Api/v1/accounts (#8)

* 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

1 files changed, 115 insertions, 0 deletions

diff --git a/internal/apimodule/auth/signin.go b/internal/apimodule/auth/signin.go
new file mode 100644
index 000000000..34146cbfc
--- /dev/null
+++ b/internal/apimodule/auth/signin.go
@@ -0,0 +1,115 @@
+/*
+   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")
+}