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ProxyPool


			
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  <h1>Source code for flask.wrappers</h1><div class="highlight"><pre>
<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    flask.wrappers</span>
<span class="sd">    ~~~~~~~~~~~~~~</span>

<span class="sd">    Implements the WSGI wrappers (request and response).</span>

<span class="sd">    :copyright: (c) 2015 by Armin Ronacher.</span>
<span class="sd">    :license: BSD, see LICENSE for more details.</span>
<span class="sd">&quot;&quot;&quot;</span>

<span class="kn">from</span> <span class="nn">werkzeug.wrappers</span> <span class="k">import</span> <span class="n">Request</span> <span class="k">as</span> <span class="n">RequestBase</span><span class="p">,</span> <span class="n">Response</span> <span class="k">as</span> <span class="n">ResponseBase</span>
<span class="kn">from</span> <span class="nn">werkzeug.exceptions</span> <span class="k">import</span> <span class="n">BadRequest</span>

<span class="kn">from</span> <span class="nn">.</span> <span class="k">import</span> <span class="n">json</span>
<span class="kn">from</span> <span class="nn">.globals</span> <span class="k">import</span> <span class="n">_request_ctx_stack</span>

<span class="n">_missing</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>


<span class="k">def</span> <span class="nf">_get_data</span><span class="p">(</span><span class="n">req</span><span class="p">,</span> <span class="n">cache</span><span class="p">):</span>
    <span class="n">getter</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">req</span><span class="p">,</span> <span class="s1">&#39;get_data&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">getter</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">getter</span><span class="p">(</span><span class="n">cache</span><span class="o">=</span><span class="n">cache</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">req</span><span class="o">.</span><span class="n">data</span>


<div class="viewcode-block" id="Request"><a class="viewcode-back" href="../../flask/flask.html#flask.app.Request">[docs]</a><span class="k">class</span> <span class="nc">Request</span><span class="p">(</span><span class="n">RequestBase</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;The request object used by default in Flask.  Remembers the</span>
<span class="sd">    matched endpoint and view arguments.</span>

<span class="sd">    It is what ends up as :class:`~flask.request`.  If you want to replace</span>
<span class="sd">    the request object used you can subclass this and set</span>
<span class="sd">    :attr:`~flask.Flask.request_class` to your subclass.</span>

<span class="sd">    The request object is a :class:`~werkzeug.wrappers.Request` subclass and</span>
<span class="sd">    provides all of the attributes Werkzeug defines plus a few Flask</span>
<span class="sd">    specific ones.</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="c1">#: The internal URL rule that matched the request.  This can be</span>
    <span class="c1">#: useful to inspect which methods are allowed for the URL from</span>
    <span class="c1">#: a before/after handler (``request.url_rule.methods``) etc.</span>
    <span class="c1">#:</span>
    <span class="c1">#: .. versionadded:: 0.6</span>
    <span class="n">url_rule</span> <span class="o">=</span> <span class="kc">None</span>

    <span class="c1">#: A dict of view arguments that matched the request.  If an exception</span>
    <span class="c1">#: happened when matching, this will be ``None``.</span>
    <span class="n">view_args</span> <span class="o">=</span> <span class="kc">None</span>

    <span class="c1">#: If matching the URL failed, this is the exception that will be</span>
    <span class="c1">#: raised / was raised as part of the request handling.  This is</span>
    <span class="c1">#: usually a :exc:`~werkzeug.exceptions.NotFound` exception or</span>
    <span class="c1">#: something similar.</span>
    <span class="n">routing_exception</span> <span class="o">=</span> <span class="kc">None</span>

