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public.go
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public.go
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package public
import (
"github.com/spf13/viper"
"gopkg.in/mgo.v2"
"io"
"os"
"log"
"io/ioutil"
"encoding/gob"
"github.com/gorilla/sessions"
"github.com/wendal/errors"
"text/template"
)
const(
MAIN_STORAGE_BUCKET = "nthu-a-plus-storage"
USER_AUTH_SESSION = "user-auth"
USER_ID_SESSION_KEY = "user_id"
USER_PERMISSION_SESSION_KEY = "user_perm"
REVIEWER_AUTH_SESSION = "reviewer-auth"
REVIEWER_ID_SESSION_KEY = "reviewer_id"
GM_AUTH_SESSION = "gm-auth"
GM_ID_SESSION_KEY = "gm_id"
APPLICATION_DB_FORM_COLLECTION = "forms"
APPLICATION_DB_RECOMM_COLLECTION = "recomms"
)
var(
CONFIG_FILE_NAME string = "config"
Config *viper.Viper
DB_ADDRESS string = "127.0.0.1"
mainDbSession *mgo.Session
userDbSession *mgo.Session
applicationDbSession *mgo.Session
miscDbSession *mgo.Session
reviewerDbSession *mgo.Session
stagingDbSession *mgo.Session
//Loggers
LogV *log.Logger
LogD *log.Logger
LogE *log.Logger
LogW *log.Logger
//Session
SessionStorage *sessions.CookieStore
//Cloud Storage Signed URL
StoragePrivateKey []byte
StorageServiceAccountEmail string
RecommLetterSubject string
RecommLetterTmpl *template.Template
)
func init(){
if e := initConfig(); e != nil {
log.Fatalln("Error reading config file: " + e.Error())
panic(e)
}
initLoggers()
if e := initDatabases(); e != nil {
panic(e)
}
initSession()
initStorage()
initRecommLetter()
}
func setDefaultValues(){
Config.SetDefault("log.filePath", "")
Config.SetDefault("log.enableStdOut", false)
Config.SetDefault("log.enableStdErr", false)
Config.SetDefault("server.address", "")
Config.SetDefault("server.port", 8888)
}
func initConfig() error{
Config = viper.New()
Config.SetConfigName(CONFIG_FILE_NAME)
Config.AddConfigPath(".")
Config.AddConfigPath("..")
setDefaultValues()
return Config.ReadInConfig()
}
func initLoggers() {
var writer io.Writer = ioutil.Discard
var errWriter io.Writer = ioutil.Discard
if Config.GetBool("log.enableStdOut") {
writer = io.MultiWriter(writer, os.Stdout)
}
if Config.GetBool("log.enableStdErr") {
errWriter = io.MultiWriter(errWriter, os.Stderr)
}
logFilePath := Config.GetString("log.filePath")
if len(logFilePath) > 0 {
if file, err := os.Open(logFilePath); err == nil {
writer = io.MultiWriter(writer, file)
errWriter = io.MultiWriter(errWriter, file)
}
}
LogV = log.New(writer, "[VERBOSE]:", log.Ldate | log.Ltime | log.Lshortfile)
LogD = log.New(writer, "[DEBUG]:", log.Ldate | log.Ltime | log.Lshortfile)
LogE = log.New(errWriter, "[ERROR]:", log.Ldate | log.Ltime | log.Lshortfile)
LogW = log.New(errWriter, "[WARNING]:", log.Ldate | log.Ltime | log.Lshortfile)
//fmt.Printf("Log enable stdout: %v\n", Config.GetBool("log.enableStdOut"))
//fmt.Printf("Log enable stderr: %v\n", Config.GetBool("log.enableStdErr"))
}
func initDatabases() error {
var err error
if Config.IsSet("db.address") {
DB_ADDRESS = Config.GetString("db.address")
}
if mainDbSession, err = mgo.Dial(DB_ADDRESS); err != nil {
LogE.Println("Error connecting database: " + err.Error())
return err
}
if !Config.IsSet("db.username") || !Config.IsSet("db.password") {
LogE.Println("No database credential")
return nil
}
username := Config.GetString("db.username")
password := Config.GetString("db.password")
