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� ?I�Qc @ sh d Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z y d d l m Z Wn! e k r� d d l m Z n Xd d l m Z d d l m Z y d d l m Z Wn! e k r!d d l m Z n Xd d l m Z d d l m Z d d l m Z m! Z! m" Z" m# Z# m$ Z$ d d l% m& Z& m' Z' e( � Z) e* d � e j+ j, e j+ j- g D� � Z. d � Z/ d � Z0 d � Z1 d � Z2 d � Z3 d d � Z4 e5 g d � Z6 d e5 d e8 d e5 d � Z9 d � Z: d � Z; d � Z< d � Z= d e( f d! � � YZ> d" e( f d# � � YZ? d S($ s� flask.helpers ~~~~~~~~~~~~~ Implements various helpers. :copyright: (c) 2011 by Armin Ronacher. :license: BSD, see LICENSE for more details. i����N( t time( t adler32( t RLock( t BuildError( t update_wrapper( t url_quote( t quote( t Headers( t NotFound( t wrap_file( t FileSystemLoaderi ( t message_flashed( t sessiont _request_ctx_stackt _app_ctx_stackt current_appt request( t string_typest text_typec c s! | ] } | d k r | Vq d S( t /N( NR ( t None( t .0t sep( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pys <genexpr>4 s c C s | j S( ss Internal helper that returns the default endpoint for a given function. This always is the function name. ( t __name__( t view_func( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt _endpoint_from_view_func8 s c sc y t � � � Wn* t k r< � f d � } t | � � SX� f d � } | � } t | � | S( s� Request contexts disappear when the response is started on the server. This is done for efficiency reasons and to make it less likely to encounter memory leaks with badly written WSGI middlewares. The downside is that if you are using streamed responses, the generator cannot access request bound information any more. This function however can help you keep the context around for longer:: from flask import stream_with_context, request, Response @app.route('/stream') def streamed_response(): @stream_with_context def generate(): yield 'Hello ' yield request.args['name'] yield '!' return Response(generate()) Alternatively it can also be used around a specific generator:: from flask import stream_with_context, request, Response @app.route('/stream') def streamed_response(): def generate(): yield 'Hello ' yield request.args['name'] yield '!' return Response(stream_with_context(generate())) .. versionadded:: 0.9 c s � � } t | � S( N( t stream_with_context( t argst kwargst gen( t generator_or_function( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt decoratorf s c 3 st t j } | d k r$ t d � � n | �D d Vz x � D] } | Vq: WWd t � d � ri � j � n XWd QXd S( Ns\ Attempted to stream with context but there was no context in the first place to keep around.t close( R t topR t RuntimeErrort hasattrR ( t ctxt item( R ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt generatork s ( t itert TypeErrorR t next( R R R& t wrapped_g( ( R R s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyR A s " c G s< | s t j � St | � d k r/ | d } n t j | � S( sy Sometimes it is necessary to set additional headers in a view. Because views do not have to return response objects but can return a value that is converted into a response object by Flask itself, it becomes tricky to add headers to it. This function can be called instead of using a return and you will get a response object which you can use to attach headers. If view looked like this and you want to add a new header:: def index(): return render_template('index.html', foo=42) You can now do something like this:: def index(): response = make_response(render_template('index.html', foo=42)) response.headers['X-Parachutes'] = 'parachutes are cool' return response This function accepts the very same arguments you can return from a view function. This for example creates a response with a 404 error code:: response = make_response(render_template('not_found.html'), 404) The other use case of this function is to force the return value of a view function into a response which is helpful with view decorators:: response = make_response(view_function()) response.headers['X-Parachutes'] = 'parachutes are cool' Internally this function does the following things: - if no arguments are passed, it creates a new response argument - if one argument is passed, :meth:`flask.Flask.make_response` is invoked with it. - if more than one argument is passed, the arguments are passed to the :meth:`flask.Flask.make_response` function as tuple. .. versionadded:: 0.6 i i ( R t response_classt lent make_response( R ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyR- � s * c K s) t j } t j } | d k r- t d � � n | d k r� | j } t j } | j j s� | d d k r� | d k r� | | } q� | d } q� nH d | k r� | d k r� | d | } q� n | j d � r� | d } n | j d t � } n6 | j } | d k rt d � � n | j d t � } | j d d � } | j d d � } | j d d � } | j j | | � | d k r�| s�t d � � n | | _ n y" | j | | d | d | �} WnD t k r} | | d <| | d <| | d <| j j | | | � SX| d k r%| d t | � 7} n | S( s� Generates a URL to the given endpoint with the method provided. Variable arguments that are unknown to the target endpoint are appended to the generated URL as query arguments. If the value of a query argument is `None`, the whole pair is skipped. In case blueprints are active you can shortcut references to the same blueprint by prefixing the local endpoint with a dot (``.