Finished Prototype

entities/activity/activity.go

@@ -0,0 +1,13 @@
+package activity
+
+import "git.nutfactory.org/hoernschen/ActivityPub/entities/object"
+
+type Activity struct {
+	Context   string         `json:"@context,omitempty"`
+	Id        string         `json:"id,omitempty"`
+	Type      string         `json:"type,omitempty"`
+	Actor     string         `json:"actor,omitempty"`
+	Object    *object.Object `json:"object,omitempty"`
+	Published int64          `json:"published,omitempty"`
+	To        string         `json:"to,omitempty"`
+}

entities/activity/activityController.go

@@ -0,0 +1,29 @@
+package activity
+
+import (
+	"time"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/entities/object"
+	"git.nutfactory.org/hoernschen/ActivityPub/utils"
+)
+
+func New(id string, actorOfActivity string, objectOfActivity *object.Object, userId string) (newActivity *Activity) {
+	published := objectOfActivity.Published
+	to := objectOfActivity.To
+	if published == 0 {
+		published = time.Now().Unix()
+	}
+	if to == "" {
+		to = utils.GenerateFollowersUrl(userId)
+	}
+	newActivity = &Activity{
+		Context:   utils.GetDefaultContext(),
+		Id:        id,
+		Type:      "Create",
+		Actor:     actorOfActivity,
+		Object:    objectOfActivity,
+		Published: published,
+		To:        to,
+	}
+	return
+}

entities/actor/actor.go

@@ -0,0 +1,15 @@
+package actor
+
+type Actor struct {
+	Context           string `json:"@context,omitempty"`
+	Id                string `json:"id,omitempty"`
+	Type              string `json:"type,omitempty"`
+	Name              string `json:"name,omitempty"`
+	PreferredUsername string `json:"preferredUsername,omitempty"`
+	Summary           string `json:"summary,omitempty"`
+	Inbox             string `json:"inbox,omitempty"`
+	Outbox            string `json:"outbox,omitempty"`
+	Followers         string `json:"followers,omitempty"`
+	Following         string `json:"following,omitempty"`
+	Liked             string `json:"liked,omitempty"`
+}

entities/actor/actorController.go

@@ -0,0 +1,75 @@
+package actor
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/config"
+	"git.nutfactory.org/hoernschen/ActivityPub/utils"
+)
+
+func New(userId string) (newActor *Actor) {
+	id := utils.GenerateProfileUrl(userId)
+	newActor = GenerateProfile(id, userId)
+	return
+}
+
+func GenerateProfile(id string, userId string) (profile *Actor) {
+	profile = &Actor{
+		Context:           utils.GetDefaultContext(),
+		Id:                id,
+		Name:              userId,
+		PreferredUsername: userId,
+		Type:              "Person",
+		Inbox:             utils.GenerateInboxUrl(userId),
+		Outbox:            utils.GenerateOutboxUrl(userId),
+		Followers:         utils.GenerateFollowersUrl(userId),
+		Following:         utils.GenerateFollowingUrl(userId),
+		Liked:             utils.GenerateLikedUrl(userId),
+	}
+	return
+}
+
+func GetProfileHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", utils.GetContentTypeString())
+	foundActor, err := ReadActor(fmt.Sprintf("%s://%s%s", config.HttpString, config.Homeserver, r.URL.RequestURI()))
+	if foundActor == nil || err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(fmt.Sprintf("Actor not found: %s", err)); err != nil {
+			panic(err)
+		}
+		return
+	}
+	profile := GenerateProfile(foundActor.Id, foundActor.Name)
+	w.WriteHeader(http.StatusOK)
+	if err := json.NewEncoder(w).Encode(profile); err != nil {
+		panic(err)
+	}
+}
+
+func GetProfile(actorId string) (err error, profile *Actor) {
+	client := &http.Client{Timeout: 2 * time.Second}
+	req, err := http.NewRequest(http.MethodGet, actorId, bytes.NewBuffer(nil))
+	if err != nil {
+		return
+	}
+	req.Header["Content-Type"] = []string{utils.GetContentTypeString()}
+	r, err := client.Do(req)
+	if err != nil {
+		return
+	}
+	if r.StatusCode != http.StatusOK {
+		err = utils.HandleHTTPError(r)
+		return
+	} else {
+		decoder := json.NewDecoder(r.Body)
+		err = decoder.Decode(&profile)
+		if err != nil {
+			return
+		}
+	}
+	return
+}

