refactor: remove document_consumer_declaration signal infrastructure

Remove the document_consumer_declaration signal that was previously used
for parser registration. Each parser app no longer connects to this signal,
and the signal declaration itself has been removed from documents/signals.

Changes:
- Remove document_consumer_declaration from documents/signals/__init__.py
- Remove ready() methods and signal imports from all parser app configs
- Delete signal shim files (signals.py) from all parser apps:
  - paperless_tesseract/signals.py
  - paperless_text/signals.py
  - paperless_tika/signals.py
  - paperless_mail/signals.py
  - paperless_remote/signals.py

Parser discovery now happens exclusively through the ParserRegistry
system introduced in the previous refactor phases.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/documents/signals/__init__.py

@@ -2,5 +2,4 @@ from django.dispatch import Signal
 
 document_consumption_started = Signal()
 document_consumption_finished = Signal()
-document_consumer_declaration = Signal()
 document_updated = Signal()

src/paperless_mail/apps.py

@@ -1,18 +1,8 @@
 from django.apps import AppConfig
-from django.conf import settings
 from django.utils.translation import gettext_lazy as _
 
-from paperless_mail.signals import mail_consumer_declaration
-
 
 class PaperlessMailConfig(AppConfig):
     name = "paperless_mail"
 
     verbose_name = _("Paperless mail")
-
-    def ready(self) -> None:
-        from documents.signals import document_consumer_declaration
-
-        if settings.TIKA_ENABLED:
-            document_consumer_declaration.connect(mail_consumer_declaration)
-        AppConfig.ready(self)

src/paperless_mail/signals.py

@@ -1,19 +0,0 @@
-def get_parser(*args, **kwargs):
-    from paperless.parsers.mail import MailDocumentParser
-
-    # MailDocumentParser accepts no constructor args in the new-style protocol.
-    # Pop legacy args that arrive from the signal-based consumer path.
-    # Phase 4 will replace this signal path with the ParserRegistry.
-    kwargs.pop("logging_group", None)
-    kwargs.pop("progress_callback", None)
-    return MailDocumentParser()
-
-
-def mail_consumer_declaration(sender, **kwargs):
-    return {
-        "parser": get_parser,
-        "weight": 20,
-        "mime_types": {
-            "message/rfc822": ".eml",
-        },
-    }

src/paperless_remote/apps.py

@@ -1,14 +1,5 @@
 from django.apps import AppConfig
 
-from paperless_remote.signals import remote_consumer_declaration
-
 
 class PaperlessRemoteParserConfig(AppConfig):
     name = "paperless_remote"
-
-    def ready(self) -> None:
-        from documents.signals import document_consumer_declaration
-
-        document_consumer_declaration.connect(remote_consumer_declaration)
-
-        AppConfig.ready(self)

src/paperless_remote/signals.py

@@ -1,38 +0,0 @@
-from __future__ import annotations
-
-from typing import Any
-
-
-def get_parser(*args: Any, **kwargs: Any) -> Any:
-    from paperless.parsers.remote import RemoteDocumentParser
-
-    # The new RemoteDocumentParser does not accept the progress_callback
-    # kwarg injected by the old signal-based consumer.  logging_group is
-    # forwarded as a positional arg.
-    # Phase 4 will replace this signal path with the new ParserRegistry.
-    kwargs.pop("progress_callback", None)
-    return RemoteDocumentParser(*args, **kwargs)
-
-
-def get_supported_mime_types() -> dict[str, str]:
-    from django.conf import settings
-
-    from paperless.parsers.remote import RemoteDocumentParser
-    from paperless.parsers.remote import RemoteEngineConfig
-
-    config = RemoteEngineConfig(
-        engine=settings.REMOTE_OCR_ENGINE,
-        api_key=settings.REMOTE_OCR_API_KEY,
-        endpoint=settings.REMOTE_OCR_ENDPOINT,
-    )
-    if not config.engine_is_valid():
-        return {}
-    return RemoteDocumentParser.supported_mime_types()
-
-
-def remote_consumer_declaration(sender: Any, **kwargs: Any) -> dict[str, Any]:
-    return {
-        "parser": get_parser,
-        "weight": 5,
-        "mime_types": get_supported_mime_types(),
-    }

src/paperless_tesseract/apps.py

@@ -1,14 +1,5 @@
 from django.apps import AppConfig
 
-from paperless_tesseract.signals import tesseract_consumer_declaration
-
 
 class PaperlessTesseractConfig(AppConfig):
     name = "paperless_tesseract"
-
-    def ready(self) -> None:
-        from documents.signals import document_consumer_declaration
-
-        document_consumer_declaration.connect(tesseract_consumer_declaration)
-
-        AppConfig.ready(self)