``). This will reference the index function local to the current blueprint:: url_for('.index') For more information, head over to the :ref:`Quickstart <url-building>`. To integrate applications, :class:`Flask` has a hook to intercept URL build errors through :attr:`Flask.build_error_handler`. The `url_for` function results in a :exc:`~werkzeug.routing.BuildError` when the current app does not have a URL for the given endpoint and values. When it does, the :data:`~flask.current_app` calls its :attr:`~Flask.build_error_handler` if it is not `None`, which can return a string to use as the result of `url_for` (instead of `url_for`'s default to raise the :exc:`~werkzeug.routing.BuildError` exception) or re-raise the exception. An example:: def external_url_handler(error, endpoint, **values): "Looks up an external URL when `url_for` cannot build a URL." # This is an example of hooking the build_error_handler. # Here, lookup_url is some utility function you've built # which looks up the endpoint in some external URL registry. url = lookup_url(endpoint, **values) if url is None: # External lookup did not have a URL. # Re-raise the BuildError, in context of original traceback. exc_type, exc_value, tb = sys.exc_info() if exc_value is error: raise exc_type, exc_value, tb else: raise error # url_for will use this result, instead of raising BuildError. return url app.build_error_handler = external_url_handler Here, `error` is the instance of :exc:`~werkzeug.routing.BuildError`, and `endpoint` and `**values` are the arguments passed into `url_for`. Note that this is for building URLs outside the current application, and not for handling 404 NotFound errors. .. versionadded:: 0.10 The `_scheme` parameter was added. .. versionadded:: 0.9 The `_anchor` and `_method` parameters were added. .. versionadded:: 0.9 Calls :meth:`Flask.handle_build_error` on :exc:`~werkzeug.routing.BuildError`. :param endpoint: the endpoint of the URL (name of the function) :param values: the variable arguments of the URL rule :param _external: if set to `True`, an absolute URL is generated. Server address can be changed via `SERVER_NAME` configuration variable which defaults to `localhost`. :param _scheme: a string specifying the desired URL scheme. The `_external` parameter must be set to `True` or a `ValueError` is raised. :param _anchor: if provided this is added as anchor to the URL. :param _method: if provided this explicitly specifies an HTTP method. s� Attempted to generate a URL without the application context being pushed. This has to be executed when application context is available.i t .t _externals� Application was not able to create a URL adapter for request independent URL generation. You might be able to fix this by setting the SERVER_NAME config variable.t _anchort _methodt _schemes/ When specifying _scheme, _external must be Truet methodt force_externalt #N( R R! R R R" t url_adapterR t blueprintt _is_old_modulet startswitht popt Falset Truet appt inject_url_defaultst ValueErrort url_schemet buildR t handle_url_build_errorR ( t endpointt valuest appctxt reqctxR6 t blueprint_namet externalt anchorR3 t schemet rvt error( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt url_for� sR E c C s t t j j | � j | � S( sR Loads a macro (or variable) a template exports. This can be used to invoke a macro from within Python code. If you for example have a template named `_cider.html` with the following contents: .. sourcecode:: html+jinja {% macro hello(name) %}Hello {{ name }}!{% endmacro %} You can access this from Python code like this:: hello = get_template_attribute('_cider.html', 'hello') return hello('World') .. versionadded:: 0.2 :param template_name: the name of the template :param attribute: the name of the variable of macro to access ( t getattrR t jinja_envt get_templatet module( t template_namet attribute( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt get_template_attribute? s t messagec C sR t j d g � } | j | | f � | t d <t j t j � d | d | �d S( s� Flashes a message to the next request. In order to remove the flashed message from the session and to display it to the user, the template has to call :func:`get_flashed_messages`. .. versionchanged:: 0.3 `category` parameter added. :param message: the