views.py 9.75 KB
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from go.models import URL, RegisteredUser
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from go.forms import URLForm, SignupForm
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from datetime import timedelta
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from django.conf import settings
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from django.http import Http404, HttpResponseServerError
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from django.utils import timezone
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from django.contrib.auth.models import User
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from django.core.exceptions import PermissionDenied, ValidationError
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from django.core.mail import send_mail
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from django.contrib.auth import REDIRECT_FIELD_NAME
from django.contrib.auth.decorators import user_passes_test, login_required
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from django.shortcuts import render, get_object_or_404, redirect
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import os
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##############################################################################
"""
Define useful helper methods here.
"""


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def is_approved( user ):
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    """
    This function checks if a user account has a corresponding RegisteredUser,
    thus checking if the user is registered.
    """

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    try:
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        registered = RegisteredUser.objects.get( username=user.username )
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        return registered.approved
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    except RegisteredUser.DoesNotExist:
        return False

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def is_registered(user):
    """
    This function checks if a user account has a corresponding RegisteredUser,
    thus checking if the user is registered.
    """

    try:
        registered = RegisteredUser.objects.get( username=user.username )
        return True
    except RegisteredUser.DoesNotExist:
        return False


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##############################################################################
"""
Define error page handling here.
"""


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def error_404(request):
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    """
    Error 404 view, in case a url is not found.
    """

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    return render(request, '404.html', {
    },
    )

def error_500(request):
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    """
    Error 500 view, in case a server error occurs.
    """

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    return render(request, '500.html', {
    },
    )

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##############################################################################
"""
Define user views here.
"""


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@login_required
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def index(request):
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    """
    This view handles the homepage that the user is presented with when
    they request '/'. If they're not logged in, they're redirected to
    login. If they're logged in but not registered, they're given the
    not_registered error page. If they are logged in AND registered, they
    get the URL registration form.
    """
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    # If the user isn't registered, don't give them any leeway.
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    if not is_approved(request.user):
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        return render(request, 'not_registered.html')

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    url_form = URLForm() # unbound form

    if request.method == 'POST':
        url_form = URLForm( request.POST ) # bind dat form
        if url_form.is_valid():

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            # We don't commit the url object yet because we need to add its
            # owner, and parse its date field.
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            url = url_form.save(commit=False)
            url.owner = request.user

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            # If the user entered a short url, it's already been validated,
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            # so accept it. If they did not, however, then generate a
            # random one and use that instead.
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            short = url_form.cleaned_data.get('short').strip()
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            if len(short) > 0:
                url.short = short
            else:
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                # If the user didn't enter a short url, generate a random
                # one. However, if a random one can't be generated, return
                # a 500 server error.
                random_short = URL.generate_valid_short()
                if random_short is None:
                    return HttpResponseServerError(
                        render(request, '500.html', {})
                    )
                else:
                    url.short = random_short
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            # Grab the expiration field value. It's currently an unsable
            # string value, so we need to parse it into a datetime object
            # relative to right now.
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            expires = url_form.cleaned_data.get('expires')
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            if expires == URLForm.DAY:
                url.expires = timezone.now() + timedelta(days=1)
            elif expires == URLForm.WEEK:
                url.expires = timezone.now() + timedelta(weeks=1)
            elif expires == URLForm.MONTH:
                url.expires = timezone.now() + timedelta(weeks=3)
            else:
                pass # leave the field NULL

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            # Make sure that our new URL object is clean, then save it and
            # let's redirect to view this baby.
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            url.full_clean()
            url.save()
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            return redirect('view', url.short)
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    return render(request, 'index.html', {
        'form': url_form,
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    },
    )

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def view(request, short):
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    """
    This view allows the user to view details about a URL. Note that they
    do not need to be logged in to view info.
    """

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    url = get_object_or_404(URL, short__iexact = short)
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    return render(request, 'view.html', {
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        'url': url,
    },
    )

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@login_required
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def my_links(request):
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    """
    This view displays all the information about all of your URLs. You
    obviously need to be logged in to view your URLs.
    """

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    if not is_approved(request.user):
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        return render(request, 'not_registered.html')
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    urls = URL.objects.filter( owner = request.user )
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    return render(request, 'my_links.html', {
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        'urls' : urls,
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    },
    )

