doc: update changelog for v1.5.1

Issues are now tracked at git.ivysaur.me.

.gitignore

@@ -1,6 +1,5 @@
-syntax: glob
-
 cmd/contented/contented
+cmd/contented-multi/contented-multi
 build/
 _dist/
 contented.db

.hgtags

@@ -1,11 +0,0 @@
-e2250a7fd29052ea767f18e1459cabea4cd7efd3 release-1.0.0
-b8975b9e75648a7c2a5003c67db92cf2216e01c0 release-1.0.1
-c7b699105bd166e7a01aa0e678d34624680bf81e release-1.1.0
-c7b699105bd166e7a01aa0e678d34624680bf81e release-1.1.0
-0000000000000000000000000000000000000000 release-1.1.0
-0000000000000000000000000000000000000000 release-1.1.0
-cfb1e028fd0627614aa01184893f9f29f20a347e release-1.1.0
-cfb1e028fd0627614aa01184893f9f29f20a347e release-1.1.0
-0000000000000000000000000000000000000000 release-1.1.0
-0000000000000000000000000000000000000000 release-1.1.0
-98da2ebf0d50dffe8b625457a639bc2f15519714 release-1.1.0

Makefile

@@ -2,7 +2,7 @@
 # Makefile for contented
 #
 
-VERSION:=1.2.0
+VERSION:=1.2.2
 
 SOURCES:=Makefile \
 	static \
@@ -21,22 +21,12 @@ all: build/linux64/contented build/win32/contented.exe
 
 dist: \
 	_dist/contented-$(VERSION)-linux64.tar.gz \
-	_dist/contented-$(VERSION)-win32.7z \
 	_dist/contented-$(VERSION)-src.zip
 
 clean:
-	if [ -f ./staticResources.go ] ; then rm ./staticResources.go ; fi
 	if [ -d ./build ] ; then rm -r ./build ; fi
 	if [ -f ./contented ] ; then rm ./contented ; fi
 
-#
-# Generated files
-#
-
-staticResources.go: static/ static/*
-	go-bindata -o staticResources.go -prefix static -pkg contented static
-	
-
 #
 # Release artefacts
 #
@@ -48,26 +38,6 @@ build/linux64/contented: $(SOURCES) staticResources.go
 		go build $(GOFLAGS) -o ../../build/linux64/contented \
 	)
 	
-build/win32/contented.exe: $(SOURCES) staticResources.go
-	mkdir -p build/win32
-	(cd cmd/contented ; \
-		PATH=/usr/lib/mxe/usr/bin:$(PATH) CC=i686-w64-mingw32.static-gcc \
-		CGO_ENABLED=1 GOOS=windows GOARCH=386 \
-		go build $(GOFLAGS) -o ../../build/win32/contented.exe \
-	)
-
 _dist/contented-$(VERSION)-linux64.tar.gz: build/linux64/contented
 	mkdir -p _dist
 	tar caf _dist/contented-$(VERSION)-linux64.tar.gz -C build/linux64 contented --owner=0 --group=0
-	
-_dist/contented-$(VERSION)-win32.7z: build/win32/contented.exe
-	mkdir -p _dist
-	( cd build/win32 ; \
-		if [ -f dist.7z ] ; then rm dist.7z ; fi ; \
-		7z a dist.7z contented.exe ; \
-		mv dist.7z ../../_dist/contented-$(VERSION)-win32.7z \
-	)
-	
-_dist/contented-$(VERSION)-src.zip: $(SOURCES)
-	 hg archive --type=zip _dist/contented-$(VERSION)-src.zip
-	

Metadata.go

@@ -3,13 +3,14 @@ package contented
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"log"
 	"net/http"
 	"os"
 	"time"
 
-	"github.com/boltdb/bolt"
 	"github.com/speps/go-hashids"
+	bolt "go.etcd.io/bbolt"
 )
 
 const (
@@ -47,7 +48,7 @@ func idToString(v uint64) string {
 	hd := hashids.NewData()
 	hd.Salt = hashIdSalt
 	hd.MinLength = hashIdMinLength
-	h, _ := hashids.NewWithData(hd)
+	h := hashids.NewWithData(hd)
 	s, _ := h.EncodeInt64([]int64{int64(v)})
 	return s
 }
@@ -62,9 +63,17 @@ func (this *Server) AddMetadata(m Metadata) (string, error) {
 
 	err = this.db.Update(func(tx *bolt.Tx) error {
 		b := tx.Bucket(this.metadataBucket)
-		seq, _ := b.NextSequence() // cannot fail
+		seq, err := b.NextSequence()
+		if err != nil {
+			return fmt.Errorf("NextSequence: %w", err)
+		}
 		shortRef = idToString(seq)
-		return tx.Bucket(this.metadataBucket).Put([]byte(shortRef), jb)
+
+		if b.Get([]byte(shortRef)) != nil {
+			return fmt.Errorf("Next bucket sequence %d creates colliding ID %s", seq, shortRef)
+		}
+
+		return b.Put([]byte(shortRef), jb)
 	})
 	if err != nil {
 		return "", err

