#12897 - add mastodon provider (#13293)

* added mastodon provider to oauth code

* changed go.mod and vendor/modules.txt to add updated goth

* vendored mastodon and new goth

* committing result of go mod tidy && go mod vendor

* added pic and mastodon to oauth models

* handled instance url

* applied lafriks suggestion

* Update web_src/js/index.js

Co-authored-by: techknowlogick <matti@mdranta.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <matti@mdranta.net>

11 files changed, 327 insertions, 1 deletions

diff --git a/go.sum b/go.sum
index abe593297b..5dcd2ba6c8 100644
--- a/go.sum
+++ b/go.sum
@@ -108,6 +108,7 @@ github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/g
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@@ -188,7 +189,9 @@ github.com/bradfitz/gomemcache v0.0.0-20190329173943-551aad21a668/go.mod h1:H0wQ
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@@ -1127,6 +1147,7 @@ github.com/unknwon/paginater v0.0.0-20151104151617-7748a72e0141 h1:Z79lyIznnziKA
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@@ -1138,6 +1159,7 @@ github.com/willf/bitset v1.1.10 h1:NotGKqX0KwQ72NUzqrjZq5ipPNDQex9lo3WpaS8L2sc=
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@@ -1295,6 +1317,8 @@ golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81R
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@@ -1608,9 +1652,11 @@ gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -1625,15 +1671,23 @@ mvdan.cc/gofumpt v0.0.0-20200709182408-4fd085cb6d5f/go.mod h1:9VQ397fNXEnF84t90W
 mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
 mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZIVpwbkw+04kSxk3rAtzlimaUJw=
+mvdan.cc/xurls/v2 v2.2.0 h1:NSZPykBXJFCetGZykLAxaL6SIpvbVy/UFEniIfHAa8A=
 mvdan.cc/xurls/v2 v2.2.0/go.mod h1:EV1RMtya9D6G5DMYPGD8zTQzaHet6Jh8gFlRgGRJeO8=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
+strk.kbt.io/projects/go/libravatar v0.0.0-20191008002943-06d1c002b251 h1:mUcz5b3FJbP5Cvdq7Khzn6J9OCUQJaBwgBkCR+MOwSs=
 strk.kbt.io/projects/go/libravatar v0.0.0-20191008002943-06d1c002b251/go.mod h1:FJGmPh3vz9jSos1L/F91iAgnC/aejc0wIIrF2ZwJxdY=
 xorm.io/builder v0.3.6/go.mod h1:LEFAPISnRzG+zxaxj2vPicRwz67BdhFreKg8yv8/TgU=
+xorm.io/builder v0.3.7 h1:2pETdKRK+2QG4mLX4oODHEhn5Z8j1m8sXa7jfu+/SZI=
 xorm.io/builder v0.3.7/go.mod h1:aUW0S9eb9VCaPohFCH3j7czOx1PMW3i1HrSzbLYGBSE=
+xorm.io/core v0.7.2 h1:mEO22A2Z7a3fPaZMk6gKL/jMD80iiyNwRrX5HOv3XLw=
 xorm.io/core v0.7.2/go.mod h1:jJfd0UAEzZ4t87nbQYtVjmqpIODugN6PD2D9E+dJvdM=
 xorm.io/xorm v0.8.0/go.mod h1:ZkJLEYLoVyg7amJK/5r779bHyzs2AU8f8VMiP6BM7uY=
+xorm.io/xorm v1.0.5 h1:LRr5PfOUb4ODPR63YwbowkNDwcolT2LnkwP/TUaMaB0=
 xorm.io/xorm v1.0.5/go.mod h1:uF9EtbhODq5kNWxMbnBEj8hRRZnlcNSz2t2N7HW/+A4=
diff --git a/models/oauth2.go b/models/oauth2.go
index ccf24eb35d..65d62fdb61 100644
--- a/models/oauth2.go
+++ b/models/oauth2.go
@@ -59,6 +59,11 @@ var OAuth2Providers = map[string]OAuth2Provider{
 		},
 	},
 	"yandex": {Name: "yandex", DisplayName: "Yandex", Image: "/img/auth/yandex.png"},
+	"mastodon": {Name: "mastodon", DisplayName: "Mastodon", Image: "/img/auth/mastodon.png",
+		CustomURLMapping: &oauth2.CustomURLMapping{
+			AuthURL: oauth2.GetDefaultAuthURL("mastodon"),
+		},
+	},
 }
 
