make cgofuse the default for "fs" only on windows. on linux and mac it needs a "cgofuse" build tag.

nostrfs/asyncfile.go

@@ -0,0 +1,56 @@
+package nostrfs
+
+import (
+	"context"
+	"sync/atomic"
+	"syscall"
+
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+	"fiatjaf.com/nostr"
+)
+
+type AsyncFile struct {
+	fs.Inode
+	ctx     context.Context
+	fetched atomic.Bool
+	data    []byte
+	ts      nostr.Timestamp
+	load    func() ([]byte, nostr.Timestamp)
+}
+
+var (
+	_ = (fs.NodeOpener)((*AsyncFile)(nil))
+	_ = (fs.NodeGetattrer)((*AsyncFile)(nil))
+)
+
+func (af *AsyncFile) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	if af.fetched.CompareAndSwap(false, true) {
+		af.data, af.ts = af.load()
+	}
+
+	out.Size = uint64(len(af.data))
+	out.Mtime = uint64(af.ts)
+	return fs.OK
+}
+
+func (af *AsyncFile) Open(ctx context.Context, flags uint32) (fs.FileHandle, uint32, syscall.Errno) {
+	if af.fetched.CompareAndSwap(false, true) {
+		af.data, af.ts = af.load()
+	}
+
+	return nil, fuse.FOPEN_KEEP_CACHE, 0
+}
+
+func (af *AsyncFile) Read(
+	ctx context.Context,
+	f fs.FileHandle,
+	dest []byte,
+	off int64,
+) (fuse.ReadResult, syscall.Errno) {
+	end := int(off) + len(dest)
+	if end > len(af.data) {
+		end = len(af.data)
+	}
+	return fuse.ReadResultData(af.data[off:end]), 0
+}

nostrfs/deterministicfile.go

@@ -0,0 +1,50 @@
+package nostrfs
+
+import (
+	"context"
+	"syscall"
+	"unsafe"
+
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type DeterministicFile struct {
+	fs.Inode
+	get func() (ctime, mtime uint64, data string)
+}
+
+var (
+	_ = (fs.NodeOpener)((*DeterministicFile)(nil))
+	_ = (fs.NodeReader)((*DeterministicFile)(nil))
+	_ = (fs.NodeGetattrer)((*DeterministicFile)(nil))
+)
+
+func (r *NostrRoot) NewDeterministicFile(get func() (ctime, mtime uint64, data string)) *DeterministicFile {
+	return &DeterministicFile{
+		get: get,
+	}
+}
+
+func (f *DeterministicFile) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+	return nil, fuse.FOPEN_KEEP_CACHE, fs.OK
+}
+
+func (f *DeterministicFile) Getattr(ctx context.Context, fh fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	var content string
+	out.Mode = 0444
+	out.Ctime, out.Mtime, content = f.get()
+	out.Size = uint64(len(content))
+	return fs.OK
+}
+
+func (f *DeterministicFile) Read(ctx context.Context, fh fs.FileHandle, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
+	_, _, content := f.get()
+	data := unsafe.Slice(unsafe.StringData(content), len(content))
+
+	end := int(off) + len(dest)
+	if end > len(data) {
+		end = len(data)
+	}
+	return fuse.ReadResultData(data[off:end]), fs.OK
+}

