344 lines
10 KiB
Go
344 lines
10 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 transport
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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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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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/id"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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"github.com/superseriousbusiness/gotosocial/internal/util"
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"github.com/superseriousbusiness/gotosocial/internal/validate"
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)
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func (t *transport) DereferenceInstance(ctx context.Context, iri *url.URL) (*gtsmodel.Instance, error) {
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var i *gtsmodel.Instance
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var err error
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// First try to dereference using /api/v1/instance.
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// This will provide the most complete picture of an instance, and avoid unnecessary api calls.
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//
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// This will only work with Mastodon-api compatible instances: Mastodon, some Pleroma instances, GoToSocial.
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log.Debugf(ctx, "trying to dereference instance %s by /api/v1/instance", iri.Host)
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i, err = dereferenceByAPIV1Instance(ctx, t, iri)
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if err == nil {
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log.Debugf(ctx, "successfully dereferenced instance using /api/v1/instance")
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return i, nil
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}
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log.Debugf(ctx, "couldn't dereference instance using /api/v1/instance: %s", err)
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// If that doesn't work, try to dereference using /.well-known/nodeinfo.
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// This will involve two API calls and return less info overall, but should be more widely compatible.
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log.Debugf(ctx, "trying to dereference instance %s by /.well-known/nodeinfo", iri.Host)
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i, err = dereferenceByNodeInfo(ctx, t, iri)
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if err == nil {
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log.Debugf(ctx, "successfully dereferenced instance using /.well-known/nodeinfo")
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return i, nil
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}
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log.Debugf(ctx, "couldn't dereference instance using /.well-known/nodeinfo: %s", err)
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// we couldn't dereference the instance using any of the known methods, so just return a minimal representation
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log.Debugf(ctx, "returning minimal representation of instance %s", iri.Host)
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id, err := id.NewRandomULID()
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if err != nil {
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return nil, fmt.Errorf("error creating new id for instance %s: %s", iri.Host, err)
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}
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return >smodel.Instance{
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ID: id,
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Domain: iri.Host,
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URI: iri.String(),
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}, nil
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}
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func dereferenceByAPIV1Instance(ctx context.Context, t *transport, iri *url.URL) (*gtsmodel.Instance, error) {
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cleanIRI := &url.URL{
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Scheme: iri.Scheme,
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Host: iri.Host,
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Path: "api/v1/instance",
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}
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// Build IRI just once
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iriStr := cleanIRI.String()
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req, err := http.NewRequestWithContext(ctx, "GET", iriStr, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Accept", string(apiutil.AppJSON))
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req.Header.Set("Host", cleanIRI.Host)
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resp, err := t.GET(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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// Ensure a non-error status response.
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if resp.StatusCode != http.StatusOK {
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return nil, gtserror.NewFromResponse(resp)
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}
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// Ensure that the incoming request content-type is expected.
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if ct := resp.Header.Get("Content-Type"); !apiutil.JSONContentType(ct) {
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err := gtserror.Newf("non json response type: %s", ct)
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return nil, gtserror.SetMalformed(err)
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}
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b, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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} else if len(b) == 0 {
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return nil, errors.New("response bytes was len 0")
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}
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// try to parse the returned bytes directly into an Instance model
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apiResp := &apimodel.InstanceV1{}
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if err := json.Unmarshal(b, apiResp); err != nil {
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return nil, err
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}
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var contactUsername string
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if apiResp.ContactAccount != nil {
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contactUsername = apiResp.ContactAccount.Username
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}
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ulid, err := id.NewRandomULID()
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if err != nil {
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return nil, err
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}
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i := >smodel.Instance{
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ID: ulid,
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Domain: iri.Host,
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Title: apiResp.Title,
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URI: iri.Scheme + "://" + iri.Host,
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ShortDescription: apiResp.ShortDescription,
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Description: apiResp.Description,
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ContactEmail: apiResp.Email,
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ContactAccountUsername: contactUsername,
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Version: apiResp.Version,
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}
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return i, nil
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}
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func dereferenceByNodeInfo(c context.Context, t *transport, iri *url.URL) (*gtsmodel.Instance, error) {
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niIRI, err := callNodeInfoWellKnown(c, t, iri)
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if err != nil {
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return nil, fmt.Errorf("dereferenceByNodeInfo: error during initial call to well-known nodeinfo: %s", err)
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}
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ni, err := callNodeInfo(c, t, niIRI)
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if err != nil {
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return nil, fmt.Errorf("dereferenceByNodeInfo: error doing second call to nodeinfo uri %s: %s", niIRI.String(), err)
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}
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// we got a response of some kind! take what we can from it...
