coursier.cache.CacheChecksum.scala Maven / Gradle / Ivy
package coursier.cache
import java.math.BigInteger
import java.nio.charset.StandardCharsets
import java.util.regex.Pattern
object CacheChecksum {
private val checksumLength = Set(
32, // md5
40, // sha-1
64, // sha-256
128 // sha-512
)
private def ifHexString(s: String) =
s.forall(c => c.isDigit || c >= 'a' && c <= 'f')
private def findChecksum(elems: Seq[String]): Option[BigInteger] =
elems.collectFirst {
case rawSum if ifHexString(rawSum) && checksumLength.contains(rawSum.length) =>
new BigInteger(rawSum, 16)
}
private def parseChecksumLine(lines: Seq[String]): Option[BigInteger] =
findChecksum(lines.map(_.toLowerCase.replaceAll("\\s", "")))
private def parseChecksumAlternative(lines: Seq[String]): Option[BigInteger] =
findChecksum(lines.flatMap(_.toLowerCase.split("\\s+"))).orElse {
findChecksum(
lines.map { line =>
line
.toLowerCase
.split("\\s+")
.filter(ifHexString)
.mkString
}
)
}
def parseChecksum(content: String): Option[BigInteger] = {
val lines = content.linesIterator.toVector
parseChecksumLine(lines).orElse(parseChecksumAlternative(lines))
}
def parseRawChecksum(content: Array[Byte]): Option[BigInteger] =
if (content.length == 16 || content.length == 20)
Some(new BigInteger(content))
else {
val s = new String(content, StandardCharsets.UTF_8)
val lines = s.linesIterator.toVector
parseChecksumLine(lines) orElse parseChecksumAlternative(lines)
}
}