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[feature] Support Actor URIs for webfinger queries (#2187)

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* [feature] Support Actor URIs for webfinger queries

It's now possible to pass an Actor URI as the resource to query for when
doing a webfinger query. The code now extracts the username and domain
from the URI. The URI needs to be fully qualified, including having a
scheme of http or https to be recognised as such.

The acct scheme is handled as we used to, including dealing with an
erroneous leading @ on the username. We retain the ability to handle
resources without a scheme by parsing them again with the acct scheme if
the original parse failed. This can happen due to parsing ambiguities
when dealing with a string like user@domain.tld:port.

* [bugfix] Remove debugging changes

* [chore] Make TestExtractNamestring table-driven

* [chore] Unnest Trim and Split for readability
This commit is contained in:
Daenney 2023-09-11 18:38:31 +02:00 committed by GitHub
parent 7011f57b09
commit 2cac5a4613
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 203 additions and 85 deletions
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39
internal/api/wellknown/webfinger/webfingerget_test.go
View file

@ -143,6 +143,45 @@ func (suite *WebfingerGetTestSuite) TestFingerUser() {
}`, resp)
}
func (suite *WebfingerGetTestSuite) TestFingerUserActorURI() {
targetAccount := suite.testAccounts["local_account_1"]
host := config.GetHost()
tests := []struct {
resource string
}{
{resource: fmt.Sprintf("https://%s/@%s", host, targetAccount.Username)},
{resource: fmt.Sprintf("https://%s/users/%s", host, targetAccount.Username)},
}
for _, tt := range tests {
tt := tt
suite.Run(tt.resource, func() {
requestPath := fmt.Sprintf("/%s?resource=%s", webfinger.WebfingerBasePath, tt.resource)
resp := suite.finger(requestPath)
suite.Equal(`{
"subject": "acct:the_mighty_zork@localhost:8080",
"aliases": [
"http://localhost:8080/users/the_mighty_zork",
"http://localhost:8080/@the_mighty_zork"
],
"links": [
{
"rel": "http://webfinger.net/rel/profile-page",
"type": "text/html",
"href": "http://localhost:8080/@the_mighty_zork"
},
{
"rel": "self",
"type": "application/activity+json",
"href": "http://localhost:8080/users/the_mighty_zork"
}
]
}`, resp)
})
}
}
func (suite *WebfingerGetTestSuite) TestFingerUserWithDifferentAccountDomainByHost() {
targetAccount := suite.funkifyAccountDomain("gts.example.org", "example.org")
requestPath := fmt.Sprintf("/%s?resource=acct:%s@%s", webfinger.WebfingerBasePath, targetAccount.Username, config.GetHost())

85
internal/util/namestring.go
View file

@ -19,6 +19,7 @@
import (
"fmt"
"net/url"
"strings"
"github.com/superseriousbusiness/gotosocial/internal/regexes"
@ -40,19 +41,83 @@ func ExtractNamestringParts(mention string) (username, host string, err error) {
}
}
// ExtractWebfingerParts returns username test_user and
// domain example.org from a string like acct:test_user@example.org,
// or acct:@test_user@example.org.
// ExtractWebfingerParts returns the username and domain from either an
// account query or an actor URI.
//
// If nothing is extracted, it will return an error.
// All implementations in the wild generate webfinger account resource
// queries with the "acct" scheme and without a leading "@"" on the username.
// This is also the format the "subject" in a webfinger response adheres to.
//
// Despite this fact, we're being permissive about a single leading @. This
// makes a query for acct:user@domain.tld and acct:@user@domain.tld
// equivalent. But a query for acct:@@user@domain.tld will have its username
// returned with the @ prefix.
//
// We also permit a resource of user@domain.tld or @user@domain.tld, without
// a scheme. In that case it gets interpreted as if it was using the "acct"
// scheme.
//
// When parsing fails, an error is returned.
func ExtractWebfingerParts(webfinger string) (username, host string, err error) {
// remove the acct: prefix if it's present
webfinger = strings.TrimPrefix(webfinger, "acct:")
orig := webfinger
// prepend an @ if necessary
if webfinger[0] != '@' {
webfinger = "@" + webfinger
u, oerr := url.ParseRequestURI(webfinger)
if oerr != nil {
// Most likely reason for failing to parse is if the "acct" scheme was
// missing but a :port was included. So try an extra time with the scheme.
u, err = url.ParseRequestURI("acct:" + webfinger)
if err != nil {
return "", "", fmt.Errorf("failed to parse %s with acct sheme: %w", orig, oerr)
}
}
return ExtractNamestringParts(webfinger)
if u.Scheme == "http" || u.Scheme == "https" {
return ExtractWebfingerPartsFromURI(u)
}
if u.Scheme != "acct" {
return "", "", fmt.Errorf("unsupported scheme: %s for resource: %s", u.Scheme, orig)
}
stripped := strings.TrimPrefix(u.Opaque, "@")
userDomain := strings.Split(stripped, "@")
if len(userDomain) != 2 {
return "", "", fmt.Errorf("failed to extract user and domain from: %s", orig)
}
return userDomain[0], userDomain[1], nil
}
// ExtractWebfingerPartsFromURI returns the user and domain extracted from
// the passed in URI. The URI should be an actor URI.
//
// The domain returned is the hostname, and the user will be extracted
// from either /@test_user or /users/test_user. These two paths match the
// "aliasses" we include in our webfinger response and are also present in
// our "links".
//
// Like with ExtractWebfingerParts, we're being permissive about a single
// leading @.
//
// Errors are returned in case we end up with an empty domain or username.
func ExtractWebfingerPartsFromURI(uri *url.URL) (username, host string, err error) {
host = uri.Host
if host == "" {
return "", "", fmt.Errorf("failed to extract domain from: %s", uri)
}
// strip any leading slashes
path := strings.TrimLeft(uri.Path, "/")
segs := strings.Split(path, "/")
if segs[0] == "users" {
username = segs[1]
} else {
username = segs[0]
}
username = strings.TrimPrefix(username, "@")
if username == "" {
return "", "", fmt.Errorf("failed to extract username from: %s", uri)
}
return
}

