func main() {
dbHost := flag.String("dbhost", "localhost", "the database host")
dbPort := flag.Int("dbport", 5432, "the database port")
dbUser := flag.String("dbuser", "aclapp", "the database user")
dbSsl := flag.Bool("dbssl", false, "database ssl config")
dbName := flag.String("dbname", "acl", "the database name")
dbPassword := flag.String("dbpass", "", "database password")
flag.Parse()
config := pgmapper.DefaultConfig()
config.Host = *dbHost
config.Port = *dbPort
config.User = *dbUser
config.Ssl = *dbSsl
config.Database = *dbName
config.Password = *dbPassword
r := mux.NewRouter()
mapper, err := pgmapper.New(config)
if err != nil {
log.Fatal(err)
}
objectIdExtractor := idextractor.MuxIdExtractor("objectId")
userIdExtractor := idextractor.MuxIdExtractor("userId")
r.Methods("POST").Path("/objects").Handler(jwtware.New(addObjectHandler(mapper)))
r.Methods("DELETE").Path("/objects/{objectId}").Handler(jwtware.New(deleteObjectHandler(mapper, objectIdExtractor)))
r.Methods("GET").Path("/objects/{objectId}/permissions/{userId}").Handler(jwtware.New(getPermissionsHandler(mapper, objectIdExtractor, userIdExtractor)))
r.Methods("PUT").Path("/objects/{objectId}/permissions").Handler(jwtware.New(upsertPermissionsHandler(mapper, objectIdExtractor)))
r.Methods("PUT").Path("/sids/{sid}/permissions").Handler(jwtware.New(upsertMultiplePermissionsHandler(mapper, idextractor.MuxIdExtractor("sid"))))
log.Println("listening on 8080")
http.ListenAndServe(":8080", r)
}
func PurchaseHintHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
return http.StatusBadRequest
}
userId := context.Get(r, "user").(*jwt.Token).Claims["id"].(string)
result, err := mapper.PreparedQueryIntoBytes("SELECT purchase_hint(%v)", id, userId)
if err != nil {
log.Println(err)
return http.StatusInternalServerError
}
purchaseResult, _ := strconv.Atoi(string(result))
log.Println("hint purchase achieved the following result: ", purchaseResult)
switch {
case purchaseResult == 0:
//hint purchase without errors
return -1
case purchaseResult == 1:
//balance not sufficient
return 420
case purchaseResult == 2:
//already purchased
return http.StatusConflict
case purchaseResult == 3:
//hint not found
return http.StatusNotFound
default:
//something different went wrong
return http.StatusInternalServerError
}
}
return jwtware.New(createHandler(handlerFunc))
}
func ModulesPatchHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
return http.StatusInternalServerError
}
log.Println("got patch request for module")
patch, err := jsonpatch.Decode(r.Body)
if err != nil {
log.Println("error while decoding json: ", err)
return http.StatusBadRequest
}
userId := context.Get(r, "user").(*jwt.Token).Claims["id"].(string)
options := map[string]interface{}{
"userId": userId,
"id": id,
"jwt": r.Header.Get("Authorization"),
}
compiler := lecturepatch.ForModules()
err = mapper.ApplyPatch(patch, compiler, options)
if err != nil {
if err == lecturepatch.PermissionDeniedError {
log.Println(err)
return http.StatusUnauthorized
} else {
log.Println("error while applying module patch: ", err)
return http.StatusBadRequest
}
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func ModulesTreeHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
log.Println("error with extractor in ModulesTreeHandler")
return http.StatusBadRequest
}
dr, err := paginator.ParseDepth(r.URL)
if err != nil {
log.Println("error parsing depth request in ModulesTreeHandler")
return http.StatusInternalServerError
}
result, err := mapper.PreparedQueryIntoBytes("SELECT get_module_tree(%v)", id, dr.Descendants, dr.Ancestors)
if err != nil {
log.Println(err)
return http.StatusInternalServerError
}
reader := bytes.NewReader(result)
_, err = io.Copy(w, reader)
if err != nil {
log.Println(err)
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func ExerciseHistoryHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
pr, err := paginator.ParsePages(r.URL)
if err != nil {
return http.StatusInternalServerError
}
id, err := extractor(r)
if err != nil {
return http.StatusInternalServerError
}
limit := pr.Size
skip := pr.Size * pr.Number
if pr.Number == -1 || pr.Size == -1 {
skip = -1
}
var result []byte
if ids, ok := r.URL.Query()["module_id"]; ok {
result, err = mapper.PreparedQueryIntoBytes("SELECT get_exercise_history(%v)", id, limit, skip, ids[0])
} else {
result, err = mapper.PreparedQueryIntoBytes("SELECT get_exercise_history(%v)", id, limit, skip)
}
if err != nil {
return http.StatusNotFound
}
reader := bytes.NewReader(result)
_, err = io.Copy(w, reader)
if err != nil {
