File

synapseclient.entity.File

Bases: Entity, Versionable

Represents a file in Synapse.

When a File object is stored, the associated local file or its URL will be stored in Synapse. A File must have a path (or URL) and a parent. By default, the name of the file in Synapse matches the filename, but by specifying the name attribute, the File Entity name can be different.

Changing File Names

A Synapse File Entity has a name separate from the name of the actual file it represents. When a file is uploaded to Synapse, its filename is fixed, even though the name of the entity can be changed at any time. Synapse provides a way to change this filename and the content-type of the file for future downloads by creating a new version of the file with a modified copy of itself. This can be done with the synapseutils.copy_functions.changeFileMetaData function.

import synapseutils
e = syn.get(synid)
print(os.path.basename(e.path))  ## prints, e.g., "my_file.txt"
e = synapseutils.changeFileMetaData(syn, e, "my_newname_file.txt")

Setting fileNameOverride will not change the name of a copy of the file that's already downloaded into your local cache. Either rename the local copy manually or remove it from the cache and re-download.:

syn.cache.remove(e.dataFileHandleId)
e = syn.get(e)
print(os.path.basename(e.path))  ## prints "my_newname_file.txt"

PARAMETER	DESCRIPTION
path	Location to be represented by this File DEFAULT: None
name	Name of the file in Synapse, not to be confused with the name within the path
parent	Project or Folder where this File is stored DEFAULT: None
synapseStore	Whether the File should be uploaded or if only the path should be stored when synapseclient.Synapse.store is called on the File object. DEFAULT: True
contentType	Manually specify Content-type header, for example "application/png" or "application/json; charset=UTF-8"
dataFileHandleId	Defining an existing dataFileHandleId will use the existing dataFileHandleId The creator of the file must also be the owner of the dataFileHandleId to have permission to store the file.
properties	A map of Synapse properties DEFAULT: None
annotations	A map of user defined annotations DEFAULT: None
local_state	Internal use only DEFAULT: None

Creating instances

Creating and storing a File

# The Entity name is derived from the path and is 'data.xyz'
data = File('/path/to/file/data.xyz', parent=folder)
data = syn.store(data)

Setting the name of the file in Synapse to 'my entity'

# The Entity name is specified as 'my entity'
data = File('/path/to/file/data.xyz', name="my entity", parent=folder)
data = syn.store(data)

Source code in synapseclient/entity.py

class File(Entity, Versionable):
    """
    Represents a file in Synapse.

    When a File object is stored, the associated local file or its URL will be stored in Synapse.
    A File must have a path (or URL) and a parent. By default, the name of the file in Synapse
    matches the filename, but by specifying the `name` attribute, the File Entity name can be different.

    ## Changing File Names

    A Synapse File Entity has a name separate from the name of the actual file it represents.
    When a file is uploaded to Synapse, its filename is fixed, even though the name of the entity
    can be changed at any time. Synapse provides a way to change this filename and the
    content-type of the file for future downloads by creating a new version of the file
    with a modified copy of itself. This can be done with the
    [synapseutils.copy_functions.changeFileMetaData][] function.

        import synapseutils
        e = syn.get(synid)
        print(os.path.basename(e.path))  ## prints, e.g., "my_file.txt"
        e = synapseutils.changeFileMetaData(syn, e, "my_newname_file.txt")

    Setting *fileNameOverride* will **not** change the name of a copy of the
    file that's already downloaded into your local cache. Either rename the
    local copy manually or remove it from the cache and re-download.:

        syn.cache.remove(e.dataFileHandleId)
        e = syn.get(e)
        print(os.path.basename(e.path))  ## prints "my_newname_file.txt"

    Parameters:
        path: Location to be represented by this File
        name: Name of the file in Synapse, not to be confused with the name within the path
        parent: Project or Folder where this File is stored
        synapseStore: Whether the File should be uploaded or if only the path should
                        be stored when [synapseclient.Synapse.store][] is called on the File object.
        contentType: Manually specify Content-type header, for example "application/png" or
                        "application/json; charset=UTF-8"
        dataFileHandleId: Defining an existing dataFileHandleId will use the existing dataFileHandleId
                            The creator of the file must also be the owner of the dataFileHandleId
                            to have permission to store the file.
        properties: A map of Synapse properties
        annotations: A map of user defined annotations
        local_state: Internal use only

    Example: Creating instances
        Creating and storing a File

            # The Entity name is derived from the path and is 'data.xyz'
            data = File('/path/to/file/data.xyz', parent=folder)
            data = syn.store(data)

        Setting the name of the file in Synapse to 'my entity'

            # The Entity name is specified as 'my entity'
            data = File('/path/to/file/data.xyz', name="my entity", parent=folder)
            data = syn.store(data)
    """

