start mDNS

TODO

@@ -5,5 +5,3 @@ feat: improve flags
 feat: replace uuid dep with custom id generator
 feat: multiple files
 fix: remove `_` prefix
-fix: kill server after `n` downloads
-feat: use zeroconf for mDNS

cmd/lash/main.go

@@ -8,12 +8,16 @@ import (
 	"lash/internal/app"
 	"lash/internal/errx"
 	share "lash/internal/shareLink"
+	"net"
 	"net/http"
+
+	"github.com/hashicorp/mdns"
 )
 
 var versionFlag = flag.Bool("version", false, "Print out version and exit.")
 
 var port = flag.Int("p", 1337, "Set the port for LASH exchanges.")
+var numberOfShares = flag.Int("n", -1, "Number of shares to allow before killing the server.")
 
 func main() {
 	flag.Parse()
@@ -23,14 +27,34 @@ func main() {
 		return
 	}
 
-	srv := app.New()
+	ctx := lash.LashContext{
+		N: *numberOfShares,
+	}
+
+	srv := app.New(&ctx)
+
+	server := http.Server{
+		Addr:    fmt.Sprintf(":%d", *port),
+		Handler: srv,
+	}
+
+	info := []string{"lash"}
+	service, err := mdns.NewMDNSService("lash", "__foobar.__tcp", "", "", *port, []net.IP{net.ParseIP(share.GetLocalIP())}, info)
+	if err != nil {
+		errx.FatalPerror(err)
+	}
+
+	mdns_server, err := mdns.NewServer(&mdns.Config{Zone: service})
+	defer mdns_server.Shutdown()
+	if err != nil {
+		errx.FatalPerror(err)
+	}
 
 	// TODO(vxc): Make this more portable
 	errx.Log("Your share link is %s", share.GenerateShareLink(*port))
 	errx.Log("Your token is \033[1;92m%s\033[0m", lash.Token)
-
 	errx.Log("starting server at http://0.0.0.0:%d", *port)
-	if err := http.ListenAndServe(fmt.Sprintf(":%d", *port), srv); err != nil {
+	if err := server.ListenAndServe(); err != nil {
 		errx.FatalPerror(err)
 	}
 }

go.mod

@@ -2,4 +2,13 @@ module lash
 
 go 1.26.3
 
-require github.com/google/uuid v1.6.0 // indirect
+require (
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/mdns v1.0.6 // indirect
+	github.com/miekg/dns v1.1.55 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.34.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
+)

go.sum

@@ -1,2 +1,82 @@
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 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/hashicorp/mdns v1.0.6 h1:SV8UcjnQ/+C7KeJ/QeVD/mdN2EmzYfcGfufcuzxfCLQ=
+github.com/hashicorp/mdns v1.0.6/go.mod h1:X4+yWh+upFECLOki1doUPaKpgNQII9gy4bUdCYKNhmM=
+github.com/miekg/dns v1.1.55 h1:GoQ4hpsj0nFLYe+bWiCToyrBEJXkQfOOIvFGFy0lEgo=
+github.com/miekg/dns v1.1.55/go.mod h1:uInx36IzPl7FYnDcMeVWxj9byh7DutNykX4G9Sj60FY=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
+golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.7.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.15.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.17.0 h1:zY54UmvipHiNd+pm+m0x9KhZ9hl1/7QNMyxXbc6ICqA=
+golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
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+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/telemetry v0.0.0-20240228155512-f48c80bd79b2/go.mod h1:TeRTkGYfJXctD9OcfyVLyj2J3IxLnKwHJR8f4D8a3YE=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
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+golang.org/x/term v0.28.0/go.mod h1:Sw/lC2IAUZ92udQNf3WodGtn4k/XoLyZoh8v/8uiwek=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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+golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
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+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.3.0/go.mod h1:/rWhSS2+zyEVwoJf8YAX6L2f0ntZ7Kn/mGgAWcipA5k=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d h1:vU5i/LfpvrRCpgM/VPfJLg5KjxD3E+hfT1SH+d9zLwg=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

internal/app/routes.go

@@ -8,7 +8,7 @@ import (
 	"os"
 )
 