nostrfs/entitydir.go

@@ -0,0 +1,408 @@
+package nostrfs
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"fiatjaf.com/lib/debouncer"
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/nip19"
+	"fiatjaf.com/nostr/nip27"
+	"fiatjaf.com/nostr/nip73"
+	"fiatjaf.com/nostr/nip92"
+	sdk "fiatjaf.com/nostr/sdk"
+	"github.com/fatih/color"
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type EntityDir struct {
+	fs.Inode
+	root *NostrRoot
+
+	publisher *debouncer.Debouncer
+	event     *nostr.Event
+	updating  struct {
+		title       string
+		content     string
+		publishedAt uint64
+	}
+}
+
+var (
+	_ = (fs.NodeOnAdder)((*EntityDir)(nil))
+	_ = (fs.NodeGetattrer)((*EntityDir)(nil))
+	_ = (fs.NodeSetattrer)((*EntityDir)(nil))
+	_ = (fs.NodeCreater)((*EntityDir)(nil))
+	_ = (fs.NodeUnlinker)((*EntityDir)(nil))
+)
+
+func (e *EntityDir) Getattr(_ context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	out.Ctime = uint64(e.event.CreatedAt)
+	if e.updating.publishedAt != 0 {
+		out.Mtime = e.updating.publishedAt
+	} else {
+		out.Mtime = e.PublishedAt()
+	}
+	return fs.OK
+}
+
+func (e *EntityDir) Create(
+	_ context.Context,
+	name string,
+	flags uint32,
+	mode uint32,
+	out *fuse.EntryOut,
+) (node *fs.Inode, fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+	if name == "publish" && e.publisher.IsRunning() {
+		// this causes the publish process to be triggered faster
+		log := e.root.ctx.Value("log").(func(msg string, args ...any))
+		log("publishing now!\n")
+		e.publisher.Flush()
+		return nil, nil, 0, syscall.ENOTDIR
+	}
+
+	return nil, nil, 0, syscall.ENOTSUP
+}
+
+func (e *EntityDir) Unlink(ctx context.Context, name string) syscall.Errno {
+	switch name {
+	case "content" + kindToExtension(e.event.Kind):
+		e.updating.content = e.event.Content
+		return syscall.ENOTDIR
+	case "title":
+		e.updating.title = e.Title()
+		return syscall.ENOTDIR
+	default:
+		return syscall.EINTR
+	}
+}
+
+func (e *EntityDir) Setattr(_ context.Context, _ fs.FileHandle, in *fuse.SetAttrIn, _ *fuse.AttrOut) syscall.Errno {
+	e.updating.publishedAt = in.Mtime
+	return fs.OK
+}
+
+func (e *EntityDir) OnAdd(_ context.Context) {
+	log := e.root.ctx.Value("log").(func(msg string, args ...any))
+
+	e.AddChild("@author", e.NewPersistentInode(
+		e.root.ctx,
+		&fs.MemSymlink{
+			Data: []byte(e.root.wd + "/" + nip19.EncodeNpub(e.event.PubKey)),
+		},
+		fs.StableAttr{Mode: syscall.S_IFLNK},
+	), true)
+
+	e.AddChild("event.json", e.NewPersistentInode(
+		e.root.ctx,
+		&DeterministicFile{
+			get: func() (ctime uint64, mtime uint64, data string) {
+				eventj, _ := json.MarshalIndent(e.event, "", "  ")
+				return uint64(e.event.CreatedAt),
+					uint64(e.event.CreatedAt),
+					unsafe.String(unsafe.SliceData(eventj), len(eventj))
+			},
+		},
+		fs.StableAttr{},
+	), true)
+
+	e.AddChild("identifier", e.NewPersistentInode(
+		e.root.ctx,
+		&fs.MemRegularFile{
+			Data: []byte(e.event.Tags.GetD()),
+			Attr: fuse.Attr{
+				Mode:  0444,
+				Ctime: uint64(e.event.CreatedAt),
+				Mtime: uint64(e.event.CreatedAt),
+				Size:  uint64(len(e.event.Tags.GetD())),
+			},
+		},
+		fs.StableAttr{},
+	), true)
+
+	if e.root.signer == nil || e.root.rootPubKey != e.event.PubKey {
+		// read-only
+		e.AddChild("title", e.NewPersistentInode(
+			e.root.ctx,
+			&DeterministicFile{
+				get: func() (ctime uint64, mtime uint64, data string) {
+					return uint64(e.event.CreatedAt), e.PublishedAt(), e.Title()
+				},
+			},
+			fs.StableAttr{},
+		), true)
+		e.AddChild("content."+kindToExtension(e.event.Kind), e.NewPersistentInode(
+			e.root.ctx,
+			&DeterministicFile{
+				get: func() (ctime uint64, mtime uint64, data string) {
+					return uint64(e.event.CreatedAt), e.PublishedAt(), e.event.Content
+				},
+			},
+			fs.StableAttr{},
+		), true)
+	} else {
+		// writeable
+		e.updating.title = e.Title()
+		e.updating.publishedAt = e.PublishedAt()
+		e.updating.content = e.event.Content
+
+		e.AddChild("title", e.NewPersistentInode(
+			e.root.ctx,
+			e.root.NewWriteableFile(e.updating.title, uint64(e.event.CreatedAt), e.updating.publishedAt, func(s string) {
+				log("title updated")
+				e.updating.title = strings.TrimSpace(s)
+				e.handleWrite()
+			}),
+			fs.StableAttr{},
+		), true)
+
+		e.AddChild("content."+kindToExtension(e.event.Kind), e.NewPersistentInode(
+			e.root.ctx,
+			e.root.NewWriteableFile(e.updating.content, uint64(e.event.CreatedAt), e.updating.publishedAt, func(s string) {
+				log("content updated")
+				e.updating.content = strings.TrimSpace(s)
+				e.handleWrite()
+			}),
+			fs.StableAttr{},
+		), true)
+	}
+
+	var refsdir *fs.Inode
+	i := 0
+	for ref := range nip27.Parse(e.event.Content) {
+		if _, isExternal := ref.Pointer.(nip73.ExternalPointer); isExternal {
+			continue
+		}
+		i++
+
+		if refsdir == nil {
+			refsdir = e.NewPersistentInode(e.root.ctx, &fs.Inode{}, fs.StableAttr{Mode: syscall.S_IFDIR})
+			e.root.AddChild("references", refsdir, true)
+		}
+		refsdir.AddChild(fmt.Sprintf("ref_%02d", i), refsdir.NewPersistentInode(
+			e.root.ctx,
+			&fs.MemSymlink{
+				Data: []byte(e.root.wd + "/" + nip19.EncodePointer(ref.Pointer)),
+			},
+			fs.StableAttr{Mode: syscall.S_IFLNK},
+		), true)
+	}
+
+	var imagesdir *fs.Inode
+	addImage := func(url string) {
+		if imagesdir == nil {
+			in := &fs.Inode{}
+			imagesdir = e.NewPersistentInode(e.root.ctx, in, fs.StableAttr{Mode: syscall.S_IFDIR})
+			e.AddChild("images", imagesdir, true)
