CreateC2paSignTask - AI DeepSign - Alibaba Cloud Documentation Center

Operation description

Signing types

Basic signing: Signs content with a platform-owned certificate and supports content integrity verification.
Trusted signing: In addition to integrity verification, the signing certificate chain can be validated against the C2PA official trust list.

This operation provides trusted signing. To perform basic signing on an image, call SignUserImage.

Request description

This operation adds a C2PA trusted signature to a specified single JPEG/JPG, PNG, or MP4 file and generates Content Credentials.
A successful creation only indicates that the request has been accepted, not that the file has been signed. Save the returned TaskId and call GetC2paSignResult to query the final result.
FileUrl must be an absolute HTTP or HTTPS address accessible by the service and must not contain a URL user info component.
Query parameters in the URL do not affect file name recognition. For example, https://example.com/media/demo.mp4?token=xxx is recognized as demo.mp4.
The service does not follow HTTP 3xx redirects. The source address must directly return an HTTP 200 status code.
The maximum file size is 800 MiB. The actual limit is based on the number of bytes read, not the Content-Length in the response header.
The actual signable range for JPEG, PNG, and MP4 files depends on the backend configuration. Currently, files up to 800 MiB are supported.
Business parameters are passed through URL query parameters. POP supports both GET and POST methods, but the generated Go client uses the GET method.
After a task is successfully created, the file download, staging, or signing process may still fail asynchronously. Retrieve detailed error information by calling GetC2paSignResult.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

aideepsign:CreateC2paSignTask

create

*All Resource

*

None

Request parameters

Parameter	Type	Required	Description	Example
FileUrl	string	Yes	The absolute HTTP or HTTPS address of the JPEG or PNG file to be signed. The address can be up to 4,096 characters in length.	https://example.com/images/photo.png?token=xxx
SourceType	string	No	Not supported in the current version.	trainedAlgorithmicMedia
SoftwareAgent	string	No	Not supported in the current version.	Alibaba Cloud Qwen ImageGen

Response elements

Element	Type	Description	Example
	object	The task creation result.
RequestId	string	The request ID of this API call.	A1B2C3D4-E5F6-7890-ABCD-EF1234567890
TaskId	string	The opaque task ID generated by the service. Use this ID to call GetC2paSignResult.	7093c29e-f472-4e1e-91c6-a43df7c7382e
Success	boolean	Indicates whether the API call was successful.	True
Message	string	The additional information. The value success is returned if the request was successful.	success
HttpStatusCode	integer	The HTTP status code. The value 200 is returned if the request was successful.	200
Code	string	The business error code. The value OK is returned if the request was successful.	OK

Examples

Success response

JSON format

{
  "RequestId": "A1B2C3D4-E5F6-7890-ABCD-EF1234567890",
  "TaskId": "7093c29e-f472-4e1e-91c6-a43df7c7382e",
  "Success": true,
  "Message": "success",
  "HttpStatusCode": 200,
  "Code": "OK"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.