entities/actor/actorDatabaseConnector.go

@@ -0,0 +1,76 @@
+package actor
+
+import (
+	"fmt"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/utils/database"
+)
+
+func CreateActor(actor *Actor) (err error) {
+	sqlStmt := fmt.Sprintf(`INSERT INTO actor
+		(id, type, name, preferredUsername, summary, inbox, outbox, followers, following, liked)
+		VALUES
+		(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`)
+
+	tx, err := database.DB.Begin()
+	if err != nil {
+		return
+	}
+	stmt, err := tx.Prepare(sqlStmt)
+	if err != nil {
+		return
+	}
+	defer stmt.Close()
+	_, err = stmt.Exec(
+		actor.Id,
+		actor.Type,
+		actor.Name,
+		actor.PreferredUsername,
+		actor.Summary,
+		actor.Inbox,
+		actor.Outbox,
+		actor.Followers,
+		actor.Following,
+		actor.Liked,
+	)
+	if err != nil {
+		tx.Rollback()
+		return
+	}
+	tx.Commit()
+	return
+}
+
+func ReadActor(id string) (foundActor *Actor, err error) {
+	queryStmt := fmt.Sprintf(`SELECT id, type, name, preferredUsername, summary, inbox, outbox, followers, following, liked
+		FROM actor
+		WHERE id = '%s'`, id)
+
+	rows, err := database.DB.Query(queryStmt)
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	if rows.Next() {
+		foundActor = &Actor{}
+		err = rows.Scan(
+			&foundActor.Id,
+			&foundActor.Type,
+			&foundActor.Name,
+			&foundActor.PreferredUsername,
+			&foundActor.Summary,
+			&foundActor.Inbox,
+			&foundActor.Outbox,
+			&foundActor.Followers,
+			&foundActor.Following,
+			&foundActor.Liked,
+		)
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}

entities/collection/collection.go

@@ -0,0 +1,5 @@
+package collection
+
+type OutboxResponse struct {
+	Location string `json:"Location,omitempty"`
+}

