conduwuit/src/utils.rs
2021-03-04 12:29:08 +01:00

115 lines
3.5 KiB
Rust

use argon2::{Config, Variant};
use cmp::Ordering;
use rand::prelude::*;
use ruma::serde::{try_from_json_map, CanonicalJsonError, CanonicalJsonObject};
use sled::IVec;
use std::{
cmp,
convert::TryInto,
time::{SystemTime, UNIX_EPOCH},
};
pub fn millis_since_unix_epoch() -> u64 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("time is valid")
.as_millis() as u64
}
pub fn increment(old: Option<&[u8]>) -> Option<Vec<u8>> {
let number = match old.map(|bytes| bytes.try_into()) {
Some(Ok(bytes)) => {
let number = u64::from_be_bytes(bytes);
number + 1
}
_ => 1, // Start at one. since 0 should return the first event in the db
};
Some(number.to_be_bytes().to_vec())
}
pub fn generate_keypair(old: Option<&[u8]>) -> Option<Vec<u8>> {
Some(old.map(|s| s.to_vec()).unwrap_or_else(|| {
let mut value = random_string(8).as_bytes().to_vec();
value.push(0xff);
value.extend_from_slice(
&ruma::signatures::Ed25519KeyPair::generate()
.expect("Ed25519KeyPair generation always works (?)"),
);
value
}))
}
/// Parses the bytes into an u64.
pub fn u64_from_bytes(bytes: &[u8]) -> Result<u64, std::array::TryFromSliceError> {
let array: [u8; 8] = bytes.try_into()?;
Ok(u64::from_be_bytes(array))
}
/// Parses the bytes into a string.
pub fn string_from_bytes(bytes: &[u8]) -> Result<String, std::string::FromUtf8Error> {
String::from_utf8(bytes.to_vec())
}
pub fn random_string(length: usize) -> String {
thread_rng()
.sample_iter(&rand::distributions::Alphanumeric)
.take(length)
.map(char::from)
.collect()
}
/// Calculate a new hash for the given password
pub fn calculate_hash(password: &str) -> Result<String, argon2::Error> {
let hashing_config = Config {
variant: Variant::Argon2id,
..Default::default()
};
let salt = random_string(32);
argon2::hash_encoded(password.as_bytes(), salt.as_bytes(), &hashing_config)
}
pub fn common_elements(
mut iterators: impl Iterator<Item = impl Iterator<Item = IVec>>,
check_order: impl Fn(&IVec, &IVec) -> Ordering,
) -> Option<impl Iterator<Item = IVec>> {
let first_iterator = iterators.next()?;
let mut other_iterators = iterators.map(|i| i.peekable()).collect::<Vec<_>>();
Some(first_iterator.filter(move |target| {
other_iterators
.iter_mut()
.map(|it| {
while let Some(element) = it.peek() {
match check_order(element, target) {
Ordering::Greater => return false, // We went too far
Ordering::Equal => return true, // Element is in both iters
Ordering::Less => {
// Keep searching
it.next();
}
}
}
false
})
.all(|b| b)
}))
}
/// Fallible conversion from any value that implements `Serialize` to a `CanonicalJsonObject`.
///
/// `value` must serialize to an `serde_json::Value::Object`.
pub fn to_canonical_object<T: serde::Serialize>(
value: T,
) -> Result<CanonicalJsonObject, CanonicalJsonError> {
use serde::ser::Error;
match serde_json::to_value(value).map_err(CanonicalJsonError::SerDe)? {
serde_json::Value::Object(map) => try_from_json_map(map),
_ => Err(CanonicalJsonError::SerDe(serde_json::Error::custom(
"Value must be an object",
))),
}
}