From 5b7113905ecdb1646ead78a05b1e10c5ebee9b6f Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p@janouch.name>
Date: Mon, 15 Apr 2019 03:16:19 +0200
Subject: sklad: support running under a prefix

---
 cmd/sklad/base.tmpl      |  8 +++----
 cmd/sklad/container.tmpl | 20 ++++++++--------
 cmd/sklad/main.go        | 59 ++++++++++++++++++++++++++++--------------------
 cmd/sklad/search.tmpl    |  6 ++---
 cmd/sklad/series.tmpl    |  8 +++----
 cmd/sklad/session.go     |  2 +-
 6 files changed, 57 insertions(+), 46 deletions(-)

diff --git a/cmd/sklad/base.tmpl b/cmd/sklad/base.tmpl
index d92a818..956bfa4 100644
--- a/cmd/sklad/base.tmpl
+++ b/cmd/sklad/base.tmpl
@@ -49,14 +49,14 @@
 	<h1>sklad</h1>
 
 {{ block "HeaderControls" . }}
-	<a href=/>Obaly</a>
-	<a href=/series>Řady</a>
+	<a href="container">Obaly</a>
+	<a href="series">Řady</a>
 
-	<form method=get action=/search>
+	<form method=get action="search">
 	<input type=text name=q autofocus><input type=submit value="Hledat">
 	</form>
 
-	<form method=post action=/logout>
+	<form method=post action="logout">
 	<input type=submit value="Odhlásit">
 	</form>
 {{ end }}
diff --git a/cmd/sklad/container.tmpl b/cmd/sklad/container.tmpl
index 3300a1f..147e124 100644
--- a/cmd/sklad/container.tmpl
+++ b/cmd/sklad/container.tmpl
@@ -24,18 +24,18 @@
 <header>
 	<h2>{{ .Container.Id }}
 {{ range .Container.Path }}
-	<small>&laquo; <a href="/?id={{ . }}">{{ . }}</a></small>
+	<small>&laquo; <a href="container?id={{ . }}">{{ . }}</a></small>
 {{ end }}
 	</h2>
-	<form method=post action="/label?id={{ .Container.Id }}">
+	<form method=post action="label?id={{ .Container.Id }}">
 	<input type=submit value="Vytisknout štítek">
 	</form>
-	<form method=post action="/?id={{ .Container.Id }}&amp;remove">
+	<form method=post action="container?id={{ .Container.Id }}&amp;remove">
 	<input type=submit value="Odstranit">
 	</form>
 </header>
 
-<form method=post action="/?id={{ .Container.Id }}">
+<form method=post action="container?id={{ .Container.Id }}">
 <textarea name=description rows=5>
 {{ .Container.Description }}
 </textarea>
@@ -66,7 +66,7 @@
 <header>
 	<h2>Nový obal</h2>
 </header>
-<form method=post action="/">
+<form method=post action="container">
 <textarea name=description rows=5
 	placeholder="Popis obalu nebo jeho obsahu"></textarea>
 <footer>
@@ -94,15 +94,15 @@
 {{ range .Children }}
 <section>
 <header>
-	<h3><a href="/?id={{ .Id }}">{{ .Id }}</a>
+	<h3><a href="container?id={{ .Id }}">{{ .Id }}</a>
 {{ range .Path }}
-	<small>&laquo; <a href="/?id={{ . }}">{{ . }}</a></small>
+	<small>&laquo; <a href="container?id={{ . }}">{{ . }}</a></small>
 {{ end }}
 	</h3>
-	<form method=post action="/label?id={{ .Id }}">
+	<form method=post action="label?id={{ .Id }}">
 	<input type=submit value="Vytisknout štítek">
 	</form>
-	<form method=post action="/?id={{ .Id }}&amp;remove">
+	<form method=post action="container?id={{ .Id }}&amp;remove">
 	<input type=submit value="Odstranit">
 	</form>
 </header>
@@ -112,7 +112,7 @@
 {{ if .Children }}
 <p>
 {{ range .Children }}
-<a href="/?id={{ .Id }}">{{ .Id }}</a>
+<a href="container?id={{ .Id }}">{{ .Id }}</a>
 {{ end }}
 {{ end }}
 </section>
diff --git a/cmd/sklad/main.go b/cmd/sklad/main.go
index 5dc2174..5b68e00 100644
--- a/cmd/sklad/main.go
+++ b/cmd/sklad/main.go
@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"path"
 	"path/filepath"
 	"time"
 
@@ -25,24 +26,10 @@ func executeTemplate(name string, w io.Writer, data interface{}) {
 	}
 }
 
-func wrap(inner func(http.ResponseWriter, *http.Request)) func(
-	http.ResponseWriter, *http.Request) {
-	return func(w http.ResponseWriter, r *http.Request) {
-		if err := r.ParseForm(); err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
-		}
-		if r.Method == http.MethodGet {
-			w.Header().Set("Cache-Control", "no-store")
-		}
-		inner(w, r)
-	}
-}
-
 func handleLogin(w http.ResponseWriter, r *http.Request) {
 	redirect := r.FormValue("redirect")
 	if redirect == "" {
-		redirect = "/"
+		redirect = "container"
 	}
 
 	session := sessionGet(w, r)
@@ -81,7 +68,7 @@ func handleLogout(w http.ResponseWriter, r *http.Request) {
 
 	session := r.Context().Value(sessionContextKey{}).(*Session)
 	session.LoggedIn = false
-	http.Redirect(w, r, "/", http.StatusSeeOther)
+	http.Redirect(w, r, "login", http.StatusSeeOther)
 }
 
 func handleContainerPost(r *http.Request) error {
@@ -315,6 +302,37 @@ func handleLabel(w http.ResponseWriter, r *http.Request) {
 	executeTemplate("label.tmpl", w, &params)
 }
 
