1 files changed, 35 insertions, 3 deletions
diff --git a/client/client.go b/client/client.go
index 551eff7..34fa8a2 100644
--- a/client/client.go
+++ b/client/client.go
@@ -49,7 +49,7 @@ func NewClientFromPath(logId, chainPath, keyPath, operatorsPath string, cli *htt
 	}
 
 	k, err := stfe.LoadEd25519SigningKey(keyPath)
-	if err != nil {
+	if err != nil && keyPath != "" {
 		return nil, err
 	}
 
@@ -119,8 +119,24 @@ func (c *Client) AddEntry(ctx context.Context, name, checksum []byte) (*stfe.StI
 }
 
 func (c *Client) GetSth(ctx context.Context) (*stfe.StItem, error) {
-	glog.V(2).Info("creating get-sth request")
-	return nil, fmt.Errorf("TODO")
+	req, err := http.NewRequest("GET", c.protocol()+c.Log.BaseUrl+"/get-sth", nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed creating http request: %v", err)
+	}
+	glog.V(2).Infof("created request: %s %s", req.Method, req.URL)
+
+	item, err := c.doRequestWithStItemResponse(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+	if item.Format != stfe.StFormatSignedTreeHeadV1 {
+		return nil, fmt.Errorf("bad StItem format: %v", item.Format)
+	}
+	if err := item.SignedTreeHeadV1.Verify(c.Log.Scheme, c.Log.PublicKey); err != nil {
+		return nil, fmt.Errorf("bad SignedDebugInfoV1 signature: %v", err)
+	}
+	glog.V(2).Infof("get-sth request succeeded")
+	return item, nil
 }
 
 func (c *Client) GetConsistencyProof(ctx context.Context, first, second uint64) (*stfe.StItem, error) {
@@ -171,6 +187,22 @@ func (c *Client) doRequest(ctx context.Context, req *http.Request, out interface
 	return nil
 }
 
+func (c *Client) doRequestWithStItemResponse(ctx context.Context, req *http.Request) (*stfe.StItem, error) {
+	var itemStr string
+	if err := c.doRequest(ctx, req, &itemStr); err != nil {
+		return nil, err
+	}
+	b, err := base64.StdEncoding.DecodeString(itemStr)
+	if err != nil {
+		return nil, fmt.Errorf("failed decoding base64 body: %v", err)
+	}
+	var item stfe.StItem
+	if err := item.Unmarshal(b); err != nil {
+		return nil, fmt.Errorf("failed decoding StItem: %v", err)
+	}
+	return &item, nil
+}
+
 // protocol returns a protocol string that preceeds the log's base url
 func (c *Client) protocol() string {
 	if c.useHttp {