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main.go
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main.go
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package main
import (
"crypto/md5"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"flag"
"net/http"
"strings"
"time"
"github.com/antonholmquist/jason"
"github.com/gorilla/context"
"github.com/gorilla/mux"
"github.com/nu7hatch/gouuid"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/util"
)
const (
KeySeperator = "_"
KeyPrefixUser = "user"
KeyPrefixRecord = "record"
KeyPrefixToken = "token"
KeyPrefixWhiteList = "whitelist"
)
type User struct {
Username string `json:"username"`
Pwd string `json:"password"`
Token string `json:"token"`
}
type Record struct {
Word string `json:"word"`
Phonetic string `json:"phonetic"`
Explain string `json:"explain"`
Username string `json:"username"`
CreateAt time.Time `json:"create_at"`
}
var dbPath = flag.String("db", "./.wordbook.db", "db path")
var addr = flag.String("addr", ":8088", "addr")
// global db
var db *leveldb.DB
func buildKey(args ...string) []byte {
return []byte(strings.Join(args, KeySeperator))
}
func md5Hash(text string) string {
hasher := md5.New()
hasher.Write([]byte(text))
return hex.EncodeToString(hasher.Sum(nil))
}
var ErrUserExists = errors.New("username already exists")
func UserExists(username string) (bool, error) {
k := buildKey(KeyPrefixUser, username)
b, err := db.Has(k, nil)
if err != nil {
return false, err
}
return b, nil
}
func GetUserFromName(username string) (*User, error) {
k := buildKey(KeyPrefixUser, username)
b, err := db.Get(k, nil)
if err != nil {
return nil, err
}
var u User
json.Unmarshal(b, &u)
return &u, nil
}
func CheckUserToken(username string, token string) (bool, error) {
u, err := GetUserFromName(username)
if err != nil {
return false, err
}
if u == nil {
return false, nil
}
if u.Token != token {
return false, nil
}
return true, nil
}
func CheckUser(username string, pwd string) (bool, error) {
u, err := GetUserFromName(username)
if err != nil {
return false, err
}
if u.Username == username && u.Pwd == md5Hash(pwd) {
return true, nil
}
return false, nil
}
func GetUserFromToken(token string) (*User, error) {
k := buildKey(KeyPrefixToken, token)
uname, err := db.Get(k, nil)
if err != nil {
return nil, err
}
return GetUserFromName(string(uname))
}
func AddWhiteList(username, word string) error {
k := buildKey(KeyPrefixWhiteList, username, word)
err := db.Put(k, []byte(word), nil)
if err != nil {
return err
}
return nil
}
func IsInWhiteList(username, word string) (bool, error) {
k := buildKey(KeyPrefixWhiteList, username, word)
b, err := db.Has(k, nil)
if err != nil {
return false, err
}
return b, nil
}
func Register(username string, pwd string) (*User, error) {
exists, err := UserExists(username)
if err != nil {
return nil, err
}
if exists {
return nil, ErrUserExists
}
k := buildKey(KeyPrefixUser, username)
u4, _ := uuid.NewV4()
u := &User{
Username: username,
Pwd: md5Hash(pwd),
Token: md5Hash(u4.String()),
}
b, _ := json.Marshal(u)
err = db.Put(k, b, nil)
if err != nil {
return nil, err
}
// update token list
k = buildKey(KeyPrefixToken, u.Token)
err = db.Put(k, []byte(u.Username), nil)
if err != nil {
return nil, err
}
return u, nil
}
func CreateRecord(username string, rec *Record) error {
ok, err := IsInWhiteList(username, rec.Word)
if err != nil {
return err
}
if ok {
return errors.New("already in whitelist")
}
rec.CreateAt = time.Now()
date := rec.CreateAt.Format("20060102")
k := buildKey(KeyPrefixRecord, username, date, rec.Word)
b, _ := json.Marshal(rec)
err = db.Put(k, b, nil)
if err != nil {
return err
}
return nil
}
func iterRecords(keyPrefix []byte) ([]*Record, error) {
records := make([]*Record, 0)
iter := db.NewIterator(util.BytesPrefix(keyPrefix), nil)
for iter.Next() {
var rec Record
b := iter.Value()
err := json.Unmarshal(b, &rec)
if err != nil {
return nil, err
}
records = append(records, &rec)
}
iter.Release()
err := iter.Error()
if err != nil {
return nil, err
}
return records, nil
}
func GetRecordsByDate(username string, dateStr string) ([]*Record, error) {
k := buildKey(KeyPrefixRecord, username, dateStr)
return iterRecords(k)
}
func GetRecords(username string) ([]*Record, error) {
k := buildKey(KeyPrefixRecord, username)
return iterRecords(k)
}
func RemoveRecord(username, dateStr, word string) error {
k := buildKey(KeyPrefixRecord, username, dateStr, word)
return db.Delete(k, nil)
}
/* handlers */
func RegisterHandler(w http.ResponseWriter, r *http.Request) {
form, err := jason.NewObjectFromReader(r.Body)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
username, err := form.GetString("username")
if err != nil {
http.Error(w, err.Error(), 500)
return
}
password, err := form.GetString("password")
if err != nil {
http.Error(w, err.Error(), 500)
return
}
u, err := Register(username, password)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
b, _ := json.Marshal(map[string]interface{}{
"token": u.Token,
})
w.Write(b)
}
