Remove external API calls in `TestPassword` (#30716)

The test had a dependency on `https://api.pwnedpasswords.com` which
caused many failures on CI recently:

```
--- FAIL: TestPassword (2.37s)
    pwn_test.go:41: Get "https://api.pwnedpasswords.com/range/e6b6a": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
FAIL
coverage: 82.9% of statements
```

go.mod

@@ -59,6 +59,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/feeds v1.1.2
 	github.com/gorilla/sessions v1.2.2
+	github.com/h2non/gock v1.2.0
 	github.com/hashicorp/go-version v1.6.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/huandu/xstrings v1.4.0
@@ -209,6 +210,7 @@ require (
 	github.com/gorilla/handlers v1.5.2 // indirect
 	github.com/gorilla/mux v1.8.1 // indirect
 	github.com/gorilla/securecookie v1.1.2 // indirect
+	github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-retryablehttp v0.7.5 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect

go.sum

@@ -430,6 +430,10 @@ github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pw
 github.com/gorilla/sessions v1.2.0/go.mod h1:dk2InVEVJ0sfLlnXv9EAgkf6ecYs/i80K/zI+bUmuGM=
 github.com/gorilla/sessions v1.2.2 h1:lqzMYz6bOfvn2WriPUjNByzeXIlVzURcPmgMczkmTjY=
 github.com/gorilla/sessions v1.2.2/go.mod h1:ePLdVu+jbEgHH+KWw8I1z2wqd0BAdAQh/8LRvBeoNcQ=
+github.com/h2non/gock v1.2.0 h1:K6ol8rfrRkUOefooBC8elXoaNGYkpp7y2qcxGG6BzUE=
+github.com/h2non/gock v1.2.0/go.mod h1:tNhoxHYW2W42cYkYb1WqzdbYIieALC99kpYr7rH/BQk=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542 h1:2VTzZjLZBgl62/EtslCrtky5vbi9dd7HrQPQIx6wqiw=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542/go.mod h1:Ow0tF8D4Kplbc8s8sSb3V2oUCygFHVp8gC3Dn6U4MNI=
 github.com/hashicorp/go-cleanhttp v0.5.2 h1:035FKYIWjmULyFRBKPs8TBQoi0x6d9G4xc9neXJWAZQ=
 github.com/hashicorp/go-cleanhttp v0.5.2/go.mod h1:kO/YDlP8L1346E6Sodw+PrpBSV4/SoxCXGY6BqNFT48=
 github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
@@ -591,6 +595,8 @@ github.com/mschoch/smat v0.2.0 h1:8imxQsjDm8yFEAVBe7azKmKSgzSkZXDuKkSq9374khM=
 github.com/mschoch/smat v0.2.0/go.mod h1:kc9mz7DoBKqDyiRL7VZN8KvXQMWeTaVnttLRXOlotKw=
 github.com/msteinert/pam v1.2.0 h1:mYfjlvN2KYs2Pb9G6nb/1f/nPfAttT/Jee5Sq9r3bGE=
 github.com/msteinert/pam v1.2.0/go.mod h1:d2n0DCUK8rGecChV3JzvmsDjOY4R7AYbsNxAT+ftQl0=
+github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32 h1:W6apQkHrMkS0Muv8G/TipAy/FJl/rCYT0+EuS8+Z0z4=
+github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32/go.mod h1:9wM+0iRr9ahx58uYLpLIr5fm8diHn0JbqRycJi6w0Ms=
 github.com/niklasfasching/go-org v1.7.0 h1:vyMdcMWWTe/XmANk19F4k8XGBYg0GQ/gJGMimOjGMek=
 github.com/niklasfasching/go-org v1.7.0/go.mod h1:WuVm4d45oePiE0eX25GqTDQIt/qPW1T9DGkRscqLW5o=
 github.com/nwaples/rardecode v1.1.0/go.mod h1:5DzqNKiOdpKKBH87u8VlvAnPZMXcGRhxWkRpHbbfGS0=

modules/auth/password/pwn/pwn_test.go

@@ -4,12 +4,11 @@
 package pwn
 
 import (
-	"math/rand/v2"
 	"net/http"
-	"strings"
 	"testing"
 	"time"
 
+	"github.com/h2non/gock"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -18,86 +17,34 @@ var client = New(WithHTTP(&http.Client{
 }))
 
 func TestPassword(t *testing.T) {
-	// Check input error
-	_, err := client.CheckPassword("", false)
+	defer gock.Off()
+
+	count, err := client.CheckPassword("", false)
 	assert.ErrorIs(t, err, ErrEmptyPassword, "blank input should return ErrEmptyPassword")
+	assert.Equal(t, -1, count)
 
