Access Manager v3 API for Go SDK

Access Manager lets you enforce security controls for client access to resources on the PubNub platform. With Access Manager v3, your servers (that use a PubNub instance configured with a secret key) can grant clients tokens with embedded permissions that provide access to individual PubNub resources:

• For a limited time period.
• Through resource lists or regular expression (RegEx) patterns.
• In one API request, even when permissions differ (for example, read to channel1 and write to channel2).

You can add the authorizedUuid parameter to the grant request to restrict the token usage to one client with a given userId. Once specified, only this authorizedUuid will be able to use the token to make API requests for the specified resources, according to permissions given in the grant request.

User ID / UUID

User ID is also referred to as UUID/uuid in some APIs and server responses but holds the value of the userId parameter you set during initialization.

For more information about Access Manager v3, refer to Manage Permissions with Access Manager v3.

Grant token

Requires Access Manager add-on

This method requires that the Access Manager add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Requires Secret Key authentication

Granting permissions to resources should be done by administrators whose SDK instance has been initialized with a Secret Key (available on the Admin Portal on your app's keyset).

The GrantToken() method generates a time-limited authorization token with an embedded access control list. The token defines time to live (TTL), AuthorizedUUID, and a set of permissions giving access to one or more resources:

• Channels
• ChannelGroups
• UUIDs (other users' object metadata, such as their names or avatars)

Only this AuthorizedUUID will be able to use the token with the defined permissions. The authorized client will send the token to PubNub with each request until the token's TTL expires. Any unauthorized request or a request made with an invalid token will return a 403 with a respective error message.

Permissions

The grant request allows your server to securely grant clients access to resources on the PubNub platform. Each resource type supports a specific set of operations:

Resource	Permissions
Channels	read, write, get, manage, update, join, delete
ChannelGroups	read, manage
UUIDs	get, update, delete

For permissions and API operations mapping, refer to Manage Permissions with Access Manager v3.

TTL (time to live)

The ttl (time to live) parameter defines how many minutes the permissions remain valid. After expiration, the client must get a new token to maintain access. ttl is required for every grant call. There is no default value. The maximum value is 43,200 (30 days).

For more details, see TTL in Access Manager v3.

RegEx patterns

Use regular expressions (RegEx) to specify permissions by pattern instead of listing each resource. Define RegEx permissions for a given resource type in the grant request.

For more details, see RegEx in Access Manager v3.

Authorized UUID

Setting an AuthorizedUUID in the token specifies which client should use this token in every request to PubNub. If you do not set AuthorizedUUID during the grant request, the token can be used by any client with any UUID. Restrict tokens to a single AuthorizedUUID to prevent impersonation.

For more details, see Authorized UUID in Access Manager v3.

Method(s)

pn.GrantToken().
  UUIDs(map[string]UUIDPermissions).
  Channels(map[string]ChannelPermissions).
  ChannelGroups(map[string]GroupPermissions).
  UUIDsPattern(map[string]UUIDPermissions).
  ChannelsPattern(map[string]ChannelPermissions).
  ChannelGroupsPattern(map[string]GroupPermissions).
  TTL(int).
  AuthorizedUUID(string).
  Meta(map[string]interface{}).
  QueryParam(queryParam).
  Execute()

* required

Parameter	Description
UUIDs Type: map[string]UUIDPermissions Default: n/a	Map of uuids to permissions.
Channels Type: map[string]ChannelPermissions Default: n/a	Map of channel names to permissions.
ChannelGroups Type: map[string]GroupPermissions Default: n/a	Map of channel group ids to permissions.
UUIDsPattern Type: map[string]UUIDPermissions Default: n/a	Map of uuid patterns to permissions.
ChannelsPattern Type: map[string]ChannelPermissions Default: n/a	Map of channel patterns to permissions.
ChannelGroupsPattern Type: map[string]GroupPermissions Default: n/a	Map of channel group patterns to permissions.
TTL * Type: Number Default: n/a	Total number of minutes for which the token is valid. The minimum allowed value is 1. The maximum is 43,200 minutes (30 days).
AuthorizedUUID Type: String Default: n/a	Single UUID which is authorized to use the token to make API requests to PubNub.
Meta Type: Object Default: n/a	Extra metadata to be published with the request. Values must be scalar only; arrays or objects are not supported.

