Authorization - Grantex

Overview

The authorization flow starts when your agent needs permissions from a user (principal). You create an authorization request, redirect the user to the consent URL, and receive a callback with an authorization code.

authReq, err := client.Authorize(ctx, grantex.AuthorizeParams{
    AgentID:     "agent-id",
    PrincipalID: "user-123",
    Scopes:      []string{"read:email", "send:email"},
    Audience:    "https://api.example.com",
})

Parameters

Parameter	Type	Required	Description
`AgentID`	`string`	Yes	The agent requesting authorization
`PrincipalID`	`string`	Yes	The user granting authorization
`Scopes`	`[]string`	Yes	Permissions being requested
`Audience`	`string`	No	Intended token recipient, emitted as the grant token’s `aud` claim
`ExpiresIn`	`string`	No	Grant duration (e.g. `"24h"`, `"7d"`)
`RedirectURI`	`string`	No	Where to redirect after consent
`CodeChallenge`	`string`	No	PKCE S256 code challenge
`CodeChallengeMethod`	`string`	No	Must be `"S256"` when using PKCE

Response

Field	Type	Description
`AuthRequestID`	`string`	Unique request identifier
`ConsentURL`	`string`	URL to redirect user for consent
`AgentID`	`string`	Agent ID
`PrincipalID`	`string`	Principal (user) ID
`Scopes`	`[]string`	Requested scopes
`ExpiresIn`	`string`	Requested duration
`ExpiresAt`	`string`	ISO 8601 expiry timestamp
`Status`	`string`	`"pending"`, `"approved"`, `"denied"`, `"expired"`
`CreatedAt`	`string`	ISO 8601 creation timestamp

With PKCE

// Generate PKCE challenge
pkce, err := grantex.GeneratePKCE()
if err != nil {
    log.Fatal(err)
}

// Include challenge in authorization request
authReq, err := client.Authorize(ctx, grantex.AuthorizeParams{
    AgentID:             "agent-id",
    PrincipalID:         "user-123",
    Scopes:              []string{"read:email"},
    CodeChallenge:       pkce.CodeChallenge,
    CodeChallengeMethod: pkce.CodeChallengeMethod,
})

// Later, include verifier when exchanging code
tokenResp, err := client.Tokens.Exchange(ctx, grantex.ExchangeTokenParams{
    Code:         "auth-code",
    AgentID:      "agent-id",
    CodeVerifier: pkce.CodeVerifier,
})

Next Steps

After the user approves the consent, exchange the authorization code for a grant token using tokens.Exchange().

Ownership

Grantex is owned by Orchestrum Technologies LLP. Inventor and owner: Sanjeev Kumar. Ownership contact: sanjeev@orchestrum.in or mishra.sanjeev@gmail.com.

Last modified on August 29, 2026