-	// Should fail
-	fail := "password1234"
-	count, err := client.CheckPassword(fail, false)
-	assert.NotEmpty(t, count, "%s should fail as a password", fail)
+	gock.New("https://api.pwnedpasswords.com").Get("/range/5c1d8").Times(1).Reply(200).BodyString("EAF2F254732680E8AC339B84F3266ECCBB5:1\r\nFC446EB88938834178CB9322C1EE273C2A7:2")
+	count, err = client.CheckPassword("pwned", false)
 	assert.NoError(t, err)
+	assert.Equal(t, 1, count)
 
-	// Should fail (with padding)
-	failPad := "administrator"
-	count, err = client.CheckPassword(failPad, true)
-	assert.NotEmpty(t, count, "%s should fail as a password", failPad)
+	gock.New("https://api.pwnedpasswords.com").Get("/range/ba189").Times(1).Reply(200).BodyString("FD4CB34F0378BCB15D23F6FFD28F0775C9E:3\r\nFDF342FCD8C3611DAE4D76E8A992A3E4169:4")
+	count, err = client.CheckPassword("notpwned", false)
 	assert.NoError(t, err)
+	assert.Equal(t, 0, count)
 
-	// Checking for a "good" password isn't going to be perfect, but we can give it a good try
-	// with hopefully minimal error. Try five times?
-	assert.Condition(t, func() bool {
-		for i := 0; i <= 5; i++ {
-			count, err = client.CheckPassword(testPassword(), false)
-			assert.NoError(t, err)
-			if count == 0 {
-				return true
-			}
-		}
-		return false
-	}, "no generated passwords passed. there is a chance this is a fluke")
-
-	// Again, but with padded responses
-	assert.Condition(t, func() bool {
-		for i := 0; i <= 5; i++ {
-			count, err = client.CheckPassword(testPassword(), true)
-			assert.NoError(t, err)
-			if count == 0 {
-				return true
-			}
-		}
-		return false
-	}, "no generated passwords passed. there is a chance this is a fluke")
-}
-
-// Credit to https://golangbyexample.com/generate-random-password-golang/
-// DO NOT USE THIS FOR AN ACTUAL PASSWORD GENERATOR
-var (
-	lowerCharSet   = "abcdedfghijklmnopqrst"
-	upperCharSet   = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-	specialCharSet = "!@#$%&*"
-	numberSet      = "0123456789"
-	allCharSet     = lowerCharSet + upperCharSet + specialCharSet + numberSet
-)
-
-func testPassword() string {
-	var password strings.Builder
-
-	// Set special character
-	for i := 0; i < 5; i++ {
-		random := rand.IntN(len(specialCharSet))
-		password.WriteString(string(specialCharSet[random]))
-	}
-
-	// Set numeric
-	for i := 0; i < 5; i++ {
-		random := rand.IntN(len(numberSet))
-		password.WriteString(string(numberSet[random]))
-	}
+	gock.New("https://api.pwnedpasswords.com").Get("/range/a1733").Times(1).Reply(200).BodyString("C4CE0F1F0062B27B9E2F41AF0C08218017C:1\r\nFC446EB88938834178CB9322C1EE273C2A7:2\r\nFE81480327C992FE62065A827429DD1318B:0")
+	count, err = client.CheckPassword("paddedpwned", true)
+	assert.NoError(t, err)
+	assert.Equal(t, 1, count)
 
-	// Set uppercase
-	for i := 0; i < 5; i++ {
-		random := rand.IntN(len(upperCharSet))
-		password.WriteString(string(upperCharSet[random]))
-	}
+	gock.New("https://api.pwnedpasswords.com").Get("/range/5617b").Times(1).Reply(200).BodyString("FD4CB34F0378BCB15D23F6FFD28F0775C9E:3\r\nFDF342FCD8C3611DAE4D76E8A992A3E4169:4\r\nFE81480327C992FE62065A827429DD1318B:0")
+	count, err = client.CheckPassword("paddednotpwned", true)
+	assert.NoError(t, err)
+	assert.Equal(t, 0, count)
 
-	for i := 0; i < 5; i++ {
-		random := rand.IntN(len(allCharSet))
-		password.WriteString(string(allCharSet[random]))
-	}
-	inRune := []rune(password.String())
-	rand.Shuffle(len(inRune), func(i, j int) {
-		inRune[i], inRune[j] = inRune[j], inRune[i]
-	})
-	return string(inRune)
+	gock.New("https://api.pwnedpasswords.com").Get("/range/79082").Times(1).Reply(200).BodyString("FDF342FCD8C3611DAE4D76E8A992A3E4169:4\r\nFE81480327C992FE62065A827429DD1318B:0\r\nAFEF386F56EB0B4BE314E07696E5E6E6536:0")
+	count, err = client.CheckPassword("paddednotpwnedzero", true)
+	assert.NoError(t, err)
+	assert.Equal(t, 0, count)
 }