README.md

@@ -0,0 +1,162 @@
+# contented
+
+[![](doc/image1.thumb.png)](doc/image1.png)
+
+A file / image / paste upload server with a focus on embedding.
+
+You can use contented as a standalone upload server, or you can use the SDK to embed its upload widget into another website.
+
+The name is a pun on "content" and the -d suffix for server daemons.
+
+## Features
+
+- Use local disk or S3-backed storage
+- Drag and drop upload
+- Multiple files upload
+- Pastebin upload
+- Custom drawing upload ([via drawingboard.js](https://github.com/Leimi/drawingboard.js))
+- Ctrl-V upload
+- Galleries and nested galleries
+- SDK-oriented design for embedding, including CORS support
+- Mobile friendly HTML interface
+- Preserves uploaded filename and content-type metadata
+- Hash verification (SHA512/256)
+- Detect duplicate upload content and reuse storage
+- Options to limit the upload filesize, upload bandwidth, and maximum source filesize for thumbnailing
+- Short URLs (using [Hashids](http://hashids.org) algorithm)
+- Image thumbnailing
+- Optional multi-tenant binary (`contented-multi`)
+
+## Usage (Server)
+
+```
+Usage of contented:
+  -concurrentthumbs int
+        Simultaneous thumbnail generation (default 16)
+  -data string
+        Directory for stored content (default ".")
+  -db string
+        Path for metadata database (default "contented.db")
+  -diskFilesWorldReadable
+        Save files as 0644 instead of 0600
+  -enableHomepage
+        Enable homepage (disable for embedded use only) (default true)
+  -enableUpload
+        Enable uploads (disable for read-only mode) (default true)
+  -listen string
+        IP/Port to bind server (default "127.0.0.1:80")
+  -max int
+        Maximum size of uploaded files in MiB (set zero for unlimited) (default 8)
+  -speed int
+        Maximum upload speed in bytes/sec (set zero for unlimited)
+  -title string
+        Title used in web interface (default "contented")
+  -trustXForwardedFor
+        Trust X-Forwarded-For reverse proxy headers
+```
+
+If you are hosting behind a reverse proxy, remember to set its post body size parameter appropriately (e.g. `client_max_body_size` for nginx).
+
+## Usage (HTTP)
+
+The server responds on the following URLs:
+
+URL                  |Method |Description
+---------------------|-------|---
+`/get/{ID}`          |`GET`  |Download item content
+`/p/{ID}`            |`GET`  |Preview item content (HTML)
+`/p/{ID}-{ID}-...`   |`GET`  |Preview multiple item content (HTML)
+`/info/{ID}`         |`GET`  |Get item content metadata (JSON)
+`/thumb/{Type}/{ID}` |`GET`  |Get item thumbnail image (JPEG). "Type" should match `[sbtmlh]`.
+`/about`             |`GET`  |Get server metadata (JSON)
+
+## Usage (Embedding for web)
+
+Your webpage should load the SDK from the contented server, then call the `contented.init` function to display the upload widget over the top of an existing DOM element:
+
+```html
+<script type="text/javascript" src="SERVER_ADDR/sdk.js"></script>
+contented.init("#target");
+```
+
+You can optionally supply additional ordered parameters to `contented.init`:
+
+1. A callback, that will be passed an array of file IDs of any uploaded items
+2. A callback, that will be called if the SDK widget is closed
+
+## Changelog
+
+2023-05-20: 1.5.1
+- Improve support for albums with no images, and for albums with missing interior images
+
+2023-05-19: 1.5.0
+- Feature: Support S3-backed storage
+- Feature: New `contented-multi` binary to host multiple server configurations from a single process
+- Enhancement: Better client-side caching for thumbnails
+- Option to cap source filesize for thumbnailing (default 20MiB)
+
+2023-05-17: 1.4.0
+- BREAKING: Remove support for some old web browsers (require jQuery 3, ES6 template literals, Promises, Canvas.toBlob)
+- Feature: Initial album support with custom titles
+- Feature: Support readonly mode
+- Enhancement: Use lazy-loading for large image galleries
+- Enhancement: Better tab titles on preview pages
+- Fix an issue with continuing server-side thumbnailing work even if the http client has gone away
+- Fix an issue with not warning on colliding hashIDs
+- Internal: Refactor the SDK's initialization phase
+- Internal: Update bolt library dependency
+
+2020-07-25: 1.3.1
+- Fix an issue with dependencies causing failure to compile in Modules mode
+
+2020-07-25: 1.3.0
+- Feature: Option to limit concurrent thumbnail generation
+- Enhancement: Set charset=UTF-8 when serving user-submitted text/plain content
+- Fix an issue with large memory usage for multipart file uploads
+
+2018-06-09: 1.2.1
+- Feature: Add OpenGraph tags on preview pages, for rich metadata in chat applications
+- Update thumbnailing library to improve quality
+- Use dep for vendoring
+- [⬇️ contented-1.2.1-win32.7z](https://git.ivysaur.me/attachments/88dea4f7-e314-4325-a957-096dcf8cdecc) *(1.51 MiB)*
+- [⬇️ contented-1.2.1-src.zip](https://git.ivysaur.me/attachments/6fd2b963-3be4-48a6-a5bf-6f273bcaea24) *(1.49 MiB)*
+- [⬇️ contented-1.2.1-linux64.tar.gz](https://git.ivysaur.me/attachments/c536f764-0250-4d67-886a-4797946e1124) *(2.21 MiB)*
+
+2017-11-18: 1.2.0
+- Feature: Thumbnail support
+- Feature: File preview page
+- Feature: Album mode (via URL `/p/{file1}-{file2}-...`)
+- Feature: New `-diskFilesWorldReadable` option to save files with `0644` mode
+- [⬇️ contented-1.2.0-win32.7z](https://git.ivysaur.me/attachments/f3453b62-b2a7-4e77-9b04-44c99dec35ba) *(1.36 MiB)*
+- [⬇️ contented-1.2.0-src.zip](https://git.ivysaur.me/attachments/a6c1ecfb-fd6a-44b5-9dc8-aea7c439d1e6) *(178.94 KiB)*
+- [⬇️ contented-1.2.0-linux64.tar.gz](https://git.ivysaur.me/attachments/6234754b-af17-4a72-8b66-56a5db21c7c7) *(2.03 MiB)*
+
+2017-10-15: 1.1.0
+- Feature: Drawing mode
+- Feature: Ctrl+V image upload
+- Feature: Option to trust X-Forwarded-For headers when using a reverse proxy
+- Feature: Add `getDownloadURL`, `getInfoJSONURL`, `getPreviewURL` SDK methods
+- Feature: Option to disable uploading via the homepage
+- Feature: Add button to repeat when uploading from homepage
+- Enhancement: Automatically load library dependencies
+- Enhancement: Display homepage widget using the full screen size
+- Include drawingboard.js 0.4.6 (MIT license)
+- Fix a cosmetic issue with javascript console output
+- Fix a cosmetic issue with error messages if an upload failed
+- [⬇️ contented-1.1.0-win32.7z](https://git.ivysaur.me/attachments/bfb0a7fe-bf95-4d0e-933b-8137bc8071a4) *(1.11 MiB)*
+- [⬇️ contented-1.1.0-src.zip](https://git.ivysaur.me/attachments/67401341-724f-4ea2-b9c7-44d08ab9d38a) *(142.82 KiB)*
+- [⬇️ contented-1.1.0-linux64.tar.gz](https://git.ivysaur.me/attachments/a13752dd-5228-4830-b61d-0f7cc568b2ae) *(1.67 MiB)*
+
+2017-10-08: 1.0.1
+- Fix an issue with CORS preflight requests
+- Fix an issue with index URLs
+- [⬇️ contented-1.0.1-win32.7z](https://git.ivysaur.me/attachments/a873d510-da09-4797-95e9-ffcad690a77b) *(1.10 MiB)*
+- [⬇️ contented-1.0.1-src.zip](https://git.ivysaur.me/attachments/43ac17d6-b6f1-4da7-98e9-b8af6fb5551a) *(109.08 KiB)*
+- [⬇️ contented-1.0.1-linux64.tar.gz](https://git.ivysaur.me/attachments/34d74bed-db3f-4cef-a76f-266f0b9e6017) *(1.65 MiB)*
+
+2017-10-08: 1.0.0
+- Initial public release
+- Include jQuery 1.12.4 (MIT license)
+- [⬇️ contented-1.0.0-win32.7z](https://git.ivysaur.me/attachments/4ef132cf-dac8-4bcf-9da7-14ca1366e815) *(1.10 MiB)*
+- [⬇️ contented-1.0.0-src.zip](https://git.ivysaur.me/attachments/74d77b3f-557b-44bf-9645-7b3b25ab17c1) *(102.45 KiB)*
+- [⬇️ contented-1.0.0-linux64.tar.gz](https://git.ivysaur.me/attachments/1c28a913-686b-44cf-b63d-db22968a93b6) *(1.65 MiB)*

Server.go

@@ -1,8 +1,10 @@
 package contented
 
 import (
-	"bytes"
+	"embed"
 	"encoding/json"
+	"fmt"
+	"io/fs"
 	"log"
 	"net/http"
 	"os"
@@ -10,24 +12,52 @@ import (
 	"strings"
 	"time"
 
-	"github.com/boltdb/bolt"
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
 	"github.com/mxk/go-flowrate/flowrate"
+	bolt "go.etcd.io/bbolt"
 )
 
+//go:embed static
+var staticAssets embed.FS
+
 var SERVER_HEADER string = `contented/0.0.0-dev`
 
+const (
+	DEFAULT_MAX_CONCURRENT_THUMBS = 16
+	DEFAULT_MAX_THUMBSIZE         = 20 * 1024 * 1024 // 20 MiB
+
+	ALBUM_MIMETYPE = `contented/album`
+
+	STORAGE_LOCAL int = 0
+	STORAGE_S3    int = 1
+)
+
 type ServerPublicProperties struct {
 	AppTitle         string
 	MaxUploadBytes   int64
+	CanonicalBaseURL string
 }
 
 type ServerOptions struct {
+	StorageType   int // STORAGE_xx
 	DataDirectory string
+	DataS3Options struct {
+		Hostname  string
+		AccessKey string
+		SecretKey string
+		Bucket    string
+		Prefix    string
+	}
+
 	DBPath                 string
 	DiskFilesWorldReadable bool
 	BandwidthLimit         int64
 	TrustXForwardedFor     bool
 	EnableHomepage         bool
+	EnableUpload           bool
+	MaxConcurrentThumbs    int
+	MaxThumbSizeBytes      int64
 	ServerPublicProperties
 }
 
@@ -41,9 +71,12 @@ func (this *ServerOptions) FileMode() os.FileMode {
 
 type Server struct {
 	opts           ServerOptions
+	s3client       *minio.Client
 	db             *bolt.DB
 	startTime      time.Time
+	thumbnailSem   chan struct{}
 	metadataBucket []byte
+	staticDir      fs.FS // interface
 }
 
 func NewServer(opts *ServerOptions) (*Server, error) {
@@ -53,6 +86,37 @@ func NewServer(opts *ServerOptions) (*Server, error) {
 		startTime:      time.Now(),
 	}
 
+	if s.opts.MaxConcurrentThumbs <= 0 {
+		s.opts.MaxConcurrentThumbs = DEFAULT_MAX_CONCURRENT_THUMBS // default
+		log.Printf("Allowing %d concurrent thumbnails", s.opts.MaxConcurrentThumbs)
+	}
+
+	if s.opts.MaxThumbSizeBytes <= 0 {
+		s.opts.MaxThumbSizeBytes = DEFAULT_MAX_THUMBSIZE
+		log.Printf("Allowing thumbnails for files up to %d byte(s)", s.opts.MaxThumbSizeBytes)
+	}
+
+	s.staticDir, _ = fs.Sub(staticAssets, `static`) // can't fail
+
+	// Maybe open s3 connection
+	if s.opts.StorageType == STORAGE_S3 {
+		cl, err := minio.New(opts.DataS3Options.Hostname, &minio.Options{
+			Creds:  credentials.NewStaticV4(opts.DataS3Options.AccessKey, opts.DataS3Options.SecretKey, ""),
+			Secure: true,
+		})
+		if err != nil {
+			return nil, fmt.Errorf("Connecting to S3 host: %w", err)
+		}
+
+		s.s3client = cl
+	}
+
+	// "fill" the thumbnailer semaphore
+	s.thumbnailSem = make(chan struct{}, s.opts.MaxConcurrentThumbs)
+	for i := 0; i < s.opts.MaxConcurrentThumbs; i += 1 {
+		s.thumbnailSem <- struct{}{}
+	}
+
 	b, err := bolt.Open(opts.DBPath, 0644, bolt.DefaultOptions)
 	if err != nil {
 		return nil, err
@@ -125,7 +189,7 @@ func (this *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		this.handleInformation(w, r.URL.Path[len(metadataUrlPrefix):])
 
 	} else if r.Method == "GET" && strings.HasPrefix(r.URL.Path, previewUrlPrefix) {
-		this.handlePreview(w, r.URL.Path[len(previewUrlPrefix):])
+		this.handlePreview(r.Context(), w, r.URL.Path[len(previewUrlPrefix):])
 
 	} else if r.Method == "GET" && rxThumbUrl.MatchString(r.URL.Path) {
 		parts := rxThumbUrl.FindStringSubmatch(r.URL.Path)
@@ -141,11 +205,17 @@ func (this *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		// Blanket allow (headers already set)
 		w.WriteHeader(200)
 
-	} else if r.Method == "GET" && r.URL.Path == `/` && this.opts.EnableHomepage {
+	} else if r.Method == "GET" {
-		http.Redirect(w, r, `/index.html`, http.StatusFound)
 
