Example #1
0
def addon_view_or_download_quickfile(**kwargs):
    fid = kwargs.get('fid', 'NOT_AN_FID')
    file_ = OsfStorageFile.load(fid)
    if not file_:
        raise HTTPError(httplib.NOT_FOUND, data={
            'message_short': 'File Not Found',
            'message_long': 'The requested file could not be found.'
        })
    return proxy_url('/project/{}/files/osfstorage/{}/'.format(file_.target._id, fid))
Example #2
0
def resolve_guid(guid, suffix=None):
    """Resolve GUID to corresponding URL and return result of appropriate
    view function. This effectively yields a redirect without changing the
    displayed URL of the page.

    :param guid: GUID value (not the object)
    :param suffix: String to append to GUID route
    :return: Werkzeug response

    """
    # Get prefix; handles API routes
    prefix = request.path.split(guid)[0].rstrip('/')
    # Look up GUID
    guid_object = Guid.load(guid)
    if guid_object:

        # verify that the object is a GuidStoredObject descendant. If a model
        #   was once a descendant but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a redirect_mode attribute or otherwise don't behave as
        #   expected.
        if not isinstance(guid_object.referent, GuidStoredObject):
            sentry.log_message(
                'Guid `{}` resolved to non-guid object'.format(guid)
            )

            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        mode = referent.redirect_mode
        if mode is None:
            raise HTTPError(http.NOT_FOUND)
        url = referent.deep_url if mode == 'proxy' else referent.url
        url = _build_guid_url(url, prefix, suffix)
        # Always redirect API URLs; URL should identify endpoint being called
        if prefix or mode == 'redirect':
            if request.query_string:
                url += '?' + request.query_string
            return redirect(url)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(
                guid.lower(), prefix, suffix
            )
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #3
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    try:
        # Look up
        guid_object = Guid.load(guid)
    except KeyError as e:
        if e.message == 'osfstorageguidfile':  # Used when an old detached OsfStorageGuidFile object is accessed
            raise HTTPError(http.NOT_FOUND)
        else:
            raise e
    if guid_object:

        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid `{}` resolved to an object with no deep_url'.format(guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)
        if isinstance(referent, PreprintService):
            return send_from_directory(
                os.path.abspath(os.path.join(os.getcwd(), EXTERNAL_EMBER_APPS['preprints']['path'])),
                'index.html'
            )
        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #4
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    try:
        # Look up
        guid_object = Guid.load(guid)
    except KeyError as e:
        if e.message == 'osfstorageguidfile':  # Used when an old detached OsfStorageGuidFile object is accessed
            raise HTTPError(http.NOT_FOUND)
        else:
            raise e
    if guid_object:

        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid `{}` resolved to an object with no deep_url'.format(guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)
        if isinstance(referent, PreprintService):
            return send_from_directory(
                os.path.abspath(os.path.join(os.getcwd(), EXTERNAL_EMBER_APPS['preprints']['path'])),
                'index.html'
            )
        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #5
0
def resolve_guid(guid, suffix=None):
    """Resolve GUID to corresponding URL and return result of appropriate
    view function. This effectively yields a redirect without changing the
    displayed URL of the page.

    :param guid: GUID value (not the object)
    :param suffix: String to append to GUID route
    :return: Werkzeug response

    """
    # Get prefix; handles API routes
    prefix = request.path.split(guid)[0].rstrip('/')

    # Look up GUID
    guid_object = Guid.load(guid)
    if guid_object:

        # verify that the object is a GuidStoredObject descendant. If a model
        #   was once a descendant but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a redirect_mode attribute or otherwise don't behave as
        #   expected.
        if not isinstance(guid_object.referent, GuidStoredObject):
            sentry.log_message(
                'Guid `{}` resolved to non-guid object'.format(guid))

            raise HTTPError(http.NOT_FOUND)

        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        mode = referent.redirect_mode
        if mode is None:
            raise HTTPError(http.NOT_FOUND)
        url = referent.deep_url if mode == 'proxy' else referent.url
        url = _build_guid_url(url, prefix, suffix)
        # Always redirect API URLs; URL should identify endpoint being called
        if prefix or mode == 'redirect':
            if request.query_string:
                url += '?' + request.query_string
            return redirect(url)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(_build_guid_url(guid.lower(), prefix, suffix))