+		}
+		imagesdir.AddChild(filepath.Base(url), imagesdir.NewPersistentInode(
+			e.root.ctx,
+			&AsyncFile{
+				ctx: e.root.ctx,
+				load: func() ([]byte, nostr.Timestamp) {
+					ctx, cancel := context.WithTimeout(e.root.ctx, time.Second*20)
+					defer cancel()
+					r, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+					if err != nil {
+						log("failed to load image %s: %s\n", url, err)
+						return nil, 0
+					}
+					resp, err := http.DefaultClient.Do(r)
+					if err != nil {
+						log("failed to load image %s: %s\n", url, err)
+						return nil, 0
+					}
+					defer resp.Body.Close()
+					if resp.StatusCode >= 300 {
+						log("failed to load image %s: %s\n", url, err)
+						return nil, 0
+					}
+					w := &bytes.Buffer{}
+					io.Copy(w, resp.Body)
+					return w.Bytes(), 0
+				},
+			},
+			fs.StableAttr{},
+		), true)
+	}
+
+	images := nip92.ParseTags(e.event.Tags)
+	for _, imeta := range images {
+		if imeta.URL == "" {
+			continue
+		}
+		addImage(imeta.URL)
+	}
+
+	if tag := e.event.Tags.Find("image"); tag != nil {
+		addImage(tag[1])
+	}
+}
+
+func (e *EntityDir) IsNew() bool {
+	return e.event.CreatedAt == 0
+}
+
+func (e *EntityDir) PublishedAt() uint64 {
+	if tag := e.event.Tags.Find("published_at"); tag != nil {
+		publishedAt, _ := strconv.ParseUint(tag[1], 10, 64)
+		return publishedAt
+	}
+	return uint64(e.event.CreatedAt)
+}
+
+func (e *EntityDir) Title() string {
+	if tag := e.event.Tags.Find("title"); tag != nil {
+		return tag[1]
+	}
+	return ""
+}
+
+func (e *EntityDir) handleWrite() {
+	log := e.root.ctx.Value("log").(func(msg string, args ...any))
+	logverbose := e.root.ctx.Value("logverbose").(func(msg string, args ...any))
+
+	if e.root.opts.AutoPublishArticlesTimeout.Hours() < 24*365 {
+		if e.publisher.IsRunning() {
+			log(", timer reset")
+		}
+		log(", publishing the ")
+		if e.IsNew() {
+			log("new")
+		} else {
+			log("updated")
+		}
+		log(" event in %d seconds...\n", int(e.root.opts.AutoPublishArticlesTimeout.Seconds()))
+	} else {
+		log(".\n")
+	}
+	if !e.publisher.IsRunning() {
+		log("- `touch publish` to publish immediately\n")
+		log("- `rm title content." + kindToExtension(e.event.Kind) + "` to erase and cancel the edits\n")
+	}
+
+	e.publisher.Call(func() {
+		if e.Title() == e.updating.title && e.event.Content == e.updating.content {
+			log("not modified, publish canceled.\n")
+			return
+		}
+
+		evt := nostr.Event{
+			Kind:      e.event.Kind,
+			Content:   e.updating.content,
+			Tags:      make(nostr.Tags, len(e.event.Tags)),
+			CreatedAt: nostr.Now(),
+		}
+		copy(evt.Tags, e.event.Tags) // copy tags because that's the rule
+		if e.updating.title != "" {
+			if titleTag := evt.Tags.Find("title"); titleTag != nil {
+				titleTag[1] = e.updating.title
+			} else {
+				evt.Tags = append(evt.Tags, nostr.Tag{"title", e.updating.title})
+			}
+		}
+
+		// "published_at" tag
+		publishedAtStr := strconv.FormatUint(e.updating.publishedAt, 10)
+		if publishedAtStr != "0" {
+			if publishedAtTag := evt.Tags.Find("published_at"); publishedAtTag != nil {
+				publishedAtTag[1] = publishedAtStr
+			} else {
+				evt.Tags = append(evt.Tags, nostr.Tag{"published_at", publishedAtStr})
+			}
+		}
+
+		// add "p" tags from people mentioned and "q" tags from events mentioned
+		for ref := range nip27.Parse(evt.Content) {
+			if _, isExternal := ref.Pointer.(nip73.ExternalPointer); isExternal {
+				continue
+			}
+
+			tag := ref.Pointer.AsTag()
+			key := tag[0]
+			val := tag[1]
+			if key == "e" || key == "a" {
+				key = "q"
+			}
+			if existing := evt.Tags.FindWithValue(key, val); existing == nil {
+				evt.Tags = append(evt.Tags, tag)
+			}
+		}
+
+		// sign and publish
+		if err := e.root.signer.SignEvent(e.root.ctx, &evt); err != nil {
+			log("failed to sign: '%s'.\n", err)
+			return
+		}
+		logverbose("%s\n", evt)
+
+		relays := e.root.sys.FetchWriteRelays(e.root.ctx, e.root.rootPubKey)
+		if len(relays) == 0 {
+			relays = e.root.sys.FetchOutboxRelays(e.root.ctx, e.root.rootPubKey, 6)
+		}
+
+		log("publishing to %d relays... ", len(relays))
+		success := false
+		first := true
+		for res := range e.root.sys.Pool.PublishMany(e.root.ctx, relays, evt) {
+			cleanUrl, _ := strings.CutPrefix(res.RelayURL, "wss://")
+			if !first {
+				log(", ")
+			}
+			first = false
+
+			if res.Error != nil {
+				log("%s: %s", color.RedString(cleanUrl), res.Error)
+			} else {
+				success = true
+				log("%s: ok", color.GreenString(cleanUrl))
+			}
+		}
+		log("\n")
+
+		if success {
+			e.event = &evt
+			log("event updated locally.\n")
+			e.updating.publishedAt = uint64(evt.CreatedAt) // set this so subsequent edits get the correct value
+		} else {
+			log("failed.\n")
+		}
+	})
+}
+
+func (r *NostrRoot) FetchAndCreateEntityDir(
+	parent fs.InodeEmbedder,
+	extension string,
+	pointer nostr.EntityPointer,
+) (*fs.Inode, error) {
+	event, _, err := r.sys.FetchSpecificEvent(r.ctx, pointer, sdk.FetchSpecificEventParameters{
+		WithRelays: false,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch: %w", err)
+	}
+
+	return r.CreateEntityDir(parent, event), nil
+}
+
+func (r *NostrRoot) CreateEntityDir(
+	parent fs.InodeEmbedder,
+	event *nostr.Event,
+) *fs.Inode {
+	return parent.EmbeddedInode().NewPersistentInode(
+		r.ctx,
+		&EntityDir{root: r, event: event, publisher: debouncer.New(r.opts.AutoPublishArticlesTimeout)},
+		fs.StableAttr{Mode: syscall.S_IFDIR},
+	)
+}

