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231package main
import (
"encoding/json"
"flag"
"fmt"
"io/fs"
"os"
"path/filepath"
"strings"
"text/template"
)
type route struct {
Method string
RoutePath string
ImportPath string
Alias string
Handler string
Group string
}
func main() {
src := flag.String("api", "api", "directory of API handlers")
out := flag.String("out", "routes_gen.go", "output file")
pkg := flag.String("pkg", "main", "package name for generated file")
importPre := flag.String("importPREFIX", "", "module import prefix for api")
middlewarePkg := flag.String("middleware", "", "package containing middleware functions")
middlewares := flag.String("middlewares", "loggingMiddleware", "comma-separated list of middleware functions to apply globally")
groupMiddlewares := flag.String("groupMiddlewares", "", "JSON mapping of group to middleware functions, e.g., '{\"users\":\"authMiddleware,rateLimit\"}'")
notFoundHandler := flag.String("notFound", "", "custom 404 handler (format: package.Handler)")
flag.Parse()
if *importPre == "" {
fmt.Fprintln(os.Stderr, "importPREFIX is required")
os.Exit(1)
}
var routes []route
routeGroups := make(map[string]bool)
filepath.WalkDir(*src, func(path string, d fs.DirEntry, err error) error {
if err != nil || d.IsDir() {
return err
}
if !strings.HasSuffix(d.Name(), ".go") {
return nil
}
fileName := strings.TrimSuffix(d.Name(), ".go")
method := strings.ToUpper(fileName)
relDir, err := filepath.Rel(*src, filepath.Dir(path))
if err != nil {
return err
}
segments := strings.Split(relDir, string(os.PathSeparator))
var group string
if len(segments) > 0 && segments[0] != "" {
group = segments[0]
routeGroups[group] = true
}
if group == "" {
group = "root"
routeGroups[group] = true
}
var parts []string
for _, seg := range segments {
if seg == "" || seg == "index" {
continue
}
if strings.HasPrefix(seg, "[") && strings.HasSuffix(seg, "]") {
parts = append(parts, "{"+seg[1:len(seg)-1]+"}")
} else {
parts = append(parts, seg)
}
}
routePath := "/" + strings.Join(parts, "/")
if routePath == "/" {
routePath = "/"
}
importPath := strings.TrimSuffix(filepath.ToSlash(filepath.Join(*importPre, relDir)), "/")
alias := strings.ReplaceAll(relDir, string(os.PathSeparator), "_")
if alias == "" || alias == "." {
alias = filepath.Base(*src)
}
alias = strings.ReplaceAll(alias, "-", "_")
alias = strings.ReplaceAll(alias, ".", "_")
handler := strings.Title(fileName)
routes = append(routes, route{
Method: method,
RoutePath: routePath,
ImportPath: importPath,
Alias: alias,
Handler: handler,
Group: group,
})
return nil
})
f, err := os.Create(*out)
if err != nil {
panic(err)
}
defer f.Close()
tmpl := template.Must(template.New("router").Parse(`// Code generated by fsrouter; DO NOT EDIT.
package {{.Package}}
import (
"fmt"
"net/http"
{{range .Imports}} {{.Alias}} "{{.Path}}"
{{end}}
"github.com/gorilla/mux"
)
// RegisterRoutes creates and returns a router with all API routes registered
func RegisterRoutes() *mux.Router {
r := mux.NewRouter()
// Default 404 handler
r.NotFoundHandler = http.HandlerFunc({{if .NotFound}}{{.NotFound}}{{else}}defaultNotFoundHandler{{end}})
// Global middleware (applied to all routes)
{{range .Middlewares}} r.Use({{.}})
{{end}}// Add more global middleware here
// r.Use(authMiddleware)
// r.Use(corsMiddleware)
{{range $group, $_ := .Groups}}
// Route group for {{$group}}
{{$group}}Router := r.PathPrefix("/{{$group}}").Subrouter()
// Group-specific middleware
{{if index $.GroupMiddlewares $group}}{{range index $.GroupMiddlewares $group}} {{$group}}Router.Use({{.}})
{{end}}{{else}} // Add group-specific middleware here if needed
// {{$group}}Router.Use(someMiddleware){{end}}
{{end}}
{{range .Routes}} {{if .Group}}{{.Group}}Router{{else}}r{{end}}.HandleFunc("{{.RoutePath}}", {{.Alias}}.{{.Handler}}).Methods("{{.Method}}")
{{end}}
return r
}
// Default middleware for logging requests
func loggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("%s %s\n", r.Method, r.URL.Path)
next.ServeHTTP(w, r)
})
}
{{if not .NotFound}}
// Default 404 handler
func defaultNotFoundHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusNotFound)
w.Write([]byte(`{"error": "404 not found", "path": "` + r.URL.Path + `"}`))
}
{{end}}
`))
type importEntry struct {
Path string
Alias string
}
imports := []importEntry{}
importMap := map[string]bool{}
for _, r := range routes {
if !importMap[r.ImportPath] {
imports = append(imports, importEntry{Path: r.ImportPath, Alias: r.Alias})
importMap[r.ImportPath] = true
}
}
if *middlewarePkg != "" {
imports = append(imports, importEntry{Path: *middlewarePkg, Alias: "middleware"})
}
var notFound string
if *notFoundHandler != "" {
notFound = *notFoundHandler
}
middlewareList := strings.Split(*middlewares, ",")
for i, m := range middlewareList {
middlewareList[i] = strings.TrimSpace(m)
}
var groupMiddlewareMap map[string][]string
if *groupMiddlewares != "" {
groupMiddlewareMap = make(map[string][]string)
if err := json.Unmarshal([]byte(*groupMiddlewares), &groupMiddlewareMap); err != nil {
fmt.Fprintln(os.Stderr, "Error parsing groupMiddlewares JSON:", err)
os.Exit(1)
}
}
err = tmpl.Execute(f, struct {
Package string
Imports []importEntry
Routes []route
NotFound string
Groups map[string]bool
Middlewares []string
GroupMiddlewares map[string][]string
}{
Package: *pkg,
Imports: imports,
Routes: routes,
NotFound: notFound,
Groups: routeGroups,
Middlewares: middlewareList,
GroupMiddlewares: groupMiddlewareMap,
})
if err != nil {
panic(err)
}
fmt.Printf("Generated %s with %d routes in %d groups\n", *out, len(routes), len(routeGroups))
}