4 files changed, 42 insertions, 3 deletions
diff --git a/dichroism/Cargo.lock b/dichroism/Cargo.lock
index 1fe4b81..f08e9a4 100644
--- a/dichroism/Cargo.lock
+++ b/dichroism/Cargo.lock
@@ -761,6 +761,7 @@ dependencies = [
  "env_logger",
  "futures",
  "image",
+ "kamadak-exif",
  "listenfd",
  "log",
  "mime",
@@ -1246,6 +1247,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "kamadak-exif"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524f22a6373f7d4f4e7caa44d54efbaf1e92c09d41f38647db2784ebce610aa8"
+dependencies = [
+ "mutate_once",
+]
+
+[[package]]
 name = "kernel32-sys"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1449,6 +1459,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "mutate_once"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16cf681a23b4d0a43fc35024c176437f9dcd818db34e0f42ab456a0ee5ad497b"
+
+[[package]]
 name = "nb-connect"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/dichroism/Cargo.toml b/dichroism/Cargo.toml
index 22b8a42..bacd843 100644
--- a/dichroism/Cargo.toml
+++ b/dichroism/Cargo.toml
@@ -14,6 +14,7 @@ diesel = { version = "1", features = [ "sqlite", "r2d2" ] }
 env_logger = "0.8"
 futures = "0.3"
 image = "0.23"
+kamadak-exif = "0.5.2"
 listenfd = "0.3"
 log = "0.4"
 mime = "0.3"
diff --git a/dichroism/src/handlers.rs b/dichroism/src/handlers.rs
index 8dd0f3b..b9420af 100644
--- a/dichroism/src/handlers.rs
+++ b/dichroism/src/handlers.rs
@@ -117,7 +117,7 @@ async fn post_photo(
         }
 
         // create new photo_set
-        let photo_set = web::block(move || image_service::generate_photo_set(&data))
+        let photo_set = web::block(move || image_service::generate_photo_set(data))
             .await
             .map_err(to_internal_error)?;
         let conn = pool.get().map_err(to_internal_error)?;
diff --git a/dichroism/src/image_service.rs b/dichroism/src/image_service.rs
index a69cca2..0d2ed14 100644
--- a/dichroism/src/image_service.rs
+++ b/dichroism/src/image_service.rs
@@ -2,14 +2,36 @@ use crate::config::CONFIG_INSTANCE;
 use crate::constants::{PHOTO_BASE_XY, PHOTO_FULLSIZE_XY, PHOTO_THUMBNAIL_XY};
 use crate::error::DichroismError;
 use crate::models::{Photo, PhotoSet};
+use exif::Reader;
 use image::imageops::FilterType;
 use image::DynamicImage;
 use image::GenericImageView;
+use std::io::{BufReader, Cursor};
 use std::path::PathBuf;
 use uuid::Uuid;
 
-pub fn generate_photo_set(data: &[u8]) -> Result<PhotoSet, DichroismError> {
-    let original = image::load_from_memory(&data)?;
+pub fn generate_photo_set(data: Vec<u8>) -> Result<PhotoSet, DichroismError> {
+    // load image data from bytes
+    let mut original = image::load_from_memory(&data)?;
+
+    // read EXIF tags to check for required rotation
+    let exifreader = Reader::new();
+    let mut reader = BufReader::new(Cursor::new(data));
+    let exif = exifreader.read_from_container(&mut reader).unwrap();
+    if let Some(orient) = exif
+        .get_field(exif::Tag::Orientation, exif::In::PRIMARY)
+        .map(|o| o.value.get_uint(0))
+        .flatten()
+    {
+        // if a tag was present, rotate original image data as necessary
+        match orient {
+            8 => original = original.rotate270(),
+            3 => original = original.rotate180(),
+            6 => original = original.rotate90(),
+            _ => {}
+        }
+    }
+
     let fullsize = original.resize(PHOTO_FULLSIZE_XY, PHOTO_FULLSIZE_XY, FilterType::Lanczos3);
     let base = original.resize(PHOTO_BASE_XY, PHOTO_BASE_XY, FilterType::Lanczos3);