nostrfs/eventdir.go

@@ -0,0 +1,241 @@
+package nostrfs
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/nip10"
+	"fiatjaf.com/nostr/nip19"
+	"fiatjaf.com/nostr/nip22"
+	"fiatjaf.com/nostr/nip27"
+	"fiatjaf.com/nostr/nip73"
+	"fiatjaf.com/nostr/nip92"
+	sdk "fiatjaf.com/nostr/sdk"
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type EventDir struct {
+	fs.Inode
+	ctx context.Context
+	wd  string
+	evt *nostr.Event
+}
+
+var _ = (fs.NodeGetattrer)((*EventDir)(nil))
+
+func (e *EventDir) Getattr(_ context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	out.Mtime = uint64(e.evt.CreatedAt)
+	return fs.OK
+}
+
+func (r *NostrRoot) FetchAndCreateEventDir(
+	parent fs.InodeEmbedder,
+	pointer nostr.EventPointer,
+) (*fs.Inode, error) {
+	event, _, err := r.sys.FetchSpecificEvent(r.ctx, pointer, sdk.FetchSpecificEventParameters{
+		WithRelays: false,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch: %w", err)
+	}
+
+	return r.CreateEventDir(parent, event), nil
+}
+
+func (r *NostrRoot) CreateEventDir(
+	parent fs.InodeEmbedder,
+	event *nostr.Event,
+) *fs.Inode {
+	h := parent.EmbeddedInode().NewPersistentInode(
+		r.ctx,
+		&EventDir{ctx: r.ctx, wd: r.wd, evt: event},
+		fs.StableAttr{Mode: syscall.S_IFDIR, Ino: binary.BigEndian.Uint64(event.ID[8:16])},
+	)
+
+	h.AddChild("@author", h.NewPersistentInode(
+		r.ctx,
+		&fs.MemSymlink{
+			Data: []byte(r.wd + "/" + nip19.EncodeNpub(event.PubKey)),
+		},
+		fs.StableAttr{Mode: syscall.S_IFLNK},
+	), true)
+
+	eventj, _ := json.MarshalIndent(event, "", "  ")
+	h.AddChild("event.json", h.NewPersistentInode(
+		r.ctx,
+		&fs.MemRegularFile{
+			Data: eventj,
+			Attr: fuse.Attr{
+				Mode:  0444,
+				Ctime: uint64(event.CreatedAt),
+				Mtime: uint64(event.CreatedAt),
+				Size:  uint64(len(event.Content)),
+			},
+		},
+		fs.StableAttr{},
+	), true)
+
+	h.AddChild("id", h.NewPersistentInode(
+		r.ctx,
+		&fs.MemRegularFile{
+			Data: []byte(event.ID.Hex()),
+			Attr: fuse.Attr{
+				Mode:  0444,
+				Ctime: uint64(event.CreatedAt),
+				Mtime: uint64(event.CreatedAt),
+				Size:  uint64(64),
+			},
+		},
+		fs.StableAttr{},
+	), true)
+
+	h.AddChild("content.txt", h.NewPersistentInode(
+		r.ctx,
+		&fs.MemRegularFile{
+			Data: []byte(event.Content),
+			Attr: fuse.Attr{
+				Mode:  0444,
+				Ctime: uint64(event.CreatedAt),
+				Mtime: uint64(event.CreatedAt),
+				Size:  uint64(len(event.Content)),
+			},
+		},
+		fs.StableAttr{},
+	), true)
+
+	var refsdir *fs.Inode
+	i := 0
+	for ref := range nip27.Parse(event.Content) {
+		if _, isExternal := ref.Pointer.(nip73.ExternalPointer); isExternal {
+			continue
+		}
+		i++
+
+		if refsdir == nil {
+			refsdir = h.NewPersistentInode(r.ctx, &fs.Inode{}, fs.StableAttr{Mode: syscall.S_IFDIR})
+			h.AddChild("references", refsdir, true)
+		}
+		refsdir.AddChild(fmt.Sprintf("ref_%02d", i), refsdir.NewPersistentInode(
+			r.ctx,
+			&fs.MemSymlink{
+				Data: []byte(r.wd + "/" + nip19.EncodePointer(ref.Pointer)),
+			},
+			fs.StableAttr{Mode: syscall.S_IFLNK},
+		), true)
+	}
+
+	var imagesdir *fs.Inode
+	images := nip92.ParseTags(event.Tags)
+	for _, imeta := range images {
+		if imeta.URL == "" {
+			continue
+		}
+		if imagesdir == nil {
+			in := &fs.Inode{}
+			imagesdir = h.NewPersistentInode(r.ctx, in, fs.StableAttr{Mode: syscall.S_IFDIR})
+			h.AddChild("images", imagesdir, true)
+		}
+		imagesdir.AddChild(filepath.Base(imeta.URL), imagesdir.NewPersistentInode(
+			r.ctx,
+			&AsyncFile{
+				ctx: r.ctx,
+				load: func() ([]byte, nostr.Timestamp) {
+					ctx, cancel := context.WithTimeout(r.ctx, time.Second*20)
+					defer cancel()
+					r, err := http.NewRequestWithContext(ctx, "GET", imeta.URL, nil)
+					if err != nil {
+						return nil, 0
+					}
+					resp, err := http.DefaultClient.Do(r)
+					if err != nil {
+						return nil, 0
+					}
+					defer resp.Body.Close()
+					if resp.StatusCode >= 300 {
+						return nil, 0
+					}
+					w := &bytes.Buffer{}
+					io.Copy(w, resp.Body)
+					return w.Bytes(), 0
+				},
+			},
+			fs.StableAttr{},
+		), true)
+	}
+
+	if event.Kind == 1 {
+		if pointer := nip10.GetThreadRoot(event.Tags); pointer != nil {
+			nevent := nip19.EncodePointer(pointer)
+			h.AddChild("@root", h.NewPersistentInode(
+				r.ctx,
+				&fs.MemSymlink{
+					Data: []byte(r.wd + "/" + nevent),
+				},
+				fs.StableAttr{Mode: syscall.S_IFLNK},
+			), true)
+		}
+		if pointer := nip10.GetImmediateParent(event.Tags); pointer != nil {
+			nevent := nip19.EncodePointer(pointer)
+			h.AddChild("@parent", h.NewPersistentInode(
+				r.ctx,
+				&fs.MemSymlink{
+					Data: []byte(r.wd + "/" + nevent),
+				},
+				fs.StableAttr{Mode: syscall.S_IFLNK},
+			), true)
+		}
+	} else if event.Kind == 1111 {
+		if pointer := nip22.GetThreadRoot(event.Tags); pointer != nil {
+			if xp, ok := pointer.(nip73.ExternalPointer); ok {
+				h.AddChild("@root", h.NewPersistentInode(
+					r.ctx,
+					&fs.MemRegularFile{
+						Data: []byte(`<!doctype html><meta http-equiv="refresh" content="0; url=` + xp.Thing + `" />`),
+					},
+					fs.StableAttr{},
+				), true)
+			} else {
+				nevent := nip19.EncodePointer(pointer)
+				h.AddChild("@parent", h.NewPersistentInode(
+					r.ctx,
+					&fs.MemSymlink{
+						Data: []byte(r.wd + "/" + nevent),
+					},
+					fs.StableAttr{Mode: syscall.S_IFLNK},
+				), true)
+			}
+		}
+		if pointer := nip22.GetImmediateParent(event.Tags); pointer != nil {
+			if xp, ok := pointer.(nip73.ExternalPointer); ok {
+				h.AddChild("@parent", h.NewPersistentInode(
+					r.ctx,
+					&fs.MemRegularFile{
+						Data: []byte(`<!doctype html><meta http-equiv="refresh" content="0; url=` + xp.Thing + `" />`),
+					},
+					fs.StableAttr{},
+				), true)
+			} else {
+				nevent := nip19.EncodePointer(pointer)
+				h.AddChild("@parent", h.NewPersistentInode(
+					r.ctx,
+					&fs.MemSymlink{
+						Data: []byte(r.wd + "/" + nevent),
+					},
+					fs.StableAttr{Mode: syscall.S_IFLNK},
+				), true)
+			}
+		}
+	}
+
+	return h
+}

