mirror of
https://github.com/go-gitea/gitea.git
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16dea6cebd
* replace "200" (int) with "http.StatusOK" (const) * ctx.Error & ctx.HTML * ctx.JSON Part1 * ctx.JSON Part2 * ctx.JSON Part3
564 lines
18 KiB
Go
564 lines
18 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package user
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import (
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"encoding/base64"
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"fmt"
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"html"
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"net/http"
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"net/url"
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"strings"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/base"
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"code.gitea.io/gitea/modules/context"
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auth "code.gitea.io/gitea/modules/forms"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/timeutil"
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"code.gitea.io/gitea/modules/web"
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"gitea.com/go-chi/binding"
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"github.com/dgrijalva/jwt-go"
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)
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const (
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tplGrantAccess base.TplName = "user/auth/grant"
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tplGrantError base.TplName = "user/auth/grant_error"
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)
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// TODO move error and responses to SDK or models
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// AuthorizeErrorCode represents an error code specified in RFC 6749
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type AuthorizeErrorCode string
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const (
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// ErrorCodeInvalidRequest represents the according error in RFC 6749
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ErrorCodeInvalidRequest AuthorizeErrorCode = "invalid_request"
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// ErrorCodeUnauthorizedClient represents the according error in RFC 6749
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ErrorCodeUnauthorizedClient AuthorizeErrorCode = "unauthorized_client"
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// ErrorCodeAccessDenied represents the according error in RFC 6749
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ErrorCodeAccessDenied AuthorizeErrorCode = "access_denied"
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// ErrorCodeUnsupportedResponseType represents the according error in RFC 6749
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ErrorCodeUnsupportedResponseType AuthorizeErrorCode = "unsupported_response_type"
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// ErrorCodeInvalidScope represents the according error in RFC 6749
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ErrorCodeInvalidScope AuthorizeErrorCode = "invalid_scope"
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// ErrorCodeServerError represents the according error in RFC 6749
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ErrorCodeServerError AuthorizeErrorCode = "server_error"
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// ErrorCodeTemporaryUnavailable represents the according error in RFC 6749
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ErrorCodeTemporaryUnavailable AuthorizeErrorCode = "temporarily_unavailable"
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)
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// AuthorizeError represents an error type specified in RFC 6749
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type AuthorizeError struct {
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ErrorCode AuthorizeErrorCode `json:"error" form:"error"`
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ErrorDescription string
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State string
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}
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// Error returns the error message
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func (err AuthorizeError) Error() string {
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return fmt.Sprintf("%s: %s", err.ErrorCode, err.ErrorDescription)
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}
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// AccessTokenErrorCode represents an error code specified in RFC 6749
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type AccessTokenErrorCode string
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const (
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// AccessTokenErrorCodeInvalidRequest represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidRequest AccessTokenErrorCode = "invalid_request"
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// AccessTokenErrorCodeInvalidClient represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidClient = "invalid_client"
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// AccessTokenErrorCodeInvalidGrant represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidGrant = "invalid_grant"
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// AccessTokenErrorCodeUnauthorizedClient represents an error code specified in RFC 6749
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AccessTokenErrorCodeUnauthorizedClient = "unauthorized_client"
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// AccessTokenErrorCodeUnsupportedGrantType represents an error code specified in RFC 6749
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AccessTokenErrorCodeUnsupportedGrantType = "unsupported_grant_type"
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// AccessTokenErrorCodeInvalidScope represents an error code specified in RFC 6749
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AccessTokenErrorCodeInvalidScope = "invalid_scope"
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)
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// AccessTokenError represents an error response specified in RFC 6749
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type AccessTokenError struct {
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ErrorCode AccessTokenErrorCode `json:"error" form:"error"`
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ErrorDescription string `json:"error_description"`
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}
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// Error returns the error message
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func (err AccessTokenError) Error() string {
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return fmt.Sprintf("%s: %s", err.ErrorCode, err.ErrorDescription)
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}
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// TokenType specifies the kind of token
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type TokenType string
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const (
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// TokenTypeBearer represents a token type specified in RFC 6749
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TokenTypeBearer TokenType = "bearer"
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// TokenTypeMAC represents a token type specified in RFC 6749
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TokenTypeMAC = "mac"
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)
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// AccessTokenResponse represents a successful access token response
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type AccessTokenResponse struct {
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AccessToken string `json:"access_token"`
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TokenType TokenType `json:"token_type"`
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ExpiresIn int64 `json:"expires_in"`
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RefreshToken string `json:"refresh_token"`
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IDToken string `json:"id_token,omitempty"`
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}
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func newAccessTokenResponse(grant *models.OAuth2Grant, clientSecret string) (*AccessTokenResponse, *AccessTokenError) {
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if setting.OAuth2.InvalidateRefreshTokens {
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if err := grant.IncreaseCounter(); err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidGrant,
