gosora/router_gen/main.go

548 lines
16 KiB
Go

/* WIP Under Construction */
package main
import (
"bytes"
"log"
"os"
"strconv"
"text/template"
)
var routeList []*RouteImpl
var routeGroups []*RouteGroup
type TmplVars struct {
RouteList []*RouteImpl
RouteGroups []*RouteGroup
AllRouteNames []string
AllRouteMap map[string]int
AllAgentNames []string
AllAgentMap map[string]int
}
func main() {
log.Println("Generating the router...")
// Load all the routes...
routes()
var tmplVars = TmplVars{
RouteList: routeList,
RouteGroups: routeGroups,
}
var allRouteNames []string
var allRouteMap = make(map[string]int)
var out string
var mapIt = func(name string) {
allRouteNames = append(allRouteNames, name)
allRouteMap[name] = len(allRouteNames) - 1
}
var countToIndents = func(indent int) (indentor string) {
for i := 0; i < indent; i++ {
indentor += "\t"
}
return indentor
}
var runBefore = func(runnables []Runnable, indent int) (out string) {
var indentor = countToIndents(indent)
if len(runnables) > 0 {
for _, runnable := range runnables {
if runnable.Literal {
out += "\n\t" + indentor + runnable.Contents
} else {
out += "\n" + indentor + "err = common." + runnable.Contents + "(w,req,user)\n" +
indentor + "if err != nil {\n" +
indentor + "\trouter.handleError(err,w,req,user)\n" +
indentor + "\treturn\n" +
indentor + "}\n" + indentor
}
}
}
return out
}
for _, route := range routeList {
mapIt(route.Name)
var end = len(route.Path) - 1
out += "\n\t\tcase \"" + route.Path[0:end] + "\":"
out += runBefore(route.RunBefore, 4)
out += "\n\t\t\tcommon.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[route.Name]) + ")"
out += "\n\t\t\terr = " + route.Name + "(w,req,user"
for _, item := range route.Vars {
out += "," + item
}
out += `)
if err != nil {
router.handleError(err,w,req,user)
}`
}
for _, group := range routeGroups {
var end = len(group.Path) - 1
out += "\n\t\tcase \"" + group.Path[0:end] + "\":"
out += runBefore(group.RunBefore, 3)
out += "\n\t\t\tswitch(req.URL.Path) {"
var defaultRoute = blankRoute()
for _, route := range group.RouteList {
if group.Path == route.Path {
defaultRoute = route
continue
}
mapIt(route.Name)
out += "\n\t\t\t\tcase \"" + route.Path + "\":"
if len(route.RunBefore) > 0 {
skipRunnable:
for _, runnable := range route.RunBefore {
for _, gRunnable := range group.RunBefore {
if gRunnable.Contents == runnable.Contents {
continue
}
// TODO: Stop hard-coding these
if gRunnable.Contents == "AdminOnly" && runnable.Contents == "MemberOnly" {
continue skipRunnable
}
if gRunnable.Contents == "AdminOnly" && runnable.Contents == "SuperModOnly" {
continue skipRunnable
}
if gRunnable.Contents == "SuperModOnly" && runnable.Contents == "MemberOnly" {
continue skipRunnable
}
}
if runnable.Literal {
out += "\n\t\t\t\t\t" + runnable.Contents
} else {
out += `
err = common.` + runnable.Contents + `(w,req,user)
if err != nil {
router.handleError(err,w,req,user)
return
}
`
}
}
}
out += "\n\t\t\t\t\tcommon.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[route.Name]) + ")"
out += "\n\t\t\t\t\terr = " + route.Name + "(w,req,user"
for _, item := range route.Vars {
out += "," + item
}
out += ")"
}
if defaultRoute.Name != "" {
mapIt(defaultRoute.Name)
out += "\n\t\t\t\tdefault:"
out += runBefore(defaultRoute.RunBefore, 4)
out += "\n\t\t\t\t\tcommon.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[defaultRoute.Name]) + ")"
out += "\n\t\t\t\t\terr = " + defaultRoute.Name + "(w,req,user"
for _, item := range defaultRoute.Vars {
out += ", " + item
}
out += ")"
}
out += `
}
if err != nil {
router.handleError(err,w,req,user)
}`
}
// Stubs for us to refer to these routes through
mapIt("routeDynamic")
mapIt("routeUploads")
tmplVars.AllRouteNames = allRouteNames
tmplVars.AllRouteMap = allRouteMap
tmplVars.AllAgentNames = []string{
"unknown",
"firefox",
"chrome",
"opera",
"safari",
"edge",
"internetexplorer",
"googlebot",
"yandex",
"bing",
"baidu",
"duckduckgo",
"discord",
"cloudflarealwayson",
"uptimebot",
"lynx",
"blank",
"malformed",
}
tmplVars.AllAgentMap = make(map[string]int)
for id, agent := range tmplVars.AllAgentNames {
tmplVars.AllAgentMap[agent] = id
}
var fileData = `// Code generated by. DO NOT EDIT.
