use zarr-cm for defining zarr conventions metadata

docs/geozarr-minispec.md

@@ -165,7 +165,7 @@ This example shows a geospatial Dataset with two spatial data variables. The `za
                     "schema_url": "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json",
                     "spec_url": "https://github.com/zarr-conventions/spatial/blob/v1/README.md",
                     "name": "spatial:",
-                    "description": "Spatial coordinate and transformation information"
+                    "description": "Spatial coordinate information"
                 }
             ],
             "proj:code": "EPSG:32633",
@@ -329,7 +329,7 @@ A minimal 2-level geospatial pyramid — well-suited for web mapping or non-EO d
                     "schema_url": "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json",
                     "spec_url": "https://github.com/zarr-conventions/spatial/blob/v1/README.md",
                     "name": "spatial:",
-                    "description": "Spatial coordinate and transformation information"
+                    "description": "Spatial coordinate information"
                 }
             ],
             "multiscales": {
@@ -388,7 +388,7 @@ A complete Sentinel-2 L2A scene with 6 resolution levels (variable downsampling
                     "schema_url": "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json",
                     "spec_url": "https://github.com/zarr-conventions/spatial/blob/v1/README.md",
                     "name": "spatial:",
-                    "description": "Spatial coordinate and transformation information"
+                    "description": "Spatial coordinate information"
                 }
             ],
             "multiscales": {

pyproject.toml

@@ -36,6 +36,7 @@ dependencies = [
     "rioxarray>=0.13.0",
     "cf-xarray>=0.8.0",
     "typing-extensions>=4.15.0",
+    "zarr-cm>=0.2.0",
     "aiohttp>=3.8.1",
     "s3fs>=2024.6.0",
     "boto3>=1.34.0",

src/eopf_geozarr/data_api/geozarr/common.py

@@ -12,7 +12,6 @@
     Any,
     Final,
     Literal,
-    NotRequired,
     Self,
     TypeGuard,
     TypeVar,
@@ -22,7 +21,7 @@
 from cf_xarray.utils import parse_cf_standard_name_table
 from pydantic import AfterValidator, BaseModel, Field, model_validator
 from pydantic.experimental.missing_sentinel import MISSING
-from typing_extensions import Protocol, TypedDict, runtime_checkable
+from typing_extensions import Protocol, runtime_checkable
 
 from eopf_geozarr.data_api.geozarr.projjson import ProjJSON  # noqa: TC001
 
@@ -40,29 +39,6 @@ class UNSET_TYPE:
 GEO_PROJ_VERSION: Final = "0.1"
 
 
-class ZarrConventionMetadata(BaseModel):
-    uuid: str | MISSING = MISSING
-    schema_url: str | MISSING = MISSING
-    spec_url: str | MISSING = MISSING
-    name: str | MISSING = MISSING
-    description: str | MISSING = MISSING
-
-    @model_validator(mode="after")
-    def ensure_identifiable(self) -> Self:
-        if self.uuid is MISSING and self.schema_url is MISSING and self.spec_url is MISSING:
-            raise ValueError("At least one of uuid, schema_url, or spec_url must be provided.")
-
-        return self
-
-
-class ZarrConventionMetadataJSON(TypedDict):
-    uuid: NotRequired[str]
-    schema_url: NotRequired[str]
-    name: NotRequired[str]
-    description: NotRequired[str]
-    spec_url: NotRequired[str]
-
-
 class ProjAttrs(BaseModel, extra="allow"):
     """
     Zarr attributes for coordinate reference system (CRS) encoding.

src/eopf_geozarr/data_api/geozarr/geoproj.py

@@ -4,39 +4,16 @@
 
 from __future__ import annotations
 
-from typing import Literal
-
 from pydantic import BaseModel, Field, model_validator
-from typing_extensions import TypedDict
+from zarr_cm import geo_proj
 
-from eopf_geozarr.data_api.geozarr.common import ZarrConventionMetadata, is_none
+from eopf_geozarr.data_api.geozarr.common import is_none
 from eopf_geozarr.data_api.geozarr.projjson import ProjJSON  # noqa: TC001
 
