60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
"""
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A utility class which wraps the RateLimitMixin 3rd party class to do bad request counting
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which can be used for rate limiting
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"""
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from __future__ import absolute_import
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from django.conf import settings
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from ratelimitbackend.backends import RateLimitMixin
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class RequestRateLimiter(RateLimitMixin):
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"""
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Use the 3rd party RateLimitMixin to help do rate limiting.
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"""
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def is_rate_limit_exceeded(self, request):
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"""
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Returns if the client has been rated limited
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"""
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counts = self.get_counters(request)
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return sum(counts.values()) >= self.requests
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def tick_request_counter(self, request):
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"""
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Ticks any counters used to compute when rate limt has been reached
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"""
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self.cache_incr(self.get_cache_key(request))
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class BadRequestRateLimiter(RequestRateLimiter):
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"""
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Default rate limit is 30 requests for every 5 minutes.
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"""
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pass
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class PasswordResetEmailRateLimiter(RequestRateLimiter):
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"""
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Rate limiting requests to send password reset emails.
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"""
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email_rate_limit = getattr(settings, 'PASSWORD_RESET_EMAIL_RATE_LIMIT', {})
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requests = email_rate_limit.get('no_of_emails', 1)
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cache_timeout_seconds = email_rate_limit.get('per_seconds', 60)
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reset_email_cache_prefix = 'resetemail'
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def key(self, request, dt):
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"""
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Returns cache key.
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"""
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return '%s-%s-%s' % (
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self.reset_email_cache_prefix,
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self.get_ip(request),
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dt.strftime('%Y%m%d%H%M'),
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)
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def expire_after(self):
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"""
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Returns timeout for cache keys.
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"""
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return self.cache_timeout_seconds
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