 // OAuth2DefaultCustomURLMappings contains the map of default URL's for OAuth2 providers that are allowed to have custom urls
@@ -69,6 +74,7 @@ var OAuth2DefaultCustomURLMappings = map[string]*oauth2.CustomURLMapping{
 	"gitlab":    OAuth2Providers["gitlab"].CustomURLMapping,
 	"gitea":     OAuth2Providers["gitea"].CustomURLMapping,
 	"nextcloud": OAuth2Providers["nextcloud"].CustomURLMapping,
+	"mastodon":  OAuth2Providers["mastodon"].CustomURLMapping,
 }
 
 // GetActiveOAuth2ProviderLoginSources returns all actived LoginOAuth2 sources
diff --git a/modules/auth/oauth2/oauth2.go b/modules/auth/oauth2/oauth2.go
index 2c982e1dca..f69bc61d75 100644
--- a/modules/auth/oauth2/oauth2.go
+++ b/modules/auth/oauth2/oauth2.go
@@ -23,6 +23,7 @@ import (
 	"github.com/markbates/goth/providers/github"
 	"github.com/markbates/goth/providers/gitlab"
 	"github.com/markbates/goth/providers/google"
+	"github.com/markbates/goth/providers/mastodon"
 	"github.com/markbates/goth/providers/nextcloud"
 	"github.com/markbates/goth/providers/openidConnect"
 	"github.com/markbates/goth/providers/twitter"
@@ -213,6 +214,12 @@ func createProvider(providerName, providerType, clientID, clientSecret, openIDCo
 	case "yandex":
 		// See https://tech.yandex.com/passport/doc/dg/reference/response-docpage/
 		provider = yandex.New(clientID, clientSecret, callbackURL, "login:email", "login:info", "login:avatar")
+	case "mastodon":
+		instanceURL := mastodon.InstanceURL
+		if customURLMapping != nil && len(customURLMapping.AuthURL) > 0 {
+			instanceURL = customURLMapping.AuthURL
+		}
+		provider = mastodon.NewCustomisedURL(clientID, clientSecret, callbackURL, instanceURL)
 	}
 
