Initial commit

- Basic go.mod and main
- Simple appview and lexicon setup
- Serve index.html page

.gitignore

···
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Code coverage profiles and other test artifacts
+*.out
+coverage.*
+*.coverprofile
+profile.cov
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env
+.envrc
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Editor/IDE
+.idea/
+.vscode/
+
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/

README.md

···
+# ATyo 
+
+Experimenting with AT Protocol to hit up your friends

api/api.go

···
+//go:generate go run ../gen
+//go:generate lexgen --build-file lexicons.json ../lexicons
+
+// NOTE: generating a new lexicon for the first time requires a bit of a dance
+// to comment the generated code requiring MarshalCBOR:
+// https://github.com/bluesky-social/indigo/pull/716
+
+package api

api/atyo/atyoping.go

···
+// Code generated by cmd/lexgen (see Makefile's lexgen); DO NOT EDIT.
+
+package atyo
+
+// schema: app.atyo.ping
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/bluesky-social/indigo/lex/util"
+)
+
+func init() {
+	util.RegisterType("app.atyo.ping", &Ping{})
+} //
+// RECORDTYPE: Ping
+type Ping struct {
+	LexiconTypeID string `json:"$type,const=app.atyo.ping" cborgen:"$type,const=app.atyo.ping"`
+	// contents: A message encrypted for a specific recipient, possibly including an encrypted payload. After decryption, this will deserialize from CBOR / JSON as `app.atyo.ping#contents`.
+	Contents util.LexBytes `json:"contents,omitempty" cborgen:"contents,omitempty"`
+	// createdAt: The time of record creation.
+	CreatedAt string `json:"createdAt" cborgen:"createdAt"`
+	// nonce: Random number used to encrypt the message contents
+	Nonce util.LexBytes `json:"nonce,omitempty" cborgen:"nonce,omitempty"`
+	// pubKey: One-time key used to encrypt the message contents
+	PubKey util.LexBytes `json:"pubKey,omitempty" cborgen:"pubKey,omitempty"`
+	// targets: The one-time private key to decrypt `contents`, which has been encrypted for each recipient.
+	Targets util.LexBytes `json:"targets,omitempty" cborgen:"targets,omitempty"`
+}
+
+// Ping_Contents is a "contents" in the app.atyo.ping schema.
+//
+// A message intended for another user.
+type Ping_Contents struct {
+	Ping_Empty *Ping_Empty
+}
+
+func (t *Ping_Contents) MarshalJSON() ([]byte, error) {
+	if t.Ping_Empty != nil {
+		t.Ping_Empty.LexiconTypeID = "app.atyo.ping#empty"
+		return json.Marshal(t.Ping_Empty)
+	}
+	return nil, fmt.Errorf("cannot marshal empty enum")
+}
+func (t *Ping_Contents) UnmarshalJSON(b []byte) error {
+	typ, err := util.TypeExtract(b)
+	if err != nil {
+		return err
+	}
+
+	switch typ {
+	case "app.atyo.ping#empty":
+		t.Ping_Empty = new(Ping_Empty)
+		return json.Unmarshal(b, t.Ping_Empty)
+
+	default:
+		return nil
+	}
+}
+
+// Ping_Empty is a "empty" in the app.atyo.ping schema.
+//
+// # An empty ping
+//
+// RECORDTYPE: Ping_Empty
+type Ping_Empty struct {
+	LexiconTypeID string `json:"$type,const=app.atyo.ping#empty" cborgen:"$type,const=app.atyo.ping#empty"`
+}
+
+// Ping_Location is a "location" in the app.atyo.ping schema.
+//
+// TODO: a ping marked with a location, i.e. @yo
+type Ping_Location struct {
+}

