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Api/v1/accounts (#8)

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* start work on accounts module

* plodding away on the accounts endpoint

* groundwork for other account routes

* add password validator

* validation utils

* require account approval flags

* comments

* comments

* go fmt

* comments

* add distributor stub

* rename api to federator

* tidy a bit

* validate new account requests

* rename r router

* comments

* add domain blocks

* add some more shortcuts

* add some more shortcuts

* check email + username availability

* email block checking for signups

* chunking away at it

* tick off a few more things

* some fiddling with tests

* add mock package

* relocate repo

* move mocks around

* set app id on new signups

* initialize oauth server properly

* rename oauth server

* proper mocking tests

* go fmt ./...

* add required fields

* change name of func

* move validation to account.go

* more tests!

* add some file utility tools

* add mediaconfig

* new shortcut

* add some more fields

* add followrequest model

* add notify

* update mastotypes

* mock out storage interface

* start building media interface

* start on update credentials

* mess about with media a bit more

* test image manipulation

* media more or less working

* account update nearly working

* rearranging my package ;) ;) ;)

* phew big stuff!!!!

* fix type checking

* *fiddles*

* Add CreateTables func

* account registration flow working

* tidy

* script to step through auth flow

* add a lil helper for generating user uris

* fiddling with federation a bit

* update progress

* Tidying and linting
This commit is contained in:
Tobi Smethurst
2021-04-01 20:46:45 +02:00
committed by GitHub
parent aa9ce272dc
commit 71a49e2b43
94 changed files with 6585 additions and 955 deletions
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5
internal/apimodule/auth/README.md Normal file
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# auth
This package provides uses the [GoToSocial oauth2](https://github.com/gotosocial/oauth2) module (forked from [go-oauth2](https://github.com/go-oauth2/oauth2)) to provide [oauth2](https://www.oauth.com/) functionality to the GoToSocial client API.
It also provides a handler/middleware for attaching to the Gin engine for validating authenticated users.

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internal/apimodule/auth/auth.go Normal file
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/*
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 auth is a module that provides oauth functionality to a router.
// It adds the following paths:
// /auth/sign_in
// /oauth/token
// /oauth/authorize
// It also includes the oauthTokenMiddleware, which can be attached to a router to authenticate every request by Bearer token.
package auth
import (
"fmt"
"net/http"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/apimodule"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/db/model"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
"github.com/superseriousbusiness/gotosocial/internal/router"
)
const (
authSignInPath = "/auth/sign_in"
oauthTokenPath = "/oauth/token"
oauthAuthorizePath = "/oauth/authorize"
)
type authModule struct {
server oauth.Server
db db.DB
log *logrus.Logger
}
// New returns a new auth module
func New(srv oauth.Server, db db.DB, log *logrus.Logger) apimodule.ClientAPIModule {
return &authModule{
server: srv,
db: db,
log: log,
}
}
// Route satisfies the RESTAPIModule interface
func (m *authModule) Route(s router.Router) error {
s.AttachHandler(http.MethodGet, authSignInPath, m.signInGETHandler)
s.AttachHandler(http.MethodPost, authSignInPath, m.signInPOSTHandler)
s.AttachHandler(http.MethodPost, oauthTokenPath, m.tokenPOSTHandler)
s.AttachHandler(http.MethodGet, oauthAuthorizePath, m.authorizeGETHandler)
s.AttachHandler(http.MethodPost, oauthAuthorizePath, m.authorizePOSTHandler)
s.AttachMiddleware(m.oauthTokenMiddleware)
return nil
}
func (m *authModule) CreateTables(db db.DB) error {
models := []interface{}{
&oauth.Client{},
&oauth.Token{},
&model.User{},
&model.Account{},
&model.Application{},
}
for _, m := range models {
if err := db.CreateTable(m); err != nil {
return fmt.Errorf("error creating table: %s", err)
}
}
return nil
}

