Adding free-text extension.

CHANGES.md

@@ -5,6 +5,7 @@
 ### Added
 
 * Add benchmark in CI ([#650](https://github.com/stac-utils/stac-fastapi/pull/650))
+* Add Free-text Extension to third party extensions
 
 ### Changed
 

docs/mkdocs.yml

@@ -60,6 +60,7 @@ nav:
               - version: api/stac_fastapi/extensions/version.md
           - third_party:
               - bulk_transactions: api/stac_fastapi/extensions/third_party/bulk_transactions.md
+              - free_text: api/stac_fastapi/extensions/third_party/free_text.md
               - index: api/stac_fastapi/extensions/third_party/index.md
       - stac_fastapi.types:
           - module: api/stac_fastapi/types/index.md

stac_fastapi/api/stac_fastapi/api/config.py

@@ -1,4 +1,5 @@
 """Application settings."""
+
 import enum
 
 
@@ -23,3 +24,4 @@ class AddOns(enum.Enum):
     """Enumeration of available third party add ons."""
 
     bulk_transaction = "bulk-transaction"
+    free_text = "free-text"

stac_fastapi/extensions/stac_fastapi/extensions/third_party/__init__.py

@@ -1,4 +1,9 @@
 """stac_api.extensions.third_party module."""
+
 from .bulk_transactions import BulkTransactionExtension
+from .free_text import FreeTextExtension
 
-__all__ = ("BulkTransactionExtension",)
+__all__ = (
+    "BulkTransactionExtension",
+    "FreeTextExtension",
+)

stac_fastapi/extensions/stac_fastapi/extensions/third_party/free_text/__init__.py

@@ -0,0 +1,5 @@
+"""Query extension module."""
+
+from .free_text import FreeTextExtension
+
+__all__ = ["FreeTextExtension"]

stac_fastapi/extensions/stac_fastapi/extensions/third_party/free_text/free_text.py

@@ -0,0 +1,46 @@
+"""Free-text extension."""
+
+from typing import List, Optional
+
+import attr
+from fastapi import FastAPI
+
+from stac_fastapi.types.extension import ApiExtension
+
+from .request import FreeTextExtensionGetRequest, FreeTextExtensionPostRequest
+
+
+@attr.s
+class FreeTextExtension(ApiExtension):
+    """Free-text Extension.
+
+    The Free-text extension adds an additional `q` parameter to `/search` requests which
+    allows the caller to perform free-text queries against STAC metadata.
+    https://github.com/stac-api-extensions/freetext-search/README.md
+    """
+
+    GET = FreeTextExtensionGetRequest
+    POST = FreeTextExtensionPostRequest
+
+    conformance_classes: List[str] = attr.ib(
+        factory=lambda: [
+            "https://api.stacspec.org/v1.0.0-rc.1/item-search#free-text",
+            "https://api.stacspec.org/v1.0.0-rc.1/item-search#advanced-free-text",
+            "https://api.stacspec.org/v1.0.0-rc.1/collection-search#free-text",
+            "https://api.stacspec.org/v1.0.0-rc.1/collection-search#advanced-free-text",
+            "https://api.stacspec.org/v1.0.0-rc.1/ogcapi-features#free-text",
+            "https://api.stacspec.org/v1.0.0-rc.1/ogcapi-features#advanced-free-text",
+        ]
+    )
+    schema_href: Optional[str] = attr.ib(default=None)
+
+    def register(self, app: FastAPI) -> None:
+        """Register the extension with a FastAPI application.
+
+        Args:
+            app: target FastAPI application.
+
+        Returns:
+            None
+        """
+        pass

stac_fastapi/extensions/stac_fastapi/extensions/third_party/free_text/request.py

@@ -0,0 +1,21 @@
+"""Request model for the Free-text extension."""
+
+from typing import Any, Dict, Optional
+
+import attr
+from pydantic import BaseModel
+
+from stac_fastapi.types.search import APIRequest
+
+
+@attr.s
+class FreeTextExtensionGetRequest(APIRequest):
+    """Free-text Extension GET request model."""
+
+    q: Optional[str] = attr.ib(default=None)
+
+
+class FreeTextExtensionPostRequest(BaseModel):
+    """Free-text Extension POST request model."""
+
+    q: Optional[Dict[str, Dict[str, Any]]]