api/atyo/cbor_gen.go

···
+// Code generated by github.com/whyrusleeping/cbor-gen. DO NOT EDIT.
+
+package atyo
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"sort"
+
+	cid "github.com/ipfs/go-cid"
+	cbg "github.com/whyrusleeping/cbor-gen"
+	xerrors "golang.org/x/xerrors"
+)
+
+var _ = xerrors.Errorf
+var _ = cid.Undef
+var _ = math.E
+var _ = sort.Sort
+
+func (t *GraphFriend) MarshalCBOR(w io.Writer) error {
+	if t == nil {
+		_, err := w.Write(cbg.CborNull)
+		return err
+	}
+
+	cw := cbg.NewCborWriter(w)
+
+	if _, err := cw.Write([]byte{163}); err != nil {
+		return err
+	}
+
+	// t.LexiconTypeID (string) (string)
+	if len("$type") > 1000000 {
+		return xerrors.Errorf("Value in field \"$type\" was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("$type"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("$type")); err != nil {
+		return err
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("app.atyo.graph.friend"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("app.atyo.graph.friend")); err != nil {
+		return err
+	}
+
+	// t.Subject (string) (string)
+	if len("subject") > 1000000 {
+		return xerrors.Errorf("Value in field \"subject\" was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("subject"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("subject")); err != nil {
+		return err
+	}
+
+	if len(t.Subject) > 1000000 {
+		return xerrors.Errorf("Value in field t.Subject was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len(t.Subject))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string(t.Subject)); err != nil {
+		return err
+	}
+
+	// t.CreatedAt (string) (string)
+	if len("createdAt") > 1000000 {
+		return xerrors.Errorf("Value in field \"createdAt\" was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("createdAt"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("createdAt")); err != nil {
+		return err
+	}
+
+	if len(t.CreatedAt) > 1000000 {
+		return xerrors.Errorf("Value in field t.CreatedAt was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len(t.CreatedAt))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string(t.CreatedAt)); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (t *GraphFriend) UnmarshalCBOR(r io.Reader) (err error) {
+	*t = GraphFriend{}
+
+	cr := cbg.NewCborReader(r)
+
+	maj, extra, err := cr.ReadHeader()
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+	}()
+
+	if maj != cbg.MajMap {
+		return fmt.Errorf("cbor input should be of type map")
+	}
+
+	if extra > cbg.MaxLength {
+		return fmt.Errorf("GraphFriend: map struct too large (%d)", extra)
+	}
+
+	n := extra
+
+	nameBuf := make([]byte, 9)
+	for i := uint64(0); i < n; i++ {
+		nameLen, ok, err := cbg.ReadFullStringIntoBuf(cr, nameBuf, 1000000)
+		if err != nil {
+			return err
+		}
+
+		if !ok {
+			// Field doesn't exist on this type, so ignore it
+			if err := cbg.ScanForLinks(cr, func(cid.Cid) {}); err != nil {
+				return err
+			}
+			continue
+		}
+
+		switch string(nameBuf[:nameLen]) {
+		// t.LexiconTypeID (string) (string)
+		case "$type":
+
+			{
+				sval, err := cbg.ReadStringWithMax(cr, 1000000)
+				if err != nil {
+					return err
+				}
+
+				t.LexiconTypeID = string(sval)
+			}
+			// t.Subject (string) (string)
+		case "subject":
+
+			{
+				sval, err := cbg.ReadStringWithMax(cr, 1000000)
+				if err != nil {
+					return err
+				}
+
+				t.Subject = string(sval)
+			}
+			// t.CreatedAt (string) (string)
+		case "createdAt":
+
+			{
+				sval, err := cbg.ReadStringWithMax(cr, 1000000)
+				if err != nil {
+					return err
+				}
+
+				t.CreatedAt = string(sval)
+			}
+
+		default:
+			// Field doesn't exist on this type, so ignore it
+			if err := cbg.ScanForLinks(r, func(cid.Cid) {}); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+func (t *Ping) MarshalCBOR(w io.Writer) error {
+	if t == nil {
+		_, err := w.Write(cbg.CborNull)
+		return err
+	}
+
+	cw := cbg.NewCborWriter(w)
+	fieldCount := 6
+
+	if t.Contents == nil {
+		fieldCount--
+	}
+
+	if t.Nonce == nil {
+		fieldCount--
+	}
+
+	if t.PubKey == nil {
+		fieldCount--
+	}
+
+	if t.Targets == nil {
+		fieldCount--
+	}
+
+	if _, err := cw.Write(cbg.CborEncodeMajorType(cbg.MajMap, uint64(fieldCount))); err != nil {
+		return err
+	}
+
+	// t.LexiconTypeID (string) (string)
+	if len("$type") > 1000000 {
+		return xerrors.Errorf("Value in field \"$type\" was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("$type"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("$type")); err != nil {
+		return err
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("app.atyo.ping"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("app.atyo.ping")); err != nil {
+		return err
+	}
+
+	// t.Nonce (util.LexBytes) (slice)
+	if t.Nonce != nil {
+
+		if len("nonce") > 1000000 {
+			return xerrors.Errorf("Value in field \"nonce\" was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("nonce"))); err != nil {
+			return err
+		}
+		if _, err := cw.WriteString(string("nonce")); err != nil {
+			return err
+		}
+
+		if len(t.Nonce) > 2097152 {
+			return xerrors.Errorf("Byte array in field t.Nonce was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajByteString, uint64(len(t.Nonce))); err != nil {
+			return err
+		}
+
+		if _, err := cw.Write(t.Nonce); err != nil {
+			return err
+		}
+
+	}
+
+	// t.PubKey (util.LexBytes) (slice)
+	if t.PubKey != nil {
+
+		if len("pubKey") > 1000000 {
+			return xerrors.Errorf("Value in field \"pubKey\" was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("pubKey"))); err != nil {
+			return err
+		}