entities/collection/collectionController.go

@@ -0,0 +1,350 @@
+package collection
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"math/rand"
+	"net/http"
+	"strings"
+	"time"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/config"
+	"git.nutfactory.org/hoernschen/ActivityPub/entities/activity"
+	"git.nutfactory.org/hoernschen/ActivityPub/entities/actor"
+	"git.nutfactory.org/hoernschen/ActivityPub/entities/object"
+	"git.nutfactory.org/hoernschen/ActivityPub/entities/user"
+	"git.nutfactory.org/hoernschen/ActivityPub/utils"
+
+	"github.com/cenkalti/backoff/v4"
+	"github.com/gorilla/mux"
+)
+
+func PostInboxHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", utils.GetContentTypeString())
+	newActivity := &activity.Activity{}
+	err := utils.CheckRequest(r)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(err); err != nil {
+			panic(err)
+		}
+		return
+	}
+	token, err := utils.GetAccessToken(r)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(err); err != nil {
+			panic(err)
+		}
+		return
+	}
+	if token == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Missing Token"); err != nil {
+			panic(err)
+		}
+		return
+	}
+	vars := mux.Vars(r)
+	actorName := vars["actorName"]
+	if actorName == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Missing Actor"); err != nil {
+			panic(err)
+		}
+		return
+	}
+	decoder := json.NewDecoder(r.Body)
+	err = decoder.Decode(&newActivity)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(fmt.Sprintf("Could not parse JSON: %s", err)); err != nil {
+			panic(err)
+		}
+		return
+	}
+
+	if newActivity.Type == "Follow" {
+		err = CreateCollectionObject(utils.GenerateFollowersUrl(actorName), newActivity.Actor)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Collection Object: %s", err)); err != nil {
+				panic(err)
+			}
+			return
+		}
+		log.Printf("%s follows %s", newActivity.Actor, newActivity.To)
+	} else if newActivity.Type == "Create" {
+		foundObject, err := object.ReadObject(newActivity.Object.Id)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Reading Object: %s", err)); err != nil {
+				panic(err)
+			}
+			return
+		}
+		if foundObject == nil {
+			_ = object.CreateObject(newActivity.Object)
+			/*
+				if err != nil {
+					w.WriteHeader(http.StatusBadRequest)
+					if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Object: %s", err)); err != nil {
+						panic(err)
+					}
+					return
+				}
+			*/
+		}
+		_ = CreateCollectionObject(utils.GenerateInboxUrl(actorName), newActivity.Object.Id)
+		/*
+			if err != nil {
+				w.WriteHeader(http.StatusBadRequest)
+				if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Collection Object: %s", err)); err != nil {
+					panic(err)
+				}
+				return
+			}
+		*/
+		log.Printf("%s to %s: %s", newActivity.Actor, newActivity.To, newActivity.Object.Content)
+	} else {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Unsupported Activity Type"); err != nil {
+			panic(err)
+		}
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+}
+
+func PostOutboxHandler(w http.ResponseWriter, r *http.Request) {
+	packetLossNumber := rand.Intn(100)
+	if packetLossNumber > config.Packetloss {
+		w.Header().Set("Content-Type", utils.GetContentTypeString())
+		newActivity := &activity.Activity{}
+		err := utils.CheckRequest(r)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			if err := json.NewEncoder(w).Encode(err); err != nil {
+				panic(err)
+			}
+			return
+		}
+		token, err := utils.GetAccessToken(r)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			if err := json.NewEncoder(w).Encode(err); err != nil {
+				panic(err)
+			}
+			return
+		}
+		foundUser, err := user.ReadUserFromToken(token)
+		if err != nil || foundUser == nil {
+			w.WriteHeader(http.StatusBadRequest)
+			if err := json.NewEncoder(w).Encode(fmt.Sprintf("Unknown Token: %s", err)); err != nil {
+				panic(err)
+			}
+			return
+		}
+		buf := new(bytes.Buffer)
+		buf.ReadFrom(r.Body)
+		err = json.Unmarshal(buf.Bytes(), newActivity)
+		if err != nil || newActivity.Type == "Note" {
+			postedObject := &object.Object{}
+			err = json.Unmarshal(buf.Bytes(), postedObject)
+			if err != nil {
+				w.WriteHeader(http.StatusBadRequest)
+				if err := json.NewEncoder(w).Encode(fmt.Sprintf("Could not parse JSON: %s")); err != nil {
+					panic(err)
+				}
+				return
+			}
+			var newObject *object.Object
+			if postedObject.Id == "" {
+				err, newObject = object.New(
+					postedObject.Type,
+					postedObject.AttributedTo,
+					postedObject.Content,
+					postedObject.Published,
+					postedObject.To,
+					foundUser.Id,
+				)
+				if err != nil {
+					w.WriteHeader(http.StatusBadRequest)
+					if err := json.NewEncoder(w).Encode(fmt.Sprintf("Error Creating Object: %s")); err != nil {
+						panic(err)
+					}
+					return
+				}
+				err = object.CreateObject(newObject)