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ErrorDescription: "cannot increase the grant counter",
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}
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}
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}
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// generate access token to access the API
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expirationDate := timeutil.TimeStampNow().Add(setting.OAuth2.AccessTokenExpirationTime)
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accessToken := &models.OAuth2Token{
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GrantID: grant.ID,
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Type: models.TypeAccessToken,
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: expirationDate.AsTime().Unix(),
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},
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}
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signedAccessToken, err := accessToken.SignToken()
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot sign token",
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}
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}
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// generate refresh token to request an access token after it expired later
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refreshExpirationDate := timeutil.TimeStampNow().Add(setting.OAuth2.RefreshTokenExpirationTime * 60 * 60).AsTime().Unix()
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refreshToken := &models.OAuth2Token{
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GrantID: grant.ID,
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Counter: grant.Counter,
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Type: models.TypeRefreshToken,
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: refreshExpirationDate,
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},
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}
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signedRefreshToken, err := refreshToken.SignToken()
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot sign token",
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}
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}
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// generate OpenID Connect id_token
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signedIDToken := ""
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if grant.ScopeContains("openid") {
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app, err := models.GetOAuth2ApplicationByID(grant.ApplicationID)
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot find application",
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}
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}
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idToken := &models.OIDCToken{
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StandardClaims: jwt.StandardClaims{
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ExpiresAt: expirationDate.AsTime().Unix(),
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Issuer: setting.AppURL,
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Audience: app.ClientID,
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Subject: fmt.Sprint(grant.UserID),
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},
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Nonce: grant.Nonce,
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}
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signedIDToken, err = idToken.SignToken(clientSecret)
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if err != nil {
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return nil, &AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot sign token",
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}
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}
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}
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return &AccessTokenResponse{
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AccessToken: signedAccessToken,
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TokenType: TokenTypeBearer,
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ExpiresIn: setting.OAuth2.AccessTokenExpirationTime,
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RefreshToken: signedRefreshToken,
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IDToken: signedIDToken,
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}, nil
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}
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// AuthorizeOAuth manages authorize requests
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func AuthorizeOAuth(ctx *context.Context) {
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form := web.GetForm(ctx).(*auth.AuthorizationForm)
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errs := binding.Errors{}
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errs = form.Validate(ctx.Req, errs)
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if len(errs) > 0 {
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errstring := ""
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for _, e := range errs {
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errstring += e.Error() + "\n"
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}
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ctx.ServerError("AuthorizeOAuth: Validate: ", fmt.Errorf("errors occurred during validation: %s", errstring))
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return
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}
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app, err := models.GetOAuth2ApplicationByClientID(form.ClientID)
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if err != nil {
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if models.IsErrOauthClientIDInvalid(err) {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeUnauthorizedClient,
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ErrorDescription: "Client ID not registered",
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State: form.State,
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}, "")
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return
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}
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ctx.ServerError("GetOAuth2ApplicationByClientID", err)
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return
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}
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if err := app.LoadUser(); err != nil {
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ctx.ServerError("LoadUser", err)
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return
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}
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if !app.ContainsRedirectURI(form.RedirectURI) {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeInvalidRequest,
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ErrorDescription: "Unregistered Redirect URI",
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State: form.State,
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}, "")
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return
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}
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if form.ResponseType != "code" {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeUnsupportedResponseType,
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ErrorDescription: "Only code response type is supported.",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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// pkce support
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switch form.CodeChallengeMethod {
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case "S256":
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case "plain":
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if err := ctx.Session.Set("CodeChallengeMethod", form.CodeChallengeMethod); err != nil {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeServerError,
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ErrorDescription: "cannot set code challenge method",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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if err := ctx.Session.Set("CodeChallengeMethod", form.CodeChallenge); err != nil {
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeServerError,
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ErrorDescription: "cannot set code challenge",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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// Here we're just going to try to release the session early
