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GoPage.go
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GoPage.go
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package main
import (
"compress/gzip"
"fmt"
config "github.com/confused-Techie/GoPage/src/pkg/config"
handler "github.com/confused-Techie/GoPage/src/pkg/handler"
model "github.com/confused-Techie/GoPage/src/pkg/model"
modifySettings "github.com/confused-Techie/GoPage/src/pkg/modifySettings"
searchfeatures "github.com/confused-Techie/GoPage/src/pkg/searchfeatures"
universalMethods "github.com/confused-Techie/GoPage/src/pkg/universalMethods"
httpsnoop "github.com/felixge/httpsnoop"
"github.com/spf13/viper"
"io"
"io/ioutil"
"log"
"net/http"
"strings"
"sync"
"time"
)
// Below no caching mechanism borrowed from elithrar stackoverflow
// Or more percisley their repo: zenazn/goji
var epoch = time.Unix(0, 0).Format(time.RFC1123)
var noCacheHeaders = map[string]string{
"Expires": epoch,
"Cache-Control": "no-cache, private, max-age=0",
"Pragma": "no-cache",
"X-Accel-Expires": "0",
}
var etagHeaders = []string{
"ETag",
"If-Modified-Since",
"If-Match",
"If-None-Match",
"If-Range",
"If-Unmodified-Since",
}
func noCache(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
// Delete any ETag headers that may have been set
for _, v := range etagHeaders {
if r.Header.Get(v) != "" {
r.Header.Del(v)
}
}
// Set our NoCahce Headers
for k, v := range noCacheHeaders {
w.Header().Set(k, v)
}
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
func requestGetRemoteAddress(r *http.Request) string {
hdr := r.Header
hdrRealIP := hdr.Get("X-Real-Ip")
hdrForwardedFor := hdr.Get("X-Forwarded-For")
if hdrRealIP == "" && hdrForwardedFor == "" {
return r.RemoteAddr
}
if hdrForwardedFor != "" {
// X-Forwarded-For is potentially a list of addresses seperated with ","
parts := strings.Split(hdrForwardedFor, ",")
for i, p := range parts {
parts[i] = strings.TrimSpace(p)
}
// TODO: should return first non-local address
return parts[0]
}
return hdrRealIP
}
func cacheControl(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
ptStatus, ptRes := universalMethods.PathTraversalAvoidance(r.URL.String())
if ptStatus {
fmt.Println(ptRes)
return
}
modtime := universalMethods.LastModifiedTime(ptRes)
w.Header().Set("Cache-Control", "max-age=2592000") // 30 Days
w.Header().Set("Last-Modified", modtime)
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
type gzipResponseWriter struct {
io.Writer
http.ResponseWriter
}
func customgzipHandler(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
// check if the client can accept gzip compressed content
if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
// cannot accept
return
}
// can accept
// set HTTP header indicated encoding
w.Header().Set("Content-Encoding", "gzip")
gz := gzip.NewWriter(w)
defer gz.Close()
h.ServeHTTP(&gzipResponseWriter{Writer: gz, ResponseWriter: w}, r)
//return gzipResponseWriter{Writer: gz, ResponseWriter: w}
}
return http.HandlerFunc(fn)
}
var gzPool = sync.Pool{
New: func() interface{} {
w := gzip.NewWriter(ioutil.Discard)
gzip.NewWriterLevel(w, gzip.BestCompression)
//gzip.NewWriterLevel(w, gzip.BestSpeed)
return w
},
}
func (w *gzipResponseWriter) WriteHeader(status int) {
w.Header().Del("Content-Length")