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@login_required
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def delete(request, short):
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    """
    This view deletes a URL if you have the permission to. User must be
    logged in and registered, and must also be the owner of the URL.
    """

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    if not is_approved(request.user):
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        return render(request, 'not_registered.html')
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    url = get_object_or_404(URL, short__iexact = short )
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    if url.owner == request.user:
        url.delete()
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        return redirect('my_links')
    else:
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        raise PermissionDenied()
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@login_required
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def signup(request):
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    """
    This view presents the user with a registration form. You can register
    yourself, or another person.

    """
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    if is_registered(request.user) and not request.user.is_staff:
        return render(request, 'signup.html', {
            'registered': True,
        },
        )

    signup_form = SignupForm(initial={'username': request.user.username})
    # Non-staff have the username field read-only and pre-filled
    if request.user.is_staff:
        signup_form = SignupForm()
    else:
        signup_form = SignupForm(initial={'username': request.user.username})
        signup_form.fields['username'].widget.attrs['readonly'] = 'readonly'
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    if request.method == 'POST':
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        signup_form = SignupForm(request.POST, initial={'approved': False,
            'username': request.user.username})

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        if signup_form.is_valid():
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            # Prevent hax: if not staff, force the username back to the request username.
            if not request.user.is_staff:
                username = request.user.username
            else:
                username = signup_form.cleaned_data.get('username')
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            full_name = signup_form.cleaned_data.get('full_name')
            description = signup_form.cleaned_data.get('description')
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            send_mail('Signup from %s' % (username), '%s signed up at %s\n'
                'Username: %s\nMessage: %s\nPlease attend to this request at '
                'your earliest convenience.' % (str(full_name),
                str(timezone.now()).strip(), str(username), str(description)),
                settings.EMAIL_FROM, [settings.EMAIL_TO])

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            signup_form.save()

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            return redirect('registered')
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    return render(request, 'signup.html', {
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        'form': signup_form,
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        'registered': False,
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    },
    )
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def redirection(request, short):
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    """
    This view redirects a user based on the short URL they requested.
    """
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    url = get_object_or_404( URL, short__iexact = short )
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    url.clicks = url.clicks + 1
    url.save()
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    """
    Include server-side tracking because there is no template displayed to
    the user which would include javascript tracking.
    """

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    from piwikapi.tracking import PiwikTracker
    from django.conf import settings
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    # First, if PIWIK variables are undefined, don't try to push
    if settings.PIWIK_SITE_ID is not "" and settings.PIWIK_URL is not "":
        try:
            piwiktracker = PiwikTracker(settings.PIWIK_SITE_ID, request)
            piwiktracker.set_api_url(settings.PIWIK_URL)
            piwiktracker.do_track_page_view('Redirect to %s' % url.target)
        # Second, if we do get an error, don't let that keep us from redirecting
        except:
            pass
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    return redirect( url.target )
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def staff_member_required(view_func, redirect_field_name=REDIRECT_FIELD_NAME, login_url='about'):
    """
    Decorator for views that checks that the user is logged in and is a staff
    member, displaying the login page if necessary.
    """
    return user_passes_test(
        lambda u: u.is_active and u.is_staff,
        login_url=login_url,
        redirect_field_name=redirect_field_name
    )(view_func)


@staff_member_required
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def useradmin(request):
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    """
    This view is a simplified admin panel, so that staff don't need to log in
    to approve links
    """
    if request.POST:
        if '_approve' in request.POST:
            toapprove = RegisteredUser.objects.get(username=request.POST['username'])
            toapprove.approved = True
            toapprove.save()
        elif '_deny' in request.POST:
            todeny = RegisteredUser.objects.get(username=request.POST['username'])
            todeny.delete()
    need_approval = RegisteredUser.objects.filter(approved=False)
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    return render(request, 'useradmin.html',{
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        'need_approval': need_approval
    },
    )


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##############################################################################
"""
Define static user views here.
"""


def about(request):
    return render(request, 'about.html', {
    },
    )

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def registered(request):
    return render(request, 'registered.html', {
    },
    )