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if err := ctx.Session.Release(); err != nil {
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// we'll tolerate errors here as they *should* get saved elsewhere
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log.Error("Unable to save changes to the session: %v", err)
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}
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case "":
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break
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default:
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handleAuthorizeError(ctx, AuthorizeError{
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ErrorCode: ErrorCodeInvalidRequest,
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ErrorDescription: "unsupported code challenge method",
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State: form.State,
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}, form.RedirectURI)
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return
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}
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grant, err := app.GetGrantByUserID(ctx.User.ID)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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// Redirect if user already granted access
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if grant != nil {
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code, err := grant.GenerateNewAuthorizationCode(form.RedirectURI, form.CodeChallenge, form.CodeChallengeMethod)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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redirect, err := code.GenerateRedirectURI(form.State)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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// Update nonce to reflect the new session
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if len(form.Nonce) > 0 {
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err := grant.SetNonce(form.Nonce)
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if err != nil {
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log.Error("Unable to update nonce: %v", err)
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}
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}
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ctx.Redirect(redirect.String(), 302)
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return
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}
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// show authorize page to grant access
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ctx.Data["Application"] = app
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ctx.Data["RedirectURI"] = form.RedirectURI
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ctx.Data["State"] = form.State
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ctx.Data["Scope"] = form.Scope
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ctx.Data["Nonce"] = form.Nonce
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ctx.Data["ApplicationUserLink"] = "<a href=\"" + html.EscapeString(setting.AppURL) + html.EscapeString(url.PathEscape(app.User.LowerName)) + "\">@" + html.EscapeString(app.User.Name) + "</a>"
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ctx.Data["ApplicationRedirectDomainHTML"] = "<strong>" + html.EscapeString(form.RedirectURI) + "</strong>"
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// TODO document SESSION <=> FORM
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err = ctx.Session.Set("client_id", app.ClientID)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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log.Error(err.Error())
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return
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}
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err = ctx.Session.Set("redirect_uri", form.RedirectURI)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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log.Error(err.Error())
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return
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}
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err = ctx.Session.Set("state", form.State)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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log.Error(err.Error())
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return
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}
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// Here we're just going to try to release the session early
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if err := ctx.Session.Release(); err != nil {
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// we'll tolerate errors here as they *should* get saved elsewhere
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log.Error("Unable to save changes to the session: %v", err)
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}
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ctx.HTML(http.StatusOK, tplGrantAccess)
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}
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// GrantApplicationOAuth manages the post request submitted when a user grants access to an application
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func GrantApplicationOAuth(ctx *context.Context) {
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form := web.GetForm(ctx).(*auth.GrantApplicationForm)
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if ctx.Session.Get("client_id") != form.ClientID || ctx.Session.Get("state") != form.State ||
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ctx.Session.Get("redirect_uri") != form.RedirectURI {
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ctx.Error(http.StatusBadRequest)
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return
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}
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app, err := models.GetOAuth2ApplicationByClientID(form.ClientID)
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if err != nil {
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ctx.ServerError("GetOAuth2ApplicationByClientID", err)
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return
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}
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grant, err := app.CreateGrant(ctx.User.ID, form.Scope)
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if err != nil {
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handleAuthorizeError(ctx, AuthorizeError{
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State: form.State,
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ErrorDescription: "cannot create grant for user",
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ErrorCode: ErrorCodeServerError,
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}, form.RedirectURI)
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return
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}
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if len(form.Nonce) > 0 {
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err := grant.SetNonce(form.Nonce)
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if err != nil {
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log.Error("Unable to update nonce: %v", err)
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}
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}
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var codeChallenge, codeChallengeMethod string
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codeChallenge, _ = ctx.Session.Get("CodeChallenge").(string)
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codeChallengeMethod, _ = ctx.Session.Get("CodeChallengeMethod").(string)
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code, err := grant.GenerateNewAuthorizationCode(form.RedirectURI, codeChallenge, codeChallengeMethod)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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redirect, err := code.GenerateRedirectURI(form.State)
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if err != nil {
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handleServerError(ctx, form.State, form.RedirectURI)
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return
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}
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ctx.Redirect(redirect.String(), 302)
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}
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// AccessTokenOAuth manages all access token requests by the client