//Init user session
userDbSession = mainDbSession.Copy()
err = userDbSession.Login(&mgo.Credential{
Username: username,
Password: password,
Source: "users",
})
if err != nil {
LogE.Println("User database login failed: " + err.Error())
return err
}
//Init application session
applicationDbSession = mainDbSession.Copy()
err = applicationDbSession.Login(&mgo.Credential{
Username: username,
Password: password,
Source: "users",
})
if err != nil {
LogE.Println("Application database login failed: " + err.Error())
return err
}
//Init misc session
miscDbSession = mainDbSession.Copy()
err = miscDbSession.Login(&mgo.Credential{
Username: username,
Password: password,
Source: "users",
})
if err != nil {
LogE.Println("Misc database login failed: " + err.Error())
return err
}
//Init reviewers session
reviewerDbSession = mainDbSession.Copy()
err = reviewerDbSession.Login(&mgo.Credential{
Username: username,
Password: password,
Source: "users",
})
if err != nil {
LogE.Println("Reviewer database login failed: " + err.Error())
return err
}
//Init staging session
stagingDbSession = mainDbSession.Copy()
err = stagingDbSession.Login(&mgo.Credential{
Username: username,
Password: password,
Source: "users",
})
if err != nil {
LogE.Println("Staging database login failed: " + err.Error())
return err
}
return nil
}
func GetNewUserDatabase() *mgo.Database {
s := userDbSession.Copy()
return s.DB("users")
}
func GetNewApplicationDatabase() *mgo.Database {
s := applicationDbSession.Copy()
return s.DB("applications")
}
func GetNewMiscDatabase() *mgo.Database {
s := applicationDbSession.Copy()
return s.DB("misc")
}
func GetNewReviewerDatabase() *mgo.Database {
s := reviewerDbSession.Copy()
return s.DB("reviewers")
}
func GetNewStagingDatabase() *mgo.Database {
s := stagingDbSession.Copy()
return s.DB("staging")
}
func initSession(){
gob.Register(UserPermission(0))
SessionStorage = sessions.NewCookieStore([]byte(/*NewHashString()*/"main-session-storage"))
SessionStorage.MaxAge(86400 * 3) //3 days
}
func initStorage(){
if !Config.IsSet("storage.serviceAccountEmail") || !Config.IsSet("storage.privateKeyPath") {
panic(errors.New("storage.serviceAccountEmail or storage.privateKeyPath not set"))
}
StorageServiceAccountEmail = Config.GetString("storage.serviceAccountEmail")
//LogD.Println("Service account: " + StorageServiceAccountEmail)
privateKeyPath := Config.GetString("storage.privateKeyPath")
if file,err := os.Open(privateKeyPath); err != nil {
panic(errors.New("storage.privateKeyPath not exist"))
}else{
defer file.Close()
if StoragePrivateKey,err = ioutil.ReadAll(file); err != nil {
panic(errors.New("storage.privateKeyPath read file error"))
}else{
//LogD.Printf("Private key length: %d\n", len(StoragePrivateKey))
}
}
}
func initRecommLetter(){
RecommLetterSubject = `NTHU A+ Recommendation Request`;
recommLetterContentTmpl := `
Hi,
This is NTHU A+ management team.
{{.ApplyUser.Name}}({{.ApplyUser.Email}}) wanted to request for your recommendation in his/her application.
If you know about this, please visit {{.RecommUrl}} to leave your recommendation.
Best Regards,
NTHU A+ management team
http://www.nthuaplus.org
`;
var err error
RecommLetterTmpl,err = template.New("recommLetter").Parse(recommLetterContentTmpl)
if err != nil {
panic(errors.New("Error parsing recommendation letter template: " + err.Error()))
}
}