-	} else if static, err := Asset(r.URL.Path[1:]); err == nil && r.Method == "GET" && (this.opts.EnableHomepage || r.URL.Path != `/index.html`) {
+		// Conditionally block homepage access
-		http.ServeContent(w, r, r.URL.Path[1:], this.startTime, bytes.NewReader(static))
+		if !this.opts.EnableHomepage && (r.URL.Path == `/index.html` || r.URL.Path == `/`) {
+			http.Error(w, "Not found", 404)
+			return
+		}
+
+		// Serve static html/css/js assets
+		// http.FileServer transparently redirects index.html->/ internally
+		http.FileServer(http.FS(this.staticDir)).ServeHTTP(w, r)
 
 	} else {
 		http.Error(w, "Not found", 404)

TODO.txt

@@ -1,14 +0,0 @@
-TODO
-
-- View server-wide recent uploads history / all upload history
-
-- Display 'my uploads' (id + metadata history kept in localstorage)
-
-- Encrypted at rest (anti- provider snooping)
-
-- Prevent selecting around the toggle buttons (firefox for android)
-
-- Detect when pasting creates one large file and one ~150 byte file(?? why does this happen?)
-
-- Detect when pasting an image URL, offer to download it (clientside?)
-

_dist/README.txt

@@ -1,92 +0,0 @@
-A file / image / paste upload server with a focus on embedding.
-
-Written in Go
-
-You can use contented as a standalone upload server, or you can use the SDK to embed its upload widget into another website.
-
-=FEATURES=
-
-- Drag and drop upload
-- Multiple files upload
-- Pastebin upload
-- Custom drawing upload ([url=https://github.com/Leimi/drawingboard.js]via[/url])
-- Ctrl-V upload
-- SDK-oriented design for embedding, including CORS support
-- Mobile friendly HTML interface
-- Preserves uploaded filename and content-type metadata
-- Hash verification (SHA512/256)
-- Detect duplicate upload content and reuse storage
-- Options to limit the upload filesize and the upload bandwidth
-- Short URLs (using [url=http://hashids.org]Hashids[/url] algorithm)
-- Image thumbnailing
-
-=USAGE (SERVER)=
-
-`Usage of contented:
-  -data string
-        Directory for stored content (default "")
-  -db string
-        Path for metadata database (default "contented.db")
-  -diskFilesWorldReadable
-        Save files as 0644 instead of 0600
-  -enableHomepage
-        Enable homepage (disable for embedded use only) (default true)
-  -listen string
-        IP/Port to bind server (default "127.0.0.1:80")
-  -max int
-        Maximum size of uploaded files in MiB (set zero for unlimited) (default 8)
-  -speed int
-        Maximum upload speed in bytes/sec (set zero for unlimited)
-  -title string
-        Title used in web interface (default "contented")
-  -trustXForwardedFor
-        Trust X-Forwarded-For reverse proxy headers
-`
-
-If you are hosting behind a reverse proxy, remember to set its post body size parameter appropriately (e.g. `client_max_body_size` for nginx).
-
-=USAGE (HTTP)=
-
-The server responds on the following URLs:
-
-- `/get/{ID}`: Download item content
-- `/info/{ID}`: Get item content metadata (JSON)
-- `/thumb/{Type}/{ID}`: Get item thumbnail image
-- `/about`: Get server metadata (JSON)
-
-=USAGE (EMBEDDING FOR WEB)=
-
-Your webpage should load the SDK from the contented server, then call the `contented.init` function to display the upload widget over the top of an existing DOM element. Your callback will be passed an array of file IDs of any uploaded items.
-
-`<script type="text/javascript" src="SERVER_ADDR/sdk.js"></script>
-contented.init("#target", function(/* String[] */ items) {});
-`
-
-=CHANGELOG=
-
-2017-11-18: 1.2.0
-- Feature: Thumbnail support
-- Feature: File preview page
-- Feature: Album mode (via URL `/p/{file1}-{file2}-...`)
-- Feature: New `-diskFilesWorldReadable` option to save files with `0644` mode
-
-2017-10-15: 1.1.0
-- Feature: Drawing mode
-- Feature: Ctrl+V image upload
-- Feature: Option to trust X-Forwarded-For headers when using a reverse proxy
-- Feature: Add `getDownloadURL`, `getInfoJSONURL`, `getPreviewURL` SDK methods
-- Feature: Option to disable uploading via the homepage
-- Feature: Add button to repeat when uploading from homepage
-- Enhancement: Automatically load library dependencies
-- Enhancement: Display homepage widget using the full screen size
-- Include drawingboard.js 0.4.6 (MIT license)
-- Fix a cosmetic issue with javascript console output
-- Fix a cosmetic issue with error messages if an upload failed
-
-2017-10-08: 1.0.1
-- Fix an issue with CORS preflight requests
-- Fix an issue with index URLs
-
-2017-10-08: 1.0.0
-- Initial public release
-- Include jQuery 1.12.4 (MIT license)

cmd/contented-multi/main.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"log"
+	"net/http"
+	"os"
+	"sync"
+
+	"code.ivysaur.me/contented"
+)
+
+type ContentedMultiCfg struct {
+	Servers []struct {
+		ListenAddr string
+		Options    contented.ServerOptions
+	}
+}
+
+func main() {
+	configFile := flag.String("config", "contented-multi.cfg", "Path to configuration file")
+	flag.Parse()
+
+	fh, err := os.Open(*configFile)
+	if err != nil {
+		panic(err)
+	}
+
+	var cfg ContentedMultiCfg
+	err = json.NewDecoder(fh).Decode(&cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	fh.Close()
+
+	wg := sync.WaitGroup{}
+	wg.Add(len(cfg.Servers))
+
+	for i, _ := range cfg.Servers {
+		go (func(i int) {
+			defer wg.Done()
+
+			s, err := contented.NewServer(&cfg.Servers[i].Options)
+			if err != nil {
+				log.Printf("Failed to create server %d/%d: %s", i+1, len(cfg.Servers), err.Error())
+				return
+			}
+
+			err = http.ListenAndServe(cfg.Servers[i].ListenAddr, s)
+			log.Printf("Server %d/%d shutting down: %s", i+1, len(cfg.Servers), err.Error())
+
+		})(i)
+	}
+
+	wg.Wait()
+}

cmd/contented/main.go

@@ -12,30 +12,59 @@ import (
 func main() {
 	cwd, _ := os.Getwd()
 
-	listenAddr := flag.String("listen", "127.0.0.1:80", "IP/Port to bind server")
+	var (
-	dataDir := flag.String("data", cwd, "Directory for stored content")
+		listenAddr             = flag.String("listen", "127.0.0.1:80", "IP/Port to bind server")
-	dbPath := flag.String("db", "contented.db", "Path for metadata database")
+		dataDir                = flag.String("data", cwd, "Directory for stored content")
-	appTitle := flag.String("title", "contented", "Title used in web interface")
+		dbPath                 = flag.String("db", "contented.db", "Path for metadata database")
-	maxUploadMb := flag.Int("max", 8, "Maximum size of uploaded files in MiB (set zero for unlimited)")
+		appTitle               = flag.String("title", "contented", "Title used in web interface")
-	maxUploadSpeed := flag.Int("speed", 0, "Maximum upload speed in bytes/sec (set zero for unlimited)")
+		maxUploadMb            = flag.Int("max", 8, "Maximum size of uploaded files in MiB (set zero for unlimited)")
-	trustXForwardedFor := flag.Bool("trustXForwardedFor", false, "Trust X-Forwarded-For reverse proxy headers")
+		maxUploadSpeed         = flag.Int("speed", 0, "Maximum upload speed in bytes/sec (set zero for unlimited)")
-	enableHomepage := flag.Bool("enableHomepage", true, "Enable homepage (disable for embedded use only)")
+		trustXForwardedFor     = flag.Bool("trustXForwardedFor", false, "Trust X-Forwarded-For reverse proxy headers")
-	diskFilesWorldReadable := flag.Bool("diskFilesWorldReadable", false, "Save files as 0644 instead of 0600")
+		enableHomepage         = flag.Bool("enableHomepage", true, "Enable homepage (disable for embedded use only)")
+		enableUpload           = flag.Bool("enableUpload", true, "Enable uploads (disable for read-only mode)")
+		diskFilesWorldReadable = flag.Bool("diskFilesWorldReadable", false, "Save files as 0644 instead of 0600")
+		maxConcurrentThumbs    = flag.Int("concurrentthumbs", contented.DEFAULT_MAX_CONCURRENT_THUMBS, "Simultaneous thumbnail generation")
+		s3Host                 = flag.String("s3hostname", "", "S3 Server hostname")
+		s3AccessKey            = flag.String("s3access", "", "S3 Access key")
+		s3SecretKey            = flag.String("s3secret", "", "S3 Secret key")
+		s3Bucket               = flag.String("s3bucket", "", "S3 Bucket")
+		s3Prefix               = flag.String("s3prefix", "", "S3 object prefix")
+	)
 
 	flag.Parse()
 