message to be flashed. :param category: the category for the message. The following values are recommended: ``'message'`` for any kind of message, ``'error'`` for errors, ``'info'`` for information messages and ``'warning'`` for warnings. However any kind of string can be used as category. t _flashesRU t categoryN( R t gett appendR t sendR t _get_current_object( RU RW t flashes( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt flashV s c s� t j j } | d k rF d t k r3 t j d � n g t j _ } n � rm t t � f d � | � � } n | s� g | D] } | d ^ qz S| S( s� Pulls all flashed messages from the session and returns them. Further calls in the same request to the function will return the same messages. By default just the messages are returned, but when `with_categories` is set to `True`, the return value will be a list of tuples in the form ``(category, message)`` instead. Filter the flashed messages to one or more categories by providing those categories in `category_filter`. This allows rendering categories in separate html blocks. The `with_categories` and `category_filter` arguments are distinct: * `with_categories` controls whether categories are returned with message text (`True` gives a tuple, where `False` gives just the message text). * `category_filter` filters the messages down to only those matching the provided categories. See :ref:`message-flashing-pattern` for examples. .. versionchanged:: 0.3 `with_categories` parameter added. .. versionchanged:: 0.9 `category_filter` parameter added. :param with_categories: set to `True` to also receive categories. :param category_filter: whitelist of categories to limit return values RV c s | d � k S( Ni ( ( t f( t category_filter( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt <lambda>� s i N( R R! R\ R R R: t listt filter( t with_categoriesR_ R\ t x( ( R_ s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt get_flashed_messagess s .!c C s} d } t | t � r$ | } d } n} d d l m } | } t | d d � } | r� | r� t | t � r� | t d � d d �n | r� | t d � d d �n | d k r� t j j | � s� t j j t j | � } q� n | d k r| s� | rt j | p| � d } n | d k r&d } n t � } | r�| d k rq| d k r\t d � � n t j j | � } n | j d d d | �n t j r�| r�| d k r�| j � n | | d <t j j | � | d <d } nX | d k r!t | d � } t j j | � } t j j | � | d <n t t j | � } t j | d | d | d t �} | d k rrt | � | _ n t | j _ | d k r�t j! | � } n | d k r�| | j _" t t# � | � | _$ n | ry| d k ry| j% d t j j | � t j j | � t& t | t' � r'| j( d � n | � d @f � | ry| j) t � } | j* d k rv| j+ j, d d � qvqyn | S( s] Sends the contents of a file to the client. This will use the most efficient method available and configured. By default it will try to use the WSGI server's file_wrapper support. Alternatively you can set the application's :attr:`~Flask.use_x_sendfile` attribute to ``True`` to directly emit an `X-Sendfile` header. This however requires support of the underlying webserver for `X-Sendfile`. By default it will try to guess the mimetype for you, but you can also explicitly provide one. For extra security you probably want to send certain files as attachment (HTML for instance). The mimetype guessing requires a `filename` or an `attachment_filename` to be provided. Please never pass filenames to this function from user sources without checking them first. Something like this is usually sufficient to avoid security problems:: if '..' in filename or filename.startswith('/'): abort(404) .. versionadded:: 0.2 .. versionadded:: 0.5 The `add_etags`, `cache_timeout` and `conditional` parameters were added. The default behavior is now to attach etags. .. versionchanged:: 0.7 mimetype guessing and etag support for file objects was deprecated because it was unreliable. Pass a filename if you are able to, otherwise attach an etag yourself. This functionality will be removed in Flask 1.0 .. versionchanged:: 0.9 cache_timeout pulls its default from application config, when None. :param filename_or_fp: the filename of the file to send. This is relative to the :attr:`~Flask.root_path` if a relative path is specified. Alternatively a file object might be provided in which case `X-Sendfile` might not work and fall back to the traditional method. Make sure that the file pointer is positioned at the start of data to send before calling :func:`send_file`. :param mimetype: the mimetype of the file if provided, otherwise auto detection happens. :param as_attachment: set to `True` if you want to send this file with a ``Content-Disposition: attachment`` header. :param attachment_filename: the filename for the attachment if it differs from the file's filename. :param add_etags: set to `False` to disable attaching of etags. :param conditional: set to `True` to enable conditional responses. :param