bugs

core/views/caves.py

@@ -25,6 +25,7 @@ from troggle.core.utils import (
     WriteAndCommitError,
     current_expo,
     get_editor, 
+    git_string,
     write_and_commit,
     is_identified_user,
 )

core/views/editor_helpers.py

@@ -186,17 +186,49 @@ def extract_gps(dict):
 
     return f"{direction}<br />{altitude}</br />{timestamp_utc}<br />"
 
+def fix_dump_bugs(exif_dict):
+    """piexif has a bug, this gets around it.
+    The Exif standard leaves some instance types "undefined". Great :-(
+    
+    see https://github.com/hMatoba/Piexif/issues/83
+    see EXIF standard https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf
+    """
+    if 41729 in exif_dict['Exif'] and isinstance(exif_dict['Exif'][41729], int):
+        # SceneType = 1 for a directly photogrpahed image
+        cc = exif_dict['Exif'][41729]
+        print(f"PIEXIF BUG workaround: 41729 {cc} is {type(cc)}") 
+        exif_dict['Exif'][41729] = str(exif_dict['Exif'][41729]).encode('utf-8')    
+
+    if 37121 in exif_dict['Exif']:
+        cc = exif_dict['Exif'][37121]
+        if isinstance(cc, tuple):
+            print(f"PIEXIF BUG workaround: 37121 {cc} is {type(cc)}") 
+            exif_dict['Exif'][37121] = ",".join([str(v) for v in cc]).encode("ASCII")    
+    if 37380 in exif_dict['Exif']:
+        # exposure bias
+        cc = exif_dict['Exif'][37380]
+        if isinstance(cc, tuple):
+            print(f"PIEXIF BUG workaround: 37380 {cc} is {type(cc)}") 
+            exif_dict['Exif'][37380] = (0, 1)   
+
+    if 50728 in exif_dict['Exif']:
+        cc = exif_dict['Exif'][50728]
+        if isinstance(cc, tuple):
+            if cc <= 1:
+                rational = f"({cc * 1000:.0f}, 1000)"
+            else:
+                rational = f"(1000, {cc * 1000:.0f})"
+            print(f"PIEXIF BUG workaround: 50728 {cc} is {type(cc)} - using {rational}") 
+            exif_dict['Exif'][50728] = rational  
+       
+    return exif_dict
+    
 @login_required_if_public
 def new_image_form(request, path):
     """Manages a form to upload new images
     
     exif_dict = piexif.load(im.info["exif"])
-    exif_dict = {"0th":zeroth_ifd, "Exif":exif_ifd, "GPS":gps_ifd, ...more}
+    exif_dict = {"0th":zeroth_ifd, "Exif":exif_ifd, "GPS":gps_ifd, ...more}   
-    
-    The "Exif.Image.NewSubfileType" tag (ID 41729) serves to identify 
-    the type of image or subfile data contained in the image file
-    0: full resolution, 1: reduced resolution
-    
     """
     THUMB_QUALITY = 70
     IMAGE_QUALITY = 85
@@ -238,12 +270,8 @@ def new_image_form(request, path):
                     gps_annotations = extract_gps(gps_data) 
                     descrip += gps_annotations
                 i = reorient_image(i, exif_dict)
-                exif_dict['Exif'][41729] = b'1' # I am not sure this should be binary..
-                # can crash here with bad exif data
                 try:
-                    # This is never written back into the images ?!!
+                    exif = piexif.dump(fix_dump_bugs(exif_dict))
-                    exif = piexif.dump(exif_dict)
-                    # int(f"new_image_form() After DUMP {exif=}")
                 except:
                     exif = None
                 # date and time from exif data
@@ -275,12 +303,16 @@ def new_image_form(request, path):
             if "exif" in i.info:
                 exif_dict = piexif.load(i.info["exif"])
                 exif_dict['GPS'] = gps_data # saved from before
-                exif_bytes = piexif.dump(exif_dict)
+                try:
+                    exif_bytes = piexif.dump(fix_dump_bugs(exif_dict))
+                except Exception as e:
+                    print(f"EXCEPTION {e}\n     {exif_dict=}\n     {gps_data=}")
+                    raise
                 i.save(ib, format='JPEG', quality = IMAGE_QUALITY, exif=exif_bytes) 
                 
                 exif_dict = piexif.load(t.info["exif"])
                 exif_dict['GPS'] = gps_data # saved from before
-                exif_bytes = piexif.dump(exif_dict)          
+                exif_bytes = piexif.dump(fix_dump_bugs(exif_dict))          
                 t.save(tb, format='JPEG', quality = THUMB_QUALITY, exif=exif_bytes) 
                    
             i.save(ib, format='JPEG', quality = IMAGE_QUALITY) 
@@ -312,7 +344,7 @@ def new_image_form(request, path):
                         (thumb_path, tb.getbuffer(), False),
                     ],
                     # f"{change_message} - online adding of an image",
-                    f"Online adding of an image",
+                    f"Online adding of an image to {path}",
                     editor # this works, a new who_are_you typed on the Image form is used as the git comment 
                 )
             except WriteAndCommitError as e: