diff options
Diffstat (limited to 'yt_dlp/downloader/mhtml.py')
| -rw-r--r-- | yt_dlp/downloader/mhtml.py | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/yt_dlp/downloader/mhtml.py b/yt_dlp/downloader/mhtml.py new file mode 100644 index 0000000..d977dce --- /dev/null +++ b/yt_dlp/downloader/mhtml.py @@ -0,0 +1,189 @@ +import io +import quopri +import re +import uuid + +from .fragment import FragmentFD +from ..compat import imghdr +from ..utils import escapeHTML, formatSeconds, srt_subtitles_timecode, urljoin +from ..version import __version__ as YT_DLP_VERSION + + +class MhtmlFD(FragmentFD): + _STYLESHEET = """\ +html, body { + margin: 0; + padding: 0; + height: 100vh; +} + +html { + overflow-y: scroll; + scroll-snap-type: y mandatory; +} + +body { + scroll-snap-type: y mandatory; + display: flex; + flex-flow: column; +} + +body > figure { + max-width: 100vw; + max-height: 100vh; + scroll-snap-align: center; +} + +body > figure > figcaption { + text-align: center; + height: 2.5em; +} + +body > figure > img { + display: block; + margin: auto; + max-width: 100%; + max-height: calc(100vh - 5em); +} +""" + _STYLESHEET = re.sub(r'\s+', ' ', _STYLESHEET) + _STYLESHEET = re.sub(r'\B \B|(?<=[\w\-]) (?=[^\w\-])|(?<=[^\w\-]) (?=[\w\-])', '', _STYLESHEET) + + @staticmethod + def _escape_mime(s): + return '=?utf-8?Q?' + (b''.join( + bytes((b,)) if b >= 0x20 else b'=%02X' % b + for b in quopri.encodestring(s.encode(), header=True) + )).decode('us-ascii') + '?=' + + def _gen_cid(self, i, fragment, frag_boundary): + return '%u.%s@yt-dlp.github.io.invalid' % (i, frag_boundary) + + def _gen_stub(self, *, fragments, frag_boundary, title): + output = io.StringIO() + + output.write(( + '<!DOCTYPE html>' + '<html>' + '<head>' + '' '<meta name="generator" content="yt-dlp {version}">' + '' '<title>{title}</title>' + '' '<style>{styles}</style>' + '<body>' + ).format( + version=escapeHTML(YT_DLP_VERSION), + styles=self._STYLESHEET, + title=escapeHTML(title) + )) + + t0 = 0 + for i, frag in enumerate(fragments): + output.write('<figure>') + try: + t1 = t0 + frag['duration'] + output.write(( + '<figcaption>Slide #{num}: {t0} – {t1} (duration: {duration})</figcaption>' + ).format( + num=i + 1, + t0=srt_subtitles_timecode(t0), + t1=srt_subtitles_timecode(t1), + duration=formatSeconds(frag['duration'], msec=True) + )) + except (KeyError, ValueError, TypeError): + t1 = None + output.write(( + '<figcaption>Slide #{num}</figcaption>' + ).format(num=i + 1)) + output.write('<img src="cid:{cid}">'.format( + cid=self._gen_cid(i, frag, frag_boundary))) + output.write('</figure>') + t0 = t1 + + return output.getvalue() + + def real_download(self, filename, info_dict): + fragment_base_url = info_dict.get('fragment_base_url') + fragments = info_dict['fragments'][:1] if self.params.get( + 'test', False) else info_dict['fragments'] + title = info_dict.get('title', info_dict['format_id']) + origin = info_dict.get('webpage_url', info_dict['url']) + + ctx = { + 'filename': filename, + 'total_frags': len(fragments), + } + + self._prepare_and_start_frag_download(ctx, info_dict) + + extra_state = ctx.setdefault('extra_state', { + 'header_written': False, + 'mime_boundary': str(uuid.uuid4()).replace('-', ''), + }) + + frag_boundary = extra_state['mime_boundary'] + + if not extra_state['header_written']: + stub = self._gen_stub( + fragments=fragments, + frag_boundary=frag_boundary, + title=title + ) + + ctx['dest_stream'].write(( + 'MIME-Version: 1.0\r\n' + 'From: <nowhere@yt-dlp.github.io.invalid>\r\n' + 'To: <nowhere@yt-dlp.github.io.invalid>\r\n' + 'Subject: {title}\r\n' + 'Content-type: multipart/related; ' + '' 'boundary="{boundary}"; ' + '' 'type="text/html"\r\n' + 'X.yt-dlp.Origin: {origin}\r\n' + '\r\n' + '--{boundary}\r\n' + 'Content-Type: text/html; charset=utf-8\r\n' + 'Content-Length: {length}\r\n' + '\r\n' + '{stub}\r\n' + ).format( + origin=origin, + boundary=frag_boundary, + length=len(stub), + title=self._escape_mime(title), + stub=stub + ).encode()) + extra_state['header_written'] = True + + for i, fragment in enumerate(fragments): + if (i + 1) <= ctx['fragment_index']: + continue + + fragment_url = fragment.get('url') + if not fragment_url: + assert fragment_base_url + fragment_url = urljoin(fragment_base_url, fragment['path']) + + success = self._download_fragment(ctx, fragment_url, info_dict) + if not success: + continue + frag_content = self._read_fragment(ctx) + + frag_header = io.BytesIO() + frag_header.write( + b'--%b\r\n' % frag_boundary.encode('us-ascii')) + frag_header.write( + b'Content-ID: <%b>\r\n' % self._gen_cid(i, fragment, frag_boundary).encode('us-ascii')) + frag_header.write( + b'Content-type: %b\r\n' % f'image/{imghdr.what(h=frag_content) or "jpeg"}'.encode()) + frag_header.write( + b'Content-length: %u\r\n' % len(frag_content)) + frag_header.write( + b'Content-location: %b\r\n' % fragment_url.encode('us-ascii')) + frag_header.write( + b'X.yt-dlp.Duration: %f\r\n' % fragment['duration']) + frag_header.write(b'\r\n') + self._append_fragment( + ctx, frag_header.getvalue() + frag_content + b'\r\n') + + ctx['dest_stream'].write( + b'--%b--\r\n\r\n' % frag_boundary.encode('us-ascii')) + return self._finish_frag_download(ctx, info_dict) |