From 342460ed9aaf7f7cf8f92ba13ee0787308694988 Mon Sep 17 00:00:00 2001
From: Nan Monnand Deng <monnand@gmail.com>
Date: Fri, 28 Jun 2013 17:24:54 -0400
Subject: [PATCH] inserted setUserAgent in each HTTP request

---
 docs/registry.go | 43 ++++++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 17 deletions(-)

diff --git a/docs/registry.go b/docs/registry.go
index 12ca3c4b..c51df1ac 100644
--- a/docs/registry.go
+++ b/docs/registry.go
@@ -105,33 +105,30 @@ type VersionChecker interface {
 	Version() string
 }
 
-func setUserAgentHeader(req *http.Request, baseVersions []VersionChecker, extra ...VersionChecker) error {
-	if len(baseVersions)+len(extra) == 0 {
-		return nil
+func doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) {
+	for _, cookie := range c.Jar.Cookies(req.URL) {
+		req.AddCookie(cookie)
 	}
-	userAgent := make(map[string]string, len(baseVersions)+len(extra))
+	return c.Do(req)
+}
 
-	for _, v := range baseVersions {
+func (r *Registry) setUserAgent(req *http.Request, extra ...VersionChecker) {
+	if len(r.baseVersions)+len(extra) == 0 {
+		return
+	}
+	userAgent := make(map[string]string, len(r.baseVersions)+len(extra))
+
+	for _, v := range r.baseVersions {
 		userAgent[v.Name()] = v.Version()
 	}
 	for _, v := range extra {
 		userAgent[v.Name()] = v.Version()
 	}
 
-	header, err := json.Marshal(userAgent)
+	header, _ := json.Marshal(userAgent)
 	userAgent = nil
-	if err != nil {
-		return err
-	}
 	req.Header.Set("User-Agent", string(header))
-	return nil
-}
-
-func doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) {
-	for _, cookie := range c.Jar.Cookies(req.URL) {
-		req.AddCookie(cookie)
-	}
-	return c.Do(req)
+	return
 }
 
 // Retrieve the history of a given image from the Registry.
@@ -142,6 +139,9 @@ func (r *Registry) GetRemoteHistory(imgID, registry string, token []string) ([]s
 		return nil, err
 	}
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
+	if err != nil {
+		return nil, err
+	}
 	res, err := r.client.Do(req)
 	if err != nil || res.StatusCode != 200 {
 		if res != nil {
@@ -188,6 +188,7 @@ func (r *Registry) GetRemoteImageJSON(imgID, registry string, token []string) ([
 		return nil, -1, fmt.Errorf("Failed to download json: %s", err)
 	}
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
+	r.setUserAgent(req, nil)
 	res, err := r.client.Do(req)
 	if err != nil {
 		return nil, -1, fmt.Errorf("Failed to download json: %s", err)
@@ -215,6 +216,7 @@ func (r *Registry) GetRemoteImageLayer(imgID, registry string, token []string) (
 		return nil, fmt.Errorf("Error while getting from the server: %s\n", err)
 	}
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
+	r.setUserAgent(req, nil)
 	res, err := r.client.Do(req)
 	if err != nil {
 		return nil, err
@@ -235,6 +237,7 @@ func (r *Registry) GetRemoteTags(registries []string, repository string, token [
 			return nil, err
 		}
 		req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
+		r.setUserAgent(req, nil)
 		res, err := r.client.Do(req)
 		if err != nil {
 			return nil, err
@@ -273,6 +276,7 @@ func (r *Registry) GetRepositoryData(indexEp, remote string) (*RepositoryData, e
 		req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password)
 	}
 	req.Header.Set("X-Docker-Token", "true")
+	r.setUserAgent(req, nil)
 
 	res, err := r.client.Do(req)
 	if err != nil {
@@ -336,6 +340,7 @@ func (r *Registry) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, regis
 	req.Header.Add("Content-type", "application/json")
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
 	req.Header.Set("X-Docker-Checksum", imgData.Checksum)
+	r.setUserAgent(req, nil)
 
 	utils.Debugf("Setting checksum for %s: %s", imgData.ID, imgData.Checksum)
 	res, err := doWithCookies(r.client, req)
@@ -370,6 +375,7 @@ func (r *Registry) PushImageLayerRegistry(imgID string, layer io.Reader, registr
 	req.ContentLength = -1
 	req.TransferEncoding = []string{"chunked"}
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
+	r.setUserAgent(req, nil)
 	res, err := doWithCookies(r.client, req)
 	if err != nil {
 		return fmt.Errorf("Failed to upload layer: %s", err)
@@ -407,6 +413,7 @@ func (r *Registry) PushRegistryTag(remote, revision, tag, registry string, token
 	}
 	req.Header.Add("Content-type", "application/json")
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
+	r.setUserAgent(req, nil)
 	req.ContentLength = int64(len(revision))
 	res, err := doWithCookies(r.client, req)
 	if err != nil {
@@ -439,6 +446,7 @@ func (r *Registry) PushImageJSONIndex(indexEp, remote string, imgList []*ImgData
 	req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password)
 	req.ContentLength = int64(len(imgListJSON))
 	req.Header.Set("X-Docker-Token", "true")
+	r.setUserAgent(req, nil)
 	if validate {
 		req.Header["X-Docker-Endpoints"] = regs
 	}
@@ -459,6 +467,7 @@ func (r *Registry) PushImageJSONIndex(indexEp, remote string, imgList []*ImgData
 		req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password)
 		req.ContentLength = int64(len(imgListJSON))
 		req.Header.Set("X-Docker-Token", "true")
+		r.setUserAgent(req, nil)
 		if validate {
 			req.Header["X-Docker-Endpoints"] = regs
 		}