git.giacomolli.uk - onechat/blob - botapi_test.go

   1 package main
   2
   3 import (
   4         "context"
   5         "encoding/json"
   6         "fmt"
   7         "io"
   8         "net/http"
   9         "net/http/httptest"
  10         "strings"
  11         "sync"
  12         "testing"
  13         "time"
  14
  15         "github.com/stretchr/testify/require"
  16 )
  17
  18 const (
  19         // testBotToken is the bot token of the tests. It has the form of a real
  20         // token.
  21         testBotToken = "123456:TEST-secret_token"
  22
  23         // testOwner is the user ID of the owner of the test bot.
  24         testOwner = 4242
  25 )
  26
  27 func TestGetUpdatesAsksForMessagesFromTheOffset(t *testing.T) {
  28         server := newFakeBot(t)
  29         server.Add(botUpdate{
  30                 UpdateID: 7,
  31                 Message:  ownerMessage("hello"),
  32         })
  33
  34         updates, err := newBotAPI(server.URL, testBotToken).GetUpdates(t.Context(), 7)
  35         require.NoError(t, err)
  36         require.Len(t, updates, 1)
  37         require.Equal(t, int64(7), updates[0].UpdateID)
  38         require.Equal(t, "hello", updates[0].Message.Text)
  39
  40         call := server.Calls()[0]
  41         require.Equal(t, "getUpdates", call.method)
  42         require.Equal(t, map[string]any{
  43                 "offset":          float64(7),
  44                 "timeout":         float64(pollSeconds),
  45                 "allowed_updates": []any{"message"},
  46         }, call.params)
  47 }
  48
  49 func TestSendMessageSendsPlainText(t *testing.T) {
  50         server := newFakeBot(t)
  51         err := newBotAPI(server.URL, testBotToken).SendMessage(t.Context(), testOwner, "*not bold*", nil)
  52         require.NoError(t, err)
  53
  54         require.Equal(t, map[string]any{
  55                 "chat_id": float64(testOwner),
  56                 "text":    "*not bold*",
  57         }, server.Calls()[0].params)
  58 }
  59
  60 func TestSendMessageSendsTheEntities(t *testing.T) {
  61         server := newFakeBot(t)
  62         err := newBotAPI(server.URL, testBotToken).SendMessage(t.Context(), testOwner, "a link", []botEntity{
  63                 {
  64                         Type:   "text_link",
  65                         Offset: 2,
  66                         Length: 4,
  67                         URL:    "https://example.com",
  68                 },
  69         })
  70         require.NoError(t, err)
  71
  72         require.Equal(t, []any{
  73                 map[string]any{
  74                         "type":   "text_link",
  75                         "offset": float64(2),
  76                         "length": float64(4),
  77                         "url":    "https://example.com",
  78                 },
  79         }, server.Calls()[0].params["entities"])
  80 }
  81
  82 func TestSendRichMessageSendsTheMarkdownUnchanged(t *testing.T) {
  83         server := newFakeBot(t)
  84         markdown := "| a | b |\n|---|---|\n| **1** | `2` |"
  85         err := newBotAPI(server.URL, testBotToken).SendRichMessage(t.Context(), testOwner, markdown)
  86         require.NoError(t, err)
  87
  88         call := server.Calls()[0]
  89         require.Equal(t, "sendRichMessage", call.method)
  90         require.Equal(t, map[string]any{
  91                 "chat_id": float64(testOwner),
  92                 "rich_message": map[string]any{
  93                         "markdown": markdown,
  94                 },
  95         }, call.params)
  96 }
  97
  98 func TestSendCallsTimeOutOnAStalledConnection(t *testing.T) {
  99         testCases := []struct {
 100                 method string
 101                 send   func(ctx context.Context, api *botAPI) error
 102         }{
 103                 {
 104                         method: "sendMessage",
 105                         send: func(ctx context.Context, api *botAPI) error {
 106                                 return api.SendMessage(ctx, testOwner, "hi", nil)
 107                         },
 108                 },
 109                 {
 110                         method: "sendRichMessage",
 111                         send: func(ctx context.Context, api *botAPI) error {
 112                                 return api.SendRichMessage(ctx, testOwner, "hi")
 113                         },
 114                 },
 115         }
 116
 117         for _, tc := range testCases {
 118                 t.Run(tc.method, func(t *testing.T) {
 119                         server := newFakeBot(t)