    <span class="c1"># Switched by the request context until 1.0 to opt in deprecated</span>
    <span class="c1"># module functionality.</span>
    <span class="n">_is_old_module</span> <span class="o">=</span> <span class="kc">False</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">max_content_length</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Read-only view of the ``MAX_CONTENT_LENGTH`` config key.&quot;&quot;&quot;</span>
        <span class="n">ctx</span> <span class="o">=</span> <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">top</span>
        <span class="k">if</span> <span class="n">ctx</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">ctx</span><span class="o">.</span><span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="p">[</span><span class="s1">&#39;MAX_CONTENT_LENGTH&#39;</span><span class="p">]</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">endpoint</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;The endpoint that matched the request.  This in combination with</span>
<span class="sd">        :attr:`view_args` can be used to reconstruct the same or a</span>
<span class="sd">        modified URL.  If an exception happened when matching, this will</span>
<span class="sd">        be ``None``.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">url_rule</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
            <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">url_rule</span><span class="o">.</span><span class="n">endpoint</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">module</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;The name of the current module if the request was dispatched</span>
<span class="sd">        to an actual module.  This is deprecated functionality, use blueprints</span>
<span class="sd">        instead.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="kn">from</span> <span class="nn">warnings</span> <span class="k">import</span> <span class="n">warn</span>
        <span class="n">warn</span><span class="p">(</span><span class="ne">DeprecationWarning</span><span class="p">(</span><span class="s1">&#39;modules were deprecated in favor of &#39;</span>
                                <span class="s1">&#39;blueprints.  Use request.blueprint &#39;</span>
                                <span class="s1">&#39;instead.&#39;</span><span class="p">),</span> <span class="n">stacklevel</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_is_old_module</span><span class="p">:</span>
            <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">blueprint</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">blueprint</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;The name of the current blueprint&quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">url_rule</span> <span class="ow">and</span> <span class="s1">&#39;.&#39;</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">url_rule</span><span class="o">.</span><span class="n">endpoint</span><span class="p">:</span>
            <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">url_rule</span><span class="o">.</span><span class="n">endpoint</span><span class="o">.</span><span class="n">rsplit</span><span class="p">(</span><span class="s1">&#39;.&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">json</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;If the mimetype is :mimetype:`application/json` this will contain the</span>
<span class="sd">        parsed JSON data.  Otherwise this will be ``None``.</span>

<span class="sd">        The :meth:`get_json` method should be used instead.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="kn">from</span> <span class="nn">warnings</span> <span class="k">import</span> <span class="n">warn</span>
        <span class="n">warn</span><span class="p">(</span><span class="ne">DeprecationWarning</span><span class="p">(</span><span class="s1">&#39;json is deprecated.  &#39;</span>
                                <span class="s1">&#39;Use get_json() instead.&#39;</span><span class="p">),</span> <span class="n">stacklevel</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_json</span><span class="p">()</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">is_json</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Indicates if this request is JSON or not.  By default a request</span>
<span class="sd">        is considered to include JSON data if the mimetype is</span>
<span class="sd">        :mimetype:`application/json` or :mimetype:`application/*+json`.</span>

<span class="sd">        .. versionadded:: 0.11</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">mt</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">mimetype</span>
        <span class="k">if</span> <span class="n">mt</span> <span class="o">==</span> <span class="s1">&#39;application/json&#39;</span><span class="p">:</span>
            <span class="k">return</span> <span class="kc">True</span>
        <span class="k">if</span> <span class="n">mt</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s1">&#39;application/&#39;</span><span class="p">)</span> <span class="ow">and</span> <span class="n">mt</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">&#39;+json&#39;</span><span class="p">):</span>
            <span class="k">return</span> <span class="kc">True</span>
        <span class="k">return</span> <span class="kc">False</span>

<div class="viewcode-block" id="Request.get_json"><a class="viewcode-back" href="../../flask/flask.html#flask.app.Request.get_json">[docs]</a>    <span class="k">def</span> <span class="nf">get_json</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">force</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">silent</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">cache</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Parses the incoming JSON request data and returns it.  By default</span>
<span class="sd">        this function will return ``None`` if the mimetype is not</span>
<span class="sd">        :mimetype:`application/json` but this can be overridden by the</span>
<span class="sd">        ``force`` parameter. If parsing fails the</span>
<span class="sd">        :meth:`on_json_loading_failed` method on the request object will be</span>
<span class="sd">        invoked.</span>

<span class="sd">        :param force: if set to ``True`` the mimetype is ignored.</span>
<span class="sd">        :param silent: if set to ``True`` this method will fail silently</span>
<span class="sd">                       and return ``None``.</span>
<span class="sd">        :param cache: if set to ``True`` the parsed JSON data is remembered</span>
<span class="sd">                      on the request.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">rv</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">&#39;_cached_json&#39;</span><span class="p">,</span> <span class="n">_missing</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">rv</span> <span class="ow">is</span> <span class="ow">not</span> <span class="n">_missing</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">rv</span>

