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<h1>Coverage for <b>rest_framework/negotiation</b> :
<span class='pc_cov'>90%</span>
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41 statements
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<p id='t1' class='pln'><span class='str'>"""</span><span class='strut'> </span></p>
<p id='t2' class='pln'><span class='str'>Content negotiation deals with selecting an appropriate renderer given the</span><span class='strut'> </span></p>
<p id='t3' class='pln'><span class='str'>incoming request. Typically this will be based on the request's Accept header.</span><span class='strut'> </span></p>
<p id='t4' class='pln'><span class='str'>"""</span><span class='strut'> </span></p>
<p id='t5' class='stm run hide_run'><span class='key'>from</span> <span class='nam'>__future__</span> <span class='key'>import</span> <span class='nam'>unicode_literals</span><span class='strut'> </span></p>
<p id='t6' class='stm run hide_run'><span class='key'>from</span> <span class='nam'>django</span><span class='op'>.</span><span class='nam'>http</span> <span class='key'>import</span> <span class='nam'>Http404</span><span class='strut'> </span></p>
<p id='t7' class='stm run hide_run'><span class='key'>from</span> <span class='nam'>rest_framework</span> <span class='key'>import</span> <span class='nam'>exceptions</span><span class='strut'> </span></p>
<p id='t8' class='stm run hide_run'><span class='key'>from</span> <span class='nam'>rest_framework</span><span class='op'>.</span><span class='nam'>settings</span> <span class='key'>import</span> <span class='nam'>api_settings</span><span class='strut'> </span></p>
<p id='t9' class='stm run hide_run'><span class='key'>from</span> <span class='nam'>rest_framework</span><span class='op'>.</span><span class='nam'>utils</span><span class='op'>.</span><span class='nam'>mediatypes</span> <span class='key'>import</span> <span class='nam'>order_by_precedence</span><span class='op'>,</span> <span class='nam'>media_type_matches</span><span class='strut'> </span></p>
<p id='t10' class='stm run hide_run'><span class='key'>from</span> <span class='nam'>rest_framework</span><span class='op'>.</span><span class='nam'>utils</span><span class='op'>.</span><span class='nam'>mediatypes</span> <span class='key'>import</span> <span class='nam'>_MediaType</span><span class='strut'> </span></p>
<p id='t11' class='pln'><span class='strut'> </span></p>
<p id='t12' class='pln'><span class='strut'> </span></p>
<p id='t13' class='stm run hide_run'><span class='key'>class</span> <span class='nam'>BaseContentNegotiation</span><span class='op'>(</span><span class='nam'>object</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t14' class='stm run hide_run'> <span class='key'>def</span> <span class='nam'>select_parser</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>,</span> <span class='nam'>request</span><span class='op'>,</span> <span class='nam'>parsers</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t15' class='stm mis'> <span class='key'>raise</span> <span class='nam'>NotImplementedError</span><span class='op'>(</span><span class='str'>'.select_parser() must be implemented'</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t16' class='pln'><span class='strut'> </span></p>
<p id='t17' class='stm run hide_run'> <span class='key'>def</span> <span class='nam'>select_renderer</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>,</span> <span class='nam'>request</span><span class='op'>,</span> <span class='nam'>renderers</span><span class='op'>,</span> <span class='nam'>format_suffix</span><span class='op'>=</span><span class='nam'>None</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t18' class='stm mis'> <span class='key'>raise</span> <span class='nam'>NotImplementedError</span><span class='op'>(</span><span class='str'>'.select_renderer() must be implemented'</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t19' class='pln'><span class='strut'> </span></p>
<p id='t20' class='pln'><span class='strut'> </span></p>
