Exploring the Functions of JavaScript with Google's Cloud Storage

Question

Exploring the Functions of JavaScript with Google's Cloud Storage

I have been attempting to upload images into buckets on Google Cloud Storage using the JSON API and the Javascript sample provided in the documentation.

Although I am able to successfully upload pictures, I am encountering an issue where it prompts me to log in to my Google account.

The Javascript sample includes an Authorization button that handles OAuth credentials, but I want to authenticate without having to manually log in. My client does not have access to the necessary email or password, so I need it to be automatic.

Is there a way for me to achieve this?

Thank you!

-----------------------------UPDATE--------------------

In response to Brandon's suggestion, I have implemented the following:

I have created and signed my policy document as shown below:

[Code snippet demonstrating policy creation and signing]

And here is my post form:

[Code snippet detailing the form submission]

Despite various attempts with different combinations in the Javascript code, I am struggling to determine what should be placed in the `policy` and `signature` fields. The API documentation is unclear on this matter.

Whenever I try different values in these fields, such as PolicyJson64 or sig, I encounter the following error:

[Error message indicating SignatureDoesNotMatch]

Can anyone provide guidance on what should be entered in these fields?

------UPDATE------

Please refrain from providing unhelpful copy-paste solutions from the documentation. A bounty has been added for assistance.

javascript json cloud storage google-cloud-storage

Answer 1

Answer №1

When it comes to uploading an object, obtaining authorization is a crucial step (creating a bucket for completely anonymous writes is not typically recommended). There are various methods available to acquire this authorization.

One effective way, as you have discovered, is to have users sign in with their Google accounts to grant authorization. This approach works well for applications intended for a specific group of known individuals.

Another option for uploading images is to utilize signed URLs or signed form policy documents. These tools enable users to employ a standard HTML form to select and upload an image that has already been pre-authorized by your application. The policy document is a brief text outlining the user's permissions and is signed using appropriate credentials.

An example of a policy document could look like this:

{"expiration": "2010-06-16T11:11:11Z",
 "conditions": [
    ["starts-with", "$key", "" ],
    {"acl": "bucket-owner-read" },
    {"bucket": "travel-maps"},
    {"success_action_redirect": "http://www.example.com/success_notification.html" },
    ["eq", "$Content-Type", "image/jpeg" ],
    ["content-length-range", 0, 1000000]
  ]
}

This policy specifies restrictions such as only allowing uploads with bucket-owner-read ACL, limiting uploads to the bucket "travel-maps," restricting objects to a maximum size of 1 megabyte, and so forth. Subsequently, the server would sign this document using a secret key. The document (in base64) along with its signature would be included in the HTML form:

The method of utilizing a signed URL differs from a signed form. "Signed URLs" are precise, predefined commands that execute precisely as stated. While they can be used for uploads, they lack the flexibility of signed policy documents.

Answer 2

When it comes to uploading an object, obtaining authorization is a crucial step (creating a bucket for completely anonymous writes is not typically recommended). There are various methods available to acquire this authorization.

One effective way, as you have discovered, is to have users sign in with their Google accounts to grant authorization. This approach works well for applications intended for a specific group of known individuals.

Another option for uploading images is to utilize signed URLs or signed form policy documents. These tools enable users to employ a standard HTML form to select and upload an image that has already been pre-authorized by your application. The policy document is a brief text outlining the user's permissions and is signed using appropriate credentials.

An example of a policy document could look like this:

{"expiration": "2010-06-16T11:11:11Z",
 "conditions": [
    ["starts-with", "$key", "" ],
    {"acl": "bucket-owner-read" },
    {"bucket": "travel-maps"},
    {"success_action_redirect": "http://www.example.com/success_notification.html" },
    ["eq", "$Content-Type", "image/jpeg" ],
    ["content-length-range", 0, 1000000]
  ]
}

This policy specifies restrictions such as only allowing uploads with bucket-owner-read ACL, limiting uploads to the bucket "travel-maps," restricting objects to a maximum size of 1 megabyte, and so forth. Subsequently, the server would sign this document using a secret key. The document (in base64) along with its signature would be included in the HTML form:

The method of utilizing a signed URL differs from a signed form. "Signed URLs" are precise, predefined commands that execute precisely as stated. While they can be used for uploads, they lack the flexibility of signed policy documents.

Answer 3

Answer №2

Since Google Cloud Storage lacked a straightforward method for uploading images back in 2014, I turned to Amazon Web Services which conveniently offers NodeJS Sample Code. It's user-friendly and uncomplicated.

http://aws.amazon.com/es/developers/getting-started/nodejs/

To get started, follow these steps:

git clone https://github.com/awslabs/aws-nodejs-sample.git

Next, install the necessary dependencies:

npm install

After installation is complete, run the sample:

node sample.js

The sample includes instructions for using buckets and storing files within them. Simply ensure you update your credentials accordingly:

aws_access_key_id = YOUR_ACCESS_KEY_ID
aws_secret_access_key = YOUR_SECRET_ACCESS_KEY

Enjoy!

Answer 4

Since Google Cloud Storage lacked a straightforward method for uploading images back in 2014, I turned to Amazon Web Services which conveniently offers NodeJS Sample Code. It's user-friendly and uncomplicated.

http://aws.amazon.com/es/developers/getting-started/nodejs/

To get started, follow these steps:

git clone https://github.com/awslabs/aws-nodejs-sample.git

Next, install the necessary dependencies:

npm install

After installation is complete, run the sample:

node sample.js

The sample includes instructions for using buckets and storing files within them. Simply ensure you update your credentials accordingly:

aws_access_key_id = YOUR_ACCESS_KEY_ID
aws_secret_access_key = YOUR_SECRET_ACCESS_KEY

Enjoy!

Exploring the Functions of JavaScript with Google's Cloud Storage

Answer №1

Answer №2

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