-	svr, err := contented.NewServer(&contented.ServerOptions{
+	opts := contented.ServerOptions{
-		DataDirectory:          *dataDir,
 		DBPath:                 *dbPath,
 		BandwidthLimit:         int64(*maxUploadSpeed),
 		TrustXForwardedFor:     *trustXForwardedFor,
 		EnableHomepage:         *enableHomepage,
+		EnableUpload:           *enableUpload,
 		DiskFilesWorldReadable: *diskFilesWorldReadable,
+		MaxConcurrentThumbs:    *maxConcurrentThumbs,
 		ServerPublicProperties: contented.ServerPublicProperties{
 			AppTitle:       *appTitle,
 			MaxUploadBytes: int64(*maxUploadMb) * 1024 * 1024,
 		},
-	})
+	}
+
+	if len(*s3AccessKey) > 0 {
+		opts.StorageType = contented.STORAGE_S3
+		opts.DataS3Options.Hostname = *s3Host
+		opts.DataS3Options.AccessKey = *s3AccessKey
+		opts.DataS3Options.SecretKey = *s3SecretKey
+		opts.DataS3Options.Bucket = *s3Bucket
+		opts.DataS3Options.Prefix = *s3Prefix
+
+	} else if len(*dataDir) > 0 {
+		opts.StorageType = contented.STORAGE_LOCAL
+		opts.DataDirectory = *dataDir
+
+	} else {
+		log.Println("Please specify either the -data or -s3__ options.")
+		os.Exit(1)
+	}
+
+	svr, err := contented.NewServer(&opts)
 	if err != nil {
 		log.Println(err.Error())
 		os.Exit(1)

download.go

@@ -4,7 +4,6 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"path/filepath"
 )
 
 func (this *Server) handleView(w http.ResponseWriter, r *http.Request, fileID string) {
@@ -28,7 +27,7 @@ func (this *Server) handleViewInternal(w http.ResponseWriter, r *http.Request, f
 	}
 
 	// Load file
-	f, err := os.Open(filepath.Join(this.opts.DataDirectory, m.FileHash))
+	f, err := this.ReadFile(r.Context(), m.FileHash)
 	if err != nil {
 		return err
 	}
@@ -37,12 +36,31 @@ func (this *Server) handleViewInternal(w http.ResponseWriter, r *http.Request, f
 
 	// ServeContent only uses the filename to get the mime type, which we can
 	// set accurately (including blacklist)
+
+	switch m.MimeType {
+	case `text/plain`:
+		w.Header().Set(`Content-Type`, `text/plain; charset=UTF-8`)
+
+	case `application/octet-stream`:
 		w.Header().Set(`Content-Type`, m.MimeType)
-	if m.MimeType == `application/octet-stream` {
 		w.Header().Set(`Content-Disposition`, `attachment; filename="`+m.Filename+`"`)
+
+	default:
+		w.Header().Set(`Content-Type`, m.MimeType)
 	}
 
+	/*
+		if _, ok := f.(io.ReadSeeker); ! ok {
+			// Stream directly, no support for bytes/etag
+			w.Header().Set(`Content-Length`, fmt.Sprintf("%d", m.FileSize))
+			_, err := io.Copy(w, f)
+			return err
+
+		}
+	*/
+
+	// Allow range requests, if-modified-since, and so on
 	http.ServeContent(w, r, "", m.UploadTime, f)
-
 	return nil
+
 }

go.mod

@@ -0,0 +1,33 @@
+module code.ivysaur.me/contented
+
+require (
+	code.ivysaur.me/thumbnail v1.0.2
+	github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f
+	github.com/speps/go-hashids v1.0.0
+	go.etcd.io/bbolt v1.3.7
+)
+
+require (
+	code.ivysaur.me/imagequant/v2 v2.12.6 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/golang-lru v0.5.4 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.16.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+	github.com/minio/md5-simd v1.1.2 // indirect
+	github.com/minio/minio-go/v7 v7.0.52 // indirect
+	github.com/minio/sha256-simd v1.0.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/rs/xid v1.4.0 // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	golang.org/x/crypto v0.6.0 // indirect
+	golang.org/x/image v0.0.0-20200618115811-c13761719519 // indirect
+	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+)
+
+go 1.19

go.sum

@@ -0,0 +1,69 @@
+code.ivysaur.me/imagequant/v2 v2.12.6 h1:xYrGj6GOdAcutmzqBxG7bDZ70r4jYHADOCZ+ktyMU3Y=
+code.ivysaur.me/imagequant/v2 v2.12.6/go.mod h1:seCAm0sP2IBsb1YNBj4D+EZovIuGe16+6Xo0aiGyhDU=
+code.ivysaur.me/thumbnail v1.0.2 h1:vQaRPbBZOUGpr4b5rrUOHiZv08XSRJ83uu64WXFx7mo=
+code.ivysaur.me/thumbnail v1.0.2/go.mod h1:sXeHBfmPfiSe5ZBKsbGSES13C9OSZq0WmT4yZ/XBeeE=
+github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
+github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
+github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
+github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
+github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/klauspost/compress v1.16.0 h1:iULayQNOReoYUe+1qtKOqw9CwJv3aNQu8ivo7lw1HU4=
+github.com/klauspost/compress v1.16.0/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/klauspost/cpuid/v2 v2.0.4/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/klauspost/cpuid/v2 v2.2.4 h1:acbojRNwl3o09bUq+yDCtZFc1aiwaAAxtcn8YkZXnvk=
+github.com/klauspost/cpuid/v2 v2.2.4/go.mod h1:RVVoqg1df56z8g3pUjL/3lE5UfnlrJX8tyFgg4nqhuY=
+github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
+github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
+github.com/minio/minio-go/v7 v7.0.52 h1:8XhG36F6oKQUDDSuz6dY3rioMzovKjW40W6ANuN0Dps=
+github.com/minio/minio-go/v7 v7.0.52/go.mod h1:IbbodHyjUAguneyucUaahv+VMNs/EOTV9du7A7/Z3HU=
+github.com/minio/sha256-simd v1.0.0 h1:v1ta+49hkWZyvaKwrQB8elexRqm6Y0aMLjCNsrYxo6g=
+github.com/minio/sha256-simd v1.0.0/go.mod h1:OuYzVNI5vcoYIAmbIvHPl3N3jUzVedXbKy5RFepssQM=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
+github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f h1:y5//uYreIhSUg3J1GEMiLbxo1LJaP8RfCpH6pymGZus=
+github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+o7JKHSa8/e818NopupXU1YMK5fe1lsApnBw=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rs/xid v1.4.0 h1:qd7wPTDkN6KQx2VmMBLrpHkiyQwgFXRnkOLacUiaSNY=
+github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
+github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/speps/go-hashids v1.0.0 h1:jdFC07PrExRM4Og5Ev4411Tox75aFpkC77NlmutadNI=
+github.com/speps/go-hashids v1.0.0/go.mod h1:P7hqPzMdnZOfyIk+xrlG1QaSMw+gCBdHKsBDnhpaZvc=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+go.etcd.io/bbolt v1.3.7 h1:j+zJOnnEjF/kyHlDDgGnVL/AIqIJPq8UoB2GSNfkUfQ=
+go.etcd.io/bbolt v1.3.7/go.mod h1:N9Mkw9X8x5fupy0IKsmuqVtoGDyxsaDlbk4Rd05IAQw=
+golang.org/x/crypto v0.6.0 h1:qfktjS5LUO+fFKeJXZ+ikTRijMmljikvG68fpMMruSc=
+golang.org/x/crypto v0.6.0/go.mod h1:OFC/31mSvZgRz0V1QTNCzfAI1aIRzbiufJtkMIlEp58=
+golang.org/x/image v0.0.0-20200618115811-c13761719519 h1:1e2ufUJNM3lCHEY5jIgac/7UTjd6cgJNdatjPdFWf34=
+golang.org/x/image v0.0.0-20200618115811-c13761719519/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/net v0.7.0 h1:rJrUqqhjsgNp7KqAIc25s9pZnjU7TUcSY7HcVZjdn1g=
+golang.org/x/net v0.7.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/sys v0.0.0-20180606202747-9527bec2660b h1:5rOiLYVqtE+JehJPVJTXQJaP8aT3cpJC1Iy22+5WLFU=
+golang.org/x/sys v0.0.0-20180606202747-9527bec2660b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20220704084225-05e143d24a9e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
+golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.7.0 h1:4BRB4x83lYWy72KwLD/qYDuTu7q9PjSagHvijDw7cLo=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
+gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

preview.go

@@ -1,6 +1,8 @@
 package contented
 
 import (
+	"context"
+	"encoding/json"
 	"fmt"
 	"html"
 	"log"
@@ -10,15 +12,56 @@ import (
 	"time"
 )
 
-func (this *Server) handlePreview(w http.ResponseWriter, fileIDList string) {
+func (this *Server) handlePreview(ctx context.Context, w http.ResponseWriter, fileIDList string) {
 
 	fileIDs := strings.Split(fileIDList, `-`)
 
