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WebVTT::Builder: Add logic to escape special chars

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syeopite 2024-01-30 15:25:45 -08:00
parent 1c0b4205d4
commit 0ad2eff2a4
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2 changed files with 59 additions and 22 deletions
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16
src/invidious/helpers/webvtt.cr
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@ -4,13 +4,23 @@
module WebVTT
# A WebVTT builder generates WebVTT files
private class Builder
# See https://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API#cue_payload
private ESCAPE_SUBSTITUTIONS = {
'&' => "&",
'<' => "&lt;",
'>' => "&gt;",
'\u200E' => "&lrm;",
'\u200F' => "&rlm;",
'\u00A0' => "&nbsp;",
}
def initialize(@io : IO)
end
# Writes an vtt cue with the specified time stamp and contents
def cue(start_time : Time::Span, end_time : Time::Span, text : String)
timestamp(start_time, end_time)
@io << text
@io << self.escape(text)
@io << "\n\n"
end
@ -29,6 +39,10 @@ module WebVTT
@io << '.' << timestamp.milliseconds.to_s.rjust(3, '0')
end
private def escape(text : String) : String
return text.gsub(ESCAPE_SUBSTITUTIONS)
end
def document(setting_fields : Hash(String, String)? = nil, &)
@io << "WEBVTT\n"