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handlers.go

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package main

import (

"bytes"

"database/sql"

"errors"

"io"

"log"

"net"

"net/http"

"net/netip"

"path"

"strconv"

"time"

"github.com/go-chi/chi/v5"

"github.com/go-chi/chi/v5/middleware"

"golang.org/x/time/rate"

)

func (app *App) GetIndex(w http.ResponseWriter, _ *http.Request) {

document := Doc(

Ela("html", []Attr{{"lang", "en"}},

El("head",

Sela("meta", []Attr{{"charset", "utf-8"}}),

Sela("meta", []Attr{{"name", "viewport"}, {"content", "width=device-width, initial-scale=1"}}),

Sela("meta", []Attr{{"name", "description"}, {"content", "Anonymously share code snippets."}}),

El("title", "Paste"),

Sela("link", []Attr{{"rel", "stylesheet"}, {"href", "/css/toastify.min.css"}}),

Sela("link", []Attr{{"rel", "stylesheet"}, {"href", "/css/style.css"}}),

Ela("script", []Attr{{"src", "/js/toastify.min.js"}}),

Ela("script", []Attr{{"src", "/js/index.js"}, {"defer", ""}}),

),

El("body",

Ela("nav", []Attr{{"id", "nav"}},

El("div",

Ela("h1", []Attr{{"id", "title"}},

Ela("a", []Attr{{"href", "/"}}, "Paste"),

),

),

El("div",

Ela("button", []Attr{{"id", "save"}}, "Save"),

),

),

Ela("textarea", []Attr{

{"id", "content"},

{"name", "content"},

{"placeholder", "Enter text here..."},

{"wrap", "off"},

{"autofocus", ""},

}),

),

),

)

app.SendHtml(w, document)

}

func (app *App) PostSave() http.HandlerFunc {

limiter := NewAddrRateLimiter(rate.Every(5*time.Second), 10)

return func(w http.ResponseWriter, r *http.Request) {

r.Body = http.MaxBytesReader(w, r.Body, 512*1024)

data, err := io.ReadAll(r.Body)

if err != nil {

if errors.As(err, new(*http.MaxBytesError)) {

app.SendApiError(w, r, http.StatusRequestEntityTooLarge, "Your paste is too large.")

} else {

app.SendApiError(w, r, http.StatusBadRequest, "Something went wrong. Please try again.")

}

return

}

if len(data) == 0 {

app.SendApiError(w, r, http.StatusBadRequest, "Please enter something to save.")

return

}

addr := netip.MustParseAddr(r.RemoteAddr)

if !limiter.Allow(addr) {

app.SendApiError(w, r, http.StatusTooManyRequests, "You have been rate limited.")

return

}

id, err := GenerateId()

if err != nil {

app.HandleApiError(w, r, err)

return

}

milli := time.Now().UTC().UnixMilli()

countryCode := r.Header.Get("CF-IPCountry")

_, err = app.db.Exec("INSERT INTO pastes (id, created_at, country_code, content) VALUES ($1, $2, $3, $4)", id, milli, countryCode, data)

if err != nil {

app.HandleApiError(w, r, err)

return

}

type Response struct {

Id string `json:"id"`

}

app.SendJson(w, r, http.StatusOK, Response{Id: id})

}

}

func (app *App) GetPaste(w http.ResponseWriter, r *http.Request) {

id := chi.URLParam(r, "id")

row := app.db.QueryRow("SELECT created_at, content FROM pastes WHERE id = $1", id)

var createdAt int64

var content []byte

if err := row.Scan(&createdAt, &content); err != nil {

if errors.Is(err, sql.ErrNoRows) {

app.NotFound(w, r)

} else {

app.HandleError(w, r, err)

}

return

}

if err := app.IncrementViews(id); err != nil {

app.HandleError(w, r, err)

return

}

createdAtTime := time.UnixMilli(createdAt).UTC().Round(time.Second)

createdAtAgo := TimeAgo(createdAtTime)

createdAtRfc := createdAtTime.Format(time.RFC3339)

lines := bytes.Count(content, []byte("\n")) + 1

document := Doc(

Ela("html", []Attr{{"lang", "en"}},

El("head",

Sela("meta", []Attr{{"charset", "utf-8"}}),

Sela("meta", []Attr{{"name", "viewport"}, {"content", "width=device-width, initial-scale=1"}}),