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #6
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    # Look up GUID
    guid_object = Guid.load(guid)
    if guid_object:

        # verify that the object is a GuidStoredObject descendant. If a model
        #   was once a descendant but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a redirect_mode attribute or otherwise don't behave as
        #   expected.
        if not isinstance(guid_object.referent, GuidStoredObject):
            sentry.log_message(
                'Guid `{}` resolved to non-guid object'.format(guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)
        url = _build_guid_url(referent.deep_url, suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #7
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    # Look up GUID
    guid_object = Guid.load(guid)
    if guid_object:

        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid `{}` resolved to an object with no deep_url'.format(guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)
        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #8
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    try:
        # Look up
        guid_object = Guid.load(guid)
    except KeyError as e:
        if e.message == 'osfstorageguidfile':  # Used when an old detached OsfStorageGuidFile object is accessed
            raise HTTPError(http.NOT_FOUND)
        else:
            raise e
    if guid_object:
        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid resolved to an object with no deep_url', dict(guid=guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)

        # Handle file `/download` shortcut with supported types.
        if suffix and suffix.rstrip('/').lower() == 'download':
            file_referent = None
            if isinstance(referent, Preprint) and referent.primary_file:
                file_referent = referent.primary_file
            elif isinstance(referent, BaseFileNode) and referent.is_file:
                file_referent = referent

            if file_referent:
                if isinstance(file_referent.target, Preprint) and not file_referent.target.is_published:
                    # TODO: Ideally, permissions wouldn't be checked here.
                    # This is necessary to prevent a logical inconsistency with
                    # the routing scheme - if a preprint is not published, only
                    # admins and moderators should be able to know it exists.
                    auth = Auth.from_kwargs(request.args.to_dict(), {})
                    # Check if user isn't a nonetype or that the user has admin/moderator/superuser permissions
                    if auth.user is None or not (auth.user.has_perm('view_submissions', file_referent.target.provider) or
                            file_referent.target.has_permission(auth.user, permissions.ADMIN)):
                        raise HTTPError(http.NOT_FOUND)

                # Extend `request.args` adding `action=download`.
                request.args = request.args.copy()
                request.args.update({'action': 'download'})
                # Do not include the `download` suffix in the url rebuild.
                url = _build_guid_url(urllib.unquote(file_referent.deep_url))
                return proxy_url(url)

        # Handle Ember Applications
        if isinstance(referent, Preprint):
            if referent.provider.domain_redirect_enabled:
                # This route should always be intercepted by nginx for the branded domain,
                # w/ the exception of `<guid>/download` handled above.
                return redirect(referent.absolute_url, http.MOVED_PERMANENTLY)

            if PROXY_EMBER_APPS:
                resp = requests.get(EXTERNAL_EMBER_APPS['preprints']['server'], stream=True, timeout=EXTERNAL_EMBER_SERVER_TIMEOUT)
                return Response(stream_with_context(resp.iter_content()), resp.status_code)

            return send_from_directory(preprints_dir, 'index.html')

        if isinstance(referent, BaseFileNode) and referent.is_file and (getattr(referent.target, 'is_quickfiles', False)):
            if referent.is_deleted:
                raise HTTPError(http.GONE)
            if PROXY_EMBER_APPS:
                resp = requests.get(EXTERNAL_EMBER_APPS['ember_osf_web']['server'], stream=True, timeout=EXTERNAL_EMBER_SERVER_TIMEOUT)
                return Response(stream_with_context(resp.iter_content()), resp.status_code)

            return send_from_directory(ember_osf_web_dir, 'index.html')

        if isinstance(referent, Registration) and (
                not suffix or suffix.rstrip('/').lower() in ('comments', 'links', 'components')
        ):
            if flag_is_active(request, features.EMBER_REGISTRIES_DETAIL_PAGE):
                # Route only the base detail view to ember
                if PROXY_EMBER_APPS:
                    resp = requests.get(EXTERNAL_EMBER_APPS['ember_osf_web']['server'], stream=True, timeout=EXTERNAL_EMBER_SERVER_TIMEOUT)
                    return Response(stream_with_context(resp.iter_content()), resp.status_code)

                return send_from_directory(registries_dir, 'index.html')

