Create Pre-Signed URLs - Cloud Storage

Creating pre-signed URLs varies slightly between different cloud storage services. Below are examples for Amazon S3, Google Cloud Storage, and Azure Blob Storage:

1. Amazon S3

   For Amazon S3, you can use the AWS SDK for Python (Boto3) to generate pre-signed URLs. Below is an example:

   pythonCopy code
   import boto3
   from botocore.exceptions import NoCredentialsError
   
   def create_presigned_url(bucket_name, object_name, expiration=300):
       s3_client = boto3.client('s3')
       try:
           response = s3_client.generate_presigned_url('get_object',
                                                       Params={'Bucket': bucket_name,
                                                               'Key': object_name},
                                                       ExpiresIn=expiration)
       except NoCredentialsError:
           print("No credentials available")
           return None
       return response
   

   This script generates a pre-signed URL that will remain valid for 5 minutes (300 seconds).

2. Google Cloud Storage

   For Google Cloud Storage, you can use the Google Cloud SDK for Python to generate pre-signed URLs. Here is an example:

   pythonCopy code
   from google.cloud import storage
   import datetime
   
   def generate_download_signed_url_v4(bucket_name, blob_name):
       storage_client = storage.Client()
       bucket = storage_client.bucket(bucket_name)
       blob = bucket.blob(blob_name)
   
       url = blob.generate_signed_url(
           version="v4",
           expiration=datetime.timedelta(minutes=5),
           method="GET")
   
       return url
   

   This script generates a v4 pre-signed URL for downloading a blob. The URL will remain valid for 5 minutes.

3. Azure Blob Storage

   For Azure Blob Storage, you can use the Azure Storage SDK for Python to generate pre-signed URLs. Below is an example:

   pythonCopy code
   from azure.storage.blob import BlobServiceClient, BlobSasPermissions, generate_blob_sas
   from datetime import datetime, timedelta
   
   def generate_sas_url(account_name, account_key, container_name, blob_name):
       blob_service_client = BlobServiceClient(account_url=f"https://{account_name}.blob.core.windows.net", credential=account_key)
       sas_token = generate_blob_sas(
           blob_service_client.account_name,
           container_name,
           blob_name,
           account_key=account_key,
           permission=BlobSasPermissions(read=True),
           expiry=datetime.utcnow() + timedelta(minutes=5)
       )
       return f"https://{account_name}.blob.core.windows.net/{container_name}/{blob_name}?{sas_token}"
   

   This script generates a SAS URL that will remain valid for 5 minutes.

Remember to replace the placeholders (bucket_name, object_name etc.) with your actual bucket details and file path.

Also, for all the examples to work, you must have the necessary credentials configured in your environment.