w.ResponseWriter.WriteHeader(status)
}
func (w *gzipResponseWriter) Write(b []byte) (int, error) {
return w.Writer.Write(b)
}
func gzipHandler(h http.Handler) http.Handler {
//https://stackoverflow.com/a/64433192/12707685
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// check if the client can accept gzip compressed content
if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
// cannot accept, return serving
h.ServeHTTP(w, r)
return
}
// can accept, set http headers
w.Header().Set("Content-Encoding", "gzip")
gz := gzPool.Get().(*gzip.Writer)
defer gzPool.Put(gz)
gz.Reset(w)
defer gz.Close()
h.ServeHTTP(&gzipResponseWriter{ResponseWriter: w, Writer: gz}, r)
})
}
func logRequestHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
//h.ServeHTTP(w, r)
ri := &model.HTTPReqInfo{
Method: r.Method,
URI: r.URL.String(),
Referer: r.Header.Get("Referer"),
UserAgent: r.Header.Get("User-Agent"),
Protocol: r.Proto,
Ipaddr: requestGetRemoteAddress(r),
}
// httpsnoop runs its own handler, so h.ServeHTTP(w, r) is no longer needed
snoop := httpsnoop.CaptureMetrics(h, w, r)
ri.Code = snoop.Code
ri.Size = snoop.Written
ri.Duration = snoop.Duration
logMethod := model.ServSettingGetLogging()
const (
NCSACommonFormat = "02/Jan/2006:15:04:05 -0700"
)
date := time.Now()
if logMethod == "combined" {
fmt.Printf("%s - - [%s] '%s %s %s' %d %d '%s' '%s'\n", universalMethods.LogInjectionAvoidance(ri.Ipaddr), date.Format(NCSACommonFormat), universalMethods.LogInjectionAvoidance(ri.Method), universalMethods.LogInjectionAvoidance(ri.URI), universalMethods.LogInjectionAvoidance(ri.Protocol), ri.Code, ri.Size, universalMethods.LogInjectionAvoidance(ri.Referer), universalMethods.LogInjectionAvoidance(ri.UserAgent))
}
if logMethod == "common" {
fmt.Printf("%s - - [%s] '%s %s %s' %d %d\n", universalMethods.LogInjectionAvoidance(ri.Ipaddr), date.Format(NCSACommonFormat), universalMethods.LogInjectionAvoidance(ri.Method), universalMethods.LogInjectionAvoidance(ri.URI), universalMethods.LogInjectionAvoidance(ri.Protocol), ri.Code, ri.Size)
}
if logMethod == "custom" {
log.Printf("'%s %s' from %s - %d %dB in %v\n", universalMethods.LogInjectionAvoidance(ri.Method), universalMethods.LogInjectionAvoidance(ri.URI), universalMethods.LogInjectionAvoidance(ri.Ipaddr), ri.Code, ri.Size, ri.Duration)
}
})
}
func notFoundHandler(h http.Handler) http.Handler {
// Since the HomePage of GoPage is registered to '/' any non-existant path is still registered to the root, and will be redirected there,
// so to properly have a page return 404, it's needed to implement a custom 404 middleware to the HomePage,
// otherwise currently you could type anything after '/' and if its not another valid path it redirects to the homepage
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
w.WriteHeader(http.StatusNotFound)
handler.NotFoundHandler(w, r)
return
}
h.ServeHTTP(w, r)
})
}
func main() {
// Here we can add all viper configuration file/env file setup
// this will grab the proper config location, home of windows or linux, or if dev flag used the local dir
workEnv := config.DetermineEnv()
fmt.Println("Reading Config: \t", workEnv)
// this will then try to grab the config data
config, err := config.LoadConfig(workEnv)
// config from config.go is accidentally redeclared here.