+		if _, err := cw.WriteString(string("pubKey")); err != nil {
+			return err
+		}
+
+		if len(t.PubKey) > 2097152 {
+			return xerrors.Errorf("Byte array in field t.PubKey was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajByteString, uint64(len(t.PubKey))); err != nil {
+			return err
+		}
+
+		if _, err := cw.Write(t.PubKey); err != nil {
+			return err
+		}
+
+	}
+
+	// t.Targets (util.LexBytes) (slice)
+	if t.Targets != nil {
+
+		if len("targets") > 1000000 {
+			return xerrors.Errorf("Value in field \"targets\" was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("targets"))); err != nil {
+			return err
+		}
+		if _, err := cw.WriteString(string("targets")); err != nil {
+			return err
+		}
+
+		if len(t.Targets) > 2097152 {
+			return xerrors.Errorf("Byte array in field t.Targets was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajByteString, uint64(len(t.Targets))); err != nil {
+			return err
+		}
+
+		if _, err := cw.Write(t.Targets); err != nil {
+			return err
+		}
+
+	}
+
+	// t.Contents (util.LexBytes) (slice)
+	if t.Contents != nil {
+
+		if len("contents") > 1000000 {
+			return xerrors.Errorf("Value in field \"contents\" was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("contents"))); err != nil {
+			return err
+		}
+		if _, err := cw.WriteString(string("contents")); err != nil {
+			return err
+		}
+
+		if len(t.Contents) > 2097152 {
+			return xerrors.Errorf("Byte array in field t.Contents was too long")
+		}
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajByteString, uint64(len(t.Contents))); err != nil {
+			return err
+		}
+
+		if _, err := cw.Write(t.Contents); err != nil {
+			return err
+		}
+
+	}
+
+	// t.CreatedAt (string) (string)
+	if len("createdAt") > 1000000 {
+		return xerrors.Errorf("Value in field \"createdAt\" was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len("createdAt"))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string("createdAt")); err != nil {
+		return err
+	}
+
+	if len(t.CreatedAt) > 1000000 {
+		return xerrors.Errorf("Value in field t.CreatedAt was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajTextString, uint64(len(t.CreatedAt))); err != nil {
+		return err
+	}
+	if _, err := cw.WriteString(string(t.CreatedAt)); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (t *Ping) UnmarshalCBOR(r io.Reader) (err error) {
+	*t = Ping{}
+
+	cr := cbg.NewCborReader(r)
+
+	maj, extra, err := cr.ReadHeader()
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+	}()
+
+	if maj != cbg.MajMap {
+		return fmt.Errorf("cbor input should be of type map")
+	}
+
+	if extra > cbg.MaxLength {
+		return fmt.Errorf("Ping: map struct too large (%d)", extra)
+	}
+
+	n := extra
+
+	nameBuf := make([]byte, 9)
+	for i := uint64(0); i < n; i++ {
+		nameLen, ok, err := cbg.ReadFullStringIntoBuf(cr, nameBuf, 1000000)
+		if err != nil {
+			return err
+		}
+
+		if !ok {
+			// Field doesn't exist on this type, so ignore it
+			if err := cbg.ScanForLinks(cr, func(cid.Cid) {}); err != nil {
+				return err
+			}
+			continue
+		}
+
+		switch string(nameBuf[:nameLen]) {
+		// t.LexiconTypeID (string) (string)
+		case "$type":
+
+			{
+				sval, err := cbg.ReadStringWithMax(cr, 1000000)
+				if err != nil {
+					return err
+				}
+
+				t.LexiconTypeID = string(sval)
+			}
+			// t.Nonce (util.LexBytes) (slice)
+		case "nonce":
+
+			maj, extra, err = cr.ReadHeader()
+			if err != nil {
+				return err
+			}
+
+			if extra > 2097152 {
+				return fmt.Errorf("t.Nonce: byte array too large (%d)", extra)
+			}
+			if maj != cbg.MajByteString {
+				return fmt.Errorf("expected byte array")
+			}
+
+			if extra > 0 {
+				t.Nonce = make([]uint8, extra)
+			}
+
+			if _, err := io.ReadFull(cr, t.Nonce); err != nil {
+				return err
+			}
+
+			// t.PubKey (util.LexBytes) (slice)
+		case "pubKey":
+
+			maj, extra, err = cr.ReadHeader()
+			if err != nil {
+				return err
+			}
+
+			if extra > 2097152 {
+				return fmt.Errorf("t.PubKey: byte array too large (%d)", extra)
+			}
+			if maj != cbg.MajByteString {
+				return fmt.Errorf("expected byte array")
+			}
+
+			if extra > 0 {
+				t.PubKey = make([]uint8, extra)
+			}
+
+			if _, err := io.ReadFull(cr, t.PubKey); err != nil {
+				return err
+			}
+
+			// t.Targets (util.LexBytes) (slice)
+		case "targets":
+
+			maj, extra, err = cr.ReadHeader()
+			if err != nil {
+				return err
+			}
+
+			if extra > 2097152 {
+				return fmt.Errorf("t.Targets: byte array too large (%d)", extra)
+			}
+			if maj != cbg.MajByteString {
+				return fmt.Errorf("expected byte array")
+			}
+
+			if extra > 0 {
+				t.Targets = make([]uint8, extra)
+			}
+
+			if _, err := io.ReadFull(cr, t.Targets); err != nil {
+				return err
+			}
+
+			// t.Contents (util.LexBytes) (slice)
+		case "contents":
+
+			maj, extra, err = cr.ReadHeader()
+			if err != nil {
+				return err
+			}
+
+			if extra > 2097152 {
+				return fmt.Errorf("t.Contents: byte array too large (%d)", extra)
+			}
+			if maj != cbg.MajByteString {
+				return fmt.Errorf("expected byte array")
+			}
+
+			if extra > 0 {
+				t.Contents = make([]uint8, extra)
+			}
+
+			if _, err := io.ReadFull(cr, t.Contents); err != nil {
+				return err
+			}
+
+			// t.CreatedAt (string) (string)
+		case "createdAt":
+
+			{
+				sval, err := cbg.ReadStringWithMax(cr, 1000000)
+				if err != nil {
+					return err
+				}
+
+				t.CreatedAt = string(sval)
+			}
+
+		default:
+			// Field doesn't exist on this type, so ignore it
+			if err := cbg.ScanForLinks(r, func(cid.Cid) {}); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}

