# OAuth Providers Middleware

Authentication middleware for [Hono](https://github.com/honojs/hono). This package offers a straightforward API for social login with platforms such as Facebook, GitHub, Google, and LinkedIn.

## Installation

You can install `hono` and `@hono/oauth-providers` via npm.

```txt
npm i hono @hono/oauth-providers
```

## Usage

Open Auth simplifies the OAuth2 flow, enabling you to utilize social login with just a single method.
On every platform you choose to add to your project you have to add on its platform the **callback uri** or **redirect uri**. Open Auth handles the redirect uri internally as the route you are using the middleware on, so if you decide to use the google auth on the route `/api/v1/auth/google/` the redirect uri will be `DOMAIN/api/v1/auth/google`.

```ts
app.use(
  "api/v1/auth/google", // -> redirect_uri by default
  googleAuth({ ... })
)
```

Also, there is two ways to use this middleware:

```ts
app.use(
  '/google',
  googleAuth({
    client_id: Bun.env.GOOGLE_ID,
    client_secret: Bun.env.GOOGLE_SECRET,
    scope: ['openid', 'email', 'profile'],
  })
)

app.get('/google', (c) => {
  const token = c.get('token')
  const grantedScopes = c.get('granted-scopes')
  const user = c.get('user-google')

  return c.json({
    token,
    grantedScopes,
    user,
  })
})

export default app
```

Or

```ts
app.get(
  '/google',
  googleAuth({
    client_id: Bun.env.GOOGLE_ID,
    client_secret: Bun.env.GOOGLE_SECRET,
    scope: ['openid', 'email', 'profile'],
  }),
  (c) => {
    const token = c.get('token')
    const grantedScopes = c.get('granted-scopes')
    const user = c.get('user-google')

    return c.json({
      token,
      grantedScopes,
      user,
    })
  }
)

export default app
```

### Google

```ts
import { Hono } from 'hono'
import { googleAuth } from '@hono/oauth-providers/google'

const app = new Hono()

app.use(
  '/google',
  googleAuth({
    client_id: Bun.env.GOOGLE_ID,
    client_secret: Bun.env.GOOGLE_SECRET,
    scope: ['openid', 'email', 'profile'],
  })
)

export default app
```

#### Parameters

- `client_id`:
  - Type: `string`.
  - `Required`.
  - Your app client ID. You can find this value in the API Console [Credentials page](https://console.developers.google.com/apis/credentials). <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `GOOGLE_ID=`.
- `client_secret`:
  - Type: `string`.
  - `Required`.
  - Your app client secret. You can find this value in the API Console [Credentials page](https://console.developers.google.com/apis/credentials). <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `GOOGLE_SECRET=`.
    > Do not share your client secret to ensure the security of your app.
- `scope`:
  - Type: `string[]`.
  - `Required`.
  - Set of **permissions** to request the user's authorization to access your app for retrieving user information and performing actions on their behalf.<br /> Review all the scopes Google offers for utilizing their API on the [OAuth 2.0 Scopes page](https://developers.google.com/identity/protocols/oauth2/scopes).
    > If your app is not **verified** by Google, the accessible scopes for your app are significantly **limited**.
- `login_hint`:
  - Type: `string`.
  - `Optional`.
  - Set the parameter value to an email address or `sub` identifier to provide a hint to the Google Authentication Server who is asking for authentication.
- `prompt`:
  - Type: `string`.
  - `Optional`.
  - Define the prompt the user will receive when logging into their Google account. If not sent, the user will only be prompted the first time your project requests access. <br />Choose one of the following options:
    - `none`: Do not display any authentication or consent screens. Must not be specified with other values.
    - `consent`: Prompt the user for consent.
    - `select_account`: Prompt the user to select an account.

#### Authentication Flow

After the completion of the Google OAuth flow, essential data has been prepared for use in the subsequent steps that your app needs to take.