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id, err := id.NewRandomULID()
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if err != nil {
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return nil, fmt.Errorf("dereferenceByNodeInfo: error creating new id for instance %s: %s", iri.Host, err)
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}
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// this is the bare minimum instance we'll return, and we'll add more stuff to it if we can
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i := >smodel.Instance{
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ID: id,
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Domain: iri.Host,
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URI: iri.String(),
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}
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var title string
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if i, present := ni.Metadata["nodeName"]; present {
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// it's present, check it's a string
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if v, ok := i.(string); ok {
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// it is a string!
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title = v
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}
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}
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i.Title = title
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var shortDescription string
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if i, present := ni.Metadata["nodeDescription"]; present {
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// it's present, check it's a string
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if v, ok := i.(string); ok {
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// it is a string!
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shortDescription = v
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}
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}
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i.ShortDescription = shortDescription
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var contactEmail string
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var contactAccountUsername string
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if i, present := ni.Metadata["maintainer"]; present {
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// it's present, check it's a map
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if v, ok := i.(map[string]string); ok {
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// see if there's an email in the map
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if email, present := v["email"]; present {
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if err := validate.Email(email); err == nil {
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// valid email address
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contactEmail = email
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}
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}
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// see if there's a 'name' in the map
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if name, present := v["name"]; present {
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// name could be just a username, or could be a mention string eg @whatever@aaaa.com
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username, _, err := util.ExtractNamestringParts(name)
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if err == nil {
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// it was a mention string
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contactAccountUsername = username
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} else {
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// not a mention string
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contactAccountUsername = name
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}
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}
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}
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}
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i.ContactEmail = contactEmail
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i.ContactAccountUsername = contactAccountUsername
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var software string
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if ni.Software.Name != "" {
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software = ni.Software.Name
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}
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if ni.Software.Version != "" {
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software = software + " " + ni.Software.Version
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}
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i.Version = software
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return i, nil
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}
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func callNodeInfoWellKnown(ctx context.Context, t *transport, iri *url.URL) (*url.URL, error) {
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cleanIRI := &url.URL{
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Scheme: iri.Scheme,
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Host: iri.Host,
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Path: ".well-known/nodeinfo",
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}
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// Build IRI just once
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iriStr := cleanIRI.String()
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req, err := http.NewRequestWithContext(ctx, "GET", iriStr, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Accept", string(apiutil.AppJSON))
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req.Header.Set("Host", cleanIRI.Host)
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resp, err := t.GET(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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// Ensure a non-error status response.
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if resp.StatusCode != http.StatusOK {
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return nil, gtserror.NewFromResponse(resp)
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}
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// Ensure that the incoming request content-type is expected.
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if ct := resp.Header.Get("Content-Type"); !apiutil.JSONContentType(ct) {
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err := gtserror.Newf("non json response type: %s", ct)
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return nil, gtserror.SetMalformed(err)
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}
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b, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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} else if len(b) == 0 {
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return nil, gtserror.New("response bytes was len 0")
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}
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wellKnownResp := &apimodel.WellKnownResponse{}
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if err := json.Unmarshal(b, wellKnownResp); err != nil {
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return nil, gtserror.Newf("could not unmarshal server response as WellKnownResponse: %w", err)
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}
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// look through the links for the first one that matches the nodeinfo schema, this is what we need
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var nodeinfoHref *url.URL
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for _, l := range wellKnownResp.Links {
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if l.Href == "" || !strings.HasPrefix(l.Rel, "http://nodeinfo.diaspora.software/ns/schema/2") {
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continue
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}
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nodeinfoHref, err = url.Parse(l.Href)
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if err != nil {
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return nil, gtserror.Newf("couldn't parse url %s: %w", l.Href, err)
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}
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}
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if nodeinfoHref == nil {
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return nil, gtserror.New("could not find nodeinfo rel in well known response")
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}
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return nodeinfoHref, nil
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}
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func callNodeInfo(ctx context.Context, t *transport, iri *url.URL) (*apimodel.Nodeinfo, error) {
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// Build IRI just once
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iriStr := iri.String()
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req, err := http.NewRequestWithContext(ctx, "GET", iriStr, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Accept", string(apiutil.AppJSON))
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req.Header.Set("Host", iri.Host)
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resp, err := t.GET(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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// Ensure a non-error status response.
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if resp.StatusCode != http.StatusOK {
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return nil, gtserror.NewFromResponse(resp)
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}
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// Ensure that the incoming request content-type is expected.
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if ct := resp.Header.Get("Content-Type"); !apiutil.NodeInfo2ContentType(ct) {
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err := gtserror.Newf("non nodeinfo schema 2.0 response: %s", ct)
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return nil, gtserror.SetMalformed(err)
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}
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b, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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} else if len(b) == 0 {
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return nil, gtserror.New("response bytes was len 0")
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}
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niResp := &apimodel.Nodeinfo{}
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if err := json.Unmarshal(b, niResp); err != nil {
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return nil, gtserror.Newf("could not unmarshal server response as Nodeinfo: %w", err)
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}
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return niResp, nil
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}
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