-
Notifications
You must be signed in to change notification settings - Fork 0
/
urlresolver_test.go
785 lines (721 loc) · 22 KB
/
urlresolver_test.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
//nolint:errcheck
package urlresolver
import (
"bytes"
"compress/gzip"
"context"
"encoding/base64"
"errors"
"fmt"
"io"
"net/http"
"net/http/httptest"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/stretchr/testify/assert"
"golang.org/x/text/encoding/charmap"
)
type titleTestCase struct {
body []byte
expectedTitle string
}
func TestFindTitle(t *testing.T) {
t.Parallel()
maxBodySize := 1024 // simulate maxBodySize of 1kb for testing purposes
testCases := loadTitleTestCases(t, maxBodySize)
for name, tc := range testCases {
tc := tc
t.Run(name, func(t *testing.T) {
title := findTitle(tc.body)
if title != tc.expectedTitle {
t.Errorf("expected title %q, got %q", tc.expectedTitle, title)
}
})
}
}
func TestResolver(t *testing.T) {
t.Parallel()
testCases := []struct {
name string
handlerFunc http.HandlerFunc
givenURL string
timeout time.Duration
wantResult Result
wantErr error
}{
{
name: "basic test",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html><head><title>page title</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "page title",
},
},
{
name: "basic redirect test",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/a" {
http.Redirect(w, r, "/b", http.StatusFound)
return
}
w.Write([]byte(`<html><head><title>page title</title></head></html>`))
},
givenURL: "/a",
wantResult: Result{
ResolvedURL: "/b",
Title: "page title",
IntermediateURLs: []string{"/a"},
},
},
{
name: "max redirect test",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
parts := strings.Split(r.URL.Path, "/")
n, _ := strconv.Atoi(parts[1])
http.Redirect(w, r, fmt.Sprintf("/%d", n+1), http.StatusFound)
},
givenURL: "/0",
wantResult: Result{
ResolvedURL: fmt.Sprintf("/%d", maxRedirects-1),
Title: "",
IntermediateURLs: []string{"/0", "/1", "/2", "/3", "/4"},
},
},
{
name: "cookies are respected",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
var (
cookieName = "foo"
cookieValue = "bar"
)
c, err := r.Cookie(cookieName)
if err != nil {
expire := time.Now().Add(10 * time.Minute)
http.SetCookie(w, &http.Cookie{
Name: cookieName,
Value: cookieValue,
Path: "/",
Expires: expire,
MaxAge: 90000,
})
http.Redirect(w, r, "/b", http.StatusFound)
return
}
if c.Value != cookieValue {
t.Errorf("unexpected cookie value: %#v", c.Value)
}
w.Write([]byte(`<html><head><title>🍪</title></head></html>`))
},
givenURL: "/a",
wantResult: Result{
ResolvedURL: "/b",
Title: "🍪",
IntermediateURLs: []string{"/a"},
},
},
{
// https://github.com/mccutchen/thresholderbot/pull/63
name: "forbes interstitial detection",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/start" {
http.Redirect(w, r, "/forbes", http.StatusFound)
return
}
if r.URL.Path == "/forbes" {
http.Redirect(w, r, "https://www.forbes.com/forbes/welcome/", http.StatusFound)
return
}
},
givenURL: "/start",
wantResult: Result{
ResolvedURL: "/forbes",
Title: "",
IntermediateURLs: []string{"/start"},
},
},
{
name: "instagram auth detection",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/start" {
http.Redirect(w, r, "/instagram", http.StatusFound)
return
}
if r.URL.Path == "/instagram" {
http.Redirect(w, r, "https://www.instagram.com/accounts/login/", http.StatusFound)
return
}
},
givenURL: "/start",
wantResult: Result{
ResolvedURL: "/instagram",
Title: "",
IntermediateURLs: []string{"/start"},
},
},
{
name: "bloomberg bot detection",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/start" {
http.Redirect(w, r, "/bloomberg", http.StatusFound)
return
}
