106 lines
3.5 KiB
Rust
106 lines
3.5 KiB
Rust
use std::fmt::{Display, Formatter};
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use std::sync::Arc;
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use gloo_console::log;
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use js_sys::{Array, Uint8Array};
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use omegaupload_common::crypto::{open_in_place, Key, Nonce};
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use wasm_bindgen::JsCast;
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use web_sys::Blob;
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#[derive(Clone)]
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pub enum DecryptedData {
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String(Arc<String>),
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Blob(Arc<Blob>),
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Image(Arc<Blob>, usize),
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Audio(Arc<Blob>),
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Video(Arc<Blob>),
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}
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fn now() -> f64 {
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web_sys::window()
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.expect("should have a Window")
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.performance()
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.expect("should have a Performance")
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.now()
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}
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pub fn decrypt(
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mut container: Vec<u8>,
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key: Key,
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nonce: Nonce,
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maybe_password: Option<Key>,
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) -> Result<DecryptedData, PasteCompleteConstructionError> {
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let container = &mut container;
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log!("Stage 1 decryption started.");
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let start = now();
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if let Some(password) = maybe_password {
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crate::render_message("Decrypting Stage 1...".into());
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open_in_place(container, &nonce.increment(), &password).map_err(|_| {
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crate::render_message("Unable to decrypt paste with the provided password.".into());
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PasteCompleteConstructionError::StageOneFailure
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})?;
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}
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log!(format!("Stage 1 completed in {}ms", now() - start));
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log!("Stage 2 decryption started.");
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let start = now();
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crate::render_message("Decrypting Stage 2...".into());
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open_in_place(container, &nonce, &key).map_err(|_| {
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crate::render_message(
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"Unable to decrypt paste with the provided encryption key and nonce.".into(),
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);
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PasteCompleteConstructionError::StageTwoFailure
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})?;
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log!(format!("Stage 2 completed in {}ms", now() - start));
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if let Ok(decrypted) = std::str::from_utf8(container) {
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Ok(DecryptedData::String(Arc::new(decrypted.to_owned())))
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} else {
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log!("Blob conversion started.");
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let start = now();
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let blob_chunks = Array::new_with_length(container.chunks(65536).len().try_into().unwrap());
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for (i, chunk) in container.chunks(65536).enumerate() {
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let array = Uint8Array::new_with_length(chunk.len().try_into().unwrap());
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array.copy_from(chunk);
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blob_chunks.set(i.try_into().unwrap(), array.dyn_into().unwrap());
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}
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let blob =
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Arc::new(Blob::new_with_u8_array_sequence(blob_chunks.dyn_ref().unwrap()).unwrap());
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log!(format!("Blob conversion completed in {}ms", now() - start));
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let mime_type = tree_magic_mini::from_u8(container);
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if mime_type.starts_with("image/") || mime_type == "application/x-riff" {
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Ok(DecryptedData::Image(blob, container.len()))
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} else if mime_type.starts_with("audio/") {
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Ok(DecryptedData::Audio(blob))
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} else if mime_type.starts_with("video/") || mime_type == "application/x-matroska" {
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Ok(DecryptedData::Video(blob))
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} else {
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Ok(DecryptedData::Blob(blob))
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}
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}
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}
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#[derive(Debug)]
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pub enum PasteCompleteConstructionError {
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StageOneFailure,
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StageTwoFailure,
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}
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impl std::error::Error for PasteCompleteConstructionError {}
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impl Display for PasteCompleteConstructionError {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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match self {
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PasteCompleteConstructionError::StageOneFailure => {
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write!(f, "Failed to decrypt stage one.")
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}
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PasteCompleteConstructionError::StageTwoFailure => {
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write!(f, "Failed to decrypt stage two.")
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}
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}
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}
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}
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