api/atyo/graphfriend.go

···
+// Code generated by cmd/lexgen (see Makefile's lexgen); DO NOT EDIT.
+
+package atyo
+
+// schema: app.atyo.graph.friend
+
+import (
+	"github.com/bluesky-social/indigo/lex/util"
+)
+
+func init() {
+	util.RegisterType("app.atyo.graph.friend", &GraphFriend{})
+} //
+// RECORDTYPE: GraphFriend
+type GraphFriend struct {
+	LexiconTypeID string `json:"$type,const=app.atyo.graph.friend" cborgen:"$type,const=app.atyo.graph.friend"`
+	CreatedAt     string `json:"createdAt" cborgen:"createdAt"`
+	Subject       string `json:"subject" cborgen:"subject"`
+}

api/lexicons.json

···
+[
+  {
+    "package": "atyo",
+    "prefix": "app.atyo",
+    "outdir": "atyo",
+    "import": "atyo.app/api/atyo"
+  }
+]

appview/oauth.go

···
+package appview
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+)
+
+// https://atproto.com/specs/oauth#client-id-metadata-document
+type clientMetadata struct {
+	ClientID                    string   `json:"client_id"`
+	ClientName                  string   `json:"client_name"`
+	SubjectType                 string   `json:"subject_type"`
+	ClientURI                   string   `json:"client_uri"`
+	RedirectURIs                []string `json:"redirect_uris"`
+	GrantTypes                  []string `json:"grant_types"`
+	ResponseTypes               []string `json:"response_types"`
+	ApplicationType             string   `json:"application_type"`
+	DpopBoundAccessTokens       bool     `json:"dpop_bound_access_tokens"`
+	JwksURI                     string   `json:"jwks_uri"`
+	Scope                       string   `json:"scope"`
+	TokenEndpointAuthMethod     string   `json:"token_endpoint_auth_method"`
+	TokenEndpointAuthSigningAlg string   `json:"token_endpoint_auth_signing_alg"`
+}
+
+func newClientMetadata() clientMetadata {
+	makeRedirectURIs := func(c string) []string {
+		return []string{fmt.Sprintf("%s/oauth/callback", c)}
+	}
+
+	// TODO: configurable host
+	clientURI := fmt.Sprintf("http://127.0.0.1:3000")
+	redirectURIs := makeRedirectURIs(clientURI)
+
+	query := url.Values{}
+	query.Add("redirect_uri", redirectURIs[0])
+	query.Add("scope", "atproto transition:generic")
+	clientID := fmt.Sprintf("http://localhost?%s", query.Encode())
+
+	jwksURI := fmt.Sprintf("%s/oauth/jwks.json", clientURI)
+
+	return clientMetadata{
+		ClientID:                    clientID,
+		ClientName:                  "ATyo",
+		SubjectType:                 "public",
+		ClientURI:                   clientURI,
+		RedirectURIs:                redirectURIs,
+		GrantTypes:                  []string{"authorization_code", "refresh_token"},
+		ResponseTypes:               []string{"code"},
+		ApplicationType:             "web",
+		DpopBoundAccessTokens:       true,
+		JwksURI:                     jwksURI,
+		Scope:                       "atproto transition:generic",
+		TokenEndpointAuthMethod:     "private_key_jwt",
+		TokenEndpointAuthSigningAlg: "ES256",
+	}
+}
+
+// Serve client metadata for OAuth.
+func (*Server) handleOAuthMetadata(w http.ResponseWriter, req *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	meta := newClientMetadata()
+	json.NewEncoder(w).Encode(meta)
+}
+
+func (*Server) handleJwks(w http.ResponseWriter, req *http.Request) {
+	// TODO
+}
+
+func (*Server) handleOAuthCallback(w http.ResponseWriter, req *http.Request) {
+	// TODO
+}

appview/router.go

···
+package appview
+
+import (
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+
+	"atyo.app/api/atyo"
+	"github.com/bluesky-social/indigo/atproto/identity"
+	"github.com/bluesky-social/indigo/atproto/syntax"
+	"golang.org/x/crypto/nacl/box"
+)
+
+type Server struct {
+	directory *identity.BaseDirectory
+}
+
+func NewServer() *Server {
+	return &Server{