log.Println(err)
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func TopicCreateHandler(mapper *pgmapper.Mapper) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
var topic = make(map[string]interface{})
err := json.NewDecoder(r.Body).Decode(&topic)
if err != nil {
log.Println("error while decoding new topic json: ", err)
return http.StatusBadRequest
}
err = mapper.Execute("SELECT add_topic(%v)", topic["id"], topic["name"], topic["description"], topic["officers"])
if err != nil {
log.Println("error while inserting new topic into database")
return http.StatusBadRequest // TODO it could be an internal server error as well. need distinction
}
client := serviceclient.New("acl-service")
aclEntity, _ := json.Marshal(topic)
resp, err := client.Post("/objects", "application/json", bytes.NewReader(aclEntity), "Authorization", r.Header.Get("Authorization"))
if err != nil {
log.Println("error while creating acl-object: ", err)
return http.StatusInternalServerError
}
if resp.StatusCode >= 300 {
log.Println("got unexpected statuscode from acl-service while creating object: ", resp.StatusCode)
return http.StatusInternalServerError
}
return http.StatusCreated
}
return jwtware.New(createHandler(handlerFunc))
}
func buildUploadHandler(host string) http.Handler {
backend := mongofs.New(host, "media", "fs")
uploadHandler := UploadHandler(backend)
return jwtware.New(
groupware.New(groupware.DefaultOptions(
uploadHandler)))
}
func ExerciseStartHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
user := context.Get(r, "user")
id := user.(*jwt.Token).Claims["id"]
exerciseId, err := extractor(r)
if err != nil {
return http.StatusInternalServerError
}
err = mapper.Execute("select start_exercise(%v)", exerciseId, id)
if err != nil {
return http.StatusNotFound
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func TopicBalanceHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
return http.StatusInternalServerError
}
result, err := mapper.PreparedQueryIntoBytes("Select get_balances(%v)", id)
if err != nil {
return http.StatusNotFound
}
reader := bytes.NewReader(result)
_, err = io.Copy(w, reader)
if err != nil {
log.Println(err)
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func TopicRemoveOfficerHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
return http.StatusInternalServerError
}
var officer string
err = json.NewDecoder(r.Body).Decode(officer)
if err != nil {
return http.StatusBadRequest
}
err = mapper.Execute("SELECT remove_officer(%v)", id, officer)
if err != nil {
return http.StatusInternalServerError
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func ModulesGetHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
log.Println("error with extractor in ModulesGetHandler")
return http.StatusInternalServerError
}
result, err := mapper.QueryIntoBytes(`SELECT details from module_details where id = $1`, id)
if err != nil {
return http.StatusNotFound
}
reader := bytes.NewReader(result)
_, err = io.Copy(w, reader)
if err != nil {
log.Println(err)
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func TopicCollectionHandler(mapper *pgmapper.Mapper) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
pageRequest, err := paginator.ParsePages(r.URL)
if err != nil {
return http.StatusInternalServerError
}
result, err := mapper.PreparedQueryIntoBytes("SELECT * from query_topics(%v)", pageRequest.Number*pageRequest.Size, pageRequest.Size)
if err != nil {
log.Println(err)
return http.StatusInternalServerError
}
reader := bytes.NewReader(result)
_, err = io.Copy(w, reader)
if err != nil {
log.Println(err)
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func GetHintHandler(mapper *pgmapper.Mapper, extractor idextractor.Extractor) http.Handler {
handlerFunc := func(w http.ResponseWriter, r *http.Request) int {
id, err := extractor(r)
if err != nil {
return http.StatusBadRequest
}
userId := context.Get(r, "user").(*jwt.Token).Claims["id"].(string)
result, err := mapper.PreparedQueryIntoBytes("SELECT get_hint(%v)", userId, id)
switch {
case err != nil:
return http.StatusInternalServerError
case len(result) == 0:
return http.StatusPaymentRequired
}
reader := bytes.NewReader(result)
_, err = io.Copy(w, reader)
if err != nil {
log.Println(err)
}
return -1
}
return jwtware.New(createHandler(handlerFunc))
}
func jwtWrapper(next http.Handler, auth bool) http.Handler {
if !auth {
return next
}
return jwtware.New(next)
}
func buildDownloadHandler(host string) http.Handler {
backend := mongofs.New(host, "media", "fs")
return jwtware.New(http.FileServer(backend))
}