cache_timeout: the timeout in seconds for the headers. When `None` (default), this value is set by :meth:`~Flask.get_send_file_max_age` of :data:`~flask.current_app`. i����( t warnt names� The filename support for file objects passed to send_file is now deprecated. Pass an attach_filename if you want mimetypes to be guessed.t stackleveli s� In future flask releases etags will no longer be generated for file objects passed to the send_file function because this behavior was unreliable. Pass filenames instead if possible, otherwise attach an etag yourself based on another valuei s application/octet-streams8 filename unavailable, required for sending as attachments Content-Dispositiont attachmentt filenames X-Sendfiles Content-Lengtht rbt mimetypet headerst direct_passthroughs flask-%s-%s-%ss utf-8I���� i0 s x-sendfileN(- R t isinstanceR t warningsRf RN t DeprecationWarningt ost patht isabst joinR t root_patht mimetypest guess_typeR R( t basenamet addt use_x_sendfileR t getsizet opent getmtimeR R t environR+ R< t intt last_modifiedt cache_controlt publict get_send_file_max_aget max_ageR t expirest set_etagR R t encodet make_conditionalt status_codeRm R: ( t filename_or_fpRl t as_attachmentt attachment_filenamet add_etagst cache_timeoutt conditionalt mtimeRj t fileRf Rm t dataRK ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt send_file� s~ < c C s� t j | � } x& t D] } | | k r t � � q q Wt j j | � se | d k se | j d � rq t � � n t j j | | � S( s6 Safely join `directory` and `filename`. Example usage:: @app.route('/wiki/<path:filename>') def wiki_page(filename): filename = safe_join(app.config['WIKI_FOLDER'], filename) with open(filename, 'rb') as fd: content = fd.read() # Read and process the file content... :param directory: the base directory. :param filename: the untrusted filename relative to that directory. :raises: :class:`~werkzeug.exceptions.NotFound` if the resulting path would fall out of `directory`. s ..s ../( t posixpatht normpatht _os_alt_sepsR Rr Rs Rt R9 Ru ( t directoryRj R ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt safe_join. s c K sJ t | | � } t j j | � s- t � � n | j d t � t | | � S( s Send a file from a given directory with :func:`send_file`. This is a secure way to quickly expose static files from an upload folder or something similar. Example usage:: @app.route('/uploads/<path:filename>') def download_file(filename): return send_from_directory(app.config['UPLOAD_FOLDER'], filename, as_attachment=True) .. admonition:: Sending files and Performance It is strongly recommended to activate either `X-Sendfile` support in your webserver or (if no authentication happens) to tell the webserver to serve files for the given path on its own without calling into the web application for improved performance. .. versionadded:: 0.5 :param directory: the directory where all the files are stored. :param filename: the filename relative to that directory to download. :param options: optional keyword arguments that are directly forwarded to :func:`send_file`. R� ( R� Rr Rs t isfileR t setdefaultR< R� ( R� Rj t options( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt send_from_directoryI s c C s� t j j | � } | d k rL t | d � rL t j j t j j | j � � St j | � } | d k ss | d k r} t j � St | d � r� | j | � } n t | � t j | j } t j j t j j | � � S( s� Returns the path to a package or cwd if that cannot be found. This returns the path of a package or the folder that contains a module. Not to be confused with the package path returned by :func:`find_package`. t __file__t __main__t get_filenameN( t syst modulesRX R R# Rr Rs t dirnamet abspathR� t pkgutilt get_loadert getcwdR� t __import__( t import_namet modt loadert filepath( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt get_root_pathk s c C s� | j d � d } t j | � } | d k s: | d k rI t j � } n� t | d � rj | j | � } n5 t | d � r� | j } n t | � t j | j } t j j t j j | � � } | j | � r� t j j | � } n t j j | � \ } } t j j t j � } | j | � r'| | f S| j � d k r�t j j | � \ } } | j � d k rl| } n9 t j j | � j � d k r�t j j | � } n | } | | f Sd | f S( s� Finds a package and returns the prefix (or None if the package is not installed) as well as the folder that contains the package or module as a tuple. The package path returned is the module that would have to be added to the pythonpath in order to make it possible to import the module. The prefix is the path below which a UNIX like folder structure exists (lib, share etc.). R. i R� R� t archives site-packagest libN( t splitR� R� R Rr R� R# R� R� R� R� R� R� Rs R� R� t is_packaget prefixR9 t lowerRy ( R� t root_mod_nameR� t package_pathRj t site_parentt site_foldert py_prefixt parentt foldert base_dir( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt