import datetime

from google.cloud import storage


"""Generates a v4 signed URL for uploading a blob using HTTP PUT.

Note that this method requires a service account key file. You can not use
this if you are using Application Default Credentials from Google Compute
Engine or from the Google Cloud SDK.
"""
# bucket_name = 'your-bucket-name'
# blob_name = 'your-object-name'

# storage_client = storage.Client()
# cred = credentials.Certificate('servicekey.json')
storage_client = storage.Client.from_service_account_json("servicekey.json"); 
bucket_name = 'farmbase-b2f7e.appspot.com'
bucket = storage_client.bucket(bucket_name)
blob = bucket.blob('DroneData')

url = blob.generate_signed_url(
    version="v4",
    # This URL is valid for 15 minutes
    expiration=datetime.timedelta(minutes=1500),
    # Allow PUT requests using this URL.
    method="PUT",
    content_type="application/octet-stream",
)

print("Generated PUT signed URL:")
print(url)
print("You can use this URL with any user agent, for example:")
print(
    "curl -X PUT -H 'Content-Type: application/octet-stream' "
    "--upload-file my-file '{}'".format(url)
)
print(url)

#####different way using credentials to create the url######

# import os, google.auth
# from google.auth.transport import requests
# from google.auth import compute_engine
# from datetime import datetime, timedelta
# from google.cloud import storage

# auth_request = requests.Request()
# credentials, project = google.auth.default()
# storage_client = storage.Client(project, credentials)
# bucket_name = 'farmbase-b2f7e.appspot.com'
# data_bucket = storage_client.bucket(bucket_name)
# # data_bucket = storage_client.lookup_bucket(os.getenv("BUCKET_NAME"))
# signed_blob_path = data_bucket.blob("DroneData")
# expires_at_ms = datetime.now() + timedelta(minutes=1500)
# # This next line is the trick!
# signing_credentials = compute_engine.IDTokenCredentials(auth_request, "", service_account_email=credentials.service_account_email)
# signed_url = signed_blob_path.generate_signed_url(expires_at_ms, credentials=signing_credentials, version="v4")