Add downloads as well

[rbdr/mobius] / hotline / file_path.go

diff --git a/hotline/file_path.go b/hotline/file_path.go
index 733dfaa64ceafce0bc6bd0f03e8c2c91a43789f2..bb6bbd312b62864591b893774930d23da5b19227 100644 (file)
--- a/hotline/file_path.go
+++ b/hotline/file_path.go
@@ -1,63 +1,137 @@
 package hotline
 
 import (
 package hotline
 
 import (

+       "bufio"
+       "bytes"

        "encoding/binary"
        "encoding/binary"

+       "errors"
+       "fmt"
+       "io"
+       "path/filepath"

        "strings"
 )
 
        "strings"
 )
 

-const pathSeparator = "/" // File path separator TODO: make configurable to support Windows
-

 // FilePathItem represents the file or directory portion of a delimited file path (e.g. foo and bar in "/foo/bar")
 // FilePathItem represents the file or directory portion of a delimited file path (e.g. foo and bar in "/foo/bar")

+// Example bytes:

 // 00 00
 // 09
 // 00 00
 // 09

-// 73 75 62 66 6f 6c 64 65 72 // "subfolder"
+// 73 75 62 66 6f 6c 64 65 72  "subfolder"

 type FilePathItem struct {
        Len  byte
        Name []byte
 }
 
 type FilePathItem struct {
        Len  byte
        Name []byte
 }
 

-func NewFilePathItem(b []byte) FilePathItem {
-       return FilePathItem{
-               Len:  b[2],
-               Name: b[3:],
+const fileItemMinLen = 3
+
+// fileItemScanner implements bufio.SplitFunc for parsing incoming byte slices into complete tokens
+func fileItemScanner(data []byte, _ bool) (advance int, token []byte, err error) {
+       if len(data) < fileItemMinLen {
+               return 0, nil, nil

        }
        }

+
+       advance = fileItemMinLen + int(data[2])
+       return advance, data[0:advance], nil
+}
+
+// Write implements the io.Writer interface for FilePathItem
+func (fpi *FilePathItem) Write(b []byte) (n int, err error) {
+       if len(b) < 3 {
+               return n, errors.New("buflen too small")
+       }
+       fpi.Len = b[2]
+       fpi.Name = b[fileItemMinLen : fpi.Len+fileItemMinLen]
+
+       return int(fpi.Len) + fileItemMinLen, nil

 }
 
 type FilePath struct {
 }
 
 type FilePath struct {

-       ItemCount []byte
+       ItemCount [2]byte

        Items     []FilePathItem
 }
 
        Items     []FilePathItem
 }
 

-func (fp *FilePath) UnmarshalBinary(b []byte) error {
-       fp.ItemCount = b[0:2]
+// Write implements io.Writer interface for FilePath
+func (fp *FilePath) Write(b []byte) (n int, err error) {
+       reader := bytes.NewReader(b)
+       err = binary.Read(reader, binary.BigEndian, &fp.ItemCount)
+       if err != nil && !errors.Is(err, io.EOF) {
+               return n, err
+       }
+       if errors.Is(err, io.EOF) {
+               return n, nil
+       }
+
+       scanner := bufio.NewScanner(reader)
+       scanner.Split(fileItemScanner)
+
+       for i := 0; i < int(binary.BigEndian.Uint16(fp.ItemCount[:])); i++ {
+               var fpi FilePathItem
+               scanner.Scan()

 
 

-       pathData := b[2:]
-       for i := uint16(0); i < fp.Len(); i++ {
-               segLen := pathData[2]
-               fp.Items = append(fp.Items, NewFilePathItem(pathData[:segLen+3]))
-               pathData = pathData[3+segLen:]
+               // Make a new []byte slice and copy the scanner bytes to it.  This is critical to avoid a data race as the
+               // scanner re-uses the buffer for subsequent scans.
+               buf := make([]byte, len(scanner.Bytes()))
+               copy(buf, scanner.Bytes())
+
+               if _, err := fpi.Write(buf); err != nil {
+                       return n, err
+               }
+               fp.Items = append(fp.Items, fpi)

        }
 
        }
 

-       return nil
+       return n, nil

 }
 
 }
 

-func (fp *FilePath) Len() uint16 {
-       return binary.BigEndian.Uint16(fp.ItemCount)
+// IsDropbox checks if a FilePath matches the special drop box folder type
+func (fp *FilePath) IsDropbox() bool {
+       if fp.Len() == 0 {
+               return false
+       }
+
+       return strings.Contains(strings.ToLower(string(fp.Items[fp.Len()-1].Name)), "drop box")

 }
 
 }
 

-func (fp *FilePath) String() string {
-       var out []string
-       for _, i := range fp.Items {
-               out = append(out, string(i.Name))
+func (fp *FilePath) IsUploadDir() bool {
+       if fp.Len() == 0 {
+               return false

        }
        }

-       return strings.Join(out, pathSeparator)
+
+       return strings.Contains(strings.ToLower(string(fp.Items[fp.Len()-1].Name)), "upload")

 }
 
 }
 

-func ReadFilePath(filePathFieldData []byte) string {
+func (fp *FilePath) IsUserDir() bool {
+    if fp.Len() == 0 {
+        return false
+    }
+
+    return strings.HasPrefix(string(fp.Items[0].Name), "~")
+}
+
+
+func (fp *FilePath) Len() uint16 {
+       return binary.BigEndian.Uint16(fp.ItemCount[:])
+}
+
+func ReadPath(fileRoot string, filePath, fileName []byte) (fullPath string, err error) {

        var fp FilePath
        var fp FilePath

-       err := fp.UnmarshalBinary(filePathFieldData)
+       if filePath != nil {
+               if _, err = fp.Write(filePath); err != nil {
+                       return "", err
+               }
+       }
+
+       var subPath string
+       for _, pathItem := range fp.Items {
+               subPath = filepath.Join("/", subPath, string(pathItem.Name))
+       }
+
+       fullPath = filepath.Join(
+               fileRoot,
+               subPath,
+               filepath.Join("/", string(fileName)),
+       )
+       fullPath, err = txtDecoder.String(fullPath)

        if err != nil {
        if err != nil {

-               // TODO
+               return "", fmt.Errorf("invalid filepath encoding: %w", err)

        }
        }

-       return fp.String()
+       return fullPath, nil

 }
 }