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usergrp.go
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usergrp.go
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// Package usergrp maintains the group of handlers for user access.
package usergrp
import (
"context"
"errors"
"fmt"
"net/http"
"strconv"
"github.com/kevguy/algosearch/backend/business/core/user"
"github.com/kevguy/algosearch/backend/business/sys/auth"
v1Web "github.com/kevguy/algosearch/backend/business/web/v1"
"github.com/kevguy/algosearch/backend/foundation/web"
)
// Handlers manages the set of user enpoints.
type Handlers struct {
User user.Core
Auth *auth.Auth
}
// Create adds a new user to the system.
func (h Handlers) Create(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
v, err := web.GetValues(ctx)
if err != nil {
return web.NewShutdownError("web value missing from context")
}
var nu user.NewUser
if err := web.Decode(r, &nu); err != nil {
return fmt.Errorf("unable to decode payload: %w", err)
}
usr, err := h.User.Create(ctx, nu, v.Now)
if err != nil {
return fmt.Errorf("user[%+v]: %w", &usr, err)
}
return web.Respond(ctx, w, usr, http.StatusCreated)
}
// Update updates a user in the system.
func (h Handlers) Update(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
v, err := web.GetValues(ctx)
if err != nil {
return web.NewShutdownError("web value missing from context")
}
claims, err := auth.GetClaims(ctx)
if err != nil {
return v1Web.NewRequestError(auth.ErrForbidden, http.StatusForbidden)
}
var upd user.UpdateUser
if err := web.Decode(r, &upd); err != nil {
return fmt.Errorf("unable to decode payload: %w", err)
}
userID := web.Param(r, "id")
// If you are not an admin and looking to retrieve someone other than yourself.
if !claims.Authorized(auth.RoleAdmin) && claims.Subject != userID {
return v1Web.NewRequestError(auth.ErrForbidden, http.StatusForbidden)
}
if err := h.User.Update(ctx, userID, upd, v.Now); err != nil {
switch {
case errors.Is(err, user.ErrInvalidID):
return v1Web.NewRequestError(err, http.StatusBadRequest)
case errors.Is(err, user.ErrNotFound):
return v1Web.NewRequestError(err, http.StatusNotFound)
default:
return fmt.Errorf("ID[%s] User[%+v]: %w", userID, &upd, err)
}
}
return web.Respond(ctx, w, nil, http.StatusNoContent)
}
// Delete removes a user from the system.
func (h Handlers) Delete(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
claims, err := auth.GetClaims(ctx)
if err != nil {
return v1Web.NewRequestError(auth.ErrForbidden, http.StatusForbidden)
}
userID := web.Param(r, "id")
// If you are not an admin and looking to delete someone other than yourself.
if !claims.Authorized(auth.RoleAdmin) && claims.Subject != userID {
return v1Web.NewRequestError(auth.ErrForbidden, http.StatusForbidden)
}
if err := h.User.Delete(ctx, userID); err != nil {
switch {
case errors.Is(err, user.ErrInvalidID):
return v1Web.NewRequestError(err, http.StatusBadRequest)
default:
return fmt.Errorf("ID[%s]: %w", userID, err)
}
}
return web.Respond(ctx, w, nil, http.StatusNoContent)
}
// Query returns a list of users with paging.
func (h Handlers) Query(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
page := web.Param(r, "page")
pageNumber, err := strconv.Atoi(page)
if err != nil {
return v1Web.NewRequestError(fmt.Errorf("invalid page format [%s]", page), http.StatusBadRequest)
}
rows := web.Param(r, "rows")
rowsPerPage, err := strconv.Atoi(rows)
if err != nil {
return v1Web.NewRequestError(fmt.Errorf("invalid rows format [%s]", rows), http.StatusBadRequest)
}
users, err := h.User.Query(ctx, pageNumber, rowsPerPage)
if err != nil {
return fmt.Errorf("unable to query for users: %w", err)
}
return web.Respond(ctx, w, users, http.StatusOK)
}
// QueryByID returns a user by its ID.
func (h Handlers) QueryByID(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
claims, err := auth.GetClaims(ctx)
if err != nil {
return v1Web.NewRequestError(auth.ErrForbidden, http.StatusForbidden)
}
userID := web.Param(r, "id")
// If you are not an admin and looking to retrieve someone other than yourself.
if !claims.Authorized(auth.RoleAdmin) && claims.Subject != userID {
return v1Web.NewRequestError(auth.ErrForbidden, http.StatusForbidden)
}
usr, err := h.User.QueryByID(ctx, userID)
if err != nil {
switch {
case errors.Is(err, user.ErrInvalidID):
return v1Web.NewRequestError(err, http.StatusBadRequest)
case errors.Is(err, user.ErrNotFound):
return v1Web.NewRequestError(err, http.StatusNotFound)
default:
return fmt.Errorf("ID[%s]: %w", userID, err)
}
}
return web.Respond(ctx, w, usr, http.StatusOK)
}
// Token provides an API token for the authenticated user.
func (h Handlers) Token(ctx context.Context, w http.ResponseWriter, r *http.Request) error {
v, err := web.GetValues(ctx)
if err != nil {
return web.NewShutdownError("web value missing from context")
}
email, pass, ok := r.BasicAuth()
if !ok {
err := errors.New("must provide email and password in Basic auth")
return v1Web.NewRequestError(err, http.StatusUnauthorized)
}
claims, err := h.User.Authenticate(ctx, v.Now, email, pass)
if err != nil {
switch {
case errors.Is(err, user.ErrNotFound):
return v1Web.NewRequestError(err, http.StatusNotFound)
case errors.Is(err, user.ErrAuthenticationFailure):
return v1Web.NewRequestError(err, http.StatusUnauthorized)
default:
return fmt.Errorf("authenticating: %w", err)
}
}
var tkn struct {
Token string `json:"token"`
}
tkn.Token, err = h.Auth.GenerateToken(claims)
if err != nil {
return fmt.Errorf("generating token: %w", err)
}
return web.Respond(ctx, w, tkn, http.StatusOK)
}