feat: add title and description to algorithm metadata

src/titiler/core/titiler/core/algorithm/base.py

@@ -31,6 +31,8 @@ def __call__(self, img: ImageData) -> ImageData:
 
 class AlgorithmMetadata(BaseModel):
     """Algorithm metadata."""
+    title: Optional[str] = None
+    description: Optional[str] = None
 
     inputs: Dict
     outputs: Dict

src/titiler/core/titiler/core/algorithm/dem.py

@@ -13,6 +13,9 @@
 class HillShade(BaseAlgorithm):
     """Hillshade."""
 
+    title: str = "Hillshade"
+    description: str = "Create hillshade from DEM dataset."
+
     # parameters
     azimuth: int = Field(90, ge=0, lt=360)
     angle_altitude: float = Field(90.0, ge=-90.0, lt=90.0)
@@ -62,6 +65,9 @@ class Contours(BaseAlgorithm):
     Original idea from https://custom-scripts.sentinel-hub.com/dem/contour-lines/
     """
 
+    title: str = "Contours"
+    description: str = "Create contours from DEM dataset."
+
     # parameters
     increment: int = Field(35, ge=0, lt=999)
     thickness: int = Field(1, ge=0, lt=10)
@@ -100,6 +106,9 @@ def __call__(self, img: ImageData) -> ImageData:
 class Terrarium(BaseAlgorithm):
     """Encode DEM into RGB (Mapzen Terrarium)."""
 
+    title: str = "Terrarium"
+    description: str = "Encode DEM into RGB (Mapzen Terrarium)."
+
     # metadata
     input_nbands: int = 1
     output_nbands: int = 3
@@ -123,6 +132,9 @@ def __call__(self, img: ImageData) -> ImageData:
 class TerrainRGB(BaseAlgorithm):
     """Encode DEM into RGB (Mapbox Terrain RGB)."""
 
+    title: str = "Terrarium"
+    description: str = "Encode DEM into RGB (Mapbox Terrain RGB)."
+
     # parameters
     interval: float = Field(0.1, ge=0.0, lt=1.0)
     baseval: float = Field(-10000.0, ge=-99999.0, lt=99999.0)

src/titiler/core/titiler/core/algorithm/index.py

@@ -11,6 +11,9 @@
 class NormalizedIndex(BaseAlgorithm):
     """Normalized Difference Index."""
 
+    title: str = "Normalized Difference Index"
+    description: str = "Compute normalized difference index from two bands."
+
     # metadata
     input_nbands: int = 2
     output_nbands: int = 1

src/titiler/core/titiler/core/factory.py

@@ -1653,6 +1653,15 @@ def metadata(algorithm: BaseAlgorithm) -> AlgorithmMetadata:
             """Algorithm Metadata"""
             props = algorithm.model_json_schema()["properties"]
 
+            # title and description
+            info = {
+                k: v['default']
+                for k, v in props.items()
+                if k == "title" or k == "description"
+            }
+            title = info.get('title', None)
+            description = info.get('description', None)
+
             # Inputs Metadata
             ins = {
                 k.replace("input_", ""): v["default"]
@@ -1671,9 +1680,9 @@ def metadata(algorithm: BaseAlgorithm) -> AlgorithmMetadata:
             params = {
                 k: v
                 for k, v in props.items()
-                if not k.startswith("input_") and not k.startswith("output_")
+                if not k.startswith("input_") and not k.startswith("output_") and k != "title" and k != "description"
             }
-            return AlgorithmMetadata(inputs=ins, outputs=outs, parameters=params)
+            return AlgorithmMetadata(title=title, description=description, inputs=ins, outputs=outs, parameters=params)
 
         @self.router.get(
             "/algorithms",