You can authenticate with Google Cloud Storage to create your own instance of the Google Cloud Storage connector through the UI or through APIs. Once authenticated, you can use the connector instance to access the different functionalities offered by the Google Cloud Storage platform.

Authenticate Through the UI

Use the UI to authenticate with Google Cloud Storage and create a connector instance. Because you authenticate with Google Cloud Storage via OAuth 2.0, all you need to do is add a name for the instance and provide your OAuth API Key and API Secret. After you create the instance, you'll log in to Google to authorize SAP Open Connectors access your account. For more information about authenticating a connector instance, see Authenticate a Connector Instance (UI). 

After successfully authenticating, we give you several options for next steps. Make requests using the API docs associated with the instance, map the instance to a common resource, or use it in a formula template. 

Authenticate Through API

Authenticating through API is similar to authenticating via the UI. Instead of clicking and typing through a series of buttons, text boxes, and menus, you will instead send a request to our /instances endpoint. The end result is the same: an authenticated connector instance with a token and id.

Authenticating through API follows a multi-step OAuth 2.0 process that involves:

• Getting a redirect URL. This URL sends users to the vendor to log in to their account.
• Authenticating users and receiving the authorization grant code. After the user logs in, the vendor makes a callback to the specified url with an authorization grant code.
• Authenticating the connector instance. Using the authorization code from the vendor, authenticate with the vendor to create a connector instance at SAP Open Connectors.

Getting a Redirect URL

Use the following API call to request a redirect URL where the user can authenticate with the API provider. Replace {keyOrId} with the connector key, googlecloudstorage.

curl -X GET /Connectors/{keyOrId}/oauth/url?apiKey=<api_key>&apiSecret=<api_secret>&callbackUrl=<url>

Query Parameters

Example cURL

curl -X GET \
  'https://api.openconnectors.us2.ext.hana.ondemand.com/elements/api-v2/elements/googlecloudstorage/oauth/url?apiKey=fake_api_key&apiSecret=fake_api_secret&callbackUrl=https://www.mycoolapp.com/auth&state=googlecloudstorage' \

Example Response

Use the oauthUrl in the response to allow users to authenticate with the vendor.

{
  "oauthUrl": "https://accounts.google.com/o/oauth2/auth?prompt=consent&access_type=offline&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fdevstorage.full_control&response_type=code&redirect_uri=https%3A%2F%2Fauth.cloudelements.io%2Foauth&state=googlecloudstorage-dupe&client_id=10011628760-n0j35qr3ietmgse1cgavcngaubq06anm.apps.googleusercontent.com",
  "element": "googlecloudstorage"
}

Authenticating Users and Receiving the Authorization Grant Code

Provide the response from the previous step to the users. After they authenticate, Google Cloud Storage provides the following information in the response:

• code
• state

Authenticating the Connector Instance

Use the /instances endpoint to authenticate with Google Cloud Storage and create a connector instance.

To authenticate a connector instance:

1. Construct a JSON body as shown below (see Parameters):

   {
     "element": {
       "key": "googlecloudstorage"
     },
     "name": "<INSTANCE_NAME>",
     "providerData": {
       "code": "XXXXXXXXXXXXXXXXXXXXXXX"
     },
     "configuration": {
       "filter.response.nulls": "true",
       "filemanagement.provider.bucket_name": "XXXXXXXXXXXX",
       "oauth.api.key": "XXXXXXXXXXXX",
       "oauth.api.secret": "XXXXXXXXXXX",
       "project.id": "XXXXXXXXXXXXX",
       "oauth.callback.url": "https://auth.cloudelements.io/oauth"
     }
   }

2. Call the following, including the JSON body you constructed in the previous step:

   POST /instances
   

   Note: Make sure that you include the User and Organization keys in the header. For more information, see Authorization Headers, Organization Secret, and User Secret.

3. Locate the token and id in the response and save them for all future requests using the connector instance.

Example cURL

curl -X POST https://api.openconnectors.us2.ext.hana.ondemand.com/elements/api-v2/instances \
 -H "Authorization: User <USER_SECRET>, Organization <ORGANIZATION_SECRET>"  \
 -H "Content-Type: application/json"  \
-d 
'{
  "name": "<INSTANCE_NAME>",
  "tags": [
    "xxxxxxxxx"
  ],
  "providerData": {
    "code": "<INSERT>"
  },
  "configuration": {
    "filter.response.nulls": "true",
    "filemanagement.provider.bucket_name": "XXXXXXXXXXXX",
    "oauth.api.key": "xxxxxxxxxxxx ",
    "oauth.api.secret": "xxxxxxxxxx",
    "project.id": "xxxxxxxxxxxxx"
  }
}'

Parameters

API parameters not shown in SAP Open Connectors are in code formatting.

Example Response for an Authenticated Connector Instance

In this example, the instance ID is 12345 and the instance token starts with "ABC/D...". The actual values returned to you will be unique: make sure you save them for future requests to this new instance.

{
  "id": 12345,
  "name": "Google Cloud Storage",
  "key": "googlecloudstorage",
  "description": "Google Cloud Storage is a Restful online file storage web service for storing and accessing data on Google Cloud Platform infrastructure.",
  "image": "https://images.cloudelements.io/google-cloud-storage201908151321.png",
  "logo": "gcstorage",
  "active": true,
  "deleted": false,
  "typeOauth": false,
  "trialAccount": false,
  "configuration": [
          {
      "id": 300511,
      "name": "OAuth Scope",
      "key": "oauth.scope",
      "description": "Google Cloud Storage OAuth Scope",
      "defaultValue": "https://www.googleapis.com/auth/devstorage.full_control",
      "resellerConfig": false,
      "companyConfig": false,
      "active": true,
      "internal": false,
      "groupControl": false,
      "displayOrder": 1,
      "type": "TEXTFIELD_64",
      "hideFromConsole": true,
      "required": false
    }...
  ],
  "resources": [...],
  "objects": [...],
  "models": [...],
  "transformationsEnabled": true,
  "bulkDownloadEnabled": false,
  "bulkUploadEnabled": false,
  "cloneable": true,
  "extendable": false,
  "beta": false,
  "authentication": {...},
  "hooks": [...],
  "extended": false,
  "modelType": "basic",
  "useModelsForMetadata": true,
  "hub": "documents",
  "protocolType": "http",
  "parameters": [...],
  "private": true
}