May 16 edits

_debug.php

@@ -0,0 +1,38 @@
+<?php
+
+defined('DEBUG') || define('DEBUG', $debug ?? $config['DEBUG'] ?? false);
+
+if (ob_get_level() === 0) {
+    ob_start();
+}
+
+function debug($msg) {
+   error_log($msg);
+   if (DEBUG > 1) print($msg . "\n");
+}
+register_shutdown_function(function () {
+    $error = error_get_last();
+
+    if ($error !== null) {
+        // Log fatal error details
+        $type = $error['type'];
+        $message = $error['message'];
+        $file = $error['file'];
+        $line = $error['line'];
+
+        echo "[SHUTDOWN] Fatal error: {$message} in {$file} on line {$line}\n";
+        // Optional: log to file
+        // file_put_contents('/path/to/shutdown.log', "[SHUTDOWN] ...\n", FILE_APPEND);
+    } else {
+        if (DEBUG > 1) {
+          DEBUG && header('Content-Type: text/plain');
+          # define('X','Well');
+          DEBUG && print("Constants\n".print_r((get_defined_constants(true))['user']??'No Constants', true) . "\n");
+          DEBUG && print("Functions\n".print_r((get_defined_functions(true))['user']??'No Functions', true) . "\n");
+          DEBUG && print("Variables\n".print_r(array_diff_key(get_defined_vars(), array_flip(['_SERVER','_GET','_POST','_COOKIE', '_FILES'])), true) . "\n");
+          DEBUG && print("Includes\n".print_r(get_included_files(), true) . "\n");
+        }
+        echo "[SHUTDOWN] Script completed normally.\n";
+    }
+});
+

index.php

@@ -0,0 +1,57 @@
+<?php
+
+$debug = 5;
+require '_debug.php';
+
+
+# Pattern begins '/' foloowed by 1 or more characters that are not '/' or '.'
+# In particular this blocks attempts to hack into system
+#
+# Example path '/article/market' will result in 'market' which we can try to 
+# match with 'market.php' or 'market.md'
+
+if (preg_match('#/([^/.]+)#',$_SERVER['PATH_INFO'], $m) === false) {
+  http_response_code('400');
+  echo "Request {$_SERVER['PATH_INFO']} malformed";
+  exit;
+}
+$page = $m[1];
+
+# Identify type of file as PHP or Markdown
+if (file_exists($page . '.php')) {
+  $file = $page . '.php';
+  $type = 'php';
+} else if (file_exists($page . '.md')) {
+  $file = $page . '.md';
+  $type = 'markdown';
+} else {
+  # Unknown or invalid path
+  http_response_code('404');
+  echo "File '$page' not found";
+  exit;
+}
+
+debug("PAGE: $page\n"
+     ."TYPE: $type\n"
+     ."PATH: {$_SERVER['PATH_INFO']}\n");
+
+# Load file, we do include rather than file_get_contents so PHP can be
+# executed if needed
+ob_start();
+include __DIR__ . '/' . $file;
+$contents = ob_get_clean();
+
+# Split off head matter
+#
+# this pattern uses the 'ms' modifier to treat multiline strings as a
+# single string, and let '\s', '.' etc treat newlines as whitespace
+# I match an _optional_ HTML ( '<!-- nnnn -->') comment if we want to wrap
+# the headmatter in a comment.
+#
+# The headmatter is delimited by either '----' or '++++' as per
+# Markdown/yaml standards.
+# Technical note that '+' is a regex character so \+{3,} instead of ++++
+if (preg_match('/^(<!--\s*)?(-{3,}|\+{3,})(.*)(-{3,}|\+{3,})(-->)?(.*)/ms',$contents, $parts) === true) {
+   $var_dump($parts);
+}
+