if r.URL.Path == "/bloomberg" {
http.Redirect(w, r, "https://www.bloomberg.com/tosv2.html?url=foo", http.StatusFound)
return
}
},
givenURL: "/start",
wantResult: Result{
ResolvedURL: "/bloomberg",
Title: "",
IntermediateURLs: []string{"/start"},
},
},
{
name: "timeout waiting on response",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
select {
case <-time.After(10 * time.Second):
w.Write([]byte(`<html><head><title>forbes, yo</title></head></html>`))
case <-r.Context().Done():
return
}
},
givenURL: "/foo",
timeout: 10 * time.Millisecond,
wantResult: Result{
ResolvedURL: "/foo",
},
wantErr: context.DeadlineExceeded,
},
{
name: "request error after redirect still resolves URL",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/long-url" {
http.Redirect(w, r, "/short-url?"+r.URL.RawQuery, http.StatusFound)
return
}
select {
case <-time.After(10 * time.Second):
w.Write([]byte(`<html><head><title>title</title></head></html>`))
case <-r.Context().Done():
return
}
},
givenURL: "/long-url?zzz=zzz&mmm=mmm&AAA=AAA&utm_campaign=spam",
timeout: 50 * time.Millisecond,
wantResult: Result{
ResolvedURL: "/short-url?AAA=AAA&mmm=mmm&zzz=zzz", // note, we still got a resolved (and canonicalized) URL despite the error
Title: "",
IntermediateURLs: []string{
// params sorted and utm_campaign dropped because each hop
// is canonicalized
"/long-url?AAA=AAA&mmm=mmm&zzz=zzz",
},
},
wantErr: context.DeadlineExceeded,
},
{
name: "timeout reading body still resolves URL",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
// first request redirects
if r.URL.Path == "/foo" {
http.Redirect(w, r, "/bar", http.StatusFound)
return
}
// second request should time out before the body can be read
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
select {
case <-time.After(10 * time.Second):
w.Write([]byte(`<head><title>forbes, yo</title></head></html>`))
case <-r.Context().Done():
return
}
},
givenURL: "/foo",
timeout: 20 * time.Millisecond,
wantResult: Result{
ResolvedURL: "/bar", // note, we still got a usefully resolved URL, despite the expected error
Title: "",
IntermediateURLs: []string{"/foo"},
},
wantErr: context.DeadlineExceeded,
},
{
name: "normal html content type parsed",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Write([]byte(`<html><head><title>page title</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "page title",
},
},
{
name: "weird html content type parsed",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/html")
w.Write([]byte(`<html><head><title>page title</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "page title",
},
},
{
name: "html content type w/ encoding parsed",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Write([]byte(`<html><head><title>page title</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "page title",
},
},
{
name: "non-html content types ignored",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.Write([]byte(`<html><head><title>page title</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "",
},
},
{
name: "non-utf8 charset in content type header",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=iso-8859-1")
w2 := charmap.ISO8859_1.NewEncoder().Writer(w)
w2.Write([]byte(`<html><head><title>Iñtërnâtiônàlizætiøn</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "non-utf8 charset in meta charset tag",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w2 := charmap.ISO8859_1.NewEncoder().Writer(w)
w2.Write([]byte(`<html><head><meta charset="iso-8859-1"><title>Iñtërnâtiônàlizætiøn</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "non-utf8 charset in meta http-equiv tag",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w2 := charmap.ISO8859_1.NewEncoder().Writer(w)
