new hook: exif stripper

bin/hooks/image-noexif.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import subprocess as sp
+
+
+_ = r"""
+remove exif tags from uploaded images; the eventhook edition of
+https://github.com/9001/copyparty/blob/hovudstraum/bin/mtag/image-noexif.py
+
+dependencies:
+    exiftool / perl-Image-ExifTool
+
+being an upload hook, this will take effect after upload completion
+    but before copyparty has hashed/indexed the file, which means that
+    copyparty will never index the original file, so deduplication will
+    not work as expected... which is mostly OK but ehhh
+
+note: modifies the file in-place, so don't set the `f` (fork) flag
+
+example usages; either as global config (all volumes) or as volflag:
+    --xau bin/hooks/image-noexif.py
+    -v srv/inc:inc:r:rw,ed:c,xau=bin/hooks/image-noexif.py
+                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+explained:
+    share fs-path srv/inc at /inc (readable by all, read-write for user ed)
+    running this xau (execute-after-upload) plugin for all uploaded files
+"""
+
+
+# filetypes to process; ignores everything else
+EXTS = ("jpg", "jpeg", "avif", "heif", "heic")
+
+
+try:
+    from copyparty.util import fsenc
+except:
+
+    def fsenc(p):
+        return p.encode("utf-8")
+
+
+def main():
+    fp = sys.argv[1]
+    ext = fp.lower().split(".")[-1]
+    if ext not in EXTS:
+        return
+
+    cwd, fn = os.path.split(fp)
+    os.chdir(cwd)
+    f1 = fsenc(fn)
+    cmd = [
+        b"exiftool",
+        b"-exif:all=",
+        b"-iptc:all=",
+        b"-xmp:all=",
+        b"-P",
+        b"-overwrite_original",
+        b"--",
+        f1,
+    ]
+    sp.check_output(cmd)
+    print("image-noexif: stripped")
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except:
+        pass