From 1a00273578c43d3e97087c5247cdf82e1683d152 Mon Sep 17 00:00:00 2001
From: Eyre_S <sukazyo@outlook.com>
Date: Wed, 25 Jan 2023 13:48:03 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20site.robots=20=E5=8F=82?=
 =?UTF-8?q?=E6=95=B0=E6=94=AF=E6=8C=81=E4=BA=86=20robots.txt?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- 默认为 Allow All
---
 README.md             |  3 +--
 assets/robots.allow   |  2 ++
 assets/robots.deny    |  2 ++
 composer.json         |  2 +-
 index.php             | 19 +++++++++++++++++++
 src/Data/SiteMeta.php | 10 ++++++++++
 6 files changed, 35 insertions(+), 3 deletions(-)
 create mode 100644 assets/robots.allow
 create mode 100644 assets/robots.deny

diff --git a/README.md b/README.md
index 50da901..75be912 100644
--- a/README.md
+++ b/README.md
@@ -22,8 +22,7 @@
     - 启用模块 `rewrite`
       - 为网站根目录设置 `AllowOverride All`
   - 使用其它 Webserver，可以自行查询如何将 .htaccess 规则转换为你所使用的网站配置并写进你的网站配置当中
-- PHP 版本 8.0 以上
-  （旧版可能可以使用，但未经完全测试）
+- PHP 版本 8.1 以上
   - PHP 模块 `xml` (也可能叫做 `dom`)
   - PHP 模块 `mbstring`
   - PHP 模块 `fileinfo`
diff --git a/assets/robots.allow b/assets/robots.allow
new file mode 100644
index 0000000..e4b09c1
--- /dev/null
+++ b/assets/robots.allow
@@ -0,0 +1,2 @@
+User-agent: *
+Allow:/
diff --git a/assets/robots.deny b/assets/robots.deny
new file mode 100644
index 0000000..1f53798
--- /dev/null
+++ b/assets/robots.deny
@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /
diff --git a/composer.json b/composer.json
index b4427db..d3ea68d 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
 		}
 	},
 	"require": {
-		"php": ">=8.0",
+		"php": ">=8.1",
 		"ext-xml": "*",
 		"ext-dom": "*",
 		"ext-mbstring": "*",
diff --git a/index.php b/index.php
index 5abaa4f..c1f71d0 100644
--- a/index.php
+++ b/index.php
@@ -4,6 +4,7 @@ require "./constant.php";
 require "./vendor/autoload.php";
 
 use SukWs\Bookshelf\Data\PageMeta;
+use SukWs\Bookshelf\Data\SiteConfig\RobotsPolicy;
 use SukWs\Bookshelf\Data\SiteMeta;
 use SukWs\Bookshelf\Utils\PageParse;
 use SukWs\Bookshelf\Utils\RequestNotExistException;
@@ -18,6 +19,24 @@ try {
 		$tmp = substr($req, 0, -1);
 	$uri = explode("/", $req, 2);
 	
+	// 为 robots.txt 进行特别支持
+	if (sizeof($uri) == 1 && $uri[0] == "robots.txt") {
+		
+		$policy = SiteMeta::getRobotsPolicy();
+		
+		switch ($policy) {
+			case RobotsPolicy::allow:
+				exit(file_get_contents("./assets/robots.allow"));
+			case RobotsPolicy::deny:
+				exit(file_get_contents("./assets/robots.deny"));
+			case RobotsPolicy::file:
+				exit(file_get_contents("./data/robots.txt"));
+			case RobotsPolicy::raw:
+				exit(SiteMeta::getConfigurationLevelShelf("site.robots"));
+		}
+		
+	}
+	
 	try {
 		
 		// 寻找页面
diff --git a/src/Data/SiteMeta.php b/src/Data/SiteMeta.php
index a5425fd..dc5fa67 100644
--- a/src/Data/SiteMeta.php
+++ b/src/Data/SiteMeta.php
@@ -3,6 +3,7 @@
 namespace SukWs\Bookshelf\Data;
 
 use Exception;
+use SukWs\Bookshelf\Data\SiteConfig\RobotsPolicy;
 use SukWs\Bookshelf\Element\Bookshelf;
 
 class SiteMeta {
@@ -88,4 +89,13 @@ class SiteMeta {
 		return self::$BOOKSHELF->getConfiguration($key);
 	}
 	
+	public static function getRobotsPolicy (): RobotsPolicy {
+		return match (self::getConfigurationLevelShelf("site.robots")) {
+			"allow", null => RobotsPolicy::allow,
+			"deny" => RobotsPolicy::deny,
+			"custom", "file" => RobotsPolicy::file,
+			default => RobotsPolicy::raw,
+		};
+	}
+	
 }