WIP: Try to pass AsyncRead types around instead of Streams

Cargo.lock

@@ -1019,6 +1019,7 @@ dependencies = [
  "time 0.3.2",
  "tokio",
  "tokio-stream",
+ "tokio-util",
  "tracing",
  "tracing-futures",
  "tracing-subscriber",

Cargo.toml

@@ -31,8 +31,9 @@ sled = { version = "0.34.6" }
 structopt = "0.3.14"
 thiserror = "1.0"
 time = { version = "0.3.0", features = ["serde"] }
-tokio = { version = "1", default-features = false, features = ["io-util", "macros", "process", "sync"] }
+tokio = { version = "1", default-features = false, features = ["fs", "io-util", "macros", "process", "sync"] }
 tokio-stream = { version = "0.1", default-features = false }
+tokio-util = { version = "0.6", default-features = false, features = ["codec"] }
 tracing = "0.1.15"
 tracing-futures = "0.2.4"
 tracing-subscriber = { version = "0.2.5", features = ["fmt", "tracing-log"] }

src/exiftool.rs

@@ -1,3 +1,21 @@
+use crate::stream::Process;
+use actix_web::web::Bytes;
+use tokio::{io::AsyncRead, process::Command};
+
+pub(crate) fn clear_metadata_bytes_read(input: Bytes) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("exiftool").args(["-all=", "-", "-out", "-"]))?;
+
+    Ok(process.bytes_read(input).unwrap())
+}
+
+pub(crate) fn clear_metadata_write_read(
+    input: impl AsyncRead + Unpin + 'static,
+) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("exiftool").args(["-all=", "-", "-out", "-"]))?;
+
+    Ok(process.write_read(input).unwrap())
+}
+
 pub(crate) fn clear_metadata_stream<S, E>(
     input: S,
 ) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<actix_web::web::Bytes, E>>>
@@ -5,9 +23,7 @@ where
     S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E>> + Unpin + 'static,
     E: From<std::io::Error> + 'static,
 {
-    let process = crate::stream::Process::spawn(
-        tokio::process::Command::new("exiftool").args(["-all=", "-", "-out", "-"]),
-    )?;
+    let process = Process::spawn(Command::new("exiftool").args(["-all=", "-", "-out", "-"]))?;
 
     Ok(Box::pin(process.sink_stream(input).unwrap()))
 }

src/ffmpeg.rs

@@ -1,3 +1,7 @@
+use crate::stream::Process;
+use actix_web::web::Bytes;
+use tokio::{io::AsyncRead, process::Command};
+
 #[derive(Debug, thiserror::Error)]
 pub(crate) enum VideoError {
     #[error("Failed to interface with transcode process")]
@@ -53,15 +57,67 @@ fn semaphore() -> &'static tokio::sync::Semaphore {
         .get_or_init(|| tokio::sync::Semaphore::new(num_cpus::get().saturating_sub(1).max(1)))
 }
 
+pub(crate) fn to_mp4_bytes(
+    input: Bytes,
+    input_format: InputFormat,
+) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("ffmpeg").args([
+        "-f",
+        input_format.as_format(),
+        "-i",
+        "pipe:",
+        "-movflags",
+        "faststart+frag_keyframe+empty_moov",
+        "-pix_fmt",
+        "yuv420p",
+        "-vf",
+        "scale=trunc(iw/2)*2:trunc(ih/2)*2",
+        "-an",
+        "-codec",
+        "h264",
+        "-f",
+        "mp4",
+        "pipe:",
+    ]))?;
+
+    Ok(process.bytes_read(input).unwrap())
+}
+
+pub(crate) fn to_mp4_write_read(
+    input: impl AsyncRead + Unpin + 'static,
+    input_format: InputFormat,
+) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("ffmpeg").args([
+        "-f",
+        input_format.as_format(),
+        "-i",
+        "pipe:",
+        "-movflags",
+        "faststart+frag_keyframe+empty_moov",
+        "-pix_fmt",
+        "yuv420p",
+        "-vf",
+        "scale=trunc(iw/2)*2:trunc(ih/2)*2",
+        "-an",
+        "-codec",
+        "h264",
+        "-f",
+        "mp4",
+        "pipe:",
+    ]))?;
+
+    Ok(process.write_read(input).unwrap())
+}
+
 pub(crate) fn to_mp4_stream<S, E>(
     input: S,
     input_format: InputFormat,
-) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<actix_web::web::Bytes, E>>>
+) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<Bytes, E>>>
 where
-    S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E>> + Unpin + 'static,
+    S: futures::stream::Stream<Item = Result<Bytes, E>> + Unpin + 'static,
     E: From<std::io::Error> + 'static,
 {
-    let process = crate::stream::Process::spawn(tokio::process::Command::new("ffmpeg").args([
+    let process = Process::spawn(Command::new("ffmpeg").args([
         "-f",
         input_format.as_format(),
         "-i",
@@ -94,7 +150,7 @@ where
 {
     let permit = semaphore().acquire().await?;
 
