mirror of
https://github.com/sile/hls_m3u8.git
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131 lines
4.5 KiB
Rust
131 lines
4.5 KiB
Rust
use crate::attribute::AttributePairs;
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use crate::types::{DecryptionKey, ProtocolVersion};
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use crate::{Error, ErrorKind, Result};
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use std::fmt;
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use std::str::FromStr;
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/// [4.3.2.4. EXT-X-KEY]
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///
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/// [4.3.2.4. EXT-X-KEY]: https://tools.ietf.org/html/rfc8216#section-4.3.2.4
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct ExtXKey {
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key: Option<DecryptionKey>,
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}
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impl ExtXKey {
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pub(crate) const PREFIX: &'static str = "#EXT-X-KEY:";
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/// Makes a new `ExtXKey` tag.
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pub fn new(key: DecryptionKey) -> Self {
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ExtXKey { key: Some(key) }
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}
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/// Makes a new `ExtXKey` tag without a decryption key.
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///
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/// This tag has the `METHDO=NONE` attribute.
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pub fn new_without_key() -> Self {
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ExtXKey { key: None }
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}
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/// Returns the decryption key for the following media segments and media initialization sections.
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pub fn key(&self) -> Option<&DecryptionKey> {
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self.key.as_ref()
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}
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/// Returns the protocol compatibility version that this tag requires.
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pub fn requires_version(&self) -> ProtocolVersion {
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self.key
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.as_ref()
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.map_or(ProtocolVersion::V1, |k| k.requires_version())
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}
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}
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impl fmt::Display for ExtXKey {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", Self::PREFIX)?;
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if let Some(ref key) = self.key {
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write!(f, "{}", key)?;
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} else {
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write!(f, "METHOD=NONE")?;
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}
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Ok(())
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}
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}
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impl FromStr for ExtXKey {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self> {
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track_assert!(s.starts_with(Self::PREFIX), ErrorKind::InvalidInput);
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let suffix = s.split_at(Self::PREFIX.len()).1;
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if AttributePairs::parse(suffix).any(|a| a.as_ref().ok() == Some(&("METHOD", "NONE"))) {
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for attr in AttributePairs::parse(suffix) {
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let (key, _) = track!(attr)?;
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track_assert_ne!(key, "URI", ErrorKind::InvalidInput);
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track_assert_ne!(key, "IV", ErrorKind::InvalidInput);
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track_assert_ne!(key, "KEYFORMAT", ErrorKind::InvalidInput);
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track_assert_ne!(key, "KEYFORMATVERSIONS", ErrorKind::InvalidInput);
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}
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Ok(ExtXKey { key: None })
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} else {
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let key = track!(suffix.parse())?;
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Ok(ExtXKey { key: Some(key) })
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}
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::types::{EncryptionMethod, InitializationVector, QuotedString};
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#[test]
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fn ext_x_key() {
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let tag = ExtXKey::new_without_key();
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let text = "#EXT-X-KEY:METHOD=NONE";
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assert_eq!(text.parse().ok(), Some(tag.clone()));
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assert_eq!(tag.to_string(), text);
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assert_eq!(tag.requires_version(), ProtocolVersion::V1);
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let tag = ExtXKey::new(DecryptionKey {
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method: EncryptionMethod::Aes128,
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uri: QuotedString::new("foo").unwrap(),
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iv: None,
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key_format: None,
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key_format_versions: None,
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});
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let text = r#"#EXT-X-KEY:METHOD=AES-128,URI="foo""#;
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assert_eq!(text.parse().ok(), Some(tag.clone()));
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assert_eq!(tag.to_string(), text);
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assert_eq!(tag.requires_version(), ProtocolVersion::V1);
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let tag = ExtXKey::new(DecryptionKey {
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method: EncryptionMethod::Aes128,
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uri: QuotedString::new("foo").unwrap(),
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iv: Some(InitializationVector([
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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])),
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key_format: None,
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key_format_versions: None,
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});
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let text = r#"#EXT-X-KEY:METHOD=AES-128,URI="foo",IV=0x000102030405060708090a0b0c0d0e0f"#;
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assert_eq!(text.parse().ok(), Some(tag.clone()));
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assert_eq!(tag.to_string(), text);
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assert_eq!(tag.requires_version(), ProtocolVersion::V2);
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let tag = ExtXKey::new(DecryptionKey {
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method: EncryptionMethod::Aes128,
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uri: QuotedString::new("foo").unwrap(),
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iv: Some(InitializationVector([
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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])),
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key_format: Some(QuotedString::new("baz").unwrap()),
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key_format_versions: None,
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});
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let text = r#"#EXT-X-KEY:METHOD=AES-128,URI="foo",IV=0x000102030405060708090a0b0c0d0e0f,KEYFORMAT="baz""#;
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assert_eq!(text.parse().ok(), Some(tag.clone()));
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assert_eq!(tag.to_string(), text);
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assert_eq!(tag.requires_version(), ProtocolVersion::V5);
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}
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}
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