w2.Write([]byte(`<html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Iñtërnâtiônàlizætiøn</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "non-utf8 charset autodetected",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w2 := charmap.ISO8859_1.NewEncoder().Writer(w)
w2.Write([]byte(`<html><head><title>Iñtërnâtiônàlizætiøn</title></head></html>`))
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "gzipped utf-8",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Header().Set("Content-Encoding", "gzip")
w2 := gzip.NewWriter(w)
w2.Write([]byte(`<html><head><title>Iñtërnâtiônàlizætiøn</title></head></html>`))
w2.Close()
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "gzipped non-utf-8",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Header().Set("Content-Encoding", "gzip")
w2 := gzip.NewWriter(w)
w3 := charmap.ISO8859_1.NewEncoder().Writer(w2)
w3.Write([]byte(`<html><head><title>Iñtërnâtiônàlizætiøn</title></head></html>`))
w2.Close()
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "gzipped larger than max body size",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Header().Set("Content-Encoding", "gzip")
w2 := gzip.NewWriter(w)
defer w2.Close()
body := fmt.Sprintf("<html><head><title>Iñtërnâtiônàlizætiøn</title></head><body>%s</body></html>", strings.Repeat("*", maxBodySize*2))
mustWriteAll(t, w2, body)
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "Iñtërnâtiônàlizætiøn",
},
},
{
name: "invalid gzip stream",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Header().Set("Content-Encoding", "gzip")
w.Header().Set("Content-Encoding", "gzip")
mustWriteAll(t, w, "<title>definitely not gzip</title>")
},
givenURL: "/foo",
wantErr: errors.New("error reading response: gzip: invalid header"),
wantResult: Result{
ResolvedURL: "/foo",
Title: "",
},
},
{
name: "no redirects",
handlerFunc: func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
mustWriteAll(t, w, "<title>OK</title>")
},
givenURL: "/foo",
wantResult: Result{
ResolvedURL: "/foo",
Title: "OK",
},
},
}
for _, tc := range testCases {
tc := tc
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
srv := httptest.NewServer(tc.handlerFunc)
defer srv.Close()
resolver := New(newSafeTestTransport(t), 0)
timeout := tc.timeout
if timeout == 0 {
timeout = 1 * time.Second
}
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
givenURL := renderURL(srv.URL, tc.givenURL)
if tc.wantResult.ResolvedURL != "" {
tc.wantResult.ResolvedURL = renderURL(srv.URL, tc.wantResult.ResolvedURL)
}
result, err := resolver.Resolve(ctx, givenURL)
assertErrorsMatch(t, tc.wantErr, err)
// fixup relative intermediate URLs to include test server
for idx, hop := range tc.wantResult.IntermediateURLs {
tc.wantResult.IntermediateURLs[idx] = renderURL(srv.URL, hop)
}
assert.Equal(t, tc.wantResult, result)
})
}
t.Run("multiple requests for the same URL are coalesced into one", func(t *testing.T) {
t.Parallel()
var counter int64
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
atomic.AddInt64(&counter, 1)
<-time.After(250 * time.Millisecond)
w.Header().Set("Content-Type", "text/html")
w.Write([]byte(`<html><head><title>title</title></head></html>`))
}))
defer srv.Close()
wantResult := Result{
Title: "title",
ResolvedURL: srv.URL,
Coalesced: true,
}
resolver := New(newSafeTestTransport(t), 0)
var wg sync.WaitGroup
for i := 0; i < 4; i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
// note: URL query param varies, but it's a param that will be
// stripped by initial canonicalization before the singleflight
// check happens, so all requests should be coalesced.