`googleAuth` method provides 3 set key data:

- `token`:
  - Access token to make requests to the google API for retrieving user information and performing actions on their behalf.
  - Type:
    ```
    {
      token: string
      expires_in: number
    }
    ```
- `granted-scopes`:
  - If the `include_granted_scopes` parameter was set to `true`, you can find here the scopes for which the user has granted permissions.
  - Type: `string[]`.
- `user-google`:
  - User basic info retrieved from Google
  - Type:
    ```
    {
      id: string
      email: string
      verified_email: boolean
      name: string
      given_name: string
      family_name: string
      picture: string
      locale: string
    }
    ```

To access this data, utilize the `c.get` method within the callback of the upcoming HTTP request handler.

```ts
app.get('/google', (c) => {
  const token = c.get('token')
  const grantedScopes = c.get('granted-scopes')
  const user = c.get('user-google')

  return c.json({
    token,
    grantedScopes,
    user,
  })
})
```

#### Revoke Token

In certain use cases, you may need to programmatically revoke a user's access token. In such scenarios, you can utilize the `revokeToken` method, which accepts the `token` to be revoked as its unique parameter.

```ts
import { googleAuth, revokeToken } from 'open-auth/google'

app.post('/remove-user', async (c, next) => {
  await revokeToken(USER_TOKEN)

  // ...
})
```

### Facebook

```ts
import { Hono } from 'hono'
import { facebookAuth } from '@hono/oauth-providers/facebook'

const app = new Hono()

app.use(
  '/facebook',
  facebookAuth({
    client_id: Bun.env.FACEBOOK_ID,
    client_secret: Bun.env.FACEBOOK_SECRET,
    scope: ['email', 'public_profile'],
    fields: [
      'email',
      'id',
      'first_name',
      'last_name',
      'middle_name',
      'name',
      'picture',
      'short_name',
    ],
  })
)

export default app
```

#### Parameters

- `client_id`:
  - Type: `string`.
  - `Required`.
  - Your app client ID. You can find this value in the App Dashboard [Dashboard page](https://developers.facebook.com/apps). <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `FACEBOOK_ID=`.
- `client_secret`:
  - Type: `string`.
  - `Required`.
  - Your app client secret. You can find this value in the App Dashboard [Dashboard page](https://developers.facebook.com/apps). <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `FACEBOOK_SECRET=`.
    > Do not share your client secret to ensure the security of your app.
- `scope`:
  - Type: `string[]`.
  - `Required`.
  - Set of **permissions** to request the user's authorization to access your app for retrieving user information and performing actions on their behalf.<br /> Review all the scopes Facebook offers for utilizing their API on the [Permissions page](https://developers.facebook.com/docs/permissions/).
    > If your app is not **verified** by Facebook, the accessible scopes for your app are significantly **limited**.
- `fields`:
  - Type: `string[]`.
  - Fields you request from the Facebook API to be sent once the user has logged in. You can find a comprehensive reference for all the fields you can request on the [Facebook User Reference page](https://developers.facebook.com/docs/graph-api/reference/user/#fields).

#### Authentication Flow

After the completion of the Facebook OAuth flow, essential data has been prepared for use in the subsequent steps that your app needs to take.

`facebookAuth` method provides 3 set key data:

- `token`:
  - Access token to make requests to the Facebook API for retrieving user information and performing actions on their behalf. It has a duration of 60 days.
  - Type:
    ```
    {
      token: string
      expires_in: number
    }
    ```
- `granted-scopes`:
  - If the `include_granted_scopes` parameter was set to `true`, you can find here the scopes for which the user has granted permissions.
  - Type: `string[]`.
- `user-facebook`:
  - User basic info retrieved from Facebook
  - Type:
    ```
    {
      id: string
      name: string
      email: string
      picture: {
        data: {
          height: number
          is_silhouette: boolean
          url: string
          width: number
        }
      }
      first_name: string
      last_name: string
      short_name: string
    }
    ```

To access this data, utilize the `c.get` method within the callback of the upcoming HTTP request handler.

```ts
app.get('/facebook', (c) => {
  const token = c.get('token')
  const grantedScopes = c.get('granted-scopes')
  const user = c.get('user-facebook')

  return c.json({
    token,
    grantedScopes,
    user,
  })
})
```

### GitHub

GitHub provides two types of Apps to utilize its API: the `GitHub App` and the `OAuth App`. To understand the differences between these apps, you can read this [article](https://docs.github.com/en/apps/creating-github-apps/about-creating-github-apps/deciding-when-to-build-a-github-app) from GitHub, helping you determine the type of App you should select.

