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	Improve error descriptions for unauthorized_client (#21292)
Fixes #21282 As suggested by the [OAuth RFC](https://www.rfc-editor.org/rfc/rfc6749) (quoted below), it's helpful to give more detail in the description > error_description OPTIONAL. Human-readable ASCII [[USASCII](https://www.rfc-editor.org/rfc/rfc6749#ref-USASCII)] text providing **additional information, used to assist the client developer in understanding the error that occurred.** Values for the "error_description" parameter MUST NOT include characters outside the set %x20-21 / %x23-5B / %x5D-7E.
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		@@ -645,7 +645,7 @@ func handleRefreshToken(ctx *context.Context, form forms.AccessTokenForm, server
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	if err != nil {
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		handleAccessTokenError(ctx, AccessTokenError{
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			ErrorCode:        AccessTokenErrorCodeUnauthorizedClient,
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			ErrorDescription: "client is not authorized",
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			ErrorDescription: "unable to parse refresh token",
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		})
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		return
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	}
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@@ -688,14 +688,14 @@ func handleAuthorizationCode(ctx *context.Context, form forms.AccessTokenForm, s
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	if !app.ValidateClientSecret([]byte(form.ClientSecret)) {
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		handleAccessTokenError(ctx, AccessTokenError{
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			ErrorCode:        AccessTokenErrorCodeUnauthorizedClient,
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			ErrorDescription: "client is not authorized",
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			ErrorDescription: "invalid client secret",
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		})
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		return
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	}
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	if form.RedirectURI != "" && !app.ContainsRedirectURI(form.RedirectURI) {
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		handleAccessTokenError(ctx, AccessTokenError{
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			ErrorCode:        AccessTokenErrorCodeUnauthorizedClient,
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			ErrorDescription: "client is not authorized",
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			ErrorDescription: "unexpected redirect URI",
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		})
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		return
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	}
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@@ -711,7 +711,7 @@ func handleAuthorizationCode(ctx *context.Context, form forms.AccessTokenForm, s
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	if !authorizationCode.ValidateCodeChallenge(form.CodeVerifier) {
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		handleAccessTokenError(ctx, AccessTokenError{
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			ErrorCode:        AccessTokenErrorCodeUnauthorizedClient,
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			ErrorDescription: "client is not authorized",
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			ErrorDescription: "failed PKCE code challenge",
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		})
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		return
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	}
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