From cdc62c50c5afd6904dea41fed38c464e716c9327 Mon Sep 17 00:00:00 2001
From: Jan-Lukas Else <mail@jlelse.de>
Date: Sat, 30 Oct 2021 10:54:41 +0200
Subject: [PATCH] Initial version

---
 .drone.yml | 21 ++++++++++++++++++++
 Dockerfile |  9 +++++++++
 go.mod     |  3 +++
 main.go    | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 91 insertions(+)
 create mode 100644 .drone.yml
 create mode 100644 Dockerfile
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..5cc4136
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,21 @@
+kind: pipeline
+name: default
+type: docker
+
+steps:
+  - name: publish
+    image: plugins/docker
+    settings:
+      username: nologin
+      password:
+        from_secret: docker_password
+      repo: rg.fr-par.scw.cloud/jlelse/proxyexposer
+      registry: rg.fr-par.scw.cloud/jlelse
+      tags: latest
+      mirror: https://mirror.gcr.io
+
+trigger:
+  branch:
+    - master
+  event:
+    - push
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..ea6f4ad
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,9 @@
+FROM golang:1.17-alpine3.14 as build
+WORKDIR /app
+ADD *.go go.mod /app/
+RUN go build -ldflags '-w -s' -o proxyexposer
+
+FROM alpine:3.14
+WORKDIR /app
+CMD ["proxyexposer"]
+COPY --from=build /app/proxyexposer /bin/
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..6753eb8
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.jlel.se/jlelse/ProxyExposer
+
+go 1.17
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..a33d6ff
--- /dev/null
+++ b/main.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"os"
+	"strconv"
+)
+
+func main() {
+
+	proxy := os.Getenv("PE_PROXY")
+	if proxy == "" {
+		log.Fatal("PE_PROXY not specified")
+		return
+	}
+	proxyUrl, err := url.Parse(proxy)
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+
+	upstream := os.Getenv("PE_UPSTREAM")
+	if upstream == "" {
+		log.Fatal("PE_UPSTREAM not specified")
+		return
+	}
+	upstreamUrl, err := url.Parse(upstream)
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+
+	portString := os.Getenv("PE_PORT")
+	if portString == "" {
+		log.Fatal("PE_PORT not specified")
+		return
+	}
+
+	port, err := strconv.Atoi(portString)
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+
+	rp := httputil.NewSingleHostReverseProxy(upstreamUrl)
+	rp.Transport = &http.Transport{
+		Proxy: http.ProxyURL(proxyUrl),
+	}
+	err = http.ListenAndServe(":"+strconv.Itoa(port), rp)
+	if err != nil {
+		log.Fatal(err.Error())
+		return
+	}
+
+}