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app.py
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app.py
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"""
Main entry point for this example app
"""
import logging
import os
import requests
from dotenv import load_dotenv
from flask import Flask, jsonify, render_template
from yarl import URL
load_dotenv()
app = Flask(__name__)
# Load environment variables from the .env file
app.config.from_mapping(
{
"API_TOKEN": os.environ.get("API_TOKEN"),
"API_SECRET": os.environ.get("API_SECRET"),
"DASHBOARD_ID": os.environ.get("DASHBOARD_ID"),
"SUPERSET_DOMAIN": os.environ.get("SUPERSET_DOMAIN"),
"PRESET_TEAM": os.environ.get("PRESET_TEAM"),
"WORKSPACE_SLUG": os.environ.get("WORKSPACE_SLUG"),
"PRESET_BASE_URL": URL("https://api.app.preset.io/"),
},
)
# Configure logging
logging.basicConfig(
level=logging.DEBUG,
format="%(asctime)s:%(levelname)s:%(message)s",
handlers=[logging.StreamHandler()],
)
@app.route("/")
def main_page():
"""
Default route to load index.html (loads the Embedded SDK).
"""
return render_template(
"index.html",
dashboardId=app.config["DASHBOARD_ID"],
supersetDomain=app.config["SUPERSET_DOMAIN"],
)
@app.route("/guest-token", methods=["GET"])
def guest_token_generator():
"""
Route used by frontend to retrieve a Guest Token.
"""
try:
jwt_token = authenticate_with_preset()
guest_token = jsonify(fetch_guest_token(jwt_token))
return guest_token, 200
except requests.exceptions.HTTPError as error:
return jsonify({"error": str(error)}), 500
def authenticate_with_preset():
"""
Authenticate with the Preset API to generate a JWT token.
"""
url = app.config["PRESET_BASE_URL"] / "v1/auth/"
payload = {"name": app.config["API_TOKEN"], "secret": app.config["API_SECRET"]}
headers = {"Content-Type": "application/json", "Accept": "application/json"}
try:
response = requests.post(
url,
headers=headers,
json=payload,
timeout=7,
)
response.raise_for_status()
return response.json()["payload"]["access_token"]
except requests.exceptions.HTTPError as http_error:
error_msg = http_error.response.text
logging.error(
"\nERROR: Unable to generate a JWT token.\nError details: %s",
error_msg,
)
raise requests.exceptions.HTTPError(
"Unable to generate a JWT token. "
"Please make sure your API key is enabled.",
)
def fetch_guest_token(jwt):
"""
Fetch and return a Guest Token for the embedded dashboard.
"""
url = (
app.config["PRESET_BASE_URL"]
/ "v1/teams"
/ app.config["PRESET_TEAM"]
/ "workspaces"
/ app.config["WORKSPACE_SLUG"]
/ "guest-token/"
)
payload = {
"user": {"username": "test_user", "first_name": "test", "last_name": "user"},
"resources": [{"type": "dashboard", "id": app.config["DASHBOARD_ID"]}],
"rls": [
# Apply an RLS to a specific dataset
# { "dataset": dataset_id, "clause": "column = 'filter'" },
# Apply an RLS to all datasets
# { "clause": "column = 'filter'" },
],
}
headers = {
"Authorization": f"Bearer {jwt}",
"Accept": "application/json",
"Content-Type": "application/json",
}
try:
response = requests.post(
url,
headers=headers,
json=payload,
timeout=7,
)
response.raise_for_status()
return response.json()["payload"]["token"]
except requests.exceptions.HTTPError as http_error:
error_msg = http_error.response.text
logging.error(
"\nERROR: Unable to fetch a Guest Token.\nError details: %s",
error_msg,
)
raise requests.exceptions.HTTPError(
"Unable to generate a Guest token. "
"Please make sure the API key has admin access and the payload is correct.",
)
if __name__ == "__main__":
app.run(host="0.0.0.0")