add mobile putaway web server with camera/upload capture

server.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	_ "embed"
+	"encoding/json"
+	"image"
+	"log/slog"
+	"net/http"
+	"sync"
+	"time"
+
+	"spoolweight/claude"
+)
+
+//go:embed index.html
+var indexHTML []byte
+
+// serve runs the mobile putaway web server. Requests are serialized because the
+// shared spooldb browser session is single-threaded.
+func serve(addr string, auth claude.Auth, sp *spoolSync, dryRun bool) error {
+	var mu sync.Mutex
+
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/" {
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		w.Write(indexHTML)
+	})
+
+	mux.HandleFunc("POST /process", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+
+		if err := r.ParseMultipartForm(64 << 20); err != nil {
+			writeJSON(w, result{Error: "upload too large or malformed"})
+			return
+		}
+		file, hdr, err := r.FormFile("photo")
+		if err != nil {
+			writeJSON(w, result{Error: "no photo in request"})
+			return
+		}
+		defer file.Close()
+
+		img, _, err := image.Decode(file)
+		if err != nil {
+			writeJSON(w, result{Image: hdr.Filename, Error: "could not read image (try choosing from your library)"})
+			return
+		}
+
+		start := time.Now()
+		mu.Lock()
+		res := processImg(img, hdr.Filename, auth, sp, dryRun)
+		mu.Unlock()
+		slog.Info("processed upload", "file", hdr.Filename, "spool", res.SpoolID, "dur", time.Since(start))
+
+		writeJSON(w, res)
+	})
+
+	slog.Info("putaway server listening", "addr", addr, "dry_run", dryRun)
+	return http.ListenAndServe(addr, mux)
+}
+
+func writeJSON(w http.ResponseWriter, v any) {
+	json.NewEncoder(w).Encode(v)
+}