// TODO: Modify all further references to the config variable to a new variable here so config can be used to access the package
if err != nil {
log.Fatal("Cannot load Config: ", err)
}
// this is used to cause a startup check to the language specified
langEnv, err := modifySettings.DetermineLang()
if err != nil {
log.Fatal("Cannot Determine Server Language: ", err)
}
fmt.Println(universalMethods.LogInjectionAvoidance(langEnv))
logEnv, err := modifySettings.DetermineLogging()
if err != nil {
log.Fatal("Cannot Determine")
}
fmt.Println(universalMethods.LogInjectionAvoidance(logEnv))
// this is used to cause a startup check for the robots method
robotsEnv, err := modifySettings.DetermineRobots()
if err != nil {
log.Fatal("Cannot Determine Robots Setting: ", err)
}
fmt.Println(universalMethods.LogInjectionAvoidance(robotsEnv))
// Reading variables using the model. This is for dev purposes
fmt.Println("Server Port: \t", config.Server.Port)
// Start the search Index
searchfeatures.BuildIndex()
// Basic Page Handles: For the standard user pages
mux := http.NewServeMux()
// Standard Page Endpoints
mux.Handle("/", logRequestHandler(notFoundHandler(http.HandlerFunc(handler.HomePageHandler))))
mux.Handle("/settings", logRequestHandler(http.HandlerFunc(handler.SettingsPageHandler)))
mux.Handle("/pluginrepo", logRequestHandler(http.HandlerFunc(handler.PluginRepoPageHandler)))
mux.Handle("/linkhealth", logRequestHandler(http.HandlerFunc(handler.LinkHealthPageHandler)))
mux.Handle("/uploadpage", logRequestHandler(http.HandlerFunc(handler.UploadPageHandler)))
// Components Endpoints
mux.Handle("/robots.txt", http.HandlerFunc(handler.RobotsHandler))
mux.Handle("/sitemap.xml", http.HandlerFunc(handler.SitemapHandler))
mux.Handle("/favicon.ico", logRequestHandler(http.HandlerFunc(handler.FaviconHandler)))
mux.Handle("/favicon_48x48.png", logRequestHandler(http.HandlerFunc(handler.Favicon48Handler)))
// UploadPage Endpoints: Used for the functionality of the uploadPage
mux.Handle("/upload", http.HandlerFunc(handler.UploadHandler))
mux.Handle("/userimages", http.HandlerFunc(handler.UserImagesHandler))
// Plugin Repo Endpoints: Used for the functionality of the PluginRepo
mux.Handle("/plugins/install", http.HandlerFunc(handler.APIInstallPlugin))
mux.Handle("/plugins/uninstall", http.HandlerFunc(handler.APIUninstallPlugin))
mux.Handle("/plugins/update", http.HandlerFunc(handler.APIUpdatePlugin))
// Modify Link Item Pages
// Carryover from previous format. URL Query based page to delete link, still usable
mux.Handle("/delete/", http.HandlerFunc(handler.DeleteHandler))
// API Endpoints for Modifying Link Items via JSON
mux.Handle("/api/deletelink/", http.HandlerFunc(handler.DeleteLinkItem))
mux.Handle("/api/edit/", http.HandlerFunc(handler.EditLinkItem))
mux.Handle("/api/new/", http.HandlerFunc(handler.AddLinkItem))
// Static Directories Access
// CSS / JS / Language / Images Endpoints
fs := gzipHandler(http.FileServer(http.Dir(viper.GetString("directories.staticAssets"))))
mux.Handle("/assets/", cacheControl(logRequestHandler(http.StripPrefix("/assets/", fs))))
// Plugins Folder: Installed/Available/Installed Plugins Data
plugin := http.FileServer(http.Dir(viper.GetString("directories.plugin")))
mux.Handle("/plugins/", noCache(http.StripPrefix("/plugins/", plugin)))
// API Endpoints
mux.Handle("/api/items", http.HandlerFunc(handler.APIItemsHandler))
mux.Handle("/api/serversettings", http.HandlerFunc(handler.APIServerSettingsGet))
mux.Handle("/api/changelang", http.HandlerFunc(handler.ChangeLang)) // /api/changelang?lang=en
mux.Handle("/api/change", http.HandlerFunc(handler.ChangeMany)) // Used to change many different settings
// ^^ /api/change?id=logging&value=custom /api/change?id=robots&value=private
mux.Handle("/api/usersettings", http.HandlerFunc(handler.APIUserSettingGet))
mux.Handle("/api/usersettingswrite", http.HandlerFunc(handler.UserSettingSet))
mux.Handle("/api/search", http.HandlerFunc(handler.Search))
// API Declarations used for plugins
mux.Handle("/api/ping", http.HandlerFunc(handler.APIPingHandler))
mux.Handle("/api/ping/nossl", http.HandlerFunc(handler.APIPingNoSSLHandler))
mux.Handle("/api/hostname", http.HandlerFunc(handler.APIHostNameHandler))
mux.Handle("/api/hostos", http.HandlerFunc(handler.APIHostOSHandler))
mux.Handle("/api/getinstalledplugins", http.HandlerFunc(handler.APIInstalledPluginsHandler))
// We are wrapping the listen in log.Fatal since it will only ever return an error, but otherwise nil
//log.Fatal(http.ListenAndServe(":"+viper.GetString("server.port"), nil))
log.Fatal(http.ListenAndServe(":"+viper.GetString("server.port"), mux))
}