url := fmt.Sprintf("%s?utm_campaign=%d", srv.URL, i)
result, err := resolver.Resolve(context.Background(), url)
assert.NoError(t, err)
assert.Equal(t, wantResult, result)
}(i)
}
wg.Wait()
assert.Equal(t, int64(1), counter, "expected all requests coalesced into 1")
})
// an invalid URL is the only way to get an error out of Resolve
t.Run("invalid URL error", func(t *testing.T) {
t.Parallel()
resolver := New(newSafeTestTransport(t), 0)
result, err := resolver.Resolve(context.Background(), "%%")
assertErrorsMatch(t, errors.New("invalid URL escape"), err)
assert.Equal(t, Result{ResolvedURL: "%%"}, result)
})
}
func TestRedirectHops(t *testing.T) {
t.Parallel()
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/":
http.Redirect(w, r, "/a", http.StatusPermanentRedirect)
case "/a":
http.Redirect(w, r, "/b", http.StatusPermanentRedirect)
case "/b":
http.Redirect(w, r, "/c", http.StatusPermanentRedirect)
case "/c":
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte(`<title>Success</title>`))
}
}))
defer srv.Close()
resolver := New(newSafeTestTransport(t), 0)
result, err := resolver.Resolve(context.Background(), srv.URL)
assert.NoError(t, err)
assert.Equal(t, Result{
ResolvedURL: renderURL(srv.URL, "/c"),
Title: "Success",
IntermediateURLs: []string{
renderURL(srv.URL, ""),
renderURL(srv.URL, "/a"),
renderURL(srv.URL, "/b"),
},
}, result)
}
func TestSailthruHandling(t *testing.T) {
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// note that wrapped sailthru links are not canonicalized before they
// are fetched (so ?utm_campaign=foo comes through here)
assert.Equal(t, "/wrapped-target", r.URL.Path)
assert.Equal(t, "utm_campaign=foo", r.URL.RawQuery)
w.WriteHeader(http.StatusOK)
}))
defer srv.Close()
// construct a fake Sailthru tracking URL that wraps a URL pointing to our
// local test server.
var (
targetURL = srv.URL + "/wrapped-target?utm_campaign=foo"
encodedURL = base64.RawURLEncoding.EncodeToString([]byte(targetURL))
givenURL = fmt.Sprintf("https://link.example.com/click/00000000.0000/%s/0000", encodedURL)
)
wantResult := Result{
ResolvedURL: srv.URL + "/wrapped-target",
IntermediateURLs: []string{givenURL},
}
resolver := New(newSafeTestTransport(t), 0)
gotResult, err := resolver.Resolve(context.Background(), givenURL)
assert.NoError(t, err)
assert.Equal(t, wantResult, gotResult)
}
// assertErrorsMatch is a helper for comparing two error values, mostly to hide
// the awkwardness of comparing error strings necessitated by the kinds of
// network errors we're dealing with containing random IP addresses.
func assertErrorsMatch(t *testing.T, want, got error) {
t.Helper()
if want != nil {
if assert.Error(t, got) {
assert.Contains(t, got.Error(), want.Error())
}
} else {
assert.NoError(t, got, "got unexpected error")
}
}
func TestResolveTweets(t *testing.T) {
t.Parallel()
okFetcher := &testTweetFetcher{
fetch: func(ctx context.Context, tweetURL string) (tweetData, error) {
return tweetData{
URL: tweetURL,
Text: "tweet text",
}, nil
},
}
errFetcher := &testTweetFetcher{
fetch: func(ctx context.Context, tweetURL string) (tweetData, error) {
return tweetData{}, errors.New("twitter error")
},
}
// this transport will prevent Resolve from making real requests to
// Twitter, so that these tests may safely redirect to Twitter URLs without
// actually triggering external requsts.
