feat(blocks): Add jina fact checker block (#8409)

Co-authored-by: Aarushi <50577581+aarushik93@users.noreply.github.com>

autogpt_platform/backend/backend/blocks/jina/fact_checker.py

@@ -0,0 +1,59 @@
+from urllib.parse import quote
+
+import requests
+
+from backend.blocks.jina._auth import (
+    JinaCredentials,
+    JinaCredentialsField,
+    JinaCredentialsInput,
+)
+from backend.data.block import Block, BlockCategory, BlockOutput, BlockSchema
+from backend.data.model import SchemaField
+
+
+class FactCheckerBlock(Block):
+    class Input(BlockSchema):
+        statement: str = SchemaField(
+            description="The statement to check for factuality"
+        )
+        credentials: JinaCredentialsInput = JinaCredentialsField()
+
+    class Output(BlockSchema):
+        factuality: float = SchemaField(
+            description="The factuality score of the statement"
+        )
+        result: bool = SchemaField(description="The result of the factuality check")
+        reason: str = SchemaField(description="The reason for the factuality result")
+        error: str = SchemaField(description="Error message if the check fails")
+
+    def __init__(self):
+        super().__init__(
+            id="d38b6c5e-9968-4271-8423-6cfe60d6e7e6",
+            description="This block checks the factuality of a given statement using Jina AI's Grounding API.",
+            categories={BlockCategory.SEARCH},
+            input_schema=FactCheckerBlock.Input,
+            output_schema=FactCheckerBlock.Output,
+        )
+
+    def run(
+        self, input_data: Input, *, credentials: JinaCredentials, **kwargs
+    ) -> BlockOutput:
+        encoded_statement = quote(input_data.statement)
+        url = f"https://g.jina.ai/{encoded_statement}"
+
+        headers = {
+            "Accept": "application/json",
+            "Authorization": f"Bearer {credentials.api_key.get_secret_value()}",
+        }
+
+        response = requests.get(url, headers=headers)
+        response.raise_for_status()
+        data = response.json()
+
+        if "data" in data:
+            data = data["data"]
+            yield "factuality", data["factuality"]
+            yield "result", data["result"]
+            yield "reason", data["reason"]
+        else:
+            raise RuntimeError(f"Expected 'data' key not found in response: {data}")