fedimovies/src/media.rs

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use std::fs::remove_file;
use std::io::Error;
use std::path::{Path, PathBuf};
use sha2::{Digest, Sha256};
use mitra_config::Config;
use mitra_models::cleanup::DeletionQueue;
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use mitra_utils::files::{get_media_type_extension, write_file};
use crate::ipfs::store as ipfs_store;
pub const SUPPORTED_MEDIA_TYPES: [&str; 11] = [
"audio/mpeg",
"audio/ogg",
"audio/x-wav",
"image/apng",
"image/gif",
"image/jpeg",
"image/png",
"image/webp",
"video/mp4",
"video/ogg",
"video/webm",
];
/// Generates unique file name based on file contents
fn get_file_name(data: &[u8], media_type: Option<&str>) -> String {
let digest = Sha256::digest(data);
let mut file_name = hex::encode(digest);
let maybe_extension = media_type
.and_then(get_media_type_extension);
if let Some(extension) = maybe_extension {
// Append extension for known media types
file_name = format!("{}.{}", file_name, extension);
};
file_name
}
/// Save validated file to specified directory
pub fn save_file(
data: Vec<u8>,
output_dir: &Path,
media_type: Option<&str>,
) -> Result<String, Error> {
let file_name = get_file_name(&data, media_type);
let file_path = output_dir.join(&file_name);
write_file(&data, &file_path)?;
Ok(file_name)
}
pub fn get_file_url(instance_url: &str, file_name: &str) -> String {
format!("{}/media/{}", instance_url, file_name)
}
pub fn remove_files(files: Vec<String>, from_dir: &Path) -> () {
for file_name in files {
let file_path = from_dir.join(file_name);
let file_path_str = file_path.to_string_lossy();
match remove_file(&file_path) {
Ok(_) => log::info!("removed file {}", file_path_str),
Err(err) => {
log::warn!("failed to remove file {} ({})", file_path_str, err);
},
};
};
}
pub async fn remove_media(
config: &Config,
queue: DeletionQueue,
) -> () {
remove_files(queue.files, &config.media_dir());
if !queue.ipfs_objects.is_empty() {
match &config.ipfs_api_url {
Some(ipfs_api_url) => {
ipfs_store::remove(ipfs_api_url, queue.ipfs_objects).await
.unwrap_or_else(|err| log::error!("{}", err));
},
None => {
log::error!(
"can not remove objects because IPFS API URL is not set: {:?}",
queue.ipfs_objects,
);
},
}
}
}
pub struct MediaStorage {
pub media_dir: PathBuf,
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pub file_size_limit: usize,
pub emoji_size_limit: usize,
}
impl From<&Config> for MediaStorage {
fn from(config: &Config) -> Self {
Self {
media_dir: config.media_dir(),
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file_size_limit: config.limits.media.file_size_limit,
emoji_size_limit: config.limits.media.emoji_size_limit,
}
}
}
#[cfg(test)]
mod tests {
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use mitra_utils::files::sniff_media_type;
use super::*;
#[test]
fn test_get_file_name() {
let mut data = vec![];
data.extend_from_slice(b"\x89PNG\x0D\x0A\x1A\x0A");
let media_type = sniff_media_type(&data);
let file_name = get_file_name(&data, media_type.as_deref());
assert_eq!(
file_name,
"4c4b6a3be1314ab86138bef4314dde022e600960d8689a2c8f8631802d20dab6.png",
);
}
}