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Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
Knut Ahlers 2023-06-14 14:14:56 +02:00
commit abe29c2290
Signed by: luzifer
GPG key ID: D91C3E91E4CAD6F5
7 changed files with 482 additions and 0 deletions
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hold-this

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README.md Normal file
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# Luzifer / hold-this
Does what the name says: Exposes a directory through HTTP and allows putting, getting and deleting files.

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module git.luzifer.io/luzifer/hold-this
go 1.20
require (
github.com/Luzifer/go_helpers/v2 v2.18.0
github.com/Luzifer/rconfig/v2 v2.4.0
github.com/gofrs/uuid v4.4.0+incompatible
github.com/gorilla/mux v1.8.0
github.com/pkg/errors v0.9.1
github.com/sirupsen/logrus v1.9.3
)
require (
github.com/kr/pretty v0.3.1 // indirect
github.com/spf13/pflag v1.0.5 // indirect
golang.org/x/sys v0.6.0 // indirect
gopkg.in/validator.v2 v2.0.0-20210331031555-b37d688a7fb0 // indirect
gopkg.in/yaml.v2 v2.4.0 // indirect
)

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go.sum Normal file
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github.com/Luzifer/go_helpers/v2 v2.18.0 h1:zDLNPKAxyFLMcwCN2Z/0SVpU3hTTqdYWXnCyviI8IBM=
github.com/Luzifer/go_helpers/v2 v2.18.0/go.mod h1:C5EkTBawA4sJt0CHoAoblgGPwTjW9blXZ/Et6RiEu6Q=
github.com/Luzifer/rconfig/v2 v2.4.0 h1:MAdymTlExAZ8mx5VG8xOFAtFQSpWBipKYQHPOmYTn9o=
github.com/Luzifer/rconfig/v2 v2.4.0/go.mod h1:hWF3ZVSusbYlg5bEvCwalEyUSY+0JPJWUiIu7rBmav8=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
github.com/gofrs/uuid v4.4.0+incompatible h1:3qXRTX8/NbyulANqlc0lchS1gqAVxRgsuW1YrTJupqA=
github.com/gofrs/uuid v4.4.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/nxadm/tail v1.4.6 h1:11TGpSHY7Esh/i/qnq02Jo5oVrI1Gue8Slbq0ujPZFQ=
github.com/onsi/ginkgo v1.15.0 h1:1V1NfVQR87RtWAgp1lv9JZJ5Jap+XFGKPi00andXGi4=
github.com/onsi/gomega v1.10.5 h1:7n6FEkpFmfCoo2t+YYqXH0evK+a9ICQz0xcAy9dYcaQ=
github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
golang.org/x/net v0.0.0-20210119194325-5f4716e94777 h1:003p0dJM77cxMSyCPFphvZf/Y5/NXf5fzg6ufd1/Oew=
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
gopkg.in/validator.v2 v2.0.0-20210331031555-b37d688a7fb0 h1:EFLtLCwd8tGN+r/ePz3cvRtdsfYNhDEdt/vp6qsT+0A=
gopkg.in/validator.v2 v2.0.0-20210331031555-b37d688a7fb0/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=