+	// Early get metadata for the first listed element
+	specialTitle := ""
+	if len(fileIDs) == 1 {
+		mFirst, err := this.Metadata(fileIDs[0])
+		if err != nil { // Same error handling as below -
+			if os.IsNotExist(err) {
+				http.Error(w, "Not found", 404)
+				return
+			}
+
+			log.Println(err.Error())
+			http.Error(w, "Internal error", 500)
+			return
+		}
+
+		specialTitle = mFirst.Filename + " (" + fileIDs[0] + ")"
+	} else {
+		specialTitle = fmt.Sprintf("%d images", len(fileIDs))
+	}
+
 	tmpl := `<!DOCTYPE html>
-<html>
+<html prefix="og: http://ogp.me/ns#">
 	<head>
-		<title>` + html.EscapeString(this.opts.ServerPublicProperties.AppTitle) + `</title>
+		<title>` + html.EscapeString(specialTitle+" | "+this.opts.ServerPublicProperties.AppTitle) + `</title>
-		<meta name="viewport" content="width=device-width, initial-scale=1">
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<meta property="og:title" content="` + html.EscapeString(this.opts.ServerPublicProperties.AppTitle) + `" />
+		<meta property="og:site_name" content="` + html.EscapeString(this.opts.ServerPublicProperties.AppTitle) + `" />
+		<meta property="og:type" content="website" />
+`
+
+	if len(this.opts.ServerPublicProperties.CanonicalBaseURL) > 0 {
+		tmpl += `
+		<meta property="og:url" content="` + html.EscapeString(this.opts.ServerPublicProperties.CanonicalBaseURL+`p/`+fileIDList) + `" />
+		`
+	}
+
+	for _, fileID := range fileIDs {
+		tmpl += `
+		<meta property="og:image" content="` + html.EscapeString(`/thumb/m/`+fileID) + `" />
+		<meta property="og:image:type" content="image/jpeg" />
+		<meta property="og:image:width" content="300" />
+		<meta property="og:image:height" content="300" />
+		`
+	}
+
+	tmpl += `
 		<style type="text/css">
 html, body {
 	background: #333;
@@ -34,7 +77,21 @@ html, body {
 .thumbnail {
 	line-height: 0;
 	width: 340px;
+	height: 340px;
 	text-align: center;
+	position: relative;
+}
+.thumbnail-overlay {
+	position: absolute;
+	bottom: 4px;
+	right: 4px;
+	padding: 4px 8px;
+	line-height: 1.5em;
+	
+	pointer-events: none;
+	
+	background: red;
+	color: white;
 }
 .properties {
 	background: #000;
@@ -52,19 +109,79 @@ html, body {
 		m, err := this.Metadata(fileID)
 		if err != nil {
 			if os.IsNotExist(err) {
+
+				// If this is just one image out of many, show a 404 box and continue to show the other entries
+				// But if this is only a single image requested, abandon the whole pageload
+
+				if len(fileIDs) == 1 {
 					http.Error(w, "Not found", 404)
 					return
 				}
 
+				tmpl += `
+					<div class="entry">			
+						<div class="thumbnail">
+							<img loading="lazy" src="/nothumb_340.png"></a>
+						</div>
+						<div class="properties">
+							Requested ID ` + html.EscapeString(fileID) + ` not found in storage (404)
+						</div>
+					</div>
+				`
+
+				continue
+			}
+
 			log.Println(err.Error())
 			http.Error(w, "Internal error", 500)
 			return
 		}
 
+		if m.MimeType == ALBUM_MIMETYPE {
+			// Special handling for albums
+			f, err := this.ReadFile(ctx, m.FileHash)
+			if err != nil {
+				log.Printf("Opening file '%s' for preview of album '%s': %s", m.FileHash, fileID, err.Error())
+				http.Error(w, "Internal error", 500)
+				return
+			}
+
+			var childIDs []string
+			err = json.NewDecoder(f).Decode(&childIDs)
+			f.Close()
+			if err != nil {
+				log.Printf("Failed to parse album '%s': %s", fileID, err)
+				http.Error(w, "Internal error", 500)
+				return
+			}
+
+			albumThumb := `/nothumb_340.png`
+			if len(childIDs) > 0 {
+				albumThumb = `/thumb/m/` + childIDs[0]
+			}
+
 			tmpl += `
 				<div class="entry">			
 					<div class="thumbnail">
-					<a href="` + html.EscapeString(`/get/`+fileID) + `"><img src="` + html.EscapeString(`/thumb/m/`+fileID) + `"></a>
+						<a href="` + html.EscapeString(`/p/`+strings.Join(childIDs, `-`)) + `"><img loading="lazy" src="` + html.EscapeString(albumThumb) + `"></a>
+						<div class="thumbnail-overlay">` + fmt.Sprintf("%d", len(childIDs)) + ` image(s)</div>
+					</div>
+					<div class="properties">
+						<b>Name:</b> ` + html.EscapeString(m.Filename) + `<br>
+						<b>Hash:</b> <span title="` + html.EscapeString(m.FileHash) + `">hover</span><br>
+						<b>File type:</b> Album<br>
+						<b>Size:</b> ` + fmt.Sprintf("%d", len(childIDs)) + ` image(s)<br>
+						<b>Uploader:</b> ` + html.EscapeString(m.UploadIP) + `<br>
+						<b>Uploaded at:</b> ` + html.EscapeString(m.UploadTime.Format(time.RFC3339)) + `<br>
+					</div>
+				</div>
+			`
+
+		} else {
+			tmpl += `
+				<div class="entry">			
+					<div class="thumbnail">
+						<a href="` + html.EscapeString(`/get/`+fileID) + `"><img loading="lazy" src="` + html.EscapeString(`/thumb/m/`+fileID) + `"></a>
 					</div>
 					<div class="properties">
 						<b>Name:</b> ` + html.EscapeString(m.Filename) + `<br>
@@ -77,6 +194,7 @@ html, body {
 				</div>
 			`
 		}
+	}
 
 	if this.opts.EnableHomepage {
 		tmpl += `

static/index.html

@@ -38,7 +38,7 @@ button.again {
 			</div>
 		</div>
         
-        <script type="text/javascript" src="/jquery-1.12.4.min.js"></script>
+        <script type="text/javascript" src="/jquery-3.7.0.min.js"></script>
 		<script type="text/javascript" src="/sdk.js"></script>
         <script type="text/javascript">
 "use strict";

static/sdk.js

@@ -1,28 +1,6 @@
-;
+;(function() {
-
-//
-
-var contented = (function() {
 	"use strict";
 	
-	// @ref https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob 
-	if (!HTMLCanvasElement.prototype.toBlob) {
-		Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
-			value: function (callback, type, quality) {
-
-				var binStr = atob( this.toDataURL(type, quality).split(',')[1] ),
-					len = binStr.length,
-					arr = new Uint8Array(len);
-
-				for (var i = 0; i < len; i++ ) {
-					arr[i] = binStr.charCodeAt(i);
-				}
-
-				callback( new Blob( [arr], {type: type || 'image/png'} ) );
-			}
-		});
-	}
-
 	var getCurrentScriptPath = function () {
 		// Determine current script path
 		// @ref https://stackoverflow.com/a/26023176
@@ -34,87 +12,14 @@ var contented = (function() {
 		return currentScript.replace(currentScriptFile, '');
 	};
 	
-	var currentScriptPath = getCurrentScriptPath();
+	var loadScript = function(url) {
-	var baseURL = currentScriptPath.replace('sdk.js', '');
+		return new Promise(function(resolve, reject) {
-	
-	return {
-		"loaded": false,
-		
-		"baseURL": baseURL,
-		
-		"__preInit": [],
-		
-		/**
-		* initArea shows the contented upload widget over the top of a target DOM element.
-		*
-		* @param any        element       Drop target (string selector / DOMElement / jQuery)
-		* @param Function   onUploaded    Called with an array of upload IDs
-		* @param Function   onClose       Called when the widget is being destroyed
-		*/
-		"init": function(elementSelector, onUploaded, onClose) {
-			contented.__preInit.push([elementSelector, onUploaded, onClose]);
-		},
-		
-		/**
-		* supportsDrop returns whether drag-and-drop is supported by this browser.
-		*
-		* @return bool
-		*/
-		"supportsDrop": function() {
-			return ('ondrop' in window && 'FormData' in window && 'FileReader' in window);
-		},
-		
-		"getPreviewURL": function(id) {
-			return baseURL + "p/" + encodeURIComponent(id);
-		},
-		"getMultiPreviewURL": function(items) {
-			return baseURL + "p/" + encodeURIComponent(items.join("-"));
-		},
-		"getDownloadURL": function(id) {
-			return baseURL + "get/" + encodeURIComponent(id);
-		},
-		"getInfoJSONURL": function(id) {
-			return baseURL + "info/" + encodeURIComponent(id);
-		},
-		"getThumbnailURL": function(thumbnailType, id) {
-			return baseURL + "thumb/" + encodeURIComponent(thumbnailType) + "/" + encodeURIComponent(id);
-		},
-		"thumbnail": {
-			"small_square": "s",
-			"medium_square": "b",
-			"medium": "t",
-			"large": "m",
-			"xlarge": "l",
-			"xxlarge": "h"
-		}
-	};
-	
-})();
-
-;(function() {
-	"use strict";
-	
-	var loadScript = function(url, onLoad) {
 			var script = document.createElement('script');
-		script.onload = onLoad;
+			script.onload = resolve;
+			script.onerror = reject;
 			script.src = url;
 			document.head.appendChild(script);
-	};
+		});
-	
-	var loadScripts = function(urls, onLoad) {
-		// load sequentially
-		var i = 0;
-		var loadNext = function() {
-			if (i === urls.length) {
-				onLoad();
-				return;
-			}
-			
-			var url = urls[i];
-			i += 1;
-			loadScript(url, loadNext);
-		};
-		loadNext();
 	};
 	
     var formatBytes = function(bytes) {
@@ -139,9 +44,184 @@ var contented = (function() {
 		});
 	};
 
-	var afterScriptsLoaded = function() {		
+	var widgetHtml = `
+<style type="text/css">
+	.contented {
+		box-sizing:border-box;
+		text-align: center;
+		border: 8px dashed lightgrey;
+		padding: 12px;
+		background:white; /* not transparent */
 	