-    let mut child = tokio::process::Command::new("ffmpeg")
+    let mut child = Command::new("ffmpeg")
         .arg(&"-i")
         .arg(&from.as_ref())
         .args([

src/magick.rs

@@ -1,3 +1,11 @@
+use crate::{config::Format, stream::Process};
+use actix_web::web::Bytes;
+use std::process::Stdio;
+use tokio::{
+    io::{AsyncRead, AsyncReadExt, AsyncWriteExt},
+    process::Command,
+};
+
 #[derive(Debug, thiserror::Error)]
 pub(crate) enum MagickError {
     #[error("{0}")]
@@ -32,29 +40,88 @@ fn semaphore() -> &'static tokio::sync::Semaphore {
         .get_or_init(|| tokio::sync::Semaphore::new(num_cpus::get().saturating_sub(1).max(1)))
 }
 
+pub(crate) fn clear_metadata_bytes_read(input: Bytes) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("magick").args(["convert", "-", "-strip", "-"]))?;
+
+    Ok(process.bytes_read(input).unwrap())
+}
+
+pub(crate) fn clear_metadata_write_read(
+    input: impl AsyncRead + Unpin + 'static,
+) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("magick").args(["convert", "-", "-strip", "-"]))?;
+
+    Ok(process.write_read(input).unwrap())
+}
+
+pub(crate) async fn details_write_read(
+    input: impl AsyncRead + Unpin + 'static,
+) -> Result<Details, MagickError> {
+    let process = Process::spawn(Command::new("magick").args([
+        "identify",
+        "-ping",
+        "-format",
+        "%w %h | %m\n",
+        "-",
+    ]))?;
+
+    let mut reader = process.write_read(input).unwrap();
+
+    let mut bytes = Vec::new();
+
+    reader.read_to_end(&mut bytes).await?;
+
+    let s = String::from_utf8_lossy(&bytes);
+    parse_details(s)
+}
+
+pub(crate) fn convert_write_read(
+    input: impl AsyncRead + Unpin + 'static,
+    format: Format,
+) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("magick").args([
+        "convert",
+        "-",
+        format!("{}:-", format.to_magick_format()).as_str(),
+    ]))?;
+
+    Ok(process.write_read(input).unwrap())
+}
+
 pub(crate) fn clear_metadata_stream<S, E>(
     input: S,
-) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<actix_web::web::Bytes, E>>>
+) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<Bytes, E>>>
 where
-    S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E>> + Unpin + 'static,
+    S: futures::stream::Stream<Item = Result<Bytes, E>> + Unpin + 'static,
     E: From<std::io::Error> + 'static,
 {
-    let process = crate::stream::Process::spawn(
-        tokio::process::Command::new("magick").args(["convert", "-", "-strip", "-"]),
-    )?;
+    let process = Process::spawn(Command::new("magick").args(["convert", "-", "-strip", "-"]))?;
 
     Ok(Box::pin(process.sink_stream(input).unwrap()))
 }
 
+pub(crate) fn convert_bytes_read(
+    input: Bytes,
+    format: Format,
+) -> std::io::Result<impl AsyncRead + Unpin> {
+    let process = Process::spawn(Command::new("magick").args([
+        "convert",
+        "-",
+        format!("{}:-", format.to_magick_format()).as_str(),
+    ]))?;
+
+    Ok(process.bytes_read(input).unwrap())
+}
+
 pub(crate) fn convert_stream<S, E>(
     input: S,
-    format: crate::config::Format,
-) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<actix_web::web::Bytes, E>>>
+    format: Format,
+) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<Bytes, E>>>
 where
-    S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E>> + Unpin + 'static,
+    S: futures::stream::Stream<Item = Result<Bytes, E>> + Unpin + 'static,
     E: From<std::io::Error> + 'static,
 {
-    let process = crate::stream::Process::spawn(tokio::process::Command::new("magick").args([
+    let process = Process::spawn(Command::new("magick").args([
         "convert",
         "-",
         format!("{}:-", format.to_magick_format()).as_str(),
@@ -65,7 +132,7 @@ where
 