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/*
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 auth
import (
"context"
"fmt"
"testing"
"time"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
"github.com/stretchr/testify/suite"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/db/model"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
"github.com/superseriousbusiness/gotosocial/internal/router"
"golang.org/x/crypto/bcrypt"
)
type AuthTestSuite struct {
suite.Suite
oauthServer oauth.Server
db db.DB
testAccount *model.Account
testApplication *model.Application
testUser *model.User
testClient *oauth.Client
config *config.Config
}
// SetupSuite sets some variables on the suite that we can use as consts (more or less) throughout
func (suite *AuthTestSuite) SetupSuite() {
c := config.Empty()
// we're running on localhost without https so set the protocol to http
c.Protocol = "http"
// just for testing
c.Host = "localhost:8080"
// 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.TemplateConfig.BaseDir = "../../../web/template/"
c.DBConfig = &config.DBConfig{
Type: "postgres",
Address: "localhost",
Port: 5432,
User: "postgres",
Password: "postgres",
Database: "postgres",
ApplicationName: "gotosocial",
}
suite.config = c
encryptedPassword, err := bcrypt.GenerateFromPassword([]byte("password"), bcrypt.DefaultCost)
if err != nil {
logrus.Panicf("error encrypting user pass: %s", err)
}
acctID := uuid.NewString()
suite.testAccount = &model.Account{
ID: acctID,
Username: "test_user",
}
suite.testUser = &model.User{
EncryptedPassword: string(encryptedPassword),
Email: "user@example.org",
AccountID: acctID,
}
suite.testClient = &oauth.Client{
ID: "a-known-client-id",
Secret: "some-secret",
Domain: fmt.Sprintf("%s://%s", c.Protocol, c.Host),
}
suite.testApplication = &model.Application{
Name: "a test application",
Website: "https://some-application-website.com",
RedirectURI: "http://localhost:8080",
ClientID: "a-known-client-id",
ClientSecret: "some-secret",
Scopes: "read",
VapidKey: uuid.NewString(),
}
}
// SetupTest creates a postgres connection and creates the oauth_clients table before each test
func (suite *AuthTestSuite) SetupTest() {
log := logrus.New()
log.SetLevel(logrus.TraceLevel)
db, err := db.New(context.Background(), suite.config, log)
if err != nil {
logrus.Panicf("error creating database connection: %s", err)
}
suite.db = db
models := []interface{}{
&oauth.Client{},
&oauth.Token{},
&model.User{},
&model.Account{},
&model.Application{},
}
for _, m := range models {
if err := suite.db.CreateTable(m); err != nil {
logrus.Panicf("db connection error: %s", err)
}
}
suite.oauthServer = oauth.New(suite.db, log)
if err := suite.db.Put(suite.testAccount); err != nil {
logrus.Panicf("could not insert test account into db: %s", err)
}
if err := suite.db.Put(suite.testUser); err != nil {
logrus.Panicf("could not insert test user into db: %s", err)
}
if err := suite.db.Put(suite.testClient); err != nil {
logrus.Panicf("could not insert test client into db: %s", err)
}
if err := suite.db.Put(suite.testApplication); err != nil {
logrus.Panicf("could not insert test application into db: %s", err)
}
}
// TearDownTest drops the oauth_clients table and closes the pg connection after each test
func (suite *AuthTestSuite) TearDownTest() {
models := []interface{}{
&oauth.Client{},
&oauth.Token{},
&model.User{},
&model.Account{},
&model.Application{},
}
for _, m := range models {
if err := suite.db.DropTable(m); err != nil {
logrus.Panicf("error dropping table: %s", err)
}
}
if err := suite.db.Stop(context.Background()); err != nil {
logrus.Panicf("error closing db connection: %s", err)
}
suite.db = nil
}
func (suite *AuthTestSuite) TestAPIInitialize() {
log := logrus.New()
log.SetLevel(logrus.TraceLevel)
r, err := router.New(suite.config, log)
if err != nil {
suite.FailNow(fmt.Sprintf("error mapping routes onto router: %s", err))
}
api := New(suite.oauthServer, suite.db, log)
if err := api.Route(r); err != nil {
suite.FailNow(fmt.Sprintf("error mapping routes onto router: %s", err))
}
r.Start()
time.Sleep(60 * time.Second)
if err := r.Stop(context.Background()); err != nil {
suite.FailNow(fmt.Sprintf("error stopping router: %s", err))
}
}
func TestAuthTestSuite(t *testing.T) {
suite.Run(t, new(AuthTestSuite))
}

