webdav: retry propfind on 425 status

This retries propfind on 425 status

In ownCloud Infinite Scale, files might be in that state if
postprocessing is still ongoing. All metadata are available anyway

Allow item status 425 "too early" for items when changing metadata

Fixes the upload behavior with ownCloud Infinite Scale

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>
Co-authored-by: Klaas Freitag <kraft@freisturz.de>

backend/webdav/api/types.go

@@ -82,22 +82,37 @@ type Prop struct {
 // Parse a status of the form "HTTP/1.1 200 OK" or "HTTP/1.1 200"
 var parseStatus = regexp.MustCompile(`^HTTP/[0-9.]+\s+(\d+)`)
 
-// StatusOK examines the Status and returns an OK flag
-func (p *Prop) StatusOK() bool {
-	// Assume OK if no statuses received
+// Code extracts the status code from the first status
+func (p *Prop) Code() int {
 	if len(p.Status) == 0 {
-		return true
+		return -1
 	}
 	match := parseStatus.FindStringSubmatch(p.Status[0])
 	if len(match) < 2 {
-		return false
+		return 0
 	}
 	code, err := strconv.Atoi(match[1])
 	if err != nil {
+		return 0
+	}
+	return code
+}
+
+// StatusOK examines the Status and returns an OK flag
+func (p *Prop) StatusOK() bool {
+	// Fetch status code as int
+	c := p.Code()
+
+	// Assume OK if no statuses received
+	if c == -1 {
+		return true
+	}
+	if c == 0 {
 		return false
 	}
-	if code >= 200 && code < 300 {
+	if c >= 200 && c < 300 {
 		return true
+
 	}
 	return false
 }

backend/webdav/webdav.go

@@ -262,6 +262,7 @@ func (f *Fs) Features() *fs.Features {
 // retryErrorCodes is a slice of error codes that we will retry
 var retryErrorCodes = []int{
 	423, // Locked
+	425, // Too Early
 	429, // Too Many Requests.
 	500, // Internal Server Error
 	502, // Bad Gateway
@@ -373,7 +374,8 @@ func (f *Fs) readMetaDataForPath(ctx context.Context, path string, depth string)
 		return nil, fs.ErrorObjectNotFound
 	}
 	item := result.Responses[0]
-	if !item.Props.StatusOK() {
+	// status code 425 is accepted here as well
+	if !(item.Props.StatusOK() || item.Props.Code() == 425) {
 		return nil, fs.ErrorObjectNotFound
 	}
 	if itemIsDir(&item) {