 	// always set the name if provider is created so we can support multiple setups of 1 provider
@@ -249,6 +256,8 @@ func GetDefaultAuthURL(provider string) string {
 		return gitea.AuthURL
 	case "nextcloud":
 		return nextcloud.AuthURL
+	case "mastodon":
+		return mastodon.InstanceURL
 	}
 	return ""
 }
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index cb4415afbb..9864346bac 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -2208,6 +2208,7 @@ auths.tip.twitter = Go to https://dev.twitter.com/apps, create an application an
 auths.tip.discord = Register a new application on https://discordapp.com/developers/applications/me
 auths.tip.gitea = Register a new OAuth2 application. Guide can be found at https://docs.gitea.io/en-us/oauth2-provider/
 auths.tip.yandex = Create a new application at https://oauth.yandex.com/client/new. Select following permissions from the "Yandex.Passport API" section: "Access to email address", "Access to user avatar" and "Access to username, first name and surname, gender"
+auths.tip.mastodon = Input a custom instance URL for the mastodon instance you want to authenticate with (or use the default one)
 auths.edit = Edit Authentication Source
 auths.activated = This Authentication Source is Activated
 auths.new_success = The authentication '%s' has been added.
diff --git a/public/img/auth/mastodon.png b/public/img/auth/mastodon.png
new file mode 100644
index 0000000000..67254aad4c
--- /dev/null
+++ b/public/img/auth/mastodon.png
diff --git a/templates/admin/auth/new.tmpl b/templates/admin/auth/new.tmpl
index f160525102..5519f0b63a 100644
--- a/templates/admin/auth/new.tmpl
+++ b/templates/admin/auth/new.tmpl
@@ -119,6 +119,8 @@
 				<span>{{.i18n.Tr "admin.auths.tip.nextcloud"}}</span>
 				<li>Yandex</li>
 				<span>{{.i18n.Tr "admin.auths.tip.yandex"}}</span>
+        <li>Mastodon</li>
+        <span>{{.i18n.Tr "admin.auths.tip.mastodon"}}</span>
 			</div>
 		</div>
 	</div>
diff --git a/templates/admin/auth/source/oauth.tmpl b/templates/admin/auth/source/oauth.tmpl
index 5d585c04dc..148a99a5ea 100644
--- a/templates/admin/auth/source/oauth.tmpl
+++ b/templates/admin/auth/source/oauth.tmpl
@@ -55,4 +55,4 @@
 			<input id="{{$key}}_email_url" value="{{$value.EmailURL}}" type="hidden" />
 		{{end}}
 	{{end}}
-</div>
\ No newline at end of file
+</div>
diff --git a/vendor/github.com/markbates/goth/providers/mastodon/mastodon.go b/vendor/github.com/markbates/goth/providers/mastodon/mastodon.go
new file mode 100644
index 0000000000..5282b88e58
--- /dev/null
+++ b/vendor/github.com/markbates/goth/providers/mastodon/mastodon.go
@@ -0,0 +1,185 @@
+// Package mastodon implements the OAuth2 protocol for authenticating users through Mastodon.
+// This package can be used as a reference implementation of an OAuth2 provider for Goth.
+package mastodon
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	"github.com/markbates/goth"
+	"golang.org/x/oauth2"
+)
+
+// Mastodon.social is the flagship instance of mastodon
+var (
+	InstanceURL = "https://mastodon.social/"
+)
+
+// Provider is the implementation of `goth.Provider` for accessing Mastodon.
+type Provider struct {
+	ClientKey    string
+	Secret       string
+	CallbackURL  string
+	HTTPClient   *http.Client
+	config       *oauth2.Config
+	providerName string
+	authURL      string
+	tokenURL     string
+	profileURL   string
+}
+
+// New creates a new Mastodon provider and sets up important connection details.
+// You should always call `mastodon.New` to get a new provider.  Never try to
+// create one manually.
+func New(clientKey, secret, callbackURL string, scopes ...string) *Provider {
+	return NewCustomisedURL(clientKey, secret, callbackURL, InstanceURL, scopes...)
+}
+
+// NewCustomisedURL is similar to New(...) but can be used to set custom URLs to connect to
+func NewCustomisedURL(clientKey, secret, callbackURL, instanceURL string, scopes ...string) *Provider {
+	instanceURL = fmt.Sprintf("%s/", strings.TrimSuffix(instanceURL, "/"))
+	profileURL := fmt.Sprintf("%sapi/v1/accounts/verify_credentials", instanceURL)
+	authURL := fmt.Sprintf("%soauth/authorize", instanceURL)
+	tokenURL := fmt.Sprintf("%soauth/token", instanceURL)
+	p := &Provider{
+		ClientKey:    clientKey,
+		Secret:       secret,
+		CallbackURL:  callbackURL,
+		providerName: "mastodon",
+		profileURL:   profileURL,
+	}
+	p.config = newConfig(p, authURL, tokenURL, scopes)
+	return p
+}
+
+// Name is the name used to retrieve this provider later.
+func (p *Provider) Name() string {
+	return p.providerName
+}
+
+// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
+func (p *Provider) SetName(name string) {
+	p.providerName = name
+}
+
+func (p *Provider) Client() *http.Client {
+	return goth.HTTPClientWithFallBack(p.HTTPClient)
+}
+
+// Debug is a no-op for the Mastodon package.
+func (p *Provider) Debug(debug bool) {}
+
+// BeginAuth asks Mastodon for an authentication end-point.
+func (p *Provider) BeginAuth(state string) (goth.Session, error) {
+	return &Session{
+		AuthURL: p.config.AuthCodeURL(state),
+	}, nil
+}
+
+// FetchUser will go to Mastodon and access basic information about the user.
+func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
+	sess := session.(*Session)
+	user := goth.User{
+		AccessToken:  sess.AccessToken,
+		Provider:     p.Name(),
