Move helpers to separate file

1 files changed, 47 insertions, 0 deletions

diff --git a/utils_ct.go b/utils_ct.go
new file mode 100644
index 0000000..3c40ad0
--- /dev/null
+++ b/utils_ct.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"os"
+
+	"gitlab.torproject.org/rgdd/ct/pkg/metadata"
+)
+
+// logs select logs that count towards CT-compliance checks.  Logs that don't
+// have a description are skipped after printing a warning.
+func logs(md metadata.Metadata) (logs []metadata.Log) {
+	for _, operators := range md.Operators {
+		for _, log := range operators.Logs {
+			if log.Description == nil {
+				fmt.Fprintf(os.Stderr, "WARNING: skipping log without description")
+				continue
+			}
+			if log.State == nil {
+				continue // skip logs with unknown states
+			}
+			if log.State.Name == metadata.LogStatePending {
+				continue // pending logs do not count towards CT-compliance
+			}
+			if log.State.Name == metadata.LogStateRetired {
+				continue // retired logs are not necessarily reachable
+			}
+			if log.State.Name == metadata.LogStateRejected {
+				continue // rejected logs do not count towards CT-compliance
+			}
+
+			logs = append(logs, log)
+		}
+	}
+	return
+}
+
+// proof formats hashes so that they can be passed to the merkle package
+func proof(hashes [][]byte) (p [][sha256.Size]byte) {
+	for _, hash := range hashes {
+		var h [sha256.Size]byte
+		copy(h[:], hash)
+		p = append(p, h)
+	}
+	return
+}