Required key/value mappings

For a successful grant request, you must specify permissions for at least one UUID, Channel, or ChannelGroup, either as a resource list or as a pattern (RegEx).

Sample code

Reference code

This example is a self-contained code snippet ready to be run. It includes necessary imports and executes methods with console logging. Use it as a reference when working with other examples in this document.

package main

import (
	"fmt"
	"log"

	pubnub "github.com/pubnub/go/v7"
)

func main() {
	// Configuration for PubNub with demo keys
	config := pubnub.NewConfigWithUserId("myUniqueUserId")
	config.SubscribeKey = "demo"
	config.PublishKey = "demo"
	config.SecretKey = "mySecretKey" // Required for grantToken

show all 48 lines

Returns

PNGrantTokenResponse{
  Data: PNGrantTokenData{
      Message: "Success",
      Token: "p0thisAkFl043rhDdHRsCkNyZXisRGNoYW6hanNlY3JldAFDZ3Jwsample3KgQ3NwY6BDcGF0pERjaGFuoENnctokenVzcqBDc3BjoERtZXRhoENzaWdYIGOAeTyWGJI",
  }
}

Other examples

Grant an authorized client different levels of access to various resources in a single call

The code below grants my-authorized-uuid:

• Read access to channel-a, channel-group-b, and get to uuid-c.
• Read/write access to channel-b, channel-c, channel-d, and get/update to uuid-d.

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUUID("my-authorized-uuid").
        Channels(map[string]pubnub.ChannelPermissions{
                "channel-a": {
                        Read: true,
                },
                "channel-b": {
                        Read: true,
                        Write: true,
                },
                "channel-c": {
                        Read: true,
                        Write: true,
                },

show all 35 lines

Grant an authorized client read access to multiple channels using RegEx

The code below grants my-authorized-uuid read access to all channels that match the channel-[A-Za-z0-9] RegEx pattern.

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUUID("my-authorized-uuid").
        ChannelsPattern(map[string]pubnub.ChannelPermissions{
                "^channel-[A-Za-z0-9]*$": {
                        Read: true,
                },
        }).
        Execute()

Grant an authorized client different levels of access to various resources and read access to channels using RegEx in a single call

The code below grants the my-authorized-uuid:

• Read access to channel-a, channel-group-b, and get to uuid-c.
• Read/write access to channel-b, channel-c, channel-d, and get/update to uuid-d.
• Read access to all channels that match the channel-[A-Za-z0-9] RegEx pattern.

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUUID("my-authorized-uuid").
        Channels(map[string]pubnub.ChannelPermissions{
                "channel-a": {
                        Read: true,
                },
                "channel-b": {
                        Read: true,
                        Write: true,
                },
                "channel-c": {
                        Read: true,
                        Write: true,
                },

show all 40 lines

Error responses

If you submit an invalid request, the server returns HTTP 400 with a message that identifies the missing or incorrect argument. Causes can include a RegEx issue, an invalid timestamp, or incorrect permissions.

Grant token - spaces & users

Requires Access Manager add-on

This method requires that the Access Manager add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

The grantToken() method generates a time-limited authorization token with an embedded access control list. The token defines time to live (ttl), authorizedUserId, and a set of permissions giving access to one or more resources:

• spaces
• users (other users' metadata, such as their names or avatars)

Only this authorizedUserId will be able to use the token with the defined permissions. The authorized client will send the token to PubNub with each request until the token's ttl expires. Any unauthorized request or a request made with an invalid token will return a 403 with a respective error message.

Permissions

The grant request allows your server to securely grant your clients access to the resources within the PubNub Platform. There is a limited set of operations the clients can perform on every resource:

Resource	Permissions
space	read, write, get, manage, update, join, delete
user	get, update, delete

For permissions and API operations mapping, refer to Manage Permissions with Access Manager v3.

