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keygen.go
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keygen.go
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package pezauth
import (
"fmt"
"strings"
"github.com/garyburd/redigo/redis"
)
//NewKeyGen - create a new implementation of a KeyGenerator interface
func NewKeyGen(doer func() Doer, guid GUIDMaker) KeyGenerator {
return &KeyGen{
store: doer,
guidMaker: guid,
}
}
func parseKeysResponse(r interface{}) (key, username, hash string, err error) {
if resArr := r.([]interface{}); len(resArr) > 0 {
ba := resArr[0].([]byte)
hash = string(ba[:])
key, username, err = hashSplit(hash)
} else {
err = ErrEmptyKeyResponse
}
return
}
func (s *KeyGen) getHashMap(hash string) (res interface{}, err error) {
var byteResponse interface{}
byteResponse, err = s.store().Do("HMGET", redis.Args{hash}.Add(HMFieldActive).Add(HMFieldDetails)...)
castedByteResponse := byteResponse.([]interface{})
if len(castedByteResponse) == 2 {
res = map[string]interface{}{
HMFieldActive: string(castedByteResponse[0].([]byte)[:]),
HMFieldDetails: string(castedByteResponse[1].([]byte)[:]),
}
} else {
res = byteResponse
}
return
}
//Get - gets a key for a user
func (s *KeyGen) Get(user string) (res string, err error) {
var r interface{}
search := fmt.Sprintf("%s:*", user)
if r, err = s.store().Do("KEYS", search); r != nil && err == nil {
res, _, _, err = parseKeysResponse(r)
}
return
}
//GetByKey - gets a user for a given key
func (s *KeyGen) GetByKey(key string) (hash string, val interface{}, err error) {
var r interface{}
search := fmt.Sprintf("*:%s", key)
if r, err = s.store().Do("KEYS", search); r != nil && err == nil {
if _, _, hash, err = parseKeysResponse(r); err == nil {
val, err = s.getHashMap(hash)
}
}
return
}
func (s *KeyGen) getHash(user string) (hash string, err error) {
var r interface{}
search := fmt.Sprintf("%s:*", user)
if r, err = s.store().Do("KEYS", search); r != nil && err == nil {
_, _, hash, err = parseKeysResponse(r)
}
return
}
func hashSplit(hash string) (key, username string, err error) {
usernameIndex := 0
keyIndex := 1
hashSplitArrayLen := 2
if splitHash := strings.Split(hash, ":"); len(splitHash) == hashSplitArrayLen {
key = splitHash[keyIndex]
username = splitHash[usernameIndex]
} else {
err = ErrUnparsableHash
}
return
}
func createHash(user, guid string) (hash string) {
hash = fmt.Sprintf("%s:%s", user, guid)
return
}
//Create - creates a new key for a user
func (s *KeyGen) Create(user string, details string) (err error) {
guid := s.guidMaker.Create()
hash := createHash(user, guid)
row := map[string]string{
HMFieldActive: "true",
HMFieldDetails: details,
}
_, err = s.store().Do("HMSET", redis.Args{hash}.AddFlat(row)...)
return
}
//Delete - deletes a key for a user
func (s *KeyGen) Delete(user string) (err error) {
var apikey string
if apikey, err = s.Get(user); err == nil {
_, err = s.store().Do("DEL", createHash(user, apikey))
}
return
}