Implement deletion of users

api/user.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"errors"
+	"log"
 	"net/http"
 
 	"github.com/eikendev/pushbits/model"
@@ -12,12 +13,21 @@ import (
 // The UserDatabase interface for encapsulating database access.
 type UserDatabase interface {
 	CreateUser(user *model.User) error
+	DeleteUser(user *model.User) error
+	GetUserByID(ID uint) (*model.User, error)
 	GetUserByName(name string) (*model.User, error)
+	GetApplications(user *model.User) ([]model.Application, error)
+}
+
+// The UserDispatcher interface for relaying notifications.
+type UserDispatcher interface {
+	DeregisterApplication(a *model.Application) error
 }
 
 // UserHandler holds information for processing requests about users.
 type UserHandler struct {
-	DB UserDatabase
+	DB         UserDatabase
+	Dispatcher ApplicationDispatcher
 }
 
 func (h *UserHandler) userExists(name string) bool {
@@ -46,3 +56,36 @@ func (h *UserHandler) CreateUser(ctx *gin.Context) {
 
 	ctx.JSON(http.StatusOK, user.IntoExternalUser())
 }
+
+// DeleteUser deletes a user with a certain ID.
+func (h *UserHandler) DeleteUser(ctx *gin.Context) {
+	var deleteUser model.DeleteUser
+
+	if success := successOrAbort(ctx, http.StatusBadRequest, ctx.BindUri(&deleteUser)); !success {
+		return
+	}
+
+	user, err := h.DB.GetUserByID(deleteUser.ID)
+	if success := successOrAbort(ctx, http.StatusBadRequest, err); !success {
+		return
+	}
+
+	log.Printf("Deleting user %s.\n", user.Name)
+
+	applications, err := h.DB.GetApplications(user)
+	if success := successOrAbort(ctx, http.StatusInternalServerError, err); !success {
+		return
+	}
+
+	for _, app := range applications {
+		if success := successOrAbort(ctx, http.StatusInternalServerError, h.Dispatcher.DeregisterApplication(&app)); !success {
+			return
+		}
+	}
+
+	if success := successOrAbort(ctx, http.StatusInternalServerError, h.DB.DeleteUser(user)); !success {
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{})
+}