 pub(crate) async fn details_stream<S, E1, E2>(input: S) -> Result<Details, E2>
 where
-    S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E1>> + Unpin,
+    S: futures::stream::Stream<Item = Result<Bytes, E1>> + Unpin,
     E1: From<std::io::Error>,
     E2: From<E1> + From<std::io::Error> + From<MagickError>,
 {
@@ -73,8 +140,7 @@ where
 
     let permit = semaphore().acquire().await.map_err(MagickError::from)?;
 
-    let mut process =
-        crate::stream::Process::spawn(tokio::process::Command::new("magick").args([
+    let mut process = Process::spawn(Command::new("magick").args([
         "identify",
         "-ping",
         "-format",
@@ -103,7 +169,7 @@ where
 {
     let permit = semaphore().acquire().await?;
 
-    let output = tokio::process::Command::new("magick")
+    let output = Command::new("magick")
         .args([&"identify", &"-ping", &"-format", &"%w %h | %m\n"])
         .arg(&file.as_ref())
         .output()
@@ -159,9 +225,34 @@ fn parse_details(s: std::borrow::Cow<'_, str>) -> Result<Details, MagickError> {
     })
 }
 
+pub(crate) async fn input_type_bytes(mut input: Bytes) -> Result<ValidInputType, MagickError> {
+    let permit = semaphore().acquire().await.map_err(MagickError::from)?;
+
+    let mut child = Command::new("magick")
+        .args(["identify", "-ping", "-format", "%m\n", "-"])
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .spawn()?;
+
+    let mut stdin = child.stdin.take().unwrap();
+    let mut stdout = child.stdout.take().unwrap();
+
+    stdin.write_all_buf(&mut input).await?;
+
+    let mut vec = Vec::new();
+    stdout.read_to_end(&mut vec).await?;
+
+    drop(stdin);
+    child.wait().await?;
+    drop(permit);
+
+    let s = String::from_utf8_lossy(&vec);
+    parse_input_type(s)
+}
+
 pub(crate) async fn input_type_stream<S, E1, E2>(input: S) -> Result<ValidInputType, E2>
 where
-    S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E1>> + Unpin,
+    S: futures::stream::Stream<Item = Result<Bytes, E1>> + Unpin,
     E1: From<std::io::Error>,
     E2: From<E1> + From<std::io::Error> + From<MagickError>,
 {
@@ -169,9 +260,8 @@ where
 
     let permit = semaphore().acquire().await.map_err(MagickError::from)?;
 
-    let mut process = crate::stream::Process::spawn(
-        tokio::process::Command::new("magick").args(["identify", "-ping", "-format", "%m\n", "-"]),
-    )?;
+    let mut process =
+        Process::spawn(Command::new("magick").args(["identify", "-ping", "-format", "%m\n", "-"]))?;
 
     process.take_sink().unwrap().send(input).await?;
     let mut stream = process.take_stream().unwrap();
@@ -211,14 +301,14 @@ fn parse_input_type(s: std::borrow::Cow<'_, str>) -> Result<ValidInputType, Magi
 pub(crate) fn process_image_stream<S, E>(
     input: S,
     args: Vec<String>,
-    format: crate::config::Format,
-) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<actix_web::web::Bytes, E>>>
+    format: Format,
+) -> std::io::Result<futures::stream::LocalBoxStream<'static, Result<Bytes, E>>>
 where
-    S: futures::stream::Stream<Item = Result<actix_web::web::Bytes, E>> + Unpin + 'static,
+    S: futures::stream::Stream<Item = Result<Bytes, E>> + Unpin + 'static,
     E: From<std::io::Error> + 'static,
 {
-    let process = crate::stream::Process::spawn(
-        tokio::process::Command::new("magick")
+    let process = Process::spawn(
+        Command::new("magick")
             .args([&"convert", &"-"])
             .args(args)
             .arg(format!("{}:-", format.to_magick_format())),

