webdav: add "fastmail" provider for Fastmail Files

This provider:

- supports the `X-OC-Mtime` header to set the mtime

- calculates SHA1 checksum server side and returns it as a `ME:sha1hex` prop

To differentiate the new hasMESHA1 quirk, the existing hasMD5 and hasSHA1
quirks for Owncloud have been renamed to hasOCMD5 and hasOCSHA1.

Fixes #6837

docs/content/_index.md

@@ -121,6 +121,7 @@ WebDAV or S3, that work out of the box.)
 {{< provider name="Dreamhost" home="https://www.dreamhost.com/cloud/storage/" config="/s3/#dreamhost" >}}
 {{< provider name="Dropbox" home="https://www.dropbox.com/" config="/dropbox/" >}}
 {{< provider name="Enterprise File Fabric" home="https://storagemadeeasy.com/about/" config="/filefabric/" >}}
+{{< provider name="Fastmail Files" home="https://www.fastmail.com/" config="/webdav/#fastmail-files" >}}
 {{< provider name="FTP" home="https://en.wikipedia.org/wiki/File_Transfer_Protocol" config="/ftp/" >}}
 {{< provider name="Google Cloud Storage" home="https://cloud.google.com/storage/" config="/googlecloudstorage/" >}}
 {{< provider name="Google Drive" home="https://www.google.com/drive/" config="/drive/" >}}

docs/content/overview.md

@@ -68,9 +68,9 @@ This is an SHA256 sum of all the 4 MiB block SHA256s.
 ² SFTP supports checksums if the same login has shell access and
 `md5sum` or `sha1sum` as well as `echo` are in the remote's PATH.
 
-³ WebDAV supports hashes when used with Owncloud and Nextcloud only.
+³ WebDAV supports hashes when used with Fastmail Files. Owncloud and Nextcloud only.
 
-⁴ WebDAV supports modtimes when used with Owncloud and Nextcloud only.
+⁴ WebDAV supports modtimes when used with Fastmail Files, Owncloud and Nextcloud only.
 
 ⁵ [QuickXorHash](https://docs.microsoft.com/en-us/onedrive/developer/code-snippets/quickxorhash) is Microsoft's own hash.
 

docs/content/webdav.md

@@ -43,17 +43,19 @@ Choose a number from below, or type in your own value
 url> https://example.com/remote.php/webdav/
 Name of the WebDAV site/service/software you are using
 Choose a number from below, or type in your own value
- 1 / Nextcloud
-   \ "nextcloud"
- 2 / Owncloud
-   \ "owncloud"
- 3 / Sharepoint Online, authenticated by Microsoft account.
-   \ "sharepoint"
- 4 / Sharepoint with NTLM authentication. Usually self-hosted or on-premises.
-   \ "sharepoint-ntlm"
- 5 / Other site/service or software
-   \ "other"
-vendor> 1
+ 1 / Fastmail Files
+   \ (fastmail)
+ 2 / Nextcloud
+   \ (nextcloud)
+ 3 / Owncloud
+   \ (owncloud)
+ 4 / Sharepoint Online, authenticated by Microsoft account
+   \ (sharepoint)
+ 5 / Sharepoint with NTLM authentication, usually self-hosted or on-premises
+   \ (sharepoint-ntlm)
+ 6 / Other site/service or software
+   \ (other)
+vendor> 2
 User name
 user> user
 Password.
@@ -100,10 +102,10 @@ To copy a local directory to an WebDAV directory called backup
 ### Modified time and hashes ###
 
 Plain WebDAV does not support modified times.  However when used with
-Owncloud or Nextcloud rclone will support modified times.
+Fastmail Files, Owncloud or Nextcloud rclone will support modified times.
 
 Likewise plain WebDAV does not support hashes, however when used with
-Owncloud or Nextcloud rclone will support SHA1 and MD5 hashes.
+Fastmail Files, Owncloud or Nextcloud rclone will support SHA1 and MD5 hashes.
 Depending on the exact version of Owncloud or Nextcloud hashes may
 appear on all objects, or only on objects which had a hash uploaded
 with them.
@@ -242,6 +244,16 @@ Properties:
 
 See below for notes on specific providers.
 
+## Fastmail Files
+
+Use `https://webdav.fastmail.com/` or a subdirectory as the URL,
+and your Fastmail email `username@domain.tld` as the username.
+Follow [this documentation](https://www.fastmail.help/hc/en-us/articles/360058752854-App-passwords)
+to create an app password with access to `Files (WebDAV)` and use
+this as the password.
+
+Fastmail supports modified times using the `X-OC-Mtime` header.
+
 ### Owncloud
 
 Click on the settings cog in the bottom right of the page and this