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import json

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class JSONMixin:

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    MIMETYPE = 'application/json'

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    CORS_ORIGIN = None

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    CORS_METHODS = None

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    CORS_HEADERS = None

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    CORS_CREDENTIALS = None

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    def headers (self):

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        if self.CORS_ORIGIN:

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            yield 'Access-Control-Allow-Origin', self.CORS_ORIGIN

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        if self.CORS_METHODS:

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            yield 'Access-Control-Allow-Methods', ', '.join(self.CORS_METHODS)

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        if self.CORS_HEADERS:

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            yield 'Access-Control-Allow-Headers', ', '.join(self.CORS_HEADERS)

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        if self.CORS_CREDENTIALS:

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            yield 'Access-Control-Allow-Credentials', 'true'

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    def render_json(self, **parms):

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        raise NotImplementedError()

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    def render_response(self, **params):

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        data = self.render_json(**params)

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        return json.dumps(data)

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