<p id='t21' class='stm run hide_run'><span class='key'>class</span> <span class='nam'>DefaultContentNegotiation</span><span class='op'>(</span><span class='nam'>BaseContentNegotiation</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t22' class='stm run hide_run'> <span class='nam'>settings</span> <span class='op'>=</span> <span class='nam'>api_settings</span><span class='strut'> </span></p>
<p id='t23' class='pln'><span class='strut'> </span></p>
<p id='t24' class='stm run hide_run'> <span class='key'>def</span> <span class='nam'>select_parser</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>,</span> <span class='nam'>request</span><span class='op'>,</span> <span class='nam'>parsers</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t25' class='pln'> <span class='str'>"""</span><span class='strut'> </span></p>
<p id='t26' class='pln'><span class='str'> Given a list of parsers and a media type, return the appropriate</span><span class='strut'> </span></p>
<p id='t27' class='pln'><span class='str'> parser to handle the incoming request.</span><span class='strut'> </span></p>
<p id='t28' class='pln'><span class='str'> """</span><span class='strut'> </span></p>
<p id='t29' class='stm run hide_run'> <span class='key'>for</span> <span class='nam'>parser</span> <span class='key'>in</span> <span class='nam'>parsers</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t30' class='stm run hide_run'> <span class='key'>if</span> <span class='nam'>media_type_matches</span><span class='op'>(</span><span class='nam'>parser</span><span class='op'>.</span><span class='nam'>media_type</span><span class='op'>,</span> <span class='nam'>request</span><span class='op'>.</span><span class='nam'>content_type</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t31' class='stm run hide_run'> <span class='key'>return</span> <span class='nam'>parser</span><span class='strut'> </span></p>
<p id='t32' class='stm mis'> <span class='key'>return</span> <span class='nam'>None</span><span class='strut'> </span></p>
<p id='t33' class='pln'><span class='strut'> </span></p>
<p id='t34' class='stm run hide_run'> <span class='key'>def</span> <span class='nam'>select_renderer</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>,</span> <span class='nam'>request</span><span class='op'>,</span> <span class='nam'>renderers</span><span class='op'>,</span> <span class='nam'>format_suffix</span><span class='op'>=</span><span class='nam'>None</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t35' class='pln'> <span class='str'>"""</span><span class='strut'> </span></p>
<p id='t36' class='pln'><span class='str'> Given a request and a list of renderers, return a two-tuple of:</span><span class='strut'> </span></p>
<p id='t37' class='pln'><span class='str'> (renderer, media type).</span><span class='strut'> </span></p>
<p id='t38' class='pln'><span class='str'> """</span><span class='strut'> </span></p>
<p id='t39' class='pln'> <span class='com'># Allow URL style format override. eg. "?format=json</span><span class='strut'> </span></p>
<p id='t40' class='stm run hide_run'> <span class='nam'>format_query_param</span> <span class='op'>=</span> <span class='nam'>self</span><span class='op'>.</span><span class='nam'>settings</span><span class='op'>.</span><span class='nam'>URL_FORMAT_OVERRIDE</span><span class='strut'> </span></p>
<p id='t41' class='stm run hide_run'> <span class='nam'>format</span> <span class='op'>=</span> <span class='nam'>format_suffix</span> <span class='key'>or</span> <span class='nam'>request</span><span class='op'>.</span><span class='nam'>QUERY_PARAMS</span><span class='op'>.</span><span class='nam'>get</span><span class='op'>(</span><span class='nam'>format_query_param</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t42' class='pln'><span class='strut'> </span></p>
<p id='t43' class='stm run hide_run'> <span class='key'>if</span> <span class='nam'>format</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t44' class='stm run hide_run'> <span class='nam'>renderers</span> <span class='op'>=</span> <span class='nam'>self</span><span class='op'>.</span><span class='nam'>filter_renderers</span><span class='op'>(</span><span class='nam'>renderers</span><span class='op'>,</span> <span class='nam'>format</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t45' class='pln'><span class='strut'> </span></p>
