chrly/http/api.go

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package http
import (
"errors"
"fmt"
"net/http"
"regexp"
"strconv"
"github.com/gorilla/mux"
"github.com/thedevsaddam/govalidator"
"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 Api struct {
Emitter
SkinsRepo SkinsRepository
}
func (ctx *Api) Handler() *mux.Router {
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/skins", ctx.postSkinHandler).Methods(http.MethodPost)
router.HandleFunc("/skins/id:{id:[0-9]+}", ctx.deleteSkinByUserIdHandler).Methods(http.MethodDelete)
router.HandleFunc("/skins/{username}", ctx.deleteSkinByUsernameHandler).Methods(http.MethodDelete)
return router
}
func (ctx *Api) postSkinHandler(resp http.ResponseWriter, req *http.Request) {
validationErrors := validatePostSkinRequest(req)
if validationErrors != nil {
apiBadRequest(resp, validationErrors)
return
}
identityId, _ := strconv.Atoi(req.Form.Get("identityId"))
username := req.Form.Get("username")
record, err := ctx.findIdentityOrCleanup(identityId, username)
if err != nil {
ctx.Emit("skinsystem:error", fmt.Errorf("error on requesting a skin from the repository: %w", err))
apiServerError(resp)
return
}
if record == nil {
record = &model.Skin{
UserId: identityId,
Username: username,
}
}
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.SaveSkin(record)
if err != nil {
ctx.Emit("skinsystem:error", fmt.Errorf("unable to save record to the repository: %w", err))
apiServerError(resp)
return
}
resp.WriteHeader(http.StatusCreated)
}
func (ctx *Api) deleteSkinByUserIdHandler(resp http.ResponseWriter, req *http.Request) {
id, _ := strconv.Atoi(mux.Vars(req)["id"])
skin, err := ctx.SkinsRepo.FindSkinByUserId(id)
ctx.deleteSkin(skin, err, resp)
}
func (ctx *Api) deleteSkinByUsernameHandler(resp http.ResponseWriter, req *http.Request) {
username := mux.Vars(req)["username"]
skin, err := ctx.SkinsRepo.FindSkinByUsername(username)
ctx.deleteSkin(skin, err, resp)
}
func (ctx *Api) deleteSkin(skin *model.Skin, err error, resp http.ResponseWriter) {
if err != nil {
ctx.Emit("skinsystem:error", fmt.Errorf("unable to find skin info from the repository: %w", err))
apiServerError(resp)
return
}
if skin == nil {
apiNotFound(resp, "Cannot find record for the requested identifier")
return
}
err = ctx.SkinsRepo.RemoveSkinByUserId(skin.UserId)
if err != nil {
ctx.Emit("skinsystem:error", fmt.Errorf("cannot delete skin by error: %w", err))
apiServerError(resp)
return
}
resp.WriteHeader(http.StatusNoContent)
}
func (ctx *Api) findIdentityOrCleanup(identityId int, username string) (*model.Skin, error) {
record, err := ctx.SkinsRepo.FindSkinByUserId(identityId)
if err != nil {
return nil, err
}
if record != nil {
// The username may have changed in the external database,
// so we need to remove the old association
if record.Username != username {
_ = ctx.SkinsRepo.RemoveSkinByUserId(identityId)
record.Username = username
}
return record, nil
}
// If the requested id was not found, then username was reassigned to another user
// who has not uploaded his data to Chrly yet
record, err = ctx.SkinsRepo.FindSkinByUsername(username)
if err != nil {
return nil, err
}
// If the target username does exist, clear it as it will be reassigned to the new user
if record != nil {
_ = ctx.SkinsRepo.RemoveSkinByUsername(username)
record.UserId = identityId
return record, nil
}
return nil, nil
}
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
}