Merge pull request #3 from flynn/persist-repository

Support creating and modifying repos

client/client.go

@@ -0,0 +1,95 @@
+package client
+
+import (
+	"errors"
+	"io"
+	"time"
+
+	"github.com/flynn/go-tuf"
+	"github.com/flynn/go-tuf/data"
+)
+
+var (
+	ErrNotFound   = errors.New("tuf: file not found")
+	ErrLatest     = errors.New("tuf: the current version is the latest")
+	ErrWrongSize  = errors.New("tuf: unexpected file size")
+	ErrNoRootKeys = errors.New("tuf: no root keys found in local meta store")
+)
+
+type RemoteStore interface {
+	Get(name string, size int64) (io.ReadCloser, error)
+}
+
+type Client struct {
+	repo   *tuf.Repo
+	remote RemoteStore
+}
+
+// TODO: Client needs root keys
+func NewClient(local tuf.LocalStore, remote RemoteStore) (*Client, error) {
+	repo, err := tuf.NewRepo(local)
+	if err != nil {
+		return nil, err
+	}
+	return &Client{repo, remote}, nil
+}
+
+func (c *Client) Update() error {
+	// check for root keys
+
+	// if no meta, get root.json
+	// if meta, get timestamp.json
+	// if new, get snapshot.json
+	// if new root.json, restart
+	// if new targets.json update
+	// fully check all signatures
+
+	/*
+		If at any point in the following process there is a problem (e.g., only expired
+		metadata can be retrieved), the Root file is downloaded and the process starts
+		over. Optionally, the software update system using the framework can decide how
+		to proceed rather than automatically downloading a new Root file.
+
+			TUF downloads and verifies timestamp.json.
+
+			If timestamp.json indicates that snapshot.json has changed, TUF downloads
+			and verifies snapshot.json.
+
+			TUF determines which metadata files listed in snapshot.json differ from
+			those described in the last snapshot.json that TUF has seen. If root.json
+			has changed, the update process starts over using the new root.json.
+
+			TUF provides the software update system with a list of available files
+			according to targets.json.
+	*/
+
+	return nil
+}
+
+func (c *Client) Expires() time.Time {
+	return time.Time{}
+}
+
+func (c *Client) Version() int {
+	return 0
+}
+
+func (c *Client) Files() data.Files {
+	return nil
+}
+
+type Destination interface {
+	io.Writer
+	Size() (int, error)
+	Delete() error
+}
+
+func (c *Client) Download(name string, dest Destination) error {
+	/*
+		The software update system instructs TUF to download a specific target file.
+
+		TUF downloads and verifies the file and then makes the file available to the
+		software update system.
+	*/
+	return nil
+}

client_test.go → client/client_test.go

@@ -1,9 +1,10 @@
-package tuf
+package client
 
 import (
 	"io"
 	"testing"
 
+	"github.com/flynn/go-tuf"
 	. "gopkg.in/check.v1"
 )
 
@@ -34,6 +35,7 @@ type FakeFile struct {
 
 func (ClientSuite) TestFirstUpdate(c *C) {
 	remote := make(FakeRemoteStore)
-	r := NewRepo(MemoryLocalStore(), remote)
+	r, err := NewClient(tuf.MemoryStore(nil, nil), remote)
+	c.Assert(err, IsNil)
 	_ = r
 }