refactored common oauth 2.0 provider and add unit tests for nextcloud oauth 2.0 data source

pkg/auth/oauth2/common_oauth2_provider.go

@@ -0,0 +1,78 @@
+package oauth2
+
+import (
+	"io"
+	"net/http"
+
+	"github.com/mayswind/ezbookkeeping/pkg/core"
+	"github.com/mayswind/ezbookkeeping/pkg/errs"
+	"github.com/mayswind/ezbookkeeping/pkg/log"
+)
+
+// CommonOAuth2Provider represents common OAuth 2.0 provider
+type CommonOAuth2Provider struct {
+	OAuth2Provider
+	dataSource CommonOAuth2DataSource
+}
+
+// CommonOAuth2DataSource defines the structure of OAuth 2.0 data source
+type CommonOAuth2DataSource interface {
+	// GetAuthUrl returns the authentication url of the data source
+	GetAuthUrl() string
+
+	// GetTokenUrl returns the token url of the data source
+	GetTokenUrl() string
+
+	// GetUserInfoRequest returns the user info request of the data source
+	GetUserInfoRequest() (*http.Request, error)
+
+	// GetScopes returns the scopes required by the data source
+	GetScopes() []string
+
+	// ParseUserInfo returns the user info by parsing the response body
+	ParseUserInfo(c core.Context, body []byte) (*OAuth2UserInfo, error)
+}
+
+// GetAuthUrl returns the authentication url of the common OAuth 2.0 provider
+func (p *CommonOAuth2Provider) GetAuthUrl() string {
+	return p.dataSource.GetAuthUrl()
+}
+
+// GetTokenUrl returns the token url of the common OAuth 2.0 provider
+func (p *CommonOAuth2Provider) GetTokenUrl() string {
+	return p.dataSource.GetTokenUrl()
+}
+
+// GetScopes returns the scopes required by the common OAuth 2.0 provider
+func (p *CommonOAuth2Provider) GetScopes() []string {
+	return p.dataSource.GetScopes()
+}
+
+// GetUserInfo returns the user info by the common OAuth 2.0 provider
+func (p *CommonOAuth2Provider) GetUserInfo(c core.Context, oauth2Client *http.Client) (*OAuth2UserInfo, error) {
+	req, err := p.dataSource.GetUserInfoRequest()
+
+	if err != nil {
+		log.Errorf(c, "[common_oauth2_provider.GetUserInfo] failed to get user info request, because %s", err.Error())
+		return nil, errs.ErrFailedToRequestRemoteApi
+	}
+
+	resp, err := oauth2Client.Do(req)
+
+	if err != nil {
+		log.Errorf(c, "[common_oauth2_provider.GetUserInfo] failed to get user info response, because %s", err.Error())
+		return nil, errs.ErrFailedToRequestRemoteApi
+	}
+
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+
+	log.Debugf(c, "[common_oauth2_provider.GetUserInfo] response is %s", body)
+
+	if resp.StatusCode != 200 {
+		log.Errorf(c, "[common_oauth2_provider.GetUserInfo] failed to get user info response, because response code is %d", resp.StatusCode)
+		return nil, errs.ErrFailedToRequestRemoteApi
+	}
+
+	return p.dataSource.ParseUserInfo(c, body)
+}