428 lines
14 KiB
Rust
428 lines
14 KiB
Rust
use std::{borrow::Borrow, collections::BTreeMap, str::FromStr};
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use fancy_regex::Regex;
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use once_cell::sync::Lazy;
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use rand::Rng;
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use url::Url;
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use crate::{dictionary, error::Error, error::Result, model::Language};
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const CONTENT_PLAYBACK_NONCE_ALPHABET: &[u8; 64] =
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b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
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/// Return the given capture group that matches first in a list of regexes
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pub fn get_cg_from_regexes<'a, I>(mut regexes: I, text: &str, cg: usize) -> Option<String>
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where
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I: Iterator<Item = &'a Regex>,
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{
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regexes
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.find_map(|pattern| pattern.captures(text).ok().flatten())
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.map(|c| c.get(cg).unwrap().as_str().to_owned())
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}
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/// Generate a random string with given length and byte charset.
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fn random_string(charset: &[u8], length: usize) -> String {
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let mut result = String::with_capacity(length);
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let mut rng = rand::thread_rng();
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for _ in 0..length {
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result.push(char::from(charset[rng.gen_range(0..charset.len())]));
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}
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result
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}
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/// Generate a 16 characters long random string used as a CPN (Content Playback Nonce)
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pub fn generate_content_playback_nonce() -> String {
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random_string(CONTENT_PLAYBACK_NONCE_ALPHABET, 16)
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}
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/// Split an URL into its base string and parameter map
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///
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/// Example:
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///
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/// `example.com/api?k1=v1&k2=v2 => example.com/api; {k1: v1, k2: v2}`
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pub fn url_to_params(url: &str) -> Result<(String, BTreeMap<String, String>)> {
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let mut parsed_url = Url::parse(url).or_else(|e| {
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Err(Error::Other(
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format!("could not parse url `{}` err: {}", url, e).into(),
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))
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})?;
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let url_params: BTreeMap<String, String> = parsed_url
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.query_pairs()
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.map(|(k, v)| (k.to_string(), v.to_string()))
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.collect();
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parsed_url.set_query(None);
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Ok((parsed_url.to_string(), url_params))
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}
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/// Parse a string after removing all non-numeric characters
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pub fn parse_numeric<F>(string: &str) -> core::result::Result<F, F::Err>
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where
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F: FromStr,
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{
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let mut buf = String::new();
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for c in string.chars() {
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if c.is_ascii_digit() {
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buf.push(c);
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}
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}
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buf.parse()
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}
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/// Parse all numbers occurring in a string and reurn them as a vec
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pub fn parse_numeric_vec<F>(string: &str) -> Vec<F>
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where
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F: FromStr,
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{
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let mut numbers = vec![];
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let mut buf = String::new();
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for c in string.chars() {
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if c.is_ascii_digit() {
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buf.push(c);
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} else if !buf.is_empty() {
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buf.parse::<F>().map_or((), |n| numbers.push(n));
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buf.clear();
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}
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}
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if !buf.is_empty() {
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buf.parse::<F>().map_or((), |n| numbers.push(n));
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}
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numbers
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}
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/// Parse textual video length (e.g. `0:49`, `2:02` or `1:48:18`)
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/// and return the duration in seconds.