-PROJ_UUID: Literal["f17cb550-5864-4468-aeb7-f3180cfb622f"] = "f17cb550-5864-4468-aeb7-f3180cfb622f"
-
-
-class ProjConvention(TypedDict):
-    uuid: Literal["f17cb550-5864-4468-aeb7-f3180cfb622f"]
-    name: Literal["proj:"]
-    schema_url: Literal[
-        "https://raw.githubusercontent.com/zarr-experimental/geo-proj/refs/tags/v1/schema.json"
-    ]
-    spec_url: Literal["https://github.com/zarr-experimental/geo-proj/blob/v1/README.md"]
-    description: Literal["Coordinate reference system information for geospatial data"]
-
-
-class ProjConventionMetadata(ZarrConventionMetadata):
-    uuid: Literal["f17cb550-5864-4468-aeb7-f3180cfb622f"] = PROJ_UUID
-    name: Literal["proj:"] = "proj:"
-    schema_url: Literal[
-        "https://raw.githubusercontent.com/zarr-experimental/geo-proj/refs/tags/v1/schema.json"
-    ] = "https://raw.githubusercontent.com/zarr-experimental/geo-proj/refs/tags/v1/schema.json"
-    spec_url: Literal["https://github.com/zarr-experimental/geo-proj/blob/v1/README.md"] = (
-        "https://github.com/zarr-experimental/geo-proj/blob/v1/README.md"
-    )
-    description: Literal["Coordinate reference system information for geospatial data"] = (
-        "Coordinate reference system information for geospatial data"
-    )
+PROJ_UUID = geo_proj.UUID
+
+# Re-export the zarr-cm TypedDict for the convention metadata object
+ProjConvention = geo_proj.GeoProjAttrs
 
 
 class Proj(BaseModel):

src/eopf_geozarr/data_api/geozarr/multiscales/__init__.py

@@ -1,10 +1,9 @@
 """Zarr multiscales convention support."""
 
 from .geozarr import MultiscaleGroupAttrs, MultiscaleMeta
-from .zcm import MULTISCALE_CONVENTION_METADATA, Multiscales, ScaleLevel, ScaleLevelJSON
+from .zcm import Multiscales, ScaleLevel, ScaleLevelJSON
 
 __all__ = [
-    "MULTISCALE_CONVENTION_METADATA",
     "MultiscaleGroupAttrs",
     "MultiscaleMeta",
     "Multiscales",

src/eopf_geozarr/data_api/geozarr/multiscales/geozarr.py

@@ -5,8 +5,7 @@
 from pydantic import BaseModel, model_validator
 from pydantic.experimental.missing_sentinel import MISSING
 from typing_extensions import TypedDict
-
-from eopf_geozarr.data_api.geozarr.common import ZarrConventionMetadata  # noqa: TC001
+from zarr_cm import ConventionMetadataObject  # noqa: TC002
 
 from . import tms, zcm
 
@@ -56,7 +55,7 @@ class MultiscaleGroupAttrs(BaseModel):
     multiscales: MultiscaleAttrs
     """
 
-    zarr_conventions: tuple[ZarrConventionMetadata, ...] | MISSING = MISSING
+    zarr_conventions: tuple[ConventionMetadataObject, ...] | MISSING = MISSING
     multiscales: MultiscaleMeta
 
