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[extractor/common] Properly escape % in MPD templates (closes #16867)
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@ -2106,7 +2106,21 @@ class InfoExtractor(object):
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representation_ms_info = extract_multisegment_info(representation, adaption_set_ms_info)
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def prepare_template(template_name, identifiers):
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t = representation_ms_info[template_name]
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tmpl = representation_ms_info[template_name]
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# First of, % characters outside $...$ templates
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# must be escaped by doubling for proper processing
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# by % operator string formatting used further (see
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# https://github.com/rg3/youtube-dl/issues/16867).
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t = ''
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in_template = False
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for c in tmpl:
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t += c
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if c == '$':
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in_template = not in_template
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elif c == '%' and not in_template:
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t += c
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# Next, $...$ templates are translated to their
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# %(...) counterparts to be used with % operator
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t = t.replace('$RepresentationID$', representation_id)
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t = re.sub(r'\$(%s)\$' % '|'.join(identifiers), r'%(\1)d', t)
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t = re.sub(r'\$(%s)%%([^$]+)\$' % '|'.join(identifiers), r'%(\1)\2', t)
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