chrly/http/skinsystem.go

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package http
import (
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"regexp"
"strconv"
"strings"
"time"
"github.com/gorilla/mux"
"github.com/mono83/slf/wd"
"github.com/thedevsaddam/govalidator"
"github.com/elyby/chrly/api/mojang"
"github.com/elyby/chrly/auth"
"github.com/elyby/chrly/model"
)
//noinspection GoSnakeCaseUsage
const UUID_ANY = "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
var regexUuidAny = regexp.MustCompile(UUID_ANY)
func init() {
govalidator.AddCustomRule("skinUploadingNotAvailable", func(field string, rule string, message string, value interface{}) error {
if message == "" {
message = "Skin uploading is temporary unavailable"
}
return errors.New(message)
})
// Add ability to validate any possible uuid form
govalidator.AddCustomRule("uuid_any", func(field string, rule string, message string, value interface{}) error {
str := value.(string)
if !regexUuidAny.MatchString(str) {
if message == "" {
message = fmt.Sprintf("The %s field must contain valid UUID", field)
}
return errors.New(message)
}
return nil
})
}
type SkinsRepository interface {
FindByUsername(username string) (*model.Skin, error)
FindByUserId(id int) (*model.Skin, error)
Save(skin *model.Skin) error
RemoveByUserId(id int) error
RemoveByUsername(username string) error
}
type CapesRepository interface {
FindByUsername(username string) (*model.Cape, error)
}
type SkinNotFoundError struct {
Who string
}
func (e SkinNotFoundError) Error() string {
return "Skin data not found."
}
type CapeNotFoundError struct {
Who string
}
func (e CapeNotFoundError) Error() string {
return "Cape file not found."
}
type MojangTexturesProvider interface {
GetForUsername(username string) (*mojang.SignedTexturesResponse, error)
}
type AuthChecker interface {
Check(req *http.Request) error
}
type Skinsystem struct {
ListenSpec string
SkinsRepo SkinsRepository
CapesRepo CapesRepository
MojangTexturesProvider MojangTexturesProvider
Auth AuthChecker
Logger wd.Watchdog
}
func (ctx *Skinsystem) Run() error {
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ctx.Logger.Info(fmt.Sprintf("Starting the app, HTTP on: %s\n", ctx.ListenSpec))
listener, err := net.Listen("tcp", ctx.ListenSpec)
if err != nil {
return err
}
server := &http.Server{
ReadTimeout: 60 * time.Second,
WriteTimeout: 60 * time.Second,
MaxHeaderBytes: 1 << 16,
Handler: ctx.CreateHandler(),
}
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return server.Serve(listener)
}
func (ctx *Skinsystem) CreateHandler() *mux.Router {
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/skins/{username}", ctx.Skin).Methods("GET")
router.HandleFunc("/cloaks/{username}", ctx.Cape).Methods("GET").Name("cloaks")
router.HandleFunc("/textures/{username}", ctx.Textures).Methods("GET")
router.HandleFunc("/textures/signed/{username}", ctx.SignedTextures).Methods("GET")
// Legacy
router.HandleFunc("/skins", ctx.SkinGET).Methods("GET")
router.HandleFunc("/cloaks", ctx.CapeGET).Methods("GET")
// API
apiRouter := router.PathPrefix("/api").Subrouter()
apiRouter.Use(ctx.AuthenticationMiddleware)
apiRouter.Handle("/skins", http.HandlerFunc(ctx.PostSkin)).Methods("POST")
apiRouter.Handle("/skins/id:{id:[0-9]+}", http.HandlerFunc(ctx.DeleteSkinByUserId)).Methods("DELETE")
apiRouter.Handle("/skins/{username}", http.HandlerFunc(ctx.DeleteSkinByUsername)).Methods("DELETE")