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func AccessTokenOAuth(ctx *context.Context) {
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form := *web.GetForm(ctx).(*auth.AccessTokenForm)
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if form.ClientID == "" {
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authHeader := ctx.Req.Header.Get("Authorization")
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authContent := strings.SplitN(authHeader, " ", 2)
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if len(authContent) == 2 && authContent[0] == "Basic" {
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payload, err := base64.StdEncoding.DecodeString(authContent[1])
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if err != nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot parse basic auth header",
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})
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return
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}
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pair := strings.SplitN(string(payload), ":", 2)
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if len(pair) != 2 {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidRequest,
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ErrorDescription: "cannot parse basic auth header",
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})
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return
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}
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form.ClientID = pair[0]
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form.ClientSecret = pair[1]
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}
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}
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switch form.GrantType {
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case "refresh_token":
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handleRefreshToken(ctx, form)
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return
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case "authorization_code":
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handleAuthorizationCode(ctx, form)
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return
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default:
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnsupportedGrantType,
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ErrorDescription: "Only refresh_token or authorization_code grant type is supported",
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})
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}
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}
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func handleRefreshToken(ctx *context.Context, form auth.AccessTokenForm) {
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token, err := models.ParseOAuth2Token(form.RefreshToken)
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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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})
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return
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}
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// get grant before increasing counter
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grant, err := models.GetOAuth2GrantByID(token.GrantID)
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if err != nil || grant == nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidGrant,
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ErrorDescription: "grant does not exist",
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})
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return
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}
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// check if token got already used
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if setting.OAuth2.InvalidateRefreshTokens && (grant.Counter != token.Counter || token.Counter == 0) {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
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ErrorDescription: "token was already used",
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})
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log.Warn("A client tried to use a refresh token for grant_id = %d was used twice!", grant.ID)
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return
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}
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accessToken, tokenErr := newAccessTokenResponse(grant, form.ClientSecret)
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if tokenErr != nil {
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handleAccessTokenError(ctx, *tokenErr)
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return
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}
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ctx.JSON(http.StatusOK, accessToken)
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}
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func handleAuthorizationCode(ctx *context.Context, form auth.AccessTokenForm) {
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app, err := models.GetOAuth2ApplicationByClientID(form.ClientID)
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if err != nil {
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handleAccessTokenError(ctx, AccessTokenError{
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ErrorCode: AccessTokenErrorCodeInvalidClient,
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ErrorDescription: fmt.Sprintf("cannot load client with client id: '%s'", form.ClientID),
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})
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return
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}
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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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})
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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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})
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return
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}
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authorizationCode, err := models.GetOAuth2AuthorizationByCode(form.Code)
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if err != nil || authorizationCode == 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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})
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return
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}
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// check if code verifier authorizes the client, PKCE support
|
|
if !authorizationCode.ValidateCodeChallenge(form.CodeVerifier) {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeUnauthorizedClient,
|
|
ErrorDescription: "client is not authorized",
|
|
})
|
|
return
|
|
}
|
|
// check if granted for this application
|
|
if authorizationCode.Grant.ApplicationID != app.ID {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeInvalidGrant,
|
|
ErrorDescription: "invalid grant",
|
|
})
|
|
return
|
|
}
|
|
// remove token from database to deny duplicate usage
|
|
if err := authorizationCode.Invalidate(); err != nil {
|
|
handleAccessTokenError(ctx, AccessTokenError{
|
|
ErrorCode: AccessTokenErrorCodeInvalidRequest,
|
|
ErrorDescription: "cannot proceed your request",
|
|
})
|
|
}
|
|
resp, tokenErr := newAccessTokenResponse(authorizationCode.Grant, form.ClientSecret)
|
|
if tokenErr != nil {
|
|
handleAccessTokenError(ctx, *tokenErr)
|
|
return
|
|
}
|
|
// send successful response
|
|
ctx.JSON(http.StatusOK, resp)
|
|
}
|
|
|
|
func handleAccessTokenError(ctx *context.Context, acErr AccessTokenError) {
|
|
ctx.JSON(http.StatusBadRequest, acErr)
|
|
}
|
|
|
|
func handleServerError(ctx *context.Context, state string, redirectURI string) {
|
|
handleAuthorizeError(ctx, AuthorizeError{
|
|
ErrorCode: ErrorCodeServerError,
|
|
ErrorDescription: "A server error occurred",
|
|
State: state,
|
|
}, redirectURI)
|
|
}
|
|
|
|
func handleAuthorizeError(ctx *context.Context, authErr AuthorizeError, redirectURI string) {
|
|
if redirectURI == "" {
|
|
log.Warn("Authorization failed: %v", authErr.ErrorDescription)
|
|
ctx.Data["Error"] = authErr
|
|
ctx.HTML(400, tplGrantError)
|
|
return
|
|
}
|
|
redirect, err := url.Parse(redirectURI)
|
|
if err != nil {
|
|
ctx.ServerError("url.Parse", err)
|
|
return
|
|
}
|
|
q := redirect.Query()
|
|
q.Set("error", string(authErr.ErrorCode))
|
|
q.Set("error_description", authErr.ErrorDescription)
|
|
q.Set("state", authErr.State)
|
|
redirect.RawQuery = q.Encode()
|
|
ctx.Redirect(redirect.String(), 302)
|
|
}
|