paramiko.SFTPServerInterface

Package paramiko :: Class SFTPServerInterface |
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## Type SFTPServerInterface

    object --+
             |
            SFTPServerInterface

This class defines an interface for controlling the behavior of paramiko when using the `SFTPServer` subsystem to provide an SFTP server.

Methods on this class are called from the SFTP session's thread, so you can block as long as necessary without affecting other sessions (even other SFTP sessions). However, raising an exception will usually cause the SFTP session to abruptly end, so you will usually want to catch exceptions and return an appropriate error code.

Method Summary
| ``__init__`(self, server, *largs, **kwargs)` Create a new SFTPServerInterface object.
| ``canonicalize`(self, path)` Return the canonical form of a path on the server.
int | ``chattr`(self, path, attr)` Change the attributes of a file.
list of `SFTPAttributes` or error code | ``list_folder`(self, path)` Return a list of files within a given folder.
`SFTPAttributes` or error code | ``lstat`(self, path)` Return an `SFTPAttributes` object for a path on the server, or an error code.
int | ``mkdir`(self, path, attr)` Create a new directory with the given attributes.
| ``open`(self, path, flags, attr)` Open a file on the server and create a handle for future operations on that file.
str or error code | ``readlink`(self, path)` Return the target of a symbolic link (or shortcut) on the server.
int | ``remove`(self, path)` Delete a file, if possible.
int | ``rename`(self, oldpath, newpath)` Rename (or move) a file.
int | ``rmdir`(self, path)` Remove a directory if it exists.
| ``session_ended`(self)` The SFTP server session has just ended, either cleanly or via an exception.
| ``session_started`(self)` The SFTP server session has just started.
`SFTPAttributes` or error code | ``stat`(self, path)` Return an `SFTPAttributes` object for a path on the server, or an error code.
int | ``symlink`(self, target_path, path)` Create a symbolic link on the server, as new pathname `path`, with `target_path` as the target of the link.
Inherited from object
| ``__delattr__`(...)` x.__delattr__('name') <==> del x.name
| ``__getattribute__`(...)` x.__getattribute__('name') <==> x.name
| ``__hash__`(x)` x.__hash__() <==> hash(x)
| ``__new__`(T, S, ...)` T.__new__(S, ...) -> a new object with type S, a subtype of T
| ``__reduce__`(...)` helper for pickle
| ``__reduce_ex__`(...)` helper for pickle
| ``__repr__`(x)` x.__repr__() <==> repr(x)
| ``__setattr__`(...)` x.__setattr__('name', value) <==> x.name = value
| ``__str__`(x)` x.__str__() <==> str(x)

Method Details

### __init__(self, server, *largs, **kwargs) (Constructor) Create a new SFTPServerInterface object. This method does nothing by default and is meant to be overridden by subclasses. Parameters: `server` - the server object associated with this channel and SFTP subsystem (type=`ServerInterface`) Overrides: `__builtin__.object.__init__`

### canonicalize(self, path) Return the canonical form of a path on the server. For example, if the server's home folder is `/home/foo`, the path `"../betty"` would be canonicalized to `"/home/betty"`. Note the obvious security issues: if you're serving files only from a specific folder, you probably don't want this method to reveal path names outside that folder. You may find the python methods in `os.path` useful, especially `os.path.normpath` and `os.path.realpath`. The default implementation returns `os.path.normpath('/' + path)`.

### chattr(self, path, attr) Change the attributes of a file. The `attr` object will contain only those fields provided by the client in its request, so you should check for the presence of fields before using them. Parameters: `path` - requested path (relative or absolute) of the file to change. (type=str) `attr` - requested attributes to change on the file. (type=`SFTPAttributes`) Returns: an error code like `SFTP_OK`. (type=int)

### list_folder(self, path) Return a list of files within a given folder. The `path` will use posix notation (`"/"` separates folder names) and may be an absolute or relative path. The list of files is expected to be a list of `SFTPAttributes` objects, which are similar in structure to the objects returned by `os.stat`. In addition, each object should have its `filename` field filled in, since this is important to a directory listing and not normally present in `os.stat` results. The method `SFTPAttributes.from_stat` will usually do what you want. In case of an error, you should return one of the `SFTP_*` error codes, such as `SFTP_PERMISSION_DENIED`. Parameters: `path` - the requested path (relative or absolute) to be listed. (type=str) Returns: a list of the files in the given folder, using `SFTPAttributes` objects. (type=list of `SFTPAttributes` or error code) Note: You should normalize the given `path` first (see the `os.path` module) and check appropriate permissions before returning the list of files. Be careful of malicious clients attempting to use relative paths to escape restricted folders, if you're doing a direct translation from the SFTP server path to your local filesystem.