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/*
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 auth
import (
"errors"
"fmt"
"net/http"
"net/url"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db/model"
"github.com/superseriousbusiness/gotosocial/pkg/mastotypes"
)
// 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 (m *authModule) authorizeGETHandler(c *gin.Context) {
l := m.log.WithField("func", "AuthorizeGETHandler")
s := sessions.Default(c)
// UserID will be set in the session by AuthorizePOSTHandler if the caller has already gone through the authentication flow
// If it's not set, then we don't know yet who the user is, so we need to redirect them to the sign in page.
userID, ok := s.Get("userid").(string)
if !ok || userID == "" {
l.Trace("userid was empty, parsing form then redirecting to sign in page")
if err := parseAuthForm(c, l); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
} else {
c.Redirect(http.StatusFound, authSignInPath)
}
return
}
// We can use the client_id on the session to retrieve info about the app associated with the client_id
clientID, ok := s.Get("client_id").(string)
if !ok || clientID == "" {
c.JSON(http.StatusInternalServerError, gin.H{"error": "no client_id found in session"})
return
}
app := &model.Application{
ClientID: clientID,
}
if err := m.db.GetWhere("client_id", app.ClientID, app); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("no application found for client id %s", clientID)})
return
}
// we can also use the userid of the user to fetch their username from the db to greet them nicely <3
user := &model.User{
ID: userID,
}
if err := m.db.GetByID(user.ID, user); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
acct := &model.Account{
ID: user.AccountID,
}
if err := m.db.GetByID(acct.ID, acct); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
// Finally we should also get the redirect and scope of this particular request, as stored in the session.
redirect, ok := s.Get("redirect_uri").(string)
if !ok || redirect == "" {
c.JSON(http.StatusInternalServerError, gin.H{"error": "no redirect_uri found in session"})
return
}
scope, ok := s.Get("scope").(string)
if !ok || scope == "" {
c.JSON(http.StatusInternalServerError, gin.H{"error": "no scope found in session"})
return
}
// the authorize template will display a form to the user where they can get some information
// about the app that's trying to authorize, and the scope of the request.
// They can then approve it if it looks OK to them, which will POST to the AuthorizePOSTHandler
l.Trace("serving authorize html")
c.HTML(http.StatusOK, "authorize.tmpl", gin.H{
"appname": app.Name,
"appwebsite": app.Website,
"redirect": redirect,
"scope": scope,
"user": acct.Username,
})
}
// authorizePOSTHandler should be served as POST at https://example.org/oauth/authorize
// At this point we assume that the user has A) logged in and B) accepted that the app should act for them,
// so we should proceed with the authentication flow and generate an oauth token for them if we can.
// See here: https://docs.joinmastodon.org/methods/apps/oauth/#authorize-a-user
func (m *authModule) authorizePOSTHandler(c *gin.Context) {
l := m.log.WithField("func", "AuthorizePOSTHandler")
s := sessions.Default(c)
// At this point we know the user has said 'yes' to allowing the application and oauth client
// work for them, so we can set the
// We need to retrieve the original form submitted to the authorizeGEThandler, and
// recreate it on the request so that it can be used further by the oauth2 library.
// So first fetch all the values from the session.
forceLogin, ok := s.Get("force_login").(string)
if !ok {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing force_login"})
return
}
responseType, ok := s.Get("response_type").(string)
if !ok || responseType == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing response_type"})
return
}
clientID, ok := s.Get("client_id").(string)
if !ok || clientID == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing client_id"})
return
}
redirectURI, ok := s.Get("redirect_uri").(string)
if !ok || redirectURI == "" {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing redirect_uri"})
return
}
scope, ok := s.Get("scope").(string)
if !ok {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing scope"})
return
}
userID, ok := s.Get("userid").(string)
if !ok {
c.JSON(http.StatusBadRequest, gin.H{"error": "session missing userid"})
return
}
// we're done with the session so we can clear it now
s.Clear()
// now set the values on the request
values := url.Values{}
values.Set("force_login", forceLogin)
values.Set("response_type", responseType)
values.Set("client_id", clientID)
values.Set("redirect_uri", redirectURI)
values.Set("scope", scope)
values.Set("userid", userID)
c.Request.Form = values
l.Tracef("values on request set to %+v", c.Request.Form)
// and proceed with authorization using the oauth2 library
if err := m.server.HandleAuthorizeRequest(c.Writer, c.Request); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
}
}
// parseAuthForm parses the OAuthAuthorize form in the gin context, and stores
// the values in the form into the session.
func parseAuthForm(c *gin.Context, l *logrus.Entry) error {
s := sessions.Default(c)
// first make sure they've filled out the authorize form with the required values
form := &mastotypes.OAuthAuthorize{}
if err := c.ShouldBind(form); err != nil {
return err
}
l.Tracef("parsed form: %+v", form)
// these fields are *required* so check 'em
if form.ResponseType == "" || form.ClientID == "" || form.RedirectURI == "" {
return errors.New("missing one of: response_type, client_id or redirect_uri")
}
// set default scope to read
if form.Scope == "" {
form.Scope = "read"
}
// 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)
return s.Save()
}

