Add release document for 0.5.7, add blurhash endpoint to readme

.forgejo/workflows/publish.yaml

@@ -208,7 +208,6 @@ jobs:
           direction: upload
           token: ${{ secrets.GITHUB_TOKEN }}
           release-dir: artifacts/
-          prerelease: true
 
   publish-crate:
     needs: [build]

README.md

@@ -380,6 +380,22 @@ pict-rs offers the following endpoints:
         These proxied images are removed from pict-rs some time after their last access. This time
         is configurable with `PICTRS__MEDIA__RETENTION__PROXY`. See (./pict-rs.toml)[./pict-rs.toml]
         for more information.
+- `GET /image/blurhash?alias={alias}` Create and store a blurhash for the provided alias
+
+    Available source arguments are
+    - `?alias={alias}` Serve a blurhash for an image identified by the provided alias
+    - `?proxy={url}` Serve a blurhash for the media hosted at `url`
+        This will download and store the original version of the specified media, as well as its
+        blurhash. Retention for proxied media is configurable with `PICTRS__MEDIA__RETENTION__PROXY`.
+        See (./pict-rs.toml)[./pict-rs.toml] for more information.
+
+    The returned JSON is structured like so:
+    ```json
+    {
+        "msg": "ok",
+        "blurhash": "LGF5]+Yk^6#M@-5c,1J5@[or[Q6."
+    }
+    ```
 - `GET /image/process.{ext}?src={alias}&...` Get a file with transformations applied.
     Available source arguments are
     - `?src={alias}` This behavior is the same as in previous releases

releases/0.5.7.md

@@ -0,0 +1,93 @@
+# pict-rs 0.5.7
+
+## Overview
+
+pict-rs 0.5.7 adds support for generating blurhashes from images and includes a couple unrelated
+fixes and tweaks. 
+
+### Features
+
+- [Blurhash Endpoint](#blurhash-endpoint)
+
+
+### Changes
+
+- [File Path Changes](#file-path-changes)
+- [Performance Improvements](#performance-improvements)
+
+
+### Fixes
+
+- [More Consistent Errors](#more-consistent-errors)
+- [APNG Detection](#apng-detection)
+
+
+## Upgrade Notes
+
+There is a small repo format migration between 0.5.6 and 0.5.7. For sled it's simply opening a new
+tree, for postgres it involves adding a new column to the hashes table. These changes will
+automatically apply when launching pict-rs 0.5.7. Upgrading should be as simple as pulling a new
+version of pict-rs.
+
+
+## Descriptions
+
+### Blurhash Endpoint
+
+A new endpoint at `/image/blurhash` has been added for generating blurhashes from uploaded media. A
+blurhash is a short string that encodes a few notable color values from an image that can be
+reconstructed into a blurred approximation of the original image. Notably, blurhashes are used by
+Mastodon to act as placeholders for sensitive media. For more information about blurhashes, see
+[blurha.sh](https://blurha.sh).
+
+This endpoint is powered by my new blurhash encoding library,
+[blurhash-update](https://crates.io/crates/blurhash-update).
+
+On success, the blurhash endpoint returns the following JSON.
+
+```json
+{
+    "msg": "ok",
+    "blurhash": "LGF5]+Yk^6#M@-5c,1J5@[or[Q6."
+}
+```
+
+pict-rs does not provide a blurhash decoding mechanism (it would defeat the purpose of blurhashes to
+do so).
+
+
+### File Path Changes
+
+pict-rs has dropped its dependency on my `storage-path-generator` library in favor of using UUIDs to
+create unique file paths for uploaded media. This means that newly uploaded media will be stored in
+a different directory structure, and with different filenames. The purpose of this is to reduce
+database use by removing the need to synchronize the current path state.
+
+pict-rs 0.5.7 also adds file extensions back to file paths, since they are now somewhat-publicly
+visible (when using the public_endpoint configuration with object storage).
+
+Neither of these changes affect previously uploaded media.
+
+
+### Performance Improvements
+
+pict-rs 0.5.7 now buffers media in memory less frequently, opting to stream bytes directly from
+sources to sinks. This should improve general memory use, as well as decrease time pict-rs would
+spend waiting to aggregate bytes.
+
+pict-rs also no longer requires bytes be present in contiguous buffers, avoiding large allocations
+and reducing memcpys.
+
+
+### More Consistent Errors
+
+pict-rs 0.5 introduced machine-readable error codes that returned alongside error messages, but
+there were a couple locations in pict-rs that failed to include them. pict-rs 0.5.7 resolves this,
+ensuring all error paths properly return codes.
+
+
+### APNG Detection
+
+pict-rs 0.5.7 fixes the imagemagick delegate policy for ffmpeg, which allows for properly detecting
+certain media, notably APNG files. pict-rs should once again be able to properly handle uploaded
+APNGs.