+		directory: &identity.BaseDirectory{},
+	}
+}
+
+func (r *Server) InitializeRoutes() *http.ServeMux {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /", r.handleStatic)
+
+	mux.HandleFunc("POST /ping", r.handlePing)
+
+	mux.HandleFunc("GET /oauth/client-metadata.json", r.handleOAuthMetadata)
+	mux.HandleFunc("GET /oauth/jwks.json", r.handleJwks)
+	mux.HandleFunc("GET /oauth/callback", r.handleOAuthCallback)
+	return mux
+}
+
+// Static assets (i.e. the client application).
+func (*Server) handleStatic(w http.ResponseWriter, req *http.Request) {
+	http.ServeFile(w, req, "public")
+}
+
+// Basic ping functionality.
+// - `target` should be a DID or handle
+func (s *Server) handlePing(w http.ResponseWriter, req *http.Request) {
+	targetStr := strings.TrimPrefix(req.PostFormValue("target"), "@")
+	fmt.Fprintln(os.Stderr, "got request for ping to `"+targetStr+"`")
+
+	target, err := syntax.ParseAtIdentifier(targetStr)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		w.Write([]byte("Invalid target identity `" + targetStr + "`"))
+		return
+	}
+
+	targetId, err := s.directory.Lookup(req.Context(), *target)
+	if err != nil {
+		w.WriteHeader(http.StatusNotFound)
+		w.Write([]byte("Target `" + targetStr + "` not found"))
+		return
+	}
+
+	fmt.Fprintln(
+		os.Stderr,
+		"resolved to `"+targetId.Handle.String()+"` ("+targetId.DID.String()+")",
+	)
+
+	const nonceLen = 24
+	var nonce [nonceLen]byte
+	if len, err := rand.Read(nonce[:]); len != nonceLen || err != nil {
+		panic("rand.Read returned unexpected result")
+	}
+
+	sharedPubKey, sharedSecretKey, err := box.GenerateKey(rand.Reader)
+	if err != nil {
+		panic("failed to generate shared keypair")
+	}
+
+	// TODO: this is where e.g. geo contents would go
+	message := padMessage(nil)
+
+	targetPubkey, err := fetchUserPubKey(targetId)
+	if err != nil {
+		w.WriteHeader(http.StatusNotFound)
+		w.Write([]byte("Target `" + targetStr + "` does not have an atyo.app identity"))
+		return
+	}
+
+	encryptedMessage, err := box.SealAnonymous(nil, message, sharedPubKey, rand.Reader)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("Failed to encrypt message payload"))
+		return
+
+	}
+
+	encSharedKey, err := box.SealAnonymous(nil, sharedSecretKey[:], &targetPubkey, rand.Reader)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("Failed to encrypt shared secret for recipient"))
+		return
+	}
+
+	ping := atyo.Ping{
+		Contents:  encryptedMessage,
+		CreatedAt: syntax.DatetimeNow().String(),
+		Nonce:     nonce[:],
+		PubKey:    sharedPubKey[:],
+		Targets:   encSharedKey,
+	}
+
+	jsonPing, err := json.MarshalIndent(&ping, "", "  ")
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("Failed to serialize ping: " + err.Error()))
+		return
+	}
+
+	fmt.Fprintln(os.Stderr, "would write ping to PDS: "+string(jsonPing))
+	// TODO write records to our PDS
+}
+
+// https://en.wikipedia.org/wiki/Padding_(cryptography)#ISO/IEC_7816-4
+// Used since that's what libsodium uses: https://doc.libsodium.org/padding
+func padMessage(msg []byte) []byte {
+	// round to next highest 1k (2^10)
+	mask := 10 - 1
+	length := (max(len(msg), 1) + mask) & ^mask
+
+	fmt.Println("len(msg)", len(msg), "length", length)
+
+	result := make([]byte, length)
+	copy(result, msg)
+	result[len(msg)] = 0x80
+
+	return result
+}
+
+// TODO: get pubkey from atproto profile; probably needs a new lexicon
+// also maybe if there are multiple records we should do one for each?
+func fetchUserPubKey(id *identity.Identity) (key [32]byte, err error) {
+	return
+}
+
+// TODO: load from local DB or something like that...
+// There should probably be expiration dates associated with these too
+func fetchPrivKey() (key [32]byte, err error) {
+	return
+}