<p id='t46' class='stm run hide_run'> <span class='nam'>accepts</span> <span class='op'>=</span> <span class='nam'>self</span><span class='op'>.</span><span class='nam'>get_accept_list</span><span class='op'>(</span><span class='nam'>request</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t47' class='pln'><span class='strut'> </span></p>
<p id='t48' class='pln'> <span class='com'># Check the acceptable media types against each renderer,</span><span class='strut'> </span></p>
<p id='t49' class='pln'> <span class='com'># attempting more specific media types first</span><span class='strut'> </span></p>
<p id='t50' class='pln'> <span class='com'># NB. The inner loop here isn't as bad as it first looks :)</span><span class='strut'> </span></p>
<p id='t51' class='pln'> <span class='com'># Worst case is we're looping over len(accept_list) * len(self.renderers)</span><span class='strut'> </span></p>
<p id='t52' class='stm run hide_run'> <span class='key'>for</span> <span class='nam'>media_type_set</span> <span class='key'>in</span> <span class='nam'>order_by_precedence</span><span class='op'>(</span><span class='nam'>accepts</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t53' class='stm run hide_run'> <span class='key'>for</span> <span class='nam'>renderer</span> <span class='key'>in</span> <span class='nam'>renderers</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t54' class='stm run hide_run'> <span class='key'>for</span> <span class='nam'>media_type</span> <span class='key'>in</span> <span class='nam'>media_type_set</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t55' class='stm run hide_run'> <span class='key'>if</span> <span class='nam'>media_type_matches</span><span class='op'>(</span><span class='nam'>renderer</span><span class='op'>.</span><span class='nam'>media_type</span><span class='op'>,</span> <span class='nam'>media_type</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t56' class='pln'> <span class='com'># Return the most specific media type as accepted.</span><span class='strut'> </span></p>
<p id='t57' class='stm run hide_run'> <span class='key'>if</span> <span class='op'>(</span><span class='nam'>_MediaType</span><span class='op'>(</span><span class='nam'>renderer</span><span class='op'>.</span><span class='nam'>media_type</span><span class='op'>)</span><span class='op'>.</span><span class='nam'>precedence</span> <span class='op'>></span><span class='strut'> </span></p>
<p id='t58' class='pln'> <span class='nam'>_MediaType</span><span class='op'>(</span><span class='nam'>media_type</span><span class='op'>)</span><span class='op'>.</span><span class='nam'>precedence</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t59' class='pln'> <span class='com'># Eg client requests '*/*'</span><span class='strut'> </span></p>
<p id='t60' class='pln'> <span class='com'># Accepted media type is 'application/json'</span><span class='strut'> </span></p>
<p id='t61' class='stm run hide_run'> <span class='key'>return</span> <span class='nam'>renderer</span><span class='op'>,</span> <span class='nam'>renderer</span><span class='op'>.</span><span class='nam'>media_type</span><span class='strut'> </span></p>
<p id='t62' class='pln'> <span class='key'>else</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t63' class='pln'> <span class='com'># Eg client requests 'application/json; indent=8'</span><span class='strut'> </span></p>
<p id='t64' class='pln'> <span class='com'># Accepted media type is 'application/json; indent=8'</span><span class='strut'> </span></p>
<p id='t65' class='stm run hide_run'> <span class='key'>return</span> <span class='nam'>renderer</span><span class='op'>,</span> <span class='nam'>media_type</span><span class='strut'> </span></p>
<p id='t66' class='pln'><span class='strut'> </span></p>
<p id='t67' class='stm run hide_run'> <span class='key'>raise</span> <span class='nam'>exceptions</span><span class='op'>.</span><span class='nam'>NotAcceptable</span><span class='op'>(</span><span class='nam'>available_renderers</span><span class='op'>=</span><span class='nam'>renderers</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t68' class='pln'><span class='strut'> </span></p>