-func New() http.Handler {
+func New(ctx *lash.LashContext) http.Handler {
 	mux := http.NewServeMux()
 
 	fp, err := GetFilePath()
@@ -25,9 +25,12 @@ func New() http.Handler {
 		Version: lash.Version,
 	}
 
-	file := handlers.FileData{
+	file := handlers.FileHandler{
+		Ctx: ctx,
+		FileData: handlers.FileData{
 			Contents: contents,
 			FileName: fp,
+		},
 	}
 
 	mux.HandleFunc("/", share.Handler)

internal/handlers/file.go

@@ -5,9 +5,15 @@ import (
 	"fmt"
 	"lash"
 	"net/http"
+	"os"
 	"strconv"
 )
 
+type FileHandler struct {
+	Ctx      *lash.LashContext
+	FileData FileData
+}
+
 type FileData struct {
 	Contents []byte
 	FileName string
@@ -17,7 +23,14 @@ type ValidateRequest struct {
 	Token string
 }
 
-func (h FileData) APIHandler(w http.ResponseWriter, r *http.Request) {
+var sent int = 0
+
+func (h FileHandler) APIHandler(w http.ResponseWriter, r *http.Request) {
+	if sent >= h.Ctx.N && h.Ctx.N != -1 {
+		w.WriteHeader(http.StatusTooManyRequests)
+		os.Exit(0)
+		return
+	}
 	decoder := json.NewDecoder(r.Body)
 
 	var t ValidateRequest
@@ -32,21 +45,27 @@ func (h FileData) APIHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Send the file over as a stream of bytes
+	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s", h.FileData.FileName))
-	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s", h.FileName))
 	w.Header().Set("Content-Type", "application/octet-stream")
-	w.Header().Set("Content-Length", strconv.Itoa(len(h.Contents)))
+	w.Header().Set("Content-Length", strconv.Itoa(len(h.FileData.Contents)))
 
 	w.WriteHeader(http.StatusOK)
-	w.Write(h.Contents)
+	w.Write(h.FileData.Contents)
+	sent++
 }
 
-func (h FileData) FileHandler(w http.ResponseWriter, r *http.Request) {
+func (h FileHandler) FileHandler(w http.ResponseWriter, r *http.Request) {
-	// Send the file over as a stream of bytes
+	if sent >= h.Ctx.N && h.Ctx.N != -1 {
-	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s", h.FileName))
+		w.WriteHeader(http.StatusTooManyRequests)
+		os.Exit(0)
+		return
+	}
+
+	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s", h.FileData.FileName))
 	w.Header().Set("Content-Type", "application/octet-stream")
-	w.Header().Set("Content-Length", strconv.Itoa(len(h.Contents)))
+	w.Header().Set("Content-Length", strconv.Itoa(len(h.FileData.Contents)))
 
 	w.WriteHeader(http.StatusOK)
-	w.Write(h.Contents)
+	w.Write(h.FileData.Contents)
+	sent++
 }

internal/shareLink/shareLink.go

@@ -9,14 +9,14 @@ import (
 
 func GenerateShareLink(port int) string {
 	link := "http://"
-	link += getLocalIP()
+	link += GetLocalIP()
 	link += fmt.Sprintf(":%d", port)
 	link += "/"
 	link += lash.ShareLinkToken
 	return link
 }
 
-func getLocalIP() string {
+func GetLocalIP() string {
 	conn, err := net.Dial("udp", "8.8.8.8:80")
 	if err != nil {
 		errx.FatalPerror(err)

lash.go

@@ -2,10 +2,16 @@ package lash
 
 import (
 	"embed"
+	"net/http"
 
 	"github.com/google/uuid"
 )
 
+type LashContext struct {
+	N      int
+	Server *http.Server
+}
+
 //go:embed templates/*.html
 var Templates embed.FS
 

version

@@ -1 +1 @@
-1.0.0
+3