1 files changed, 58 insertions, 0 deletions
diff --git a/gpg/skeybase/src/main/scala/com/github/jodersky/skeybase/openpgp/GnuPG.scala b/gpg/skeybase/src/main/scala/com/github/jodersky/skeybase/openpgp/GnuPG.scala
new file mode 100644
index 0000000..3b2d152
--- /dev/null
+++ b/gpg/skeybase/src/main/scala/com/github/jodersky/skeybase/openpgp/GnuPG.scala
@@ -0,0 +1,58 @@
+package com.github.jodersky.skeybase
+package openpgp
+
+import java.io.File
+import scala.sys.process._
+import java.io.ByteArrayInputStream
+import scala.collection.mutable.ArrayBuffer
+import verification.VerificationException
+import scala.util.Try
+
+class GnuPG(
+    val home: File = new File("."),
+    val command: String = "/usr/bin/gpg")
+  extends Backend {
+
+  import GnuPG._
+
+  private val _gpg = s"${command} --home=${home.getAbsolutePath} --no-default-keyring --keyring=temp.gpg --status-fd=2"
+  private def gpg(args: String) = _gpg + " " + args
+
+  def importKey(key: String) = {
+    val result = (gpg("--import -") #< stream(key)).!
+    result == 0
+  }
+
+  def verifySignature(statement: String, fingerprint: String): Try[String] = Try{
+    val stdout = new StringBuilder
+    val stderr = new ArrayBuffer[String]
+
+    val status = (gpg("-d -") #< stream(statement)) ! ProcessLogger(stdout append _, stderr append _)
+    
+    if (status != 0) throw new VerificationException("gpg exited with non-zero exit code")
+
+    /* see doc/DETAILS of GnuPG for more information about structure */
+    def fpr(line: String) = """\[GNUPG:\] VALIDSIG (\S+\s+){9}(\w+)""".r findPrefixMatchOf (line) map { m =>
+      m.group(2)
+    }
+    
+    val valid = stderr find (fpr(_) == Some(fingerprint))
+    
+    if (valid.isEmpty) {
+      throw new VerificationException("Statement is not signed by the correct key.")
+    } else {
+      stdout.toString()
+    }
+  }
+
+}
+
+object GnuPG {
+
+  private def stream(str: String) = {
+    val bytes = str.getBytes("UTF-8")
+    new ByteArrayInputStream(bytes)
+  }
+
+  val tmp = "~/.skeybase"
+}
+\ No newline at end of file