add api/v1/instance info handler + instance model (#18)

internal/api/client/instance/instance.go

@@ -0,0 +1,38 @@
+package instance
+
+import (
+	"net/http"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/message"
+	"github.com/superseriousbusiness/gotosocial/internal/router"
+)
+
+const (
+	// InstanceInformationPath
+	InstanceInformationPath = "api/v1/instance"
+)
+
+// Module implements the ClientModule interface
+type Module struct {
+	config    *config.Config
+	processor message.Processor
+	log       *logrus.Logger
+}
+
+// New returns a new instance information module
+func New(config *config.Config, processor message.Processor, log *logrus.Logger) api.ClientModule {
+	return &Module{
+		config:    config,
+		processor: processor,
+		log:       log,
+	}
+}
+
+// Route satisfies the ClientModule interface
+func (m *Module) Route(s router.Router) error {
+	s.AttachHandler(http.MethodGet, InstanceInformationPath, m.InstanceInformationGETHandler)
+	return nil
+}

internal/api/client/instance/instanceget.go

@@ -0,0 +1,20 @@
+package instance
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (m *Module) InstanceInformationGETHandler(c *gin.Context) {
+	l := m.log.WithField("func", "InstanceInformationGETHandler")
+
+	instance, err := m.processor.InstanceGet(m.config.Host)
+	if err != nil {
+		l.Debugf("error getting instance from processor: %s", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "internal server error"})
+		return
+	}
+
+	c.JSON(http.StatusOK, instance)
+}

internal/api/model/instance.go

@@ -23,9 +23,9 @@ type Instance struct {
 	// REQUIRED
 
 	// The domain name of the instance.
-	URI string `json:"uri"`
+	URI string `json:"uri,omitempty"`
 	// The title of the website.
-	Title string `json:"title"`
+	Title string `json:"title,omitempty"`
 	// Admin-defined description of the Mastodon site.
 	Description string `json:"description"`
 	// A shorter description defined by the admin.
@@ -33,9 +33,9 @@ type Instance struct {
 	// An email that may be contacted for any inquiries.
 	Email string `json:"email"`
 	// The version of Mastodon installed on the instance.
-	Version string `json:"version"`
+	Version string `json:"version,omitempty"`
 	// Primary langauges of the website and its staff.
-	Languages []string `json:"languages"`
+	Languages []string `json:"languages,omitempty"`
 	// Whether registrations are enabled.
 	Registrations bool `json:"registrations"`
 	// Whether registrations require moderator approval.
@@ -43,16 +43,16 @@ type Instance struct {
 	// Whether invites are enabled.
 	InvitesEnabled bool `json:"invites_enabled"`
 	// URLs of interest for clients apps.
-	URLS *InstanceURLs `json:"urls"`
+	URLS *InstanceURLs `json:"urls,omitempty"`
 	// Statistics about how much information the instance contains.
-	Stats *InstanceStats `json:"stats"`
+	Stats *InstanceStats `json:"stats,omitempty"`
-
-	// OPTIONAL
-
 	// Banner image for the website.
-	Thumbnail string `json:"thumbnail,omitempty"`
+	Thumbnail string `json:"thumbnail"`
 	// A user that can be contacted, as an alternative to email.
 	ContactAccount *Account `json:"contact_account,omitempty"`
+	// What's the maximum allowed length of a post on this instance?
+	// This is provided for compatibility with Tusky.
+	MaxTootChars uint `json:"max_toot_chars"`
 }
 
 // InstanceURLs represents URLs necessary for successfully connecting to the instance as a user. See https://docs.joinmastodon.org/entities/instance/

internal/db/db.go

@@ -117,6 +117,11 @@ type DB interface {
 	// This is needed for things like serving files that belong to the instance and not an individual user/account.
 	CreateInstanceAccount() error
 
+	// CreateInstanceInstance creates an instance in the database with the same domain as the instance host value.
+	// Ie., if the instance is hosted at 'example.org' the instance will have a domain of 'example.org'.
+	// This is needed for things like serving instance information through /api/v1/instance
+	CreateInstanceInstance() error
+
 	// GetAccountByUserID is a shortcut for the common action of fetching an account corresponding to a user ID.
 	// The given account pointer will be set to the result of the query, whatever it is.
 	// In case of no entries, a 'no entries' error will be returned

internal/db/pg.go

@@ -307,17 +307,54 @@ func (ps *postgresService) DeleteWhere(key string, value interface{}, i interfac
 
