Google Cloud Storage Presigned URL can act as a useful tool. Media files stored on Google Cloud Storage can be used directly in media workflows. If the media is already on cloud storage, then process it to generate pre-signed URLs.

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Let us take a look at google cloud storage presigned URL in detail

Google Cloud Storage with Pre-Signed URLs

There are several ways to accomplish this in media workflows.

Using gs:// URLs

Using GCP Service Account Credentials gs:/ as an input/output parameter is currently not supported for google cloud storage. A validation error will appear. Create a pre-signed URL instead, as described below.

Pre-Signed URLs

A pre-signed URL is a simple way to provide a URL with temporary credentials as a basic string. When reading media, the APIs must GET the input parameter and PUT on the output parameter. To request with pre-signed URLs, generate a separate string for each parameter first. This is the first step to google cloud storage with presigned url.

Generate pre-signed URLs

Only those who have access to the object/file being shared can generate Pre-signed URLs. Furthermore, cloud providers provide a variety of methods for generating such URLs, including console, command line, and programmatic methods. There may be some differences in terminology used by cloud providers when referring to this, but the overall concept is the same. For Google cloud storage it can be done in the following way:

For GCP, generate it using a command line tool, but keep in mind that it can also be done programmatically.

1. Firstly Install the latest GCP SDK for maximum google cloud storage accessibility.
2. After the successful SDK installation,  it will launch the command and configure the account for the first time.
3. The next step is to use the storage service console to create a bucket and then upload the file to that bucket.
4. Create one service account, assign a storage admin role to it, and generate a private key (JSON) for it, which you should keep safe on your local machine.
5. Finally, use the GCP command line tool to generate a signed URL for downloading a file and save the link for later use.

   gsutil signurl -d 30m gs://bucket/object
6. Similarly, use the following command to generate an upload url (c-type = content type).

   gsutil signurl -m PUT -d 1h -c gs://bucket/object

Setting up GCP Authentication

To ensure that the GCP API calls work properly, set GOOGLE APPLICATION CREDENTIALS either at runtime or in the environment variables as noted in the comments of the scripts below.

Here are some examples of how to accomplish this:

Downloading a File

pip install google-cloud-storageimportdatetimeimportosfromgoogle.
cloudimportstoragedefgenerate_download_signed_url_
v4(bucket_name, blob_name): Creates a v4 signed URL for blob download. Be aware that a service account key file is necessary for this method.

Application default credentials from Google Compute Engine or the Google Cloud SDK are unaccessible. If the user has no authentication file set to an environment variable ["GOOGLE APPLICATION CREDENTIALS"] =".json"storage client=storage.Client()

bucket=storage_client.bucket(bucket_name) blob=bucket.blob(blob_name)

url=blob.generate_signed_url(
version="v4",) The URL is valid 15 minutesexpiration=datetime.timedelta(minutes=15), Allow GET requests using this URL.method=”GET”,

print("Generated GET signed URL:")
print(url)
print("You can use this URL with any user agent, for example:")
print("curl '{}'".format(url)) returnurlgenerate_download_signed_url_v4('your-bucket-name', 'filename.mp3')

Uploading a File

Install the google cloud storage # pip install google-cloud-storage
import datetime
import os
from google.cloud import storage def generate_upload_signed_url_v4(bucket_name, blob_name): """Generates a v4 signed URL for uploading a blob using HTTP PUT.

It is important to note that this method necessitates the use of a service account key file. If a user is using Application Default Credentials from Google Compute Engine or the Google Cloud SDK, they cannot use this.

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=15),
method="PUT",
)

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Conclusion

To conclude, Only users who have access to the object or file that they want to share can create pre-signed URLs. In the case of google cloud storage, a presigned url can generate from the media in the cloud storage.