### lstat(self, path) Return an `SFTPAttributes` object for a path on the server, or an error code. If your server supports symbolic links (also known as "aliases"), you should not follow them -- instead, you should return data on the symlink or alias itself. (`stat` is the corresponding call that follows symlinks/aliases.) Parameters: `path` - the requested path (relative or absolute) to fetch file statistics for. (type=str) Returns: an attributes object for the given file, or an SFTP error code (like `SFTP_PERMISSION_DENIED`). (type=`SFTPAttributes` or error code)

### mkdir(self, path, attr) Create a new directory with the given attributes. The `attr` object may be considered a "hint" and ignored. The `attr` object will contain only those fields provided by the client in its request, so you should use `hasattr` to check for the presense of fields before using them. In some cases, the `attr` object may be completely empty. Parameters: `path` - requested path (relative or absolute) of the new folder. (type=str) `attr` - requested attributes of the new folder. (type=`SFTPAttributes`) Returns: an SFTP error code like `SFTP_OK`. (type=int)

### open(self, path, flags, attr) Open a file on the server and create a handle for future operations on that file. On success, a new object subclassed from `SFTPHandle` should be returned. This handle will be used for future operations on the file (read, write, etc). On failure, an error code such as `SFTP_PERMISSION_DENIED` should be returned. `flags` contains the requested mode for opening (read-only, write-append, etc) as a bitset of flags from the `os` module: `os.O_RDONLY` `os.O_WRONLY` `os.O_RDWR` `os.O_APPEND` `os.O_CREAT` `os.O_TRUNC` `os.O_EXCL` (One of `os.O_RDONLY`, `os.O_WRONLY`, or `os.O_RDWR` will always be set.) The `attr` object contains requested attributes of the file if it has to be created. Some or all attribute fields may be missing if the client didn't specify them. Parameters: `path` - the requested path (relative or absolute) of the file to be opened. (type=str) `flags` - flags or'd together from the `os` module indicating the requested mode for opening the file. (type=int) `attr` - requested attributes of the file if it is newly created. (type=`SFTPAttributes`) Returns: a new `SFTPHandle` or error code. @rtype `SFTPHandle` Note: The SFTP protocol defines all files to be in "binary" mode. There is no equivalent to python's "text" mode.

### readlink(self, path) Return the target of a symbolic link (or shortcut) on the server. If the specified path doesn't refer to a symbolic link, an error should be returned. Parameters: `path` - path (relative or absolute) of the symbolic link. (type=str) Returns: the target path of the symbolic link, or an error code like `SFTP_NO_SUCH_FILE`. (type=str or error code)

### remove(self, path) Delete a file, if possible. Parameters: `path` - the requested path (relative or absolute) of the file to delete. (type=str) Returns: an SFTP error code like `SFTP_OK`. (type=int)

### rename(self, oldpath, newpath) Rename (or move) a file. The SFTP specification implies that this method can be used to move an existing file into a different folder, and since there's no other (easy) way to move files via SFTP, it's probably a good idea to implement "move" in this method too, even for files that cross disk partition boundaries, if at all possible. Parameters: `oldpath` - the requested path (relative or absolute) of the existing file. (type=str) `newpath` - the requested new path of the file. (type=str) Returns: an SFTP error code like `SFTP_OK`. (type=int) Note: You should return an error if a file with the same name as `newpath` already exists. (The rename operation should be non-desctructive.)

### rmdir(self, path) Remove a directory if it exists. The `path` should refer to an existing, empty folder -- otherwise this method should return an error. Parameters: `path` - requested path (relative or absolute) of the folder to remove. (type=str) Returns: an SFTP error code like `SFTP_OK`. (type=int)

### session_ended(self) The SFTP server session has just ended, either cleanly or via an exception. This method is meant to be overridden to perform any necessary cleanup before this `SFTPServerInterface` object is destroyed.

### session_started(self) The SFTP server session has just started. This method is meant to be overridden to perform any necessary setup before handling callbacks from SFTP operations.

### stat(self, path) Return an `SFTPAttributes` object for a path on the server, or an error code. If your server supports symbolic links (also known as "aliases"), you should follow them. (`lstat` is the corresponding call that doesn't follow symlinks/aliases.) Parameters: `path` - the requested path (relative or absolute) to fetch file statistics for. (type=str) Returns: an attributes object for the given file, or an SFTP error code (like `SFTP_PERMISSION_DENIED`). (type=`SFTPAttributes` or error code)

### symlink(self, target_path, path) Create a symbolic link on the server, as new pathname `path`, with `target_path` as the target of the link. Parameters: `target_path` - path (relative or absolute) of the target for this new symbolic link. (type=str) `path` - path (relative or absolute) of the symbolic link to create. (type=str) Returns: an error code like `SFTP_OK`. (type=int)

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