Add back support for some checksum format

cache/src/main/scala/coursier/Cache.scala

@@ -444,18 +444,28 @@ object Cache {
     Nondeterminism[Task].gather(tasks)
   }
 
+  def parseChecksum(content: String): Option[BigInteger] = {
+    val lines = content
+      .linesIterator
+      .toVector
+
+    parseChecksumLine(lines) orElse parseChecksumAlternative(lines)
+  }
+
   // matches md5 or sha1
   private val checksumPattern = Pattern.compile("^[0-9a-f]{32}([0-9a-f]{8})?")
 
-  def parseChecksum(content: String): Option[BigInteger] =
-    content
-      .linesIterator
-      .toStream
-      .map(_.toLowerCase.replaceAll("\\s", ""))
-      .collectFirst {
-        case rawSum if checksumPattern.matcher(rawSum).matches() =>
-          new BigInteger(rawSum, 16)
-      }
+  private def findChecksum(elems: Seq[String]): Option[BigInteger] =
+    elems.collectFirst {
+      case rawSum if checksumPattern.matcher(rawSum).matches() =>
+        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+")))
 
   def validateChecksum(
     artifact: Artifact,

tests/jvm/src/test/scala/coursier/test/ChecksumTests.scala

@@ -14,22 +14,37 @@ object ChecksumTests extends TestSuite {
   val tests = TestSuite {
 
     'parse - {
-      // https://repo1.maven.org/maven2/org/apache/spark/spark-core_2.11/1.2.0/spark-core_2.11-1.2.0.pom.sha1
-      // as of 2016-03-02
-      val junkSha1 =
-        "./spark-core_2.11/1.2.0/spark-core_2.11-1.2.0.pom:\n" +
-          "5630 42A5 4B97 E31A F452  9EA0 DB79 BA2C 4C2B B6CC"
 
-      val cleanSha1 = "563042a54b97e31af4529ea0db79ba2c4c2bb6cc"
+      def sha1ParseTest(clean: String, others: String*): Unit = {
+        val expected = Some(new BigInteger(clean, 16))
 
-      val checksum = Some(new BigInteger(cleanSha1, 16))
-
-      'junk - {
-        assert(Cache.parseChecksum(junkSha1) == checksum)
+        assert(Cache.parseChecksum(clean) == expected)
+        for (other <- others)
+          assert(Cache.parseChecksum(other) == expected)
       }
 
-      'clean - {
-        assert(Cache.parseChecksum(cleanSha1) == checksum)
+      * - {
+        // https://repo1.maven.org/maven2/org/apache/spark/spark-core_2.11/1.2.0/spark-core_2.11-1.2.0.pom.sha1
+        // as of 2016-03-02
+        val junkSha1 =
+          "./spark-core_2.11/1.2.0/spark-core_2.11-1.2.0.pom:\n" +
+          "5630 42A5 4B97 E31A F452  9EA0 DB79 BA2C 4C2B B6CC"
+
+        val cleanSha1 = "563042a54b97e31af4529ea0db79ba2c4c2bb6cc"
+
+        sha1ParseTest(cleanSha1, junkSha1)
+      }
+
+      * - {
+        // https://repo1.maven.org/maven2/org/json/json/20080701/json-20080701.pom.sha1
+        // as of 2016-03-05
+        val dirtySha1 =
+          "4bf5daa95eb5c12d753a359a3e00621fdc73d187  " + // no CR here
+          "/home/maven/repository-staging/to-ibiblio/maven2/org/json/json/20080701/json-20080701.pom"
+
+        val cleanSha1 = "4bf5daa95eb5c12d753a359a3e00621fdc73d187"
+
+        sha1ParseTest(cleanSha1, dirtySha1)
       }
     }