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85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
import unicodedata
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from django.db import connection, migrations
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from django.db.backends.base.schema import BaseDatabaseSchemaEditor
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from django.db.migrations.state import StateApps
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# There are 66 Unicode non-characters; see
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# https://www.unicode.org/faq/private_use.html#nonchar4
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unicode_non_chars = {
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chr(x)
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for r in [
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range(0xFDD0, 0xFDF0), # FDD0 through FDEF, inclusive
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range(0xFFFE, 0x110000, 0x10000), # 0xFFFE, 0x1FFFE, ... 0x10FFFE inclusive
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range(0xFFFF, 0x110000, 0x10000), # 0xFFFF, 0x1FFFF, ... 0x10FFFF inclusive
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]
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for x in r
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}
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def character_is_printable(character: str) -> bool:
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return not (unicodedata.category(character) in ["Cc", "Cs"] or character in unicode_non_chars)
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def fix_stream_names(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
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Stream = apps.get_model("zerver", "Stream")
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Realm = apps.get_model("zerver", "Realm")
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total_fixed_count = 0
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realm_ids = Realm.objects.values_list("id", flat=True)
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if len(realm_ids) == 0:
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return
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print()
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for realm_id in realm_ids:
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print(f"Processing realm {realm_id}")
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realm_stream_dicts = Stream.objects.filter(realm_id=realm_id).values("id", "name")
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occupied_stream_names = {stream_dict["name"] for stream_dict in realm_stream_dicts}
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for stream_dict in realm_stream_dicts:
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stream_name = stream_dict["name"]
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fixed_stream_name = "".join(
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[
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character if character_is_printable(character) else "\N{REPLACEMENT CHARACTER}"
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for character in stream_name
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]
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)
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if fixed_stream_name == stream_name:
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continue
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if fixed_stream_name == "":
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fixed_stream_name = "(no name)"
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# The process of stripping invalid characters can lead to collisions,
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# with the new stream name being the same as the name of another existing stream.
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# We append underscore until the name no longer conflicts.
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while fixed_stream_name in occupied_stream_names:
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fixed_stream_name += "_"
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occupied_stream_names.add(fixed_stream_name)
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total_fixed_count += 1
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with connection.cursor() as cursor:
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cursor.execute(
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"UPDATE zerver_stream SET name = %s WHERE id = %s",
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[fixed_stream_name, stream_dict["id"]],
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)
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print(f"Fixed {total_fixed_count} stream names")
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class Migration(migrations.Migration):
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atomic = False
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dependencies = [
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("zerver", "0374_backfill_user_delete_realmauditlog"),
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]
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operations = [
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migrations.RunPython(
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fix_stream_names,
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reverse_code=migrations.RunPython.noop,
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elidable=True,
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),
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]
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