Initial commit

3 files changed, 462 insertions, 0 deletions

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..546f5ef
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module git.deuxfleurs.fr/Deuxfleurs/bagage
+
+go 1.16
+
+require (
+	github.com/go-ldap/ldap/v3 v3.4.1
+	github.com/minio/minio-go/v7 v7.0.12
+	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..57620ee
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,88 @@
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+github.com/Azure/go-ntlmssp v0.0.0-20200615164410-66371956d46c/go.mod h1:chxPXzSsl7ZWRAuOIE23GDNzjWuZquvFlgA8xmpunjU=
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..89fc88a
--- /dev/null
+++ b/main.go
@@ -0,0 +1,365 @@
+package main
+
+import (
+  "context"
+	"log"
+  "fmt"
+  "os"
+  "io/fs"
+  "time"
+  "errors"
+	"net/http"
+  "strings"
+  "path"
+
+	"golang.org/x/net/webdav"
+
+  "github.com/go-ldap/ldap/v3"
+
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+)
+
+type bagageCtxKey string
+const garageEntry = bagageCtxKey("garage")
+
+type garageCtx struct {
+	MC *minio.Client
+  StatCache map[string]*GarageStat
+}
+
+func main() {
+  pathPrefix := "/webdav"
+  UserBaseDN := "ou=users,dc=deuxfleurs,dc=fr"
+  UserNameAttr := "cn"
+  Endpoint := "garage.deuxfleurs.fr"
+  UseSSL := true
+
+	srv := &webdav.Handler{
+    Prefix: pathPrefix,
+		FileSystem: NewGarageFS(),
+		LockSystem: webdav.NewMemLS(),
+		Logger: func(r *http.Request, err error) {
+			log.Printf("WEBDAV: %#s, ERROR: %v", r, err)
+		},
+	}
+
+	//http.Handle("/", srv)
+  http.HandleFunc(pathPrefix + "/", func(w http.ResponseWriter, r *http.Request) {
+    username, password, ok := r.BasicAuth()
+
+    if !ok {
+      NotAuthorized(w,r)
+      return
+    }
+
+    ldapSock, err := ldap.Dial("tcp", "127.0.0.1:1389")
+    if err != nil {
+	    log.Println(err)
+      InternalError(w,r)
+      return
+    }
+    defer ldapSock.Close()
+
+    // Check credential
+    userDn := fmt.Sprintf("%s=%s,%s", UserNameAttr, username, UserBaseDN)
+    err = ldapSock.Bind(userDn, password)
+    if err != nil {
+      log.Println(err)
+      NotAuthorized(w,r)
+      return
+    }
+
+    // Get S3 creds garage_s3_access_key garage_s3_secret_key
+    searchRequest := ldap.NewSearchRequest(
+      userDn,
+      ldap.ScopeBaseObject,
+      ldap.NeverDerefAliases,
+      0,
+      0,
+      false,
+      "(objectClass=*)",
+      []string{"garage_s3_access_key", "garage_s3_secret_key"},
+      nil)
+
+    sr, err := ldapSock.Search(searchRequest)
+    if err != nil {
+	    log.Println(err)
+      InternalError(w,r)
+      return
+    }
+
+    if len(sr.Entries) != 1 {
+      log.Println("Wrong number of LDAP entries, expected 1, got", len(sr.Entries))
+      InternalError(w,r)
+      return
+    }
+
+    access_key := sr.Entries[0].GetAttributeValue("garage_s3_access_key")
+    secret_key := sr.Entries[0].GetAttributeValue("garage_s3_secret_key")
+
+    if access_key == "" || secret_key == "" {
+      log.Println("Either access key or secret key is missing in LDAP for ", userDn)
+      InternalError(w,r)
+      return
+    }
