Remove the now-unused appengine directory.

https://bugs.torproject.org/33429

.travis.yml

@@ -28,7 +28,6 @@ install:
     - go get -u github.com/dchest/uniuri
     - go get -u github.com/gorilla/websocket
     - go get -u git.torproject.org/pluggable-transports/goptlib.git
-    - go get -u google.golang.org/appengine
     - go get -u golang.org/x/crypto/acme/autocert
     - go get -u golang.org/x/net/http2
     - pushd proxy

appengine/.gcloudignore

-# This file specifies files that are *not* uploaded to Google Cloud Platform
-# using gcloud. It follows the same syntax as .gitignore, with the addition of
-# "#!include" directives (which insert the entries of the given .gitignore-style
-# file at that point).
-#
-# For more information, run:
-#   $ gcloud topic gcloudignore
-#
-.gcloudignore
-# If you would like to upload your .git directory, .gitignore file or files
-# from your .gitignore file, remove the corresponding line
-# below:
-.git
-.gitignore
-
-# Binaries for programs and plugins
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-# Test binary, build with `go test -c`
-*.test
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
\ No newline at end of file

appengine/README

-This component runs on Google App Engine. It reflects domain-fronted
-requests from a client to the Snowflake broker.
-
-You need the Go App Engine SDK in order to deploy the app.
-	https://cloud.google.com/sdk/docs/#linux
-After unpacking, install the app-engine-go component:
-	google-cloud-sdk/bin/gcloud components install app-engine-go
-
-To test locally, run
-	google-cloud-sdk/bin/dev_appserver.py app.yaml
-The app will be running at http://127.0.0.1:8080/.
-
-To deploy to App Engine, first create a new project and app. You have to
-think of a unique name (marked as "<appname>" in the commands). You only
-have to do the "create" step once; subsequent times you can go straight
-to the "deploy" step. The "gcloud auth login" command will open a
-browser window so you can log in to a Google account.
-	google-cloud-sdk/bin/gcloud auth login
-	google-cloud-sdk/bin/gcloud projects create <appname>
-	google-cloud-sdk/bin/gcloud app create --project=<appname>
-Then to deploy the project, run:
-	google-cloud-sdk/bin/gcloud app deploy --project=<appname>
-
-To configure the Snowflake client to talk to the App Engine app, provide
-"https://<appname>.appspot.com/" as the --url option.
-	UseBridges 1
-	Bridge snowflake 0.0.2.0:1
-	ClientTransportPlugin snowflake exec ./client -url https://<appname>.appspot.com/ -front www.google.com

appengine/app.yaml

-runtime: go111
-
-handlers:
-- url: /.*
-  secure: always
-  script: auto

appengine/reflect.go

-// A web app for Google App Engine that proxies HTTP requests and responses to
-// the Snowflake broker.
-package main
-
-import (
-	"context"
-	"io"
-	"net/http"
-	"net/url"
-	"time"
-
-	"google.golang.org/appengine"
-	"google.golang.org/appengine/log"
-	"google.golang.org/appengine/urlfetch"
-)
-
-const (
-	forwardURL = "https://snowflake-broker.bamsoftware.com/"
-	// A timeout of 0 means to use the App Engine default (5 seconds).
-	urlFetchTimeout = 20 * time.Second
-)
-
-var ctx context.Context
-
-// Join two URL paths.
-func pathJoin(a, b string) string {
-	if len(a) > 0 && a[len(a)-1] == '/' {
-		a = a[:len(a)-1]
-	}
-	if len(b) == 0 || b[0] != '/' {
-		b = "/" + b
-	}
-	return a + b
-}
-
-// We reflect only a whitelisted set of header fields. Otherwise, we may copy
-// headers like Transfer-Encoding that interfere with App Engine's own
-// hop-by-hop headers.
-var reflectedHeaderFields = []string{
-	"Content-Type",
-	"X-Session-Id",
-}
-
-// Make a copy of r, with the URL being changed to be relative to forwardURL,
-// and including only the headers in reflectedHeaderFields.
-func copyRequest(r *http.Request) (*http.Request, error) {
-	u, err := url.Parse(forwardURL)
-	if err != nil {
-		return nil, err
-	}
-	// Append the requested path to the path in forwardURL, so that
-	// forwardURL can be something like "https://example.com/reflect".
-	u.Path = pathJoin(u.Path, r.URL.Path)
-	c, err := http.NewRequest(r.Method, u.String(), r.Body)
-	if err != nil {
-		return nil, err
-	}
-	for _, key := range reflectedHeaderFields {
-		values, ok := r.Header[key]
-		if ok {
-			for _, value := range values {
-				c.Header.Add(key, value)
-			}
-		}
-	}
-	return c, nil
-}
-
-func handler(w http.ResponseWriter, r *http.Request) {
-	ctx = appengine.NewContext(r)
-	fr, err := copyRequest(r)
-	if err != nil {
-		log.Errorf(ctx, "copyRequest: %s", err)
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-	if urlFetchTimeout != 0 {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithTimeout(ctx, urlFetchTimeout)
-		defer cancel()
-	}
-	// Use urlfetch.Transport directly instead of urlfetch.Client because we
-	// want only a single HTTP transaction, not following redirects.
-	transport := urlfetch.Transport{
-		Context: ctx,
-	}
-	resp, err := transport.RoundTrip(fr)
-	if err != nil {
-		log.Errorf(ctx, "RoundTrip: %s", err)
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-	defer resp.Body.Close()
-	for _, key := range reflectedHeaderFields {
-		values, ok := resp.Header[key]
-		if ok {
-			for _, value := range values {
-				w.Header().Add(key, value)
-			}
-		}
-	}
-	w.WriteHeader(resp.StatusCode)
-	n, err := io.Copy(w, resp.Body)
-	if err != nil {
-		log.Errorf(ctx, "io.Copy after %d bytes: %s", n, err)
-	}
-}
-
-func init() {
-	http.HandleFunc("/", handler)
-}