El("title", "Paste"),

Sela("link", []Attr{

{"rel", "stylesheet"},

{"href", "/css/vs.min.css"},

{"media", "(prefers-color-scheme: light), (prefers-color-scheme: no-preference)"},

}),

Sela("link", []Attr{

{"rel", "stylesheet"},

{"href", "/css/vs2015.min.css"},

{"media", "(prefers-color-scheme: dark)"},

}),

Sela("link", []Attr{{"rel", "stylesheet"}, {"href", "/css/style.css"}}),

Ela("script", []Attr{{"src", "/js/highlight.min.js"}}),

Ela("script", []Attr{{"src", "/js/view.js"}, {"defer", ""}}),

),

El("body",

Ela("nav", []Attr{{"id", "nav"}},

El("div",

Ela("h1", []Attr{{"id", "title"}},

Ela("a", []Attr{{"href", "/"}}, "Paste"),

),

),

Ela("div", []Attr{{"id", "metadata"}},

Ela("a", []Attr{{"id", "new"}, {"href", "/"}}, "New"),

Ela("a", []Attr{{"id", "raw"}, {"href", "/raw/" + id}}, "Raw"),

Ela("time", []Attr{

{"id", "created-at"},

{"datetime", createdAtRfc},

{"title", createdAtRfc},

}, createdAtAgo),

" - ",

strconv.Itoa(lines)+" line", IfElse(lines == 1, "", "s"),

),

),

Ela("pre", []Attr{{"id", "content"}}, Esc(ToString(content))),

),

),

)

app.SendHtml(w, document)

}

func (app *App) GetRawPaste(w http.ResponseWriter, r *http.Request) {

id := chi.URLParam(r, "id")

row := app.db.QueryRow("SELECT content FROM pastes WHERE id = $1", id)

var content []byte

if err := row.Scan(&content); err != nil {

if errors.Is(err, sql.ErrNoRows) {

app.NotFound(w, r)

} else {

app.HandleError(w, r, err)

}

return

}

if err := app.IncrementViews(id); err != nil {

app.HandleError(w, r, err)

return

}

app.SendText(w, content)

}

func (app *App) IncrementViews(id string) error {

_, err := app.db.Exec("UPDATE pastes SET views = views + 1, last_view = $1 WHERE id = $2", time.Now().UTC().UnixMilli(), id)

return err

}

func (app *App) ServeAssets(w http.ResponseWriter, r *http.Request) {

file, err := assets.Open(path.Join("assets", r.URL.Path))

if err != nil {

app.NotFound(w, r)

return

}

info, err := file.Stat()

if err != nil || info.IsDir() {

app.NotFound(w, r)

return

}

// Tell Cloudflare to cache assets for 7 days

w.Header().Set("Cloudflare-CDN-Cache-Control", "max-age=604800")

// Tell browsers to cache assets for 5 minutes

w.Header().Set("Cache-Control", "max-age=300")

http.ServeContent(w, r, info.Name(), info.ModTime(), file.(io.ReadSeeker))

}

func (app *App) NotFound(w http.ResponseWriter, _ *http.Request) {

http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)

}

func (app *App) MethodNotAllowed(w http.ResponseWriter, _ *http.Request) {

http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)

}

func (app *App) RealIP(next http.Handler) http.Handler {

return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

if ip := r.Header.Get("CF-Connecting-IP"); ip != "" {

r.RemoteAddr = ip

} else {

r.RemoteAddr, _, _ = net.SplitHostPort(r.RemoteAddr)

}

next.ServeHTTP(w, r)

})

}

func (app *App) LogRequest(next http.Handler) http.Handler {

return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

now := time.Now()

ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)

defer func() {

log.Printf("%s %d %dB %s %s %s %s %s\n",

time.Since(now), ww.Status(), ww.BytesWritten(), r.Header.Get("CF-IPCountry"), r.RemoteAddr, r.Method, r.RequestURI, r.UserAgent())

}()

next.ServeHTTP(ww, r)

})

}

func (app *App) RateLimit(next http.Handler) http.Handler {

limiter := NewAddrRateLimiter(rate.Limit(5), 50)

return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

addr := netip.MustParseAddr(r.RemoteAddr)

if !limiter.Allow(addr) {

http.Error(w, http.StatusText(http.StatusTooManyRequests), http.StatusTooManyRequests)

return

}

next.ServeHTTP(w, r)

})

}