#### Parameters

- `client_id`:
  - Type: `string`.
  - `Required`.
  - `Github App` and `Oauth App`.
  - Your app client ID. You can find this value in the [GitHub App settings](https://github.com/settings/apps) or the [OAuth App settings](https://github.com/settings/developers) based on your App type. <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `GITHUB_ID=`.
- `client_secret`:
  - Type: `string`.
  - `Required`.
  - `Github App` and `Oauth App`.
  - Your app client secret. You can find this value in the [GitHub App settings](https://github.com/settings/apps) or the [OAuth App settings](https://github.com/settings/developers) based on your App type. <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `GITHUB_SECRET=`.
    > Do not share your client secret to ensure the security of your app.
- `scope`:
  - Type: `string[]`.
  - `Required`.
  - `Oauth App`.
  - Set of **permissions** to request the user's authorization to access your app for retrieving user information and performing actions on their behalf.<br /> Review all the scopes Github offers for utilizing their API on the [Permissions page](https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/scopes-for-oauth-apps). <br />For `GitHub Apps`, you select the scopes during the App creation process or in the [settings](https://github.com/settings/apps).
- `oauthApp`:
  - Type: `boolean`.
  - `Required`.
  - `Oauth App`.
  - Set this value to `true` if your App is of the OAuth App type. Defaults to `false`.

#### Authentication Flow

After the completion of the Github Auth flow, essential data has been prepared for use in the subsequent steps that your app needs to take.

`githubAuth` method provides 4 set key data:

- `token`:
  - Access token to make requests to the Github API for retrieving user information and performing actions on their behalf.
  - Type:
    ```
    {
      token: string
      expires_in: number // -> only available for Oauth Apps
    }
    ```
- `refresh-token`:
  - You can refresh new tokens using this token, which has a longer lifespan. Only available for Oauth Apps.
  - Type:
    ```
    {
      token: string
      expires_in: number
    }
    ```
- `user-github`:
  - User basic info retrieved from Github
  - Type:
    ```
    {
      login:  string
      id:  number
      node_id:  string
      avatar_url:  string
      gravatar_id:  string
      url:  string
      html_url:  string
      followers_url:  string
      following_url:  string
      gists_url:  string
      starred_url:  string
      subscriptions_url:  string
      organizations_url:  string
      repos_url:  string
      events_url:  string
      received_events_url:  string
      type:  string
      site_admin:  boolean
      name:  string
      company:  string
      blog:  string
      location:  string
      email:  string  |  null
      hireable:  boolean  |  null
      bio:  string
      twitter_username:  string
      public_repos:  number
      public_gists:  number
      followers:  number
      following:  number
      created_at:  string
      updated_at:  string
      private_gists:  number, // -> Github App
      total_private_repos:  number, // -> Github App
      owned_private_repos:  number, // -> Github App
      disk_usage:  number, // -> Github App
      collaborators:  number, // -> Github App
      two_factor_authentication:  boolean, // -> Github App
      plan: {
        name:  string,
        space:  number,
        collaborators:  number,
        private_repos:  number
      } // -> Github App
    }
    ```
- `granted-scopes`:
  - If the `include_granted_scopes` parameter was set to `true`, you can find here the scopes for which the user has granted permissions.

#### Github App Example

```ts
import { Hono } from 'hono'
import { githubAuth } from '@hono/oauth-providers/github'

const app = new Hono()

app.use(
  '/github',
  githubAuth({
    client_id: Bun.env.GITHUB_ID,
    client_secret: Bun.env.GITHUB_SECRET,
  })
)

app.get('/github', (c) => {
  const token = c.get('token')
  const user = c.get('user-github')

  return c.json({
    token,
    user,
  })
})

export default app
```

#### OAuth App Example

```ts
import { Hono } from 'hono'
import { githubAuth } from '@hono/oauth-providers/github'

const app = new Hono()

app.use(
  '/github',
  githubAuth({
    client_id: Bun.env.GITHUB_ID,
    client_secret: Bun.env.GITHUB_SECRET,
    scope: ['public_repo', 'read:user', 'user', 'user:email', 'user:follow'],
    oauthApp: true,
  })
)

app.get('/github', (c) => {
  const token = c.get('token')
  const refreshToken = c.get('refresh-token')
  const user = c.get('user-github')

  return c.json({
    token,
    refreshToken,
    user,
  })
})

export default app
```

### LinkedIn

LinkedIn provides two types of Authorization to utilize its API: the `Member Authotization` and the `Application Authorization`. To understand the differences between these authorization methods, you can read this [article](https://learn.microsoft.com/en-us/linkedin/shared/authentication/authentication?context=linkedin%2Fcontext) from LinkedIn, helping you determine the type of Authorization your app should use.

