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storage.go
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storage.go
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package storage
import (
"encoding/json"
"errors"
"fmt"
"html"
"io"
"net/http"
"os"
"path"
"path/filepath"
"regexp"
"time"
"github.com/filefilego/filefilego/common"
"github.com/filefilego/filefilego/common/hexutil"
"github.com/filefilego/filefilego/crypto"
"github.com/filefilego/filefilego/database"
log "github.com/sirupsen/logrus"
)
const (
// AdminAccess represents full access.
AdminAccess = "admin"
// UserAccess represents priviledge access.
UserAccess = "user"
tokenAccessHours = 2160
tokenPrefix = "token"
fileHashPrefix = "mdt"
fileHashToNodePrefix = "fhn"
)
// Interface defines the functionalities of the storage engine.
type Interface interface {
StoragePath() string
Enabled() bool
SetEnabled(val bool)
CreateSubfolders() (string, error)
SaveToken(token AccessToken) error
SaveFileMetadata(nodeHash, fileHash string, metadata FileMetadata) error
GetFileMetadata(fileHash string) (FileMetadata, error)
GetNodeHashFromFileHash(fileHash string) (string, bool)
CanAccess(token string) (bool, AccessToken, error)
}
// FileMetadata holds the metadata for a file.
type FileMetadata struct {
FileName string `json:"file_name"`
MerkleRootHash string `json:"merkle_root_hash"`
Hash string `json:"hash"`
FilePath string `json:"file_path"`
Size int64 `json:"size"`
}
// AccessToken represents an access token.
type AccessToken struct {
AccessType string `json:"access_type"`
Token string `json:"token"`
ExpiresAt int64 `json:"expires_at"`
}
// Storage represents the storage engine and the metadata.
type Storage struct {
db database.Database
storagePath string
enabled bool
merkleTreeTotalSegments int
}
// New creates a new storage instance.
func New(db database.Database, storagePath string, enabled bool, adminToken string, merkleTreeTotalSegments int) (*Storage, error) {
if db == nil {
return nil, errors.New("db is nil")
}
if storagePath == "" {
return nil, errors.New("storagePath is empty")
}
if adminToken == "" {
return nil, errors.New("adminToken is empty")
}
if merkleTreeTotalSegments == 0 {
return nil, errors.New("merkle tree total segments is zero")
}
if !common.DirExists(storagePath) {
if err := common.CreateDirectory(storagePath); err != nil {
return nil, fmt.Errorf("failed to create storage directory: %w", err)
}
}
storage := &Storage{
db: db,
storagePath: storagePath,
enabled: enabled,
merkleTreeTotalSegments: merkleTreeTotalSegments,
}
token := AccessToken{
AccessType: AdminAccess,
Token: adminToken,
ExpiresAt: time.Now().Add(time.Hour * tokenAccessHours).Unix(),
}
if err := storage.SaveToken(token); err != nil {
return nil, fmt.Errorf("failed to save admin token: %w", err)
}
return storage, nil
}
// StoragePath return the storage path.
func (s *Storage) StoragePath() string {
return s.storagePath
}
// Enabled return if storage functionality is enabled.
func (s *Storage) Enabled() bool {
return s.enabled
}
// SetEnabled return if storage functionality is enabled.
func (s *Storage) SetEnabled(val bool) {
s.enabled = val
}
// CreateSubfolders creates sub folders with current date inside the data directory.
func (s *Storage) CreateSubfolders() (string, error) {
currentTime := time.Now()
folder := fmt.Sprintf("%d-%02d-%02d", currentTime.Year(), currentTime.Month(), currentTime.Day())
destinationPath := path.Join(s.storagePath, folder)
if err := common.CreateDirectory(destinationPath); err != nil {
return "", err
}
return destinationPath, nil
}
// SaveToken saves an access token into the database.
func (s *Storage) SaveToken(token AccessToken) error {
if token.Token == "" || token.AccessType == "" || token.ExpiresAt == 0 {
return errors.New("invalid access token")
}
data, err := json.Marshal(&token)
if err != nil {
return fmt.Errorf("failed to marshal access token: %w", err)
}
return s.db.Put(append([]byte(tokenPrefix), []byte(token.Token)...), data)
}
// SaveFileMetadata saves a file's metadata in the database.
