https://github.com/emvi/hide

A Go type to prevent internal numeric IDs from being exposed to clients using HashIDs and JSON.
https://github.com/emvi/hide

golang id json type

Last synced: about 2 months ago
JSON representation

A Go type to prevent internal numeric IDs from being exposed to clients using HashIDs and JSON.

• Host: GitHub
• URL: https://github.com/emvi/hide
• Owner: emvi
• License: mit
• Created: 2019-01-16T13:54:17.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2021-11-09T19:21:48.000Z (almost 3 years ago)
• Last Synced: 2024-06-19T20:48:46.450Z (3 months ago)
• Topics: golang, id, json, type
• Language: Go
• Homepage:
• Size: 287 KB
• Stars: 67
• Watchers: 5
• Forks: 6
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-go - hide - ID type with marshalling to/from hash to prevent sending IDs to clients. (Data Structures and Algorithms / Miscellaneous Data Structures and Algorithms)
• awesome-ccamel - emvi/hide - A Go type to prevent internal numeric IDs from being exposed to clients using HashIDs and JSON. (Go)
• awesome-go - hide - ID type with marshalling to/from hash to prevent sending IDs to clients. (Data Structures and Algorithms / Miscellaneous Data Structures and Algorithms)
• awesome-go-extra - hide - 01-16T13:54:17Z|2021-11-09T19:21:48Z| (Generators / Miscellaneous Data Structures and Algorithms)

README

        
# Hide IDs

[![Go Reference](https://pkg.go.dev/badge/github.com/emvi/hide?status.svg)](https://pkg.go.dev/github.com/emvi/hide?status)

[![Go Report Card](https://goreportcard.com/badge/github.com/emvi/hide)](https://goreportcard.com/report/github.com/emvi/hide)



Hide is a simple package to provide an ID type that is marshaled to/from a hash string.

This prevents sending technical IDs to clients and converts them on the API layer.

Hide uses [hashids](https://github.com/speps/go-hashids) as its default hash function.

But you can provide your own by implementing the `Hash` interface and configuring it using `hide.UseHash`.

[Read our full article on Medium.](https://medium.com/emvi/golang-transforming-ids-to-a-userfriendly-representation-in-web-applications-85bf2f7d71c5)

## Installation

```

go get github.com/emvi/hide/v2

```

## Example

Consider the following struct:

```

type User struct {

    Id       int64  `json:"id"`

    Username string `json:"username"`

}

```

When marshaling this struct to JSON, the ID will be represented by a number:

```

{

    "id": 123,

    "username": "foobar"

}

```

In this case, you expose the technical user ID to your clients. By changing the type of the ID, you get a better result:

```

type User struct {

    Id       hide.ID `json:"id"`

    Username string  `json:"username"`

}

```

Notice that the `int64` ID got replaced by the `hide.ID`, which internally is represented as an `int64` as well, but implements the marshal interface.

This allows you to cast between them and use `hide.ID` as a replacement. The resulting JSON changes to the following:

```

{

  "id": "beJarVNaQM",

  "username": "foobar"

}

```

If you send the new ID (which is a string now) back to the server and unmarshal it into the `hide.ID` type, you'll get the original technical ID back.

It's also worth mentioning that a value of 0 is translated to `null` when an ID is marshaled to JSON or stored in a database.

[View the full demo](https://github.com/emvi/hide-example)

## Contribute

[See CONTRIBUTING.md](CONTRIBUTING.md)

## License

MIT