/* This file was automatically generated by the software. Please don't edit it as your changes may be overwritten at any moment. */
package main
import (
"log"
"strings"
"sync"
"errors"
"net/http"
"./common"
"./routes"
)
var ErrNoRoute = errors.New("That route doesn't exist.")
// TODO: What about the /uploads/ route? x.x
var RouteMap = map[string]interface{}{ {{range .AllRouteNames}}
"{{.}}": {{.}},{{end}}
}
// ! NEVER RELY ON THESE REMAINING THE SAME BETWEEN COMMITS
var routeMapEnum = map[string]int{ {{range $index, $element := .AllRouteNames}}
"{{$element}}": {{$index}},{{end}}
}
var reverseRouteMapEnum = map[int]string{ {{range $index, $element := .AllRouteNames}}
{{$index}}: "{{$element}}",{{end}}
}
var agentMapEnum = map[string]int{ {{range $index, $element := .AllAgentNames}}
"{{$element}}": {{$index}},{{end}}
}
var reverseAgentMapEnum = map[int]string{ {{range $index, $element := .AllAgentNames}}
{{$index}}: "{{$element}}",{{end}}
}
// TODO: Stop spilling these into the package scope?
func init() {
common.SetRouteMapEnum(routeMapEnum)
common.SetReverseRouteMapEnum(reverseRouteMapEnum)
common.SetAgentMapEnum(agentMapEnum)
common.SetReverseAgentMapEnum(reverseAgentMapEnum)
}
type GenRouter struct {
UploadHandler func(http.ResponseWriter, *http.Request)
extraRoutes map[string]func(http.ResponseWriter, *http.Request, common.User) common.RouteError
sync.RWMutex
}
func NewGenRouter(uploads http.Handler) *GenRouter {
return &GenRouter{
UploadHandler: http.StripPrefix("/uploads/",uploads).ServeHTTP,
extraRoutes: make(map[string]func(http.ResponseWriter, *http.Request, common.User) common.RouteError),
}
}
func (router *GenRouter) handleError(err common.RouteError, w http.ResponseWriter, r *http.Request, user common.User) {
if err.Handled() {
return
}
if err.Type() == "system" {
common.InternalErrorJSQ(err, w, r, err.JSON())
return
}
common.LocalErrorJSQ(err.Error(), w, r, user,err.JSON())
}
func (router *GenRouter) Handle(_ string, _ http.Handler) {
}
func (router *GenRouter) HandleFunc(pattern string, handle func(http.ResponseWriter, *http.Request, common.User) common.RouteError) {
router.Lock()
defer router.Unlock()
router.extraRoutes[pattern] = handle
}
func (router *GenRouter) RemoveFunc(pattern string) error {
router.Lock()
defer router.Unlock()
_, ok := router.extraRoutes[pattern]
if !ok {
return ErrNoRoute
}
delete(router.extraRoutes, pattern)
return nil
}
// TODO: Pass the default route or config struct to the router rather than accessing it via a package global
// TODO: SetDefaultRoute
// TODO: GetDefaultRoute
func (router *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if len(req.URL.Path) == 0 || req.URL.Path[0] != '/' || req.Host != common.Site.Host {
w.WriteHeader(405)
w.Write([]byte(""))
log.Print("Malformed Request")
log.Print("UA: ", req.UserAgent())
log.Print("Method: ", req.Method)
for key, value := range req.Header {
for _, vvalue := range value {
log.Print("Header '" + key + "': " + vvalue + "!!")
}
}
log.Print("req.Host: ", req.Host)
log.Print("req.URL.Path: ", req.URL.Path)
log.Print("req.URL.RawQuery: ", req.URL.RawQuery)
log.Print("req.Referer(): ", req.Referer())
log.Print("req.RemoteAddr: ", req.RemoteAddr)
common.AgentViewCounter.Bump({{.AllAgentMap.malformed}})
return
}
if common.Dev.DebugMode {
// TODO: Cover more suspicious strings and at a lower layer than this
for _, char := range req.URL.Path {
if char != '&' && !(char > 44 && char < 58) && char != '=' && char != '?' && !(char > 64 && char < 91) && char != '\\' && char != '_' && !(char > 96 && char < 123) {
log.Print("Suspicious UA: ", req.UserAgent())
log.Print("Method: ", req.Method)
for key, value := range req.Header {
for _, vvalue := range value {
log.Print("Header '" + key + "': " + vvalue + "!!")