TTL (time to live)

The ttl (time to live) parameter defines how many minutes the permissions remain valid. After expiration, the client must get a new token to maintain access. ttl is required for every grant call. There is no default value. The maximum value is 43,200 (30 days).

For more details, see TTL in Access Manager v3.

RegEx patterns

If you prefer to specify permissions by setting patterns, rather than listing all resources one by one, you can use regular expressions. To do this, set RegEx permissions as patterns before making a grant request.

For more details, see RegEx in Access Manager v3.

Authorized user ID

Setting an authorizedUserId in the token helps you specify which client device should use this token in every request to PubNub. This will ensure that all requests to PubNub are authorized before PubNub processes them. If authorizedUserId isn't specified during the grant request, the token can be used by any client with any userId. It's recommended to restrict tokens to a single authorizedUserId to prevent impersonation.

For more details, see Authorized UUID in Access Manager v3.

Method(s)

pn.GrantToken().
  UsersPermissions(map[UserId]UserPermissions).
  SpacesPermissions(map[SpaceId]SpacePermissions).
  UserPatternsPermissions(map[string]UserPermissions).
  SpacePatternsPermissions(map[string]SpacePermissions).
  TTL(int).
  AuthorizedUserId(UserId).
  Meta(map[string]interface{}).
  QueryParam(queryParam).
  Execute()

* required

Parameter	Description
UsersPermissions Type: map[UserId]UserPermissions Default: n/a	Map of Users to permissions.
SpacesPermissions Type: map[SpaceId]SpacePermissions Default: n/a	Map of Spaces to permissions.
UserPatternsPermissions Type: map[string]UserPermissions) Default: n/a	Map of User patterns to permissions.
SpacePatternsPermissions Type: map[string]SpacePermissions Default: n/a	Map of Space patterns to permissions.
TTL * Type: Number Default: n/a	Total number of minutes for which the token is valid. The minimum allowed value is 1. The maximum is 43,200 minutes (30 days).
AuthorizedUserId Type: UserId Default: n/a	Single UserId which is authorized to use the token to make API requests to PubNub.
Meta Type: Object Default: n/a	Extra metadata to be published with the request. Values must be scalar only; arrays or objects are not supported.

Required key/value mappings

For a successful grant request, you must specify permissions for at least one User or Space either as a resource list or as a pattern (RegEx).

Sample code

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUserId("my-authorized-userId").
        SpacesPermissions(map[SpaceId]pubnub.SpacePermissions{
                "my_spaces": {
                        Read: true,
                },
        }).
        Execute()

Returns

PNGrantTokenResponse{
  Data: PNGrantTokenData{
      Message: "Success",
      Token: "p0thisAkFl043rhDdHRsCkNyZXisRGNoYW6hanNlY3JldAFDZ3Jwsample3KgQ3NwY6BDcGF0pERjaGFuoENnctokenVzcqBDc3BjoERtZXRhoENzaWdYIGOAeTyWGJI",
  }
}

Other examples

Grant an authorized client different levels of access to various resources in a single call

The code below grants my-authorized-userId:

• Read access to space-a, and get to userId-c.
• Read/write access to space-b, space-c, space-d, and get/update to userId-d.

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUserId("my-authorized-userId").
        SpacesPermissions(map[SpaceId]pubnub.SpacePermissions{
                "space-a": {
                        Read: true,
                },
                "space-b": {
                        Read: true,
                        Write: true,
                },
                "space-c": {
                        Read: true,
                        Write: true,
                },

show all 30 lines

Grant an authorized client read access to multiple spaces using RegEx

The code below grants my-authorized-userId read access to all channels that match the space-[A-Za-z0-9] RegEx pattern.

