Paul van Tilburg
3ec1879932
* Drop the depend on the `tokio` crate, because we don't need to run our own processes anymore. * Remove unnecessary error variant for command failure
146 lines
4.1 KiB
Rust
146 lines
4.1 KiB
Rust
//! The Mixcloud back-end.
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//!
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//! It uses the Mixcloud API to retrieve the feed (user) and items (cloudcasts)).
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//! See also: <https://www.mixcloud.com/developers/>
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use chrono::{DateTime, Utc};
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use reqwest::Url;
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use rocket::serde::Deserialize;
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use youtube_dl::{YoutubeDl, YoutubeDlOutput};
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use super::{Error, Result};
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/// A Mixcloud user.
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#[derive(Debug, Deserialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct User {
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/// The name of the user.
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pub(crate) name: String,
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/// The bio (description) of the user.
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pub(crate) biog: String,
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/// The picture URLs associated with the user.
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pub(crate) pictures: Pictures,
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/// The original URL of the user.
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pub(crate) url: String,
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}
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/// A collection of different sizes/variants of a picture.
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#[derive(Debug, Deserialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct Pictures {
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/// The large picture of the user.
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pub(crate) large: String,
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}
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/// The Mixcloud cloudcasts container.
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#[derive(Debug, Deserialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct CloudcastData {
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/// The contained cloudcasts.
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data: Vec<Cloudcast>,
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}
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/// A Mixcloud cloudcast.
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#[derive(Debug, Deserialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct Cloudcast {
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/// The key of the cloudcast.
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pub(crate) key: String,
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/// The name of the cloudcast.
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pub(crate) name: String,
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/// The slug of the cloudcast (used for the enclosure).
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pub(crate) slug: String,
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/// The picture URLs associated with the cloudcast.
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pub(crate) pictures: Pictures,
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/// The tags of the cloudcast.
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pub(crate) tags: Vec<Tag>,
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/// The time the feed was created/started.
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pub(crate) updated_time: DateTime<Utc>,
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/// The original URL of the cloudcast.
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pub(crate) url: String,
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/// The length of the cloudcast (in seconds).
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pub(crate) audio_length: u32,
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}
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/// A Mixcloud cloudcast tag.
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#[derive(Debug, Deserialize)]
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#[serde(crate = "rocket::serde")]
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pub(crate) struct Tag {
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/// The name of the tag.
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pub(crate) name: String,
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/// The URL of the tag.
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pub(crate) url: String,
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}
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/// The base URL for the Mixcloud API.
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const API_BASE_URL: &str = "https://api.mixcloud.com";
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/// The base URL for downloading Mixcloud files.
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const FILES_BASE_URL: &str = "https://www.mixcloud.com";
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/// The default bitrate used by
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const DEFAULT_BITRATE: u32 = 64 * 1024;
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/// The default file (MIME) type.
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const DEFAULT_FILE_TYPE: &str = "audio/mpeg";
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/// Returns the default file type used by Mixcloud.
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pub(crate) fn default_file_type() -> &'static str {
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DEFAULT_FILE_TYPE
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}
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/// Returns the estimated file size in bytes for a given duration.
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///
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/// This uses the default bitrate (see [`DEFAULT_BITRATE`]) which is in B/s.
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pub(crate) fn estimated_file_size(duration: u32) -> u32 {
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DEFAULT_BITRATE * duration / 8
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}
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/// Retrieves the user data using the Mixcloud API.
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pub(crate) async fn get_user(username: &str) -> Result<User> {
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let mut url = Url::parse(API_BASE_URL).expect("URL can always be parsed");
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url.set_path(username);
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println!("⏬ Retrieving user {username} from {url}...");
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let response = reqwest::get(url).await?.error_for_status()?;
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let user = response.json().await?;
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Ok(user)
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}
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/// Retrieves the cloudcasts of the user using the Mixcloud API.
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pub(crate) async fn get_cloudcasts(username: &str) -> Result<Vec<Cloudcast>> {
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let mut url = Url::parse(API_BASE_URL).expect("URL can always be parsed");
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url.set_path(&format!("{username}/cloudcasts/"));
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println!("⏬ Retrieving cloudcasts of user {username} from {url}...");
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let response = reqwest::get(url).await?.error_for_status()?;
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let cloudcasts: CloudcastData = response.json().await?;
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Ok(cloudcasts.data)
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}
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/// Retrieves the redirect URL for the provided Mixcloud cloudcast key.
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pub(crate) async fn redirect_url(key: &str) -> Result<String> {
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let url = format!("{FILES_BASE_URL}{key}");
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println!("🌍 Determining direct URL for {key}...");
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let output = YoutubeDl::new(&url).run_async().await?;
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if let YoutubeDlOutput::SingleVideo(yt_item) = output {
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yt_item.url.ok_or(Error::NoRedirectUrlFound)
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} else {
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Err(Error::NoRedirectUrlFound)
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}
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}
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