Refactor server code (#407)

internal/auth/oauth/provider.go

@@ -0,0 +1,93 @@
+package oauth
+
+import (
+	"fmt"
+	"github.com/markbates/goth"
+	"github.com/markbates/goth/gothic"
+	"github.com/rs/zerolog/log"
+	"github.com/thomiceli/opengist/internal/db"
+	"github.com/thomiceli/opengist/internal/web/context"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+const (
+	GitHubProviderString = "github"
+	GitLabProviderString = "gitlab"
+	GiteaProviderString  = "gitea"
+	OpenIDConnectString  = "openid-connect"
+)
+
+type Provider interface {
+	RegisterProvider() error
+	BeginAuthHandler(ctx *context.Context)
+	UserHasProvider(user *db.User) bool
+}
+
+type CallbackProvider interface {
+	GetProvider() string
+	GetProviderUser() *goth.User
+	GetProviderUserID(user *db.User) bool
+	GetProviderUserSSHKeys() ([]string, error)
+	UpdateUserDB(user *db.User)
+}
+
+func DefineProvider(provider string, url string) (Provider, error) {
+	switch provider {
+	case GitHubProviderString:
+		return NewGitHubProvider(url), nil
+	case GitLabProviderString:
+		return NewGitLabProvider(url), nil
+	case GiteaProviderString:
+		return NewGiteaProvider(url), nil
+	case OpenIDConnectString:
+		return NewOIDCProvider(url), nil
+	}
+
+	return nil, fmt.Errorf("unsupported provider %s", provider)
+}
+
+func CompleteUserAuth(ctx *context.Context) (CallbackProvider, error) {
+	user, err := gothic.CompleteUserAuth(ctx.Response(), ctx.Request())
+	if err != nil {
+		return nil, err
+	}
+
+	switch user.Provider {
+	case GitHubProviderString:
+		return NewGitHubCallbackProvider(&user), nil
+	case GitLabProviderString:
+		return NewGitLabCallbackProvider(&user), nil
+	case GiteaProviderString:
+		return NewGiteaCallbackProvider(&user), nil
+	case OpenIDConnectString:
+		return NewOIDCCallbackProvider(&user), nil
+	}
+
+	return nil, fmt.Errorf("unsupported provider %s", user.Provider)
+}
+
+func urlJoin(base string, elem ...string) string {
+	joined, err := url.JoinPath(base, elem...)
+	if err != nil {
+		log.Error().Err(err).Msg("Cannot join url")
+	}
+
+	return joined
+}
+
+func readKeys(response *http.Response) ([]string, error) {
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("could not get user keys %v", err)
+	}
+
+	keys := strings.Split(string(body), "\n")
+	if len(keys[len(keys)-1]) == 0 {
+		keys = keys[:len(keys)-1]
+	}
+
+	return keys, nil
+}