Why is my custom async authenticate for Solapi API credentials not working in n8n v1.80.3?

Hello,

I developed a custom credential for the Solapi API that uses an async authenticate function. This implementation works well in n8n version 1.68.1, but in later versions (1.78.0 and 1.80.3) the credential type is not visible in the HTTP Request node's authentication settings (under Predefined Credential Type).

Steps followed:

1. Solapi API credentials are created successfully.
2. A workflow with an HTTP Request node is created.
3. In the node's authentication settings, under Predefined Credential Type:
   • In version 1.68.1: the credential type “Solapi API” is visible and selectable.
   • In version 1.80.3: “Solapi API” is missing and cannot be used.

It appears that async authenticate might no longer be supported or functioning as expected in the latest versions. Has anyone encountered this issue before?

Below is the code for the custom credential:

TYPESCRIPTCopied
import {
        IAuthenticateGeneric,
        ICredentialTestRequest,
        ICredentialType,
        INodeProperties,
        ICredentialDataDecryptedObject,
        IHttpRequestHelper,
        IHttpRequestOptions
} from 'n8n-workflow';
import * as crypto from 'crypto'

export class AllabuSolapiKakaoApi implements ICredentialType {
        name = 'allabusolapikakaoApi';
        displayName = 'Solapi API';
        properties: INodeProperties[] = [
                {
                        displayName: 'API KEY',
                        name: 'apiKey',
                        type: 'string',
                        typeOptions: {
                                password: false,
                        },
                        default: '',
                },
                {
                        displayName: 'API secret',
                        name: 'apiSecret',
                        type: 'string',
                        typeOptions: {
                                password: true,
                        },
                        default: '',
                },
        ];

        // HERE!!! authenticate doesn't work in n8n v1.80.3
        async authenticate(
                credentials: ICredentialDataDecryptedObject,
                requestOptions: IHttpRequestOptions,
        ): Promise<IHttpRequestOptions> {

            console.log('preAuthenticate called with credentials:', credentials);
            const apiKey = credentials.apiKey;
            const salt = 'jqsba2jxjnrjor'; //crypto.randomBytes(16).toString('hex');
            const dateTime = new Date().toISOString();
            const signatureString =  dateTime + salt;

            const apiSecret = String(credentials.apiSecret);
            const signature = crypto.createHmac('sha256', apiSecret).update(signatureString).digest('hex');

            const authString = 'HMAC-SHA256 apiKey=' + apiKey  + ', date=' + dateTime + ', salt=' + salt + ', signature=' + signature;
            console.log('authString: ', authString);

//              requestOptions.headers!.Authorization = authString;
                requestOptions.headers = {
                        Accept: 'application/json',
                        'X-Ninja-Token': authString,
                };
                return requestOptions;
        }

/*  not using
        authenticate: IAuthenticateGeneric = {
                type: 'generic',
                properties: {
                        // This will be set dynamically in the `preAuthenticate` function
                        headers: {
                            'Authorization': 'authString',
                        },
                },
        };
not using */
}

Any insights or workarounds would be greatly appreciated. Thanks for reading!