// 404
router.NotFoundHandler = http.HandlerFunc(NotFound)
return router
}
func (ctx *Skinsystem) Skin(response http.ResponseWriter, request *http.Request) {
if mux.Vars(request)["converted"] == "" {
ctx.Logger.IncCounter("skins.request", 1)
}
username := parseUsername(mux.Vars(request)["username"])
rec, err := ctx.SkinsRepo.FindByUsername(username)
if err == nil && rec.SkinId != 0 {
http.Redirect(response, request, rec.Url, 301)
return
}
mojangTextures, err := ctx.MojangTexturesProvider.GetForUsername(username)
if err != nil || mojangTextures == nil {
response.WriteHeader(http.StatusNotFound)
return
}
texturesProp := mojangTextures.DecodeTextures()
skin := texturesProp.Textures.Skin
if skin == nil {
response.WriteHeader(http.StatusNotFound)
return
}
http.Redirect(response, request, skin.Url, 301)
}
func (ctx *Skinsystem) SkinGET(response http.ResponseWriter, request *http.Request) {
username := request.URL.Query().Get("name")
if username == "" {
response.WriteHeader(http.StatusBadRequest)
return
}
ctx.Logger.IncCounter("skins.get_request", 1)
mux.Vars(request)["username"] = username
mux.Vars(request)["converted"] = "1"
ctx.Skin(response, request)
}
func (ctx *Skinsystem) Cape(response http.ResponseWriter, request *http.Request) {
if mux.Vars(request)["converted"] == "" {
ctx.Logger.IncCounter("capes.request", 1)
}
username := parseUsername(mux.Vars(request)["username"])
rec, err := ctx.CapesRepo.FindByUsername(username)
if err == nil {
request.Header.Set("Content-Type", "image/png")
_, _ = io.Copy(response, rec.File)
return
}
mojangTextures, err := ctx.MojangTexturesProvider.GetForUsername(username)
if err != nil || mojangTextures == nil {
response.WriteHeader(http.StatusNotFound)
return
}
texturesProp := mojangTextures.DecodeTextures()
cape := texturesProp.Textures.Cape
if cape == nil {
response.WriteHeader(http.StatusNotFound)
return
}
http.Redirect(response, request, cape.Url, 301)
}
func (ctx *Skinsystem) CapeGET(response http.ResponseWriter, request *http.Request) {
username := request.URL.Query().Get("name")
if username == "" {
response.WriteHeader(http.StatusBadRequest)
return
}
ctx.Logger.IncCounter("capes.get_request", 1)
mux.Vars(request)["username"] = username
mux.Vars(request)["converted"] = "1"
ctx.Cape(response, request)
}
func (ctx *Skinsystem) Textures(response http.ResponseWriter, request *http.Request) {
ctx.Logger.IncCounter("textures.request", 1)
username := parseUsername(mux.Vars(request)["username"])
var textures *mojang.TexturesResponse
skin, skinErr := ctx.SkinsRepo.FindByUsername(username)
_, capeErr := ctx.CapesRepo.FindByUsername(username)
if (skinErr == nil && skin.SkinId != 0) || capeErr == nil {
textures = &mojang.TexturesResponse{}
if skinErr == nil && skin.SkinId != 0 {
skinTextures := &mojang.SkinTexturesResponse{
Url: skin.Url,
}
if skin.IsSlim {
skinTextures.Metadata = &mojang.SkinTexturesMetadata{
Model: "slim",
}
}
textures.Skin = skinTextures
}
if capeErr == nil {
textures.Cape = &mojang.CapeTexturesResponse{
Url: request.URL.Scheme + "://" + request.Host + "/cloaks/" + username,
}
}
} else {
mojangTextures, err := ctx.MojangTexturesProvider.GetForUsername(username)
if err != nil || mojangTextures == nil {
response.WriteHeader(http.StatusNoContent)
return
}
texturesProp := mojangTextures.DecodeTextures()
if texturesProp == nil {
response.WriteHeader(http.StatusInternalServerError)
