From bd9f1369a017589976231756ba512e57ced03a79 Mon Sep 17 00:00:00 2001
From: lbenedar <lbenedar@local.lab>
Date: Thu, 19 Mar 2026 17:21:50 +0300
Subject: [PATCH] ch13.3

---
 cmd/api/routes.go      |  2 ++
 cmd/api/users.go       | 59 ++++++++++++++++++++++++++++++++++++++++++
 internal/data/users.go |  6 ++---
 3 files changed, 64 insertions(+), 3 deletions(-)
 create mode 100644 cmd/api/users.go

diff --git a/cmd/api/routes.go b/cmd/api/routes.go
index 28b6270..5410c5e 100644
--- a/cmd/api/routes.go
+++ b/cmd/api/routes.go
@@ -20,5 +20,7 @@ func (app *application) routes() http.Handler {
 	router.HandlerFunc(http.MethodPatch, "/v1/movies/:id", app.updateMovieHandler)
 	router.HandlerFunc(http.MethodDelete, "/v1/movies/:id", app.deleteMovieHandler)
 
+	router.HandlerFunc(http.MethodPost, "/v1/users", app.registerUserHandler)
+
 	return app.recoverPanic(app.rateLimit(router))
 }
diff --git a/cmd/api/users.go b/cmd/api/users.go
new file mode 100644
index 0000000..2fa3992
--- /dev/null
+++ b/cmd/api/users.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"errors"
+	"net/http"
+
+	"gitea.local.lab/Lbenedar/greenlight/internal/data"
+	"gitea.local.lab/Lbenedar/greenlight/internal/validator"
+)
+
+func (app *application) registerUserHandler(w http.ResponseWriter, r *http.Request) {
+	var input struct {
+		Name     string `json:"name"`
+		Email    string `json:"email"`
+		Password string `json:"password"`
+	}
+
+	err := app.readJSON(w, r, &input)
+	if err != nil {
+		app.badRequestResponse(w, r, err)
+		return
+	}
+
+	user := &data.User{
+		Name:      input.Name,
+		Email:     input.Email,
+		Activated: false,
+	}
+
+	err = user.Password.Set(input.Password)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+		return
+	}
+
+	v := validator.New()
+
+	if data.ValidateUser(v, user); !v.Valid() {
+		app.failedValidationResponse(w, r, v.Errors)
+		return
+	}
+
+	err = app.models.Users.Insert(user)
+	if err != nil {
+		switch {
+		case errors.Is(err, data.ErrDuplicateEmail):
+			v.AddError("email", "a user with this email address already exists")
+			app.failedValidationResponse(w, r, v.Errors)
+		default:
+			app.serverErrorResponse(w, r, err)
+		}
+		return
+	}
+
+	err = app.writeJSON(w, http.StatusCreated, envelope{"user": user}, nil)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+	}
+}
diff --git a/internal/data/users.go b/internal/data/users.go
index 7779022..d203e98 100644
--- a/internal/data/users.go
+++ b/internal/data/users.go
@@ -75,7 +75,7 @@ func ValidateUser(v *validator.Validator, user *User) {
 		ValidatePasswordPlaintext(v, *user.Password.plaintext)
 	}
 
-	if user.Password.hash != nil {
+	if user.Password.hash == nil {
 		panic("missing password hash for user")
 	}
 }
@@ -97,7 +97,7 @@ func (m UserModel) Insert(user *User) error {
 	err := m.DB.QueryRowContext(ctx, query, args...).Scan(&user.ID, &user.CreatedAt, &user.Version)
 	if err != nil {
 		switch {
-		case err.Error() == `pq: duplicate key value violates unique constraint "users_email_key"`:
+		case err.Error() == `pq: duplicate key value violates unique constraint "users_email_key" (23505)`:
 			return ErrDuplicateEmail
 		default:
 			return err
@@ -161,7 +161,7 @@ func (m UserModel) Update(user *User) error {
 	err := m.DB.QueryRowContext(ctx, query, args...).Scan(&user.Version)
 	if err != nil {
 		switch {
-		case err.Error() == `pq: duplicate key value violates unique constraint "users_email_key"`:
+		case err.Error() == `pq: duplicate key value violates unique constraint "users_email_key" (23505)`:
 			return ErrDuplicateEmail
 		default:
 			return err