src/stream.rs

@@ -1,15 +1,27 @@
 use actix_web::web::Bytes;
 use futures::stream::{LocalBoxStream, Stream, StreamExt};
 use std::{
+    future::Future,
     pin::Pin,
     task::{Context, Poll},
 };
-use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::io::{AsyncRead, AsyncReadExt, AsyncWriteExt, ReadBuf};
+use tokio_stream::wrappers::ReceiverStream;
+
+pub(crate) struct ReadAdapter<S> {
+    inner: S,
+}
 
 pub(crate) struct Process {
     child: tokio::process::Child,
 }
 
+pub(crate) struct ProcessRead<I> {
+    inner: I,
+    err_recv: tokio::sync::oneshot::Receiver<std::io::Error>,
+    err_closed: bool,
+}
+
 pub(crate) struct ProcessSink {
     stdin: tokio::process::ChildStdin,
 }
@@ -23,7 +35,44 @@ pub(crate) struct ProcessSinkStream<E> {
 }
 
 pub(crate) struct TryDuplicateStream<T, E> {
-    inner: tokio_stream::wrappers::ReceiverStream<Result<T, E>>,
+    inner: ReceiverStream<Result<T, E>>,
+}
+
+#[derive(Debug)]
+pub(crate) struct StringError(String);
+
+impl<S> ReadAdapter<S> {
+    pub(crate) fn new_unsync<E>(
+        mut stream: S,
+    ) -> ReadAdapter<ReceiverStream<Result<Bytes, StringError>>>
+    where
+        S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
+        E: std::fmt::Display,
+    {
+        let (tx, rx) = tokio::sync::mpsc::channel(1);
+
+        actix_rt::spawn(async move {
+            while let Some(res) = stream.next().await {
+                if tx
+                    .send(res.map_err(|e| StringError(e.to_string())))
+                    .await
+                    .is_err()
+                {
+                    break;
+                }
+            }
+        });
+
+        ReadAdapter::new_sync(ReceiverStream::new(rx))
+    }
+
+    fn new_sync<E>(stream: S) -> Self
+    where
+        S: Stream<Item = Result<Bytes, E>> + Unpin,
+        E: Into<Box<dyn std::error::Error + Send + Sync>>,
+    {
+        ReadAdapter { inner: stream }
+    }
 }
 
 impl Process {
@@ -46,6 +95,47 @@ impl Process {
         self.child.stdout.take().map(ProcessStream::new)
     }
 
+    pub(crate) fn bytes_read(mut self, mut input: Bytes) -> Option<impl AsyncRead + Unpin> {
+        let mut stdin = self.child.stdin.take()?;
+        let stdout = self.child.stdout.take()?;
+
+        let (tx, rx) = tokio::sync::oneshot::channel();
+
+        actix_rt::spawn(async move {
+            if let Err(e) = stdin.write_all_buf(&mut input).await {
+                let _ = tx.send(e);
+            }
+        });
+
+        Some(Box::pin(ProcessRead {
+            inner: stdout,
+            err_recv: rx,
+            err_closed: false,
+        }))
+    }
+
+    pub(crate) fn write_read(
+        mut self,
+        mut input_reader: impl AsyncRead + Unpin + 'static,
+    ) -> Option<impl AsyncRead + Unpin> {
+        let mut stdin = self.child.stdin.take()?;
+        let stdout = self.child.stdout.take()?;
+
+        let (tx, rx) = tokio::sync::oneshot::channel();
+
+        actix_rt::spawn(async move {
+            if let Err(e) = tokio::io::copy(&mut input_reader, &mut stdin).await {
+                let _ = tx.send(e);
+            }
+        });
+
+        Some(Box::pin(ProcessRead {
+            inner: stdout,
+            err_recv: rx,
+            err_closed: false,
+        }))
+    }
+
     pub(crate) fn sink_stream<S, E>(mut self, input_stream: S) -> Option<ProcessSinkStream<E>>
     where
         S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
@@ -167,11 +257,61 @@ where
     (
         s,
         TryDuplicateStream {
-            inner: tokio_stream::wrappers::ReceiverStream::new(rx),
+            inner: ReceiverStream::new(rx),
         },
     )
 }
 
