support Gitea OAuth 2.0 authentication

pkg/auth/oauth2/gitea_oauth2_datasource.go

@@ -0,0 +1,87 @@
+package oauth2
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/mayswind/ezbookkeeping/pkg/core"
+	"github.com/mayswind/ezbookkeeping/pkg/errs"
+	"github.com/mayswind/ezbookkeeping/pkg/log"
+)
+
+type giteaUserInfoResponse struct {
+	Login    string `json:"login"`
+	FullName string `json:"full_name"`
+	Email    string `json:"email"`
+}
+
+// GiteaOAuth2DataSource represents Gitea OAuth 2.0 data source
+type GiteaOAuth2DataSource struct {
+	CommonOAuth2DataSource
+	baseUrl string
+}
+
+// GetAuthUrl returns the authentication url of the Gitea data source
+func (s *GiteaOAuth2DataSource) GetAuthUrl() string {
+	// Reference: https://docs.gitea.com/development/oauth2-provider
+	return s.baseUrl + "login/oauth/authorize"
+}
+
+// GetTokenUrl returns the token url of the Gitea data source
+func (s *GiteaOAuth2DataSource) GetTokenUrl() string {
+	// Reference: https://docs.gitea.com/development/oauth2-provider
+	return s.baseUrl + "login/oauth/access_token"
+}
+
+// GetUserInfoRequest returns the user info request of the Gitea data source
+func (s *GiteaOAuth2DataSource) GetUserInfoRequest() (*http.Request, error) {
+	// Reference: https://gitea.com/api/swagger#/user/userGetCurrent
+	req, err := http.NewRequest("GET", s.baseUrl+"api/v1/user", nil)
+
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Accept", "application/json")
+	return req, nil
+}
+
+// GetScopes returns the scopes required by the Gitea provider
+func (s *GiteaOAuth2DataSource) GetScopes() []string {
+	return []string{"read:user"}
+}
+
+// ParseUserInfo returns the user info by parsing the response body
+func (s *GiteaOAuth2DataSource) ParseUserInfo(c core.Context, body []byte) (*OAuth2UserInfo, error) {
+	userInfoResp := &giteaUserInfoResponse{}
+	err := json.Unmarshal(body, &userInfoResp)
+
+	if err != nil {
+		log.Warnf(c, "[gitea_oauth2_datasource.ParseUserInfo] failed to parse user profile response body, because %s", err.Error())
+		return nil, errs.ErrCannotRetrieveUserInfo
+	}
+
+	if userInfoResp.Login == "" {
+		log.Warnf(c, "[gitea_oauth2_datasource.ParseUserInfo] invalid user profile response body")
+		return nil, errs.ErrCannotRetrieveUserInfo
+	}
+
+	return &OAuth2UserInfo{
+		UserName: userInfoResp.Login,
+		Email:    userInfoResp.Email,
+		NickName: userInfoResp.FullName,
+	}, nil
+}
+
+// NewGiteaOAuth2Provider creates a new Gitea OAuth 2.0 provider instance
+func NewGiteaOAuth2Provider(baseUrl string) OAuth2Provider {
+	if baseUrl[len(baseUrl)-1] != '/' {
+		baseUrl += "/"
+	}
+
+	return &CommonOAuth2Provider{
+		dataSource: &GiteaOAuth2DataSource{
+			baseUrl: baseUrl,
+		},
+	}
+}