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pub fn parse_video_length(text: &str) -> Option<u32> {
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static VIDEO_LENGTH_REGEX: Lazy<Regex> =
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Lazy::new(|| Regex::new(r#"(?:(\d+):)?(\d{1,2}):(\d{2})"#).unwrap());
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VIDEO_LENGTH_REGEX.captures(text).ok().flatten().map(|cap| {
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let hrs = cap
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.get(1)
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.and_then(|x| x.as_str().parse::<u32>().ok())
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.unwrap_or_default();
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let min = cap
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.get(2)
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.and_then(|x| x.as_str().parse::<u32>().ok())
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.unwrap_or_default();
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let sec = cap
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.get(3)
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.and_then(|x| x.as_str().parse::<u32>().ok())
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.unwrap_or_default();
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hrs * 3600 + min * 60 + sec
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})
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}
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pub fn parse_numeric_or_warn<F>(string: &str, warnings: &mut Vec<String>) -> Option<F>
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where
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F: FromStr,
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{
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let res = parse_numeric::<F>(string);
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if res.is_err() {
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warnings.push(format!("could not parse number `{}`", string));
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}
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res.ok()
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}
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pub fn parse_video_length_or_warn(text: &str, warnings: &mut Vec<String>) -> Option<u32> {
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let res = parse_video_length(text);
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if res.is_none() {
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warnings.push(format!("could not parse video length `{}`", text));
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}
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res
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}
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pub fn retry_delay(
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n_past_retries: u32,
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min_retry_interval: u32,
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max_retry_interval: u32,
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backoff_base: u32,
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) -> u32 {
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let unjittered_delay = backoff_base.checked_pow(n_past_retries).unwrap_or(u32::MAX);
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let jitter_factor = rand::thread_rng().gen_range(800..1500);
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let jittered_delay = unjittered_delay
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.checked_mul(jitter_factor)
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.unwrap_or(u32::MAX);
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min_retry_interval.max(jittered_delay.min(max_retry_interval))
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}
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/// Convert YouTube redirect URLs (`https://www.youtube.com/redirect?`) into regular URLs.
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///
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/// Also strips google analytics tracking parameters
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/// (`utm_source`, `utm_medium`, `utm_campaign`, `utm_content`) because google analytics is bad.
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pub fn sanitize_yt_url(url: &str) -> String {
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let mut parsed_url = ok_or_bail!(Url::parse(url), url.to_owned());
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// Convert redirect url
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if parsed_url.host_str().unwrap_or_default() == "www.youtube.com"
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&& parsed_url.path() == "/redirect"
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{
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if let Some((_, url)) = parsed_url.query_pairs().find(|(k, _)| k == "q") {
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parsed_url = ok_or_bail!(Url::parse(url.as_ref()), url.to_string());
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}
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}
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// Remove GA tracking params
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if parsed_url.query().is_some() {
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let params = parsed_url
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.query_pairs()
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.filter_map(|(k, v)| match k.borrow() {
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"utm_source" | "utm_medium" | "utm_campaign" | "utm_content" => None,
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_ => Some((k.to_string(), v.to_string())),
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})
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.collect::<Vec<_>>();
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// Set empty query string if there are no parameters to prevent urls from ending with /?
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if params.is_empty() {
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parsed_url.set_query(None);
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} else {
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parsed_url
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.query_pairs_mut()
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.clear()
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.extend_pairs(params)
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.finish();
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}
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}
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parsed_url.to_string()
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}
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pub trait TryRemove<T> {
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/// Removes and returns the element at position `index` within the vector,
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/// shifting all elements after it to the left.
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///
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/// Returns None if the index is out of bounds.
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///
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/// Note: Because this shifts over the remaining elements, it has a
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/// worst-case performance of *O*(*n*). If you don't need the order of elements
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/// to be preserved, use [`vec_try_swap_remove`] instead.
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fn try_remove(&mut self, index: usize) -> Option<T>;
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/// Removes an element from the vector and returns it.
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///
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/// The removed element is replaced by the last element of the vector.
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///
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/// Returns None if the index is out of bounds.
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///
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/// This does not preserve ordering, but is *O*(1).
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/// If you need to preserve the element order, use [`vec_try_remove`] instead.
