From 1196d6c7bfd22548cd843eb7e70588ba5718e241 Mon Sep 17 00:00:00 2001
From: klmhyeonwoo <gentlemonster77@likelion.org>
Date: Mon, 1 Sep 2025 21:30:39 +0900
Subject: [PATCH 1/2] feat: Add checkBase64 util function

---
 README.md                                        |  2 ++
 package/validationUtil/checkBase64/index.test.ts | 14 ++++++++++++++
 package/validationUtil/checkBase64/index.ts      |  5 +++++
 package/validationUtil/index.ts                  |  1 +
 4 files changed, 22 insertions(+)
 create mode 100644 package/validationUtil/checkBase64/index.test.ts
 create mode 100644 package/validationUtil/checkBase64/index.ts

diff --git a/README.md b/README.md
index 4410022..9eff0bf 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ const difference = numberUtil.subtract(10, 3); // 7
 const isValid = validationUtil.checkEmail("user@example.com"); // true
 const isHttpUrl = validationUtil.checkHttpUrl("https://example.com"); // true
 const isDomain = validationUtil.checkDomain("example.com"); // true
+const isBase64 = validationUtil.checkBase64("U29tZSB2YWxpZCBiYXNlNjQgc3RyaW5n"); // true
 
 // Common utilities
 const empty = commonUtil.isEmpty(""); // true
@@ -83,6 +84,7 @@ const theme = cookieUtil.getCookie("theme");
 - `checkEmail(email: string): boolean` - Validates email format
 - `checkHttpUrl(url: string): boolean` - Validates HTTP/HTTPS URL format
 - `checkDomain(domain: string): boolean` - Validates domain name format
+- `checkBase64(value: string): boolean` - Validates whether a string is a valid base64 encoded value
 
 ### CommonUtil
 
diff --git a/package/validationUtil/checkBase64/index.test.ts b/package/validationUtil/checkBase64/index.test.ts
new file mode 100644
index 0000000..11cbf40
--- /dev/null
+++ b/package/validationUtil/checkBase64/index.test.ts
@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+import checkBase64 from ".";
+
+describe("checkBase64 유틸 함수 테스트", () => {
+  it("유효한 base64 문자열에 대해 true를 반환해야 합니다.", () => {
+    expect(checkBase64("U29tZSB2YWxpZCBiYXNlNjQgc3RyaW5n")).toBe(true);
+    expect(checkBase64("SGVsbG8gd29ybGQ=")).toBe(true);
+  });
+
+  it("유효하지 않은 base64 문자열에 대해 false를 반환해야 합니다.", () => {
+    expect(checkBase64("bfdbfdbsba")).toBe(false);
+    expect(checkBase64("U29tZSB2YWxpZCBiYXNlNjQgc3RyaW5n===")).toBe(false);
+  });
+});
diff --git a/package/validationUtil/checkBase64/index.ts b/package/validationUtil/checkBase64/index.ts
new file mode 100644
index 0000000..0967742
--- /dev/null
+++ b/package/validationUtil/checkBase64/index.ts
@@ -0,0 +1,5 @@
+export default function checkBase64(value: string): boolean {
+  const base64Regex =
+    /^(?:[A-Z0-9+\/]{4})*(?:[A-Z0-9+\/]{2}==|[A-Z0-9+\/]{3}=)?$/i;
+  return base64Regex.test(value);
+}
diff --git a/package/validationUtil/index.ts b/package/validationUtil/index.ts
index f6f495d..e49429b 100644
--- a/package/validationUtil/index.ts
+++ b/package/validationUtil/index.ts
@@ -1,3 +1,4 @@
 export { default as checkEmail } from "./checkEmail";
 export { default as checkHttpUrl } from "./checkHttpUrl";
 export { default as checkDomain } from "./checkDomain";
+export { default as checkBase64 } from "./checkBase64";

From adfb5abd233121b0ed7d007d9a635bc10dabb74f Mon Sep 17 00:00:00 2001
From: klmhyeonwoo <gentlemonster77@likelion.org>
Date: Mon, 1 Sep 2025 21:34:41 +0900
Subject: [PATCH 2/2] feat: Exception handling for empty strings

---
 package/validationUtil/checkBase64/index.test.ts | 5 +++++
 package/validationUtil/checkBase64/index.ts      | 1 +
 2 files changed, 6 insertions(+)

diff --git a/package/validationUtil/checkBase64/index.test.ts b/package/validationUtil/checkBase64/index.test.ts
index 11cbf40..639e6ff 100644
--- a/package/validationUtil/checkBase64/index.test.ts
+++ b/package/validationUtil/checkBase64/index.test.ts
@@ -11,4 +11,9 @@ describe("checkBase64 유틸 함수 테스트", () => {
     expect(checkBase64("bfdbfdbsba")).toBe(false);
     expect(checkBase64("U29tZSB2YWxpZCBiYXNlNjQgc3RyaW5n===")).toBe(false);
   });
+
+  it("만약 빈 문자열로 함수를 호출할 경우 false를 반환해야 합니다.", () => {
+    expect(checkBase64("")).toBe(false);
+    expect(checkBase64(" ")).toBe(false);
+  });
 });
diff --git a/package/validationUtil/checkBase64/index.ts b/package/validationUtil/checkBase64/index.ts
index 0967742..dfa2976 100644
--- a/package/validationUtil/checkBase64/index.ts
+++ b/package/validationUtil/checkBase64/index.ts
@@ -1,4 +1,5 @@
 export default function checkBase64(value: string): boolean {
+  if (value.trim() === "") return false;
   const base64Regex =
     /^(?:[A-Z0-9+\/]{4})*(?:[A-Z0-9+\/]{2}==|[A-Z0-9+\/]{3}=)?$/i;
   return base64Regex.test(value);