aws s3 presigned url

presigned.rb

require 'aws-sdk-s3'

# Configure AWS Credentials (using environment variables is recommended)
Aws.config.update({
  region: 'YOUR_AWS_REGION', # e.g., 'us-west-2'
  credentials: Aws::Credentials.new(ENV['AWS_ACCESS_KEY_ID'], ENV['AWS_SECRET_ACCESS_KEY'])
})

# S3 Bucket and Object Details
bucket_name = 'YOUR_S3_BUCKET_NAME'
object_key  = 'path/to/your/object.pdf' # The path of the object in your S3 bucket

# Create an S3 Client
s3 = Aws::S3::Client.new

# Generate a Pre-signed URL
begin
  presigned_url = s3.presigner.presigned_url(
    :get_object,  # Operation to perform (in this case, get the object)
    bucket: bucket_name,
    key: object_key,
    expires_in: 3600,       # Link expires in 1 hour (3600 seconds)
    response_content_disposition: "attachment;filename=\"downloaded_file.pdf\"", #Forces download
    response_content_type: "application/pdf" #Sets the correct content type

  )
  puts "Pre-signed URL: #{presigned_url}"
  # if its a rails controller
  # redirect_to presigned_url  

rescue Aws::S3::Errors::NoSuchBucket => e
  puts "Error: Bucket '#{bucket_name}' does not exist."
rescue Aws::S3::Errors::NoSuchKey => e
    puts "Error: Object '#{object_key}' does not exist in bucket '#{bucket_name}'."
rescue StandardError => e
  puts "An error occurred: #{e.message}"
end