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, 155 insertions, 0 deletions

diff --git a/internal/apimodule/account/accountcreate.go b/internal/apimodule/account/accountcreate.go
new file mode 100644
index 000000000..58b98c0e4
--- /dev/null
+++ b/internal/apimodule/account/accountcreate.go
@@ -0,0 +1,155 @@
+/*
+   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 account
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"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/util"
+	"github.com/superseriousbusiness/gotosocial/pkg/mastotypes"
+	"github.com/superseriousbusiness/oauth2/v4"
+)
+
+// accountCreatePOSTHandler handles create account requests, validates them,
+// and puts them in the database if they're valid.
+// It should be served as a POST at /api/v1/accounts
+func (m *accountModule) accountCreatePOSTHandler(c *gin.Context) {
+	l := m.log.WithField("func", "accountCreatePOSTHandler")
+	authed, err := oauth.MustAuth(c, true, true, false, false)
+	if err != nil {
+		l.Debugf("couldn't auth: %s", err)
+		c.JSON(http.StatusForbidden, gin.H{"error": err.Error()})
+		return
+	}
+
+	l.Trace("parsing request form")
+	form := &mastotypes.AccountCreateRequest{}
+	if err := c.ShouldBind(form); err != nil || form == nil {
+		l.Debugf("could not parse form from request: %s", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "missing one or more required form values"})
+		return
+	}
+
+	l.Tracef("validating form %+v", form)
+	if err := validateCreateAccount(form, m.config.AccountsConfig, m.db); err != nil {
+		l.Debugf("error validating form: %s", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	clientIP := c.ClientIP()
+	l.Tracef("attempting to parse client ip address %s", clientIP)
+	signUpIP := net.ParseIP(clientIP)
+	if signUpIP == nil {
+		l.Debugf("error validating sign up ip address %s", clientIP)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "ip address could not be parsed from request"})
+		return
+	}
+
+	ti, err := m.accountCreate(form, signUpIP, authed.Token, authed.Application)
+	if err != nil {
+		l.Errorf("internal server error while creating new account: %s", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, ti)
+}
+
+// accountCreate does the dirty work of making an account and user in the database.
+// It then returns a token to the caller, for use with the new account, as per the
+// spec here: https://docs.joinmastodon.org/methods/accounts/
+func (m *accountModule) accountCreate(form *mastotypes.AccountCreateRequest, signUpIP net.IP, token oauth2.TokenInfo, app *model.Application) (*mastotypes.Token, error) {
+	l := m.log.WithField("func", "accountCreate")
+
+	// don't store a reason if we don't require one
+	reason := form.Reason
+	if !m.config.AccountsConfig.ReasonRequired {
+		reason = ""
+	}
+
+	l.Trace("creating new username and account")
+	user, err := m.db.NewSignup(form.Username, reason, m.config.AccountsConfig.RequireApproval, form.Email, form.Password, signUpIP, form.Locale, app.ID)
+	if err != nil {
+		return nil, fmt.Errorf("error creating new signup in the database: %s", err)
+	}
+
+	l.Tracef("generating a token for user %s with account %s and application %s", user.ID, user.AccountID, app.ID)
+	accessToken, err := m.oauthServer.GenerateUserAccessToken(token, app.ClientSecret, user.ID)
+	if err != nil {
+		return nil, fmt.Errorf("error creating new access token for user %s: %s", user.ID, err)
+	}
+
+	return &mastotypes.Token{
+		AccessToken: accessToken.GetAccess(),
+		TokenType:   "Bearer",
+		Scope:       accessToken.GetScope(),
+		CreatedAt:   accessToken.GetAccessCreateAt().Unix(),
+	}, nil
+}
+
+// validateCreateAccount checks through all the necessary prerequisites for creating a new account,
+// according to the provided account create request. If the account isn't eligible, an error will be returned.
+func validateCreateAccount(form *mastotypes.AccountCreateRequest, c *config.AccountsConfig, database db.DB) error {
+	if !c.OpenRegistration {
+		return errors.New("registration is not open for this server")
+	}
+
+	if err := util.ValidateUsername(form.Username); err != nil {
+		return err
+	}
+
+	if err := util.ValidateEmail(form.Email); err != nil {
+		return err
+	}
+
+	if err := util.ValidateNewPassword(form.Password); err != nil {
+		return err
+	}
+
+	if !form.Agreement {
+		return errors.New("agreement to terms and conditions not given")
+	}
+
+	if err := util.ValidateLanguage(form.Locale); err != nil {
+		return err
+	}
+
+	if err := util.ValidateSignUpReason(form.Reason, c.ReasonRequired); err != nil {
+		return err
+	}
+
+	if err := database.IsEmailAvailable(form.Email); err != nil {
+		return err
+	}
+
+	if err := database.IsUsernameAvailable(form.Username); err != nil {
+		return err
+	}
+
+	return nil
+}