+				if err != nil {
+					w.WriteHeader(http.StatusBadRequest)
+					if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Object: %s")); err != nil {
+						panic(err)
+					}
+					return
+				}
+			} else {
+				newObject = postedObject
+			}
+			newActivity = activity.New(
+				newObject.Id,
+				newObject.AttributedTo,
+				newObject,
+				foundUser.Id,
+			)
+		}
+
+		var recipients []string
+		if newActivity.Type == "Follow" {
+			err = CreateCollectionObject(utils.GenerateFollowingUrl(foundUser.Id), newActivity.To)
+			if err != nil {
+				w.WriteHeader(http.StatusBadRequest)
+				if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Collection Object: %s")); err != nil {
+					panic(err)
+				}
+				return
+			}
+			recipients = append(recipients, newActivity.To)
+		} else if newActivity.Type == "Create" {
+			err = CreateCollectionObject(utils.GenerateOutboxUrl(foundUser.Id), newActivity.Id)
+			if err != nil {
+				w.WriteHeader(http.StatusBadRequest)
+				if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Collection Object: %s")); err != nil {
+					panic(err)
+				}
+				return
+			}
+			err, recipients = GetReciepientsForActivity(newActivity)
+		}
+
+		for _, recipient := range recipients {
+			log.Printf("Send Activity to Recipient %s", recipient)
+
+			operation := func() error {
+				return SendActivity(newActivity, recipient, token)
+			}
+			notify := func(err error, duration time.Duration) {
+				log.Printf("Error Sending Activity, retrying in %ss: %s", duration/1000000000, err)
+			}
+			backoff.RetryNotify(operation, backoff.WithMaxRetries(backoff.NewExponentialBackOff(), 16), notify)
+
+			//go retryActivity(newActivity, recipient, token)
+		}
+
+		response := OutboxResponse{
+			Location: newActivity.Id,
+		}
+
+		w.WriteHeader(http.StatusOK)
+		if err := json.NewEncoder(w).Encode(response); err != nil {
+			panic(err)
+		}
+	}
+}
+
+/*
+func retryActivity(activityToSend *activity.Activity, recipient string, token string) (err error) {
+	b, cancel := config.BackoffPolicy.Start(context.Background())
+	defer cancel()
+
+	for backoff.Continue(b) {
+		err := SendActivity(activityToSend, recipient, token)
+		if err == nil {
+			return nil
+		}
+	}
+	err = errors.New("Not able to send activity")
+	return
+}
+*/
+
+func GetReciepientsForActivity(activityToSend *activity.Activity) (err error, recipientsWithoutDuplicates []string) {
+	recipients := []string{}
+	if strings.Contains(activityToSend.To, config.Homeserver) {
+		var foundActor *actor.Actor
+		foundActor, err = actor.ReadActor(activityToSend.To)
+		if err != nil {
+			return
+		}
+		if foundActor == nil {
+			var foundCollectionObjects []string
+			foundCollectionObjects, err = ReadCollectionObjects(activityToSend.To)
+			if err != nil {
+				return
+			}
+			if len(foundCollectionObjects) <= 0 {
+				err = errors.New("No Recipients")
+				return
+			}
+			recipients = append(recipients, foundCollectionObjects...)
+		} else {
+			recipients = append(recipients, foundActor.Id)
+		}
+	} else {
+		// Not Implemented
+	}
+	recipientsWithoutDuplicates = utils.RemoveDuplicates(recipients)
+	return
+}
+
+func SendActivity(activityToSend *activity.Activity, recipient string, token string) (err error) {
+	if strings.Contains(recipient, config.Homeserver) {
+		if activityToSend.Type == "Follow" {
+			followers := fmt.Sprintf("%sfollowers/", activityToSend.To)
+			err = CreateCollectionObject(followers, activityToSend.Actor)
+			if err != nil {
+				return
+			}
+			log.Printf("%s follows %s", activityToSend.Actor, activityToSend.To)
+		} else if activityToSend.Type == "Create" {
+			id := activityToSend.Id
+			if activityToSend.Object != nil {
+				id = activityToSend.Object.Id
+			}
+			inbox := fmt.Sprintf("%sinbox", recipient)
+			err = CreateCollectionObject(inbox, id)
+			if err != nil {
+				return
+			}
+			log.Printf("%s to %s: %s", activityToSend.Actor, recipient, activityToSend.Object.Content)
+		}
+		if err != nil {
+			return
+		}
+	} else {
+		activityToSend.To = recipient
+		var profile *actor.Actor
+		err, profile = actor.GetProfile(recipient)
+		if err != nil {
+			return
+		}
+		var reqBody []byte
+		reqBody, err = json.Marshal(activityToSend)
+		if err != nil {
+			return
+		}
+		client := &http.Client{Timeout: 2 * time.Second}
+		var req *http.Request
+		log.Printf("Inbox: %s", profile.Inbox)
+		req, err = http.NewRequest(http.MethodPost, profile.Inbox, bytes.NewBuffer(reqBody))
+		if err != nil {
+			return
+		}
+		req.Header["Content-Type"] = []string{utils.GetContentTypeString()}
+		req.Header["Authorization"] = []string{fmt.Sprintf("Bearer %s")}
+		var res *http.Response
+		res, err = client.Do(req)
+		if err != nil {
+			return
+		}
+		if res.StatusCode != http.StatusOK {
+			err = utils.HandleHTTPError(res)
+			return
+		}
+	}
+	return
+}

