Implement to store encrypted data in MongoDB

[jihyungSong]

Discussed in cloudforet-io/cloudforet#69

^{Originally posted by jihyungSong December 7, 2022}
Propose Date : 2022-11-17
Proposer : @jihyungSong

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Currently, Cloudforet is to store sensitive data such as the user's Access Key in a more safety way through the Secret micro service.
(https://github.com/cloudforet-io/secret)

About the Secret service, it is supported using various backend systems.

• AWS Secrets Manager
• Consul by Hashicorp
• Vault by Hashicorp
• etcd of CNCF

I suggest to add MongoDB as a backend for Secret service.
(https://www.mongodb.com/)

Mongodb is the most influential database for storing documents based, and it is also used as a database for Cloudforet, so it is easy to integrate.

However, since it is not encrypted when stored in MongoDB, additional implementation of the encryption handler in the Secret service will be inevitable.

[jihyungSong]

According to this cloudforet-io/cloudforet#69, new Connector that can use MongoDB as a backend storage for secret data has been integrated.

To use MongoDBConnector, add MongoDB connection information to config as follows.
Additionally, you specify a MongoDBConnector as BACKEND .

BACKEND: MongoDBConnector
CONNECTORS:
    MongoDBConnector:
        host: MONGO_HOST
        port': 27017,
        username': MONGO_USER,
        password': MONGO_PASSWD