 120                         server.stall = func(call fakeBotCall) bool {
 121                                 return call.method == tc.method
 122                         }
 123
 124                         api := newBotAPI(server.URL, testBotToken)
 125                         api.sendTimeout = 50 * time.Millisecond
 126                         start := time.Now()
 127                         err := tc.send(t.Context(), api)
 128                         require.ErrorIs(t, err, errBotNetwork)
 129                         require.Less(t, time.Since(start), 5*time.Second)
 130                         require.NotContains(t, err.Error(), testBotToken)
 131                         require.NotContains(t, err.Error(), server.URL)
 132
 133                         retry, _ := retryable(err)
 134                         require.True(t, retry)
 135
 136                         api.sendTimeout = time.Hour
 137                         ctx, cancel := context.WithCancel(t.Context())
 138                         time.AfterFunc(50*time.Millisecond, cancel)
 139                         start = time.Now()
 140                         err = tc.send(ctx, api)
 141                         require.Error(t, err)
 142                         require.Less(t, time.Since(start), 5*time.Second)
 143                 })
 144         }
 145 }
 146
 147 func TestBotErrorsDoNotHoldTheToken(t *testing.T) {
 148         testCases := []struct {
 149                 name      string
 150                 reply     func(w http.ResponseWriter)
 151                 retry     bool
 152                 wait      time.Duration
 153                 rejected  bool
 154                 errorText string
 155         }{
 156                 {
 157                         name: "refused connection is retried",
 158                         reply: func(w http.ResponseWriter) {
 159                                 conn, _, err := http.NewResponseController(w).Hijack()
 160                                 if err == nil {
 161                                         _ = conn.Close()
 162                                 }
 163                         },
 164                         retry:     true,
 165                         errorText: "no valid answer",
 166                 },
 167                 {
 168                         name: "rate limit waits as asked",
 169                         reply: func(w http.ResponseWriter) {
 170                                 w.WriteHeader(http.StatusTooManyRequests)
 171                                 _, _ = io.WriteString(w, `{"ok":false,"error_code":429,"description":"Too Many Requests: retry after 3","parameters":{"retry_after":3}}`)
 172                         },
 173                         retry:     true,
 174                         wait:      3 * time.Second,
 175                         errorText: "answered 429",
 176                 },
 177                 {
 178                         name: "server error page is retried",
 179                         reply: func(w http.ResponseWriter) {
 180                                 w.WriteHeader(http.StatusBadGateway)
 181                                 _, _ = io.WriteString(w, "<html>bad gateway</html>")
 182                         },
 183                         retry:     true,
 184                         errorText: "answered 502: Bad Gateway",
 185                 },
 186                 {
 187                         name: "token echoed in a description is hidden",
 188                         reply: func(w http.ResponseWriter) {
 189                                 w.WriteHeader(http.StatusUnauthorized)
 190                                 _, _ = io.WriteString(w, `{"ok":false,"error_code":401,"description":"Unauthorized: bot`+testBotToken+`"}`)
 191                         },
 192                         retry:     false,
 193                         errorText: "Unauthorized: botTOKEN",
 194                 },
 195                 {
 196                         name: "bad request is a refusal",
 197                         reply: func(w http.ResponseWriter) {
 198                                 w.WriteHeader(http.StatusBadRequest)
 199                                 _, _ = io.WriteString(w, `{"ok":false,"error_code":400,"description":"Bad Request: can't parse"}`)
 200                         },
 201                         retry:     false,
 202                         rejected:  true,
 203                         errorText: "answered 400: Bad Request: can't parse",
 204                 },
 205                 {
 206                         name: "unknown method is a refusal",
