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pict-rs/src/processor.rs

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use crate::{
error::UploadError,
validate::{ptos, Op},
};
use actix_web::web;
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use bytes::Bytes;
use magick_rust::MagickWand;
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use std::{collections::HashSet, path::PathBuf};
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use tracing::{debug, instrument, Span};
pub(crate) trait Processor {
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fn name() -> &'static str
where
Self: Sized;
fn is_processor(s: &str) -> bool
where
Self: Sized;
fn parse(s: &str) -> Option<Box<dyn Processor + Send>>
where
Self: Sized;
fn path(&self, path: PathBuf) -> PathBuf;
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fn process(&self, wand: &mut MagickWand) -> Result<bool, UploadError>;
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fn is_whitelisted(whitelist: Option<&HashSet<String>>) -> bool
where
Self: Sized,
{
whitelist
.map(|wl| wl.contains(Self::name()))
.unwrap_or(true)
}
}
pub(crate) struct Identity;
impl Processor for Identity {
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fn name() -> &'static str
where
Self: Sized,
{
"identity"
}
fn is_processor(s: &str) -> bool
where
Self: Sized,
{
s == Self::name()
}
fn parse(_: &str) -> Option<Box<dyn Processor + Send>>
where
Self: Sized,
{
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debug!("Identity");
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Some(Box::new(Identity))
}
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fn path(&self, path: PathBuf) -> PathBuf {
path
}
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fn process(&self, _: &mut MagickWand) -> Result<bool, UploadError> {
Ok(false)
}
}
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pub(crate) struct Thumbnail(usize);
impl Processor for Thumbnail {
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fn name() -> &'static str
where
Self: Sized,
{
"thumbnail"
}
fn is_processor(s: &str) -> bool
where
Self: Sized,
{
s.starts_with(Self::name())
}
fn parse(s: &str) -> Option<Box<dyn Processor + Send>>
where
Self: Sized,
{
let size = s.trim_start_matches(Self::name()).parse().ok()?;
Some(Box::new(Thumbnail(size)))
}
fn path(&self, mut path: PathBuf) -> PathBuf {
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path.push(Self::name());
path.push(self.0.to_string());
path
}
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fn process(&self, wand: &mut MagickWand) -> Result<bool, UploadError> {
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debug!("Thumbnail");
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let width = wand.get_image_width();
let height = wand.get_image_height();
if width > self.0 || height > self.0 {
wand.fit(self.0, self.0);
Ok(true)
} else if wand.op(|w| w.get_image_format())? == "GIF" {
Ok(true)
} else {
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Ok(false)
}
}
}
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pub(crate) struct Blur(f64);
impl Processor for Blur {
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fn name() -> &'static str
where
Self: Sized,
{
"blur"
}
fn is_processor(s: &str) -> bool {
s.starts_with(Self::name())
}
fn parse(s: &str) -> Option<Box<dyn Processor + Send>> {
let sigma = s.trim_start_matches(Self::name()).parse().ok()?;
Some(Box::new(Blur(sigma)))
}
fn path(&self, mut path: PathBuf) -> PathBuf {
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path.push(Self::name());
path.push(self.0.to_string());
path
}
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fn process(&self, wand: &mut MagickWand) -> Result<bool, UploadError> {
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debug!("Blur");
if self.0 > 0.0 {
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wand.op(|w| w.gaussian_blur_image(0.0, self.0))?;
Ok(true)
} else {
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Ok(false)
}
}
}
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macro_rules! parse {
($x:ident, $y:expr, $z:expr) => {{
if $x::is_processor($y) && $x::is_whitelisted($z) {
return $x::parse($y);
}
}};
}
pub(crate) struct ProcessChain {
inner: Vec<Box<dyn Processor + Send>>,
}
impl std::fmt::Debug for ProcessChain {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
f.debug_struct("ProcessChain")
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.field("steps", &self.inner.len())
.finish()
}
}
#[instrument]
pub(crate) fn build_chain(args: &[String], whitelist: Option<&HashSet<String>>) -> ProcessChain {
let inner = args
.into_iter()
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.filter_map(|arg| {
parse!(Identity, arg.as_str(), whitelist);
parse!(Thumbnail, arg.as_str(), whitelist);
parse!(Blur, arg.as_str(), whitelist);
debug!("Skipping {}, invalid or whitelisted", arg);
None
})
.collect();
ProcessChain { inner }
}
pub(crate) fn build_path(base: PathBuf, chain: &ProcessChain, filename: String) -> PathBuf {
let mut path = chain
.inner
.iter()
.fold(base, |acc, processor| processor.path(acc));
path.push(filename);
path
}
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#[instrument]
pub(crate) async fn process_image(
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original_file: PathBuf,
chain: ProcessChain,
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) -> Result<Option<Bytes>, UploadError> {
let original_path_str = ptos(&original_file)?;
let span = Span::current();
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let opt = web::block(move || {
let entered = span.enter();
let mut wand = MagickWand::new();
debug!("Reading image");
wand.op(|w| w.read_image(&original_path_str))?;
let format = wand.op(|w| w.get_image_format())?;
debug!("Processing image");
let mut changed = false;
for processor in chain.inner.into_iter() {
debug!("Step");
changed |= processor.process(&mut wand)?;
debug!("Step complete");
}
if changed {
let vec = wand.op(|w| w.write_image_blob(&format))?;
return Ok(Some(Bytes::from(vec)));
}
drop(entered);
Ok(None) as Result<Option<Bytes>, UploadError>
})
.await?;
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Ok(opt)
}