+impl<S, E> AsyncRead for ReadAdapter<S>
+where
+    S: Stream<Item = Result<Bytes, E>> + Unpin,
+    E: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<std::io::Result<()>> {
+        match Pin::new(&mut self.inner).poll_next(cx) {
+            Poll::Ready(Some(Ok(bytes))) => {
+                buf.put_slice(&bytes);
+                Poll::Ready(Ok(()))
+            }
+            Poll::Ready(None) => Poll::Ready(Ok(())),
+            Poll::Ready(Some(Err(e))) => {
+                Poll::Ready(Err(std::io::Error::new(std::io::ErrorKind::Other, e)))
+            }
+            Poll::Pending => Poll::Pending,
+        }
+    }
+}
+
+impl<I> AsyncRead for ProcessRead<I>
+where
+    I: AsyncRead + Unpin,
+{
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<std::io::Result<()>> {
+        if !self.err_closed {
+            if let Poll::Ready(res) = Pin::new(&mut self.err_recv).poll(cx) {
+                self.err_closed = true;
+                if let Ok(err) = res {
+                    return Poll::Ready(Err(err));
+                }
+            }
+        }
+
+        if let Poll::Ready(res) = Pin::new(&mut self.inner).poll_read(cx, buf) {
+            return Poll::Ready(res);
+        }
+
+        Poll::Pending
+    }
+}
+
 impl Stream for ProcessStream {
     type Item = std::io::Result<Bytes>;
 
@@ -195,3 +335,11 @@ impl<T, E> Stream for TryDuplicateStream<T, E> {
         Pin::new(&mut self.inner).poll_next(cx)
     }
 }
+
+impl std::fmt::Display for StringError {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl std::error::Error for StringError {}

src/upload_manager.rs

@@ -7,7 +7,13 @@ use crate::{
 use actix_web::web;
 use futures::stream::{Stream, StreamExt, TryStreamExt};
 use sha2::Digest;
-use std::{path::PathBuf, pin::Pin, sync::Arc};
+use std::{
+    path::PathBuf,
+    pin::Pin,
+    sync::Arc,
+    task::{Context, Poll},
+};
+use tokio::io::{AsyncRead, ReadBuf};
 use tracing::{debug, error, info, instrument, warn, Span};
 
 // TREE STRUCTURE
@@ -27,6 +33,38 @@ pub struct UploadManager {
     inner: Arc<UploadManagerInner>,
 }
 
+pub struct Hasher<I> {
+    inner: I,
+    hasher: sha2::Sha256,
+}
+
+impl<I> Hasher<I> {
+    async fn finalize_reset(self) -> Result<Hash, UploadError> {
+        let mut hasher = self.hasher;
+        let hash = web::block(move || Hash::new(hasher.finalize_reset().to_vec())).await?;
+        Ok(hash)
+    }
+}
+
+impl<I> AsyncRead for Hasher<I>
+where
+    I: AsyncRead + Unpin,
+{
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<std::io::Result<()>> {
+        let before_len = buf.filled().len();
+        let poll_res = Pin::new(&mut self.inner).poll_read(cx, buf);
+        let after_len = buf.filled().len();
+        if after_len > before_len {
+            self.hasher.update(&buf.filled()[before_len..after_len]);
+        }
+        poll_res
+    }
+}
+
 struct UploadManagerInner {
     format: Option<Format>,
     hasher: sha2::Sha256,
@@ -111,6 +149,18 @@ impl Details {
         ))
     }
 
+    pub(crate) async fn from_async_read(
+        input: impl AsyncRead + Unpin + 'static,
+    ) -> Result<Self, UploadError> {
+        let details = crate::magick::details_write_read(input).await?;
+
+        Ok(Details::now(
+            details.width,
+            details.height,
+            details.mime_type,
+        ))
+    }
+
     pub(crate) async fn from_path<P>(path: P) -> Result<Self, UploadError>
     where
         P: AsRef<std::path::Path>,
@@ -535,27 +585,28 @@ impl UploadManager {
     pub(crate) async fn upload<E>(&self, mut stream: UploadStream<E>) -> Result<String, UploadError>
     where
         UploadError: From<E>,
-        E: Unpin + 'static,
     {
-        let mapped_err_stream = Box::pin(async_stream::stream! {
-            use futures::stream::StreamExt;
+        let mut bytes_mut = actix_web::web::BytesMut::new();
 
+        debug!("Reading stream to memory");
         while let Some(res) = stream.next().await {
-                yield res.map_err(UploadError::from);
+            let bytes = res?;
+            bytes_mut.extend_from_slice(&bytes);
         }
-        });
 
