initial version with thumbnailing

Dockerfile

@@ -0,0 +1,11 @@
+FROM golang:1-bullseye AS build
+RUN apt-get update
+RUN apt-get -y --no-install-recommends install libavutil-dev libswscale-dev libavformat-dev libgraphicsmagick-dev
+WORKDIR /src
+COPY go.* ./
+COPY pkg ./pkg/
+COPY cmd ./cmd/
+COPY web /web
+RUN go get ./...
+RUN go install ./...
+ENTRYPOINT ["/go/bin/simpleauth"]

build.sh

@@ -0,0 +1,7 @@
+#! /bin/sh
+
+set -e
+
+tag=git.woozle.org/neale/webfs:latest
+
+docker buildx build --push --tag $tag $(dirname $0)/.

cmd/webfs/main.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"flag"
+	"fmt"
+	"github.com/bakape/thumbnailer"
+	"golang.org/x/net/webdav"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strconv"
+)
+
+type Handler struct {
+	webdav.Handler
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	width, _ := strconv.Atoi(req.FormValue("w"))
+	height, _ := strconv.Atoi(req.FormValue("h"))
+
+	if (width > 0) || (height > 0) {
+		h.ServeThumbnail(w, req, uint(width), uint(height))
+		return
+	}
+
+	h.Handler.ServeHTTP(w, req)
+}
+
+func (h *Handler) ServeThumbnail(w http.ResponseWriter, req *http.Request, width uint, height uint) {
+	srcPath := path.Clean(req.URL.Path)
+	srcFile, err := h.FileSystem.OpenFile(context.Background(), srcPath, os.O_RDONLY, 0664)
+	if err != nil {
+		http.NotFound(w, req)
+		return
+	}
+	defer srcFile.Close()
+	srcFileInfo, err := srcFile.Stat()
+	if err != nil {
+		http.NotFound(w, req)
+		return
+	}
+
+	var opts thumbnailer.Options
+	opts.ThumbDims.Width = width
+	opts.ThumbDims.Height = height
+	_, thumb, err := thumbnailer.Process(srcFile, opts)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	ext := "jpeg"
+	if thumb.IsPNG {
+		ext = "png"
+	}
+	fileName := filepath.Base(srcPath)
+	thumbFileName := fmt.Sprintf("%s.thumb.%s", fileName, ext)
+	thumbRs := bytes.NewReader(thumb.Image.Data)
+	http.ServeContent(w, req, thumbFileName, srcFileInfo.ModTime(), thumbRs)
+}
+
+func main() {
+	address := flag.String("a", "localhost:8080", "Address to listen to.")
+	flag.Parse()
+
+	handler := &Handler{}
+	handler.FileSystem = webdav.Dir(".")
+	handler.LockSystem = webdav.NewMemLS()
+
+	log.Println("Listening on", *address)
+	http.ListenAndServe(*address, handler)
+}

go.mod

@@ -0,0 +1,8 @@
+module woozle.org/neale/webfs
+
+go 1.15
+
+require (
+	github.com/bakape/thumbnailer v1.0.0
+	golang.org/x/net v0.6.0
+)

go.sum

@@ -0,0 +1,30 @@
+github.com/bakape/thumbnailer v1.0.0 h1:fmaLCJ6sJ5wCAUmB3hhzgFAZ5G3cpueo3olI9N0ox3E=
+github.com/bakape/thumbnailer v1.0.0/go.mod h1:PVB2nXXJHD4KAUWn9HaNKtWeDeAb9BFQ7oDOAdZCKUM=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
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