    # Note: externalURL technically should not be in the keys since it's only a field/member variable of
    # ExternalFileHandle, but for backwards compatibility it's included
    _file_handle_keys = [
        "createdOn",
        "id",
        "concreteType",
        "contentSize",
        "createdBy",
        "etag",
        "fileName",
        "contentType",
        "contentMd5",
        "storageLocationId",
        "externalURL",
    ]
    # Used for backwards compatability. The keys found below used to located in the entity's local_state
    # (i.e. __dict__).
    _file_handle_aliases = {
        "md5": "contentMd5",
        "externalURL": "externalURL",
        "fileSize": "contentSize",
        "contentType": "contentType",
    }
    _file_handle_aliases_inverse = {v: k for k, v in _file_handle_aliases.items()}

    _property_keys = (
        Entity._property_keys + Versionable._property_keys + ["dataFileHandleId"]
    )
    _local_keys = Entity._local_keys + [
        "path",
        "cacheDir",
        "files",
        "synapseStore",
        "_file_handle",
    ]
    _synapse_entity_type = "org.sagebionetworks.repo.model.FileEntity"

    # TODO: File(path="/path/to/file", synapseStore=True, parentId="syn101")
    def __init__(
        self,
        path=None,
        parent=None,
        synapseStore=True,
        properties=None,
        annotations=None,
        local_state=None,
        **kwargs,
    ):
        if path and "name" not in kwargs:
            kwargs["name"] = utils.guess_file_name(path)
        self.__dict__["path"] = path
        if path:
            cacheDir, basename = os.path.split(path)
            self.__dict__["cacheDir"] = cacheDir
            self.__dict__["files"] = [basename]
        else:
            self.__dict__["cacheDir"] = None
            self.__dict__["files"] = []
        self.__dict__["synapseStore"] = synapseStore

        # pop the _file_handle from local properties because it is handled differently from other local_state
        self._update_file_handle(
            local_state.pop("_file_handle", None) if (local_state is not None) else None
        )

        super(File, self).__init__(
            concreteType=File._synapse_entity_type,
            properties=properties,
            annotations=annotations,
            local_state=local_state,
            parent=parent,
            **kwargs,
        )

    def _update_file_handle(self, file_handle_update_dict=None):
        """Sets the file handle. Should not need to be called by users.

        Args:
            file_handle_update_dict: A dictionary containing the file handle information.
        """

        # replace the file handle dict
        fh_dict = (
            DictObject(file_handle_update_dict)
            if file_handle_update_dict is not None
            else DictObject()
        )
        self.__dict__["_file_handle"] = fh_dict

        if (
            file_handle_update_dict is not None
            and file_handle_update_dict.get("concreteType")
            == "org.sagebionetworks.repo.model.file.ExternalFileHandle"
            and urllib_parse.urlparse(file_handle_update_dict.get("externalURL")).scheme
            != "sftp"
        ):
            self.__dict__["synapseStore"] = False

        # initialize all nonexistent keys to have value of None
        for key in self.__class__._file_handle_keys:
            if key not in fh_dict:
                fh_dict[key] = None

    def __setitem__(self, key, value):
        if key == "_file_handle":
            self._update_file_handle(value)
        elif key in self.__class__._file_handle_aliases:
            self._file_handle[self.__class__._file_handle_aliases[key]] = value
        else:

            def expand_and_convert_to_URL(path):
                return utils.as_url(os.path.expandvars(os.path.expanduser(path)))

            # hacky solution to allowing immediate switching into a ExternalFileHandle pointing to the current path
            # yes, there is boolean zen but I feel like it is easier to read/understand this way
            if (
                key == "synapseStore"
                and value is False
                and self["synapseStore"] is True
                and utils.caller_module_name(inspect.currentframe()) != "client"
            ):
                self["externalURL"] = expand_and_convert_to_URL(self["path"])

            # hacky solution because we historically allowed modifying 'path' to indicate wanting to change to a new
            # ExternalFileHandle
            # don't change exernalURL if it's just the synapseclient setting metadata after a function call such as
            # syn.get()
            if (
                key == "path"
                and not self["synapseStore"]
                and utils.caller_module_name(inspect.currentframe()) != "client"
                and utils.caller_module_name(inspect.currentframe())
                != "download_functions"
            ):
                self["externalURL"] = expand_and_convert_to_URL(value)
                self["contentMd5"] = None
                self["contentSize"] = None
            super(File, self).__setitem__(key, value)

    def __getitem__(self, item):
        if item in self.__class__._file_handle_aliases:
            return self._file_handle[self.__class__._file_handle_aliases[item]]
        else:
            return super(File, self).__getitem__(item)

    def _str_localstate(self, f):
        self._write_kvps(
            f,
            self._file_handle,
            lambda key: key
            in ["externalURL", "contentMd5", "contentSize", "contentType"],
            self._file_handle_aliases_inverse,
        )
        self._write_kvps(
            f,
            self.__dict__,
            lambda key: not (
                key in ["properties", "annotations", "_file_handle"]
                or key.startswith("__")
            ),
        )