+
+	  mc, err := minio.New(Endpoint, &minio.Options{
+		  Creds:  credentials.NewStaticV4(access_key, secret_key, ""),
+		  Secure: UseSSL,
+    })
+	  if err != nil {
+      log.Println(err)
+      InternalError(w,r)
+      return
+	  }
+
+    nctx := context.WithValue(r.Context(), garageEntry, garageCtx{MC: mc, StatCache: make(map[string]*GarageStat)})
+    srv.ServeHTTP(w, r.WithContext(nctx))
+    return
+  })
+
+	if err := http.ListenAndServe(":8080", nil); err != nil {
+		log.Fatalf("Error with WebDAV server: %v", err)
+	}
+}
+
+func NotAuthorized(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("WWW-Authenticate", `Basic realm="Pour accéder à Bagage, veuillez entrer vos identifiants Deuxfleurs"`)
+	w.WriteHeader(401)
+	w.Write([]byte("401 Unauthorized\n"))
+}
+
+func InternalError(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(500)
+  w.Write([]byte("500 Internal Server Error\n"))
+}
+
+/*
+  /////// Select Action
+  If no slash or one trailing slash
+    return ListBuckets
+  Else
+    obj := ListObjects
+    If obj.Length == 1
+      return GetObject
+    Else
+      return obj
+*/
+type GarageFS struct {}
+
+func NewGarageFS() *GarageFS {
+	grg := new(GarageFS)
+	return grg
+}
+
+func (s *GarageFS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
+  return errors.New("Not implemented Mkdir")
+}
+
+func (s *GarageFS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
+  return NewGarageFile(ctx, name)
+}
+
+func (s *GarageFS) RemoveAll(ctx context.Context, name string) error {
+  return errors.New("Not implemented RemoveAll")
+}
+
+func (s *GarageFS) Rename(ctx context.Context, oldName, newName string) error {
+  return errors.New("Not implemented Rename")
+}
+
+func (s *GarageFS) Stat(ctx context.Context, name string) (os.FileInfo, error) {
+  return NewGarageStat(ctx, name)
+}
+
+type GarageFile struct {
+  ctx context.Context
+  mc *minio.Client
+  path string
+}
+
+func NewGarageFile(ctx context.Context, path string) (webdav.File, error) {
+  gf := new(GarageFile)
+  gf.ctx = ctx
+  gf.mc = ctx.Value(garageEntry).(garageCtx).MC
+  gf.path = path
+  return gf, nil
+}
+
+func (gf *GarageFile) Close() error {
+  return errors.New("not implemented Close")
+}
+
+func (gf *GarageFile) Read(p []byte) (n int, err error) {
+  return 0, errors.New("not implemented Read")
+}
+
+func (gf *GarageFile)	Write(p []byte) (n int, err error) {
+  return 0, errors.New("not implemented Write")
+}
+
+func (gf *GarageFile) Seek(offset int64, whence int) (int64, error) {
+  return 0, errors.New("not implemented Seek")
+}
+
+/*
+ReadDir reads the contents of the directory associated with the file f and returns a slice of DirEntry values in directory order. Subsequent calls on the same file will yield later DirEntry records in the directory.
+
+If n > 0, ReadDir returns at most n DirEntry records. In this case, if ReadDir returns an empty slice, it will return an error explaining why. At the end of a directory, the error is io.EOF.
+
+If n <= 0, ReadDir returns all the DirEntry records remaining in the directory. When it succeeds, it returns a nil error (not io.EOF).