ctx.Logger.Error("Unable to find textures property")
return
}
textures = texturesProp.Textures
}
responseData, _ := json.Marshal(textures)
response.Header().Set("Content-Type", "application/json")
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_, _ = response.Write(responseData)
}
func (ctx *Skinsystem) SignedTextures(response http.ResponseWriter, request *http.Request) {
ctx.Logger.IncCounter("signed_textures.request", 1)
username := parseUsername(mux.Vars(request)["username"])
var responseData *mojang.SignedTexturesResponse
rec, err := ctx.SkinsRepo.FindByUsername(username)
if err == nil && rec.SkinId != 0 && rec.MojangTextures != "" {
responseData = &mojang.SignedTexturesResponse{
Id: strings.Replace(rec.Uuid, "-", "", -1),
Name: rec.Username,
Props: []*mojang.Property{
{
Name: "textures",
Signature: rec.MojangSignature,
Value: rec.MojangTextures,
},
},
}
} else if request.URL.Query().Get("proxy") != "" {
mojangTextures, err := ctx.MojangTexturesProvider.GetForUsername(username)
if err == nil && mojangTextures != nil {
responseData = mojangTextures
}
}
if responseData == nil {
response.WriteHeader(http.StatusNoContent)
return
}
responseData.Props = append(responseData.Props, &mojang.Property{
Name: "chrly",
Value: "how do you tame a horse in Minecraft?",
})
responseJson, _ := json.Marshal(responseData)
response.Header().Set("Content-Type", "application/json")
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_, _ = response.Write(responseJson)
}
func (ctx *Skinsystem) PostSkin(resp http.ResponseWriter, req *http.Request) {
ctx.Logger.IncCounter("api.skins.post.request", 1)
validationErrors := validatePostSkinRequest(req)
if validationErrors != nil {
ctx.Logger.IncCounter("api.skins.post.validation_failed", 1)
apiBadRequest(resp, validationErrors)
return
}
identityId, _ := strconv.Atoi(req.Form.Get("identityId"))
username := req.Form.Get("username")
record, err := findIdentity(ctx.SkinsRepo, identityId, username)
if err != nil {
ctx.Logger.Error("Error on requesting a skin from the repository: :err", wd.ErrParam(err))
apiServerError(resp)
return
}
skinId, _ := strconv.Atoi(req.Form.Get("skinId"))
is18, _ := strconv.ParseBool(req.Form.Get("is1_8"))
isSlim, _ := strconv.ParseBool(req.Form.Get("isSlim"))
record.Uuid = req.Form.Get("uuid")
record.SkinId = skinId
record.Is1_8 = is18
record.IsSlim = isSlim
record.Url = req.Form.Get("url")
record.MojangTextures = req.Form.Get("mojangTextures")
record.MojangSignature = req.Form.Get("mojangSignature")
err = ctx.SkinsRepo.Save(record)
if err != nil {
ctx.Logger.Error("Unable to save record to the repository: :err", wd.ErrParam(err))
apiServerError(resp)
return
}
ctx.Logger.IncCounter("api.skins.post.success", 1)
resp.WriteHeader(http.StatusCreated)
}
func (ctx *Skinsystem) DeleteSkinByUserId(resp http.ResponseWriter, req *http.Request) {
ctx.Logger.IncCounter("api.skins.delete.request", 1)
id, _ := strconv.Atoi(mux.Vars(req)["id"])
skin, err := ctx.SkinsRepo.FindByUserId(id)
if err != nil {
ctx.Logger.IncCounter("api.skins.delete.not_found", 1)
apiNotFound(resp, "Cannot find record for requested user id")
return
}
ctx.deleteSkin(skin, resp)
}
func (ctx *Skinsystem) DeleteSkinByUsername(resp http.ResponseWriter, req *http.Request) {
ctx.Logger.IncCounter("api.skins.delete.request", 1)
username := mux.Vars(req)["username"]
skin, err := ctx.SkinsRepo.FindByUsername(username)