}
}
log.Print("req.Host: ", req.Host)
log.Print("req.URL.Path: ", req.URL.Path)
log.Print("req.URL.RawQuery: ", req.URL.RawQuery)
log.Print("req.Referer(): ", req.Referer())
log.Print("req.RemoteAddr: ", req.RemoteAddr)
break
}
}
if strings.Contains(req.URL.Path,"..") || strings.Contains(req.URL.Path,"--") {
log.Print("Suspicious UA: ", req.UserAgent())
log.Print("Method: ", req.Method)
for key, value := range req.Header {
for _, vvalue := range value {
log.Print("Header '" + key + "': " + vvalue + "!!")
}
}
log.Print("req.Host: ", req.Host)
log.Print("req.URL.Path: ", req.URL.Path)
log.Print("req.URL.RawQuery: ", req.URL.RawQuery)
log.Print("req.Referer(): ", req.Referer())
log.Print("req.RemoteAddr: ", req.RemoteAddr)
}
}
var prefix, extraData string
prefix = req.URL.Path[0:strings.IndexByte(req.URL.Path[1:],'/') + 1]
if req.URL.Path[len(req.URL.Path) - 1] != '/' {
extraData = req.URL.Path[strings.LastIndexByte(req.URL.Path,'/') + 1:]
req.URL.Path = req.URL.Path[:strings.LastIndexByte(req.URL.Path,'/') + 1]
}
if common.Dev.SuperDebug {
log.Print("before routeStatic")
log.Print("Method: ", req.Method)
for key, value := range req.Header {
for _, vvalue := range value {
log.Print("Header '" + key + "': " + vvalue + "!!")
}
}
log.Print("prefix: ", prefix)
log.Print("req.Host: ", req.Host)
log.Print("req.URL.Path: ", req.URL.Path)
log.Print("req.URL.RawQuery: ", req.URL.RawQuery)
log.Print("extraData: ", extraData)
log.Print("req.Referer(): ", req.Referer())
log.Print("req.RemoteAddr: ", req.RemoteAddr)
}
if prefix == "/static" {
req.URL.Path += extraData
routeStatic(w, req)
return
}
if common.Dev.SuperDebug {
log.Print("before PreRoute")
}
// Increment the global view counter
common.GlobalViewCounter.Bump()
// Track the user agents. Unfortunately, everyone pretends to be Mozilla, so this'll be a little less efficient than I would like.
// TODO: Add a setting to disable this?
// TODO: Use a more efficient detector instead of smashing every possible combination in
ua := strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(req.UserAgent(),"Mozilla/5.0 ")," Safari/537.36")) // Noise, no one's going to be running this and it complicates implementing an efficient UA parser, particularly the more efficient right-to-left one I have in mind
switch {
case strings.Contains(ua,"Google"):
common.AgentViewCounter.Bump({{.AllAgentMap.googlebot}})
case strings.Contains(ua,"Yandex"):
common.AgentViewCounter.Bump({{.AllAgentMap.yandex}})
case strings.Contains(ua,"bingbot"), strings.Contains(ua,"BingPreview"):
common.AgentViewCounter.Bump({{.AllAgentMap.bing}})
case strings.Contains(ua,"OPR"): // Pretends to be Chrome, needs to run before that
common.AgentViewCounter.Bump({{.AllAgentMap.opera}})
case strings.Contains(ua,"Edge"):
common.AgentViewCounter.Bump({{.AllAgentMap.edge}})
case strings.Contains(ua,"Chrome"):
common.AgentViewCounter.Bump({{.AllAgentMap.chrome}})
case strings.Contains(ua,"Firefox"):
common.AgentViewCounter.Bump({{.AllAgentMap.firefox}})
case strings.Contains(ua,"Safari"):
common.AgentViewCounter.Bump({{.AllAgentMap.safari}})
case strings.Contains(ua,"MSIE"):
common.AgentViewCounter.Bump({{.AllAgentMap.internetexplorer}})
case strings.Contains(ua,"Baiduspider"):
common.AgentViewCounter.Bump({{.AllAgentMap.baidu}})
case strings.Contains(ua,"DuckDuckBot"):
common.AgentViewCounter.Bump({{.AllAgentMap.duckduckgo}})
case strings.Contains(ua,"Discordbot"):
common.AgentViewCounter.Bump({{.AllAgentMap.discord}})
case strings.Contains(ua,"Lynx"):
common.AgentViewCounter.Bump({{.AllAgentMap.lynx}})
case strings.Contains(ua,"CloudFlare-AlwaysOnline"):
common.AgentViewCounter.Bump({{.AllAgentMap.cloudflarealwayson}})
case strings.Contains(ua,"Uptimebot"):
common.AgentViewCounter.Bump({{.AllAgentMap.uptimebot}})
case ua == "":
common.AgentViewCounter.Bump({{.AllAgentMap.blank}})
if common.Dev.DebugMode {
log.Print("Blank UA: ", req.UserAgent())
log.Print("Method: ", req.Method)
for key, value := range req.Header {
for _, vvalue := range value {
log.Print("Header '" + key + "': " + vvalue + "!!")
