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zot/pkg/extensions/search/userprefs_test.go
LaurentiuNiculae 9cc990d7ca
feat(repodb): add user related information to repodb (#1317)
Initial code was contributed by Bogdan BIVOLARU <104334+bogdanbiv@users.noreply.github.com>
Moved implementation from a separate db to repodb by Andrei Aaron <aaaron@luxoft.com>

Not done yet:
- run/test dynamodb implementation, only boltdb was tested
- add additional coverage for existing functionality
- add web-based APIs to toggle the stars/bookmarks on/off

Initially graphql mutation was discussed for the missing API but
we decided REST endpoints would be better suited for configuration



feat(userdb): complete functionality for userdb integration

- dynamodb rollback changes to user starred repos in case increasing the total star count fails
- dynamodb increment/decrement repostars in repometa when user stars/unstars a repo
- dynamodb check anonymous user permissions are working as intendend
- common test handle anonymous users
- RepoMeta2RepoSummary set IsStarred and IsBookmarked



feat(userdb): rest api calls for toggling stars/bookmarks on/off



test(userdb): blackbox tests



test(userdb): move preferences tests in a different file with specific build tags



feat(repodb): add is-starred and is-bookmarked fields to repo-meta

- removed duplicated logic for determining if a repo is starred/bookmarked

Signed-off-by: Laurentiu Niculae <niculae.laurentiu1@gmail.com>
Co-authored-by: Andrei Aaron <aaaron@luxoft.com>
2023-04-24 11:13:15 -07:00

