add /validate endpoint for md dataset

CHANGES.md

@@ -1,5 +1,11 @@
 # Release Notes
 
+## Unreleased
+
+### titiler.xarray
+
+* add `/validate` endpoint via `ValidateExtension` extension
+
 ## 0.25.0 (2025-11-07)
 
 ### Misc 

src/titiler/xarray/tests/fixtures/zarr_5d.zarr/dataset/zarr.json

@@ -0,0 +1,55 @@
+{
+  "shape": [
+    2,
+    1,
+    1,
+    33,
+    35
+  ],
+  "data_type": "int64",
+  "chunk_grid": {
+    "name": "regular",
+    "configuration": {
+      "chunk_shape": [
+        2,
+        1,
+        1,
+        33,
+        35
+      ]
+    }
+  },
+  "chunk_key_encoding": {
+    "name": "default",
+    "configuration": {
+      "separator": "/"
+    }
+  },
+  "fill_value": 0,
+  "codecs": [
+    {
+      "name": "bytes",
+      "configuration": {
+        "endian": "little"
+      }
+    },
+    {
+      "name": "zstd",
+      "configuration": {
+        "level": 0,
+        "checksum": false
+      }
+    }
+  ],
+  "attributes": {},
+  "dimension_names": [
+    "time",
+    "universe",
+    "z",
+    "y",
+    "x"
+  ],
+  "zarr_format": 3,
+  "node_type": "array",
+  "storage_transformers": []
+}

src/titiler/xarray/tests/fixtures/zarr_5d.zarr/time/zarr.json

@@ -0,0 +1,46 @@
+{
+  "shape": [
+    2
+  ],
+  "data_type": "int64",
+  "chunk_grid": {
+    "name": "regular",
+    "configuration": {
+      "chunk_shape": [
+        2
+      ]
+    }
+  },
+  "chunk_key_encoding": {
+    "name": "default",
+    "configuration": {
+      "separator": "/"
+    }
+  },
+  "fill_value": 0,
+  "codecs": [
+    {
+      "name": "bytes",
+      "configuration": {
+        "endian": "little"
+      }
+    },
+    {
+      "name": "zstd",
+      "configuration": {
+        "level": 0,
+        "checksum": false
+      }
+    }
+  ],
+  "attributes": {
+    "units": "days since 2022-01-01 00:00:00",
+    "calendar": "proleptic_gregorian"
+  },
+  "dimension_names": [
+    "time"
+  ],
+  "zarr_format": 3,
+  "node_type": "array",
+  "storage_transformers": []
+}

src/titiler/xarray/tests/fixtures/zarr_5d.zarr/universe/zarr.json

@@ -0,0 +1,48 @@
+{
+  "shape": [
+    1
+  ],
+  "data_type": {
+    "name": "fixed_length_utf32",
+    "configuration": {
+      "length_bytes": 36
+    }
+  },
+  "chunk_grid": {
+    "name": "regular",
+    "configuration": {
+      "chunk_shape": [
+        1
+      ]
+    }
+  },
+  "chunk_key_encoding": {
+    "name": "default",
+    "configuration": {
+      "separator": "/"
+    }
+  },
+  "fill_value": "",
+  "codecs": [
+    {
+      "name": "bytes",
+      "configuration": {
+        "endian": "little"
+      }
+    },
+    {
+      "name": "zstd",
+      "configuration": {
+        "level": 0,
+        "checksum": false
+      }
+    }
+  ],
+  "attributes": {},
+  "dimension_names": [
+    "universe"
+  ],
+  "zarr_format": 3,
+  "node_type": "array",
+  "storage_transformers": []
+}

src/titiler/xarray/tests/fixtures/zarr_5d.zarr/x/zarr.json

@@ -0,0 +1,43 @@
+{
+  "shape": [
+    35
+  ],
+  "data_type": "int64",
+  "chunk_grid": {
+    "name": "regular",
+    "configuration": {
+      "chunk_shape": [
+        35
+      ]
+    }
+  },
+  "chunk_key_encoding": {
+    "name": "default",
+    "configuration": {
+      "separator": "/"
+    }
+  },
+  "fill_value": 0,
+  "codecs": [
+    {
+      "name": "bytes",
+      "configuration": {
+        "endian": "little"
+      }
+    },
+    {
+      "name": "zstd",
+      "configuration": {
+        "level": 0,
+        "checksum": false
+      }
+    }
+  ],
+  "attributes": {},
+  "dimension_names": [
+    "x"
+  ],
+  "zarr_format": 3,
+  "node_type": "array",
+  "storage_transformers": []
+}

src/titiler/xarray/tests/fixtures/zarr_5d.zarr/y/zarr.json

@@ -0,0 +1,43 @@
+{
+  "shape": [
+    33
+  ],
+  "data_type": "int64",
+  "chunk_grid": {
+    "name": "regular",
+    "configuration": {
+      "chunk_shape": [
+        33
+      ]
+    }
+  },
+  "chunk_key_encoding": {
+    "name": "default",
+    "configuration": {
+      "separator": "/"
+    }
+  },
+  "fill_value": 0,
+  "codecs": [
+    {
+      "name": "bytes",
+      "configuration": {
+        "endian": "little"
+      }
+    },
+    {
+      "name": "zstd",
+      "configuration": {
+        "level": 0,
+        "checksum": false
+      }
+    }
+  ],
+  "attributes": {},
+  "dimension_names": [
+    "y"
+  ],
+  "zarr_format": 3,
+  "node_type": "array",
+  "storage_transformers": []
+}

src/titiler/xarray/tests/fixtures/zarr_5d.zarr/z/zarr.json

@@ -0,0 +1,43 @@
+{
+  "shape": [
+    1
+  ],
+  "data_type": "int64",
+  "chunk_grid": {
+    "name": "regular",
+    "configuration": {
+      "chunk_shape": [
+        1
+      ]
+    }
+  },
+  "chunk_key_encoding": {
+    "name": "default",
+    "configuration": {
+      "separator": "/"
+    }
+  },
+  "fill_value": 0,
+  "codecs": [
+    {
+      "name": "bytes",
+      "configuration": {
+        "endian": "little"
+      }
+    },
+    {
+      "name": "zstd",
+      "configuration": {
+        "level": 0,
+        "checksum": false
+      }
+    }
+  ],
+  "attributes": {},
+  "dimension_names": [
+    "z"
+  ],
+  "zarr_format": 3,
+  "node_type": "array",
+  "storage_transformers": []
+}