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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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 user
import (
"context"
"encoding/json"
"fmt"
"net/http"
"github.com/gin-gonic/gin"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
// UsersGETHandler should be served at https://example.org/users/:username.
//
// The goal here is to return the activitypub representation of an account
// in the form of a vocab.ActivityStreamsPerson. This should only be served
// to REMOTE SERVERS that present a valid signature on the GET request, on
// behalf of a user, otherwise we risk leaking information about users publicly.
//
// And of course, the request should be refused if the account or server making the
// request is blocked.
func (m *Module) UsersGETHandler(c *gin.Context) {
l := m.log.WithFields(logrus.Fields{
"func": "UsersGETHandler",
"url": c.Request.RequestURI,
})
requestedUsername := c.Param(UsernameKey)
if requestedUsername == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
return
}
// make sure this actually an AP request
format := c.NegotiateFormat(ActivityPubAcceptHeaders...)
if format == "" {
c.JSON(http.StatusNotAcceptable, gin.H{"error": "could not negotiate format with given Accept header(s)"})
return
}
l.Tracef("negotiated format: %s", format)
// transfer the signature verifier from the gin context to the request context
ctx := c.Request.Context()
verifier, signed := c.Get(string(util.APRequestingPublicKeyVerifier))
if signed {
ctx = context.WithValue(ctx, util.APRequestingPublicKeyVerifier, verifier)
}
user, err := m.processor.GetFediUser(ctx, requestedUsername, c.Request.URL) // GetFediUser handles auth as well
if err != nil {
l.Info(err.Error())
c.JSON(err.Code(), gin.H{"error": err.Safe()})
return
}
b, mErr := json.Marshal(user)
if mErr != nil {
err := fmt.Errorf("could not marshal json: %s", mErr)
l.Error(err)
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
c.Data(http.StatusOK, format, b)
}
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