func (s *Storage) SaveFileMetadata(nodeHash, fileHash string, metadata FileMetadata) error {
if metadata.MerkleRootHash == "" || metadata.FilePath == "" || metadata.Hash == "" || metadata.Size == 0 {
return errors.New("invalid file metadata")
}
data, err := json.Marshal(&metadata)
if err != nil {
return fmt.Errorf("failed to marshal file metadata: %w", err)
}
err = s.db.Put(append([]byte(fileHashPrefix), []byte(fileHash)...), data)
if err != nil {
return fmt.Errorf("failed to insert nodeHash %s", fileHash)
}
if nodeHash != "" {
err = s.db.Put(append([]byte(fileHashToNodePrefix), []byte(metadata.Hash)...), []byte(nodeHash))
if err != nil {
return fmt.Errorf("failed to insert fileHash %s", metadata.Hash)
}
}
return nil
}
// GetFileMetadata gets a file's metadata in the database.
func (s *Storage) GetFileMetadata(fileHash string) (FileMetadata, error) {
if fileHash == "" {
return FileMetadata{}, errors.New("file hash is empty")
}
data, err := s.db.Get(append([]byte(fileHashPrefix), []byte(fileHash)...))
if err != nil {
return FileMetadata{}, fmt.Errorf("failed to get file metadata: %w", err)
}
metadata := FileMetadata{}
err = json.Unmarshal(data, &metadata)
if err != nil {
return FileMetadata{}, fmt.Errorf("failed to unmarshal file metadata: %w", err)
}
return metadata, nil
}
// GetNodeHashFromFileHash gets the node's Hash given a fileHash.
func (s *Storage) GetNodeHashFromFileHash(fileHash string) (string, bool) {
if fileHash == "" {
return "", false
}
nodeData, err := s.db.Get(append([]byte(fileHashToNodePrefix), []byte(fileHash)...))
if err != nil {
return "", false
}
return string(nodeData), true
}
// CanAccess authorizes access.
func (s *Storage) CanAccess(token string) (bool, AccessToken, error) {
if token == "" {
return false, AccessToken{}, errors.New("token is empty")
}
data, err := s.db.Get(append([]byte(tokenPrefix), []byte(token)...))
if err != nil {
return false, AccessToken{}, err
}
accToken := AccessToken{}
err = json.Unmarshal(data, &accToken)
if err != nil {
return false, AccessToken{}, fmt.Errorf("failed to unmarshal access token: %w", err)
}
if time.Now().Unix() > accToken.ExpiresAt {
return false, AccessToken{}, errors.New("access token is expired")
}
return true, accToken, nil
}
func writeHeaderPayload(w http.ResponseWriter, status int, payload string) {
w.WriteHeader(status)
// nolint:errcheck
w.Write([]byte(payload))
}
// ServeHTTP handles file uploading.