+		RefreshToken: sess.RefreshToken,
+		ExpiresAt:    sess.ExpiresAt,
+	}
+
+	if user.AccessToken == "" {
+		// data is not yet retrieved since accessToken is still empty
+		return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
+	}
+
+	req, err := http.NewRequest("GET", p.profileURL, nil)
+	if err != nil {
+		return user, err
+	}
+
+	req.Header.Add("Authorization", "Bearer "+sess.AccessToken)
+	response, err := p.Client().Do(req)
+	if err != nil {
+		return user, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
+	}
+
+	bits, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return user, err
+	}
+
+	err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
+	if err != nil {
+		return user, err
+	}
+
+	err = userFromReader(bytes.NewReader(bits), &user)
+
+	return user, err
+}
+
+func newConfig(provider *Provider, authURL, tokenURL string, scopes []string) *oauth2.Config {
+	c := &oauth2.Config{
+		ClientID:     provider.ClientKey,
+		ClientSecret: provider.Secret,
+		RedirectURL:  provider.CallbackURL,
+		Endpoint: oauth2.Endpoint{
+			AuthURL:  authURL,
+			TokenURL: tokenURL,
+		},
+		Scopes: []string{},
+	}
+
+	if len(scopes) > 0 {
+		for _, scope := range scopes {
+			c.Scopes = append(c.Scopes, scope)
+		}
+	}
+	return c
+}
+
+func userFromReader(r io.Reader, user *goth.User) error {
+	u := struct {
+		Name      string `json:"display_name"`
+		NickName  string `json:"username"`
+		ID        string `json:"id"`
+		AvatarURL string `json:"avatar"`
+	}{}
+	err := json.NewDecoder(r).Decode(&u)
+	if err != nil {
+		return err
+	}
+	user.Name = u.Name
+	if len(user.Name) == 0 {
+		user.Name = u.NickName
+	}
+	user.NickName = u.NickName
+	user.UserID = u.ID
+	user.AvatarURL = u.AvatarURL
+	return nil
+}
+
+//RefreshTokenAvailable refresh token is provided by auth provider or not
+func (p *Provider) RefreshTokenAvailable() bool {
+	return true
+}
+
+//RefreshToken get new access token based on the refresh token
+func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
+	token := &oauth2.Token{RefreshToken: refreshToken}
+	ts := p.config.TokenSource(goth.ContextForClient(p.Client()), token)
+	newToken, err := ts.Token()
+	if err != nil {
+		return nil, err
+	}
+	return newToken, err
+}
diff --git a/vendor/github.com/markbates/goth/providers/mastodon/session.go b/vendor/github.com/markbates/goth/providers/mastodon/session.go
new file mode 100644
index 0000000000..b975c0805e
--- /dev/null
+++ b/vendor/github.com/markbates/goth/providers/mastodon/session.go
@@ -0,0 +1,63 @@
+package mastodon
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/markbates/goth"
+)
+
+// Session stores data during the auth process with Gitea.
+type Session struct {
+	AuthURL      string
+	AccessToken  string
+	RefreshToken string
+	ExpiresAt    time.Time
+}
+
+var _ goth.Session = &Session{}
+
+// GetAuthURL will return the URL set by calling the `BeginAuth` function on the Gitea provider.
+func (s Session) GetAuthURL() (string, error) {
+	if s.AuthURL == "" {
+		return "", errors.New(goth.NoAuthUrlErrorMessage)
+	}
+	return s.AuthURL, nil
+}
+
+// Authorize the session with Gitea and return the access token to be stored for future use.
+func (s *Session) Authorize(provider goth.Provider, params goth.Params) (string, error) {
+	p := provider.(*Provider)
+	token, err := p.config.Exchange(goth.ContextForClient(p.Client()), params.Get("code"))
+	if err != nil {
+		return "", err
+	}
+
+	if !token.Valid() {
+		return "", errors.New("Invalid token received from provider")
+	}
+
+	s.AccessToken = token.AccessToken
+	s.RefreshToken = token.RefreshToken
+	s.ExpiresAt = token.Expiry
+	return token.AccessToken, err
+}
+
+// Marshal the session into a string
+func (s Session) Marshal() string {
+	b, _ := json.Marshal(s)
+	return string(b)
+}
+
+func (s Session) String() string {
+	return s.Marshal()
+}
+
+// UnmarshalSession wil unmarshal a JSON string into a session.
+func (p *Provider) UnmarshalSession(data string) (goth.Session, error) {
+	s := &Session{}
+	err := json.NewDecoder(strings.NewReader(data)).Decode(s)
+	return s, err
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 5c58a018f8..53e4514c9a 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -559,6 +559,7 @@ github.com/markbates/goth/providers/gitea
 github.com/markbates/goth/providers/github
 github.com/markbates/goth/providers/gitlab
 github.com/markbates/goth/providers/google
+github.com/markbates/goth/providers/mastodon
 github.com/markbates/goth/providers/nextcloud
 github.com/markbates/goth/providers/openidConnect
 github.com/markbates/goth/providers/twitter
diff --git a/web_src/js/index.js b/web_src/js/index.js
index c25bce1d00..cdabffe04d 100644
--- a/web_src/js/index.js
+++ b/web_src/js/index.js
@@ -1798,6 +1798,7 @@ function initAdmin() {
       case 'gitlab':
       case 'gitea':
       case 'nextcloud':
+      case 'mastodon':
         $('.oauth2_use_custom_url').show();
         break;
       case 'openidConnect':
@@ -1831,6 +1832,10 @@ function initAdmin() {
           $('.oauth2_token_url, .oauth2_auth_url, .oauth2_profile_url').show();
           $('#oauth2_email_url').val('');
           break;
+        case 'mastodon':
+          $('.oauth2_auth_url input').attr('required', 'required');
+          $('.oauth2_auth_url').show();
+          break;
       }
     }
   }