Add databricks viewer-oauth sample streamlit app

local/python-oauth-databricks-app/app.py

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+# -*- coding: utf-8 -*-
+import os
+
+import pandas as pd
+
+from posit.connect.external.databricks import viewer_credentials_provider
+from shiny.ui.dataframe import output_data_frame
+
+from databricks import sql
+from databricks.sdk.service.iam import CurrentUserAPI
+from databricks.sdk.core import ApiClient, Config
+
+from shiny import App, Inputs, Outputs, Session, render, ui
+
+DATABRICKS_HOST = os.getenv("DATABRICKS_HOST")
+DATABRICKS_HOST_URL = f"https://{DATABRICKS_HOST}"
+DATABRICKS_SQL_PATH = os.getenv("DATABRICKS_SQL_PATH")
+
+app_ui = ui.page_fluid(ui.output_text("text"), ui.output_data_frame("result"))
+
+
+def server(input: Inputs, output: Outputs, session: Session):
+    """
+    Shiny for Python example application that shows user information and
+    the first few rows from a table hosted in Databricks.
+    """
+    session_token = session.http_conn.headers.get(
+        "Posit-Connect-User-Session-Token"
+    )
+    credentials_provider = viewer_credentials_provider(
+        user_session_token=session_token
+    )
+
+    if DATABRICKS_HOST == None or DATABRICKS_SQL_PATH == None:
+        raise ValueError("DATABRICKS_HOST and DATABRICKS_SQL_PATH environment variables must be set")
+
+    @render.data_frame
+    def result():
+        query = "SELECT * FROM samples.nyctaxi.trips LIMIT 10;"
+
+        with sql.connect(
+            server_hostname=DATABRICKS_HOST,
+            http_path=DATABRICKS_SQL_PATH,
+            auth_type="databricks-oauth",
+            credentials_provider=credentials_provider,
+        ) as connection:
+            with connection.cursor() as cursor:
+                cursor.execute(query)
+                rows = cursor.fetchall()
+                df = pd.DataFrame(
+                    rows, columns=[col[0] for col in cursor.description]
+                )
+                return df
+
+    @render.text
+    def text():
+        cfg = Config(
+            host=DATABRICKS_HOST_URL, credentials_provider=credentials_provider
+        )
+        databricks_user_info = CurrentUserAPI(ApiClient(cfg)).me()
+        return f"Hello, {databricks_user_info.display_name}!"
+
+
+app = App(app_ui, server)

local/python-oauth-databricks-app/manifest.json

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+{
+  "version": 1,
+  "locale": "en_US.UTF-8",
+  "metadata": {
+    "appmode": "python-shiny",
+    "entrypoint": "app"
+  },
+  "python": {
+    "version": "3.11.3",
+    "package_manager": {
+      "name": "pip",
+      "version": "22.3.1",
+      "package_file": "requirements.txt"
+    }
+  },
+  "files": {
+    "requirements.txt": {
+      "checksum": "358e0c8dab918144b22f1e48e5632eef"
+    },
+    "app.py": {
+      "checksum": "806a715aff9e0145e73f61db6d3f9d9c"
+    }
+  }
+}

local/python-oauth-databricks-app/requirements.txt

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+databricks-sql-connector==3.0.1
+databricks-sdk==0.20.0
+numpy<2.0.0
+posit-sdk==0.2.2
+shiny==0.7.1