632 lines
19 KiB
Go

//go:build search && userprefs
package search_test
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"os"
"testing"
. "github.com/smartystreets/goconvey/convey"
"golang.org/x/crypto/bcrypt"
"gopkg.in/resty.v1"
"zotregistry.io/zot/pkg/api"
"zotregistry.io/zot/pkg/api/config"
"zotregistry.io/zot/pkg/api/constants"
extconf "zotregistry.io/zot/pkg/extensions/config"
"zotregistry.io/zot/pkg/extensions/monitoring"
"zotregistry.io/zot/pkg/log"
"zotregistry.io/zot/pkg/storage"
"zotregistry.io/zot/pkg/storage/local"
. "zotregistry.io/zot/pkg/test"
)
//nolint:dupl
func TestUserData(t *testing.T) {
Convey("Test user stars and bookmarks", t, func(c C) {
port := GetFreePort()
baseURL := GetBaseURL(port)
defaultVal := true
accessibleRepo := "accessible-repo"
forbiddenRepo := "forbidden-repo"
tag := "0.0.1"
adminUser := "alice"
adminPassword := "deepGoesTheRabbitBurrow"
simpleUser := "test"
simpleUserPassword := "test123"
twoCredTests := fmt.Sprintf("%s\n%s\n\n", getCredString(adminUser, adminPassword),
getCredString(simpleUser, simpleUserPassword))
htpasswdPath := MakeHtpasswdFileFromString(twoCredTests)
defer os.Remove(htpasswdPath)
conf := config.New()
conf.Storage.RootDirectory = t.TempDir()
conf.HTTP.Port = port
conf.HTTP.Auth = &config.AuthConfig{
HTPasswd: config.AuthHTPasswd{
Path: htpasswdPath,
},
}
conf.HTTP.AccessControl = &config.AccessControlConfig{
Repositories: config.Repositories{
"**": config.PolicyGroup{
Policies: []config.Policy{
{
Users: []string{simpleUser},
Actions: []string{"read"},
},
},
AnonymousPolicy: []string{"read"},
DefaultPolicy: []string{},
},
forbiddenRepo: config.PolicyGroup{
Policies: []config.Policy{
{
Users: []string{},
Actions: []string{},
},
},
DefaultPolicy: []string{},
},
},
AdminPolicy: config.Policy{
Users: []string{adminUser},
Actions: []string{"read", "create", "update"},
},
}
conf.Extensions = &extconf.ExtensionConfig{
Search: &extconf.SearchConfig{BaseConfig: extconf.BaseConfig{Enable: &defaultVal}},
}
ctlr := api.NewController(conf)
ctlrManager := NewControllerManager(ctlr)
ctlrManager.StartAndWait(port)
defer ctlrManager.StopServer()
config, layers, manifest, err := GetImageComponents(100)
So(err, ShouldBeNil)
err = UploadImageWithBasicAuth(
Image{
Config: config,
Layers: layers,
Manifest: manifest,
Reference: tag,
}, baseURL, accessibleRepo,
adminUser, adminPassword,
)
So(err, ShouldBeNil)
err = UploadImageWithBasicAuth(
Image{
Config: config,
Layers: layers,
Manifest: manifest,
Reference: tag,
}, baseURL, forbiddenRepo,
adminUser, adminPassword,
)
So(err, ShouldBeNil)
userStaredReposQuery := `{
StarredRepos {
Results {
Name StarCount IsStarred
NewestImage { Tag }
}
}
}`
userBookmarkedReposQuery := `{
BookmarkedRepos {
Results {
Name IsBookmarked
NewestImage { Tag }
}
}
}`
userprefsBaseURL := baseURL + constants.FullUserPreferencesPrefix
Convey("Flip starred repo authorized", func(c C) {
clientHTTP := resty.R().SetBasicAuth(simpleUser, simpleUserPassword)
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoStarURL(accessibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 1)
So(responseStruct.Results[0].Name, ShouldEqual, accessibleRepo)
// need to update RepoSummary according to user settings
So(responseStruct.Results[0].IsStarred, ShouldEqual, true)
So(responseStruct.Results[0].StarCount, ShouldEqual, 1)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoStarURL(accessibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip starred repo unauthenticated user", func(c C) {
clientHTTP := resty.R()
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoStarURL(accessibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusForbidden)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip starred repo unauthorized", func(c C) {
clientHTTP := resty.R().SetBasicAuth(simpleUser, simpleUserPassword)
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoStarURL(forbiddenRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusForbidden)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip starred repo with unauthorized repo and admin user", func(c C) {
clientHTTP := resty.R().SetBasicAuth(adminUser, adminPassword)
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoStarURL(forbiddenRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 1)
So(responseStruct.Results[0].Name, ShouldEqual, forbiddenRepo)
// need to update RepoSummary according to user settings
So(responseStruct.Results[0].IsStarred, ShouldEqual, true)
So(responseStruct.Results[0].StarCount, ShouldEqual, 1)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoStarURL(forbiddenRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userStaredReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip bookmark repo authorized", func(c C) {
clientHTTP := resty.R().SetBasicAuth(simpleUser, simpleUserPassword)
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoBookmarkURL(accessibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 1)
So(responseStruct.Results[0].Name, ShouldEqual, accessibleRepo)
// need to update RepoSummary according to user settings
So(responseStruct.Results[0].IsBookmarked, ShouldEqual, true)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoBookmarkURL(accessibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip bookmark repo unauthenticated user", func(c C) {
clientHTTP := resty.R()