entities/collection/collectionDatabaseConnector.go

@@ -0,0 +1,62 @@
+package collection
+
+import (
+	"fmt"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/utils/database"
+)
+
+func CreateCollectionObject(collectionId string, objectId string) (err error) {
+	sqlStmt := fmt.Sprintf(`INSERT INTO collectionObject
+		(collectionId, objectId)
+		VALUES
+		(?, ?)`)
+
+	tx, err := database.DB.Begin()
+	if err != nil {
+		return
+	}
+
+	stmt, err := tx.Prepare(sqlStmt)
+	if err != nil {
+		return
+	}
+	defer stmt.Close()
+
+	_, err = stmt.Exec(
+		collectionId,
+		objectId,
+	)
+	if err != nil {
+		tx.Rollback()
+		return
+	}
+	tx.Commit()
+	return
+}
+
+func ReadCollectionObjects(collectionId string) (collectionObjects []string, err error) {
+	queryStmt := fmt.Sprintf(`SELECT objectId
+		FROM collectionObject
+		WHERE collectionId = '%s'`, collectionId)
+
+	rows, err := database.DB.Query(queryStmt)
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	for rows.Next() {
+		var collectionObject string
+		err = rows.Scan(
+			&collectionObject,
+		)
+		if err != nil {
+			return
+		}
+		collectionObjects = append(collectionObjects, collectionObject)
+	}
+
+	return
+}

entities/object/object.go

@@ -0,0 +1,11 @@
+package object
+
+type Object struct {
+	Context      string `json:"@context,omitempty"`
+	Id           string `json:"id,omitempty"`
+	Type         string `json:"type,omitempty"`
+	AttributedTo string `json:"attributedTo,omitempty"`
+	Content      string `json:"content,omitempty"`
+	Published    int64  `json:"published,omitempty"`
+	To           string `json:"to,omitempty"`
+}

entities/object/objectController.go

@@ -0,0 +1,49 @@
+package object
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/config"
+	"git.nutfactory.org/hoernschen/ActivityPub/utils"
+)
+
+func New(objectType string, attributedTo string, content string, published int64, to string, userId string) (err error, newObject *Object) {
+	err, id := utils.CreateUUID()
+	url := fmt.Sprintf("%s://%s/%s/posts/%s", config.HttpString, config.Homeserver, userId, id)
+	if published == 0 {
+		published = time.Now().Unix()
+	}
+	if attributedTo == "" {
+		attributedTo = utils.GenerateProfileUrl(userId)
+	}
+	newObject = &Object{
+		Context:      utils.GetDefaultContext(),
+		Id:           url,
+		Type:         objectType,
+		AttributedTo: attributedTo,
+		Content:      content,
+		Published:    published,
+		To:           to,
+	}
+	return
+}
+
+func GetPostHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", utils.GetContentTypeString())
+	foundObject, err := ReadObject(r.URL.RequestURI())
+	if foundObject == nil || err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(fmt.Sprintf("Post not found: %s", err)); err != nil {
+			panic(err)
+		}
+		return
+	}
+	foundObject.Context = utils.GetDefaultContext()
+	w.WriteHeader(http.StatusOK)
+	if err := json.NewEncoder(w).Encode(foundObject); err != nil {
+		panic(err)
+	}
+}

