auth flow working for code

This commit is contained in:
tsmethurst 2021-03-18 23:27:43 +01:00
parent b6087cc08d
commit 1b11884121
14 changed files with 275 additions and 129 deletions

3
.gitignore vendored
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@ -3,3 +3,6 @@
# exclude built documentation, since readthedocs will build it for us anyway
/docs/_build
# exclude coverage report
cp.out

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@ -95,6 +95,14 @@ func main() {
Value: "postgres",
EnvVars: []string{envNames.DbDatabase},
},
// TEMPLATE FLAGS
&cli.StringFlag{
Name: flagNames.TemplateBaseDir,
Usage: "Basedir for html templating files for rendering pages and composing emails",
Value: "./web/template/",
EnvVars: []string{envNames.TemplateBaseDir},
},
},
Commands: []*cli.Command{
{
@ -137,12 +145,12 @@ func main() {
func runAction(c *cli.Context, a action.GTSAction) error {
// create a new *config.Config based on the config path provided...
conf, err := config.New(c.String(config.GetFlagNames().ConfigPath))
conf, err := config.FromFile(c.String(config.GetFlagNames().ConfigPath))
if err != nil {
return fmt.Errorf("error creating config: %s", err)
}
// ... and the flags set on the *cli.Context by urfave
conf.ParseFlags(c)
conf.ParseCLIFlags(c)
// create a logger with the log level, formatting, and output splitter already set
log, err := log.New(conf.LogLevel)

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@ -60,3 +60,10 @@ db:
# Examples: ["mydb","postgres","gotosocial"]
# Default: "postgres"
database: "postgres"
# Config pertaining to templating of web pages/email notifications and the like
template:
# String. Directory from which gotosocial will attempt to load html templates (.tmpl files).
# Examples: ["/some/absolute/path/", "./relative/path/", "../../some/weird/path/"]
# Default: "./web/template/"
baseDir: "./web/template/"

2
go.mod
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@ -11,7 +11,7 @@ require (
github.com/go-session/session v3.1.2+incompatible
github.com/golang/mock v1.4.4 // indirect
github.com/google/uuid v1.2.0 // indirect
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210316171520-7b12112bbb88
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318133800-45d321d259b3
github.com/onsi/ginkgo v1.15.0 // indirect
github.com/onsi/gomega v1.10.5 // indirect
github.com/sirupsen/logrus v1.8.0

6
go.sum
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@ -107,6 +107,12 @@ github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0U
github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210316171520-7b12112bbb88 h1:YJ//HmHOYJ4srm/LA6VPNjNisneMbY6TTM1xttV/ZQU=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210316171520-7b12112bbb88/go.mod h1:zl5kwHf/atRUrY5yOyDnk49Us1Ygs0BzdW4jKAgoiP8=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318132047-b7df44000ea6 h1:mWWMTK2Boy6FSCi45WB6GVCcXW3IoTVJKJiHmmdjywU=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318132047-b7df44000ea6/go.mod h1:zl5kwHf/atRUrY5yOyDnk49Us1Ygs0BzdW4jKAgoiP8=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318132554-68b81fe90e62 h1:duqoA9NSY+BFY2IVveXx5lSvIQliVvPsaNMdspkTJPc=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318132554-68b81fe90e62/go.mod h1:zl5kwHf/atRUrY5yOyDnk49Us1Ygs0BzdW4jKAgoiP8=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318133800-45d321d259b3 h1:CKRz5d7mRum+UMR88Ue33tCYcej14WjUsB59C02DDqY=
github.com/gotosocial/oauth2/v4 v4.2.1-0.20210318133800-45d321d259b3/go.mod h1:zl5kwHf/atRUrY5yOyDnk49Us1Ygs0BzdW4jKAgoiP8=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
github.com/imkira/go-interpol v1.1.0 h1:KIiKr0VSG2CUW1hl1jpiyuzuJeKUUpC8iM1AIE7N1Vk=
github.com/imkira/go-interpol v1.1.0/go.mod h1:z0h2/2T3XF8kyEPpRgJ3kmNv+C43p+I/CoI+jC3w2iA=