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoBookmarkURL(accessibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusForbidden)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip bookmark repo unauthorized", func(c C) {
clientHTTP := resty.R().SetBasicAuth(simpleUser, simpleUserPassword)
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoBookmarkURL(forbiddenRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusForbidden)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
Convey("Flip bookmarked unauthorized repo and admin user", func(c C) {
clientHTTP := resty.R().SetBasicAuth(adminUser, adminPassword)
resp, err := clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct := BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoBookmarkURL(forbiddenRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 1)
So(responseStruct.Results[0].Name, ShouldEqual, forbiddenRepo)
// need to update RepoSummary according to user settings
So(responseStruct.Results[0].IsBookmarked, ShouldEqual, true)
resp, err = clientHTTP.Put(userprefsBaseURL + PutRepoBookmarkURL(forbiddenRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = clientHTTP.Get(baseURL + constants.FullSearchPrefix +
"?query=" + url.QueryEscape(userBookmarkedReposQuery))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, 200)
responseStruct = BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 0)
})
})
}
func TestChangingRepoState(t *testing.T) {
port := GetFreePort()
baseURL := GetBaseURL(port)
defaultVal := true
simpleUser := "test"
simpleUserPassword := "test123"
forbiddenRepo := "forbidden"
accesibleRepo := "accesible"
credTests := fmt.Sprintf("%s\n\n", getCredString(simpleUser, simpleUserPassword))
htpasswdPath := MakeHtpasswdFileFromString(credTests)
defer os.Remove(htpasswdPath)
conf := config.New()
conf.Storage.RootDirectory = t.TempDir()
conf.HTTP.Port = port
conf.HTTP.Auth = &config.AuthConfig{
HTPasswd: config.AuthHTPasswd{
Path: htpasswdPath,
},
}
conf.HTTP.AccessControl = &config.AccessControlConfig{
Repositories: config.Repositories{
"**": config.PolicyGroup{
Policies: []config.Policy{
{
Users: []string{simpleUser},
Actions: []string{"read"},
},
},
AnonymousPolicy: []string{"read"},
DefaultPolicy: []string{},
},
forbiddenRepo: config.PolicyGroup{
Policies: []config.Policy{
{
Users: []string{},
Actions: []string{},
},
},
DefaultPolicy: []string{},
},
},
}
conf.Extensions = &extconf.ExtensionConfig{
Search: &extconf.SearchConfig{BaseConfig: extconf.BaseConfig{Enable: &defaultVal}},
}
gqlStarredRepos := `
{
StarredRepos() {
Results {
Name
StarCount
IsBookmarked
IsStarred
}
}
}
`
gqlBookmarkedRepos := `
{
BookmarkedRepos() {
Results {
Name
StarCount
IsBookmarked
IsStarred
}
}
}
`
ctlr := api.NewController(conf)
img, err := GetRandomImage("tag")
if err != nil {
t.FailNow()
}
// ------ Create the test repos
defaultStore := local.NewImageStore(conf.Storage.RootDirectory, false, 0, false, false,
log.NewLogger("debug", ""), monitoring.NewMetricsServer(false, log.NewLogger("debug", "")), nil, nil)
err = WriteImageToFileSystem(img, accesibleRepo, storage.StoreController{
DefaultStore: defaultStore,
})
if err != nil {
t.FailNow()
}
err = WriteImageToFileSystem(img, forbiddenRepo, storage.StoreController{
DefaultStore: defaultStore,
})
if err != nil {
t.FailNow()
}
ctlrManager := NewControllerManager(ctlr)
ctlrManager.StartAndWait(port)
defer ctlrManager.StopServer()
simpleUserClient := resty.R().SetBasicAuth(simpleUser, simpleUserPassword)
anonynousClient := resty.R()
userprefsBaseURL := baseURL + constants.FullUserPreferencesPrefix
Convey("PutStars", t, func() {
resp, err := simpleUserClient.Put(userprefsBaseURL + PutRepoStarURL(accesibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = simpleUserClient.Get(baseURL + graphqlQueryPrefix + "?query=" + url.QueryEscape(gqlStarredRepos))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
responseStruct := StarredReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 1)
So(responseStruct.Results[0].IsStarred, ShouldBeTrue)
So(responseStruct.Results[0].Name, ShouldResemble, accesibleRepo)
resp, err = anonynousClient.Put(userprefsBaseURL + PutRepoStarURL(accesibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusForbidden)
})
//
Convey("PutBookmark", t, func() {
resp, err := simpleUserClient.Put(userprefsBaseURL + PutRepoBookmarkURL(accesibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
resp, err = simpleUserClient.Get(baseURL + graphqlQueryPrefix + "?query=" + url.QueryEscape(gqlBookmarkedRepos))
So(err, ShouldBeNil)
So(resp, ShouldNotBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusOK)
responseStruct := BookmarkedReposResponse{}
err = json.Unmarshal(resp.Body(), &responseStruct)
So(err, ShouldBeNil)
So(err, ShouldBeNil)
So(len(responseStruct.Results), ShouldEqual, 1)
So(responseStruct.Results[0].IsBookmarked, ShouldBeTrue)
So(responseStruct.Results[0].Name, ShouldResemble, accesibleRepo)
resp, err = anonynousClient.Put(userprefsBaseURL + PutRepoBookmarkURL(accesibleRepo))
So(err, ShouldBeNil)
So(resp.StatusCode(), ShouldEqual, http.StatusForbidden)
})
}
func PutRepoStarURL(repo string) string {
return fmt.Sprintf("?repo=%s&action=toggleStar", repo)
}
func PutRepoBookmarkURL(repo string) string {
return fmt.Sprintf("?repo=%s&action=toggleBookmark", repo)
}
func getCredString(username, password string) string {
hash, err := bcrypt.GenerateFromPassword([]byte(password), 10)
if err != nil {
panic(err)
}
usernameAndHash := fmt.Sprintf("%s:%s", username, string(hash))
return usernameAndHash
}