 207                         reply: func(w http.ResponseWriter) {
 208                                 w.WriteHeader(http.StatusNotFound)
 209                                 _, _ = io.WriteString(w, `{"ok":false,"error_code":404,"description":"Not Found"}`)
 210                         },
 211                         retry:     false,
 212                         rejected:  true,
 213                         errorText: "answered 404: Not Found",
 214                 },
 215                 {
 216                         name: "not found page of a proxy is not a refusal",
 217                         reply: func(w http.ResponseWriter) {
 218                                 w.WriteHeader(http.StatusNotFound)
 219                                 _, _ = io.WriteString(w, "<html>not found</html>")
 220                         },
 221                         retry:     false,
 222                         errorText: "answered 404: Not Found",
 223                 },
 224                 {
 225                         name: "broken answer is retried",
 226                         reply: func(w http.ResponseWriter) {
 227                                 _, _ = io.WriteString(w, `{"ok":`)
 228                         },
 229                         retry:     true,
 230                         errorText: "decode answer",
 231                 },
 232         }
 233
 234         for _, tc := range testCases {
 235                 t.Run(tc.name, func(t *testing.T) {
 236                         server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 237                                 tc.reply(w)
 238                         }))
 239                         t.Cleanup(server.Close)
 240
 241                         err := newBotAPI(server.URL, testBotToken).SendMessage(t.Context(), testOwner, "hi", nil)
 242                         require.ErrorContains(t, err, tc.errorText)
 243                         require.NotContains(t, err.Error(), testBotToken)
 244                         require.NotContains(t, err.Error(), server.URL)
 245
 246                         retry, wait := retryable(err)
 247                         require.Equal(t, tc.retry, retry)
 248                         require.Equal(t, tc.wait, wait)
 249                         require.Equal(t, tc.rejected, rejected(err))
 250                 })
 251         }
 252
 253         server := httptest.NewServer(http.NotFoundHandler())
 254         server.Close()
 255
 256         _, err := newBotAPI(server.URL, testBotToken).GetUpdates(t.Context(), 0)
 257         require.ErrorIs(t, err, errBotNetwork)
 258         require.NotContains(t, err.Error(), testBotToken)
 259 }
 260
 261 // fakeBot is a fake Bot API server for testBotToken. getUpdates returns the
 262 // added updates from the offset on, or waits a short time when there are none.
 263 // The other methods succeed, unless fail gives an error answer for a call. An
 264 // answer with HTTP 429 asks for a wait of one second. When stall is true for a
 265 // call, the call gets no answer until the client gives it up or the test ends.
 266 // Fail and stall run with the mutex held.
 267 type fakeBot struct {
 268         *httptest.Server
 269
 270         mutex   sync.Mutex
 271         updates []botUpdate
 272         calls   []fakeBotCall
 273         fail    func(call fakeBotCall) (int, string)
 274         stall   func(call fakeBotCall) bool
 275         added   chan struct{}
 276         stopped chan struct{}
 277 }
 278
 279 // fakeBotCall is one call of the fake Bot API. OK tells if the call got a
 280 // success answer.
 281 type fakeBotCall struct {
 282         method string
 283         params map[string]any
 284         ok     bool
 285 }
 286
 287 // newFakeBot starts a fake Bot API server that stops at the end of the test.
 288 func newFakeBot(t *testing.T) *fakeBot {
 289         t.Helper()
 290
 291         f := &fakeBot{
 292                 added:   make(chan struct{}, 1),
 293                 stopped: make(chan struct{}),
 294         }
 295
 296         f.Server = httptest.NewServer(http.HandlerFunc(f.serve))
 297         t.Cleanup(f.Close)
 298         t.Cleanup(func() {
 299                 close(f.stopped)
 300         })
 301
 302         return f
 303 }
 304
 305 // Add makes update available to getUpdates.
 306 func (f *fakeBot) Add(update botUpdate) {
 307         f.mutex.Lock()
 308         f.updates = append(f.updates, update)
 309         f.mutex.Unlock()
 310
 311         select {
 312         case f.added <- struct{}{}:
 313         default:
 314         }
 315 }
 316
 317 // Calls returns the calls so far.