 func (ps *postgresService) CreateInstanceAccount() error {
 	username := ps.config.Host
-	instanceAccount := &gtsmodel.Account{
+	key, err := rsa.GenerateKey(rand.Reader, 2048)
-		Username: username,
+	if err != nil {
+		ps.log.Errorf("error creating new rsa key: %s", err)
+		return err
 	}
-	inserted, err := ps.conn.Model(instanceAccount).Where("username = ?", username).SelectOrInsert()
+
+	newAccountURIs := util.GenerateURIsForAccount(username, ps.config.Protocol, ps.config.Host)
+	a := &gtsmodel.Account{
+		Username:              ps.config.Host,
+		DisplayName:           username,
+		URL:                   newAccountURIs.UserURL,
+		PrivateKey:            key,
+		PublicKey:             &key.PublicKey,
+		PublicKeyURI:          newAccountURIs.PublicKeyURI,
+		ActorType:             gtsmodel.ActivityStreamsPerson,
+		URI:                   newAccountURIs.UserURI,
+		InboxURI:              newAccountURIs.InboxURI,
+		OutboxURI:             newAccountURIs.OutboxURI,
+		FollowersURI:          newAccountURIs.FollowersURI,
+		FollowingURI:          newAccountURIs.FollowingURI,
+		FeaturedCollectionURI: newAccountURIs.CollectionURI,
+	}
+	inserted, err := ps.conn.Model(a).Where("username = ?", username).SelectOrInsert()
 	if err != nil {
 		return err
 	}
 	if inserted {
-		ps.log.Infof("created instance account %s with id %s", username, instanceAccount.ID)
+		ps.log.Infof("created instance account %s with id %s", username, a.ID)
 	} else {
-		ps.log.Infof("instance account %s already exists with id %s", username, instanceAccount.ID)
+		ps.log.Infof("instance account %s already exists with id %s", username, a.ID)
+	}
+	return nil
+}
+
+func (ps *postgresService) CreateInstanceInstance() error {
+	i := &gtsmodel.Instance{
+		Domain: ps.config.Host,
+		Title: ps.config.Host,
+		URI: fmt.Sprintf("%s://%s", ps.config.Protocol, ps.config.Host),
+	}
+	inserted, err := ps.conn.Model(i).Where("domain = ?", ps.config.Host).SelectOrInsert()
+	if err != nil {
+		return err
+	}
+	if inserted {
+		ps.log.Infof("created instance instance %s with id %s", ps.config.Host, i.ID)
+	} else {
+		ps.log.Infof("instance instance %s already exists with id %s",  ps.config.Host, i.ID)
 	}
 	return nil
 }

internal/gotosocial/actions.go

@@ -34,6 +34,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/app"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/auth"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/fileserver"
+	"github.com/superseriousbusiness/gotosocial/internal/api/client/instance"
 	mediaModule "github.com/superseriousbusiness/gotosocial/internal/api/client/media"
 	"github.com/superseriousbusiness/gotosocial/internal/api/client/status"
 	"github.com/superseriousbusiness/gotosocial/internal/api/security"
@@ -68,6 +69,7 @@ var models []interface{} = []interface{}{
 	&gtsmodel.Tag{},
 	&gtsmodel.User{},
 	&gtsmodel.Emoji{},
+	&gtsmodel.Instance{},
 	&oauth.Token{},
 	&oauth.Client{},
 }
@@ -105,6 +107,7 @@ var Run action.GTSAction = func(ctx context.Context, c *config.Config, log *logr
 	// build client api modules
 	authModule := auth.New(c, dbService, oauthServer, log)
 	accountModule := account.New(c, processor, log)
+	instanceModule := instance.New(c, processor, log)
 	appsModule := app.New(c, processor, log)
 	mm := mediaModule.New(c, processor, log)
 	fileServerModule := fileserver.New(c, processor, log)
@@ -119,6 +122,7 @@ var Run action.GTSAction = func(ctx context.Context, c *config.Config, log *logr
 
 		// now everything else
 		accountModule,
+		instanceModule,
 		appsModule,
 		mm,
 		fileServerModule,
@@ -142,6 +146,10 @@ var Run action.GTSAction = func(ctx context.Context, c *config.Config, log *logr
 		return fmt.Errorf("error creating instance account: %s", err)
 	}
 
+	if err := dbService.CreateInstanceInstance(); err != nil {
+		return fmt.Errorf("error creating instance instance: %s", err)
+	}
+
 	gts, err := New(dbService, router, federator, c)
 	if err != nil {
 		return fmt.Errorf("error creating gotosocial service: %s", err)

internal/gtsmodel/instance.go

@@ -0,0 +1,33 @@
+package gtsmodel
+
+import "time"
+
+// Instance represents a federated instance, either local or remote.
+type Instance struct {
+	// ID of this instance in the database
+	ID string `pg:"type:uuid,default:gen_random_uuid(),pk,notnull,unique"`
+	// Instance domain eg example.org
+	Domain string `pg:",notnull,unique"`
+	// Title of this instance as it would like to be displayed.
+	Title string
+	// base URI of this instance eg https://example.org
+	URI string `pg:",notnull,unique"`
+	// When was this instance created in the db?
+	CreatedAt time.Time `pg:"type:timestamp,notnull,default:now()"`
+	// When was this instance last updated in the db?
+	UpdatedAt   time.Time `pg:"type:timestamp,notnull,default:now()"`
+	// When was this instance suspended, if at all?
+	SuspendedAt time.Time
+	// ID of any existing domain block for this instance in the database
+	DomainBlockID string
+	// Short description of this instance
+	ShortDescription string
+	// Longer description of this instance
+	Description string
+	// Contact email address for this instance
+	ContactEmail string
+	// Contact account ID in the database for this instance
+	ContactAccountID string
+	// Reputation score of this instance
+	Reputation int64 `pg:",notnull,default:0"`
+}