        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #9
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    try:
        # Look up
        guid_object = Guid.load(guid)
    except KeyError as e:
        if e.message == 'osfstorageguidfile':  # Used when an old detached OsfStorageGuidFile object is accessed
            raise HTTPError(http.NOT_FOUND)
        else:
            raise e
    if guid_object:
        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid resolved to an object with no deep_url', dict(guid=guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)

        # Handle file `/download` shortcut with supported types.
        if suffix and suffix.rstrip('/').lower() == 'download':
            file_referent = None
            if isinstance(referent, PreprintService) and referent.primary_file:
                if not referent.is_published:
                    # TODO: Ideally, permissions wouldn't be checked here.
                    # This is necessary to prevent a logical inconsistency with
                    # the routing scheme - if a preprint is not published, only
                    # admins and moderators should be able to know it exists.
                    auth = Auth.from_kwargs(request.args.to_dict(), {})
                    group_helper = GroupHelper(referent.provider)
                    admin_group = group_helper.get_group('admin')
                    mod_group = group_helper.get_group('moderator')
                    # Check if user isn't a nonetype or that the user has admin/moderator permissions
                    if auth.user is None or not (referent.node.has_permission(auth.user, permissions.ADMIN) or (mod_group.user_set.all() | admin_group.user_set.all()).filter(id=auth.user.id).exists()):
                        raise HTTPError(http.NOT_FOUND)
                file_referent = referent.primary_file
            elif isinstance(referent, BaseFileNode) and referent.is_file:
                file_referent = referent

            if file_referent:
                # Extend `request.args` adding `action=download`.
                request.args = request.args.copy()
                request.args.update({'action': 'download'})
                # Do not include the `download` suffix in the url rebuild.
                url = _build_guid_url(urllib.unquote(file_referent.deep_url))
                return proxy_url(url)

        # Handle Ember Applications
        if isinstance(referent, PreprintService):
            if referent.provider.domain_redirect_enabled:
                # This route should always be intercepted by nginx for the branded domain,
                # w/ the exception of `<guid>/download` handled above.
                return redirect(referent.absolute_url, http.MOVED_PERMANENTLY)

            if PROXY_EMBER_APPS:
                resp = requests.get(EXTERNAL_EMBER_APPS['preprints']['server'], stream=True, timeout=EXTERNAL_EMBER_SERVER_TIMEOUT)
                return Response(stream_with_context(resp.iter_content()), resp.status_code)

            return send_from_directory(preprints_dir, 'index.html')

        if isinstance(referent, BaseFileNode) and referent.is_file and referent.node.is_quickfiles:
            if referent.is_deleted:
                raise HTTPError(http.GONE)
            if PROXY_EMBER_APPS:
                resp = requests.get(EXTERNAL_EMBER_APPS['ember_osf_web']['server'], stream=True, timeout=EXTERNAL_EMBER_SERVER_TIMEOUT)
                return Response(stream_with_context(resp.iter_content()), resp.status_code)

            return send_from_directory(ember_osf_web_dir, 'index.html')

        if isinstance(referent, Node) and not referent.is_registration and suffix:
            page = suffix.strip('/').split('/')[0]
            flag_name = 'ember_project_{}_page'.format(page)
            request.user = _get_current_user() or MockUser()

            if waffle.flag_is_active(request, flag_name):
                use_ember_app()

        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #10
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    try:
        # Look up
        guid_object = Guid.load(guid)
    except KeyError as e:
        if e.message == 'osfstorageguidfile':  # Used when an old detached OsfStorageGuidFile object is accessed
            raise HTTPError(http.NOT_FOUND)
        else:
            raise e
    if guid_object:
        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid `{}` resolved to an object with no deep_url'.format(
                    guid))
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)