func GetTokenFromHeader(r *http.Request) string {
_, ok := r.Header["Authorization"]
if !ok {
return ""
}
auth := strings.SplitN(r.Header["Authorization"][0], " ", 2)
if len(auth) != 2 {
return ""
}
method, payload := auth[0], auth[1]
if method != "Token" {
return ""
}
return payload
}
func AuthFilter(w http.ResponseWriter, r *http.Request) bool {
_, ok := r.Header["Authorization"]
if !ok {
http.Error(w, "Need Authorization Header", http.StatusBadRequest)
return false
}
auth := strings.SplitN(r.Header["Authorization"][0], " ", 2)
if len(auth) != 2 {
http.Error(w, "Bad Syntax", http.StatusBadRequest)
return false
}
method, payload := auth[0], auth[1]
switch method {
case "Basic":
p, _ := base64.StdEncoding.DecodeString(payload)
pair := strings.SplitN(string(p), ":", 2)
if len(pair) != 2 {
break
}
b, err := CheckUser(pair[0], pair[1])
if err != nil {
break
}
if b {
u, err := GetUserFromName(pair[0])
if err != nil {
break
}
context.Set(r, "user", u)
}
return b
case "Token":
u, err := GetUserFromToken(payload)
if err != nil || u == nil {
break
}
context.Set(r, "user", u)
return true
}
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return false
}
func CreateRecordHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
username := vars["username"]
if v := context.Get(r, "user"); v != nil {
if v.(*User).Username != username {
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return
}
}
dec := json.NewDecoder(r.Body)
var rec Record
err := dec.Decode(&rec)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
rec.Username = username
err = CreateRecord(username, &rec)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
b, _ := json.Marshal(rec)
w.Write(b)
}
func GetTokenHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
username := vars["username"]
if v := context.Get(r, "user"); v != nil {
if v.(*User).Username != username {
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return
}
}
k := buildKey(KeyPrefixUser, username)
b, err := db.Get(k, nil)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
var u User
json.Unmarshal(b, &u)
b, _ = json.Marshal(map[string]interface{}{
"token": u.Token,
})
w.Write(b)
}
func GetRecordsHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
username := vars["username"]
if v := context.Get(r, "user"); v != nil {
if v.(*User).Username != username {
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return
}
}
recs, err := GetRecords(username)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
b, _ := json.Marshal(recs)
w.Write(b)
}
func GetRecordsByDateHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
username := vars["username"]
dateStr := vars["dateStr"]
if v := context.Get(r, "user"); v != nil {
if v.(*User).Username != username {
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return
}
}
recs, err := GetRecordsByDate(username, dateStr)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
b, _ := json.Marshal(recs)
w.Write(b)
}
func AddWhiteListHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
username := vars["username"]
if v := context.Get(r, "user"); v != nil {
if v.(*User).Username != username {
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return
}
}
form, err := jason.NewObjectFromReader(r.Body)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
word, err := form.GetString("word")
if err != nil {
http.Error(w, err.Error(), 500)
return
}
err = AddWhiteList(username, word)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
}
func RemoveRecordHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
username := vars["username"]
dateStr := vars["dateStr"]
if v := context.Get(r, "user"); v != nil {
if v.(*User).Username != username {
http.Error(w, "Authorization Failed", http.StatusUnauthorized)
return
}
}
form, err := jason.NewObjectFromReader(r.Body)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
word, err := form.GetString("word")
if err != nil {
http.Error(w, err.Error(), 500)
return
}
err = RemoveRecord(username, dateStr, word)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
}
func main() {
flag.Parse()
var err error
db, err = leveldb.OpenFile(*dbPath, nil)
defer db.Close()
if err != nil {
panic(err)
}
r := mux.NewRouter()
r.HandleFunc("/register", RegisterHandler).Methods("POST")
r.Handle("/{username}/token", NewRouteFilter().AddFilter(AuthFilter).Handler(GetTokenHandler)).Methods("GET")
r.Handle("/{username}/white", NewRouteFilter().AddFilter(AuthFilter).Handler(AddWhiteListHandler)).Methods("POST")
r.Handle("/{username}", NewRouteFilter().AddFilter(AuthFilter).Handler(CreateRecordHandler)).Methods("POST")
r.Handle("/{username}", NewRouteFilter().AddFilter(AuthFilter).Handler(GetRecordsHandler)).Methods("GET")
r.Handle("/{username}/{dateStr}", NewRouteFilter().AddFilter(AuthFilter).Handler(GetRecordsByDateHandler)).Methods("GET")
r.Handle("/{username}/{dateStr}/rm", NewRouteFilter().AddFilter(AuthFilter).Handler(RemoveRecordHandler)).Methods("POST")
http.ListenAndServeTLS(*addr, "./public_key", "./private_key", r)
}