+func handle(w http.ResponseWriter, r *http.Request) {
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if r.Method == http.MethodGet {
+		w.Header().Set("Cache-Control", "no-store")
+	}
+
+	switch _, base := path.Split(r.URL.Path); base {
+	case "login":
+		handleLogin(w, r)
+	case "logout":
+		sessionWrap(handleLogout)(w, r)
+
+	case "container":
+		sessionWrap(handleContainer)(w, r)
+	case "series":
+		sessionWrap(handleSeries)(w, r)
+	case "search":
+		sessionWrap(handleSearch)(w, r)
+	case "label":
+		sessionWrap(handleLabel)(w, r)
+
+	case "":
+		http.Redirect(w, r, "container", http.StatusSeeOther)
+	default:
+		http.NotFound(w, r)
+	}
+}
+
 func main() {
 	// Randomize the RNG for session string generation.
 	rand.Seed(time.Now().UnixNano())
@@ -340,13 +358,6 @@ func main() {
 		templates[name] = template.Must(template.ParseFiles("base.tmpl", name))
 	}
 
-	http.HandleFunc("/login", wrap(handleLogin))
-	http.HandleFunc("/logout", sessionWrap(wrap(handleLogout)))
-
-	http.HandleFunc("/", sessionWrap(wrap(handleContainer)))
-	http.HandleFunc("/series", sessionWrap(wrap(handleSeries)))
-	http.HandleFunc("/search", sessionWrap(wrap(handleSearch)))
-	http.HandleFunc("/label", sessionWrap(wrap(handleLabel)))
-
+	http.HandleFunc("/", handle)
 	log.Fatalln(http.ListenAndServe(address, nil))
 }
diff --git a/cmd/sklad/search.tmpl b/cmd/sklad/search.tmpl
index cf704cf..9fef455 100644
--- a/cmd/sklad/search.tmpl
+++ b/cmd/sklad/search.tmpl
@@ -8,7 +8,7 @@
 {{ range .Series }}
 <section>
 <header>
-	<h3><a href="/series?prefix={{ .Prefix }}">{{ .Prefix }}</a></h3>
+	<h3><a href="series?prefix={{ .Prefix }}">{{ .Prefix }}</a></h3>
 	<p>{{ .Description }}
 </header>
 </section>
@@ -21,9 +21,9 @@
 {{ range .Containers }}
 <section>
 <header>
-	<h3><a href="/?id={{ .Id }}">{{ .Id }}</a>
+	<h3><a href="container?id={{ .Id }}">{{ .Id }}</a>
 {{ range .Path }}
-	<small>&laquo; <a href="/?id={{ . }}">{{ . }}</a></small>
+	<small>&laquo; <a href="container?id={{ . }}">{{ . }}</a></small>
 {{ end }}
 	</h3>
 </header>
diff --git a/cmd/sklad/series.tmpl b/cmd/sklad/series.tmpl
index 0e31e0f..fbc0e91 100644
--- a/cmd/sklad/series.tmpl
+++ b/cmd/sklad/series.tmpl
@@ -24,7 +24,7 @@
 {{ else }}
 
 <section>
-<form method=post action="/series">
+<form method=post action="series">
 <header>
 	<h3>Nová řada</h3>
 	<input type=text name=prefix placeholder="Prefix řady">
@@ -38,7 +38,7 @@
 {{ range .AllSeries }}
 <section>
 <header>
-	<h3><a href="/series?prefix={{ .Prefix }}">{{ .Prefix }}</a></h3>
+	<h3><a href="series?prefix={{ .Prefix }}">{{ .Prefix }}</a></h3>
 {{ with $count := len .Containers }}
 {{ if eq $count 1 }}
 	<p>{{ $count }} obal
@@ -48,11 +48,11 @@
 	<p>{{ $count }} obalů
 {{ end }}
 {{ end }}
-	<form method=post action="/series?prefix={{ .Prefix }}">
+	<form method=post action="series?prefix={{ .Prefix }}">
 	<input type=text name=description value="{{ .Description }}"
 	><input type=submit value="Uložit">
 	</form>
-	<form method=post action="/series?prefix={{ .Prefix }}&amp;remove">
+	<form method=post action="series?prefix={{ .Prefix }}&amp;remove">
 	<input type=submit value="Odstranit">
 	</form>
 </header>
diff --git a/cmd/sklad/session.go b/cmd/sklad/session.go
index 02fe0b0..23681a2 100644
--- a/cmd/sklad/session.go
+++ b/cmd/sklad/session.go
@@ -50,7 +50,7 @@ func sessionWrap(inner func(http.ResponseWriter, *http.Request)) func(
 		// though I don't expect any substantial improvements of anything.
 		w.Header().Set("Cache-Control", "no-store")
 
-		redirect := "/login"
+		redirect := "login"
 		if r.RequestURI != "/" && r.Method == http.MethodGet {
 			redirect += "?redirect=" + url.QueryEscape(r.RequestURI)
 		}
-- 
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