-		var initArea = function (elementSelector, onUploaded, onClose) {
+		text-overflow:hidden;
+		overflow:auto;
+		width:100%;
+		height:100%;
+	
+		position:relative;
+	}
+	.contented .contented-close {
+		position: absolute;
+		top: 12px;
+		right: 12px;
+		width: 24px;
+		height: 24px;
+		cursor: pointer;
+	}
+	.contented .contented-upload-type-selector {
+		display:block;
+		margin-bottom: 1em;
+		-webkit-user-select: none;
+		user-select: none; 
+	}
+	.contented .contented-upload-type {
+		display:inline-block;
+		opacity:0.2;
+		transition:opacity linear 0.1s;
+		cursor:pointer;
+	}
+	.contented .contented-upload-type:hover {
+		opacity:0.5;
+		transition:opacity linear 0s;
+	}
+	.contented .contented-upload-type svg {
+		width:36px;
+		height:36px;
+	}
+	.contented .contented-upload-type.contented-upload-type-active {
+		opacity:1;
+	}
+	.contented.is-dragging {
+		background: lightblue;
+	}
+	.contented-content-area {
+		position:absolute;
+		top: 60px;
+		bottom: 10px;
+		left: 10px;
+		width: calc(100% - 20px);
+	
+		/* Prevent blur under translateY */
+		-webkit-transform-style: preserve-3d;
+		-moz-transform-style: preserve-3d;
+		transform-style: preserve-3d;
+	}
+	.contented-content-area > div {
+		position: relative;
+		top: 50%;
+		transform: translateY(-50%);
+	}
+	.contented-upload-if {
+		display:none;
+	}
+	.contented-if-paste, .contented-if-drawing {
+		height:100%;
+	}
+	.contented-upload-if.contented-active {
+		display:block;
+	}
+	.contented textarea {
+		resize: none;
+		width:100%;
+		height:calc(100% - 1em - 15px);
+		box-sizing:border-box;
+	}
+	.contented-progress-bar {
+		display: block;
+		width:90%;
+		margin:0.5em auto 0 auto;
+	
+		height:16px;
+		border-radius:8px;
+		background:lightgrey;
+		position:relative;
+		overflow:hidden;
+	}
+	.contented-progress-element {
+		position:absolute;
+		background:darkgreen;
+		left:0;
+		width:0%;
+		height:100%;
+	}
+</style>
+<div class="contented">
+
+	<div class="contented-close">
+		<svg viewBox="0 0 24 24">
+			<path fill="#000000" d="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z" />
+		</svg>
+	</div>
+
+	<div class="contented-upload-type-selector">
+
+		<div class="contented-upload-type contented-upload-type-active" data-upload-type="drag" title="Drag and drop">
+			<svg viewBox="0 0 24 24">
+				<path fill="#000000" d="M5,20H19V18H5M19,9H15V3H9V9H5L12,16L19,9Z"></path>
+			</svg>
+		</div>
+
+		<div class="contented-upload-type" data-upload-type="file" title="Multiple files">
+			<svg viewBox="0 0 24 24">
+				<path fill="#000000" d="M15,7H20.5L15,1.5V7M8,0H16L22,6V18A2,2 0 0,1 20,20H8C6.89,20 6,19.1 6,18V2A2,2 0 0,1 8,0M4,4V22H20V24H4A2,2 0 0,1 2,22V4H4Z"></path>
+			</svg>
+		</div>
+
+		<div class="contented-upload-type" data-upload-type="paste" title="Paste">
+			<svg viewBox="0 0 24 24">
+				<path fill="#000000" d="M19,20H5V4H7V7H17V4H19M12,2A1,1 0 0,1 13,3A1,1 0 0,1 12,4A1,1 0 0,1 11,3A1,1 0 0,1 12,2M19,2H14.82C14.4,0.84 13.3,0 12,0C10.7,0 9.6,0.84 9.18,2H5A2,2 0 0,0 3,4V20A2,2 0 0,0 5,22H19A2,2 0 0,0 21,20V4A2,2 0 0,0 19,2Z" />
+			</svg>
+		</div>
+		
+		<div class="contented-upload-type" data-upload-type="drawing" title="Drawing">
+			<svg viewBox="0 0 24 24">
+				<path fill="#000000" d="M16.84,2.73C16.45,2.73 16.07,2.88 15.77,3.17L13.65,5.29L18.95,10.6L21.07,8.5C21.67,7.89 21.67,6.94 21.07,6.36L17.9,3.17C17.6,2.88 17.22,2.73 16.84,2.73M12.94,6L4.84,14.11L7.4,14.39L7.58,16.68L9.86,16.85L10.15,19.41L18.25,11.3M4.25,15.04L2.5,21.73L9.2,19.94L8.96,17.78L6.65,17.61L6.47,15.29" />
+			</svg>
+		</div>
+
+		<div class="contented-upload-type" data-upload-type="album" title="Album">
+			<svg viewBox="0 0 24 24">
+				<path fill="#000000" d="M3,3H21V7H3V3M4,8H20V21H4V8M9.5,11A0.5,0.5 0 0,0 9,11.5V13H15V11.5A0.5,0.5 0 0,0 14.5,11H9.5Z" />
+			</svg>
+		</div>
+	</div>
+	
+	<div class="contented-content-area">
+		<div class="contented-upload-if contented-if-drag contented-active">
+			<label>Drop files or Ctrl-V to upload <span class="contented-extratext"></span></label>
+		</div>
+
+		<div class="contented-upload-if contented-if-file">
+			<label>Select files to upload <span class="contented-extratext"></span></label><br>
+			<input class="contented-file-selector" type="file" multiple>
+			<button class="contented-file-upload">Upload &raquo;</button>
+		</div>
+
+		<div class="contented-upload-if contented-if-paste">
+			<textarea placeholder="Paste content here"></textarea>
+			<button class="contented-paste-upload">Upload &raquo;</button>
+		</div>
+
+		<div class="contented-upload-if contented-if-drawing">
+			<div class="contented-drawing-area"></div>
+		</div>
+		
+		<div class="contented-upload-if contented-if-progress">
+			<label>...</label>
+			<div class="contented-progress-bar"><div class="contented-progress-element"></div></div>
+		</div>
+
+		<div class="contented-upload-if contented-if-album">
+			<input type="text" class="contented-album-title" placeholder="Album name"><br>
+			<input type="text" class="contented-album-items" placeholder="Image IDs, separated with commas">
+			<br><br>
+			<button class="contented-album-upload">Make album &raquo;</button>
+		</div>
+	</div>
+</div>
+`;
+
+	var initArea = function (aboutInfo, elementSelector, onUploaded, onClose) {
 		onUploaded = onUploaded || function () { };
 		onClose = onClose || function () { };
 
@@ -153,15 +233,12 @@ var contented = (function() {
 		// <input type="hidden" name="MAX_FILE_SIZE" value="` + ret.MaxUploadBytes + `" /> 
 
 		// Create a new div for ourselves on top of the existing area
-			$.get(contented.baseURL + "about", function (ret) {
 		
 		var extraText = "";
-				if (ret.MaxUploadBytes > 0) {
+		if (aboutInfo.MaxUploadBytes > 0) {
-					extraText = " (max " + formatBytes(ret.MaxUploadBytes) + ")";
+			extraText = " (max " + formatBytes(aboutInfo.MaxUploadBytes) + ")";
 		}
 
-				$.get(contented.baseURL + "widget.html", function (widgetHtml) {
-
 		var $f = $("<div>").html(widgetHtml);
 		$f.find(".contented-extratext").text(extraText);
 
@@ -243,6 +320,37 @@ var contented = (function() {
 			handleUploadFrom([blob]);
 		});
 
+		// Album
+
+		$f.find(".contented-album-upload").on("click", function(e) {
+			e.preventDefault();
+			e.stopPropagation();
+
+			var title = $(".contented-album-title").val();
+			if (title === "") {
+				title = "Untitled album";
+			}
+
+			var childIDs = $(".contented-album-items").val().split(",");
+
+			for (var i = 0; i < childIDs.length; ++i) {
+				childIDs[i] = childIDs[i].trim(); // Basic validation - can't really perform full validation here
+
+				if (childIDs[i].length == 0) {
+					alert("Entry " + (i+1) + " is too short, expected non-zero length");
+					return;
+				}
+
+				if (! childIDs[i].match(/^[a-zA-Z0-9]+$/)) {
+					alert("Entry " + (i+1) + " contains unexpected character");
+					return;
+				}
+			}
+
+			var blob = new Blob([JSON.stringify(childIDs)], {type : 'contented/album'});
+			handleUploadFrom([new File([blob], title, {type: 'contented/album'})]);
+		});
+
 		// Ctrl+V uploads
 		
 		var pasteHandler = function(e) {
@@ -379,6 +487,10 @@ var contented = (function() {
 
 		// Common upload handler
 		
+		/**
+		 * 
+		 * @param {File[]|Blob[]} files 
+		 */
 		var handleUploadFrom = function(files) {
 
 			setProgressCaption("Uploading, please wait...");
@@ -432,33 +544,97 @@ var contented = (function() {
 
 		}
 
-					// .
+	};
 
-				});
+	var init = function() {
 
-			});
+		var currentScriptPath = getCurrentScriptPath();
+		var baseURL = currentScriptPath.replace('sdk.js', '');
 		
+		// Kick off background promises
+
+		var loader = new Promise(function(resolve, reject) {
+			if (typeof jQuery === "undefined") {
+				loadScript(contented.baseURL + "jquery-3.7.0.min.js").then(resolve);
+			} else {
+				resolve();
 			}
 
