186 lines
5.8 KiB
Go
186 lines
5.8 KiB
Go
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/ioutil"
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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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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/id"
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)
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func (t *transport) DereferenceInstance(c context.Context, iri *url.URL) (*gtsmodel.Instance, error) {
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l := t.log.WithField("func", "DereferenceInstance")
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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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l.Debugf("trying to dereference instance %s by /api/v1/instance", iri.Host)
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i, err = dereferenceByAPIV1Instance(t, c, iri)
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if err == nil {
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l.Debugf("successfully dereferenced instance using /api/v1/instance")
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return i, nil
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}
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l.Debugf("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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l.Debugf("trying to dereference instance %s by /.well-known/nodeinfo", iri.Host)
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i, err = dereferenceByNodeInfo(t, c, iri)
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if err == nil {
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l.Debugf("successfully dereferenced instance using /.well-known/nodeinfo")
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return i, nil
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}
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l.Debugf("couldn't dereference instance using /.well-known/nodeinfo: %s", err)
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return nil, fmt.Errorf("couldn't dereference instance %s using either /api/v1/instance or /.well-known/nodeinfo", iri.Host)
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}
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func dereferenceByAPIV1Instance(t *transport, c context.Context, iri *url.URL) (*gtsmodel.Instance, error) {
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l := t.log.WithField("func", "dereferenceByAPIV1Instance")
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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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l.Debugf("performing GET to %s", cleanIRI.String())
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req, err := http.NewRequest("GET", cleanIRI.String(), nil)
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if err != nil {
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return nil, err
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}
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req = req.WithContext(c)
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req.Header.Add("Accept", "application/json")
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req.Header.Add("Date", t.clock.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
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req.Header.Add("User-Agent", fmt.Sprintf("%s %s", t.appAgent, t.gofedAgent))
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req.Header.Set("Host", cleanIRI.Host)
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t.getSignerMu.Lock()
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err = t.getSigner.SignRequest(t.privkey, t.pubKeyID, req, nil)
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t.getSignerMu.Unlock()
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if err != nil {
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return nil, err
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}
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resp, err := t.client.Do(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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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("GET request to %s failed (%d): %s", cleanIRI.String(), resp.StatusCode, resp.Status)
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}
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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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.Instance{}
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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: fmt.Sprintf("%s://%s", 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(t *transport, c context.Context, iri *url.URL) (*gtsmodel.Instance, error) {
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l := t.log.WithField("func", "dereferenceByNodeInfo")
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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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l.Debugf("performing GET to %s", cleanIRI.String())
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req, err := http.NewRequest("GET", cleanIRI.String(), nil)
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if err != nil {
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return nil, err
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}
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req = req.WithContext(c)
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req.Header.Add("Accept", "application/json")
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req.Header.Add("Date", t.clock.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
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req.Header.Add("User-Agent", fmt.Sprintf("%s %s", t.appAgent, t.gofedAgent))
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req.Header.Set("Host", cleanIRI.Host)
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t.getSignerMu.Lock()
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err = t.getSigner.SignRequest(t.privkey, t.pubKeyID, req, nil)
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t.getSignerMu.Unlock()
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if err != nil {
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return nil, err
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}
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resp, err := t.client.Do(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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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("GET request to %s failed (%d): %s", cleanIRI.String(), resp.StatusCode, resp.Status)
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}
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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if len(b) == 0 {
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return nil, errors.New("dereferenceByNodeInfo: 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, fmt.Errorf("dereferenceByNodeInfo: could not unmarshal server response as WellKnownResponse: %s", 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") {
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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, fmt.Errorf("dereferenceByNodeInfo: couldn't parse url %s: %s", l.Href, err)
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}
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}
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if nodeinfoHref == nil {
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return nil, errors.New("could not find nodeinfo rel in well known response")
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}
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aaaaaaaaaaaaaaaaa // do the second query
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return nil, errors.New("not yet implemented")
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}
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