add pkg/client for (non-generated) client-related utilities (#149)

Signed-off-by: Jake Sanders <[email protected]>

Author: Jake Sanders

pkg/client/client.go

@@ -0,0 +1,35 @@
+// Copyright 2021 The Sigstore Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"net/url"
+
+	"github.com/go-openapi/runtime"
+	httptransport "github.com/go-openapi/runtime/client"
+	"github.com/go-openapi/strfmt"
+
+	genclient "github.com/sigstore/fulcio/pkg/generated/client"
+)
+
+// SigstorePublicServerURL is the URL of Sigstore's public Fulcio service.
+const SigstorePublicServerURL = "https://fulcio.sigstore.dev"
+
+// New returns a new client to interact with the given fulcio server.
+func New(server *url.URL) *genclient.Fulcio {
+	rt := httptransport.New(server.Host, genclient.DefaultBasePath, []string{server.Scheme})
+	rt.Consumers["application/pem-certificate-chain"] = runtime.TextConsumer()
+	return genclient.New(rt, strfmt.Default)
+}