Major rewrite

* use dep for vendoring
* lets encrypt
* moved web to transfer.sh-web repo
* single command install
* added first tests

vendor/github.com/golang/gddo/httputil/transport.go

@@ -0,0 +1,134 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd.
+
+// This file implements a http.RoundTripper that authenticates
+// requests issued against api.github.com endpoint.
+
+package httputil
+
+import (
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+
+	"cloud.google.com/go/compute/metadata"
+)
+
+// AuthTransport is an implementation of http.RoundTripper that authenticates
+// with the GitHub API.
+//
+// When both a token and client credentials are set, the latter is preferred.
+type AuthTransport struct {
+	UserAgent    string
+	Token        string
+	ClientID     string
+	ClientSecret string
+	Base         http.RoundTripper
+}
+
+// NewAuthTransport gives new AuthTransport created with GitHub credentials
+// read from GCE metadata when the metadata server is accessible (we're on GCE)
+// or read from environment varialbes otherwise.
+func NewAuthTransport(base http.RoundTripper) *AuthTransport {
+	if metadata.OnGCE() {
+		return NewAuthTransportFromMetadata(base)
+	}
+	return NewAuthTransportFromEnvironment(base)
+}
+
+// NewAuthTransportFromEnvironment gives new AuthTransport created with GitHub
+// credentials read from environment variables.
+func NewAuthTransportFromEnvironment(base http.RoundTripper) *AuthTransport {
+	return &AuthTransport{
+		UserAgent:    os.Getenv("USER_AGENT"),
+		Token:        os.Getenv("GITHUB_TOKEN"),
+		ClientID:     os.Getenv("GITHUB_CLIENT_ID"),
+		ClientSecret: os.Getenv("GITHUB_CLIENT_SECRET"),
+		Base:         base,
+	}
+}
+
+// NewAuthTransportFromMetadata gives new AuthTransport created with GitHub
+// credentials read from GCE metadata.
+func NewAuthTransportFromMetadata(base http.RoundTripper) *AuthTransport {
+	return &AuthTransport{
+		UserAgent:    gceAttr("user-agent"),
+		Token:        gceAttr("github-token"),
+		ClientID:     gceAttr("github-client-id"),
+		ClientSecret: gceAttr("github-client-secret"),
+		Base:         base,
+	}
+}
+
+// RoundTrip implements the http.RoundTripper interface.
+func (t *AuthTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	var reqCopy *http.Request
+	if t.UserAgent != "" {
+		reqCopy = copyRequest(req)
+		reqCopy.Header.Set("User-Agent", t.UserAgent)
+	}
+	if req.URL.Host == "api.github.com" {
+		switch {
+		case t.ClientID != "" && t.ClientSecret != "":
+			if reqCopy == nil {
+				reqCopy = copyRequest(req)
+			}
+			if reqCopy.URL.RawQuery == "" {
+				reqCopy.URL.RawQuery = "client_id=" + t.ClientID + "&client_secret=" + t.ClientSecret
+			} else {
+				reqCopy.URL.RawQuery += "&client_id=" + t.ClientID + "&client_secret=" + t.ClientSecret
+			}
+		case t.Token != "":
+			if reqCopy == nil {
+				reqCopy = copyRequest(req)
+			}
+			reqCopy.Header.Set("Authorization", "token "+t.Token)
+		}
+	}
+	if reqCopy != nil {
+		return t.base().RoundTrip(reqCopy)
+	}
+	return t.base().RoundTrip(req)
+}
+
+// CancelRequest cancels an in-flight request by closing its connection.
+func (t *AuthTransport) CancelRequest(req *http.Request) {
+	type canceler interface {
+		CancelRequest(req *http.Request)
+	}
+	if cr, ok := t.base().(canceler); ok {
+		cr.CancelRequest(req)
+	}
+}
+
+func (t *AuthTransport) base() http.RoundTripper {
+	if t.Base != nil {
+		return t.Base
+	}
+	return http.DefaultTransport
+}
+
+func gceAttr(name string) string {
+	s, err := metadata.ProjectAttributeValue(name)
+	if err != nil {
+		log.Printf("error querying metadata for %q: %s", name, err)
+		return ""
+	}
+	return s
+}
+
+func copyRequest(req *http.Request) *http.Request {
+	req2 := new(http.Request)
+	*req2 = *req
+	req2.URL = new(url.URL)
+	*req2.URL = *req.URL
+	req2.Header = make(http.Header, len(req.Header))
+	for k, s := range req.Header {
+		req2.Header[k] = append([]string(nil), s...)
+	}
+	return req2
+}