src/paperless_tesseract/signals.py

@@ -1,34 +0,0 @@
-from __future__ import annotations
-
-from typing import Any
-
-
-def get_parser(*args: Any, **kwargs: Any) -> Any:
-    from paperless.parsers.tesseract import RasterisedDocumentParser
-
-    # RasterisedDocumentParser accepts logging_group for constructor compatibility but
-    # does not store or use it (no legacy DocumentParser base class).
-    # progress_callback is also not used.  Both may arrive as a positional arg
-    # (consumer) or a keyword arg (views); *args absorbs the positional form,
-    # kwargs.pop handles the keyword form.  Phase 4 will replace this signal
-    # path with the new ParserRegistry so the shim can be removed at that point.
-    kwargs.pop("logging_group", None)
-    kwargs.pop("progress_callback", None)
-    return RasterisedDocumentParser(*args, **kwargs)
-
-
-def tesseract_consumer_declaration(sender: Any, **kwargs: Any) -> dict[str, Any]:
-    return {
-        "parser": get_parser,
-        "weight": 0,
-        "mime_types": {
-            "application/pdf": ".pdf",
-            "image/jpeg": ".jpg",
-            "image/png": ".png",
-            "image/tiff": ".tif",
-            "image/gif": ".gif",
-            "image/bmp": ".bmp",
-            "image/webp": ".webp",
-            "image/heic": ".heic",
-        },
-    }

src/paperless_text/apps.py

@@ -1,14 +1,5 @@
 from django.apps import AppConfig
 
-from paperless_text.signals import text_consumer_declaration
-
 
 class PaperlessTextConfig(AppConfig):
     name = "paperless_text"
-
-    def ready(self) -> None:
-        from documents.signals import document_consumer_declaration
-
-        document_consumer_declaration.connect(text_consumer_declaration)
-
-        AppConfig.ready(self)

src/paperless_text/signals.py

@@ -1,29 +0,0 @@
-from __future__ import annotations
-
-from typing import Any
-
-
-def get_parser(*args: Any, **kwargs: Any) -> Any:
-    from paperless.parsers.text import TextDocumentParser
-
-    # TextDocumentParser accepts logging_group for constructor compatibility but
-    # does not store or use it (no legacy DocumentParser base class).
-    # progress_callback is also not used.  Both may arrive as a positional arg
-    # (consumer) or a keyword arg (views); *args absorbs the positional form,
-    # kwargs.pop handles the keyword form.  Phase 4 will replace this signal
-    # path with the new ParserRegistry so the shim can be removed at that point.
-    kwargs.pop("logging_group", None)
-    kwargs.pop("progress_callback", None)
-    return TextDocumentParser(*args, **kwargs)
-
-
-def text_consumer_declaration(sender: Any, **kwargs: Any) -> dict[str, Any]:
-    return {
-        "parser": get_parser,
-        "weight": 10,
-        "mime_types": {
-            "text/plain": ".txt",
-            "text/csv": ".csv",
-            "application/csv": ".csv",
-        },
-    }

src/paperless_tika/apps.py

@@ -1,15 +1,5 @@
 from django.apps import AppConfig
-from django.conf import settings
-
-from paperless_tika.signals import tika_consumer_declaration
 
 
 class PaperlessTikaConfig(AppConfig):
     name = "paperless_tika"
-
-    def ready(self) -> None:
-        from documents.signals import document_consumer_declaration
-
-        if settings.TIKA_ENABLED:
-            document_consumer_declaration.connect(tika_consumer_declaration)
-        AppConfig.ready(self)

src/paperless_tika/signals.py

@@ -1,33 +0,0 @@
-def get_parser(*args, **kwargs):
-    from paperless.parsers.tika import TikaDocumentParser
-
-    # TikaDocumentParser accepts logging_group for constructor compatibility but
-    # does not store or use it (no legacy DocumentParser base class).
-    # progress_callback is also not used.  Both may arrive as a positional arg
-    # (consumer) or a keyword arg (views); *args absorbs the positional form,
-    # kwargs.pop handles the keyword form.  Phase 4 will replace this signal
-    # path with the new ParserRegistry so the shim can be removed at that point.
-    kwargs.pop("logging_group", None)
-    kwargs.pop("progress_callback", None)
-    return TikaDocumentParser()
-
-
-def tika_consumer_declaration(sender, **kwargs):
-    return {
-        "parser": get_parser,
-        "weight": 10,
-        "mime_types": {
-            "application/msword": ".doc",
-            "application/vnd.openxmlformats-officedocument.wordprocessingml.document": ".docx",
-            "application/vnd.ms-excel": ".xls",
-            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet": ".xlsx",
-            "application/vnd.ms-powerpoint": ".ppt",
-            "application/vnd.openxmlformats-officedocument.presentationml.presentation": ".pptx",
-            "application/vnd.openxmlformats-officedocument.presentationml.slideshow": ".ppsx",
-            "application/vnd.oasis.opendocument.presentation": ".odp",
-            "application/vnd.oasis.opendocument.spreadsheet": ".ods",
-            "application/vnd.oasis.opendocument.text": ".odt",
-            "application/vnd.oasis.opendocument.graphics": ".odg",
-            "text/rtf": ".rtf",
-        },
-    }