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package backend
import (
"context"
"crypto/sha256"
"crypto/subtle"
"database/sql"
"embed"
"fmt"
"io/fs"
"log/slog"
"net/http"
"os"
"strings"
"time"
"git.anhgelus.world/anhgelus/small-web/backend/storage"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"github.com/go-chi/httplog/v3"
)
const (
Version = "0.5.0"
configKey = "config"
assetsFSKey = "assets_fs"
debugKey = "debug"
loginKey = "login"
)
//go:embed templates
var templates embed.FS
func SetupLogger(debug bool) {
logFormat := httplog.SchemaECS.Concise(!debug)
logLevel := slog.LevelInfo
if debug {
logLevel = slog.LevelDebug
}
logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
ReplaceAttr: logFormat.ReplaceAttr,
Level: logLevel,
})).With(
slog.String("app", "anhgelus/small-web"),
slog.String("version", Version),
)
slog.SetDefault(logger)
}
func NewRouter(debug bool, cfg *Config, db *sql.DB, assets fs.FS) *chi.Mux {
r := chi.NewRouter()
logLevel := slog.LevelWarn
if debug {
logLevel = slog.LevelDebug
}
r.Use(middleware.Timeout(30 * time.Second))
r.Use(httplog.RequestLogger(slog.Default(), &httplog.Options{
Level: logLevel,
// Set log output to Elastic Common Schema (ECS) format.
Schema: httplog.SchemaECS.Concise(!debug),
RecoverPanics: true,
Skip: func(req *http.Request, respStatus int) bool {
return respStatus == http.StatusNotFound || respStatus == http.StatusMethodNotAllowed
},
// Optionally, log selected request/response headers explicitly.
LogRequestHeaders: []string{"Origin"},
LogResponseHeaders: []string{},
}))
// security headers
r.Use(func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// prevent tracking
w.Header().Add("Referrer-Policy", "same-origin")
// prevent iframe
w.Header().Add("X-Frame-Options", "deny")
// prevent bad content being parsed
w.Header().Add("X-Content-Type-Options", "nosniff")
w.Header().Add("X-Permitted-Cross-Domain-Policies", "none")
// content security, cors & co
w.Header().Add("Content-Security-Policy", fmt.Sprintf("default-src 'self' *.%s; object-src 'none';", cfg.Domain))
w.Header().Add("Access-Control-Allow-Origin", fmt.Sprintf("https://%s", cfg.Domain))
if !debug {
w.Header().Add("Access-Control-Max-Age", fmt.Sprintf("%d", 24*60*60))
}
next.ServeHTTP(w, r)
})
})
// context
r.Use(func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
next.ServeHTTP(w, r.WithContext(
setContext(r.Context(), cfg, debug, db, assets),
))
})
})
// login
r.Use(func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, pass, ok := r.BasicAuth()
ctx := r.Context()
if ok {
cfg := ctx.Value(configKey).(*Config)
passHash := sha256.Sum256([]byte(pass))
rightPassHash := sha256.Sum256([]byte(cfg.AdminPassword))
ok = subtle.ConstantTimeCompare(passHash[:], rightPassHash[:]) == 1
}
ctx = context.WithValue(ctx, loginKey, ok)
next.ServeHTTP(w, r.WithContext(ctx))
})
})
return r
}
// httpEmbedFS is an implementation of fs.FS, fs.ReadDirFS and fs.ReadFileFS helping to manage embed.FS for http server
type httpEmbedFS struct {
embed.FS
prefix string
}
func (h *httpEmbedFS) Open(name string) (fs.File, error) {
return h.FS.Open(h.prefix + "/" + name)
}
func (h *httpEmbedFS) ReadFile(name string) ([]byte, error) {
return h.FS.ReadFile(h.prefix + "/" + name)
}
func (h *httpEmbedFS) ReadDir(name string) ([]fs.DirEntry, error) {
return h.FS.ReadDir(h.prefix + "/" + name)
}
// UsableEmbedFS converts embed.FS into usable fs.FS by Golatt
//
// folder may not finish or start with a slash (/)
func UsableEmbedFS(folder string, em embed.FS) fs.FS {
return &httpEmbedFS{
prefix: folder,
FS: em,
}
}
func HandleStaticFiles(r *chi.Mux, path string, root fs.FS) {
if path != "/" && path[len(path)-1] != '/' {
r.Get(path, http.RedirectHandler(path+"/", 301).ServeHTTP)
path += "/"
}
path += "*"
r.Get(path, func(w http.ResponseWriter, req *http.Request) {
ctx := chi.RouteContext(req.Context())
pathPrefix := strings.TrimSuffix(ctx.RoutePattern(), "/*")
if pathPrefix+"/" == req.URL.Path {
r.NotFoundHandler().ServeHTTP(w, req)
return
}
http.StripPrefix(pathPrefix, http.FileServerFS(root)).ServeHTTP(w, req)
})
}
func UpdateStats(r *http.Request) {
ctx := r.Context()
cfg := ctx.Value(configKey).(*Config)
debug := ctx.Value(debugKey).(bool)
db := ctx.Value(storage.DBKey).(*sql.DB)
assets := ctx.Value(assetsFSKey).(fs.FS)
ctx2, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
if err := storage.UpdateStats(setContext(ctx2, cfg, debug, db, assets), r, cfg.Domain); err != nil {
slog.Error("updating stats", "error", err)
}
}
func setContext(ctx context.Context, cfg *Config, debug bool, db *sql.DB, assets fs.FS) context.Context {
ctx = context.WithValue(ctx, configKey, cfg)
ctx = context.WithValue(ctx, assetsFSKey, assets)
ctx = context.WithValue(ctx, debugKey, debug)
return context.WithValue(ctx, storage.DBKey, db)
}
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