gotosocial/vendor/github.com/superseriousbusiness/oauth2/v4/const.go

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package oauth2
import (
"crypto/sha256"
"encoding/base64"
"strings"
)
// ResponseType the type of authorization request
type ResponseType string
// define the type of authorization request
const (
Code ResponseType = "code"
Token ResponseType = "token"
)
func (rt ResponseType) String() string {
return string(rt)
}
// GrantType authorization model
type GrantType string
// define authorization model
const (
AuthorizationCode GrantType = "authorization_code"
PasswordCredentials GrantType = "password"
ClientCredentials GrantType = "client_credentials"
Refreshing GrantType = "refresh_token"
Implicit GrantType = "__implicit"
)
func (gt GrantType) String() string {
if gt == AuthorizationCode ||
gt == PasswordCredentials ||
gt == ClientCredentials ||
gt == Refreshing {
return string(gt)
}
return ""
}
// CodeChallengeMethod PCKE method
type CodeChallengeMethod string
const (
// CodeChallengePlain PCKE Method
CodeChallengePlain CodeChallengeMethod = "plain"
// CodeChallengeS256 PCKE Method
CodeChallengeS256 CodeChallengeMethod = "S256"
)
func (ccm CodeChallengeMethod) String() string {
if ccm == CodeChallengePlain ||
ccm == CodeChallengeS256 {
return string(ccm)
}
return ""
}
// Validate code challenge
func (ccm CodeChallengeMethod) Validate(cc, ver string) bool {
switch ccm {
case CodeChallengePlain:
return cc == ver
case CodeChallengeS256:
s256 := sha256.Sum256([]byte(ver))
// trim padding
a := strings.TrimRight(base64.URLEncoding.EncodeToString(s256[:]), "=")
b := strings.TrimRight(cc, "=")
return a == b
default:
return false
}
}