entities/object/objectDatabaseConnector.go

@@ -0,0 +1,70 @@
+package object
+
+import (
+	"fmt"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/utils/database"
+)
+
+func CreateObject(object *Object) (err error) {
+	sqlStmt := fmt.Sprintf(`INSERT INTO object
+		(id, type, attributedTo, content, published, toActor)
+		VALUES
+		(?, ?, ?, ?, ?, ?)`)
+
+	tx, err := database.DB.Begin()
+	if err != nil {
+		return
+	}
+
+	stmt, err := tx.Prepare(sqlStmt)
+	if err != nil {
+		return
+	}
+	defer stmt.Close()
+
+	_, err = stmt.Exec(
+		object.Id,
+		object.Type,
+		object.AttributedTo,
+		object.Content,
+		object.Published,
+		object.To,
+	)
+	if err != nil {
+		tx.Rollback()
+		return
+	}
+	tx.Commit()
+	return
+}
+
+func ReadObject(id string) (foundObject *Object, err error) {
+	queryStmt := fmt.Sprintf(`SELECT id, type, attributedTo, content, published, toActor
+		FROM object
+		WHERE id = '%s'`, id)
+
+	rows, err := database.DB.Query(queryStmt)
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	if rows.Next() {
+		foundObject = &Object{}
+		err = rows.Scan(
+			&foundObject.Id,
+			&foundObject.Type,
+			&foundObject.AttributedTo,
+			&foundObject.Content,
+			&foundObject.Published,
+			&foundObject.To,
+		)
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}

entities/user/user.go

@@ -0,0 +1,19 @@
+package user
+
+type User struct {
+	Id       string   `json:"id,omitempty"`
+	Password string   `json:"password,omitempty"`
+	Actor    string   `json:"actor,omitempty"`
+	Sessions []string `json:"sessions,omitempty"`
+}
+
+type RegisterRequest struct {
+	Username string `json:"username,omitempty"`
+	Password string `json:"password,omitempty"`
+}
+
+type RegisterResponse struct {
+	UserId string `json:"user_id,omitempty"`
+	Token  string `json:"token,omitempty"`
+	Actor  string `json:"actor,omitempty"`
+}

entities/user/userController.go

@@ -0,0 +1,103 @@
+package user
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/entities/actor"
+	"git.nutfactory.org/hoernschen/ActivityPub/utils"
+)
+
+func New(id string, password string) (err error, newUser *User) {
+	err, hashedPassword := utils.Hash([]byte(password))
+	if err != nil {
+		return
+	}
+	newUser = &User{
+		Id:       id,
+		Password: hashedPassword,
+	}
+	return
+}
+
+func RegisterHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
+	request := RegisterRequest{}
+	err := utils.CheckRequest(r)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(err); err != nil {
+			panic(err)
+		}
+		return
+	}
+	decoder := json.NewDecoder(r.Body)
+	err = decoder.Decode(&request)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Could not parse JSON: %s"); err != nil {
+			panic(err)
+		}
+		return
+	}
+	err, newUser := New(request.Username, request.Password)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(fmt.Sprintf("Error creating User Object: %s")); err != nil {
+			panic(err)
+		}
+		return
+	}
+	foundUser, err := ReadUser(newUser.Id)
+	if foundUser != nil || err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(fmt.Sprintf("Username already in use: %s", err)); err != nil {
+			panic(err)
+		}
+		return
+	}
+	newActor := actor.New(newUser.Id)
+	err = actor.CreateActor(newActor)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode(fmt.Sprintf("Database Error Creating Actor: %s")); err != nil {
+			panic(err)
+		}
+		return
+	}
+	newUser.Actor = newActor.Id
+	err = CreateUser(newUser)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Database Error Creating User: %s"); err != nil {
+			panic(err)
+		}
+		return
+	}
+	err, token := utils.CreateToken()
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Error Creating Token: %s"); err != nil {
+			panic(err)
+		}
+		return
+	}
+	err = CreateSession(newUser.Id, token)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		if err := json.NewEncoder(w).Encode("Error Creating Session: %s"); err != nil {
+			panic(err)
+		}
+		return
+	}
+	response := RegisterResponse{
+		UserId: newUser.Id,
+		Token:  token,
+		Actor:  newActor.Id,
+	}
+	w.WriteHeader(http.StatusOK)
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		panic(err)
+	}
+}