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fn try_swap_remove(&mut self, index: usize) -> Option<T>;
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}
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impl<T> TryRemove<T> for Vec<T> {
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fn try_remove(&mut self, index: usize) -> Option<T> {
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if index < self.len() {
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Some(self.remove(index))
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} else {
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None
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}
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}
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fn try_swap_remove(&mut self, index: usize) -> Option<T> {
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if index < self.len() {
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Some(self.swap_remove(index))
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} else {
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None
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}
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}
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}
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/// Parse a large, textual number (e.g. `1.4M subscribers`, `22K views`)
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pub fn parse_large_numstr<F>(string: &str, lang: Language) -> Option<F>
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where
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F: TryFrom<u64>,
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{
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let dict_entry = dictionary::entry(lang);
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let decimal_point = match dict_entry.comma_decimal {
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true => ',',
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false => '.',
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};
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let (num, mut exp, filtered) = {
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let mut buf = String::new();
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let mut filtered = String::new();
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let mut exp = 0;
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let mut after_point = false;
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for c in string.chars() {
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if c.is_ascii_digit() {
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buf.push(c);
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if after_point {
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exp -= 1;
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}
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} else if c == decimal_point {
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after_point = true;
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} else if !matches!(c, '\u{200b}' | '.' | ',') {
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filtered.push(c);
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}
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}
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(ok_or_bail!(buf.parse::<u64>(), None), exp, filtered)
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};
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let lookup_token = |token: &str| match token {
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"K" | "k" => Some(3),
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_ => dict_entry.number_tokens.get(token).map(|t| *t as i32),
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};
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if dict_entry.by_char {
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exp += filtered
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.chars()
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.filter_map(|token| lookup_token(&token.to_string()))
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.sum::<i32>();
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} else {
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exp += filtered
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.split_whitespace()
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.filter_map(lookup_token)
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.sum::<i32>();
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}
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F::try_from(some_or_bail!(
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num.checked_mul(some_or_bail!(
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(10_u64).checked_pow(ok_or_bail!(exp.try_into(), None)),
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None
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)),
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None
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))
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.ok()
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}
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#[cfg(test)]
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mod tests {
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use std::{fs::File, io::BufReader, path::Path};
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use super::*;
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use rstest::rstest;
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#[rstest]
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#[case("1.000", 1000)]
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#[case("4 Hello World 2", 42)]
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fn t_parse_num(#[case] string: &str, #[case] expect: u32) {
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let n = parse_numeric::<u32>(string).unwrap();
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assert_eq!(n, expect);
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}
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#[rstest]
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#[case("15.03.2022", vec![15, 3, 2022])]
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#[case("4 Hello World 2", vec![4, 2])]
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#[case("最后更新时间：2020年1月3日", vec![2020, 1, 3])]
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fn t_parse_numeric_vec(#[case] string: &str, #[case] expect: Vec<u32>) {
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let n = parse_numeric_vec::<u32>(string);
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assert_eq!(n, expect);
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}
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#[rstest]
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#[case("0:49", Some(49))]
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#[case("bla 2:02 h3llo w0rld", Some(122))]
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#[case("18:22", Some(1102))]
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#[case("1:48:18", Some(6498))]
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#[case("102:12:39", Some(367959))]
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#[case("42", None)]
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fn t_parse_video_length(#[case] text: &str, #[case] expect: Option<u32>) {
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let n = parse_video_length(text);
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assert_eq!(n, expect);
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}
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#[rstest]
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#[case(0, 800, 1500)]
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#[case(1, 2400, 4500)]