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package main
import (
"fmt"
"io"
"io/fs"
"net/http"
"os"
"path"
"path/filepath"
"strings"
"github.com/gofrs/uuid"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const dirCreateMode = 0o750
func deriveFile(r *http.Request) (string, error) {
absRoot, err := filepath.Abs(cfg.RootDir)
if err != nil {
return "", errors.Wrap(err, "getting absolute root")
}
file := filepath.Clean(path.Join(absRoot, strings.TrimLeft(r.URL.Path, "/")))
if !strings.HasPrefix(file, path.Join(absRoot, "")) {
return "", errors.New("break-out attempt")
}
return file, nil
}
func genericHTTPError(w http.ResponseWriter, reqID string, err error, desc string) {
logrus.WithField("req_id", reqID).WithError(err).Error(desc)
http.Error(w, fmt.Sprintf("something went wrong: %s", reqID), http.StatusInternalServerError)
}
func handleDelete(w http.ResponseWriter, r *http.Request) {
reqID := uuid.Must(uuid.NewV4()).String()
f, err := deriveFile(r)
if err != nil {
genericHTTPError(w, reqID, err, "deriving file for request")
return
}
stat, err := os.Stat(f)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
w.WriteHeader(http.StatusNoContent)
return
}
genericHTTPError(w, reqID, err, "stating file")
return
}
if stat.IsDir() {
genericHTTPError(w, reqID, errors.New("is directory"), "refusing to delete dir")
return
}
if err = os.Remove(f); err != nil {
genericHTTPError(w, reqID, err, "deleting file")
return
}
w.WriteHeader(http.StatusNoContent)
}
func handleGet(w http.ResponseWriter, r *http.Request) {
reqID := uuid.Must(uuid.NewV4()).String()
f, err := deriveFile(r)
if err != nil {
genericHTTPError(w, reqID, err, "deriving file for request")
return
}
stat, err := os.Stat(f)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
http.Error(w, "not found", http.StatusNotFound)
return
}
genericHTTPError(w, reqID, err, "stating file")
return
}
if stat.IsDir() {
genericHTTPError(w, reqID, errors.New("is directory"), "refusing to get dir")
return
}
http.ServeFile(w, r, f)
}
func handlePut(w http.ResponseWriter, r *http.Request) {
reqID := uuid.Must(uuid.NewV4()).String()
f, err := deriveFile(r)
if err != nil {
genericHTTPError(w, reqID, err, "deriving file for request")
return
}
if err = os.MkdirAll(path.Dir(f), dirCreateMode); err != nil {
genericHTTPError(w, reqID, err, "ensuring directory for file")
return
}
out, err := os.Create(f)
if err != nil {
genericHTTPError(w, reqID, err, "creating file")
return
}
defer out.Close()
if _, err = io.Copy(out, r.Body); err != nil {
genericHTTPError(w, reqID, err, "copying file contents")
return
}
w.WriteHeader(http.StatusCreated)
}

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package main
import (
"net/http"
"os"
"time"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
httpHelper "github.com/Luzifer/go_helpers/v2/http"
"github.com/Luzifer/rconfig/v2"
)
var (
cfg = struct {
Listen string `flag:"listen" default:":3000" description:"Port/IP to listen on"`
LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
RootDir string `flag:"root-dir,r" default:"" vardefault:"rootDir" description:"Where to store files / get files from"`
VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
}{}
version = "dev"
)
func initApp() error {
rconfig.SetVariableDefaults(map[string]string{
"rootDir": mustMkdirTemp(),
})
rconfig.AutoEnv(true)
if err := rconfig.ParseAndValidate(&cfg); err != nil {
return errors.Wrap(err, "parsing cli options")
}
l, err := logrus.ParseLevel(cfg.LogLevel)
if err != nil {
return errors.Wrap(err, "parsing log-level")
}
logrus.SetLevel(l)
return nil
}
func main() {
var err error
if err = initApp(); err != nil {
logrus.WithError(err).Fatal("initializing app")
}
if cfg.VersionAndExit {
logrus.WithField("version", version).Info("hold-this")
os.Exit(0)
}
router := mux.NewRouter()
router.PathPrefix("/").Methods(http.MethodDelete).HandlerFunc(handleDelete)
router.PathPrefix("/").Methods(http.MethodGet).HandlerFunc(handleGet)
router.PathPrefix("/").Methods(http.MethodPost, http.MethodPut).HandlerFunc(handlePut)
var hdl http.Handler = router
hdl = httpHelper.GzipHandler(hdl)
hdl = httpHelper.NewHTTPLogHandlerWithLogger(hdl, logrus.StandardLogger())
server := &http.Server{
Addr: cfg.Listen,
Handler: hdl,
ReadHeaderTimeout: time.Second,
}
logrus.WithField("version", version).WithField("root_dir", cfg.RootDir).Info("hold-this started")
if err = server.ListenAndServe(); err != nil {
logrus.WithError(err).Fatal("listening for HTTP traffic")
}
}
func mustMkdirTemp() string {
td, err := os.MkdirTemp("", "")
if err != nil {
panic(err)
}
return td
}