feat(webdav): support range get

pkg/gowebdav/netrc.go

@@ -0,0 +1,54 @@
+package gowebdav
+
+import (
+	"bufio"
+	"fmt"
+	"net/url"
+	"os"
+	"regexp"
+	"strings"
+)
+
+func parseLine(s string) (login, pass string) {
+	fields := strings.Fields(s)
+	for i, f := range fields {
+		if f == "login" {
+			login = fields[i+1]
+		}
+		if f == "password" {
+			pass = fields[i+1]
+		}
+	}
+	return login, pass
+}
+
+// ReadConfig reads login and password configuration from ~/.netrc
+// machine foo.com login username password 123456
+func ReadConfig(uri, netrc string) (string, string) {
+	u, err := url.Parse(uri)
+	if err != nil {
+		return "", ""
+	}
+
+	file, err := os.Open(netrc)
+	if err != nil {
+		return "", ""
+	}
+	defer file.Close()
+
+	re := fmt.Sprintf(`^.*machine %s.*$`, u.Host)
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		s := scanner.Text()
+
+		matched, err := regexp.MatchString(re, s)
+		if err != nil {
+			return "", ""
+		}
+		if matched {
+			return parseLine(s)
+		}
+	}
+
+	return "", ""
+}