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World's smallest micro-optimization #2318

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World's smallest micro-optimization #2318

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23 changes: 17 additions & 6 deletions core/src/main/scala/caliban/wrappers/ApolloPersistedQueries.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -120,15 +120,26 @@ object ApolloPersistedQueries {
case _ => None
}

private def hex(bytes: Array[Byte]): String = {
val builder = new mutable.StringBuilder(bytes.length * 2)
bytes.foreach(byte => builder.append(f"$byte%02x".toLowerCase))
builder.mkString
}
private val HexArray: Array[Char] = "0123456789abcdef".toCharArray

private def checkHash(hash: String, query: String): Boolean = {
val sha256 = java.security.MessageDigest.getInstance("SHA-256")
val digest = sha256.digest(query.getBytes(StandardCharsets.UTF_8))
hex(digest) == hash
digestMatchesHash(digest, hash)
}

private def digestMatchesHash(digest: Array[Byte], hash: String): Boolean = {
val chars = hash.toCharArray
val size = digest.length
var j = 0
var res = chars.length == size * 2
while (j < size && res) {
val v = digest(j) & 0xff
if (chars(j * 2) == HexArray(v >>> 4) && chars(j * 2 + 1) == HexArray(v & 0xf)) ()
else res = false
j += 1
}
res
}

}