correctly support proxy Authorization spec

.gitignore

@@ -1,3 +1,5 @@
 fly.toml
 
 smokescreen
+
+.env

Dockerfile

@@ -5,7 +5,9 @@ COPY . .
 
 RUN go build .
 
-FROM ubuntu:18.04
+FROM ubuntu:22.04
+
+RUN apt-get update && apt-get install -y netcat && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder /go/src/app/smokescreen /usr/local/bin/smokescreen
 COPY acl.yaml /etc/smokescreen/acl.yaml

docker-compose.yml

@@ -0,0 +1,40 @@
+version: "3.8"
+
+services:
+  smokescreen:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: smokescreen
+    env_file:
+      - .env
+    ports:
+      - "4750:4750"
+    volumes:
+      - ./acl.yaml:/etc/smokescreen/acl.yaml:ro
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "nc", "-z", "localhost", "4750"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 5s
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "3"
+    networks:
+      - proxy-network
+    deploy:
+      resources:
+        limits:
+          cpus: "1"
+          memory: 1G
+        reservations:
+          cpus: "0.25"
+          memory: 256M
+
+networks:
+  proxy-network:
+    driver: bridge

go.mod

@@ -2,4 +2,14 @@ module github.com/superfly/smokescreen
 
 go 1.15
 
-require github.com/stripe/smokescreen v0.0.2
+require (
+	github.com/DataDog/datadog-go v4.8.3+incompatible // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/armon/go-proxyproto v0.0.0-20210323213023-7e956b284f0a // indirect
+	github.com/rs/xid v1.5.0 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/stripe/goproxy v0.0.0-20230801191332-fabc3ecb7251 // indirect
+	github.com/stripe/smokescreen v0.0.4
+	golang.org/x/tools v0.13.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

go.sum

@@ -1,54 +1,100 @@
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/urfave/cli.v1 v1.20.0 h1:NdAVW6RYxDif9DhDHaAortIu956m2c0v+09AZBPTbE0=
 gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
-gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -26,7 +26,9 @@ func main() {
 		fmt.Println("missing environment variable: PROXY_PASSWORD")
 		os.Exit(1)
 	}
-
+	conf.RejectResponseHandler = func(resp *http.Response) {
+		resp.Header.Set("Proxy-Authenticate", "Basic realm=\"smokescreen\"")
+	}
 	conf.RoleFromRequest = func(request *http.Request) (string, error) {
 		fail := func(err string) (string, error) { return "", fmt.Errorf(err) }