+*/
+func (gf *GarageFile) Readdir(count int) ([]fs.FileInfo, error) {
+  log.Println("Call Readdir with count", count)
+
+  if gf.path == "/" {
+    return gf.readDirRoot(count)
+  } else {
+    exploded_path := strings.SplitN(gf.path, "/", 3)
+    return gf.readDirChild(count, exploded_path[1], exploded_path[2])
+  }
+}
+
+func (gf *GarageFile) readDirRoot(count int) ([]fs.FileInfo, error) {
+  buckets, err := gf.mc.ListBuckets(gf.ctx)
+  if err != nil {
+    return nil, err
+  }
+
+  entries := make([]fs.FileInfo, 0, len(buckets))
+  for _, bucket := range buckets {
+    ngf, err := NewGarageStat(gf.ctx, "/"+bucket.Name)
+    if err != nil {
+      return nil, err
+    }
+    entries = append(entries, ngf)
+  }
+
+  return entries, nil
+}
+
+func (gf *GarageFile) readDirChild(count int, bucket, prefix string) ([]fs.FileInfo, error) {
+  log.Println("call ListObjects with", bucket, prefix)
+  objs_info := gf.mc.ListObjects(gf.ctx, bucket, minio.ListObjectsOptions{
+    Prefix: prefix,
+    Recursive: false,
+  })
+
+  entries := make([]fs.FileInfo,0)
+  for object := range objs_info {
+    if object.Err != nil {
+        return nil, object.Err
+    }
+    ngf, err := NewGarageStatFromObjectInfo(gf.ctx, bucket, object)
+    if err != nil {
+      return nil, err
+    }
+    entries = append(entries, ngf)
+  }
+
+  return entries, nil
+}
+
+func (gf *GarageFile) Stat() (fs.FileInfo, error) {
+  return NewGarageStat(gf.ctx, gf.path)
+}
+
+/* Implements */
+// StatObject???
+type GarageStat struct {
+  obj minio.ObjectInfo
+  bucket string
+}
+
+func NewGarageStat(ctx context.Context, path string) (*GarageStat, error) {
+  cache := ctx.Value(garageEntry).(garageCtx).StatCache
+  if entry, ok := cache[path]; ok {
+    return entry, nil
+  }
+
+  gs, err := newGarageStatFresh(ctx, path)
+  if err != nil {
+    return nil, err
+  }
+
+  cache[path] = gs
+  return gs, nil
+}
+
+func newGarageStatFresh(ctx context.Context, path string) (*GarageStat, error) {
+  mc := ctx.Value(garageEntry).(garageCtx).MC
+  gs := new(GarageStat)
+  gs.bucket = "/"
+  gs.obj = minio.ObjectInfo{}
+
+  exploded_path := strings.SplitN(path, "/", 3)
+
+  // Check if we can extract the bucket name
+  if len(exploded_path) < 2 {
+    return gs, nil
+  }
+  gs.bucket = exploded_path[1]
+
+  // Check if we can extract the prefix
+  if len(exploded_path) < 3 || exploded_path[2] == "" {
+    return gs, nil
+  }
+  gs.obj.Key = exploded_path[2]
+
+  // Check if this is a file or a folder
+  log.Println("call StatObject with", gs.bucket, gs.obj.Key)
+  obj, err := mc.StatObject(ctx, gs.bucket, gs.obj.Key, minio.StatObjectOptions{})
+  if e, ok := err.(minio.ErrorResponse); ok && e.Code == "NoSuchKey" {
+    return gs, nil
+  }
+  if err != nil {
+    return nil, err
+  }
+
+  // If it is a file, assign its data
+  gs.obj = obj
+  return gs, nil
+}
+
+func NewGarageStatFromObjectInfo(ctx context.Context, bucket string, obj minio.ObjectInfo) (*GarageStat, error) {
+  gs := new(GarageStat)
+  gs.bucket = bucket
+  gs.obj = obj
+
+  cache := ctx.Value(garageEntry).(garageCtx).StatCache
+  cache[path.Join("/", bucket, obj.Key)] = gs
+  return gs, nil
+}
+
+func (gs *GarageStat) Name() string {
+  if gs.obj.Key != "" {
+    return path.Base(gs.obj.Key)
+  } else {
+    return gs.bucket
+  }
+}
+
+func (gs *GarageStat) Size() int64 {
+  return gs.obj.Size
+}
+
+func (gs *GarageStat) Mode() fs.FileMode {
+  if gs.obj.ETag == "" {
+    return fs.ModeDir | fs.ModePerm
+  } else {
+    return fs.ModePerm
+  }
+}
+
+func (gs *GarageStat) ModTime() time.Time {
+  return gs.obj.LastModified
+}
+
+func (gs *GarageStat) IsDir() bool {
+  return gs.Mode().IsDir()
+}
+
+func (gs *GarageStat) Sys() interface{} {
+  return nil
+}