internal/message/instanceprocess.go

@@ -0,0 +1,22 @@
+package message
+
+import (
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) InstanceGet(domain string) (*apimodel.Instance, ErrorWithCode) {
+	i := &gtsmodel.Instance{}
+	if err := p.db.GetWhere("domain", domain, i); err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("db error fetching instance %s: %s", p.config.Host, err))
+	}
+
+	ai, err := p.tc.InstanceToMasto(i)
+	if err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("error converting instance to api representation: %s", err))
+	}
+
+	return  ai, nil
+}

internal/message/processor.go

@@ -68,9 +68,20 @@ type Processor interface {
 	// AccountUpdate processes the update of an account with the given form
 	AccountUpdate(authed *oauth.Auth, form *apimodel.UpdateCredentialsRequest) (*apimodel.Account, error)
 
+	// AdminEmojiCreate handles the creation of a new instance emoji by an admin, using the given form.
+	AdminEmojiCreate(authed *oauth.Auth, form *apimodel.EmojiCreateRequest) (*apimodel.Emoji, error)
+
 	// AppCreate processes the creation of a new API application
 	AppCreate(authed *oauth.Auth, form *apimodel.ApplicationCreateRequest) (*apimodel.Application, error)
 
+	// InstanceGet retrieves instance information for serving at api/v1/instance
+	InstanceGet(domain string) (*apimodel.Instance, ErrorWithCode)
+
+	// MediaCreate handles the creation of a media attachment, using the given form.
+	MediaCreate(authed *oauth.Auth, form *apimodel.AttachmentRequest) (*apimodel.Attachment, error)
+	// MediaGet handles the fetching of a media attachment, using the given request form.
+	MediaGet(authed *oauth.Auth, form *apimodel.GetContentRequestForm) (*apimodel.Content, error)
+
 	// StatusCreate processes the given form to create a new status, returning the api model representation of that status if it's OK.
 	StatusCreate(authed *oauth.Auth, form *apimodel.AdvancedStatusCreateForm) (*apimodel.Status, error)
 	// StatusDelete processes the delete of a given status, returning the deleted status if the delete goes through.
@@ -86,13 +97,6 @@ type Processor interface {
 	// StatusUnfave processes the unfaving of a given status, returning the updated status if the fave goes through.
 	StatusUnfave(authed *oauth.Auth, targetStatusID string) (*apimodel.Status, error)
 
-	// MediaCreate handles the creation of a media attachment, using the given form.
-	MediaCreate(authed *oauth.Auth, form *apimodel.AttachmentRequest) (*apimodel.Attachment, error)
-	// MediaGet handles the fetching of a media attachment, using the given request form.
-	MediaGet(authed *oauth.Auth, form *apimodel.GetContentRequestForm) (*apimodel.Content, error)
-	// AdminEmojiCreate handles the creation of a new instance emoji by an admin, using the given form.
-	AdminEmojiCreate(authed *oauth.Auth, form *apimodel.EmojiCreateRequest) (*apimodel.Emoji, error)
-
 	/*
 		FEDERATION API-FACING PROCESSING FUNCTIONS
 		These functions are intended to be called when the federating client needs an immediate (ie., synchronous) reply

internal/typeutils/converter.go

@@ -74,6 +74,9 @@ type TypeConverter interface {
 	// VisToMasto converts a gts visibility into its mastodon equivalent
 	VisToMasto(m gtsmodel.Visibility) model.Visibility
 
+	// InstanceToMasto converts a gts instance into its mastodon equivalent for serving at /api/v1/instance
+	InstanceToMasto(i *gtsmodel.Instance) (*model.Instance, error)
+
 	/*
 		FRONTEND (mastodon) MODEL TO INTERNAL (gts) MODEL
 	*/

internal/typeutils/internaltofrontend.go

@@ -551,3 +551,33 @@ func (c *converter) VisToMasto(m gtsmodel.Visibility) model.Visibility {
 	}
 	return ""
 }
+
+func (c *converter) InstanceToMasto(i *gtsmodel.Instance) (*model.Instance, error) {
+	mi := &model.Instance{
+		URI: i.URI,
+		Title: i.Title,
+		Description: i.Description,
+		ShortDescription: i.ShortDescription,
+		Email: i.ContactEmail,
+	}
+
+	if i.Domain == c.config.Host {
+		mi.Registrations = c.config.AccountsConfig.OpenRegistration
+		mi.ApprovalRequired = c.config.AccountsConfig.RequireApproval
+		mi.InvitesEnabled = false // TODO
+		mi.MaxTootChars = uint(c.config.StatusesConfig.MaxChars)
+	}
+
+	// contact account is optional but let's try to get it
+	if i.ContactAccountID != "" {
+		ia := &gtsmodel.Account{}
+		if err := c.db.GetByID(i.ContactAccountID, ia); err == nil {
+			ma, err := c.AccountToMastoPublic(ia)
+			if err == nil {
+				mi.ContactAccount = ma
+			}
+		}
+	}
+
+	return mi, nil
+}