-		// Update fields in global variable
+		}).then(function() { return new Promise(function(resolve, reject) {
-		contented.init = initArea;
+			if (typeof DrawingBoard === "undefined") {
-		contented.loaded = true;
+				loadScript(contented.baseURL + "drawingboard-0.4.6.min.js").then(resolve);
+			} else {
+				resolve();
+			}
 
-		// Call initArea for all pre-initialised elements
+		})}).then(function() { return new Promise(function(resolve, reject) {
-		for (var i = 0; i < contented.__preInit.length; ++i) {
+			$.get(contented.baseURL + "about", function (aboutInfo) {
-			initArea(contented.__preInit[i][0], contented.__preInit[i][1], contented.__preInit[i][2]);
+				resolve(aboutInfo);
+			});
+
+		})}).then(function(aboutInfo) {
+			// Update fields in global variable
+			window.contented.loaded = true;
+			
+			return aboutInfo;
+		});
+
+		window.contented = {
+			"loaded": false,
+			
+			"baseURL": baseURL,
+			
+			"__preInit": [],
+			
+			/**
+			* initArea shows the contented upload widget over the top of a target DOM element.
+			*
+			* @param any        element       Drop target (string selector / DOMElement / jQuery)
+			* @param Function   onUploaded    Called with an array of upload IDs
+			* @param Function   onClose       Called when the widget is being destroyed
+			*/
+			"init": function(elementSelector, onUploaded, onClose) {
+				loader.then(function(aboutInfo) {
+					initArea(aboutInfo, elementSelector, onUploaded, onClose);
+				});
+			},
+			
+			/**
+			* supportsDrop returns whether drag-and-drop is supported by this browser.
+			*
+			* @return bool
+			*/
+			"supportsDrop": function() {
+				return ('ondrop' in window && 'FormData' in window && 'FileReader' in window);
+			},
+			
+			"getPreviewURL": function(id) {
+				return baseURL + "p/" + encodeURIComponent(id);
+			},
+			"getMultiPreviewURL": function(items) {
+				return baseURL + "p/" + encodeURIComponent(items.join("-"));
+			},
+			"getDownloadURL": function(id) {
+				return baseURL + "get/" + encodeURIComponent(id);
+			},
+			"getInfoJSONURL": function(id) {
+				return baseURL + "info/" + encodeURIComponent(id);
+			},
+			"getThumbnailURL": function(thumbnailType, id) {
+				return baseURL + "thumb/" + encodeURIComponent(thumbnailType) + "/" + encodeURIComponent(id);
+			},
+			"thumbnail": {
+				"small_square": "s",
+				"medium_square": "b",
+				"medium": "t",
+				"large": "m",
+				"xlarge": "l",
+				"xxlarge": "h"
 			}
 		};
 	
-	// Load scripts
+	};
-	var needScripts = [];
-	if (typeof jQuery === "undefined") {
-		needScripts.push(contented.baseURL + "jquery-1.12.4.min.js");
-	}
-	if (typeof DrawingBoard === "undefined") {
-		needScripts.push(contented.baseURL + "drawingboard-0.4.6.min.js");
-	}
 
-	loadScripts(needScripts, afterScriptsLoaded);
+	init();
 
 })()

static/widget.html

@@ -1,161 +0,0 @@
-<style type="text/css">
-.contented {
-    box-sizing:border-box;
-    text-align: center;
-    border: 8px dashed lightgrey;
-    padding: 12px;
-    background:white; /* not transparent */
-
-    text-overflow:hidden;
-    overflow:auto;
-    width:100%;
-    height:100%;
-
-    position:relative;
-}
-.contented .contented-close {
-    position: absolute;
-    top: 12px;
-    right: 12px;
-    width: 24px;
-    height: 24px;
-    cursor: pointer;
-}
-.contented .contented-upload-type-selector {
-    display:block;
-    margin-bottom: 1em;
-    -webkit-user-select: none;
-    user-select: none; 
-}
-.contented .contented-upload-type {
-    display:inline-block;
-    opacity:0.2;
-    transition:opacity linear 0.1s;
-    cursor:pointer;
-}
-.contented .contented-upload-type:hover {
-    opacity:0.5;
-    transition:opacity linear 0s;
-}
-.contented .contented-upload-type svg {
-    width:36px;
-    height:36px;
-}
-.contented .contented-upload-type.contented-upload-type-active {
-    opacity:1;
-}
-.contented.is-dragging {
-    background: lightblue;
-}
-.contented-content-area {
-    position:absolute;
-    top: 60px;
-    bottom: 10px;
-    left: 10px;
-    width: calc(100% - 20px);
-
-    /* Prevent blur under translateY */
-    -webkit-transform-style: preserve-3d;
-    -moz-transform-style: preserve-3d;
-    transform-style: preserve-3d;
-}
-.contented-content-area > div {
-    position: relative;
-    top: 50%;
-    transform: translateY(-50%);
-}
-.contented-upload-if {
-    display:none;
-}
-.contented-if-paste, .contented-if-drawing {
-    height:100%;
-}
-.contented-upload-if.contented-active {
-    display:block;
-}
-.contented textarea {
-    resize: none;
-    width:100%;
-    height:calc(100% - 1em - 15px);
-    box-sizing:border-box;
-}
-.contented-progress-bar {
-    display: block;
-    width:90%;
-    margin:0.5em auto 0 auto;
-
-    height:16px;
-    border-radius:8px;
-    background:lightgrey;
-    position:relative;
-    overflow:hidden;
-}
-.contented-progress-element {
-    position:absolute;
-    background:darkgreen;
-    left:0;
-    width:0%;
-    height:100%;
-}
-</style>
-<div class="contented">
-
-    <div class="contented-close">
-        <svg viewBox="0 0 24 24">
-            <path fill="#000000" d="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z" />
-        </svg>
-    </div>
-
-    <div class="contented-upload-type-selector">
-
-        <div class="contented-upload-type contented-upload-type-active" data-upload-type="drag" title="Drag and drop">
-            <svg viewBox="0 0 24 24">
-                <path fill="#000000" d="M5,20H19V18H5M19,9H15V3H9V9H5L12,16L19,9Z"></path>
-            </svg>
-        </div>
-
-        <div class="contented-upload-type" data-upload-type="file" title="Multiple files">
-            <svg viewBox="0 0 24 24">
-                <path fill="#000000" d="M15,7H20.5L15,1.5V7M8,0H16L22,6V18A2,2 0 0,1 20,20H8C6.89,20 6,19.1 6,18V2A2,2 0 0,1 8,0M4,4V22H20V24H4A2,2 0 0,1 2,22V4H4Z"></path>
-            </svg>
-        </div>
-
-        <div class="contented-upload-type" data-upload-type="paste" title="Paste">
-            <svg viewBox="0 0 24 24">
-                <path fill="#000000" d="M19,20H5V4H7V7H17V4H19M12,2A1,1 0 0,1 13,3A1,1 0 0,1 12,4A1,1 0 0,1 11,3A1,1 0 0,1 12,2M19,2H14.82C14.4,0.84 13.3,0 12,0C10.7,0 9.6,0.84 9.18,2H5A2,2 0 0,0 3,4V20A2,2 0 0,0 5,22H19A2,2 0 0,0 21,20V4A2,2 0 0,0 19,2Z" />
-            </svg>
-        </div>
-        
-        <div class="contented-upload-type" data-upload-type="drawing" title="Drawing">
-			<svg viewBox="0 0 24 24">
-				<path fill="#000000" d="M16.84,2.73C16.45,2.73 16.07,2.88 15.77,3.17L13.65,5.29L18.95,10.6L21.07,8.5C21.67,7.89 21.67,6.94 21.07,6.36L17.9,3.17C17.6,2.88 17.22,2.73 16.84,2.73M12.94,6L4.84,14.11L7.4,14.39L7.58,16.68L9.86,16.85L10.15,19.41L18.25,11.3M4.25,15.04L2.5,21.73L9.2,19.94L8.96,17.78L6.65,17.61L6.47,15.29" />
-			</svg>
-		</div>
-    </div>
-    
-    <div class="contented-content-area">
-        <div class="contented-upload-if contented-if-drag contented-active">
-            <label>Drop files or Ctrl-V to upload <span class="contented-extratext"></span></label>
-        </div>
-
-        <div class="contented-upload-if contented-if-file">
-            <label>Select files to upload <span class="contented-extratext"></span></label><br>
-            <input class="contented-file-selector" type="file" multiple>
-            <button class="contented-file-upload">Upload &raquo;</button>
-        </div>
-
-        <div class="contented-upload-if contented-if-paste">
-            <textarea placeholder="Paste content here"></textarea>
-            <button class="contented-paste-upload">Upload &raquo;</button>
-        </div>
-
-        <div class="contented-upload-if contented-if-drawing">
-			<div class="contented-drawing-area"></div>
-        </div>
-        
-        <div class="contented-upload-if contented-if-progress">
-            <label>...</label>
-            <div class="contented-progress-bar"><div class="contented-progress-element"></div></div>
-        </div>
-    </div>
-</div>