 318 func (f *fakeBot) Calls() []fakeBotCall {
 319         f.mutex.Lock()
 320         defer f.mutex.Unlock()
 321
 322         return append([]fakeBotCall(nil), f.calls...)
 323 }
 324
 325 // Sent returns the texts of the sendMessage calls that succeeded.
 326 func (f *fakeBot) Sent() []string {
 327         var texts []string
 328         for _, call := range f.Calls() {
 329                 if call.method == "sendMessage" && call.ok {
 330                         texts = append(texts, call.params["text"].(string))
 331                 }
 332         }
 333
 334         return texts
 335 }
 336
 337 func (f *fakeBot) serve(w http.ResponseWriter, r *http.Request) {
 338         method, found := strings.CutPrefix(r.URL.Path, "/bot"+testBotToken+"/")
 339         if !found {
 340                 http.Error(w, `{"ok":false,"error_code":404,"description":"Not Found"}`, http.StatusNotFound)
 341                 return
 342         }
 343
 344         var params map[string]any
 345         err := json.NewDecoder(r.Body).Decode(&params)
 346         if err != nil {
 347                 http.Error(w, err.Error(), http.StatusBadRequest)
 348                 return
 349         }
 350
 351         call := fakeBotCall{
 352                 method: method,
 353                 params: params,
 354         }
 355
 356         f.mutex.Lock()
 357         status, description := 0, ""
 358         if f.fail != nil {
 359                 status, description = f.fail(call)
 360         }
 361
 362         stall := f.stall != nil && f.stall(call)
 363         f.mutex.Unlock()
 364
 365         if stall {
 366                 f.record(call)
 367                 select {
 368                 case <-r.Context().Done():
 369                 case <-f.stopped:
 370                 }
 371
 372                 return
 373         }
 374
 375         if status != 0 {
 376                 f.record(call)
 377                 w.WriteHeader(status)
 378                 wait := 0
 379                 if status == http.StatusTooManyRequests {
 380                         wait = 1
 381                 }
 382
 383                 _, _ = fmt.Fprintf(w, `{"ok":false,"error_code":%d,"description":%q,"parameters":{"retry_after":%d}}`, status, description, wait)
 384
 385                 return
 386         }
 387
 388         call.ok = true
 389         f.record(call)
 390         if method != "getUpdates" {
 391                 _, _ = io.WriteString(w, `{"ok":true,"result":true}`)
 392                 return
 393         }
 394
 395         offset := int64(params["offset"].(float64))
 396         updates := f.from(offset)
 397         if len(updates) == 0 {
 398                 select {
 399                 case <-f.added:
 400                 case <-time.After(50 * time.Millisecond):
 401                 case <-r.Context().Done():
 402                 }
 403
 404                 updates = f.from(offset)
 405         }
 406
 407         _ = json.NewEncoder(w).Encode(map[string]any{
 408                 "ok":     true,
 409                 "result": updates,
 410         })
 411 }
 412
 413 // record keeps call.
 414 func (f *fakeBot) record(call fakeBotCall) {
 415         f.mutex.Lock()
 416         defer f.mutex.Unlock()
 417
 418         f.calls = append(f.calls, call)
 419 }
 420
 421 // from returns the updates from offset on, and forgets the ones before it, as
 422 // Telegram does.
 423 func (f *fakeBot) from(offset int64) []botUpdate {
 424         f.mutex.Lock()
 425         defer f.mutex.Unlock()
 426
 427         var updates []botUpdate
 428         kept := f.updates[:0]
 429         for _, update := range f.updates {
 430                 if update.UpdateID >= offset {
 431                         updates = append(updates, update)
 432                         kept = append(kept, update)
 433                 }
 434         }
 435
 436         f.updates = kept
 437
 438         return updates
 439 }
 440
 441 // ownerMessage returns a text message of the owner in the private chat.
 442 func ownerMessage(text string) *botMessage {
 443         return &botMessage{
 444                 Chat: botChat{
 445                         ID:   testOwner,
 446                         Type: "private",
 447                 },
 448                 From: &botUser{
 449                         ID: testOwner,
 450                 },
 451                 Text: text,
 452         }
 453 }