164
internal/util/namestring_test.go
View file

@ -18,6 +18,7 @@
package util_test
import (
"net/url"
"testing"
"github.com/stretchr/testify/suite"
@ -28,88 +29,101 @@ type NamestringSuite struct {
suite.Suite
}
func (suite *NamestringSuite) TestExtractWebfingerParts1() {
webfinger := "acct:stonerkitty.monster@stonerkitty.monster"
username, host, err := util.ExtractWebfingerParts(webfinger)
func (suite *NamestringSuite) TestExtractWebfingerParts() {
tests := []struct {
in, username, domain, err string
}{
{in: "acct:stonerkitty.monster@stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "acct:stonerkitty.monster@stonerkitty.monster:8080", username: "stonerkitty.monster", domain: "stonerkitty.monster:8080"},
{in: "acct:@stonerkitty.monster@stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "stonerkitty.monster@stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "stonerkitty.monster@stonerkitty.monster:8080", username: "stonerkitty.monster", domain: "stonerkitty.monster:8080"},
{in: "@stonerkitty.monster@stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "acct:@@stonerkitty.monster@stonerkitty.monster", err: "failed to extract user and domain from: acct:@@stonerkitty.monster@stonerkitty.monster"},
{in: "acct:@stonerkitty.monster@@stonerkitty.monster", err: "failed to extract user and domain from: acct:@stonerkitty.monster@@stonerkitty.monster"},
{in: "@@stonerkitty.monster@stonerkitty.monster", err: "failed to extract user and domain from: @@stonerkitty.monster@stonerkitty.monster"},
{in: "@stonerkitty.monster@@stonerkitty.monster", err: "failed to extract user and domain from: @stonerkitty.monster@@stonerkitty.monster"},
{in: "s3:stonerkitty.monster@stonerkitty.monster", err: "unsupported scheme: s3 for resource: s3:stonerkitty.monster@stonerkitty.monster"},
}
for _, tt := range tests {
tt := tt
suite.Run(tt.in, func() {
suite.T().Parallel()
username, domain, err := util.ExtractWebfingerParts(tt.in)
if tt.err == "" {
suite.NoError(err)
suite.Equal("stonerkitty.monster", username)
suite.Equal("stonerkitty.monster", host)
suite.Equal(tt.username, username)
suite.Equal(tt.domain, domain)
} else {
suite.EqualError(err, tt.err)
}
})
}
}
func (suite *NamestringSuite) TestExtractWebfingerParts2() {
webfinger := "@stonerkitty.monster@stonerkitty.monster"
username, host, err := util.ExtractWebfingerParts(webfinger)
func (suite *NamestringSuite) TestExtractWebfingerPartsFromURI() {
tests := []struct {
in, username, domain, err string
}{
{in: "https://stonerkitty.monster/users/stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "https://stonerkitty.monster/users/@stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "https://stonerkitty.monster/@stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "https://stonerkitty.monster/@@stonerkitty.monster", username: "@stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "https://stonerkitty.monster:8080/users/stonerkitty.monster", username: "stonerkitty.monster", domain: "stonerkitty.monster:8080"},
{in: "https://stonerkitty.monster/users/stonerkitty.monster/evil", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "https://stonerkitty.monster/@stonerkitty.monster/evil", username: "stonerkitty.monster", domain: "stonerkitty.monster"},
{in: "/@stonerkitty.monster", err: "failed to extract domain from: /@stonerkitty.monster"},
{in: "/users/stonerkitty.monster", err: "failed to extract domain from: /users/stonerkitty.monster"},
{in: "@stonerkitty.monster", err: "failed to extract domain from: @stonerkitty.monster"},
{in: "users/stonerkitty.monster", err: "failed to extract domain from: users/stonerkitty.monster"},
