import math
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import re
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from rest_framework import status
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from rest_framework.response import Response
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from app.plugins.views import TaskView
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from app.plugins import get_current_plugin, signals as plugin_signals
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from django.dispatch import receiver
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from app.plugins import GlobalDataStore
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from django.http import Http404
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from django.shortcuts import redirect
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from django.utils.translation import ugettext_lazy as _
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import logging
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logger = logging.getLogger('app.logger')
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ds = GlobalDataStore('editshortlinks')
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def gen_short_string(num):
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num = int(abs(num))
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def nbase(num, numerals="abcdefghijklmnopqrstuvwxyz0123456789"):
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return ((num == 0) and numerals[0]) or (nbase(num // len(numerals), numerals).lstrip(numerals[0]) + numerals[num % len(numerals)])
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return nbase(num)
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def getShortLinks(username):
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return ds.get_json(username + "_shortlinks", {
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't': {}, # task --> short id
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'i': {} # short id --> task
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})
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class DeleteShortLink(TaskView):
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def post(self, request, pk=None):
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task = self.get_and_check_task(request, pk)
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task_id = str(task.id)
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username = str(request.user)
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shortlinks = getShortLinks(username)
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short_id = shortlinks['t'].get(task_id)
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if short_id is not None:
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del shortlinks['i'][short_id]
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del shortlinks['t'][task_id]
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ds.set_json(username + "_shortlinks", shortlinks)
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return Response({'success': True}, status=status.HTTP_200_OK)
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class EditShortLink(TaskView):
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def post(self, request, pk=None):
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task = self.get_and_check_task(request, pk)
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task_id = str(task.id)
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username = str(request.user)
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short_id = request.data.get("shortId")
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if not re.match(r'^[A-Za-z0-9_-]+$', short_id):
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return Response({'error': _("Short URLs can only include letters, numbers, underscore and dash characters (A-Z, 0-9, _, -).")})
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shortlinks = getShortLinks(username)
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if shortlinks['i'].get(short_id, task_id) != task_id:
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return Response({'error': _("This short URL is already taken.")})
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# Replace previous if any
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prev_short_id = shortlinks['t'].get(task_id)
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shortlinks['t'][task_id] = short_id
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if prev_short_id is not None:
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del shortlinks['i'][prev_short_id]
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shortlinks['i'][short_id] = task_id
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ds.set_json(username + "_shortlinks", shortlinks)
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return Response({'username': username, 'shortId': short_id}, status=status.HTTP_200_OK)
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class GetShortLink(TaskView):
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def post(self, request, pk=None):
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task = self.get_and_check_task(request, pk)
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task_id = str(task.id)
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username = str(request.user)
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shortlinks = getShortLinks(username)
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if task_id in shortlinks['t']:
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# Return existing short link
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return Response({'username': username, 'shortId': shortlinks['t'][task_id]}, status=status.HTTP_200_OK)
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else:
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# Compute short link, store it
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# Not atomic, but this shouldn't be a big problem
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counter = ds.get_int(username + "_counter", 0)
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ds.set_int(username + "_counter", counter + 1)
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short_id = gen_short_string(counter)
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# Check for conflicts
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while shortlinks['i'].get(short_id) is not None:
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counter += 1
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short_id = gen_short_string(counter)
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# task_id --> short id
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shortlinks['t'][task_id] = short_id
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# short id --> task_id
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shortlinks['i'][short_id] = task_id
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ds.set_json(username + "_shortlinks", shortlinks)
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return Response({'username': username, 'shortId': short_id}, status=status.HTTP_200_OK)
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def HandleShortLink(request, view_type, username, short_id):
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shortlinks = getShortLinks(username)
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if short_id in shortlinks['i']:
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task_id = shortlinks['i'][short_id]
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if view_type == 'm':
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v = 'map'
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elif view_type == '3':
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v = '3d'
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return redirect('/public/task/{}/{}/'.format(task_id, v))
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else:
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raise Http404()
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