From f8126e8a3779842d32f2763df9fe13f741cf1384 Mon Sep 17 00:00:00 2001
From: Leon Mika <lmika@lmika.org>
Date: Sun, 6 Aug 2023 22:06:50 +1000
Subject: [PATCH] Initial commit

---
 Dockerfile | 11 +++++++++
 go.mod     |  5 +++++
 go.sum     |  2 ++
 main.go    | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 83 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 main.go

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..935c8c3
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,11 @@
+FROM golang:1.20-alpine
+
+WORKDIR /usr/src/app
+
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+RUN go build -v -o /usr/local/bin/app ./...
+
+CMD ["app"]
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..845bc78
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/lmika/rt-redirect
+
+go 1.20
+
+require github.com/gorilla/mux v1.8.0 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..5350288
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
+github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..70f92c7
--- /dev/null
+++ b/main.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"github.com/gorilla/mux"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+const (
+	targetURL   = "https://workingset.net"
+	readTimeout = 30 * time.Second
+)
+
+func main() {
+	port, hasPort := os.LookupEnv("PORT")
+	if !hasPort {
+		port = "8080"
+	}
+
+	routes := []struct {
+		From string
+		To   string
+	}{
+		{From: "/2022/04/a-case-for-mocking-in-unit-tests", To: "/2022/04/12/a-case-for.html"},
+		{From: "/2021/06/parametrising-your-bdd-tests-in-go", To: "/2021/06/23/parametrising-your-bdd.html"},
+		{From: "/2021/03/communication-among-stimulus-controllers-part-2", To: "/2021/02/17/communication-among-stimulus.html"},
+		{From: "/2021/02/communication-among-stimulus-controllers-part-1", To: "/2021/02/17/communication-among-stimulus.html"},
+		{From: "/2021/01/a-simple-source-ip-address-filter-in-go", To: "/2021/01/20/a-simple-source.html"},
+		{From: "/2021/01/building-sets-from-maps", To: "/2021/01/09/building-sets-from.html"},
+		{From: "/2020/12/test-helpers-and-test-packages-in-go", To: "/2020/12/23/test-helpers-and.html"},
+		{From: "/2020/12/a-tour-of-domain-records-for-email", To: "/2020/12/18/a-tour-of.html"},
+		{From: "/2020/12/dealing-with-errors-in-go", To: "/2020/12/16/dealing-with-errors.html"},
+		{From: "/2020/12/building-and-serving-go-wasm-projects", To: "/2020/12/12/building-and-serving.html"},
+		{From: "/2020/12/a-brief-look-at-stimulus", To: "/2020/12/08/a-brief-look.html"},
+		{From: "/2020/12/setting-go-variables-during-build", To: "/2020/12/04/setting-go-variables.html"},
+		{From: "/2020/12/posts-only-rss-feed-in-hugo", To: "/2020/12/03/posts-only-rss.html"},
+		{From: "/posts/index.xml", To: "/feed.xml"},
+	}
+
+	r := mux.NewRouter()
+	for _, route := range routes {
+		r.Handle(route.From+"/", redirectTo(route.To))
+		r.Handle(route.From, redirectTo(route.To))
+	}
+	r.Handle("/", redirectTo("/"))
+
+	svr := http.Server{
+		Addr:              fmt.Sprintf(":%v", port),
+		Handler:           r,
+		ReadTimeout:       readTimeout,
+		ReadHeaderTimeout: readTimeout,
+	}
+	if err := svr.ListenAndServe(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func redirectTo(url string) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Redirect(w, r, targetURL+url, http.StatusPermanentRedirect)
+	})
+}