if err != nil {
ctx.Logger.IncCounter("api.skins.delete.not_found", 1)
apiNotFound(resp, "Cannot find record for requested username")
return
}
ctx.deleteSkin(skin, resp)
}
func (ctx *Skinsystem) AuthenticationMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
ctx.Logger.IncCounter("authentication.challenge", 1)
err := ctx.Auth.Check(req)
if err != nil {
if _, ok := err.(*auth.Unauthorized); ok {
ctx.Logger.IncCounter("authentication.failed", 1)
apiForbidden(resp, err.Error())
} else {
ctx.Logger.Error("Unknown error on validating api request: :err", wd.ErrParam(err))
apiServerError(resp)
}
return
}
ctx.Logger.IncCounter("authentication.success", 1)
handler.ServeHTTP(resp, req)
})
}
func (ctx *Skinsystem) deleteSkin(skin *model.Skin, resp http.ResponseWriter) {
err := ctx.SkinsRepo.RemoveByUserId(skin.UserId)
if err != nil {
ctx.Logger.Error("Cannot delete skin by error: :err", wd.ErrParam(err))
apiServerError(resp)
return
}
ctx.Logger.IncCounter("api.skins.delete.success", 1)
resp.WriteHeader(http.StatusNoContent)
}
func validatePostSkinRequest(request *http.Request) map[string][]string {
const maxMultipartMemory int64 = 32 << 20
const oneOfSkinOrUrlMessage = "One of url or skin should be provided, but not both"
_ = request.ParseMultipartForm(maxMultipartMemory)
validationRules := govalidator.MapData{
"identityId": {"required", "numeric", "min:1"},
"username": {"required"},
"uuid": {"required", "uuid_any"},
"skinId": {"required", "numeric", "min:1"},
"url": {"url"},
"file:skin": {"ext:png", "size:24576", "mime:image/png"},
"is1_8": {"bool"},
"isSlim": {"bool"},
}
shouldAppendSkinRequiredError := false
url := request.Form.Get("url")
_, _, skinErr := request.FormFile("skin")
if (url != "" && skinErr == nil) || (url == "" && skinErr != nil) {
shouldAppendSkinRequiredError = true
} else if skinErr == nil {
validationRules["file:skin"] = append(validationRules["file:skin"], "skinUploadingNotAvailable")
} else if url != "" {
validationRules["is1_8"] = append(validationRules["is1_8"], "required")
validationRules["isSlim"] = append(validationRules["isSlim"], "required")
}
mojangTextures := request.Form.Get("mojangTextures")
if mojangTextures != "" {
validationRules["mojangSignature"] = []string{"required"}
}
validator := govalidator.New(govalidator.Options{
Request: request,
Rules: validationRules,
RequiredDefault: false,
FormSize: maxMultipartMemory,
})
validationResults := validator.Validate()
if shouldAppendSkinRequiredError {
validationResults["url"] = append(validationResults["url"], oneOfSkinOrUrlMessage)
validationResults["skin"] = append(validationResults["skin"], oneOfSkinOrUrlMessage)
}
if len(validationResults) != 0 {
return validationResults
}
return nil
}
func findIdentity(repo SkinsRepository, identityId int, username string) (*model.Skin, error) {
var record *model.Skin
record, err := repo.FindByUserId(identityId)
if err != nil {
if _, isSkinNotFound := err.(*SkinNotFoundError); !isSkinNotFound {
return nil, err
}
record, err = repo.FindByUsername(username)
if err == nil {
_ = repo.RemoveByUsername(username)
record.UserId = identityId
} else {
record = &model.Skin{
UserId: identityId,
Username: username,
}
}
} else if record.Username != username {
_ = repo.RemoveByUserId(identityId)
record.Username = username
}
return record, nil
}
func parseUsername(username string) string {
return strings.TrimSuffix(username, ".png")
}