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@ -19,6 +19,10 @@
package api
import (
"fmt"
"os"
"path/filepath"
"github.com/gin-contrib/sessions"
"github.com/gin-contrib/sessions/memstore"
"github.com/gin-gonic/gin"
@ -71,6 +75,10 @@ func New(config *config.Config, logger *logrus.Logger) Server {
engine := gin.New()
store := memstore.NewStore([]byte("authentication-key"), []byte("encryption-keyencryption-key----"))
engine.Use(sessions.Sessions("gotosocial-session", store))
cwd, _ := os.Getwd()
tmPath := filepath.Join(cwd, fmt.Sprintf("%s*", config.TemplateConfig.BaseDir))
logger.Debugf("loading templates from %s", tmPath)
engine.LoadHTMLGlob(tmPath)
return &server{
APIGroup: engine.Group("/api").Group("/v1"),
logger: logger,

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@ -27,25 +27,38 @@
// Config pulls together all the configuration needed to run gotosocial
type Config struct {
LogLevel string `yaml:"logLevel"`
ApplicationName string `yaml:"applicationName"`
DBConfig *DBConfig `yaml:"db"`
LogLevel string `yaml:"logLevel"`
ApplicationName string `yaml:"applicationName"`
DBConfig *DBConfig `yaml:"db"`
TemplateConfig *TemplateConfig `yaml:"template"`
}
// New returns a new config, or an error if something goes amiss.
// The path parameter is optional, for loading a configuration json from the given path.
func New(path string) (*Config, error) {
config := &Config{
DBConfig: &DBConfig{},
}
if path != "" {
var err error
if config, err = loadFromFile(path); err != nil {
return nil, fmt.Errorf("error creating config: %s", err)
}
// FromFile returns a new config from a file, or an error if something goes amiss.
func FromFile(path string) (*Config, error) {
c, err := loadFromFile(path)
if err != nil {
return nil, fmt.Errorf("error creating config: %s", err)
}
return c, nil
}
return config, nil
// Default returns a new config with default values.
// Not yet implemented.
func Default() *Config {
// TODO: find a way of doing this without code repetition, because having to
// repeat all values here and elsewhere is annoying and gonna be prone to mistakes.
return &Config{
DBConfig: &DBConfig{},
TemplateConfig: &TemplateConfig{},
}
}
// Empty just returns an empty config
func Empty() *Config {
return &Config{
DBConfig: &DBConfig{},
TemplateConfig: &TemplateConfig{},
}
}
// loadFromFile takes a path to a yaml file and attempts to load a Config object from it
@ -63,8 +76,8 @@ func loadFromFile(path string) (*Config, error) {
return config, nil
}
// ParseFlags sets flags on the config using the provided Flags object
func (c *Config) ParseFlags(f KeyedFlags) {
// ParseCLIFlags sets flags on the config using the provided Flags object
func (c *Config) ParseCLIFlags(f KeyedFlags) {
fn := GetFlagNames()
// For all of these flags, we only want to set them on the config if:
@ -108,6 +121,11 @@ func (c *Config) ParseFlags(f KeyedFlags) {
if c.DBConfig.Database == "" || f.IsSet(fn.DbDatabase) {
c.DBConfig.Database = f.String(fn.DbDatabase)
}
// template flags
if c.TemplateConfig.BaseDir == "" || f.IsSet(fn.TemplateBaseDir) {
c.TemplateConfig.BaseDir = f.String(fn.TemplateBaseDir)
}
}
// KeyedFlags is a wrapper for any type that can store keyed flags and give them back.
@ -130,6 +148,7 @@ type Flags struct {
DbUser string
DbPassword string
DbDatabase string
TemplateBaseDir string
}
// GetFlagNames returns a struct containing the names of the various flags used for
@ -145,6 +164,7 @@ func GetFlagNames() Flags {
DbUser: "db-user",
DbPassword: "db-password",
DbDatabase: "db-database",
TemplateBaseDir: "template-basedir",
}
}
@ -161,5 +181,6 @@ func GetEnvNames() Flags {
DbUser: "GTS_DB_USER",
DbPassword: "GTS_DB_PASSWORD",
DbDatabase: "GTS_DB_DATABASE",
TemplateBaseDir: "GTS_TEMPLATE_BASEDIR",
}
}

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@ -0,0 +1,25 @@
/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package config
// TemplateConfig pertains to templating of web pages/email notifications and the like
type TemplateConfig struct {
// Directory from which gotosocial will attempt to load html templates (.tmpl files).
BaseDir string `yaml:"baseDir"`
}

