From 1c153a8e8ea709cfc89eda810c41b5d2c9fa8472 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Sat, 9 Dec 2023 05:37:40 +0100
Subject: Make some HTTP handlers work

---
 main.go | 51 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 44 insertions(+), 7 deletions(-)

(limited to 'main.go')

diff --git a/main.go b/main.go
index 2a46b21..7d6d311 100644
--- a/main.go
+++ b/main.go
@@ -15,6 +15,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"time"
 
 	_ "github.com/mattn/go-sqlite3"
@@ -87,6 +88,35 @@ func cmdInit(args []string) error {
 	return nil
 }
 
+var hashRE = regexp.MustCompile(`^/.*?/([0-9a-f]{40})$`)
+var staticHandler http.Handler
+
+func handleRequest(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path != "/" {
+		staticHandler.ServeHTTP(w, r)
+		return
+	}
+
+	// TODO: Return something.
+	http.NotFound(w, r)
+}
+
+func handleImages(w http.ResponseWriter, r *http.Request) {
+	if m := hashRE.FindStringSubmatch(r.URL.Path); m == nil {
+		http.NotFound(w, r)
+	} else {
+		http.ServeFile(w, r, imagePath(m[1]))
+	}
+}
+
+func handleThumbs(w http.ResponseWriter, r *http.Request) {
+	if m := hashRE.FindStringSubmatch(r.URL.Path); m == nil {
+		http.NotFound(w, r)
+	} else {
+		http.ServeFile(w, r, thumbPath(m[1]))
+	}
+}
+
 // cmdRun runs a web UI against GD on ADDRESS.
 func cmdRun(args []string) error {
 	if len(args) != 2 {
@@ -98,13 +128,10 @@ func cmdRun(args []string) error {
 
 	address := args[1]
 
-	http.Handle("/", http.FileServer(http.Dir("public")))
-	// TODO: These subdirectories should be indirect
-	// (skip the hash subpath, don't require the .webp suffix).
-	http.Handle("/images",
-		http.FileServer(http.Dir(filepath.Join(gd, "images"))))
-	http.Handle("/thumbs",
-		http.FileServer(http.Dir(filepath.Join(gd, "thumbs"))))
+	staticHandler = http.FileServer(http.Dir("public"))
+	http.HandleFunc("/", handleRequest)
+	http.HandleFunc("/images/", handleImages)
+	http.HandleFunc("/thumbs/", handleThumbs)
 
 	host, port, err := net.SplitHostPort(address)
 	if err != nil {
@@ -258,6 +285,16 @@ func makeThumbnail(pathImage, pathThumb string) (int, int, error) {
 		return 0, 0, err
 	}
 
+	// Create a normalized thumbnail. Since we don't particularly need
+	// any complex processing, such as surrounding of metadata,
+	// simply push it through ImageMagick.
+	//
+	//  - http://www.ericbrasseur.org/gamma.html
+	//  - https://www.imagemagick.org/Usage/thumbnails/
+	//  - https://imagemagick.org/script/command-line-options.php#layers
+	//
+	// TODO: See if we can optimize resulting WebP animations.
+	// (Do -layers optimize* apply to this format at all?)
 	cmd := exec.Command("convert", pathImage, "-coalesce", "-colorspace", "RGB",
 		"-auto-orient", "-strip", "-resize", "256x128>", "-colorspace", "sRGB",
 		"-format", "%w %h", "+write", "info:", pathThumb)
-- 
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