fedimovies/src/mastodon_api/uploads.rs

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use std::path::Path;
use crate::errors::HttpError;
use crate::utils::files::{save_file, sniff_media_type};
pub const UPLOAD_MAX_SIZE: usize = 1024 * 1024 * 5;
#[derive(thiserror::Error, Debug)]
pub enum UploadError {
#[error(transparent)]
WriteError(#[from] std::io::Error),
#[error("base64 decoding error")]
Base64DecodingError(#[from] base64::DecodeError),
#[error("file is too large")]
TooLarge,
#[error("invalid media type")]
InvalidMediaType,
}
impl From<UploadError> for HttpError {
fn from(error: UploadError) -> Self {
match error {
UploadError::WriteError(_) => HttpError::InternalError,
other_error => {
HttpError::ValidationError(other_error.to_string())
},
}
}
}
pub fn save_b64_file(
b64data: &str,
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mut maybe_media_type: Option<String>,
output_dir: &Path,
) -> Result<(String, Option<String>), UploadError> {
let data = base64::decode(b64data)?;
if data.len() > UPLOAD_MAX_SIZE {
return Err(UploadError::TooLarge);
};
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if maybe_media_type.as_deref() == Some("image/svg+xml") {
// Don't treat SVG files as images
maybe_media_type = None;
};
Ok(save_file(data, output_dir, maybe_media_type)?)
}
pub fn save_validated_b64_file(
b64data: &str,
output_dir: &Path,
media_type_prefix: &str,
) -> Result<(String, String), UploadError> {
let data = base64::decode(b64data)?;
if data.len() > UPLOAD_MAX_SIZE {
return Err(UploadError::TooLarge);
};
let media_type = sniff_media_type(&data)
.ok_or(UploadError::InvalidMediaType)?;
if !media_type.starts_with(media_type_prefix) {
return Err(UploadError::InvalidMediaType);
};
let (file_name, _) =
save_file(data, output_dir, Some(media_type.clone()))?;
Ok((file_name, media_type))
}