entities/user/userDatabaseConnector.go

@@ -0,0 +1,132 @@
+package user
+
+import (
+	"fmt"
+
+	"git.nutfactory.org/hoernschen/ActivityPub/utils/database"
+)
+
+func CreateUser(user *User) (err error) {
+	sqlStmt := fmt.Sprintf(`INSERT INTO user
+		(id, password, actor)
+		VALUES
+		(?, ?, ?)`)
+
+	tx, err := database.DB.Begin()
+	if err != nil {
+		return
+	}
+
+	stmt, err := tx.Prepare(sqlStmt)
+	if err != nil {
+		return
+	}
+	defer stmt.Close()
+
+	_, err = stmt.Exec(user.Id, user.Password, user.Actor)
+	if err != nil {
+		tx.Rollback()
+		return
+	}
+	tx.Commit()
+	return
+}
+
+func CreateSession(userId string, token string) (err error) {
+	sqlStmt := fmt.Sprintf(`INSERT INTO session
+		(token, userId)
+		VALUES
+		(?, ?)`)
+
+	tx, err := database.DB.Begin()
+	if err != nil {
+		return
+	}
+
+	stmt, err := tx.Prepare(sqlStmt)
+	if err != nil {
+		return
+	}
+	defer stmt.Close()
+
+	_, err = stmt.Exec(token, userId)
+	if err != nil {
+		tx.Rollback()
+		return
+	}
+	tx.Commit()
+	return
+}
+
+func ReadUser(id string) (foundUser *User, err error) {
+	queryStmt := fmt.Sprintf(`SELECT id, password, actor
+		FROM user
+		WHERE id = '%s'`, id)
+
+	rows, err := database.DB.Query(queryStmt)
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	if rows.Next() {
+		foundUser = &User{}
+		err = rows.Scan(&foundUser.Id, &foundUser.Password, &foundUser.Actor)
+		if err != nil {
+			return
+		}
+		foundUser.Sessions, err = ReadSessionsForUser(foundUser.Id)
+	}
+
+	return
+}
+
+func ReadUserFromToken(token string) (foundUser *User, err error) {
+	queryStmt := fmt.Sprintf(`SELECT u.id, u.password, u.actor
+		FROM user as u
+		join session as s on u.id = s.userId
+		WHERE s.token = '%s'`, token)
+
+	rows, err := database.DB.Query(queryStmt)
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	if rows.Next() {
+		foundUser = &User{}
+		err = rows.Scan(&foundUser.Id, &foundUser.Password, &foundUser.Actor)
+		if err != nil {
+			return
+		}
+		foundUser.Sessions, err = ReadSessionsForUser(foundUser.Id)
+	}
+
+	return
+}
+
+func ReadSessionsForUser(userId string) (sessions []string, err error) {
+	queryStmt := fmt.Sprintf(`SELECT token
+		FROM session
+		WHERE userId = '%s'`, userId)
+
+	rows, err := database.DB.Query(queryStmt)
+	if err != nil {
+		return
+	}
+
+	defer rows.Close()
+
+	for rows.Next() {
+		var session string
+		err = rows.Scan(&session)
+		if err != nil {
+			return
+		}
+		sessions = append(sessions, session)
+	}
+
+	return
+}