mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-06-10 01:09:27 +00:00
147 lines
4 KiB
Rust
147 lines
4 KiB
Rust
use std::fmt;
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use std::ops::{Deref, DerefMut};
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use std::str::FromStr;
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use crate::types::{DecryptionKey, EncryptionMethod, ProtocolVersion};
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use crate::utils::tag;
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use crate::Error;
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/// [4.3.4.5. EXT-X-SESSION-KEY]
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///
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/// [4.3.4.5. EXT-X-SESSION-KEY]: https://tools.ietf.org/html/rfc8216#section-4.3.4.5
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct ExtXSessionKey(DecryptionKey);
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impl ExtXSessionKey {
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pub(crate) const PREFIX: &'static str = "#EXT-X-SESSION-KEY:";
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/// Makes a new [ExtXSessionKey] tag.
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/// # Panic
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/// This method will panic, if the [EncryptionMethod] is None.
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pub fn new<T: ToString>(method: EncryptionMethod, uri: T) -> Self {
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if method == EncryptionMethod::None {
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panic!("The EncryptionMethod is not allowed to be None");
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}
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Self(DecryptionKey::new(method, uri))
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}
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/// Returns the protocol compatibility version that this tag requires.
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/// # Example
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/// ```
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/// use hls_m3u8::tags::ExtXSessionKey;
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/// use hls_m3u8::types::{EncryptionMethod, ProtocolVersion};
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///
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/// let mut key = ExtXSessionKey::new(
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/// EncryptionMethod::Aes128,
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/// "https://www.example.com/"
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/// );
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///
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/// assert_eq!(
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/// key.requires_version(),
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/// ProtocolVersion::V1
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/// );
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/// ```
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pub fn requires_version(&self) -> ProtocolVersion {
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if self.0.key_format.is_some() | self.0.key_format_versions.is_some() {
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ProtocolVersion::V5
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} else if self.0.iv.is_some() {
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ProtocolVersion::V2
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} else {
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ProtocolVersion::V1
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}
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}
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}
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impl fmt::Display for ExtXSessionKey {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}{}", Self::PREFIX, self.0)
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}
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}
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impl FromStr for ExtXSessionKey {
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type Err = Error;
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fn from_str(input: &str) -> Result<Self, Self::Err> {
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let input = tag(input, Self::PREFIX)?;
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Ok(Self(input.parse()?))
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}
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}
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impl Deref for ExtXSessionKey {
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type Target = DecryptionKey;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl DerefMut for ExtXSessionKey {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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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;
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#[test]
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fn test_display() {
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let mut key = ExtXSessionKey::new(
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EncryptionMethod::Aes128,
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"https://www.example.com/hls-key/key.bin",
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);
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key.set_iv([
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16, 239, 143, 117, 140, 165, 85, 17, 85, 132, 187, 91, 60, 104, 127, 82,
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]);
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assert_eq!(
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key.to_string(),
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"#EXT-X-SESSION-KEY:METHOD=AES-128,\
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URI=\"https://www.example.com/hls-key/key.bin\",\
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IV=0x10ef8f758ca555115584bb5b3c687f52"
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.to_string()
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);
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}
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#[test]
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fn test_parser() {
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assert_eq!(
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r#"#EXT-X-SESSION-KEY:METHOD=AES-128,URI="https://priv.example.com/key.php?r=52""#
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.parse::<ExtXSessionKey>()
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.unwrap(),
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ExtXSessionKey::new(
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EncryptionMethod::Aes128,
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"https://priv.example.com/key.php?r=52"
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)
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);
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let mut key = ExtXSessionKey::new(
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EncryptionMethod::Aes128,
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"https://www.example.com/hls-key/key.bin",
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);
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key.set_iv([
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16, 239, 143, 117, 140, 165, 85, 17, 85, 132, 187, 91, 60, 104, 127, 82,
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]);
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assert_eq!(
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"#EXT-X-SESSION-KEY:METHOD=AES-128,\
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URI=\"https://www.example.com/hls-key/key.bin\",\
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IV=0X10ef8f758ca555115584bb5b3c687f52"
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.parse::<ExtXSessionKey>()
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.unwrap(),
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key
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);
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key.set_key_format("baz");
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assert_eq!(
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r#"#EXT-X-SESSION-KEY:METHOD=AES-128,URI="https://www.example.com/hls-key/key.bin",IV=0x10ef8f758ca555115584bb5b3c687f52,KEYFORMAT="baz""#
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.parse::<ExtXSessionKey>().unwrap(),
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key
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)
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}
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}
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