gotosocial/internal/web/thread.go

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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package web
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"github.com/gin-gonic/gin"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
)
func (m *Module) threadGETHandler(c *gin.Context) {
ctx := c.Request.Context()
// We'll need the instance later, and we can also use it
// before then to make it easier to return a web error.
instance, errWithCode := m.processor.InstanceGetV1(ctx)
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
return
}
// Return instance we already got from the db,
// don't try to fetch it again when erroring.
instanceGet := func(ctx context.Context) (*apimodel.InstanceV1, gtserror.WithCode) {
return instance, nil
}
// Parse account targetUsername and status ID from the URL.
targetUsername, errWithCode := apiutil.ParseUsername(c.Param(apiutil.UsernameKey))
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, instanceGet)
return
}
targetStatusID, errWithCode := apiutil.ParseWebStatusID(c.Param(apiutil.WebStatusIDKey))
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, instanceGet)
return
}
// Normalize requested username + status ID:
//
// - Usernames on our instance are (currently) always lowercase.
// - StatusIDs on our instance are (currently) always ULIDs.
//
// todo: Update this logic when different username patterns
// are allowed, and/or when status slugs are introduced.
targetUsername = strings.ToLower(targetUsername)
targetStatusID = strings.ToUpper(targetStatusID)
// Check what type of content is being requested. If we're getting an AP
// request on this endpoint we should render the AP representation instead.
accept, err := apiutil.NegotiateAccept(c, apiutil.HTMLOrActivityPubHeaders...)
if err != nil {
apiutil.WebErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), instanceGet)
return
}
if accept == string(apiutil.AppActivityJSON) || accept == string(apiutil.AppActivityLDJSON) {
// AP status representation has been requested.
m.returnAPStatus(c, targetUsername, targetStatusID, accept, instanceGet)
return
}
// text/html has been requested. Proceed with getting the web view of the status.
// Don't require auth for web endpoints, but do take it if it was provided.
// authed.Account might end up nil here, but that's fine in case of public pages.
authed, err := oauth.Authed(c, false, false, false, false)
if err != nil {
apiutil.WebErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGetV1)
return
}
// Fetch the target account so we can do some checks on it.
targetAccount, errWithCode := m.processor.Account().GetLocalByUsername(ctx, authed.Account, targetUsername)
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, instanceGet)
return
}
// If target account is suspended, this page should not be visible.
if targetAccount.Suspended {
err := fmt.Errorf("target account %s is suspended", targetUsername)
apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
return
}
// Get the status itself from the processor using provided ID and authorization (if any).
status, errWithCode := m.processor.Status().WebGet(ctx, targetStatusID)
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, instanceGet)
return
}
// Ensure status actually belongs to target account.
if status.GetAccountID() != targetAccount.ID {
err := fmt.Errorf("target account %s does not own status %s", targetUsername, targetStatusID)
apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
return
}
// Don't render boosts/reblogs as top-level statuses.
if status.Reblog != nil {
err := errors.New("status is a boost wrapper / reblog")
apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
return
}
// Fill in the rest of the thread context.
context, errWithCode := m.processor.Status().WebContextGet(ctx, targetStatusID)
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, instanceGet)
return
}
// Prepare stylesheets for thread.
stylesheets := make([]string, 0, 5)
// Basic thread stylesheets.
stylesheets = append(
stylesheets,
[]string{
cssFA,
cssStatus,
cssThread,
}...,
)
// User-selected theme if set.
if theme := targetAccount.Theme; theme != "" {
stylesheets = append(
stylesheets,
themesPathPrefix+"/"+theme,
)
}
// Custom CSS for this user last in cascade.
stylesheets = append(
stylesheets,
"/@"+targetAccount.Username+"/custom.css",
)
page := apiutil.WebPage{
Template: "thread.tmpl",
Instance: instance,
OGMeta: apiutil.OGBase(instance).WithStatus(status),
Stylesheets: stylesheets,
Javascript: []string{jsFrontend},
Extra: map[string]any{
"status": status,
"context": context,
},
}
apiutil.TemplateWebPage(c, page)
}
// returnAPStatus returns an ActivityPub representation of target status,
// created by targetUsername. It will do http signature authentication.
func (m *Module) returnAPStatus(
c *gin.Context,
targetUsername string,
targetStatusID string,
accept string,
instanceGet func(ctx context.Context) (*apimodel.InstanceV1, gtserror.WithCode),
) {
status, errWithCode := m.processor.Fedi().StatusGet(c.Request.Context(), targetUsername, targetStatusID)
if errWithCode != nil {
apiutil.WebErrorHandler(c, errWithCode, instanceGet)
return
}
b, err := json.Marshal(status)
if err != nil {
err := gtserror.Newf("could not marshal json: %w", err)
apiutil.WebErrorHandler(c, gtserror.NewErrorInternalError(err), instanceGet)
return
}
c.Data(http.StatusOK, accept, b)
}