twitterInterceptTransport := &testTransport{
roundTrip: func(r *http.Request) (*http.Response, error) {
if strings.Contains(r.URL.Host, "twitter.com") {
return &http.Response{
StatusCode: 200,
Request: r,
}, nil
}
return http.DefaultTransport.RoundTrip(r)
},
}
testCases := map[string]struct {
fullTweetURL string
tweetFetcher tweetFetcher
wantErr error
wantResult Result
}{
"ok": {
fullTweetURL: "https://twitter.com/username/status/1234/photos/1?foo=bar",
tweetFetcher: okFetcher,
wantResult: Result{
ResolvedURL: "https://twitter.com/username/status/1234", // note that full URL above was trimmed
Title: "tweet text",
IntermediateURLs: []string{""}, // will be rendered to match test server URL
},
},
"error fetching tweet": {
fullTweetURL: "https://twitter.com/username/status/1234/photos/1?foo=bar",
tweetFetcher: errFetcher,
wantErr: errors.New("twitter error"),
// despite expected error, we still want a partial result
wantResult: Result{
ResolvedURL: "https://twitter.com/username/status/1234", // note that full URL above was trimmed
Title: "",
IntermediateURLs: []string{""}, // will be rendered to match test server URL
},
},
}
for name, tc := range testCases {
tc := tc
t.Run(name, func(t *testing.T) {
t.Parallel()
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, tc.fullTweetURL, http.StatusFound)
}))
defer srv.Close()
resolver := New(twitterInterceptTransport, 0)
resolver.tweetFetcher = tc.tweetFetcher
result, err := resolver.Resolve(context.Background(), srv.URL)
assertErrorsMatch(t, tc.wantErr, err)
// fixup relative intermediate URLs to include test server
for idx, hop := range tc.wantResult.IntermediateURLs {
tc.wantResult.IntermediateURLs[idx] = renderURL(srv.URL, hop)
}
assert.Equal(t, tc.wantResult, result)
})
}
t.Run("short circuit when given twitter URL as input", func(t *testing.T) {
t.Parallel()
resolver := New(twitterInterceptTransport, 0)
resolver.tweetFetcher = okFetcher
result, err := resolver.Resolve(context.Background(), "https://twitter.com/username/status/1234/photos/1?foo=bar")
assert.NoError(t, err)
assert.Equal(t, Result{
ResolvedURL: "https://twitter.com/username/status/1234", // note that full URL above was trimmed
Title: "tweet text",
}, result)
})
}
type testTweetFetcher struct {
fetch func(context.Context, string) (tweetData, error)
}
func (f *testTweetFetcher) Fetch(ctx context.Context, tweetURL string) (tweetData, error) {
return f.fetch(ctx, tweetURL)
}
type testTransport struct {
roundTrip func(*http.Request) (*http.Response, error)
}
func (t *testTransport) RoundTrip(req *http.Request) (*http.Response, error) {
return t.roundTrip(req)
}
func newSafeTestTransport(t *testing.T) *testTransport {
return &testTransport{
roundTrip: func(r *http.Request) (*http.Response, error) {
if r.URL.Hostname() != "127.0.0.1" {
t.Fatalf("external request to %q forbidden in this test suite", r.URL)
}
return http.DefaultTransport.RoundTrip(r)
},
}
}
// renderURL takes a dynamic httptest.Server URL string src and an "expected"
// URL dst and ensures that dst is relative to the dynamic server URL.
func renderURL(src string, dst string) string {
srcURL, _ := url.Parse(src)
dstURL, _ := url.Parse(dst)
return srcURL.ResolveReference(dstURL).String()
}
func mustWriteAll(t *testing.T, dst io.Writer, s string) {
t.Helper()
nr, err := dst.Write([]byte(s))
if nr != len(s) {
t.Fatalf("expected to write %d bytes, wrote %d", len(s), nr)
}
if err != nil {
t.Fatalf("write error: %s", err)
}
}
func loadTitleTestCases(t *testing.T, maxBodySize int) map[string]titleTestCase {
t.Helper()
paths, err := filepath.Glob("./testdata/*.html")
if err != nil {
t.Fatalf("could not load test cases: %s", err)
}
testCases := make(map[string]titleTestCase, len(paths))
for _, p := range paths {
b, err := os.ReadFile(p)
if err != nil {
t.Fatalf("error reading file %s: %s", p, err)
}
testParts := bytes.Split(b, []byte("\n###\n"))
if len(testParts) > 2 {
t.Fatalf("invalid test case in %q, expected at most 2 parts", p)
}
body := bytes.TrimSpace(testParts[0])
var expectedTitle []byte
if len(testParts) > 1 {
expectedTitle = bytes.TrimSpace(testParts[1])
}
if len(body) > maxBodySize {
body = body[:maxBodySize]
}
testCases[p] = titleTestCase{
body: body,
expectedTitle: string(expectedTitle),
}
}
return testCases
}