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182 lines
5.6 KiB
Go
182 lines
5.6 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package web
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"github.com/gin-gonic/gin"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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)
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func (m *Module) threadGETHandler(c *gin.Context) {
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ctx := c.Request.Context()
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// We'll need the instance later, and we can also use it
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// before then to make it easier to return a web error.
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instance, errWithCode := m.processor.InstanceGetV1(ctx)
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if errWithCode != nil {
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apiutil.WebErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
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return
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}
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// Return instance we already got from the db,
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// don't try to fetch it again when erroring.
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instanceGet := func(ctx context.Context) (*apimodel.InstanceV1, gtserror.WithCode) {
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return instance, nil
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}
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// Parse account targetUsername and status ID from the URL.
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targetUsername, errWithCode := apiutil.ParseUsername(c.Param(apiutil.UsernameKey))
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if errWithCode != nil {
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apiutil.WebErrorHandler(c, errWithCode, instanceGet)
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return
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}
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targetStatusID, errWithCode := apiutil.ParseWebStatusID(c.Param(apiutil.WebStatusIDKey))
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if errWithCode != nil {
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apiutil.WebErrorHandler(c, errWithCode, instanceGet)
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return
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}
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// Normalize requested username + status ID:
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//
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// - Usernames on our instance are (currently) always lowercase.
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// - StatusIDs on our instance are (currently) always ULIDs.
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//
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// todo: Update this logic when different username patterns
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// are allowed, and/or when status slugs are introduced.
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targetUsername = strings.ToLower(targetUsername)
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targetStatusID = strings.ToUpper(targetStatusID)
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// Check what type of content is being requested. If we're getting an AP
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// request on this endpoint we should render the AP representation instead.
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accept, err := apiutil.NegotiateAccept(c, apiutil.HTMLOrActivityPubHeaders...)
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if err != nil {
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apiutil.WebErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), instanceGet)
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return
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}
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if accept == string(apiutil.AppActivityJSON) || accept == string(apiutil.AppActivityLDJSON) {
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// AP status representation has been requested.
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m.returnAPStatus(c, targetUsername, targetStatusID, accept, instanceGet)
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return
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}
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// text/html has been requested. Proceed with getting the web view of the status.
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// Fetch the target account so we can do some checks on it.
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targetAccount, errWithCode := m.processor.Account().GetWeb(ctx, targetUsername)
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if errWithCode != nil {
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apiutil.WebErrorHandler(c, errWithCode, instanceGet)
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return
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}
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// If target account is suspended, this page should not be visible.
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if targetAccount.Suspended {
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err := fmt.Errorf("target account %s is suspended", targetUsername)
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apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
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return
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}
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// Get the thread context. This will fetch the target status as well.
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context, errWithCode := m.processor.Status().WebContextGet(ctx, targetStatusID)
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if errWithCode != nil {
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apiutil.WebErrorHandler(c, errWithCode, instanceGet)
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return
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}
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// Ensure status actually belongs to target account.
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if context.Status.Account.ID != targetAccount.ID {
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err := fmt.Errorf("target account %s does not own status %s", targetUsername, targetStatusID)
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apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
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return
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}
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// Prepare stylesheets for thread.
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stylesheets := make([]string, 0, 6)
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// Basic thread stylesheets.
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stylesheets = append(
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stylesheets,
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[]string{
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cssFA,
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cssStatus,
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cssThread,
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}...,
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)
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// User-selected theme if set.
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if theme := targetAccount.Theme; theme != "" {
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stylesheets = append(
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stylesheets,
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themesPathPrefix+"/"+theme,
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)
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}
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// Custom CSS for this user last in cascade.
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stylesheets = append(
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stylesheets,
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"/@"+targetAccount.Username+"/custom.css",
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)
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page := apiutil.WebPage{
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Template: "thread.tmpl",
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Instance: instance,
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OGMeta: apiutil.OGBase(instance).WithStatus(context.Status),
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Stylesheets: stylesheets,
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Javascript: []string{jsFrontend},
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Extra: map[string]any{
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"context": context,
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},
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}
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apiutil.TemplateWebPage(c, page)
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}
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// returnAPStatus returns an ActivityPub representation of target status,
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// created by targetUsername. It will do http signature authentication.
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func (m *Module) returnAPStatus(
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c *gin.Context,
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targetUsername string,
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targetStatusID string,
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accept string,
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instanceGet func(ctx context.Context) (*apimodel.InstanceV1, gtserror.WithCode),
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) {
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status, errWithCode := m.processor.Fedi().StatusGet(c.Request.Context(), targetUsername, targetStatusID)
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if errWithCode != nil {
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apiutil.WebErrorHandler(c, errWithCode, instanceGet)
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return
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}
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b, err := json.Marshal(status)
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if err != nil {
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err := gtserror.Newf("could not marshal json: %w", err)
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apiutil.WebErrorHandler(c, gtserror.NewErrorInternalError(err), instanceGet)
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return
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}
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c.Data(http.StatusOK, accept, b)
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}
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