}
}
log.Print("prefix: ", prefix)
log.Print("req.Host: ", req.Host)
log.Print("req.URL.Path: ", req.URL.Path)
log.Print("req.URL.RawQuery: ", req.URL.RawQuery)
log.Print("extraData: ", extraData)
log.Print("req.Referer(): ", req.Referer())
log.Print("req.RemoteAddr: ", req.RemoteAddr)
}
default:
common.AgentViewCounter.Bump({{.AllAgentMap.unknown}})
if common.Dev.DebugMode {
log.Print("Unknown UA: ", req.UserAgent())
log.Print("Method: ", req.Method)
for key, value := range req.Header {
for _, vvalue := range value {
log.Print("Header '" + key + "': " + vvalue + "!!")
}
}
log.Print("prefix: ", prefix)
log.Print("req.Host: ", req.Host)
log.Print("req.URL.Path: ", req.URL.Path)
log.Print("req.URL.RawQuery: ", req.URL.RawQuery)
log.Print("extraData: ", extraData)
log.Print("req.Referer(): ", req.Referer())
log.Print("req.RemoteAddr: ", req.RemoteAddr)
}
}
// Deal with the session stuff, etc.
user, ok := common.PreRoute(w, req)
if !ok {
return
}
if common.Dev.SuperDebug {
log.Print("after PreRoute")
log.Print("routeMapEnum: ", routeMapEnum)
}
var err common.RouteError
switch(prefix) {` + out + `
/*case "/sitemaps": // TODO: Count these views
req.URL.Path += extraData
err = sitemapSwitch(w,req)
if err != nil {
router.handleError(err,w,req,user)
}*/
case "/uploads":
if extraData == "" {
common.NotFound(w,req)
return
}
common.RouteViewCounter.Bump({{.AllRouteMap.routeUploads}})
req.URL.Path += extraData
// TODO: Find a way to propagate errors up from this?
router.UploadHandler(w,req) // TODO: Count these views
case "":
// Stop the favicons, robots.txt file, etc. resolving to the topics list
// TODO: Add support for favicons and robots.txt files
switch(extraData) {
case "robots.txt":
err = routeRobotsTxt(w,req) // TODO: Count these views
if err != nil {
router.handleError(err,w,req,user)
}
return
/*case "sitemap.xml":
err = routeSitemapXml(w,req) // TODO: Count these views
if err != nil {
router.handleError(err,w,req,user)
}
return*/
}
if extraData != "" {
common.NotFound(w,req)
return
}
handle, ok := RouteMap[common.Config.DefaultRoute]
if !ok {
// TODO: Make this a startup error not a runtime one
log.Print("Unable to find the default route")
common.NotFound(w,req)
return
}
common.RouteViewCounter.Bump(routeMapEnum[common.Config.DefaultRoute])
handle.(func(http.ResponseWriter, *http.Request, common.User) common.RouteError)(w,req,user)
default:
// A fallback for the routes which haven't been converted to the new router yet or plugins
router.RLock()
handle, ok := router.extraRoutes[req.URL.Path]
router.RUnlock()
if ok {
common.RouteViewCounter.Bump({{.AllRouteMap.routeDynamic}}) // TODO: Be more specific about *which* dynamic route it is
req.URL.Path += extraData
err = handle(w,req,user)
if err != nil {
router.handleError(err,w,req,user)
}
return
}
common.NotFound(w,req) // TODO: Collect all the error view counts so we can add a replacement for GlobalViewCounter by adding up the view counts of every route? Complex and may be inaccurate, collecting it globally and locally would at-least help find places we aren't capturing views
}
}
`
var tmpl = template.Must(template.New("router").Parse(fileData))
var b bytes.Buffer
err := tmpl.Execute(&b, tmplVars)
if err != nil {
log.Fatal(err)
}
writeFile("./gen_router.go", string(b.Bytes()))
log.Println("Successfully generated the router")
}
func writeFile(name string, content string) {
f, err := os.Create(name)
if err != nil {
log.Fatal(err)
}
_, err = f.WriteString(content)
if err != nil {
log.Fatal(err)
}
f.Sync()
f.Close()
}