(403);
                throw new RuntimeException('Invalid Phase 3 token.');
            }
        }
    }

$result = match ($action) {
        'status' => $core->status(),
        'start_cycle' => $core->startCycle($input),
        'create_candidate' => $core->createCandidate($input),
        'run_test' => $core->runTest($input),
        'run_shadow' => $core->runShadow($input),
        'start_canary' => $core->startCanary($input),
        'advance_canary' => $core->advanceCanary($input),
        'rollback' => $core->rollback($input),
        'seed_demo' => $core->seedDemo(),
        default => throw new InvalidArgumentException('Unknown action.'),
    };
    echo json_encode(['ok' => true, 'result' => $result], JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
} catch (Throwable $e) {
    if (http_response_code() < 400) http_response_code($e instanceof InvalidArgumentException ? 422 : 500);
    echo json_encode(['ok' => false, 'error' => $e->getMessage()], JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
}

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