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www/index.php

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+<?php
+  require_once('../config.php');
+
+  $title = SITE_NAME;
+  $h1 = SITE_NAME;
+
+  function mkstring () {
+    $stringchars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
+    $newstring = '';
+
+    for ($i = 0; $i < 5; $i++) $newstring .= $stringchars[rand(0, strlen($stringchars))];
+    foreach ($arr as $k => $v) {
+      if ($newstring == $k) return mkstring();
+    }
+
+    return $newstring;
+  }
+
+  // パラメートルがなければ、スキップ。
+  if (isset($_POST['sosin'])) {
+    $newadd = $_POST['newadd'];
+    if (!str_starts_with($newadd, 'http://') && !str_starts_with($newadd, 'https://')) {
+      $title = '076エラー - 不正なURL';
+      $h1 = '【エラー】不正なURL';
+      $bg = 'daityan';
+      $bgpos = 'top right 100px';
+      $err = 'URLは「http://」又は「https://」で始まります。';
+      include_once('../views/404.php');
+      exit;
+    }
+
+    if (strlen($newadd) > 500) {
+      $title = '076エラー - 不正なURL';
+      $h1 = '【エラー】URLは長すぎ';
+      $bg = 'daityan';
+      $bgpos = 'top right 100px';
+      $err = 'URLは500文字以内です。';
+      include_once('../views/404.php');
+      exit;
+    }
+
+    $data = file_get_contents('links.json');
+
+    $arr = json_decode($data, true);
+    foreach ($arr as $k => $v) {
+      if ($newadd == $v) {
+        if (isset($_POST['api']) && $_POST['api'] == 1) {
+          header('Content-Type: application/json');
+          echo json_encode(['res' => $k]);
+        }
+        else header('Location: /?newurl='.$k);
+        exit;
+      }
+    }
+
+    $newstring = mkstring();
+
+    $arr[$newstring] = $newadd;
+    $newdata = json_encode($arr);
+    file_put_contents('links.json', $newdata);
+
+    if (isset($_POST['api']) && $_POST['api'] == 1) {
+      header('Content-Type: application/json');
+      echo json_encode(['res' => $newstring]);
+    }
+    else header('Location: /?newurl='.$newstring);
+    exit;
+  }
+  else if (!isset($_GET['url']) && isset($_GET['newurl'])) {
+    $newurl = $_GET['newurl'];
+    $bg = 'kasen';
+    $bgpos = 'top 10px left 120px';
+    include_once('../views/submitted.php');
+  }
+  else if (isset($_GET['url']) && $_GET['url'] != '') {
+    $data = file_get_contents('links.json');
+
+    foreach (json_decode($data) as $k => $v) {
+      // jsonファイルでキーを見つければ、転送されます。なければ、４０４エラーが出ます。
+      if ($_GET['url'] == $k) {
+        if (isset($_GET['api']) && $_GET['api'] == 1) {
+          header('Content-Type: application/json');
+          echo json_encode(['res' => $v]);
+        }
+        else header('Location: '.$v);
+        exit;
+      }
+      else {
+        $title = '076エラー - 未検出';
+        $h1 = '【４０４】未検出';
+        $bg = 'daityan';
+        $bgpos = 'top right 100px';
+        $err = 'このURLを見つけられませんでした。';
+        include_once('../views/404.php');
+      }
+    }
+  }
+  else if (!isset($_GET['url']) && $_SERVER['REQUEST_URI'] == '/') {
+    $bg = 'rumia';
+    $bgpos = 'top -30px right 90px';
+    include_once('../views/index.php');
+  }
+  else {
+    $title = '076エラー - 未検出';
+    $h1 = '【４０４】未検出';
+    $bg = 'daityan';
+    $bgpos = 'top right 100px';
+    $err = 'このURLを見つけられませんでした。';
+    include_once('../views/404.php');
+  }
+?>