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-rw-r--r--lib/msgid.go34
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/msgid.go b/lib/msgid.go
new file mode 100644
index 0000000..8282d1d
--- /dev/null
+++ b/lib/msgid.go
@@ -0,0 +1,34 @@
+package lib
+
+// TODO: Remove this pending merge into github.com/emersion/go-message
+
+import (
+ "bytes"
+ "encoding/binary"
+ "fmt"
+ "math/rand"
+ "os"
+ "time"
+
+ "github.com/martinlindhe/base36"
+)
+
+// Generates an RFC 2822-complaint Message-Id based on the informational draft
+// "Recommendations for generating Message IDs", for lack of a better
+// authoritative source.
+func GenerateMessageId() string {
+ var (
+ now bytes.Buffer
+ nonce bytes.Buffer
+ )
+ binary.Write(&now, binary.BigEndian, time.Now().UnixNano())
+ binary.Write(&nonce, binary.BigEndian, rand.Uint64())
+ hostname, err := os.Hostname()
+ if err != nil {
+ hostname = "localhost"
+ }
+ return fmt.Sprintf("<%s.%s@%s>",
+ base36.EncodeBytes(now.Bytes()),
+ base36.EncodeBytes(nonce.Bytes()),
+ hostname)
+}