From d4ae9588adc93dc3cbb256baf7a7c55e382b6285 Mon Sep 17 00:00:00 2001
From: hyphen-o <otekapu@gmail.com>
Date: Thu, 3 Oct 2024 11:39:38 +0900
Subject: [PATCH] =?UTF-8?q?=E3=82=A8=E3=83=A9=E3=83=BC=E3=83=8F=E3=83=B3?=
 =?UTF-8?q?=E3=83=89=E3=83=AA=E3=83=B3=E3=82=B0=E3=81=AE=E8=BF=BD=E5=8A=A0?=
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---
 src/commands/add.ts            | 10 ++++++++++
 src/functions/is-valid-path.ts | 23 +++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 src/functions/is-valid-path.ts

diff --git a/src/commands/add.ts b/src/commands/add.ts
index eadcac0..609527e 100644
--- a/src/commands/add.ts
+++ b/src/commands/add.ts
@@ -3,6 +3,7 @@ import { readFile } from "node:fs/promises";
 import { GIT_INDEX } from "../constants.js";
 import { coloredLog } from "../functions/colored-log.js";
 import { exists } from "../functions/exists.js";
+import { isValidPath } from "../functions/is-valid-path.js";
 import { BlobObject } from "../models/blob-object.js";
 import { GitIndex } from "../models/git-index.js";
 
@@ -19,6 +20,15 @@ export const add = async (options: Array<string>): Promise<void> => {
     return;
   }
 
+  //ファイル名が条件を満たしていない場合の処理
+  if (!isValidPath(filePath)) {
+    coloredLog({
+      text: `fatal: invalid path '${filePath}'`,
+      color: "red",
+    });
+    return;
+  }
+
   //ファイルが存在しなかった場合の処理
   if (!(await exists(filePath))) {
     coloredLog({
diff --git a/src/functions/is-valid-path.ts b/src/functions/is-valid-path.ts
new file mode 100644
index 0000000..5bd0f1c
--- /dev/null
+++ b/src/functions/is-valid-path.ts
@@ -0,0 +1,23 @@
+// パス名がgitの定める条件に従っているかをチェック
+// https://github.com/git/git/blob/v2.12.0/Documentation/technical/index-format.txt
+export const isValidPath = (filePath: string): boolean => {
+  // トップレベルディレクトリからの相対パスであることを確認（先頭のスラッシュがないこと）
+  if (filePath.startsWith("/")) {
+    return false;
+  }
+
+  // 末尾のスラッシュを禁止
+  if (filePath.endsWith("/")) {
+    return false;
+  }
+
+  // パスコンポーネントをチェック
+  const components = filePath.split("/");
+  for (const component of components) {
+    if (component === "." || component === ".." || component === ".git") {
+      return false;
+    }
+  }
+
+  return true;
+};