src/youtube/models.py

   1 import io
   2 from os import unlink
   3 from tempfile import NamedTemporaryFile
   4 from django.conf import settings
   5 from django.db import models
   6 from django.utils.translation import gettext_lazy as _
   7 from django.template import Template, Context
   8 from apiclient import youtube_call
   9 from .utils import (
  10     concat_audio,
  11     concat_videos,
  12     cut_video,
  13     get_duration,
  14     get_framerate,
  15     mux,
  16     standardize_video,
  17     video_from_image,
  18 )
  19 from .thumbnail import create_thumbnail
  20
  21
  22 class YouTube(models.Model):
  23     title_template = models.CharField(max_length=1024, blank=True)
  24     description_template = models.TextField(blank=True)
  25     category = models.IntegerField(null=True, blank=True, choices=[
  26         (27, 'Edukacja'),
  27     ])
  28     intro_flac = models.FileField(upload_to='youtube/intro_flac', blank=True)
  29     outro_flac = models.FileField(upload_to='youtube/outro_flac', blank=True)
  30     loop_card = models.FileField(upload_to='youtube/card', blank=True)
  31     loop_video = models.FileField(upload_to='youtube/loop_video', blank=True)
  32     thumbnail_template = models.FileField(upload_to='youtube/thumbnail', blank=True)
  33     thumbnail_definition = models.TextField(blank=True)
  34     privacy_status = models.CharField(max_length=16, choices=[
  35         ('public', _('public')),
  36         ('unlisted', _('unlisted')),
  37         ('private', _('private')),
  38     ])
  39     genres = models.CharField(max_length=2048, blank=True)
  40
  41     class Meta:
  42         verbose_name = _("YouTube configuration")
  43         verbose_name_plural = _("YouTube configurations")
  44
  45     def get_context(self, audiobook):
  46         return Context(dict(
  47             audiobook=audiobook,
  48             LICENSE=settings.LICENSE,
  49             LICENSE_NAME=settings.LICENSE_NAME,
  50         ))
  51
  52     def get_description(self, audiobook):
  53         return Template(self.description_template).render(self.get_context(audiobook))
  54
  55     def get_title(self, audiobook):
  56         return Template(self.title_template).render(self.get_context(audiobook))
  57
  58     def get_data(self, audiobook):
  59         return dict(
  60             snippet=dict(
  61                 title=self.get_title(audiobook),
  62                 description=self.get_description(audiobook),
  63                 categoryId=self.category,
  64                 defaultLanguage='pl',
  65                 defaultAudioLanguage='pl',
  66             ),
  67             status=dict(
  68                 privacyStatus=self.privacy_status,
  69             ),
  70         )
  71
  72     def publish(self, audiobook, path):
  73         data = self.get_data(audiobook)
  74         part = ",".join(data.keys())
  75
  76         with open(path, "rb") as f:
  77             response = youtube_call(
  78                 "POST",
  79                 "https://www.googleapis.com/upload/youtube/v3/videos",
  80                 params={'part': part},
  81                 json=data,
  82                 resumable_data=f.read(),
  83             )
  84         data = response.json()
  85         audiobook.youtube_id = data['id']
  86         audiobook.save(update_fields=['youtube_id'])
  87
  88         self.update_thumbnail(audiobook)
  89         return response
  90
  91     def update_data(self, audiobook):
  92         data = self.get_data(audiobook)
  93         data['id'] = audiobook.youtube_id
  94         part = ",".join(data.keys())
  95         youtube_call(
  96             "PUT",
  97             "https://www.googleapis.com/youtube/v3/videos",
  98             params={"part": part},
  99             json=data
 100         )
 101
 102     def prepare_file(self, input_path, output_path=None):
 103         audio = self.prepare_audio(input_path)
 104         duration = self.get_duration(input_path)
 105         video = self.prepare_video(duration)
 106         output = mux([video, audio], output_path=output_path)
 107         unlink(audio)
 108         unlink(video)
 109         return output
 110
 111     def get_duration(self, input_path):
 112         d = get_duration(input_path)
 113         if self.intro_flac:
 114             d += get_duration(self.intro_flac.path)
 115         if self.outro_flac:
 116             d += get_duration(self.outro_flac.path)
 117         return d
 118
 119     def prepare_audio(self, input_path):
 120         files = []
 121         if self.intro_flac:
 122             files.append(self.intro_flac.path)
 123         files.append(input_path)
 124         if self.outro_flac:
 125             files.append(self.outro_flac.path)
 126         return concat_audio(files)
 127
 128     def prepare_video(self, duration):
 129         concat = []
 130         outro = []
 131         delete = []
 132
 133         if self.loop_video:
 134             fps = get_framerate(self.loop_video.path)
 135             loop_video = standardize_video(self.loop_video.path)
 136         else:
 137             fps = 25
 138
 139         loop_duration = duration
 140         for card in self.card_set.filter(duration__gt=0):
 141             loop_duration -= card.duration
 142             card_video = video_from_image(
 143                 card.image.path, card.duration, fps=fps
 144             )
 145             (concat if card.order < 0 else outro).append(card_video)
 146             delete.append(card_video)
 147
 148         if self.loop_video:
 149             loop_video_duration = get_duration(loop_video)
 150             times_loop = int(loop_duration // loop_video_duration)
 151
 152             leftover_duration = loop_duration % loop_video_duration
 153             leftover = cut_video(loop_video, leftover_duration)
 154             concat.extend([loop_video] * times_loop + [leftover])
 155             delete.append(leftover)
 156         else:
 157             leftover = video_from_image(self.loop_card.path, loop_duration)
 158             concat.append(video_from_image(self.loop_card.path, loop_duration, fps=fps))
 159             delete.append(leftover)
 160         concat.extend(outro)
 161
 162         output = concat_videos(concat)
 163         for p in delete:
 164             unlink(p)
 165         unlink(loop_video)
 166         return output
 167
 168     # tags
 169     # license
 170     # selfDeclaredMadeForKids
 171
 172     def update_thumbnail(self, audiobook):
 173         thumbnail = self.prepare_thumbnail(audiobook)
 174         response = youtube_call(
 175             "POST",
 176             "https://www.googleapis.com/upload/youtube/v3/thumbnails/set",
 177             params={'videoId': audiobook.youtube_id},
 178             data=thumbnail.getvalue(),
 179         )
 180
 181     def prepare_thumbnail(self, audiobook):
 182         img = create_thumbnail(
 183             self.thumbnail_template.path,
 184             self.thumbnail_definition,
 185             {
 186                 "author": ', '.join((a['name'] for a in audiobook.book['authors'])),
 187                 "title": audiobook.book['title'],
 188             },
 189             lambda name: Font.objects.get(name=name).truetype.path
 190         )
 191         buf = io.BytesIO()
 192         img.save(buf, format='PNG')
 193         return buf
 194
 195
 196 class Card(models.Model):
 197     youtube = models.ForeignKey(YouTube, models.CASCADE)
 198     order = models.SmallIntegerField()
 199     image = models.FileField(upload_to='youtube/card')
 200     duration = models.FloatField()
 201
 202     class Meta:
 203         ordering = ('order', )
 204
 205
 206 class Font(models.Model):
 207     name = models.CharField(max_length=255, unique=True)
 208     truetype = models.FileField(upload_to='youtube/font')
 209
 210     def __str__(self):
 211         return self.name