cmd/appview/main.go

···
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+
+	"atyo.app/appview"
+)
+
+func main() {
+	server := appview.NewServer()
+	mux := server.InitializeRoutes()
+
+	// TODO configurable listen address, TLS, etc
+	listenAddr := "127.0.0.1:3000"
+	fmt.Fprintln(os.Stderr, "Starting server on http://"+listenAddr)
+	http.ListenAndServe(listenAddr, mux)
+}

gen/main.go

···
+package main
+
+import (
+	"atyo.app/api/atyo"
+	cbg "github.com/whyrusleeping/cbor-gen"
+)
+
+func main() {
+	gen := cbg.Gen{
+		MaxStringLength: 1_000_000,
+	}
+
+	if err := gen.WriteMapEncodersToFile(
+		"atyo/cbor_gen.go",
+		"atyo",
+		atyo.GraphFriend{},
+		atyo.Ping{},
+	); err != nil {
+		panic(err)
+	}
+}

go.mod

···
+module atyo.app
+
+go 1.24.0
+
+toolchain go1.24.4
+
+require (
+	github.com/bluesky-social/indigo v0.0.0-20250621010046-488d1b91889b
+	github.com/whyrusleeping/cbor-gen v0.2.1-0.20241030202151-b7a6831be65e
+	tangled.sh/icyphox.sh/atproto-oauth v0.0.0-20250526154904-3906c5336421
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/carlmjohnson/versioninfo v0.22.5 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang-jwt/jwt/v5 v5.2.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.5 // indirect
+	github.com/hashicorp/golang-lru v1.0.2 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/ipfs/bbloom v0.0.4 // indirect
+	github.com/ipfs/go-block-format v0.2.0 // indirect
+	github.com/ipfs/go-cid v0.4.1 // indirect
+	github.com/ipfs/go-datastore v0.6.0 // indirect
+	github.com/ipfs/go-ipfs-blockstore v1.3.1 // indirect
+	github.com/ipfs/go-ipfs-ds-help v1.1.1 // indirect
+	github.com/ipfs/go-ipfs-util v0.0.3 // indirect
+	github.com/ipfs/go-ipld-cbor v0.1.0 // indirect
+	github.com/ipfs/go-ipld-format v0.6.0 // indirect
+	github.com/ipfs/go-log v1.0.5 // indirect
+	github.com/ipfs/go-log/v2 v2.5.1 // indirect
+	github.com/ipfs/go-metrics-interface v0.0.1 // indirect
+	github.com/jbenet/goprocess v0.1.4 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/lestrrat-go/blackmagic v1.0.2 // indirect
+	github.com/lestrrat-go/httpcc v1.0.1 // indirect
+	github.com/lestrrat-go/httprc v1.0.4 // indirect
+	github.com/lestrrat-go/iter v1.0.2 // indirect
+	github.com/lestrrat-go/jwx/v2 v2.0.12 // indirect
+	github.com/lestrrat-go/option v1.0.1 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
+	github.com/minio/sha256-simd v1.0.1 // indirect
+	github.com/mr-tron/base58 v1.2.0 // indirect
+	github.com/multiformats/go-base32 v0.1.0 // indirect
+	github.com/multiformats/go-base36 v0.2.0 // indirect
+	github.com/multiformats/go-multibase v0.2.0 // indirect
+	github.com/multiformats/go-multihash v0.2.3 // indirect
+	github.com/multiformats/go-varint v0.0.7 // indirect
+	github.com/opentracing/opentracing-go v1.2.0 // indirect
+	github.com/polydawn/refmt v0.89.1-0.20221221234430-40501e09de1f // indirect
+	github.com/prometheus/client_golang v1.17.0 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/common v0.45.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/rivo/uniseg v0.1.0 // indirect
+	github.com/segmentio/asm v1.2.0 // indirect
+	github.com/spaolacci/murmur3 v1.1.0 // indirect
+	gitlab.com/yawning/secp256k1-voi v0.0.0-20230925100816-f2616030848b // indirect
+	gitlab.com/yawning/tuplehash v0.0.0-20230713102510-df83abbf9a02 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1 // indirect
+	go.opentelemetry.io/otel v1.29.0 // indirect
