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from django.core.files.images import get_image_dimensions
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from django.template.defaultfilters import filesizeformat
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from django.contrib.staticfiles.templatetags.staticfiles import static
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FILE_STUB_IMAGE = 'images/file.png'
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FILE_STUB_URL = 'url'
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FILE_TYPES_VIDEO = (
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'webm',
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'mp4',
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'mpeg',
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'ogv',
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)
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FILE_TYPE_SVG = 'svg'
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FILE_TYPES_AUDIO = (
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'ogg',
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'mp3',
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'opus',
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)
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FILE_TYPES_IMAGE = (
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'jpeg',
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'jpg',
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'png',
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'bmp',
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'gif',
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)
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PLAIN_FILE_FORMATS = {
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'pdf': 'pdf',
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'djvu': 'djvu',
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'txt': 'txt',
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'tex': 'tex',
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'xcf': 'xcf',
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}
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URL_PROTOCOLS = {
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'magnet': 'magnet',
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}
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CSS_CLASS_IMAGE = 'image'
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CSS_CLASS_THUMB = 'thumb'
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def get_viewers():
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return AbstractViewer.__subclasses__()
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class AbstractViewer:
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def __init__(self, file, file_type, hash, url):
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self.file = file
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self.file_type = file_type
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self.hash = hash
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self.url = url
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@staticmethod
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def supports(file_type):
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return True
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def get_view(self):
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return '<div class="image">'\
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'{}'\
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'<div class="image-metadata"><a href="{}" download >{}, {}</a></div>'\
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'</div>'.format(self.get_format_view(), self.file.url,
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self.file_type, filesizeformat(self.file.size))
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def get_format_view(self):
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if self.file_type in PLAIN_FILE_FORMATS:
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image = 'images/fileformats/{}.png'.format(
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PLAIN_FILE_FORMATS[self.file_type])
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else:
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image = FILE_STUB_IMAGE
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return '<a href="{}">'\
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'<img class="url-image" src="{}" width="200" height="150"/>'\
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'</a>'.format(self.file.url, static(image))
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class VideoViewer(AbstractViewer):
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@staticmethod
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def supports(file_type):
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return file_type in FILE_TYPES_VIDEO
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def get_format_view(self):
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return '<video width="200" height="150" controls src="{}"></video>'\
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.format(self.file.url)
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class AudioViewer(AbstractViewer):
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@staticmethod
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def supports(file_type):
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return file_type in FILE_TYPES_AUDIO
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def get_format_view(self):
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return '<audio controls src="{}"></audio>'.format(self.file.url)
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class SvgViewer(AbstractViewer):
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@staticmethod
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def supports(file_type):
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return file_type == FILE_TYPE_SVG
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def get_format_view(self):
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return '<a class="thumb" href="{}">'\
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'<img class="post-image-preview" width="200" height="150" src="{}" />'\
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'</a>'.format(self.file.url, self.file.url)
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class ImageViewer(AbstractViewer):
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@staticmethod
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def supports(file_type):
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return file_type in FILE_TYPES_IMAGE
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def get_format_view(self):
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metadata = '{}, {}'.format(self.file.name.split('.')[-1],
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filesizeformat(self.file.size))
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width, height = get_image_dimensions(self.file.file)
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preview_path = self.file.path.replace('.', '.200x150.')
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pre_width, pre_height = get_image_dimensions(preview_path)
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split = self.file.url.rsplit('.', 1)
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w, h = 200, 150
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thumb_url = '%s.%sx%s.%s' % (split[0], w, h, split[1])
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return '<a class="{}" href="{full}">' \
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'<img class="post-image-preview"' \
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' src="{}"' \
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' alt="{}"' \
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' width="{}"' \
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' height="{}"' \
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' data-width="{}"' \
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' data-height="{}" />' \
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'</a>' \
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.format(CSS_CLASS_THUMB,
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thumb_url,
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self.hash,
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str(pre_width),
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str(pre_height), str(width), str(height),
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full=self.file.url, image_meta=metadata)
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class UrlViewer(AbstractViewer):
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@staticmethod
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def supports(file_type):
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return file_type is None
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def get_view(self):
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return '<div class="image">' \
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'{}' \
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'</div>'.format(self.get_format_view())
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def get_format_view(self):
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protocol = self.url.split('://')[0]
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url_image_name = URL_PROTOCOLS.get(protocol, FILE_STUB_URL)
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image = static('images/' + url_image_name + '.png')
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return '<a href="{}">' \
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'<img class="url-image" src="{}" width="200" height="150"/>' \
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'</a>'.format(self.url, image)
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