func (s *Storage) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
if r.Method == "OPTIONS" {
return
}
if !s.enabled {
writeHeaderPayload(w, http.StatusForbidden, `{"error": "storage is not enabled"}`)
return
}
if r.Method != "POST" {
writeHeaderPayload(w, http.StatusMethodNotAllowed, `{"error": "method not available"}`)
return
}
can, _, err := s.CanAccess(r.Header.Get("Authorization"))
if !can {
writeHeaderPayload(w, http.StatusForbidden, `{"error": "`+err.Error()+`"}`)
return
}
reader, err := r.MultipartReader()
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
folderPath, err := s.CreateSubfolders()
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
nodeHash := ""
tmpFileHex := ""
fileName := ""
for {
part, err := reader.NextPart()
if err == io.EOF {
// done reading body
break
}
formName := part.FormName()
if formName == "node_hash" {
nodeHashData, err := io.ReadAll(part)
if err != nil {
log.Warnf("failed to read from multipart: %v", err)
}
nodeHash = string(nodeHashData)
continue
}
if formName == "file" {
fileName = part.FileName()
tmpFileName, err := crypto.RandomEntropy(40)
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
tmpFileHex = hexutil.Encode(tmpFileName)
destFile, err := os.Create(path.Join(folderPath, tmpFileHex))
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "failed to open file on the system"}`)
return
}
_, err = io.Copy(destFile, part)
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "failed to copy from multipart reader"}`)
return
}
}
part.Close()
}
if !validateFileName(fileName) {
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "file name is invalid"}`)
return
}
}
old := path.Join(folderPath, tmpFileHex)
fileSize, err := common.FileSize(old)
if err != nil {
os.Remove(old)
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "failed to get file's size"}`)
return
}
fHash, err := crypto.Sha1File(old)
if err != nil {
os.Remove(old)
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "failed to hash contents of file"}`)
return
}
newPath := path.Join(folderPath, fHash)
err = os.Rename(old, newPath)
if err != nil {
os.Remove(old)
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "failed to rename file to node hash"}`)
return
}
howManySegments, _, _, _ := common.FileSegmentsInfo(int(fileSize), s.merkleTreeTotalSegments, 0)
orderedSlice := make([]int, howManySegments)
for i := 0; i < howManySegments; i++ {
orderedSlice[i] = i
}
fMerkleRootHash, err := common.GetFileMerkleRootHash(newPath, s.merkleTreeTotalSegments, orderedSlice)
if err != nil {
os.Remove(old)
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "failed to get merkle root hash"}`)
return
}
fileName = html.EscapeString(fileName)
fileMetadata := FileMetadata{
FileName: fileName,
MerkleRootHash: hexutil.Encode(fMerkleRootHash),
Hash: fHash,
FilePath: newPath,
Size: fileSize,
}
nodeHashDB, fileHashExistsInDB := s.GetNodeHashFromFileHash(fHash)
if fileHashExistsInDB {
fileMetadata, err = s.GetFileMetadata(nodeHashDB)
if err != nil {
os.Remove(newPath)
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
}
err = s.SaveFileMetadata(nodeHash, fHash, fileMetadata)
if err != nil {
os.Remove(newPath)
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
writeHeaderPayload(w, http.StatusOK, fmt.Sprintf(`{"file_name":"%s","file_hash": "%s", "merkle_root_hash": "%s", "size": %d}`, fileMetadata.FileName, fileMetadata.Hash, fileMetadata.MerkleRootHash, fileMetadata.Size))
}
// Authenticate authenticates storage access.
func (s *Storage) Authenticate(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
if r.Method == "OPTIONS" {
return
}
if !s.enabled {
writeHeaderPayload(w, http.StatusForbidden, `{"error": "storage is not enabled"}`)
return
}
if r.Method != "POST" {
writeHeaderPayload(w, http.StatusMethodNotAllowed, `{"error": "method not available"}`)
return
}
can, accessToken, err := s.CanAccess(r.Header.Get("Authorization"))
if !can {
writeHeaderPayload(w, http.StatusForbidden, `{"error": "`+err.Error()+`"}`)
return
}
if accessToken.AccessType != AdminAccess {
writeHeaderPayload(w, http.StatusUnauthorized, `{"error": "not authorized to perform this operation"}`)
return
}
randomBytes, err := crypto.RandomEntropy(60)
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
// create a user token
token := AccessToken{
AccessType: UserAccess,
Token: hexutil.Encode(randomBytes),
ExpiresAt: time.Now().Add(time.Hour * tokenAccessHours).Unix(),
}
err = s.SaveToken(token)
if err != nil {
writeHeaderPayload(w, http.StatusInternalServerError, `{"error": "`+err.Error()+`"}`)
return
}
writeHeaderPayload(w, http.StatusOK, `{"token": "`+token.Token+`"}`)
}
func validateFileName(fileName string) bool {
// Clean the file name
fileName = filepath.Clean(fileName)
// Define a regular expression pattern for valid file names
pattern := "^[^<>:\"/\\\\|?*\\x00-\\x1F]+(?: [^<>:\"/\\\\|?*\\x00-\\x1F]+)*$"
// Compile the regular expression
regex, err := regexp.Compile(pattern)
if err != nil {
// Handle the error
return false
}
// Check if the file name matches the pattern
return regex.MatchString(fileName)
}