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@ -2,67 +2,8 @@
const (
signInHTML = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="//code.jquery.com/jquery-2.2.4.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h1>Login</h1>
<form action="/auth/sign_in" method="POST">
<div class="form-group">
<label for="email">Email</label>
<input type="text" class="form-control" name="username" required placeholder="Please enter your email address">
</div>
<div class="form-group">
<label for="password">Password</label>
<input type="password" class="form-control" name="password" placeholder="Please enter your password">
</div>
<button type="submit" class="btn btn-success">Login</button>
</form>
</div>
</body>
</html>`
`
authorizeHTML = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Auth</title>
<link
rel="stylesheet"
href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"
/>
<script src="//code.jquery.com/jquery-2.2.4.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="jumbotron">
<form action="/oauth/authorize" method="POST">
<h1>Authorize</h1>
<p>The client would like to perform actions on your behalf.</p>
<p>
<button
type="submit"
class="btn btn-primary btn-lg"
style="width:200px;"
>
Allow
</button>
</p>
</form>
</div>
</div>
</body>
</html>`
`
)

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@ -27,6 +27,7 @@
"github.com/go-pg/pg/v10"
"github.com/gotosocial/gotosocial/internal/api"
"github.com/gotosocial/gotosocial/internal/gtsmodel"
"github.com/gotosocial/gotosocial/pkg/mastotypes"
"github.com/gotosocial/oauth2/v4"
"github.com/gotosocial/oauth2/v4/errors"
"github.com/gotosocial/oauth2/v4/manage"
@ -45,16 +46,12 @@ type API struct {
}
type login struct {
Email string `form:"username"`
Email string `form:"username"`
Password string `form:"password"`
}
type authorize struct {
ForceLogin string `form:"force_login,omitempty"`
ResponseType string `form:"response_type"`
ClientID string `form:"client_id"`
RedirectURI string `form:"redirect_uri"`
Scope string `form:"scope,omitempty"`
type code struct {
Code string `form:"code"`
}
func New(ts oauth2.TokenStore, cs oauth2.ClientStore, conn *pg.DB, log *logrus.Logger) *API {
@ -79,6 +76,9 @@ func New(ts oauth2.TokenStore, cs oauth2.ClientStore, conn *pg.DB, log *logrus.L
oauth2.AuthorizationCode,
oauth2.Refreshing,
},
AllowedCodeChallengeMethods: []oauth2.CodeChallengeMethod{
oauth2.CodeChallengePlain,
},
}
srv := server.NewServer(sc, manager)
@ -106,9 +106,13 @@ func New(ts oauth2.TokenStore, cs oauth2.ClientStore, conn *pg.DB, log *logrus.L
func (a *API) AddRoutes(s api.Server) error {
s.AttachHandler(http.MethodGet, "/auth/sign_in", a.SignInGETHandler)
s.AttachHandler(http.MethodPost, "/auth/sign_in", a.SignInPOSTHandler)
s.AttachHandler(http.MethodPost, "/oauth/token", a.TokenHandler)
s.AttachHandler(http.MethodGet, "/oauth/authorize", a.AuthorizeGETHandler)
s.AttachHandler(methodAny, "/auth", a.AuthHandler)
s.AttachHandler(http.MethodPost, "/oauth/authorize", a.AuthorizePOSTHandler)
// s.AttachHandler(http.MethodGet, "/auth", a.AuthGETHandler)
return nil
}
@ -125,7 +129,7 @@ func incorrectPassword() (string, error) {
// The form will then POST to the sign in page, which will be handled by SignInPOSTHandler
func (a *API) SignInGETHandler(c *gin.Context) {
a.log.WithField("func", "SignInGETHandler").Trace("serving sign in html")
c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(signInHTML))
c.HTML(http.StatusOK, "sign-in.tmpl", gin.H{})
}
// SignInPOSTHandler should be served at https://example.org/auth/sign_in.
@ -135,15 +139,16 @@ func (a *API) SignInPOSTHandler(c *gin.Context) {
l := a.log.WithField("func", "SignInPOSTHandler")
s := sessions.Default(c)
form := &login{}
if err := c.ShouldBind(form); err != nil || form.Email == "" || form.Password == "" {
if err := c.ShouldBind(form); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
l.Tracef("parsed form: %+v", form)
userid, err := a.ValidatePassword(form.Email, form.Password);
userid, err := a.ValidatePassword(form.Email, form.Password)
if err != nil {
c.String(http.StatusForbidden, err.Error())
return
}
s.Set("username", userid)
@ -151,11 +156,12 @@ func (a *API) SignInPOSTHandler(c *gin.Context) {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
l.Trace("redirecting to auth page")
c.Redirect(http.StatusFound, "/auth")
c.Redirect(http.StatusFound, "/oauth/authorize")
}
// TokenHandler should be served at https://example.org/oauth/token
// TokenHandler should be served as a POST at https://example.org/oauth/token
