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// yt - A fully featured command line YouTube client
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Yt.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
use std::{collections::HashMap, fmt::Display, str::FromStr};
use anyhow::{bail, Result};
use blake3::Hash;
use log::debug;
use tokio::sync::OnceCell;
use crate::{app::App, storage::video_database::getters::get_all_hashes};
static EXTRACTOR_HASH_LENGTH: OnceCell<usize> = OnceCell::const_new();
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ExtractorHash {
hash: Hash,
}
#[derive(Debug, Clone)]
pub struct ShortHash(String);
impl Display for ShortHash {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.0.fmt(f)
}
}
#[derive(Debug, Clone)]
pub struct LazyExtractorHash {
value: ShortHash,
}
impl FromStr for LazyExtractorHash {
type Err = anyhow::Error;
fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
// perform some cheap validation
if s.len() > 64 {
bail!("A hash can only contain 64 bytes!");
}
Ok(Self {
value: ShortHash(s.to_owned()),
})
}
}
impl LazyExtractorHash {
/// Turn the [`LazyExtractorHash`] into the [`ExtractorHash`]
pub async fn realize(self, app: &App) -> Result<ExtractorHash> {
ExtractorHash::from_short_hash(app, &self.value).await
}
}
impl ExtractorHash {
pub fn from_hash(hash: Hash) -> Self {
Self { hash }
}
pub async fn from_short_hash(app: &App, s: &ShortHash) -> Result<Self> {
Ok(Self {
hash: Self::short_hash_to_full_hash(app, s).await?,
})
}
pub fn hash(&self) -> &Hash {
&self.hash
}
pub async fn into_short_hash(&self, app: &App) -> Result<ShortHash> {
let needed_chars = if let Some(needed_chars) = EXTRACTOR_HASH_LENGTH.get() {
debug!("Using cached char length: {}", needed_chars);
*needed_chars
} else {
let needed_chars = self.get_needed_char_len(app).await?;
debug!("Setting the needed has char lenght.");
EXTRACTOR_HASH_LENGTH
.set(needed_chars)
.expect("This should work at this stage");
needed_chars
};
debug!("Formatting a hash with char length: {}", needed_chars);
Ok(ShortHash(
self.hash()
.to_hex()
.chars()
.into_iter()
.take(needed_chars)
.collect::<String>(),
))
}
async fn short_hash_to_full_hash(app: &App, s: &ShortHash) -> Result<Hash> {
let all_hashes = get_all_hashes(app).await?;
let needed_chars = s.0.len();
for hash in all_hashes {
if &hash.to_hex()[..needed_chars] == s.0 {
return Ok(hash);
}
}
bail!("Your shortend hash, does not match a real hash (this is probably a bug)!");
}
async fn get_needed_char_len(&self, app: &App) -> Result<usize> {
debug!("Calculating the needed hash char length");
let all_hashes = get_all_hashes(app).await?;
let all_char_vec_hashes = all_hashes
.into_iter()
.map(|hash| hash.to_hex().chars().collect::<Vec<char>>())
.collect::<Vec<Vec<_>>>();
// This value should be updated later, if not rust will panic in the assertion.
let mut needed_chars: usize = 1000;
'outer: for i in 1..64 {
let i_chars: Vec<String> = all_char_vec_hashes
.iter()
.map(|vec| vec.iter().take(i).collect::<String>())
.collect();
let mut uniqnes_hashmap: HashMap<String, ()> = HashMap::new();
for ch in i_chars {
if let Some(()) = uniqnes_hashmap.insert(ch, ()) {
// The key was already in the hash map, thus we have a duplicated char and need
// at least one char more
continue 'outer;
}
}
needed_chars = i;
break 'outer;
}
assert!(needed_chars <= 64, "Hashes are only 64 bytes long");
Ok(needed_chars)
}
}
|