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUserId("my-authorized-userId").
        SpacePatternsPermissions(map[string]pubnub.SpacePermissions{
                "^space-[A-Za-z0-9]*$": {
                        Read: true,
                },
        }).
        Execute()

Grant an authorized client different levels of access to various resources and read access to spaces using RegEx in a single call

The code below grants the my-authorized-userId:

• Read access to space-a and userId-c.
• Read/write access to space-b, space-c, space-d, and get/update to userId-d.
• Read access to all channels that match the space-[A-Za-z0-9] RegEx pattern.

res, status, err := pn.GrantToken().
        TTL(15).
        AuthorizedUserId("my-authorized-userId").
        SpacesPermissions(map[string]pubnub.SpacePermissions{
                "space-a": {
                        Read: true,
                },
                "space-b": {
                        Read: true,
                        Write: true,
                },
                "space-c": {
                        Read: true,
                        Write: true,
                },

show all 35 lines

Error responses

If you submit an invalid request, the server returns HTTP 400 with a message that identifies the missing or incorrect argument. Causes can include a RegEx issue, an invalid timestamp, or incorrect permissions.

Revoke token

Requires Access Manager add-on

This method requires that the Access Manager add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Enable token revoke

To revoke tokens, you must first enable this feature on the Admin Portal. To do that, navigate to your app's keyset and mark the Revoke v3 Token checkbox in the ACCESS MANAGER section.

The RevokeToken() method allows you to disable an existing token and revoke all permissions embedded within. You can only revoke a valid token previously obtained using the GrantToken() method.

Use this method for tokens with ttl less than or equal to 30 days. If you need to revoke a token with a longer ttl, contact support.

For more information, refer to Revoke permissions.

Method(s)

pn.RevokeToken().
        Token(string)

* required

Parameter	Description
Token * Type: string Default: n/a	Existing token with embedded permissions.

Sample code

res, status, err := pn.RevokeToken().
        Token("p0thisAkFl043rhDdHRsCkNyZXisRGNoYW6hanNlY3JldAFDZ3Jwsample3KgQ3NwY6BDcGF0pERjaGFuoENnctokenV").
        Execute()

Returns

The RevokeToken() operation returns an empty PNRevokeTokenResponse interface.

Error Responses

If you submit an invalid request, the server returns an error status code with a descriptive message informing which of the provided arguments is missing or incorrect. Depending on the root cause, this operation may return the following errors:

• 400 Bad Request
• 403 Forbidden
• 503 Service Unavailable

Parse token

The ParseToken() method decodes an existing token and returns the object containing permissions embedded in that token. The client can use this method for debugging to check the permissions to the resources or find out the token's TTL details.

Import the pubnub package before you use the ParseToken() method:

import (
        pubnub "github.com/pubnub/go/v5")

Method(s)

pubnub.ParseToken(token string)

* required

Parameter	Description
token * Type: String Default: n/a	Current token with embedded permissions.

Sample code

pubnub.ParseToken("p0thisAkFl043rhDdHRsCkNyZXisRGNoYW6hanNlY3JldAFDZ3Jwsample3KgQ3NwY6BDcGF0pERjaGFuoENnctokenVzcqBDc3BjoERtZXRhoENzaWdYIGOAeTyWGJI")

Returns

PNToken{
  Version: 2,
  Timestamp: 1619718521,
  TTL: 15,
  AuthorizedUUID: "user1",
  Resources: PNTokenResources{
    Channels: make[string]ChannelPermissions{
      Read: true,
      Write: true,
      Delete: true,
      Get: true,
      Manage: true,
      Update: true,
      Join: true,
    },

show all 46 lines

Error Responses

If you receive an error while parsing the token, it may suggest that the token is damaged. In that case, request the server to issue a new one.

Set token

The SetToken() method is used by the client devices to update the authentication token granted by the server.

Method(s)

pn.SetToken(token string)

* required

Parameter	Description
token * Type: String Default: n/a	Current token with embedded permissions.

Sample code

pn.SetToken("p0thisAkFl043rhDdHRsCkNyZXisRGNoYW6hanNlY3JldAFDZ3Jwsample3KgQ3NwY6BDcGF0pERjaGFuoENnctokenVzcqBDc3BjoERtZXRhoENzaWdYIGOAeTyWGJI")

Returns

This method doesn't return any response value.