You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: user.go
    path of file: ./repos/gotosocial/internal/processing/fedi
    
    the code of the file until where you have to start completion: // 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 fedi

import (
	"context"
	"errors"
	"fmt"
	"net/url"

	"github.com/superseriousbusiness/activity/streams/vocab"
	"github.com/superseriousbusiness/gotosocial/internal/ap"
	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
	"github.com/superseriousbusiness/gotosocial/internal/uris"
)

// UserGet handles the getting of a fedi/activitypub representation of a user/account,
// performing authentication before returning a JSON serializable interface to the caller.
func (p *Processor) UserGet(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
	// (Try to) get the requested local account from the db.
	receiver, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUsername, "")
	if err != nil {
		if errors.Is(err, db.ErrNoEntries) {
			// Account just not found w/ this username.
			err := fmt.Errorf("account with username %s not found in the db", requestedUsername)
			return nil, gtserror.NewErrorNotFound(err)
		}

		// Real db error.
		err := fmt.Errorf("db error getting account with username %s: %w", requestedUsername, err)
		return nil, gtserror.NewErrorInternalError(err)
	}

	if uris.IsPublicKeyPath(requestURL) {
		// If request is on a public key path, we don't need to
		// authenticate this request. However, we'll only serve
		// the bare minimum user profile needed for the pubkey.
		//
		// TODO: https://github.com/superseriousbusiness/gotosocial/issues/1186
		minimalPerson, err := p.converter.AccountToASMinimal(ctx, receiver)
		if err != nil {
			err := gtserror.Newf("error converting to minimal account: %w", err)
			return nil, gtserror.NewErrorInternalError(err)
		}

		// Return early 
    
func (p *Processor) UserGet(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
	// (Try to) get the requested local account from the db.
	receiver, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUsername, "")
	if err != nil {
		if errors.Is(err, db.ErrNoEntries) {
			// Account just not found w/ this username.
			err := fmt.Errorf("account with username %s not found in the db", requestedUsername)
			return nil, gtserror.NewErrorNotFound(err)
		}

		// Real db error.
		err := fmt.Errorf("db error getting account with username %s: %w", requestedUsername, err)
		return nil, gtserror.NewErrorInternalError(err)
	}

	if uris.IsPublicKeyPath(requestURL) {
		// If request is on a public key path, we don't need to
		// authenticate this request. However, we'll only serve
		// the bare minimum user profile needed for the pubkey.
		//
		// TODO: https://github.com/superseriousbusiness/gotosocial/issues/1186
		minimalPerson, err := p.converter.AccountToASMinimal(ctx, receiver)
		if err != nil {
			err := gtserror.Newf("error converting to minimal account: %w", err)
			return nil, gtserror.NewErrorInternalError(err)
		}

		// Return early with bare minimum data.
		return data(minimalPerson)
	}

	// If the request is not on a public key path, we want to
	// try to authenticate it before we serve any data, so that
	// we can serve a more complete profile.
	pubKeyAuth, errWithCode := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
	if errWithCode != nil {
		return nil, errWithCode // likely 401
	}

	// Auth passed, generate the proper AP representation.
	person, err := p.converter.AccountToAS(ctx, receiver)
	if err != nil {
		err := gtserror.Newf("error converting account: %w", err)
		return nil, gtserror.NewErrorInternalError(err)
	}

	if pubKeyAuth.Handshaking {
		// If we are currently handshaking with the remote account
		// making the request, then don't be coy: just serve the AP
		// representation of the target account.
		//
		// This handshake check ensures that we don't get stuck in
		// a loop with another GtS instance, where each instance is
		// trying repeatedly to dereference the other account that's
		// making the request before it will reveal its own account.
		//
		// Instead, we end up in an 'I'll show you mine if you show me
		// yours' situation, where we sort of agree to reveal each
		// other's profiles at the same time.
		return data(person)
	}

	// Get requester from auth.
	requester := pubKeyAuth.Owner

	// Check that block does not exist between receiver and requester.
	blocked, err := p.state.DB.IsBlocked(ctx, receiver.ID, requester.ID)
	if err != nil {
		err := gtserror.Newf("error checking block: %w", err)
		return nil, gtserror.NewErrorInternalError(err)
	} else if blocked {
		const text = "block exists between accounts"
		return nil, gtserror.NewErrorForbidden(errors.New(text))
	}

	return data(person)
}