{in: "https://stonerkitty.monster/users/", err: "failed to extract username from: https://stonerkitty.monster/users/"},
{in: "https://stonerkitty.monster/users/@", err: "failed to extract username from: https://stonerkitty.monster/users/@"},
{in: "https://stonerkitty.monster/@", err: "failed to extract username from: https://stonerkitty.monster/@"},
{in: "https://stonerkitty.monster/", err: "failed to extract username from: https://stonerkitty.monster/"},
}
for _, tt := range tests {
tt := tt
suite.Run(tt.in, func() {
suite.T().Parallel()
uri, _ := url.Parse(tt.in)
username, domain, err := util.ExtractWebfingerPartsFromURI(uri)
if tt.err == "" {
suite.NoError(err)
suite.Equal("stonerkitty.monster", username)
suite.Equal("stonerkitty.monster", host)
suite.Equal(tt.username, username)
suite.Equal(tt.domain, domain)
} else {
suite.EqualError(err, tt.err)
}
})
}
}
func (suite *NamestringSuite) TestExtractWebfingerParts3() {
webfinger := "acct:someone@somewhere"
username, host, err := util.ExtractWebfingerParts(webfinger)
func (suite *NamestringSuite) TestExtractNamestring() {
tests := []struct {
in, username, host, err string
}{
{in: "@stonerkitty.monster@stonerkitty.monster", username: "stonerkitty.monster", host: "stonerkitty.monster"},
{in: "@stonerkitty.monster", username: "stonerkitty.monster"},
{in: "@someone@somewhere", username: "someone", host: "somewhere"},
{in: "", err: "couldn't match mention "},
}
for _, tt := range tests {
tt := tt
suite.Run(tt.in, func() {
suite.T().Parallel()
username, host, err := util.ExtractNamestringParts(tt.in)
if tt.err != "" {
suite.EqualError(err, tt.err)
} else {
suite.NoError(err)
suite.Equal("someone", username)
suite.Equal("somewhere", host)
}
func (suite *NamestringSuite) TestExtractWebfingerParts4() {
webfinger := "@stoner-kitty.monster@stonerkitty.monster"
username, host, err := util.ExtractWebfingerParts(webfinger)
suite.NoError(err)
suite.Equal("stoner-kitty.monster", username)
suite.Equal("stonerkitty.monster", host)
}
func (suite *NamestringSuite) TestExtractWebfingerParts5() {
webfinger := "@stonerkitty.monster"
username, host, err := util.ExtractWebfingerParts(webfinger)
suite.NoError(err)
suite.Equal("stonerkitty.monster", username)
suite.Empty(host)
}
func (suite *NamestringSuite) TestExtractWebfingerParts6() {
webfinger := "@@stonerkitty.monster"
_, _, err := util.ExtractWebfingerParts(webfinger)
suite.EqualError(err, "couldn't match mention @@stonerkitty.monster")
}
func (suite *NamestringSuite) TestExtractNamestringParts1() {
namestring := "@stonerkitty.monster@stonerkitty.monster"
username, host, err := util.ExtractNamestringParts(namestring)
suite.NoError(err)
suite.Equal("stonerkitty.monster", username)
suite.Equal("stonerkitty.monster", host)
}
func (suite *NamestringSuite) TestExtractNamestringParts2() {
namestring := "@stonerkitty.monster"
username, host, err := util.ExtractNamestringParts(namestring)
suite.NoError(err)
suite.Equal("stonerkitty.monster", username)
suite.Empty(host)
}
func (suite *NamestringSuite) TestExtractNamestringParts3() {
namestring := "@someone@somewhere"
username, host, err := util.ExtractWebfingerParts(namestring)
suite.NoError(err)
suite.Equal("someone", username)
suite.Equal("somewhere", host)
}
func (suite *NamestringSuite) TestExtractNamestringParts4() {
namestring := ""
_, _, err := util.ExtractNamestringParts(namestring)
suite.EqualError(err, "couldn't match mention ")
suite.Equal(tt.username, username)
suite.Equal(tt.host, host)
}
})
}
}
func TestNamestringSuite(t *testing.T) {