<p id='t69' class='stm run hide_run'> <span class='key'>def</span> <span class='nam'>filter_renderers</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>,</span> <span class='nam'>renderers</span><span class='op'>,</span> <span class='nam'>format</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t70' class='pln'> <span class='str'>"""</span><span class='strut'> </span></p>
<p id='t71' class='pln'><span class='str'> If there is a '.json' style format suffix, filter the renderers</span><span class='strut'> </span></p>
<p id='t72' class='pln'><span class='str'> so that we only negotiation against those that accept that format.</span><span class='strut'> </span></p>
<p id='t73' class='pln'><span class='str'> """</span><span class='strut'> </span></p>
<p id='t74' class='stm run hide_run'> <span class='nam'>renderers</span> <span class='op'>=</span> <span class='op'>[</span><span class='nam'>renderer</span> <span class='key'>for</span> <span class='nam'>renderer</span> <span class='key'>in</span> <span class='nam'>renderers</span><span class='strut'> </span></p>
<p id='t75' class='pln'> <span class='key'>if</span> <span class='nam'>renderer</span><span class='op'>.</span><span class='nam'>format</span> <span class='op'>==</span> <span class='nam'>format</span><span class='op'>]</span><span class='strut'> </span></p>
<p id='t76' class='stm run hide_run'> <span class='key'>if</span> <span class='key'>not</span> <span class='nam'>renderers</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t77' class='stm mis'> <span class='key'>raise</span> <span class='nam'>Http404</span><span class='strut'> </span></p>
<p id='t78' class='stm run hide_run'> <span class='key'>return</span> <span class='nam'>renderers</span><span class='strut'> </span></p>
<p id='t79' class='pln'><span class='strut'> </span></p>
<p id='t80' class='stm run hide_run'> <span class='key'>def</span> <span class='nam'>get_accept_list</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>,</span> <span class='nam'>request</span><span class='op'>)</span><span class='op'>:</span><span class='strut'> </span></p>
<p id='t81' class='pln'> <span class='str'>"""</span><span class='strut'> </span></p>
<p id='t82' class='pln'><span class='str'> Given the incoming request, return a tokenised list of media</span><span class='strut'> </span></p>
<p id='t83' class='pln'><span class='str'> type strings.</span><span class='strut'> </span></p>
<p id='t84' class='pln'><span class='strut'> </span></p>
<p id='t85' class='pln'><span class='str'> Allows URL style accept override. eg. "?accept=application/json"</span><span class='strut'> </span></p>
<p id='t86' class='pln'><span class='str'> """</span><span class='strut'> </span></p>
<p id='t87' class='stm run hide_run'> <span class='nam'>header</span> <span class='op'>=</span> <span class='nam'>request</span><span class='op'>.</span><span class='nam'>META</span><span class='op'>.</span><span class='nam'>get</span><span class='op'>(</span><span class='str'>'HTTP_ACCEPT'</span><span class='op'>,</span> <span class='str'>'*/*'</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t88' class='stm run hide_run'> <span class='nam'>header</span> <span class='op'>=</span> <span class='nam'>request</span><span class='op'>.</span><span class='nam'>QUERY_PARAMS</span><span class='op'>.</span><span class='nam'>get</span><span class='op'>(</span><span class='nam'>self</span><span class='op'>.</span><span class='nam'>settings</span><span class='op'>.</span><span class='nam'>URL_ACCEPT_OVERRIDE</span><span class='op'>,</span> <span class='nam'>header</span><span class='op'>)</span><span class='strut'> </span></p>
<p id='t89' class='stm run hide_run'> <span class='key'>return</span> <span class='op'>[</span><span class='nam'>token</span><span class='op'>.</span><span class='nam'>strip</span><span class='op'>(</span><span class='op'>)</span> <span class='key'>for</span> <span class='nam'>token</span> <span class='key'>in</span> <span class='nam'>header</span><span class='op'>.</span><span class='nam'>split</span><span class='op'>(</span><span class='str'>','</span><span class='op'>)</span><span class='op'>]</span><span class='strut'> </span></p>
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