+	go.opentelemetry.io/otel/metric v1.29.0 // indirect
+	go.opentelemetry.io/otel/trace v1.29.0 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.26.0 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/time v0.8.0 // indirect
+	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+	lukechampine.com/blake3 v1.2.1 // indirect
+)

go.sum

···
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bluesky-social/indigo v0.0.0-20250621010046-488d1b91889b h1:QniihTdfvYFr8oJZgltN0VyWSWa28v/0DiIVFHy6nfg=
+github.com/bluesky-social/indigo v0.0.0-20250621010046-488d1b91889b/go.mod h1:8FlFpF5cIq3DQG0kEHqyTkPV/5MDQoaWLcVwza5ZPJU=
+github.com/carlmjohnson/versioninfo v0.22.5 h1:O00sjOLUAFxYQjlN/bzYTuZiS0y6fWDQjMRvwtKgwwc=
+github.com/carlmjohnson/versioninfo v0.22.5/go.mod h1:QT9mph3wcVfISUKd0i9sZfVrPviHuSF+cUtLjm2WSf8=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+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/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/decred/dcrd/crypto/blake256 v1.0.1/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 h1:8UrgZ3GkP4i/CLijOJx79Yu+etlyjdBU4sfcs2WYQMs=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0/go.mod h1:v57UDF4pDQJcEfFUCRop3lJL149eHGSe9Jvczhzjo/0=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/go-yaml/yaml v2.1.0+incompatible/go.mod h1:w2MrLa16VYP0jy6N7M5kHaCkaLENm+P+Tv+MfurjSw0=
+github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
+github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/hashicorp/go-cleanhttp v0.5.2 h1:035FKYIWjmULyFRBKPs8TBQoi0x6d9G4xc9neXJWAZQ=
+github.com/hashicorp/go-cleanhttp v0.5.2/go.mod h1:kO/YDlP8L1346E6Sodw+PrpBSV4/SoxCXGY6BqNFT48=
+github.com/hashicorp/go-hclog v0.9.2 h1:CG6TE5H9/JXsFWJCfoIVpKFIkFe6ysEuHirp4DxCsHI=
+github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
+github.com/hashicorp/go-retryablehttp v0.7.5 h1:bJj+Pj19UZMIweq/iie+1u5YCdGrnxCT9yvm0e+Nd5M=
+github.com/hashicorp/go-retryablehttp v0.7.5/go.mod h1:Jy/gPYAdjqffZ/yFGCFV2doI5wjtH1ewM9u8iYVjtX8=
+github.com/hashicorp/golang-lru v1.0.2 h1:dV3g9Z/unq5DpblPpw+Oqcv4dU/1omnb4Ok8iPY6p1c=
+github.com/hashicorp/golang-lru v1.0.2/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/ipfs/bbloom v0.0.4 h1:Gi+8EGJ2y5qiD5FbsbpX/TMNcJw8gSqr7eyjHa4Fhvs=
+github.com/ipfs/bbloom v0.0.4/go.mod h1:cS9YprKXpoZ9lT0n/Mw/a6/aFV6DTjTLYHeA+gyqMG0=
+github.com/ipfs/go-block-format v0.2.0 h1:ZqrkxBA2ICbDRbK8KJs/u0O3dlp6gmAuuXUJNiW1Ycs=
+github.com/ipfs/go-block-format v0.2.0/go.mod h1:+jpL11nFx5A/SPpsoBn6Bzkra/zaArfSmsknbPMYgzM=
+github.com/ipfs/go-cid v0.4.1 h1:A/T3qGvxi4kpKWWcPC/PgbvDA2bjVLO7n4UeVwnbs/s=
+github.com/ipfs/go-cid v0.4.1/go.mod h1:uQHwDeX4c6CtyrFwdqyhpNcxVewur1M7l7fNU7LKwZk=
+github.com/ipfs/go-datastore v0.6.0 h1:JKyz+Gvz1QEZw0LsX1IBn+JFCJQH4SJVFtM4uWU0Myk=
+github.com/ipfs/go-datastore v0.6.0/go.mod h1:rt5M3nNbSO/8q1t4LNkLyUwRs8HupMeN/8O4Vn9YAT8=
+github.com/ipfs/go-detect-race v0.0.1 h1:qX/xay2W3E4Q1U7d9lNs1sU9nvguX0a7319XbyQ6cOk=
+github.com/ipfs/go-detect-race v0.0.1/go.mod h1:8BNT7shDZPo99Q74BpGMK+4D8Mn4j46UU0LZ723meps=
+github.com/ipfs/go-ipfs-blockstore v1.3.1 h1:cEI9ci7V0sRNivqaOr0elDsamxXFxJMMMy7PTTDQNsQ=
+github.com/ipfs/go-ipfs-blockstore v1.3.1/go.mod h1:KgtZyc9fq+P2xJUiCAzbRdhhqJHvsw8u2Dlqy2MyRTE=
+github.com/ipfs/go-ipfs-ds-help v1.1.1 h1:B5UJOH52IbcfS56+Ul+sv8jnIV10lbjLF5eOO0C66Nw=
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lexicons/friend.json

