LogDog: Add project namespace to service endpoint.

common/logdog/types/streamsecret.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package types
 
 import (
         "crypto/rand"
-        "errors"
+        "fmt"
 )
 
 const (
-        // StreamSecretLength is the size, in bytes, of the stream secret.
+        // PrefixSecretLength is the size, in bytes, of the stream secret.
         //
         // This value was chosen such that it is:
         // - Sufficiently large to avoid collisions.
         // - Can be expressed as a Base64 string without ugly padding.
-        StreamSecretLength = 36
+        PrefixSecretLength = 36
 )
 
-// StreamSecret is the stream secret value. This is a Base64-encoded secret
+// PrefixSecret is the stream secret value. This is a Base64-encoded secret
 // value.
-type StreamSecret []byte
+type PrefixSecret []byte
 
-// NewStreamSecret generates a new, default-length secret parameter.
-func NewStreamSecret() (StreamSecret, error) {
-        buf := make([]byte, StreamSecretLength)
-        count, err := rand.Read(buf)
-        if err != nil {
+// NewPrefixSecret generates a new, default-length secret parameter.
+func NewPrefixSecret() (PrefixSecret, error) {
+        buf := make([]byte, PrefixSecretLength)
+        if _, err := rand.Read(buf); err != nil {
                 return nil, err
         }
-        if count != len(buf) {
-                return nil, errors.New("streamsecret: Generated secret with invalid size")
+
+        value := PrefixSecret(buf)
+        if err := value.Validate(); err != nil {
+                panic(err)
         }
-        return StreamSecret(buf), nil
+        return value, nil
 }
+
+// Validate confirms that this prefix secret is conformant.
+//
+// Note that this does not scan the byte contents of the secret for any
+// security-related parameters.
+func (s PrefixSecret) Validate() error {
+        if len(s) != PrefixSecretLength {
+                return fmt.Errorf("invalid prefix secret length (%d != %d)", len(s), PrefixSecretLength)
+        }
+        return nil
+}