nostrfs/helpers.go

@@ -0,0 +1,16 @@
+package nostrfs
+
+import (
+	"fiatjaf.com/nostr"
+)
+
+func kindToExtension(kind nostr.Kind) string {
+	switch kind {
+	case 30023:
+		return "md"
+	case 30818:
+		return "adoc"
+	default:
+		return "txt"
+	}
+}

nostrfs/npubdir.go

@@ -0,0 +1,261 @@
+package nostrfs
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"encoding/json"
+	"io"
+	"net/http"
+	"sync/atomic"
+	"syscall"
+	"time"
+
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/nip19"
+	"github.com/fatih/color"
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+	"github.com/liamg/magic"
+)
+
+type NpubDir struct {
+	fs.Inode
+	root    *NostrRoot
+	pointer nostr.ProfilePointer
+	fetched atomic.Bool
+}
+
+var _ = (fs.NodeOnAdder)((*NpubDir)(nil))
+
+func (r *NostrRoot) CreateNpubDir(
+	parent fs.InodeEmbedder,
+	pointer nostr.ProfilePointer,
+	signer nostr.Signer,
+) *fs.Inode {
+	npubdir := &NpubDir{root: r, pointer: pointer}
+	return parent.EmbeddedInode().NewPersistentInode(
+		r.ctx,
+		npubdir,
+		fs.StableAttr{Mode: syscall.S_IFDIR, Ino: binary.BigEndian.Uint64(pointer.PublicKey[8:16])},
+	)
+}
+
+func (h *NpubDir) OnAdd(_ context.Context) {
+	log := h.root.ctx.Value("log").(func(msg string, args ...any))
+
+	relays := h.root.sys.FetchOutboxRelays(h.root.ctx, h.pointer.PublicKey, 2)
+	log("- adding folder for %s with relays %s\n",
+		color.HiYellowString(nip19.EncodePointer(h.pointer)), color.HiGreenString("%v", relays))
+
+	h.AddChild("pubkey", h.NewPersistentInode(
+		h.root.ctx,
+		&fs.MemRegularFile{Data: []byte(h.pointer.PublicKey.Hex() + "\n"), Attr: fuse.Attr{Mode: 0444}},
+		fs.StableAttr{},
+	), true)
+
+	go func() {
+		pm := h.root.sys.FetchProfileMetadata(h.root.ctx, h.pointer.PublicKey)
+		if pm.Event == nil {
+			return
+		}
+
+		metadataj, _ := json.MarshalIndent(pm, "", "  ")
+		h.AddChild(
+			"metadata.json",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&fs.MemRegularFile{
+					Data: metadataj,
+					Attr: fuse.Attr{
+						Mtime: uint64(pm.Event.CreatedAt),
+						Mode:  0444,
+					},
+				},
+				fs.StableAttr{},
+			),
+			true,
+		)
+
+		ctx, cancel := context.WithTimeout(h.root.ctx, time.Second*20)
+		defer cancel()
+		req, err := http.NewRequestWithContext(ctx, "GET", pm.Picture, nil)
+		if err == nil {
+			resp, err := http.DefaultClient.Do(req)
+			if err == nil {
+				defer resp.Body.Close()
+				if resp.StatusCode < 300 {
+					b := &bytes.Buffer{}
+					io.Copy(b, resp.Body)
+
+					ext := "png"
+					if ft, err := magic.Lookup(b.Bytes()); err == nil {
+						ext = ft.Extension
+					}
+
+					h.AddChild("picture."+ext, h.NewPersistentInode(
+						ctx,
+						&fs.MemRegularFile{
+							Data: b.Bytes(),
+							Attr: fuse.Attr{
+								Mtime: uint64(pm.Event.CreatedAt),
+								Mode:  0444,
+							},
+						},
+						fs.StableAttr{},
+					), true)
+				}
+			}
+		}
+	}()
+
+	if h.GetChild("notes") == nil {
+		h.AddChild(
+			"notes",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{1},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    true,
+					relays:      relays,
+					replaceable: false,
+					createable:  true,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+
+	if h.GetChild("comments") == nil {
+		h.AddChild(
+			"comments",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{1111},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    true,
+					relays:      relays,
+					replaceable: false,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+
+	if h.GetChild("photos") == nil {
+		h.AddChild(
+			"photos",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{20},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    true,
+					relays:      relays,
+					replaceable: false,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+
+	if h.GetChild("videos") == nil {
+		h.AddChild(
+			"videos",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{21, 22},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    false,
+					relays:      relays,
+					replaceable: false,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+
+	if h.GetChild("highlights") == nil {
+		h.AddChild(
+			"highlights",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{9802},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    false,
+					relays:      relays,
+					replaceable: false,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+
+	if h.GetChild("articles") == nil {
+		h.AddChild(
+			"articles",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{30023},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    false,
+					relays:      relays,
+					replaceable: true,
+					createable:  true,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+
+	if h.GetChild("wiki") == nil {
+		h.AddChild(
+			"wiki",
+			h.NewPersistentInode(
+				h.root.ctx,
+				&ViewDir{
+					root: h.root,
+					filter: nostr.Filter{
+						Kinds:   []nostr.Kind{30818},
+						Authors: []nostr.PubKey{h.pointer.PublicKey},
+					},
+					paginate:    false,
+					relays:      relays,
+					replaceable: true,
+					createable:  true,
+				},
+				fs.StableAttr{Mode: syscall.S_IFDIR},
+			),
+			true,
+		)
+	}
+}