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#[case(2, 7200, 13500)]
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#[case(100, 60000, 60000)]
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fn t_retry_delay(#[case] n: u32, #[case] expect_min: u32, #[case] expect_max: u32) {
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let res = retry_delay(n, 1000, 60000, 3);
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assert!(
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res >= expect_min && res <= expect_max,
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"res: {} not within {} and {}",
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res,
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expect_min,
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expect_max
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);
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}
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#[test]
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fn t_vec_try_remove() {
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let mut v = vec![1, 2, 3];
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assert_eq!(v.try_remove(0).unwrap(), 1);
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assert_eq!(v.try_remove(1).unwrap(), 3);
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assert_eq!(v.try_remove(1), None);
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}
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#[test]
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fn t_vec_try_swap_remove() {
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let mut v = vec![1, 2, 3];
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assert_eq!(v.try_swap_remove(0).unwrap(), 1);
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assert_eq!(v.try_swap_remove(1).unwrap(), 2);
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assert_eq!(v.try_swap_remove(1), None);
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}
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#[rstest]
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#[case(
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"https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbXFjbjZ6bWdHc1VFLVNBN1NiRGR1QmRuR0lGZ3xBQ3Jtc0trcG1fWHpRNlE2eGNER0ZGczFlZXM5ZlctZzFSbl8wcHdieTlTb1ktSUc5OTZxVDVQamcxdS0yRjJJelFWTGdOS09nUk8xRExqbWhOSG5MTm83WG1QQzJqZTJuT2d6cGp0cEZTWmdsal80ODk0WkNESQ&q=http%3A%2F%2Fincompetech.com%2Fmusic%2Froyalty-free%2F&v=86YLFOog4GM",
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"http://incompetech.com/music/royalty-free/",
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)]
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#[case("https://www.gnu.org", "https://www.gnu.org/")]
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#[case(
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"https://www.youtube.com/watch?v=Rp2V7d69hyM",
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"https://www.youtube.com/watch?v=Rp2V7d69hyM"
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)]
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#[case(
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"https://www.youtube.com/redirect?event=product_shelf&redir_token=QUFFLUhqbDVUMUF3SndkcDFJbzMxYkNIMDRWSzRVQU84QXxBQ3Jtc0tsQWdpaUlaMzFUQmQwSGYwR3dDRDhHWld1bFFtUmlmMng0MmxtN19iVW1EeV9oSk1Xb1VlQ1UyT2xUOWhPdUZvVEZ6UWE4Unlia3pwZXhpUmd4RVg4eWZtcHFId2RJVkMyMUFIMDhiUVUzc2x6ZVNxbw&q=https%3A%2F%2Flttstore.com%2F%3Futm_medium%3Dproduct_shelf%26utm_source%3Dyoutube%26utm_content%3DYT-AERwsnLS3vZeiqL7_mR16DPg7FPBWvP7OW-zX2M1UIPlexPS8-gpk-2c3epSZ8lJ5NYbLof0MXDKhRLCSyfOn9BYJrcG8YtpTA9VU2VXUVhhl9AKi87G_-vFhj6jcGN1CWcYYvmZYbIqA93kwkeFuUh46ntDZR1Y8p5WygwVlhfxy_BZiNbzkWw%253D&v=nFDBxBUfE74",
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"https://lttstore.com/",
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)]
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fn t_sanitize_yt_url(#[case] url: &str, #[case] expect: &str) {
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let res = sanitize_yt_url(url);
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assert_eq!(res, expect);
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}
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#[test]
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fn t_parse_large_numstr_samples() {
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let json_path = Path::new("testfiles/dict/large_number_samples.json");
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let json_file = File::open(json_path).unwrap();
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let number_samples: BTreeMap<Language, BTreeMap<u8, (String, u64)>> =
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serde_json::from_reader(BufReader::new(json_file)).unwrap();
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number_samples.iter().for_each(|(lang, entry)| {
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entry.iter().for_each(|(_, (txt, expect))| {
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testcase_parse_large_numstr(txt, *lang, *expect);
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});
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});
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}
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#[test]
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fn t_parse_large_numstr_samples2() {
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let json_path = Path::new("testfiles/dict/large_number_samples_all.json");
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let json_file = File::open(json_path).unwrap();
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let number_samples: BTreeMap<Language, BTreeMap<String, u64>> =
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serde_json::from_reader(BufReader::new(json_file)).unwrap();
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number_samples.iter().for_each(|(lang, entry)| {
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entry.iter().for_each(|(txt, expect)| {
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testcase_parse_large_numstr(txt, *lang, *expect);
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});
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});
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}
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fn testcase_parse_large_numstr(string: &str, lang: Language, expect: u64) {
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// Round the expected number to the amount of significant digits included
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// in the string.
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let rounded = {
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let n_significant_d = string.chars().filter(char::is_ascii_digit).count();
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let mag = (expect as f64).log10().floor();
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let factor = 10_u64.pow(1 + mag as u32 - n_significant_d as u32);
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(((expect as f64) / factor as f64).floor() as u64) * factor
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};
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let res = parse_large_numstr::<u64>(string, lang).expect(string);
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assert_eq!(
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res, rounded,
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"{} (lang: {}, exact: {})",
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string, lang, expect
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);
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}
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}
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