// The idea here is to serve an oauth access token to a user, which can be used for authorizing against non-public APIs.
// See https://docs.joinmastodon.org/methods/apps/oauth/#obtain-a-token
func (a *API) TokenHandler(c *gin.Context) {
@ -166,50 +172,61 @@ func (a *API) TokenHandler(c *gin.Context) {
}
}
// AuthorizeHandler should be served as GET at https://example.org/oauth/authorize
// AuthorizeGETHandler should be served as GET at https://example.org/oauth/authorize
// The idea here is to present an oauth authorize page to the user, with a button
// that they have to click to accept. See here: https://docs.joinmastodon.org/methods/apps/oauth/#authorize-a-user
func (a *API) AuthorizeGETHandler(c *gin.Context) {
l := a.log.WithField("func", "AuthorizeHandler")
l := a.log.WithField("func", "AuthorizeGETHandler")
s := sessions.Default(c)
form := &authorize{}
if err := c.ShouldBind(form); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
l.Tracef("parsed form: %+v", form)
if form.ResponseType == "" || form.ClientID == "" || form.RedirectURI == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "missing one of: response_type, client_id or redirect_uri"})
return
}
s.Set("force_login", form.ForceLogin)
s.Set("response_type", form.ResponseType)
s.Set("client_id", form.ClientID)
s.Set("redirect_uri", form.RedirectURI)
s.Set("scope", form.Scope)
if err := s.Save(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
}
v := s.Get("username")
if username, ok := v.(string); !ok || username == "" {
l.Trace("username was empty, redirecting to sign in page")
l.Trace("username was empty, parsing form then redirecting to sign in page")
form := &mastotypes.OAuthAuthorize{}
if err := c.ShouldBind(form); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
l.Tracef("parsed form: %+v", form)
if form.ResponseType == "" || form.ClientID == "" || form.RedirectURI == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "missing one of: response_type, client_id or redirect_uri"})
return
}
// save these values from the form so we can use them elsewhere in the session
s.Set("force_login", form.ForceLogin)
s.Set("response_type", form.ResponseType)
s.Set("client_id", form.ClientID)
s.Set("redirect_uri", form.RedirectURI)
s.Set("scope", form.Scope)
if err := s.Save(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
c.Redirect(http.StatusFound, "/auth/sign_in")
return
}
l.Trace("serving authorize html")
c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(authorizeHTML))
c.HTML(http.StatusOK, "authorize.tmpl", gin.H{})
}
// AuthHandler should be served at https://example.org/auth
func (a *API) AuthHandler(c *gin.Context) {
l := a.log.WithField("func", "AuthHandler")
// AuthorizePOSTHandler should be served as POST at https://example.org/oauth/authorize
// The idea here is to present an oauth authorize page to the user, with a button
// that they have to click to accept. See here: https://docs.joinmastodon.org/methods/apps/oauth/#authorize-a-user
func (a *API) AuthorizePOSTHandler(c *gin.Context) {
l := a.log.WithField("func", "AuthorizePOSTHandler")
s := sessions.Default(c)
v := s.Get("username")
if username, ok := v.(string); !ok || username == "" {
c.JSON(http.StatusUnauthorized, gin.H{"error": "you are not signed in"})
}
values := url.Values{}
if v, ok := s.Get("force_login").(string); !ok {
@ -277,7 +294,13 @@ func (a *API) AuthHandler(c *gin.Context) {
// so that it can be used in further Oauth flows to generate a token/retreieve an oauth client from the db.
func (a *API) ValidatePassword(email string, password string) (userid string, err error) {
l := a.log.WithField("func", "PasswordAuthorizationHandler")
l.Tracef("email %s password %s", email, password)
// make sure an email/password was provided and bail if not
if email == "" || password == "" {
l.Debug("email or password was not provided")
return incorrectPassword()
}
// first we select the user from the database based on email address, bail if no user found for that email
gtsUser := &gtsmodel.User{}
if err := a.conn.Model(gtsUser).Where("email = ?", email).Select(); err != nil {
@ -297,8 +320,7 @@ func (a *API) ValidatePassword(email string, password string) (userid string, er
return incorrectPassword()
}
// If we've made it this far the email/password is correct so we need the oauth client-id of the user
// This is, conveniently, the same as the user ID, so we can just return it.
// If we've made it this far the email/password is correct, so we can just return the id of the user.
userid = gtsUser.ID
l.Tracef("returning (%s, %s)", userid, err)
return

