telegram_bots/bots/modules/overlay.py

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import os
from tempfile import TemporaryDirectory
from time import sleep
from PIL import Image
from django.db import models
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from django import forms
from django.forms import modelformset_factory
from telegram import Update
from telegram.ext import Dispatcher, CallbackContext, MessageHandler, Filters, CommandHandler
from bots.models import TelegramBotModuleConfig
class OverlayBotModuleConfig(TelegramBotModuleConfig):
start_text = models.TextField(null=True, blank=True)
type_error_text = models.TextField(null=True, blank=True)
comment = models.TextField(blank=True, null=True)
MODULE_NAME = 'Overlay'
def start_handler(self, update: Update, ctx: CallbackContext):
if self.start_text:
update.effective_message.reply_text(self.start_text)
def message_handler(self, update: Update, ctx: CallbackContext):
if self.type_error_text:
update.effective_message.reply_text(self.type_error_text)
def photo_handler(self, update: Update, ctx: CallbackContext):
with TemporaryDirectory() as d:
src = os.path.join(d, 'src.jpg')
out = os.path.join(d, 'out.png')
q = update.effective_message.photo[-1].get_file().download(src)
im = Image.open(q).convert('RGBA') # type: Image.Image
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overlay = Image.open(self.images.order_by('?').first().image.path).convert('RGBA') # type: Image.Image
w, h = im.size
min_side = min(w, h)
overlay = overlay.resize((min_side, min_side), Image.LANCZOS)
im.paste(overlay, ((w - min_side) // 2, (h - min_side) // 2), overlay)
im.save(out)
update.effective_message.reply_photo(open(out, 'rb'), caption=self.comment)
def build_dispatcher(self, dispatcher: Dispatcher):
dispatcher.add_handler(CommandHandler('start', self.start_handler))
dispatcher.add_handler(MessageHandler(Filters.photo, self.photo_handler))
dispatcher.add_handler(MessageHandler(Filters.all, self.message_handler))
return dispatcher
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@staticmethod
def form_context_data(view, instance=None):
ImageFormSet = modelformset_factory(OverlayImage, form=ImageForm, extra=3, can_delete=True)
formset = ImageFormSet(queryset=instance.images.all() if instance else OverlayImage.objects.none())
return {
'formset': formset,
}
@staticmethod
def form_valid(view, bots_form, config_form):
ImageFormSet = modelformset_factory(OverlayImage, form=ImageForm, extra=3, can_delete=True)
formset = ImageFormSet(view.request.POST, view.request.FILES, queryset=config_form.instance.images.all())
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for form in formset.cleaned_data:
if form:
if form['DELETE']:
form['id'].delete()
elif form['image']:
if form['id']:
instance = form['id']
instance.image = form['image']
instance.save()
else:
OverlayImage.objects.create(config=config_form.instance, image=form['image'])
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class OverlayImage(models.Model):
config = models.ForeignKey(OverlayBotModuleConfig, on_delete=models.CASCADE, related_name='images')
image = models.ImageField()
class ImageForm(forms.ModelForm):
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image = forms.ImageField(widget=forms.ClearableFileInput(attrs={'accept': 'image/png'}), required=False)
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class Meta:
model = OverlayImage
fields = 'image',