/
auth.go
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/
auth.go
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// Copyright 2021 The zombiezen Go Client for Discord Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package discord
import (
"context"
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"time"
)
const (
botAuthPrefix = "Bot "
bearerAuthPrefix = "Bearer "
)
// AuthHeader is authentication passed as an Authorization HTTP header value.
// https://discord.com/developers/docs/reference#authentication
type AuthHeader string
// BotAuthorization returns the authentication for a bot token.
func BotAuthorization(token string) AuthHeader {
return AuthHeader(botAuthPrefix + token)
}
// BearerAuthorization returns the authentication for a bearer token.
func BearerAuthorization(token string) AuthHeader {
return AuthHeader(bearerAuthPrefix + token)
}
// IsValid reports whether the authentication is in a format that Discord will
// accept.
func (auth AuthHeader) IsValid() bool {
return strings.HasPrefix(string(auth), botAuthPrefix) ||
strings.HasPrefix(string(auth), bearerAuthPrefix)
}
// token returns the token in the auth header or the empty string if the header
// is invalid.
func (auth AuthHeader) token() string {
switch {
case strings.HasPrefix(string(auth), botAuthPrefix):
return strings.TrimSpace(string(auth[len(botAuthPrefix):]))
case strings.HasPrefix(string(auth), bearerAuthPrefix):
return strings.TrimSpace(string(auth[len(bearerAuthPrefix):]))
default:
return ""
}
}
// AuthorizationInfo holds the response to a CurrentAuthorization call.
// https://discord.com/developers/docs/topics/oauth2#get-current-authorization-information-response-structure
type AuthorizationInfo struct {
Scopes []string `json:"scopes"`
Expires time.Time `json:"expires"`
User *User `json:"user,omitempty"`
}
// CurrentAuthorization returns info about the current authorization.
// https://discord.com/developers/docs/topics/oauth2#get-current-authorization-information
func (c *Client) CurrentAuthorization(ctx context.Context) (*AuthorizationInfo, error) {
resp, err := c.do(ctx, &apiRequest{
method: http.MethodGet,
route: "/oauth2/@me",
})
if err != nil {
return nil, fmt.Errorf("get current authorization info: %v", err)
}
body, err := readBody(resp, maxResponseSize)
resp.Body.Close()
if err != nil {
return nil, fmt.Errorf("get current authorization info: %v", err)
}
parsed := new(AuthorizationInfo)
if err := unmarshalJSON(body, &parsed); err != nil {
return nil, fmt.Errorf("get current authorization info: %v", err)
}
return parsed, nil
}
type OAuth2Options struct {
// BaseURL specifies the client's base URL. If nil, the Discord API URL
// documented in https://discord.com/developers/docs/reference#api-reference-base-url
// is used.
BaseURL *url.URL
// Scopes is the set of scopes to request.
Scopes []string
// State is the unique string described in
// https://discord.com/developers/docs/topics/oauth2#state-and-security
State string
Permissions Permissions
RedirectURI string
}
func OAuth2AuthorizationURL(clientID string, opts *OAuth2Options) *url.URL {
u := defaultBaseURL()
if opts != nil && opts.BaseURL != nil {
*u = *opts.BaseURL
}
u.Path = strings.TrimRight(u.Path, "/") + "/oauth2/authorize"
q := u.Query()
q.Set("client_id", clientID)
if opts != nil {
if len(opts.Scopes) > 0 {
q.Set("scope", strings.Join(opts.Scopes, " "))
}
if opts.State != "" {
q.Set("state", opts.State)
}
if opts.RedirectURI != "" {
q.Set("redirect_uri", opts.RedirectURI)
}
if opts.Permissions != 0 {
q.Set("permissions", strconv.FormatUint(uint64(opts.Permissions), 10))
}
}
u.RawQuery = q.Encode()
return u
}