nostrfs/root.go

@@ -0,0 +1,130 @@
+package nostrfs
+
+import (
+	"context"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/nip05"
+	"fiatjaf.com/nostr/nip19"
+	"fiatjaf.com/nostr/sdk"
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type Options struct {
+	AutoPublishNotesTimeout    time.Duration
+	AutoPublishArticlesTimeout time.Duration
+}
+
+type NostrRoot struct {
+	fs.Inode
+
+	ctx        context.Context
+	wd         string
+	sys        *sdk.System
+	rootPubKey nostr.PubKey
+	signer     nostr.Signer
+
+	opts Options
+}
+
+var _ = (fs.NodeOnAdder)((*NostrRoot)(nil))
+
+func NewNostrRoot(ctx context.Context, sys *sdk.System, user nostr.User, mountpoint string, o Options) *NostrRoot {
+	pubkey, _ := user.GetPublicKey(ctx)
+	abs, _ := filepath.Abs(mountpoint)
+
+	var signer nostr.Signer
+	if user != nil {
+		signer, _ = user.(nostr.Signer)
+	}
+
+	return &NostrRoot{
+		ctx:        ctx,
+		sys:        sys,
+		rootPubKey: pubkey,
+		signer:     signer,
+		wd:         abs,
+
+		opts: o,
+	}
+}
+
+func (r *NostrRoot) OnAdd(_ context.Context) {
+	if r.rootPubKey == nostr.ZeroPK {
+		return
+	}
+
+	go func() {
+		time.Sleep(time.Millisecond * 100)
+
+		// add our contacts
+		fl := r.sys.FetchFollowList(r.ctx, r.rootPubKey)
+		for _, f := range fl.Items {
+			pointer := nostr.ProfilePointer{PublicKey: f.Pubkey, Relays: []string{f.Relay}}
+			r.AddChild(
+				nip19.EncodeNpub(f.Pubkey),
+				r.CreateNpubDir(r, pointer, nil),
+				true,
+			)
+		}
+
+		// add ourselves
+		npub := nip19.EncodeNpub(r.rootPubKey)
+		if r.GetChild(npub) == nil {
+			pointer := nostr.ProfilePointer{PublicKey: r.rootPubKey}
+
+			r.AddChild(
+				npub,
+				r.CreateNpubDir(r, pointer, r.signer),
+				true,
+			)
+		}
+
+		// add a link to ourselves
+		r.AddChild("@me", r.NewPersistentInode(
+			r.ctx,
+			&fs.MemSymlink{Data: []byte(r.wd + "/" + npub)},
+			fs.StableAttr{Mode: syscall.S_IFLNK},
+		), true)
+	}()
+}
+
+func (r *NostrRoot) Lookup(_ context.Context, name string, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
+	out.SetEntryTimeout(time.Minute * 5)
+
+	child := r.GetChild(name)
+	if child != nil {
+		return child, fs.OK
+	}
+
+	if pp, err := nip05.QueryIdentifier(r.ctx, name); err == nil {
+		return r.NewPersistentInode(
+			r.ctx,
+			&fs.MemSymlink{Data: []byte(r.wd + "/" + nip19.EncodePointer(*pp))},
+			fs.StableAttr{Mode: syscall.S_IFLNK},
+		), fs.OK
+	}
+
+	pointer, err := nip19.ToPointer(name)
+	if err != nil {
+		return nil, syscall.ENOENT
+	}
+
+	switch p := pointer.(type) {
+	case nostr.ProfilePointer:
+		npubdir := r.CreateNpubDir(r, p, nil)
+		return npubdir, fs.OK
+	case nostr.EventPointer:
+		eventdir, err := r.FetchAndCreateEventDir(r, p)
+		if err != nil {
+			return nil, syscall.ENOENT
+		}
+		return eventdir, fs.OK
+	default:
+		return nil, syscall.ENOENT
+	}
+}

