server: add sort option

README.md

@@ -225,22 +225,24 @@ Run a static UI server for a registry.
 
 Flags:
 
-  -u, --username       username for the registry (default: <none>)
-  --listen-address     address to listen on (default: <none>)
   --asset-path         Path to assets and templates (default: <none>)
-  -f, --force-non-ssl  force allow use of non-ssl (default: false)
-  --once               generate the templates once and then exit (default: false)
-  --skip-ping          skip pinging the registry while establishing connection (default: false)
-  --timeout            timeout for HTTP requests (default: 1m0s)
+  --auth-url           alternate URL for registry authentication (ex. auth.docker.io) (default: <none>)
   --cert               path to ssl cert (default: <none>)
+  --clair              url to clair instance (default: <none>)
   -d                   enable debug logging (default: false)
+  -f, --force-non-ssl  force allow use of non-ssl (default: false)
+  --interval           interval to generate new index.html's at (default: 1h0m0s)
+  -k, --insecure       do not verify tls certificates (default: false)
   --key                path to ssl key (default: <none>)
+  --listen-address     address to listen on (default: <none>)
+  --once               generate the templates once and then exit (default: false)
+  -p, --password       password for the registry (default: <none>)
   --port               port for server to run on (default: 8080)
   -r, --registry       URL to the private registry (ex. r.j3ss.co) (default: <none>)
-  --clair              url to clair instance (default: <none>)
-  -k, --insecure       do not verify tls certificates (default: false)
-  --interval           interval to generate new index.html's at (default: 1h0m0s)
-  -p, --password       password for the registry (default: <none>)
+  --skip-ping          skip pinging the registry while establishing connection (default: false)
+  --sort               generate tag templates sorted by property (one of: created) (default: created)
+  --timeout            timeout for HTTP requests (default: 1m0s)
+  -u, --username       username for the registry (default: <none>)
 ```
 
 **Screenshots:**
@@ -283,4 +285,4 @@ against an insecure registry.
 **OR** 
 
 Run `make dind dtest` to avoid having to change your local docker config and
-to run the tests as docker-in-docker.
+to run the tests as docker-in-docker.

handlers.go

@@ -11,6 +11,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -28,6 +29,7 @@ type registryController struct {
 	l            sync.Mutex
 	tmpl         *template.Template
 	generateOnly bool
+	repoSortBy   string
 }
 
 type v1Compatibility struct {
@@ -44,6 +46,16 @@ type Repository struct {
 	VulnerabilityReport clair.VulnerabilityReport `json:"vulnerability"`
 }
 
+const (
+	sortByCreated = "created"
+)
+
+type repoByDate []Repository
+
+func (r repoByDate) Len() int           { return len(r) }
+func (r repoByDate) Less(i, j int) bool { return r[i].Created.Before(r[j].Created) }
+func (r repoByDate) Swap(i, j int)      { r[i], r[j] = r[j], r[i] }
+
 // An AnalysisResult holds all vulnerabilities of a scan
 type AnalysisResult struct {
 	Repositories   []Repository `json:"repositories"`
@@ -228,6 +240,11 @@ func (rc *registryController) generateTagsTemplate(ctx context.Context, repo str
 		result.Repositories = append(result.Repositories, rp)
 	}
 
+	switch rc.repoSortBy {
+	case sortByCreated:
+		sort.Sort(sort.Reverse(repoByDate(result.Repositories)))
+	}
+
 	// Execute the template.
 	var buf bytes.Buffer
 	if err := rc.tmpl.ExecuteTemplate(&buf, "tags", result); err != nil {

server.go

@@ -43,6 +43,10 @@ func (cmd *serverCommand) Register(fs *flag.FlagSet) {
 	fs.StringVar(&cmd.assetPath, "asset-path", "", "Path to assets and templates")
 
 	fs.BoolVar(&cmd.generateAndExit, "once", false, "generate the templates once and then exit")
+
+	sortOpts := []string{sortByCreated}
+	fs.StringVar(&cmd.repoSortBy, "sort", sortByCreated,
+		fmt.Sprintf("generate tag templates sorted by property (one of: %s)", strings.Join(sortOpts, ",")))
 }
 
 type serverCommand struct {
@@ -57,6 +61,7 @@ type serverCommand struct {
 	listenAddress string
 	port          string
 	assetPath     string
+	repoSortBy    string
 }
 
 func (cmd *serverCommand) Run(ctx context.Context, args []string) error {
@@ -66,10 +71,15 @@ func (cmd *serverCommand) Run(ctx context.Context, args []string) error {
 		return err
 	}
 
+	if cmd.repoSortBy != sortByCreated {
+		return fmt.Errorf("sort option invalid; '%s' is not valid", cmd.repoSortBy)
+	}
+
 	// Create the registry controller for the handlers.
 	rc := registryController{
 		reg:          r,
 		generateOnly: cmd.generateAndExit,
+		repoSortBy:   cmd.repoSortBy,
 	}
 
 	// Create a clair client if the user passed in a server address.