     _zcm_multiscales: zcm.Multiscales | None = None

src/eopf_geozarr/data_api/geozarr/multiscales/zcm.py

@@ -1,70 +1,26 @@
 from __future__ import annotations
 
-from typing import Final, Literal, NotRequired
-
 from pydantic import BaseModel, field_validator
 from pydantic.experimental.missing_sentinel import MISSING
-from typing_extensions import TypedDict
-
-from eopf_geozarr.data_api.geozarr.common import (
-    ZarrConventionMetadata,
-    ZarrConventionMetadataJSON,
-)
-
-ConventionID = Literal["d35379db-88df-4056-af3a-620245f8e347"]
-CONVENTION_ID: Final[ConventionID] = "d35379db-88df-4056-af3a-620245f8e347"
-
-ConventionSchemaURL = Literal[
-    "https://raw.githubusercontent.com/zarr-conventions/multiscales/refs/tags/v1/schema.json"
-]
-CONVENTION_SCHEMA_URL: Final[ConventionSchemaURL] = (
-    "https://raw.githubusercontent.com/zarr-conventions/multiscales/refs/tags/v1/schema.json"
-)
-
-ConventionSpecURL = Literal["https://github.com/zarr-conventions/multiscales/blob/v1/README.md"]
-CONVENTION_SPEC_URL: Final[ConventionSpecURL] = (
-    "https://github.com/zarr-conventions/multiscales/blob/v1/README.md"
-)
-
-ConventionDescription = Literal["Multiscale layout of zarr datasets"]
-CONVENTION_DESCRIPTION: Final[ConventionDescription] = "Multiscale layout of zarr datasets"
-
-ConventionName = Literal["multiscales"]
-CONVENTION_NAME: Final[ConventionName] = "multiscales"
-
-
-class MultiscaleConventionMetadata(ZarrConventionMetadata):
-    uuid: ConventionID = CONVENTION_ID
-    schema_url: ConventionSchemaURL = CONVENTION_SCHEMA_URL
-    name: ConventionName = CONVENTION_NAME
-    description: ConventionDescription = CONVENTION_DESCRIPTION
-    spec_url: ConventionSpecURL = CONVENTION_SPEC_URL
-
-
-class MultiscaleConventionMetadataJSON(TypedDict):
-    """
-    A TypedDict representation of the Multiscales convention metadata
-    """
+from zarr_cm import ConventionMetadataObject
+from zarr_cm import multiscales as multiscales_cm
 
-    uuid: NotRequired[ConventionID]
-    schema_url: NotRequired[ConventionSchemaURL]
-    name: NotRequired[ConventionName]
-    description: NotRequired[ConventionDescription]
-    spec_url: NotRequired[ConventionSpecURL]
+# Convention constants from zarr-cm
+CONVENTION_ID = multiscales_cm.UUID
+CONVENTION_SCHEMA_URL = multiscales_cm.SCHEMA_URL
+CONVENTION_SPEC_URL = multiscales_cm.SPEC_URL
+CONVENTION_NAME = multiscales_cm.CMO["name"]
+CONVENTION_DESCRIPTION = multiscales_cm.CMO["description"]
 
-
-# A final dict representation of the Multiscales convention metadata
-MULTISCALE_CONVENTION_METADATA: Final[MultiscaleConventionMetadataJSON] = {
-    "uuid": CONVENTION_ID,
-    "schema_url": CONVENTION_SCHEMA_URL,
-    "name": CONVENTION_NAME,
-    "description": CONVENTION_DESCRIPTION,
-    "spec_url": CONVENTION_SPEC_URL,
-}
+# Re-export zarr-cm TypedDicts
+TransformJSON = multiscales_cm.Transform
+ScaleLevelJSON = multiscales_cm.LayoutObject
+MultiscalesJSON = multiscales_cm.MultiscalesAttrs
+MultiscalesConventionAttrsJSON = multiscales_cm.MultiscalesConventionAttrs
 
 
 class ZarrConventionAttrs(BaseModel):
-    zarr_conventions: tuple[ZarrConventionMetadata, ...]
+    zarr_conventions: tuple[ConventionMetadataObject, ...]
 
     model_config = {"extra": "allow"}
 
@@ -74,11 +30,6 @@ class Transform(BaseModel):
     translation: tuple[float, ...] | MISSING = MISSING
 
 
-class TransformJSON(TypedDict):
-    scale: NotRequired[tuple[float, ...]]
-    translation: NotRequired[tuple[float, ...]]
-
-
 class ScaleLevel(BaseModel):
     asset: str
     derived_from: str | MISSING = MISSING
@@ -88,52 +39,29 @@ class ScaleLevel(BaseModel):
     model_config = {"extra": "allow"}
 