        # Handle file `/download` shortcut with supported types.
        if suffix and suffix.rstrip('/').lower() == 'download':
            file_referent = None
            if isinstance(referent, PreprintService) and referent.primary_file:
                if not referent.is_published:
                    # TODO: Ideally, permissions wouldn't be checked here.
                    # This is necessary to prevent a logical inconsistency with
                    # the routing scheme - if a preprint is not published, only
                    # admins should be able to know it exists.
                    auth = Auth.from_kwargs(request.args.to_dict(), {})
                    if not referent.node.has_permission(
                            auth.user, permissions.ADMIN):
                        raise HTTPError(http.NOT_FOUND)
                file_referent = referent.primary_file
            elif isinstance(referent, BaseFileNode) and referent.is_file:
                file_referent = referent

            if file_referent:
                # Extend `request.args` adding `action=download`.
                request.args = request.args.copy()
                request.args.update({'action': 'download'})
                # Do not include the `download` suffix in the url rebuild.
                url = _build_guid_url(urllib.unquote(file_referent.deep_url))
                return proxy_url(url)

        # Handle Ember Applications
        if isinstance(referent, PreprintService):
            if referent.provider.domain_redirect_enabled:
                # This route should always be intercepted by nginx for the branded domain,
                # w/ the exception of `<guid>/download` handled above.
                return redirect(referent.absolute_url, http.MOVED_PERMANENTLY)

            return send_from_directory(preprints_dir, 'index.html')
        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(_build_guid_url(guid.lower(), suffix))

    # GUID not found
    raise HTTPError(http.NOT_FOUND)
Example #11
0
def resolve_guid(guid, suffix=None):
    """Load GUID by primary key, look up the corresponding view function in the
    routing table, and return the return value of the view function without
    changing the URL.

    :param str guid: GUID primary key
    :param str suffix: Remainder of URL after the GUID
    :return: Return value of proxied view function
    """
    try:
        # Look up
        guid_object = Guid.load(guid)
    except KeyError as e:
        if e.message == 'osfstorageguidfile':  # Used when an old detached OsfStorageGuidFile object is accessed
            raise HTTPError(http.NOT_FOUND)
        else:
            raise e
    if guid_object:
        # verify that the object implements a GuidStoredObject-like interface. If a model
        #   was once GuidStoredObject-like but that relationship has changed, it's
        #   possible to have referents that are instances of classes that don't
        #   have a deep_url attribute or otherwise don't behave as
        #   expected.
        if not hasattr(guid_object.referent, 'deep_url'):
            sentry.log_message(
                'Guid resolved to an object with no deep_url', dict(guid=guid)
            )
            raise HTTPError(http.NOT_FOUND)
        referent = guid_object.referent
        if referent is None:
            logger.error('Referent of GUID {0} not found'.format(guid))
            raise HTTPError(http.NOT_FOUND)
        if not referent.deep_url:
            raise HTTPError(http.NOT_FOUND)

        # Handle file `/download` shortcut with supported types.
        if suffix and suffix.rstrip('/').lower() == 'download':
            file_referent = None
            if isinstance(referent, PreprintService) and referent.primary_file:
                if not referent.is_published:
                    # TODO: Ideally, permissions wouldn't be checked here.
                    # This is necessary to prevent a logical inconsistency with
                    # the routing scheme - if a preprint is not published, only
                    # admins should be able to know it exists.
                    auth = Auth.from_kwargs(request.args.to_dict(), {})
                    if not referent.node.has_permission(auth.user, permissions.ADMIN):
                        raise HTTPError(http.NOT_FOUND)
                file_referent = referent.primary_file
            elif isinstance(referent, BaseFileNode) and referent.is_file:
                file_referent = referent

            if file_referent:
                # Extend `request.args` adding `action=download`.
                request.args = request.args.copy()
                request.args.update({'action': 'download'})
                # Do not include the `download` suffix in the url rebuild.
                url = _build_guid_url(urllib.unquote(file_referent.deep_url))
                return proxy_url(url)

        # Handle Ember Applications
        if isinstance(referent, PreprintService):
            if referent.provider.domain_redirect_enabled:
                # This route should always be intercepted by nginx for the branded domain,
                # w/ the exception of `<guid>/download` handled above.
                return redirect(referent.absolute_url, http.MOVED_PERMANENTLY)

            return send_from_directory(preprints_dir, 'index.html')
        url = _build_guid_url(urllib.unquote(referent.deep_url), suffix)
        return proxy_url(url)

    # GUID not found; try lower-cased and redirect if exists
    guid_object_lower = Guid.load(guid.lower())
    if guid_object_lower:
        return redirect(
            _build_guid_url(guid.lower(), suffix)
        )

    # GUID not found
    raise HTTPError(http.NOT_FOUND)