From 9b8e6383465471830e71b52c6183a4a6bee65dc9 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sat, 15 Oct 2016 00:17:41 +0200
Subject: added time operation to s5proxy

---
 src/daq/s5proxy/sample.json           |  4 +++-
 src/daq/s5proxy/src/s5proxy/config.go |  5 +++++
 src/daq/s5proxy/src/s5proxy/proxy.go  | 19 +++++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/daq/s5proxy/sample.json b/src/daq/s5proxy/sample.json
index 92737fa..65dc768 100644
--- a/src/daq/s5proxy/sample.json
+++ b/src/daq/s5proxy/sample.json
@@ -9,6 +9,8 @@
     "response_header": [
         { "op": "set", "header": "Cache-Control", "value": "no-cache" },
         { "op": "add", "header": "Cache-Control", "value": "no-store" },
-        { "op": "add", "header": "Cache-Control", "value": "must-revalidate" }
+        { "op": "add", "header": "Cache-Control", "value": "must-revalidate" },
+        { "op": "add", "header": "Cache-Control", "value": "max-age=0" },
+        { "op": "time", "header": "Expires", "value": "-1s" }
     ]
 }
diff --git a/src/daq/s5proxy/src/s5proxy/config.go b/src/daq/s5proxy/src/s5proxy/config.go
index 09fad61..c61a152 100644
--- a/src/daq/s5proxy/src/s5proxy/config.go
+++ b/src/daq/s5proxy/src/s5proxy/config.go
@@ -44,6 +44,7 @@ const (
 	OpAdd Operation = iota
 	OpDel
 	OpSet
+	OpTime
 )
 
 func (o Operation) String() string {
@@ -54,6 +55,8 @@ func (o Operation) String() string {
 		return "del"
 	case OpSet:
 		return "set"
+	case OpTime:
+		return "time"
 	}
 	return "unknown"
 }
@@ -66,6 +69,8 @@ func (o *Operation) fromString(str string) (err error) {
 		*o = OpDel
 	case "set":
 		*o = OpSet
+	case "time":
+		*o = OpTime
 	default:
 		return errors.New("invalid operation: '" + str + "'")
 	}
diff --git a/src/daq/s5proxy/src/s5proxy/proxy.go b/src/daq/s5proxy/src/s5proxy/proxy.go
index 09b6bd5..33cbc14 100644
--- a/src/daq/s5proxy/src/s5proxy/proxy.go
+++ b/src/daq/s5proxy/src/s5proxy/proxy.go
@@ -37,8 +37,19 @@ import (
 	"net/http"
 	"net/http/httputil"
 	"net/url"
+	"time"
 )
 
+func generateTime(input string) string {
+	d, err := time.ParseDuration(input)
+	if err != nil {
+		s5l.Printf("can't parse duration: %v", err)
+		return ""
+	}
+
+	return time.Now().Add(d).Format(time.RFC1123)
+}
+
 type s5proxyResponseWriter struct {
 	wrapped http.ResponseWriter
 	conf    *Config
@@ -61,6 +72,10 @@ func (r s5proxyResponseWriter) WriteHeader(status int) {
 			r.wrapped.Header().Del(h.Header)
 		case OpSet:
 			r.wrapped.Header().Set(h.Header, h.Value)
+		case OpTime:
+			if ts := generateTime(h.Value); ts != "" {
+				r.wrapped.Header().Set(h.Header, ts)
+			}
 		}
 	}
 	r.wrapped.WriteHeader(status)
@@ -100,6 +115,10 @@ func NewProxy(conf *Config) (p *Proxy, err error) {
 				req.Header.Del(h.Header)
 			case OpSet:
 				req.Header.Set(h.Header, h.Value)
+			case OpTime:
+				if ts := generateTime(h.Value); ts != "" {
+					req.Header.Set(h.Header, ts)
+				}
 			}
 		}
 	}
-- 
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