Allow creation of OAuth2 applications for orgs (#18084)

Adds the settings pages to create OAuth2 apps also to the org settings
and allows to create apps for orgs.

Refactoring: the oauth2 related templates are shared for
instance-wide/org/user, and the backend code uses `OAuth2CommonHandlers`
to share code for instance-wide/org/user.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/user/setting/oauth2_common.go

@@ -0,0 +1,150 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package setting
+
+import (
+	"fmt"
+	"net/http"
+
+	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/web"
+	"code.gitea.io/gitea/services/forms"
+)
+
+type OAuth2CommonHandlers struct {
+	OwnerID            int64        // 0 for instance-wide, otherwise OrgID or UserID
+	BasePathList       string       // the base URL for the application list page, eg: "/user/setting/applications"
+	BasePathEditPrefix string       // the base URL for the application edit page, will be appended with app id, eg: "/user/setting/applications/oauth2"
+	TplAppEdit         base.TplName // the template for the application edit page
+}
+
+func (oa *OAuth2CommonHandlers) renderEditPage(ctx *context.Context) {
+	app := ctx.Data["App"].(*auth.OAuth2Application)
+	ctx.Data["FormActionPath"] = fmt.Sprintf("%s/%d", oa.BasePathEditPrefix, app.ID)
+	ctx.HTML(http.StatusOK, oa.TplAppEdit)
+}
+
+// AddApp adds an oauth2 application
+func (oa *OAuth2CommonHandlers) AddApp(ctx *context.Context) {
+	form := web.GetForm(ctx).(*forms.EditOAuth2ApplicationForm)
+	if ctx.HasError() {
+		// go to the application list page
+		ctx.Redirect(oa.BasePathList)
+		return
+	}
+
+	// TODO validate redirect URI
+	app, err := auth.CreateOAuth2Application(ctx, auth.CreateOAuth2ApplicationOptions{
+		Name:         form.Name,
+		RedirectURIs: []string{form.RedirectURI},
+		UserID:       oa.OwnerID,
+	})
+	if err != nil {
+		ctx.ServerError("CreateOAuth2Application", err)
+		return
+	}
+
+	// render the edit page with secret
+	ctx.Flash.Success(ctx.Tr("settings.create_oauth2_application_success"), true)
+	ctx.Data["App"] = app
+	ctx.Data["ClientSecret"], err = app.GenerateClientSecret()
+	if err != nil {
+		ctx.ServerError("GenerateClientSecret", err)
+		return
+	}
+	oa.renderEditPage(ctx)
+}
+
+// EditShow displays the given application
+func (oa *OAuth2CommonHandlers) EditShow(ctx *context.Context) {
+	app, err := auth.GetOAuth2ApplicationByID(ctx, ctx.ParamsInt64("id"))
+	if err != nil {
+		if auth.IsErrOAuthApplicationNotFound(err) {
+			ctx.NotFound("Application not found", err)
+			return
+		}
+		ctx.ServerError("GetOAuth2ApplicationByID", err)
+		return
+	}
+	if app.UID != oa.OwnerID {
+		ctx.NotFound("Application not found", nil)
+		return
+	}
+	ctx.Data["App"] = app
+	oa.renderEditPage(ctx)
+}
+
+// EditSave saves the oauth2 application
+func (oa *OAuth2CommonHandlers) EditSave(ctx *context.Context) {
+	form := web.GetForm(ctx).(*forms.EditOAuth2ApplicationForm)
+
+	if ctx.HasError() {
+		oa.renderEditPage(ctx)
+		return
+	}
+
+	// TODO validate redirect URI
+	var err error
+	if ctx.Data["App"], err = auth.UpdateOAuth2Application(auth.UpdateOAuth2ApplicationOptions{
+		ID:           ctx.ParamsInt64("id"),
+		Name:         form.Name,
+		RedirectURIs: []string{form.RedirectURI},
+		UserID:       oa.OwnerID,
+	}); err != nil {
+		ctx.ServerError("UpdateOAuth2Application", err)
+		return
+	}
+	ctx.Flash.Success(ctx.Tr("settings.update_oauth2_application_success"))
+	ctx.Redirect(oa.BasePathList)
+}
+
+// RegenerateSecret regenerates the secret
+func (oa *OAuth2CommonHandlers) RegenerateSecret(ctx *context.Context) {
+	app, err := auth.GetOAuth2ApplicationByID(ctx, ctx.ParamsInt64("id"))
+	if err != nil {
+		if auth.IsErrOAuthApplicationNotFound(err) {
+			ctx.NotFound("Application not found", err)
+			return
+		}
+		ctx.ServerError("GetOAuth2ApplicationByID", err)
+		return
+	}
+	if app.UID != oa.OwnerID {
+		ctx.NotFound("Application not found", nil)
+		return
+	}
+	ctx.Data["App"] = app
+	ctx.Data["ClientSecret"], err = app.GenerateClientSecret()
+	if err != nil {
+		ctx.ServerError("GenerateClientSecret", err)
+		return
+	}
+	ctx.Flash.Success(ctx.Tr("settings.update_oauth2_application_success"), true)
+	oa.renderEditPage(ctx)
+}
+
+// DeleteApp deletes the given oauth2 application
+func (oa *OAuth2CommonHandlers) DeleteApp(ctx *context.Context) {
+	if err := auth.DeleteOAuth2Application(ctx.ParamsInt64("id"), oa.OwnerID); err != nil {
+		ctx.ServerError("DeleteOAuth2Application", err)
+		return
+	}
+
+	ctx.Flash.Success(ctx.Tr("settings.remove_oauth2_application_success"))
+	ctx.JSON(http.StatusOK, map[string]interface{}{"redirect": oa.BasePathList})
+}
+
+// RevokeGrant revokes the grant
+func (oa *OAuth2CommonHandlers) RevokeGrant(ctx *context.Context) {
+	if err := auth.RevokeOAuth2Grant(ctx, ctx.ParamsInt64("grantId"), oa.OwnerID); err != nil {
+		ctx.ServerError("RevokeOAuth2Grant", err)
+		return
+	}
+
+	ctx.Flash.Success(ctx.Tr("settings.revoke_oauth2_grant_success"))
+	ctx.JSON(http.StatusOK, map[string]interface{}{"redirect": oa.BasePathList})
+}