nostrfs/viewdir.go

@@ -0,0 +1,267 @@
+package nostrfs
+
+import (
+	"context"
+	"strings"
+	"sync/atomic"
+	"syscall"
+
+	"fiatjaf.com/lib/debouncer"
+	"fiatjaf.com/nostr"
+	"github.com/fatih/color"
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type ViewDir struct {
+	fs.Inode
+	root        *NostrRoot
+	fetched     atomic.Bool
+	filter      nostr.Filter
+	paginate    bool
+	relays      []string
+	replaceable bool
+	createable  bool
+	publisher   *debouncer.Debouncer
+	publishing  struct {
+		note string
+	}
+}
+
+var (
+	_ = (fs.NodeOpendirer)((*ViewDir)(nil))
+	_ = (fs.NodeGetattrer)((*ViewDir)(nil))
+	_ = (fs.NodeMkdirer)((*ViewDir)(nil))
+	_ = (fs.NodeSetattrer)((*ViewDir)(nil))
+	_ = (fs.NodeCreater)((*ViewDir)(nil))
+	_ = (fs.NodeUnlinker)((*ViewDir)(nil))
+)
+
+func (f *ViewDir) Setattr(_ context.Context, _ fs.FileHandle, _ *fuse.SetAttrIn, _ *fuse.AttrOut) syscall.Errno {
+	return fs.OK
+}
+
+func (n *ViewDir) Create(
+	_ context.Context,
+	name string,
+	flags uint32,
+	mode uint32,
+	out *fuse.EntryOut,
+) (node *fs.Inode, fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+	if !n.createable || n.root.rootPubKey != n.filter.Authors[0] {
+		return nil, nil, 0, syscall.EPERM
+	}
+	if n.publisher == nil {
+		n.publisher = debouncer.New(n.root.opts.AutoPublishNotesTimeout)
+	}
+	if n.filter.Kinds[0] != 1 {
+		return nil, nil, 0, syscall.ENOTSUP
+	}
+
+	switch name {
+	case "new":
+		log := n.root.ctx.Value("log").(func(msg string, args ...any))
+
+		if n.publisher.IsRunning() {
+			log("pending note updated, timer reset.")
+		} else {
+			log("new note detected")
+			if n.root.opts.AutoPublishNotesTimeout.Hours() < 24*365 {
+				log(", publishing it in %d seconds...\n", int(n.root.opts.AutoPublishNotesTimeout.Seconds()))
+			} else {
+				log(".\n")
+			}
+			log("- `touch publish` to publish immediately\n")
+			log("- `rm new` to erase and cancel the publication.\n")
+		}
+
+		n.publisher.Call(n.publishNote)
+
+		first := true
+
+		return n.NewPersistentInode(
+			n.root.ctx,
+			n.root.NewWriteableFile(n.publishing.note, uint64(nostr.Now()), uint64(nostr.Now()), func(s string) {
+				if !first {
+					log("pending note updated, timer reset.\n")
+				}
+				first = false
+				n.publishing.note = strings.TrimSpace(s)
+				n.publisher.Call(n.publishNote)
+			}),
+			fs.StableAttr{},
+		), nil, 0, fs.OK
+	case "publish":
+		if n.publisher.IsRunning() {
+			// this causes the publish process to be triggered faster
+			log := n.root.ctx.Value("log").(func(msg string, args ...any))
+			log("publishing now!\n")
+			n.publisher.Flush()
+			return nil, nil, 0, syscall.ENOTDIR
+		}
+	}
+
+	return nil, nil, 0, syscall.ENOTSUP
+}
+
+func (n *ViewDir) Unlink(ctx context.Context, name string) syscall.Errno {
+	if !n.createable || n.root.rootPubKey != n.filter.Authors[0] {
+		return syscall.EPERM
+	}
+	if n.publisher == nil {
+		n.publisher = debouncer.New(n.root.opts.AutoPublishNotesTimeout)
+	}
+	if n.filter.Kinds[0] != 1 {
+		return syscall.ENOTSUP
+	}
+
+	switch name {
+	case "new":
+		log := n.root.ctx.Value("log").(func(msg string, args ...any))
+		log("publishing canceled.\n")
+		n.publisher.Stop()
+		n.publishing.note = ""
+		return fs.OK
+	}
+
+	return syscall.ENOTSUP
+}
+
+func (n *ViewDir) publishNote() {
+	log := n.root.ctx.Value("log").(func(msg string, args ...any))
+
+	log("publishing note...\n")
+	evt := nostr.Event{
+		Kind:      1,
+		CreatedAt: nostr.Now(),
+		Content:   n.publishing.note,
+		Tags:      make(nostr.Tags, 0, 2),
+	}
+
+	// our write relays
+	relays := n.root.sys.FetchWriteRelays(n.root.ctx, n.root.rootPubKey)
+	if len(relays) == 0 {
+		relays = n.root.sys.FetchOutboxRelays(n.root.ctx, n.root.rootPubKey, 6)
+	}
+
+	// massage and extract tags from raw text
+	targetRelays := n.root.sys.PrepareNoteEvent(n.root.ctx, &evt)
+	relays = nostr.AppendUnique(relays, targetRelays...)
+
+	// sign and publish
+	if err := n.root.signer.SignEvent(n.root.ctx, &evt); err != nil {
+		log("failed to sign: %s\n", err)
+		return
+	}
+	log(evt.String() + "\n")
+
+	log("publishing to %d relays... ", len(relays))
+	success := false
+	first := true
+	for res := range n.root.sys.Pool.PublishMany(n.root.ctx, relays, evt) {
+		cleanUrl, _ := strings.CutPrefix(res.RelayURL, "wss://")
+		if !first {
+			log(", ")
+		}
+		first = false
+
+		if res.Error != nil {
+			log("%s: %s", color.RedString(cleanUrl), res.Error)
+		} else {
+			success = true
+			log("%s: ok", color.GreenString(cleanUrl))
+		}
+	}
+	log("\n")
+
+	if success {
+		n.RmChild("new")
+		n.AddChild(evt.ID.Hex(), n.root.CreateEventDir(n, &evt), true)
+		log("event published as %s and updated locally.\n", color.BlueString(evt.ID.Hex()))
+	}
+}
+
+func (n *ViewDir) Getattr(_ context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	now := nostr.Now()
+	if n.filter.Until != 0 {
+		now = n.filter.Until
+	}
+	aMonthAgo := now - 30*24*60*60
+	out.Mtime = uint64(aMonthAgo)
+
+	return fs.OK
+}
+
+func (n *ViewDir) Opendir(ctx context.Context) syscall.Errno {
+	if n.fetched.CompareAndSwap(true, true) {
+		return fs.OK
+	}
+
+	if n.paginate {
+		now := nostr.Now()
+		if n.filter.Until != 0 {
+			now = n.filter.Until
+		}
+		aMonthAgo := now - 30*24*60*60
+		n.filter.Since = aMonthAgo
+
+		filter := n.filter
+		filter.Until = aMonthAgo
+
+		n.AddChild("@previous", n.NewPersistentInode(
+			n.root.ctx,
+			&ViewDir{
+				root:        n.root,
+				filter:      filter,
+				relays:      n.relays,
+				replaceable: n.replaceable,
+			},
+			fs.StableAttr{Mode: syscall.S_IFDIR},
+		), true)
+	}
+
+	if n.replaceable {
+		for rkey, evt := range n.root.sys.Pool.FetchManyReplaceable(n.root.ctx, n.relays, n.filter, nostr.SubscriptionOptions{
+			Label: "nakfs",
+		}).Range {
+			name := rkey.D
+			if name == "" {
+				name = "_"
+			}
+			if n.GetChild(name) == nil {
+				n.AddChild(name, n.root.CreateEntityDir(n, &evt), true)
+			}
+		}
+	} else {
+		for ie := range n.root.sys.Pool.FetchMany(n.root.ctx, n.relays, n.filter,
+			nostr.SubscriptionOptions{
+				Label: "nakfs",
+			}) {
+			if n.GetChild(ie.Event.ID.Hex()) == nil {
+				n.AddChild(ie.Event.ID.Hex(), n.root.CreateEventDir(n, &ie.Event), true)
+			}
+		}
+	}
+
+	return fs.OK
+}
+
+func (n *ViewDir) Mkdir(ctx context.Context, name string, mode uint32, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
+	if !n.createable || n.root.signer == nil || n.root.rootPubKey != n.filter.Authors[0] {
+		return nil, syscall.ENOTSUP
+	}
+
+	if n.replaceable {
+		// create a template event that can later be modified and published as new
+		return n.root.CreateEntityDir(n, &nostr.Event{
+			PubKey:    n.root.rootPubKey,
+			CreatedAt: 0,
+			Kind:      n.filter.Kinds[0],
+			Tags: nostr.Tags{
+				nostr.Tag{"d", name},
+			},
+		}), fs.OK
+	}
+
+	return nil, syscall.ENOTSUP
+}