 
-class ScaleLevelJSON(TypedDict):
-    asset: str
-    derived_from: NotRequired[str]
-    transform: TransformJSON
-    resampling_method: NotRequired[str]
-
-
 class Multiscales(BaseModel):
     layout: tuple[ScaleLevel, ...]
     resampling_method: str | MISSING = MISSING
 
     model_config = {"extra": "allow"}
 
 
-class MultiscalesJSON(TypedDict):
-    version: NotRequired[str]
-    layout: tuple[ScaleLevelJSON, ...]
-    resampling_method: NotRequired[str]
-
-
 class MultiscalesAttrs(ZarrConventionAttrs):
     multiscales: Multiscales
     model_config = {"extra": "allow"}
 
     @field_validator("zarr_conventions", mode="after")
     @classmethod
     def ensure_multiscales_convention(
-        cls, value: tuple[ZarrConventionMetadata, ...]
-    ) -> tuple[ZarrConventionMetadata, ...]:
+        cls, value: tuple[ConventionMetadataObject, ...]
+    ) -> tuple[ConventionMetadataObject, ...]:
         """
         Iterate over the elements of zarr_conventions and check that at least one of them is
         multiscales
         """
-        success: bool = False
-        errors: dict[int, ValueError] = {}
-        for idx, convention_meta in enumerate(value):
-            try:
-                MultiscaleConventionMetadata(**convention_meta.model_dump())
-                success = True
-            except ValueError as e:
-                errors[idx] = e
-        if not success:
-            raise ValueError("Multiscales convention not found. Errors: " + str(errors))
+        expected_uuid = multiscales_cm.CMO["uuid"]
+        if not any(c["uuid"] == expected_uuid for c in value):
+            raise ValueError(
+                f"Multiscales convention (uuid={expected_uuid}) not found in zarr_conventions"
+            )
         return value
-
-
-class MultiscalesAttrsJSON(TypedDict):
-    zarr_conventions: tuple[ZarrConventionMetadataJSON, ...]
-    multiscales: MultiscalesJSON

src/eopf_geozarr/data_api/geozarr/spatial.py

@@ -4,40 +4,15 @@
 
 from __future__ import annotations
 
-from typing import Literal
-
 from pydantic import BaseModel, Field, model_validator
-from typing_extensions import TypedDict
-
-from eopf_geozarr.data_api.geozarr.common import ZarrConventionMetadata, is_none
-
-SPATIAL_UUID: Literal["689b58e2-cf7b-45e0-9fff-9cfc0883d6b4"] = (
-    "689b58e2-cf7b-45e0-9fff-9cfc0883d6b4"
-)
-
-
-class SpatialConvention(TypedDict):
-    uuid: Literal["689b58e2-cf7b-45e0-9fff-9cfc0883d6b4"]
-    name: Literal["spatial:"]
-    schema_url: Literal[
-        "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json"
-    ]
-    spec_url: Literal["https://github.com/zarr-conventions/spatial/blob/v1/README.md"]
-    description: Literal["Spatial coordinate and transformation information"]
-
-
-class SpatialConventionMetadata(ZarrConventionMetadata):
-    uuid: Literal["689b58e2-cf7b-45e0-9fff-9cfc0883d6b4"] = SPATIAL_UUID
-    name: Literal["spatial:"] = "spatial:"
-    schema_url: Literal[
-        "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json"
-    ] = "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json"
-    spec_url: Literal["https://github.com/zarr-conventions/spatial/blob/v1/README.md"] = (
-        "https://github.com/zarr-conventions/spatial/blob/v1/README.md"
-    )
-    description: Literal["Spatial coordinate and transformation information"] = (
-        "Spatial coordinate and transformation information"
-    )
+from zarr_cm import spatial as spatial_cm
+
+from eopf_geozarr.data_api.geozarr.common import is_none
+
+SPATIAL_UUID = spatial_cm.UUID
+
+# Re-export the zarr-cm TypedDict for the convention metadata object
+SpatialConvention = spatial_cm.SpatialAttrs
 
 
 class Spatial(BaseModel):