View File

@ -40,17 +40,24 @@ func (suite *OauthTestSuite) SetupSuite() {
suite.testUser = &gtsmodel.User{
ID: userID,
EncryptedPassword: string(encryptedPassword),
Email: "user@localhost",
Email: "user@example.org",
CreatedAt: time.Now(),
UpdatedAt: time.Now(),
AccountID: "some-account-id-it-doesn't-matter-really",
AccountID: "some-account-id-it-doesn't-matter-really-since-this-user-doesn't-actually-have-an-account!",
}
suite.testClient = &oauthClient{
ID: "a-known-client-id",
Secret: "some-secret",
Domain: "http://localhost:8080",
Domain: "https://example.org",
UserID: userID,
}
// because go tests are run within the test package directory, we need to fiddle with the templateconfig
// basedir in a way that we wouldn't normally have to do when running the binary, in order to make
// the templates actually load
c := config.Empty()
c.TemplateConfig.BaseDir = "../../web/template/"
suite.config = c
}
// SetupTest creates a postgres connection and creates the oauth_clients table before each test
@ -114,7 +121,7 @@ func (suite *OauthTestSuite) TestAPIInitialize() {
api.AddRoutes(r)
go r.Start()
time.Sleep(30 * time.Second)
// http://localhost:8080/oauth/authorize?client_id=a-known-client-id&redirect_uri=''&response_type=code
// http://localhost:8080/oauth/authorize?client_id=a-known-client-id&response_type=code&redirect_uri=https://example.org
}
func TestOauthTestSuite(t *testing.T) {

37
pkg/mastotypes/oauth.go Normal file
View File

@ -0,0 +1,37 @@
/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package mastotypes
// OAuthAuthorize represents a request sent to https://example.org/oauth/authorize
// See here: https://docs.joinmastodon.org/methods/apps/oauth/
type OAuthAuthorize struct {
// Forces the user to re-login, which is necessary for authorizing with multiple accounts from the same instance.
ForceLogin string `form:"force_login,omitempty"`
// Should be set equal to `code`.
ResponseType string `form:"response_type"`
// Client ID, obtained during app registration.
ClientID string `form:"client_id"`
// Set a URI to redirect the user to.
// If this parameter is set to urn:ietf:wg:oauth:2.0:oob then the authorization code will be shown instead.
// Must match one of the redirect URIs declared during app registration.
RedirectURI string `form:"redirect_uri"`
// List of requested OAuth scopes, separated by spaces (or by pluses, if using query parameters).
// Must be a subset of scopes declared during app registration. If not provided, defaults to read.
Scope string `form:"scope,omitempty"`
}

View File

@ -0,0 +1,33 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Auth</title>
<link
rel="stylesheet"
href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"
/>
<script src="//code.jquery.com/jquery-2.2.4.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="jumbotron">
<form action="/oauth/authorize" method="POST">
<h1>Authorize</h1>
<p>The client would like to perform actions on your behalf.</p>
<p>
<button
type="submit"
class="btn btn-primary btn-lg"
style="width:200px;"
>
Allow
</button>
</p>
</form>
</div>
</div>
</body>
</html>

28
web/template/sign-in.tmpl Normal file
View File

@ -0,0 +1,28 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="//code.jquery.com/jquery-2.2.4.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h1>Login</h1>
<form action="/auth/sign_in" method="POST">
<div class="form-group">
<label for="email">Email</label>
<input type="text" class="form-control" name="username" required placeholder="Please enter your email address">
</div>
<div class="form-group">
<label for="password">Password</label>
<input type="password" class="form-control" name="password" placeholder="Please enter your password">
</div>
<button type="submit" class="btn btn-success">Login</button>
</form>
</div>
</body>
</html>