prefetch-npm-deps: switch to data-encoding

pkgs/build-support/node/fetch-npm-deps/Cargo.lock

···
 ]
 
 [[package]]
-name = "base64"
-version = "0.22.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9475866fec1451be56a3c2400fd081ff546538961565ccb5b7142cbd22bc7a51"
-
-[[package]]
 name = "bitflags"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
···
  "vcpkg",
  "windows-sys 0.52.0",
 ]
+
+[[package]]
+name = "data-encoding"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e962a19be5cfc3f3bf6dd8f61eb50107f356ad6270fbb3ed41476571db78be5"
 
 [[package]]
 name = "digest"
···
 dependencies = [
  "anyhow",
  "backoff",
- "base64",
+ "data-encoding",
  "digest",
  "env_logger",
  "isahc",

pkgs/build-support/node/fetch-npm-deps/Cargo.toml

···
 [dependencies]
 anyhow = "1.0.82"
 backoff = "0.4.0"
-base64 = "0.22.0"
+data-encoding = "2.5.0"
 digest = "0.10.7"
 env_logger = "0.11.3"
 isahc = { version = "1.7.2", default_features = false }

pkgs/build-support/node/fetch-npm-deps/src/cacache.rs

···
-use base64::prelude::{Engine, BASE64_STANDARD};
+use data_encoding::BASE64;
 use digest::{Digest, Update};
 use serde::{Deserialize, Serialize};
 use sha1::Sha1;
···
         integrity: Option<String>,
     ) -> anyhow::Result<()> {
         let (algo, hash, integrity) = if let Some(integrity) = integrity {
-            let (algo, hash) = integrity.split_once('-').unwrap();
+            let (algo, hash) = integrity
+                .split_once('-')
+                .expect("hash should be SRI format");
 
-            (algo.to_string(), BASE64_STANDARD.decode(hash)?, integrity)
+            (algo.to_string(), BASE64.decode(hash.as_bytes())?, integrity)
         } else {
             let hash = Sha512::new().chain(data).finalize();
 
             (
                 String::from("sha512"),
                 hash.to_vec(),
-                format!("sha512-{}", BASE64_STANDARD.encode(hash)),
+                format!("sha512-{}", BASE64.encode(&hash)),
             )
         };
 

pkgs/build-support/node/fetch-npm-deps/src/util.rs

···
 use backoff::{retry, ExponentialBackoff};
-use base64::prelude::{Engine, BASE64_STANDARD};
+use data_encoding::BASE64;
 use digest::Digest;
 use isahc::{
     config::{CaCertificate, Configurable, RedirectPolicy, SslOption},
···
 
     io::copy(&mut encoder, &mut hasher)?;
 
-    Ok(format!(
-        "sha256-{}",
-        BASE64_STANDARD.encode(hasher.finalize())
-    ))
+    Ok(format!("sha256-{}", BASE64.encode(&hasher.finalize())))
 }