#### Parameters

- `client_id`:
  - Type: `string`.
  - `Required`.
  - `Member` and `Application` authorization.
  - Your app client ID. You can find this value in the [LinkedIn Developer Portal](https://www.linkedin.com/developers/apps). <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `LINKEDIN_ID=`.
- `client_secret`:
  - Type: `string`.
  - `Required`.
  - `Member` and `Application` authorization.
  - Your app client secret. You can find this value in the [LinkedIn Developer Portal](https://www.linkedin.com/developers/apps). <br />When developing **Cloudflare Workers**, there's no need to send this parameter. Just declare it in the `wrangler.toml` file as `LINKEDIN_SECRET=`.
    > Do not share your client secret to ensure the security of your app.
- `scope`:
  - Type: `string[]`.
  - `Required`.
  - `Member Authorization`.
  - Set of **permissions** to request the user's authorization to access your app for retrieving user information and performing actions on their behalf.<br /> Review all the scopes LinkedIn offers for utilizing their API on the [Getting Access docs page](https://learn.microsoft.com/en-us/linkedin/shared/authentication/getting-access).
- `appAuth`: - Type: `boolean`. - `Required`. - `Application Authorization`. - Set this value to `true` if your App uses the App Authorization method. Defaults to `false`.
  > To access the Application Authorization method you have to ask LinkedIn for It. Apparently you have to verify your app then ask for access.

#### Authentication Flow

After the completion of the LinkedIn Auth flow, essential data has been prepared for use in the subsequent steps that your app needs to take.

`linkedinAuth` method provides 4 set key data:

- `token`:
  - Access token to make requests to the LinkedIn API for retrieving user information and performing actions on their behalf.
  - Type:
    ```
    {
      token: string
      expires_in: number
    }
    ```
- `refresh-token`:
  - You can refresh new tokens using this token, which has a longer lifespan. Only available for Member Authorization.
  - Type:
    ```
    {
      token: string
      expires_in: number
    }
    ```
- `user-linkedin`:
  - User basic info retrieved from LinkedIn.
  - Type:
    ```
    {
      sub:  string
      email_verified:  boolean
      name:  string
      locale: {
        country:  string
        language:  string
      },
      given_name:  string
      family_name:  string
      email:  string
      picture:  string
    }
    ```
    > Only available for Member Authorization.
- `granted-scopes`:
  - If the `include_granted_scopes` parameter was set to `true`, you can find here the scopes for which the user has granted permissions.

#### Member Authentication Example

```ts
import { Hono } from 'hono'
import { linkedinAuth } from '@hono/oauth-providers/linkedin'

const app = new Hono()

app.use(
  '/linkedin',
  linkedinAuth({
    client_id: Bun.env.LINKEDIN_ID,
    client_secret: Bun.env.LINKEDIN_SECRET,
    scope: ['email', 'openid', 'profile'],
  })
)

app.get('/linkedin', (c) => {
  const token = c.get('token')
  const user = c.get('user-linkedin')

  return c.json({
    token,
    user,
  })
})

export default app
```

#### Application Example

```ts
import { Hono } from 'hono'
import { linkedinAuth } from '@hono/oauth-providers/linkedin'

const app = new Hono()

app.use(
  '/linkedin',
  linkedinAuth({
    client_id: Bun.env.LINKEDIN_ID,
    client_secret: Bun.env.LINKEDIN_SECRET,
    appAuth: true,
  })
)

app.get('/linkedin', (c) => {
  const token = c.get('token')

  return c.json(token)
})

export default app
```

#### Revoke Token

In certain use cases, you may need to programmatically revoke a user's access token. In such scenarios, you can utilize the `revokeToken` method.

**Parameters**:

- `client_id`:
  - `string`.
- client_secret:
  - `string`.
- `refresh_token`:
  - `string`.

**Return Value**:

- `token`:
  - `string`.

```ts
import { linkedinAuth, refreshToken } from 'open-auth/linkedin'

app.post('linkedin/refresh-token', async (c, next) => {
  const token = await refreshToken(LINKEDIN_ID, LINKEDIN_SECRET, USER_REFRESH_TOKEN)

  // ...
})
```

## Author

monoald https://github.com/monoald

## License

MIT

## Contribute

If you want to add new providers, features or solve some bugs don't doubt to create an issue or make a PR.

For testing purposes run the following code in the parent folder (`middleware/`):