mirror of
https://github.com/sile/hls_m3u8.git
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85 lines
2.7 KiB
Rust
85 lines
2.7 KiB
Rust
use crate::attribute::AttributePairs;
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use crate::types::{EncryptionMethod, InitializationVector, ProtocolVersion, QuotedString};
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use crate::{Error, ErrorKind, Result};
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use std::fmt;
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use std::str::{self, FromStr};
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/// Decryption key.
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///
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/// See: [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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#[allow(missing_docs)]
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct DecryptionKey {
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pub method: EncryptionMethod,
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pub uri: QuotedString,
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pub iv: Option<InitializationVector>,
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pub key_format: Option<QuotedString>,
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pub key_format_versions: Option<QuotedString>,
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}
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impl DecryptionKey {
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pub(crate) fn requires_version(&self) -> ProtocolVersion {
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if self.key_format.is_some() | self.key_format_versions.is_some() {
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ProtocolVersion::V5
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} else if self.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 DecryptionKey {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "METHOD={}", self.method)?;
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write!(f, ",URI={}", self.uri)?;
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if let Some(ref x) = self.iv {
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write!(f, ",IV={}", x)?;
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}
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if let Some(ref x) = self.key_format {
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write!(f, ",KEYFORMAT={}", x)?;
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}
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if let Some(ref x) = self.key_format_versions {
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write!(f, ",KEYFORMATVERSIONS={}", x)?;
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}
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Ok(())
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}
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}
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impl FromStr for DecryptionKey {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self> {
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let mut method = None;
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let mut uri = None;
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let mut iv = None;
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let mut key_format = None;
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let mut key_format_versions = None;
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let attrs = AttributePairs::parse(s);
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for attr in attrs {
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let (key, value) = track!(attr)?;
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match key {
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"METHOD" => method = Some(track!(value.parse())?),
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"URI" => uri = Some(track!(value.parse())?),
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"IV" => iv = Some(track!(value.parse())?),
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"KEYFORMAT" => key_format = Some(track!(value.parse())?),
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"KEYFORMATVERSIONS" => key_format_versions = Some(track!(value.parse())?),
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_ => {
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// [6.3.1. General Client Responsibilities]
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// > ignore any attribute/value pair with an unrecognized AttributeName.
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}
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}
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}
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let method = track_assert_some!(method, ErrorKind::InvalidInput);
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let uri = track_assert_some!(uri, ErrorKind::InvalidInput);
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Ok(DecryptionKey {
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method,
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uri,
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iv,
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key_format,
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key_format_versions,
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})
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}
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}
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