From be83492de15dc92a6fc4b0c0b7d9babfc57a0d5b Mon Sep 17 00:00:00 2001
From: Amal Francis <amalfra@gmail.com>
Date: Sun, 12 Mar 2017 02:07:28 +0530
Subject: [PATCH] hello world

---
 Makefile |  9 +++++++++
 etag.go  | 25 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 Makefile
 create mode 100644 etag.go

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..2e16225
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: all
+
+fmt:
+	go fmt ./...
+
+vet:
+	go vet ./...
+
+build: fmt vet
\ No newline at end of file
diff --git a/etag.go b/etag.go
new file mode 100644
index 0000000..8036294
--- /dev/null
+++ b/etag.go
@@ -0,0 +1,25 @@
+package etag
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+)
+
+func getHash(str string) string {
+	h := sha1.New()
+	h.Write([]byte(str))
+
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+// Generate an Etag for given sring. Allows specifying whether to generate weak
+// Etag or not as second parameter
+func Generate(str string, weak bool) string {
+	tag := fmt.Sprintf("%d-%s", len(str), getHash(str))
+	if weak {
+		tag = "W/" + tag
+	}
+
+	return tag
+}