Use a vendor directory for repeatable builds - fixes #816

This is using godep to manage the vendor directory.

vendor/github.com/aws/aws-sdk-go/service/s3/sse.go

@@ -0,0 +1,44 @@
+package s3
+
+import (
+	"crypto/md5"
+	"encoding/base64"
+
+	"github.com/aws/aws-sdk-go/aws/awserr"
+	"github.com/aws/aws-sdk-go/aws/awsutil"
+	"github.com/aws/aws-sdk-go/aws/request"
+)
+
+var errSSERequiresSSL = awserr.New("ConfigError", "cannot send SSE keys over HTTP.", nil)
+
+func validateSSERequiresSSL(r *request.Request) {
+	if r.HTTPRequest.URL.Scheme != "https" {
+		p, _ := awsutil.ValuesAtPath(r.Params, "SSECustomerKey||CopySourceSSECustomerKey")
+		if len(p) > 0 {
+			r.Error = errSSERequiresSSL
+		}
+	}
+}
+
+func computeSSEKeys(r *request.Request) {
+	headers := []string{
+		"x-amz-server-side-encryption-customer-key",
+		"x-amz-copy-source-server-side-encryption-customer-key",
+	}
+
+	for _, h := range headers {
+		md5h := h + "-md5"
+		if key := r.HTTPRequest.Header.Get(h); key != "" {
+			// Base64-encode the value
+			b64v := base64.StdEncoding.EncodeToString([]byte(key))
+			r.HTTPRequest.Header.Set(h, b64v)
+
+			// Add MD5 if it wasn't computed
+			if r.HTTPRequest.Header.Get(md5h) == "" {
+				sum := md5.Sum([]byte(key))
+				b64sum := base64.StdEncoding.EncodeToString(sum[:])
+				r.HTTPRequest.Header.Set(md5h, b64sum)
+			}
+		}
+	}
+}