        <span class="k">if</span> <span class="ow">not</span> <span class="p">(</span><span class="n">force</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_json</span><span class="p">):</span>
            <span class="k">return</span> <span class="kc">None</span>

        <span class="c1"># We accept a request charset against the specification as</span>
        <span class="c1"># certain clients have been using this in the past.  This</span>
        <span class="c1"># fits our general approach of being nice in what we accept</span>
        <span class="c1"># and strict in what we send out.</span>
        <span class="n">request_charset</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">mimetype_params</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;charset&#39;</span><span class="p">)</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">data</span> <span class="o">=</span> <span class="n">_get_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">request_charset</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
                <span class="n">rv</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="n">request_charset</span><span class="p">)</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">rv</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
        <span class="k">except</span> <span class="ne">ValueError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">silent</span><span class="p">:</span>
                <span class="n">rv</span> <span class="o">=</span> <span class="kc">None</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">rv</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">on_json_loading_failed</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">cache</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_cached_json</span> <span class="o">=</span> <span class="n">rv</span>
        <span class="k">return</span> <span class="n">rv</span></div>

<div class="viewcode-block" id="Request.on_json_loading_failed"><a class="viewcode-back" href="../../flask/flask.html#flask.app.Request.on_json_loading_failed">[docs]</a>    <span class="k">def</span> <span class="nf">on_json_loading_failed</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">e</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Called if decoding of the JSON data failed.  The return value of</span>
<span class="sd">        this method is used by :meth:`get_json` when an error occurred.  The</span>
<span class="sd">        default implementation just raises a :class:`BadRequest` exception.</span>

<span class="sd">        .. versionchanged:: 0.10</span>
<span class="sd">           Removed buggy previous behavior of generating a random JSON</span>
<span class="sd">           response.  If you want that behavior back you can trivially</span>
<span class="sd">           add it by subclassing.</span>

<span class="sd">        .. versionadded:: 0.8</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">ctx</span> <span class="o">=</span> <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">top</span>
        <span class="k">if</span> <span class="n">ctx</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">ctx</span><span class="o">.</span><span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;DEBUG&#39;</span><span class="p">,</span> <span class="kc">False</span><span class="p">):</span>
            <span class="k">raise</span> <span class="n">BadRequest</span><span class="p">(</span><span class="s1">&#39;Failed to decode JSON object: </span><span class="si">{0}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
        <span class="k">raise</span> <span class="n">BadRequest</span><span class="p">()</span></div>

    <span class="k">def</span> <span class="nf">_load_form_data</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="n">RequestBase</span><span class="o">.</span><span class="n">_load_form_data</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>

        <span class="c1"># In debug mode we&#39;re replacing the files multidict with an ad-hoc</span>
        <span class="c1"># subclass that raises a different error for key errors.</span>
        <span class="n">ctx</span> <span class="o">=</span> <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">top</span>
        <span class="k">if</span> <span class="n">ctx</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">ctx</span><span class="o">.</span><span class="n">app</span><span class="o">.</span><span class="n">debug</span> <span class="ow">and</span> \
           <span class="bp">self</span><span class="o">.</span><span class="n">mimetype</span> <span class="o">!=</span> <span class="s1">&#39;multipart/form-data&#39;</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">files</span><span class="p">:</span>
            <span class="kn">from</span> <span class="nn">.debughelpers</span> <span class="k">import</span> <span class="n">attach_enctype_error_multidict</span>
            <span class="n">attach_enctype_error_multidict</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span></div>


<div class="viewcode-block" id="Response"><a class="viewcode-back" href="../../flask/flask.html#flask.app.Response">[docs]</a><span class="k">class</span> <span class="nc">Response</span><span class="p">(</span><span class="n">ResponseBase</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;The response object that is used by default in Flask.  Works like the</span>
<span class="sd">    response object from Werkzeug but is set to have an HTML mimetype by</span>
<span class="sd">    default.  Quite often you don&#39;t have to create this object yourself because</span>
<span class="sd">    :meth:`~flask.Flask.make_response` will take care of that for you.</span>

<span class="sd">    If you want to replace the response object used you can subclass this and</span>
<span class="sd">    set :attr:`~flask.Flask.response_class` to your subclass.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">default_mimetype</span> <span class="o">=</span> <span class="s1">&#39;text/html&#39;</span></div>
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