find_package� s4 t locked_cached_propertyc B s) e Z d Z d d d � Z d d � Z RS( s# A decorator that converts a function into a lazy property. The function wrapped is called the first time to retrieve the result and then that calculated result is used the next time you access the value. Works like the one in Werkzeug but has a lock for thread safety. c C sI | p | j | _ | j | _ | p* | j | _ | | _ t � | _ d S( N( R t __module__t __doc__t funcR t lock( t selfR� Rg t doc( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt __init__� s c C sn | d k r | S| j �O | j j | j t � } | t k r` | j | � } | | j | j <n | SWd QXd S( N( R R� t __dict__RX R t _missingR� ( R� t objt typet value( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt __get__� s N( R R� R� R R� R� ( ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyR� � s t _PackageBoundObjectc B s� e Z d d � Z d � Z d � Z e e e � Z [ [ d � Z d � Z e e e � Z [ [ e d � � Z e d � � Z d � Z d � Z d d � Z RS( c C s: | | _ | | _ t | j � | _ d | _ d | _ d S( N( R� t template_folderR� Rv R t _static_foldert _static_url_path( R� R� R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyR� � s c C s, | j d k r( t j j | j | j � Sd S( N( R� R Rr Rs Ru Rv ( R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt _get_static_folder� s c C s | | _ d S( N( R� ( R� R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt _set_static_folder� s c C s@ | j d k r9 | j d k r" d Sd t j j | j � S| j S( NR ( R� R t static_folderRr Rs Ry ( R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt _get_static_url_path� s c C s | | _ d S( N( R� ( R� R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt _set_static_url_path� s c C s | j d k S( s� This is `True` if the package bound object's container has a folder named ``'static'``. .. versionadded:: 0.5 N( R� R ( R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt has_static_folder� s c C s2 | j d k r. t t j j | j | j � � Sd S( sW The Jinja loader for this package bound object. .. versionadded:: 0.5 N( R� R R Rr Rs Ru Rv ( R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt jinja_loader s c C s t j d S( s� Provides default cache_timeout for the :func:`send_file` functions. By default, this function returns ``SEND_FILE_MAX_AGE_DEFAULT`` from the configuration of :data:`~flask.current_app`. Static file functions such as :func:`send_from_directory` use this function, and :func:`send_file` calls this function on :data:`~flask.current_app` when the given cache_timeout is `None`. If a cache_timeout is given in :func:`send_file`, that timeout is used; otherwise, this method is called. This allows subclasses to change the behavior when sending files based on the filename. For example, to set the cache timeout for .js files to 60 seconds:: class MyFlask(flask.Flask): def get_send_file_max_age(self, name): if name.lower().endswith('.js'): return 60 return flask.Flask.get_send_file_max_age(self, name) .. versionadded:: 0.9 t SEND_FILE_MAX_AGE_DEFAULT( R t config( R� Rj ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyR� s c C s= | j s t d � � n | j | � } t | j | d | �S( s� Function used internally to send static files from the static folder to the browser. .. versionadded:: 0.5 s No static folder for this objectR� ( R� R" R� R� R� ( R� Rj R� ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt send_static_file* s Rk c C s: | d k r t d � � n t t j j | j | � | � S( s� Opens a resource from the application's resource folder. To see how this works, consider the following folder structure:: /myapplication.py /schema.sql /static /style.css /templates /layout.html /index.html If you want to open the `schema.sql` file you would do the following:: with app.open_resource('schema.sql') as f: contents = f.read() do_something_with(contents) :param resource: the name of the resource. To access resources within subfolders use forward slashes as separator. :param mode: resource file opening mode, default is 'rb'. t rRk s( Resources can only be opened for reading( R� s rb( R? R} Rr Rs Ru Rv ( R� t resourcet mode( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt open_resource8 s N( R R� R R� R� R� t propertyR� R� R� t static_url_pathR� R� R� R� R� R� ( ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyR� � s (@ R� Rr R� R� R� Rw R t zlibR t threadingR t werkzeug.routingR t functoolsR t werkzeug.urlsR t ImportErrort urlparseR t werkzeug.datastructuresR t werkzeug.exceptionsR t werkzeug.wsgiR t werkzeug.utilst jinja2R t signalsR t globalsR R R R R t _compatR R t objectR� Ra Rs R t altsepR� R R R- RM RT R] R; Re R R< R� R� R� R� R� R� R� ( ( ( s< /opt/imh-python/lib/python2.7/site-packages/flask/helpers.pyt <module> sT ( ( H 1 � '� " ! 3
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