nostrfs/writeablefile.go

@@ -0,0 +1,93 @@
+package nostrfs
+
+import (
+	"context"
+	"sync"
+	"syscall"
+
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type WriteableFile struct {
+	fs.Inode
+	root    *NostrRoot
+	mu      sync.Mutex
+	data    []byte
+	attr    fuse.Attr
+	onWrite func(string)
+}
+
+var (
+	_ = (fs.NodeOpener)((*WriteableFile)(nil))
+	_ = (fs.NodeReader)((*WriteableFile)(nil))
+	_ = (fs.NodeWriter)((*WriteableFile)(nil))
+	_ = (fs.NodeGetattrer)((*WriteableFile)(nil))
+	_ = (fs.NodeSetattrer)((*WriteableFile)(nil))
+	_ = (fs.NodeFlusher)((*WriteableFile)(nil))
+)
+
+func (r *NostrRoot) NewWriteableFile(data string, ctime, mtime uint64, onWrite func(string)) *WriteableFile {
+	return &WriteableFile{
+		root: r,
+		data: []byte(data),
+		attr: fuse.Attr{
+			Mode:  0666,
+			Ctime: ctime,
+			Mtime: mtime,
+			Size:  uint64(len(data)),
+		},
+		onWrite: onWrite,
+	}
+}
+
+func (f *WriteableFile) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+	return nil, fuse.FOPEN_KEEP_CACHE, fs.OK
+}
+
+func (f *WriteableFile) Write(ctx context.Context, fh fs.FileHandle, data []byte, off int64) (uint32, syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
+	offset := int(off)
+	end := offset + len(data)
+	if len(f.data) < end {
+		newData := make([]byte, offset+len(data))
+		copy(newData, f.data)
+		f.data = newData
+	}
+	copy(f.data[offset:], data)
+	f.data = f.data[0:end]
+
+	f.onWrite(string(f.data))
+	return uint32(len(data)), fs.OK
+}
+
+func (f *WriteableFile) Getattr(ctx context.Context, fh fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	out.Attr = f.attr
+	out.Attr.Size = uint64(len(f.data))
+	return fs.OK
+}
+
+func (f *WriteableFile) Setattr(_ context.Context, _ fs.FileHandle, in *fuse.SetAttrIn, _ *fuse.AttrOut) syscall.Errno {
+	f.attr.Mtime = in.Mtime
+	f.attr.Atime = in.Atime
+	f.attr.Ctime = in.Ctime
+	return fs.OK
+}
+
+func (f *WriteableFile) Flush(ctx context.Context, fh fs.FileHandle) syscall.Errno {
+	return fs.OK
+}
+
+func (f *WriteableFile) Read(ctx context.Context, fh fs.FileHandle, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	end := int(off) + len(dest)
+	if end > len(f.data) {
+		end = len(f.data)
+	}
+	return fuse.ReadResultData(f.data[off:end]), fs.OK
+}