···
+{
+  "lexicon": 1,
+  "id": "app.atyo.graph.friend",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "Record declaring that a given identity is allowed to ping this user. The appview should only track ping records for friended users.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["subject", "createdAt"],
+        "properties": {
+          "subject": { "type": "string", "format": "did" },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}

lexicons/ping.json

···
+{
+  "lexicon": 1,
+  "id": "app.atyo.ping",
+  "defs": {
+    "main": {
+      "type": "record",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["contents", "createdAt", "hash"],
+        "properties": {
+          "targets": {
+            "type": "bytes",
+            "description": "The one-time private key to decrypt `contents`, which has been encrypted for each recipient."
+          },
+          "contents": {
+            "type": "bytes",
+            "description": "A message encrypted for a specific recipient, possibly including an encrypted payload. After decryption, this will deserialize from CBOR / JSON as `app.atyo.ping#contents`."
+          },
+          "createdAt": {
+            "type": "string",
+            "format": "datetime",
+            "description": "The time of record creation."
+          },
+          "nonce": {
+            "type": "bytes",
+            "description": "Random number used to encrypt the message contents"
+          },
+          "pubKey": {
+            "type": "bytes",
+            "description": "One-time key used to encrypt the message contents"
+          }
+        }
+      }
+    },
+    "contents": {
+      "type": "union",
+      "description": "A message intended for another user.",
+      "refs": [
+        "#empty"
+      ]
+    },
+    "empty": {
+      "type": "object",
+      "description": "An empty ping",
+      "properties": {}
+    },
+    "location": {
+      "type": "object",
+      "description": "TODO: a ping marked with a location, i.e. @yo",
+      "properties": {}
+    }
+  }
+}

public/index.html

···
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>ATyo</title>
+    <script type="text/javascript">
+      
+    </script>
+  </head>
+  <body>
+      <h1>ATYo</h1>
+      <div>
+        <form action="/ping" method="POST">
+          <label for="target">Send yo to handle:</label><br>
+          <input type="text" id="target" name="target" placeholder="@alice.example.com"><br>
+          <input type="submit" value="Submit"">
+        </form> 
+      </div>
+  </body>
+</html>