-        let (content_type, validated_stream) =
-            crate::validate::validate_image_stream(mapped_err_stream, self.inner.format.clone())
+        debug!("Validating bytes");
+        let (content_type, validated_reader) =
+            crate::validate::validate_image_bytes(bytes_mut.freeze(), self.inner.format.clone())
                 .await?;
 
-        let (s1, s2) = crate::stream::try_duplicate(validated_stream, 1024);
+        let mut hasher_reader = Hasher {
+            inner: validated_reader,
+            hasher: self.inner.hasher.clone(),
+        };
 
         let tmpfile = crate::tmp_file();
-        let (hash, _) = tokio::try_join!(
-            self.hash_stream::<_, UploadError>(Box::pin(s1)),
-            safe_save_stream::<UploadError>(tmpfile.clone(), Box::pin(s2))
-        )?;
+        safe_save_reader(tmpfile.clone(), &mut hasher_reader).await?;
+        let hash = hasher_reader.finalize_reset().await?;
 
         debug!("Adding alias");
         let alias = self.add_alias(&hash, content_type.clone()).await?;
@@ -880,6 +931,34 @@ impl UploadManager {
     }
 }
 
+#[instrument(skip(input))]
+pub(crate) async fn safe_save_reader(
+    to: PathBuf,
+    input: &mut (impl AsyncRead + Unpin),
+) -> Result<(), UploadError> {
+    if let Some(path) = to.parent() {
+        debug!("Creating directory {:?}", path);
+        actix_fs::create_dir_all(path.to_owned()).await?;
+    }
+
+    debug!("Checking if {:?} already exists", to);
+    if let Err(e) = actix_fs::metadata(to.clone()).await {
+        if e.kind() != Some(std::io::ErrorKind::NotFound) {
+            return Err(e.into());
+        }
+    } else {
+        return Err(UploadError::FileExists);
+    }
+
+    debug!("Writing stream to {:?}", to);
+
+    let mut file = tokio::fs::File::create(to).await?;
+
+    tokio::io::copy(input, &mut file).await?;
+
+    Ok(())
+}
+
 #[instrument(skip(stream))]
 pub(crate) async fn safe_save_stream<E>(
     to: PathBuf,

src/validate.rs

@@ -1,4 +1,6 @@
 use crate::{config::Format, error::UploadError, ffmpeg::InputFormat, magick::ValidInputType};
+use actix_web::web::Bytes;
+use tokio::io::AsyncRead;
 
 pub(crate) fn image_webp() -> mime::Mime {
     "image/webp".parse().unwrap()
@@ -8,6 +10,40 @@ pub(crate) fn video_mp4() -> mime::Mime {
     "video/mp4".parse().unwrap()
 }
 
+pub(crate) async fn validate_image_bytes(
+    bytes: Bytes,
+    prescribed_format: Option<Format>,
+) -> Result<(mime::Mime, Box<dyn AsyncRead + Unpin>), UploadError> {
+    let input_type = crate::magick::input_type_bytes(bytes.clone()).await?;
+
+    match (prescribed_format, input_type) {
+        (_, ValidInputType::Gif) => Ok((
+            video_mp4(),
+            Box::new(crate::ffmpeg::to_mp4_bytes(bytes, InputFormat::Gif)?),
+        )),
+        (_, ValidInputType::Mp4) => Ok((
+            video_mp4(),
+            Box::new(crate::ffmpeg::to_mp4_bytes(bytes, InputFormat::Gif)?),
+        )),
+        (Some(Format::Jpeg) | None, ValidInputType::Jpeg) => Ok((
+            mime::IMAGE_JPEG,
+            Box::new(crate::exiftool::clear_metadata_bytes_read(bytes)?),
+        )),
+        (Some(Format::Png) | None, ValidInputType::Png) => Ok((
+            mime::IMAGE_PNG,
+            Box::new(crate::exiftool::clear_metadata_bytes_read(bytes)?),
+        )),
+        (Some(Format::Webp) | None, ValidInputType::Webp) => Ok((
+            image_webp(),
+            Box::new(crate::magick::clear_metadata_bytes_read(bytes)?),
+        )),
+        (Some(format), _) => Ok((
+            format.to_mime(),
+            Box::new(crate::magick::convert_bytes_read(bytes, format)?),
+        )),
+    }
+}
+
 pub(crate) async fn validate_image_stream<S>(
     stream: S,
     prescribed_format: Option<Format>,