Fix WebDAV spelling, remove some inconsistencies (#143)

* Simplify logging, fix WebDAV spelling

* Define options types per package

* Move util functions that are not used cross package

* Add per file license headers

* Rename config type

internal/utilities/util.go

@@ -4,38 +4,11 @@
 package utilities
 
 import (
-	"bytes"
 	"errors"
-	"fmt"
-	"io"
-	"os"
 	"strings"
 )
 
-var Noop = func() error { return nil }
-
-// copy creates a copy of the file located at `dst` at `src`.
-func CopyFile(src, dst string) error {
-	in, err := os.Open(src)
-	if err != nil {
-		return err
-	}
-	defer in.Close()
-
-	out, err := os.Create(dst)
-	if err != nil {
-		return err
-	}
-
-	_, err = io.Copy(out, in)
-	if err != nil {
-		out.Close()
-		return err
-	}
-	return out.Close()
-}
-
-// join takes a list of errors and joins them into a single error
+// Join takes a list of errors and joins them into a single error
 func Join(errs ...error) error {
 	if len(errs) == 1 {
 		return errs[0]
@@ -49,42 +22,3 @@ func Join(errs ...error) error {
 	}
 	return errors.New("[" + strings.Join(msgs, ", ") + "]")
 }
-
-// remove removes the given file or directory from disk.
-func Remove(location string) error {
-	fi, err := os.Lstat(location)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return nil
-		}
-		return fmt.Errorf("remove: error checking for existence of `%s`: %w", location, err)
-	}
-	if fi.IsDir() {
-		err = os.RemoveAll(location)
-	} else {
-		err = os.Remove(location)
-	}
-	if err != nil {
-		return fmt.Errorf("remove: error removing `%s`: %w", location, err)
-	}
-	return nil
-}
-
-// buffer takes an io.Writer and returns a wrapped version of the
-// writer that writes to both the original target as well as the returned buffer
-func Buffer(w io.Writer) (io.Writer, *bytes.Buffer) {
-	buffering := &bufferingWriter{buf: bytes.Buffer{}, writer: w}
-	return buffering, &buffering.buf
-}
-
-type bufferingWriter struct {
-	buf    bytes.Buffer
-	writer io.Writer
-}
-
-func (b *bufferingWriter) Write(p []byte) (n int, err error) {
-	if n, err := b.buf.Write(p); err != nil {
-		return n, fmt.Errorf("bufferingWriter: error writing to buffer: %w", err)
-	}
-	return b.writer.Write(p)
-}