From af157934abb1ee172cffd015acbabb065f0e1dbf Mon Sep 17 00:00:00 2001
From: denisx <github.com@denisx.com>
Date: Tue, 4 Jun 2024 20:44:18 +0300
Subject: [PATCH] feat: add digestType 'base64safe' (#259)

---
 README.md                  |  8 +++++---
 lib/getHashDigest.js       | 13 +++++++++----
 test/getHashDigest.test.js |  1 +
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index a9aee06..f142c6e 100644
--- a/README.md
+++ b/README.md
@@ -76,17 +76,19 @@ The following tokens are replaced in the `name` parameter:
 - `[contenthash]` the hash of `options.content` (Buffer) (by default it's the hex digest of the `xxhash64` hash)
 - `[<hashType>:contenthash:<digestType>:<length>]` optionally one can configure
   - other `hashType`s, i. e. `xxhash64`, `sha1`, `md4` (wasm version), `native-md4` (`crypto` module version), `md5`, `sha256`, `sha512`
-  - other `digestType`s, i. e. `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64`
+  - other `digestType`s, i. e. `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64`, `base64safe`
   - and `length` the length in chars
 - `[hash]` the hash of `options.content` (Buffer) (by default it's the hex digest of the `xxhash64` hash)
 - `[<hashType>:hash:<digestType>:<length>]` optionally one can configure
   - other `hashType`s, i. e. `xxhash64`, `sha1`, `md4` (wasm version), `native-md4` (`crypto` module version), `md5`, `sha256`, `sha512`
-  - other `digestType`s, i. e. `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64`
+  - other `digestType`s, i. e. `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64`, `base64safe`
   - and `length` the length in chars
 - `[N]` the N-th match obtained from matching the current file name against `options.regExp`
 
 In loader context `[hash]` and `[contenthash]` are the same, but we recommend using `[contenthash]` for avoid misleading.
 
+`digestType` with `base64safe` don't contain `/`, `+` and `=` symbols.
+
 Examples
 
 ```javascript
@@ -157,7 +159,7 @@ const digestString = loaderUtils.getHashDigest(
 
 - `buffer` the content that should be hashed
 - `hashType` one of `xxhash64`, `sha1`, `md4`, `md5`, `sha256`, `sha512` or any other node.js supported hash type
-- `digestType` one of `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64`
+- `digestType` one of `hex`, `base26`, `base32`, `base36`, `base49`, `base52`, `base58`, `base62`, `base64`, `base64safe`
 - `maxLength` the maximum length in chars
 
 ## License
diff --git a/lib/getHashDigest.js b/lib/getHashDigest.js
index 600b86e..5cbeb6a 100644
--- a/lib/getHashDigest.js
+++ b/lib/getHashDigest.js
@@ -120,12 +120,17 @@ function getHashDigest(buffer, algorithm, digestType, maxLength) {
     digestType === "base49" ||
     digestType === "base52" ||
     digestType === "base58" ||
-    digestType === "base62"
+    digestType === "base62" ||
+    digestType === "base64safe"
   ) {
-    return encodeBufferToBase(hash.digest(), digestType.substr(4), maxLength);
-  } else {
-    return hash.digest(digestType || "hex").substr(0, maxLength);
+    return encodeBufferToBase(
+      hash.digest(),
+      digestType === "base64safe" ? 64 : digestType.substr(4),
+      maxLength
+    );
   }
+
+  return hash.digest(digestType || "hex").substr(0, maxLength);
 }
 
 module.exports = getHashDigest;
diff --git a/test/getHashDigest.test.js b/test/getHashDigest.test.js
index e993f11..d647a1c 100644
--- a/test/getHashDigest.test.js
+++ b/test/getHashDigest.test.js
@@ -21,6 +21,7 @@ describe("getHashDigest()", () => {
     ["abc\\0💩", "md4", "hex", undefined, "45aa5b332f8e562aaf0106ad6fc1d78f"],
     ["abc\\0💩", "md4", "base64", undefined, "RapbMy+OViqvAQatb8HXjw=="],
     ["abc\\0♥", "md4", "base64", undefined, "Rrlif+z0m4Dq8BwB2Grp/Q=="],
+    ["abc\\0♥", "md4", "base64safe", undefined, "3ZWmHo0hPMWE2rZeN_oHB6"],
     ["abc\\0💩", "md4", "base52", undefined, "dtXZENFEkYHXGxOkJbevPoD"],
     ["abc\\0♥", "md4", "base52", undefined, "fYFFcfXRGsVweukHKlPayHs"],