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/*
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 auth
import (
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/db/model"
"github.com/superseriousbusiness/gotosocial/internal/oauth"
)
// oauthTokenMiddleware checks if the client has presented a valid oauth Bearer token.
// If so, it will check the User that the token belongs to, and set that in the context of
// the request. Then, it will look up the account for that user, and set that in the request too.
// If user or account can't be found, then the handler won't *fail*, in case the server wants to allow
// public requests that don't have a Bearer token set (eg., for public instance information and so on).
func (m *authModule) oauthTokenMiddleware(c *gin.Context) {
l := m.log.WithField("func", "ValidatePassword")
l.Trace("entering OauthTokenMiddleware")
ti, err := m.server.ValidationBearerToken(c.Request)
if err != nil {
l.Trace("no valid token presented: continuing with unauthenticated request")
return
}
c.Set(oauth.SessionAuthorizedToken, ti)
l.Tracef("set gin context %s to %+v", oauth.SessionAuthorizedToken, ti)
// check for user-level token
if uid := ti.GetUserID(); uid != "" {
l.Tracef("authenticated user %s with bearer token, scope is %s", uid, ti.GetScope())
// fetch user's and account for this user id
user := &model.User{}
if err := m.db.GetByID(uid, user); err != nil || user == nil {
l.Warnf("no user found for validated uid %s", uid)
return
}
c.Set(oauth.SessionAuthorizedUser, user)
l.Tracef("set gin context %s to %+v", oauth.SessionAuthorizedUser, user)
acct := &model.Account{}
if err := m.db.GetByID(user.AccountID, acct); err != nil || acct == nil {
l.Warnf("no account found for validated user %s", uid)
return
}
c.Set(oauth.SessionAuthorizedAccount, acct)
l.Tracef("set gin context %s to %+v", oauth.SessionAuthorizedAccount, acct)
}
// check for application token
if cid := ti.GetClientID(); cid != "" {
l.Tracef("authenticated client %s with bearer token, scope is %s", cid, ti.GetScope())
app := &model.Application{}
if err := m.db.GetWhere("client_id", cid, app); err != nil {
l.Tracef("no app found for client %s", cid)
}
c.Set(oauth.SessionAuthorizedApplication, app)
l.Tracef("set gin context %s to %+v", oauth.SessionAuthorizedApplication, app)
}
}

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/*
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 auth
import (
"errors"
"net/http"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/db/model"
"golang.org/x/crypto/bcrypt"
)
type login struct {
Email string `form:"username"`
Password string `form:"password"`
}
// signInGETHandler should be served at https://example.org/auth/sign_in.
// The idea is to present a sign in page to the user, where they can enter their username and password.
// The form will then POST to the sign in page, which will be handled by SignInPOSTHandler
func (m *authModule) signInGETHandler(c *gin.Context) {
m.log.WithField("func", "SignInGETHandler").Trace("serving sign in html")
c.HTML(http.StatusOK, "sign-in.tmpl", gin.H{})
}
// signInPOSTHandler should be served at https://example.org/auth/sign_in.
// The idea is to present a sign in page to the user, where they can enter their username and password.
// The handler will then redirect to the auth handler served at /auth
func (m *authModule) signInPOSTHandler(c *gin.Context) {
l := m.log.WithField("func", "SignInPOSTHandler")
s := sessions.Default(c)
form := &login{}
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 := m.validatePassword(form.Email, form.Password)
if err != nil {
c.String(http.StatusForbidden, err.Error())
return
}
s.Set("userid", userid)
if err := s.Save(); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
return
}
l.Trace("redirecting to auth page")
c.Redirect(http.StatusFound, oauthAuthorizePath)
}
// validatePassword takes an email address and a password.
// The goal is to authenticate the password against the one for that email
// address stored in the database. If OK, we return the userid (a uuid) for that user,
// so that it can be used in further Oauth flows to generate a token/retreieve an oauth client from the db.
func (m *authModule) validatePassword(email string, password string) (userid string, err error) {
l := m.log.WithField("func", "ValidatePassword")
// 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 := &model.User{}
if err := m.db.GetWhere("email", email, gtsUser); err != nil {
l.Debugf("user %s was not retrievable from db during oauth authorization attempt: %s", email, err)
return incorrectPassword()
}
// make sure a password is actually set and bail if not
if gtsUser.EncryptedPassword == "" {
l.Warnf("encrypted password for user %s was empty for some reason", gtsUser.Email)
return incorrectPassword()
}
// compare the provided password with the encrypted one from the db, bail if they don't match
if err := bcrypt.CompareHashAndPassword([]byte(gtsUser.EncryptedPassword), []byte(password)); err != nil {
l.Debugf("password hash didn't match for user %s during login attempt: %s", gtsUser.Email, err)
return incorrectPassword()
}
// 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
}
// incorrectPassword is just a little helper function to use in the ValidatePassword function
func incorrectPassword() (string, error) {
return "", errors.New("password/email combination was incorrect")
}

36
internal/apimodule/auth/token.go Normal file
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@ -0,0 +1,36 @@
/*
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 auth
import (
"net/http"
"github.com/gin-gonic/gin"
)
// tokenPOSTHandler 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 (m *authModule) tokenPOSTHandler(c *gin.Context) {
l := m.log.WithField("func", "TokenPOSTHandler")
l.Trace("entered TokenPOSTHandler")
if err := m.server.HandleTokenRequest(c.Writer, c.Request); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
}
}