storage.go

@@ -0,0 +1,57 @@
+package contented
+
+import (
+	"context"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/minio/minio-go/v7"
+)
+
+func (this *Server) ReadFile(ctx context.Context, fileHash string) (io.ReadSeekCloser, error) {
+	if this.opts.StorageType == STORAGE_LOCAL {
+		fh, err := os.Open(filepath.Join(this.opts.DataDirectory, fileHash))
+		return fh, err
+
+	} else if this.opts.StorageType == STORAGE_S3 {
+		obj, err := this.s3client.GetObject(ctx, this.opts.DataS3Options.Bucket, this.opts.DataS3Options.Prefix+fileHash, minio.GetObjectOptions{})
+		if err != nil {
+			return nil, err
+		}
+
+		return obj, nil
+
+	} else {
+		panic("bad StorageType")
+	}
+}
+
+func (this *Server) SaveFile(ctx context.Context, fileHash string, srcLen int64, src io.Reader) error {
+	if this.opts.StorageType == STORAGE_LOCAL {
+
+		// Save file to disk
+		dest, err := os.OpenFile(filepath.Join(this.opts.DataDirectory, fileHash), os.O_CREATE|os.O_WRONLY, this.opts.FileMode())
+		if err != nil {
+			if os.IsExist(err) {
+				return nil // hash matches existing upload
+			}
+
+			return err // Real error
+		}
+		defer dest.Close()
+
+		_, err = io.CopyN(dest, src, int64(srcLen))
+		if err != nil {
+			return err
+		}
+		return nil
+
+	} else if this.opts.StorageType == STORAGE_S3 {
+		_, err := this.s3client.PutObject(ctx, this.opts.DataS3Options.Bucket, this.opts.DataS3Options.Prefix+fileHash, src, srcLen, minio.PutObjectOptions{})
+		return err
+
+	} else {
+		panic("bad StorageType")
+	}
+}

thumb.go

@@ -1,61 +1,94 @@
 package contented
 
 import (
+	"context"
 	"errors"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
+	"os"
 	"path/filepath"
 
 	"code.ivysaur.me/thumbnail"
 )
 
-func thumbnailer(t byte) (*thumbnail.Thumbnailer, error) {
+func getThumbnailerConfig(t byte) (*thumbnail.Config, error) {
 	// Modelled on what imgur.com offers
 	// @ref https://api.imgur.com/models/image#thumbs
 
-	const (
+	opts := thumbnail.Config{
-		cacheSize = 1
+		Aspect: thumbnail.FitOutside,
-		outputFmt = thumbnail.OUTPUT_JPG
+		Output: thumbnail.Jpeg,
-		scaleFmt  = thumbnail.SCALEFMT_BILINEAR
+		Scale:  thumbnail.Bicubic,
-	)
+	}
 
 	switch t {
 	case 's':
-		return thumbnail.NewThumbnailerEx(90, 90, cacheSize, outputFmt, thumbnail.ASPECT_CROP_TO_DIMENSIONS, scaleFmt), nil
+		opts.Width = 90
+		opts.Height = 90
 	case 'b':
-		return thumbnail.NewThumbnailerEx(160, 160, cacheSize, outputFmt, thumbnail.ASPECT_CROP_TO_DIMENSIONS, scaleFmt), nil
+		opts.Width = 160
+		opts.Height = 160
 	case 't':
-		return thumbnail.NewThumbnailerEx(160, 160, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
+		opts.Width = 160
+		opts.Height = 160
+		// thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY
 	case 'm':
-		return thumbnail.NewThumbnailerEx(340, 340, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
+		opts.Width = 340
+		opts.Height = 340
+		// thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY
 	case 'l':
-		return thumbnail.NewThumbnailerEx(640, 640, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
+		opts.Width = 640
+		opts.Height = 640
+		// thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY
 	case 'h':
-		return thumbnail.NewThumbnailerEx(1024, 1024, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
+		opts.Width = 1024
+		opts.Height = 1024
+		// thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY
 	default:
 		return nil, errors.New("Unsupported thumbnail type (should be s/b/t/m/l/h)")
 	}
+
+	return &opts, nil
 }
 
 func (this *Server) handleThumb(w http.ResponseWriter, r *http.Request, thumbnailType byte, fileId string) {
-	t, err := thumbnailer(thumbnailType)
+	ctx := r.Context()
+
+	opts, err := getThumbnailerConfig(thumbnailType)
 	if err != nil {
 		log.Printf("%s Thumbnail failed: %s\n", this.remoteIP(r), err.Error())
 		http.Error(w, err.Error(), 400)
 		return
 	}
 
-	err = this.handleThumbInternal(w, t, fileId)
+	// Only a limited number of thumbnails can be generated concurrently
+	select {
+	case <-this.thumbnailSem:
+	case <-r.Context().Done():
+		http.Error(w, r.Context().Err().Error(), 400) // probably won't be delivered anyway
+		return
+	}
+	defer func() { this.thumbnailSem <- struct{}{} }()
+
+	if ctx.Err() != nil {
+		// The request was already cancelled
+		return
+	}
+
+	t := thumbnail.NewThumbnailerEx(opts)
+
+	err = this.handleThumbInternal(ctx, w, t, fileId)
 	if err != nil {
 		log.Printf("%s Thumbnail failed: %s\n", this.remoteIP(r), err.Error())
 
-		w.Header().Set(`Location`, fmt.Sprintf(`/nothumb_%d.png`, t.Height()))
+		w.Header().Set(`Location`, fmt.Sprintf(`/nothumb_%d.png`, opts.Height))
 		w.WriteHeader(302)
 	}
 }
 
-func (this *Server) handleThumbInternal(w http.ResponseWriter, t *thumbnail.Thumbnailer, fileId string) error {
+func (this *Server) handleThumbInternal(ctx context.Context, w http.ResponseWriter, t thumbnail.Thumbnailer, fileId string) error {
 
 	// Load metadata
 	m, err := this.Metadata(fileId)
@@ -63,12 +96,45 @@ func (this *Server) handleThumbInternal(w http.ResponseWriter, t *thumbnail.Thum
 		return err
 	}
 
-	filePath := filepath.Join(this.opts.DataDirectory, m.FileHash)
+	if m.FileSize > this.opts.MaxThumbSizeBytes {
-	thumb, err := t.RenderFile_NoCache_MimeType(filePath, m.MimeType)
+		return errors.New("Don't want to thumbnail very large files, sorry")
+	}
+
+	var filePath string
+
+	if this.opts.StorageType == STORAGE_LOCAL {
+		filePath = filepath.Join(this.opts.DataDirectory, m.FileHash)
+
+	} else if this.opts.StorageType == STORAGE_S3 {
+		// Need to temporarily download it for thumbnailing (slow and costs money)
+
+		destFh, err := os.CreateTemp("", "contented-thumbcache-*")
+		defer os.Remove(destFh.Name())
+
+		srcFh, err := this.ReadFile(ctx, m.FileHash)
 		if err != nil {
 			return err
 		}
 
+		_, err = io.CopyN(destFh, srcFh, m.FileSize)
+		srcFh.Close()
+		if err != nil {
+			return err
+		}
+
+		destFh.Seek(0, io.SeekStart)
+		filePath = destFh.Name()
+
+	} else {
+		panic("bad StorageType")
+	}
+
+	thumb, err := t.RenderFileAs(filePath, m.MimeType)
+	if err != nil {
+		return err
+	}
+
+	w.Header().Set(`Cache-Control`, `max-age=31536000, immutable`)
 	w.Header().Set(`Content-Length`, fmt.Sprintf("%d", len(thumb)))
 	w.Header().Set(`Content-Type`, `image/jpeg`)
 	w.WriteHeader(200)

upload.go

@@ -1,6 +1,7 @@
 package contented
 
 import (
+	"context"
 	"crypto/sha512"
 	"encoding/hex"
 	"encoding/json"
@@ -9,18 +10,21 @@ import (
 	"mime"
 	"mime/multipart"
 	"net/http"
-	"os"
 	"path"
-	"path/filepath"
 	"strings"
 	"time"
 )
 
 func (this *Server) handleUpload(w http.ResponseWriter, r *http.Request) {
 
+	if !this.opts.EnableUpload {
+		http.Error(w, "Server is read-only", 403)
+		return
+	}
+
 	remoteIP := this.remoteIP(r)
 
-	err := r.ParseMultipartForm(this.opts.MaxUploadBytes * 2)
+	err := r.ParseMultipartForm(0) // buffer upload in temporary files on disk, not memory
 	if err != nil {
 		log.Printf("%s Invalid request: %s\n", remoteIP, err.Error())
 		http.Error(w, "Invalid request", 400)
@@ -89,26 +93,13 @@ func (this *Server) handleUploadFile(src multipart.File, hdr *multipart.FileHead
 		return "", err
 	}
 
-	// Save file to disk
 	fileHash := hex.EncodeToString(hasher.Sum(nil))
-	dest, err := os.OpenFile(filepath.Join(this.opts.DataDirectory, fileHash), os.O_CREATE|os.O_WRONLY, this.opts.FileMode())
-	shouldSave := true
-	if err != nil && os.IsExist(err) {
-		// hash matches existing upload
-		// That's fine - but still persist the metadata separately
-		shouldSave = false
-	} else if err != nil {
-		return "", err
-	}
 
-	if shouldSave {
+	// Save file to disk/s3
-		defer dest.Close()
+	err = this.SaveFile(context.Background(), fileHash, srcLen, src)
-
-		_, err = io.CopyN(dest, src, int64(srcLen))
 	if err != nil {
 		return "", err
 	}
-	}
 
 	// Determine mime type
 	ctype := hdr.Header.Get("Content-Type")