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handlers.go
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handlers.go
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// Statping
// Copyright (C) 2018. Hunter Long and the project contributors
// Written by Hunter Long <info@socialeck.com> and the project contributors
//
// https://github.com/hunterlong/statping
//
// The licenses for most software and other practical works are designed
// to take away your freedom to share and change the works. By contrast,
// the GNU General Public License is intended to guarantee your freedom to
// share and change all versions of a program--to make sure it remains free
// software for all its users.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package handlers
import (
"crypto/tls"
"encoding/json"
"fmt"
"github.com/gorilla/sessions"
"github.com/hunterlong/statping/core"
"github.com/hunterlong/statping/source"
"github.com/hunterlong/statping/types"
"github.com/hunterlong/statping/utils"
"html/template"
"net/http"
"os"
"strings"
"time"
)
const (
cookieKey = "statping_auth"
timeout = time.Second * 30
)
var (
sessionStore *sessions.CookieStore
httpServer *http.Server
usingSSL bool
mainTmpl = `{{define "main" }} {{ template "base" . }} {{ end }}`
templates = []string{"base.gohtml", "head.gohtml", "nav.gohtml", "footer.gohtml", "scripts.gohtml", "form_service.gohtml", "form_notifier.gohtml", "form_group.gohtml", "form_user.gohtml", "form_checkin.gohtml", "form_message.gohtml"}
javascripts = []string{"charts.js", "chart_index.js"}
mainTemplate *template.Template
)
// RunHTTPServer will start a HTTP server on a specific IP and port
func RunHTTPServer(ip string, port int) error {
host := fmt.Sprintf("%v:%v", ip, port)
key := utils.FileExists(utils.Directory + "/server.key")
cert := utils.FileExists(utils.Directory + "/server.crt")
if key && cert {
utils.Log(1, "server.cert and server.key was found in root directory! Starting in SSL mode.")
utils.Log(1, fmt.Sprintf("Statping Secure HTTPS Server running on https://%v:%v", ip, 443))
usingSSL = true
} else {
utils.Log(1, "Statping HTTP Server running on http://"+host)
}
router = Router()
resetCookies()
if usingSSL {
cfg := &tls.Config{
MinVersion: tls.VersionTLS12,
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
},
}
srv := &http.Server{
Addr: fmt.Sprintf("%v:%v", ip, 443),
Handler: router,
TLSConfig: cfg,
TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler), 0),
WriteTimeout: timeout,
ReadTimeout: timeout,
IdleTimeout: timeout,
}
return srv.ListenAndServeTLS(utils.Directory+"/server.crt", utils.Directory+"/server.key")
} else {
httpServer = &http.Server{
Addr: host,
WriteTimeout: timeout,
ReadTimeout: timeout,
IdleTimeout: timeout,
Handler: router,
}
httpServer.SetKeepAlivesEnabled(false)
return httpServer.ListenAndServe()
}
return nil
}
// IsReadAuthenticated will allow Read Only authentication for some routes
func IsReadAuthenticated(r *http.Request) bool {
var token string
query := r.URL.Query()
key := query.Get("api")
if key == core.CoreApp.ApiKey {
return true
}
tokens, ok := r.Header["Authorization"]
if ok && len(tokens) >= 1 {
token = tokens[0]
token = strings.TrimPrefix(token, "Bearer ")
if token == core.CoreApp.ApiKey {
return true
}
}
return IsFullAuthenticated(r)
}
// IsFullAuthenticated returns true if the HTTP request is authenticated. You can set the environment variable GO_ENV=test
// to bypass the admin authenticate to the dashboard features.
func IsFullAuthenticated(r *http.Request) bool {
if os.Getenv("GO_ENV") == "test" {
return true
}
if core.CoreApp == nil {
return true
}
if sessionStore == nil {
return true
}
var token string
tokens, ok := r.Header["Authorization"]
if ok && len(tokens) >= 1 {
token = tokens[0]
token = strings.TrimPrefix(token, "Bearer ")
if token == core.CoreApp.ApiSecret {
return true
}
}
return IsAdmin(r)
}
// IsAdmin returns true if the user session is an administrator
func IsAdmin(r *http.Request) bool {
session, err := sessionStore.Get(r, cookieKey)
if err != nil {
return false
}
if session.Values["admin"] == nil {
return false
}
return session.Values["admin"].(bool)
}
// IsUser returns true if the user is registered
func IsUser(r *http.Request) bool {
if os.Getenv("GO_ENV") == "test" {
return true
}
session, err := sessionStore.Get(r, cookieKey)
if err != nil {
return false
}
if session.Values["authenticated"] == nil {
return false
}
return session.Values["authenticated"].(bool)
}
func loadTemplate(w http.ResponseWriter, r *http.Request) error {
var err error
mainTemplate = template.New("main")
mainTemplate.Funcs(handlerFuncs(w, r))
mainTemplate, err = mainTemplate.Parse(mainTmpl)
if err != nil {
utils.Log(4, err)
return err
}
// render all templates
mainTemplate.Funcs(handlerFuncs(w, r))
for _, temp := range templates {
tmp, _ := source.TmplBox.String(temp)
mainTemplate, err = mainTemplate.Parse(tmp)
if err != nil {
utils.Log(4, err)
return err
}
}
// render all javascript files
for _, temp := range javascripts {
tmp, _ := source.JsBox.String(temp)
mainTemplate, err = mainTemplate.Parse(tmp)
if err != nil {
utils.Log(4, err)
return err
}
}
return err
}
// ExecuteResponse will render a HTTP response for the front end user
func ExecuteResponse(w http.ResponseWriter, r *http.Request, file string, data interface{}, redirect interface{}) {
utils.Http(r)
if url, ok := redirect.(string); ok {
http.Redirect(w, r, url, http.StatusSeeOther)
return
}
if usingSSL {
w.Header().Add("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
}
loadTemplate(w, r)
render, err := source.TmplBox.String(file)
if err != nil {
utils.Log(4, err)
}
// render the page requested
if _, err := mainTemplate.Parse(render); err != nil {
utils.Log(4, err)
}
// execute the template
if err := mainTemplate.Execute(w, data); err != nil {
utils.Log(4, err)
}
}
// executeJSResponse will render a Javascript response
func executeJSResponse(w http.ResponseWriter, r *http.Request, file string, data interface{}) {
render, err := source.JsBox.String(file)
if err != nil {
utils.Log(4, err)
}
if usingSSL {
w.Header().Add("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
}
t := template.New("charts")
t.Funcs(template.FuncMap{
"safe": func(html string) template.HTML {
return template.HTML(html)
},
"Services": func() []types.ServiceInterface {
return core.CoreApp.Services
},
})
if _, err := t.Parse(render); err != nil {
utils.Log(4, err)
}
if err := t.Execute(w, data); err != nil {
utils.Log(4, err)
}
}
func returnJson(d interface{}, w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(d)
}
// error404Handler is a HTTP handler for 404 error pages
func error404Handler(w http.ResponseWriter, r *http.Request) {
if usingSSL {
w.Header().Add("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
}
w.WriteHeader(http.StatusNotFound)
ExecuteResponse(w, r, "error_404.gohtml", nil, nil)
}