/
main.go
668 lines (583 loc) · 18 KB
/
main.go
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package main
import (
"bufio"
"context"
"database/sql"
"errors"
"flag"
"fmt"
"log"
"math/rand"
"net/http"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"time"
"github.com/discuitnet/discuit/config"
"github.com/discuitnet/discuit/core"
"github.com/discuitnet/discuit/internal/images"
"github.com/discuitnet/discuit/internal/uid"
"github.com/discuitnet/discuit/internal/utils"
"github.com/discuitnet/discuit/server"
"github.com/go-sql-driver/mysql"
"github.com/gomodule/redigo/redis"
gomigrate "github.com/golang-migrate/migrate/v4"
_ "github.com/golang-migrate/migrate/v4/database/mysql"
_ "github.com/golang-migrate/migrate/v4/source/file"
)
func main() {
// Load config file.
conf, err := config.Parse("./config.yaml")
if err != nil {
log.Fatal("Error parsing config file: ", err)
}
// Connect to MariaDB.
db := openDatabase(conf.DBAddr, conf.DBUser, conf.DBPassword, conf.DBName)
defer db.Close()
flags, err := parseFlags()
if err != nil {
log.Fatal("Error parsing falgs: ", err)
}
runServer, err := runFlagCommands(db, conf, flags)
if err != nil {
log.Fatal("Error running flag commands: ", err)
}
hasMoreCommandsToRun := flags.deleteUser != "" // commands that require the server.Server object
if !runServer && !hasMoreCommandsToRun {
return // Nothing to do
}
if !flags.runMigrations && runServer {
if err := createGhostUser(db); err != nil {
os.Exit(-1)
}
}
// Set images folder.
p := "images"
if conf.ImagesFolderPath != "" {
p = conf.ImagesFolderPath
}
if p, err = filepath.Abs(p); err != nil {
log.Fatalf("Error attempting to set the images folder location (%s): %v", p, err)
}
images.SetImagesRootFolder(p)
// Create default badges.
if err = core.NewBadgeType(db, "supporter"); err != nil {
log.Fatalf("Error creating 'supporter' user badge: %v\n", err)
}
site, err := server.New(db, conf)
if err != nil {
log.Fatal("Error creating server: ", err)
}
defer site.Close()
if flags.deleteUser != "" {
if ok := cliYesConfirmCommand(); !ok {
log.Fatal("Cannot continue without a YES.")
}
user, err := core.GetUserByUsername(context.Background(), db, flags.deleteUser, nil)
if err != nil {
log.Fatal(err)
}
if err := site.LogoutAllSessionsOfUser(user); err != nil {
log.Fatal(err)
}
if err := user.Delete(context.Background()); err != nil {
log.Fatal(err)
}
log.Printf("%s successfully deleted\n", user.Username)
}
if !runServer {
return // Nothing to do.
}
go func() {
// This go-routine runs a set of periodic functions every hour.
time.Sleep(time.Second * 5) // Just so the first console output isn't from this goroutine.
for {
if err := core.PurgePostsFromTempTables(context.TODO(), db); err != nil {
log.Printf("Temp posts purging failed: %v\n", err)
}
if n, err := core.RemoveTempImages(context.TODO(), db); err != nil {
log.Printf("Failed to remove temp images: %v\n", err)
} else {
log.Printf("Removed %d temp images\n", n)
}
time.Sleep(time.Hour)
}
}()
var https bool = conf.CertFile != ""
server := &http.Server{
Addr: conf.Addr,
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// If the domain name contains www. redirect to one without.
host := r.Host
if strings.HasPrefix(host, "www.") {
url := *r.URL
url.Host = host[4:]
if https {
url.Scheme = "https"
} else {
url.Scheme = "http"
}
http.Redirect(w, r, url.String(), http.StatusMovedPermanently)
return
}
site.ServeHTTP(w, r)
}),
}
log.Println("Starting server on " + conf.Addr)
if https {
// Running HTTPS server.
//
// A server to redirect traffic from HTTP to HTTPS. Started only if the
// main server is on port 443.
if conf.Addr[strings.Index(conf.Addr, ":"):] == ":443" {
redirectServer := &http.Server{
Addr: ":80",
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
url := *r.URL
url.Scheme = "https"
url.Host = r.Host
http.Redirect(w, r, url.String(), http.StatusMovedPermanently)
}),
}
go func() {
if err = redirectServer.ListenAndServe(); err != nil {
log.Fatal("Error starting redirect server: ", err)
}
}()
}
if err := server.ListenAndServeTLS(conf.CertFile, conf.KeyFile); err != nil {
log.Fatal("Error starting server (TLS): ", err)
}
} else {
// Running HTTP server.
if err := server.ListenAndServe(); err != nil {
log.Fatal("Error starting server: ", err)
}
}
}
// migrationLogger implements the migrate.Logger interface.
type migrationsLogger struct {
verbose bool
}
func (ml *migrationsLogger) Printf(format string, v ...any) {
log.Printf(format, v...)
}
func (ml *migrationsLogger) Verbose() bool {
return ml.verbose
}
// If steps is 0, all migrations are run. Otherwise, steps migrations are run up
// or down depending on steps > 0 or not.
func migrate(c *config.Config, log bool, steps int) error {
fmt.Println("Running migrations")
m, err := gomigrate.New("file://migrations/", "mysql://"+mysqlDSN(c.DBAddr, c.DBUser, c.DBPassword, c.DBName))
if err != nil {
return err
}
if log {
m.Log = &migrationsLogger{verbose: false}
}
if steps == 0 {
err = m.Up()
} else {
err = m.Steps(steps)
}
if err != nil && err != gomigrate.ErrNoChange {
return err
}
_, err = m.Close()
return err
}
type flags struct {
runServer bool
runMigrations bool
steps int // migrations steps
hardReset bool
makeAdmin string // user to make admin
removeAdmin string // user to remove as admin
makeMod string // user to make a mod of community
removeMod string // user to remove as mod of community
community string
populatePost string // post to populate with generated comments
numComments int // number of comments to populate in post
forcePassChange string // user to change the password of
password string
username string
printImagePath string // print the path of image stored on disk
fixHotness bool
addAllUsersToCommunity string
newBadge string
deleteUser string
}
func parseFlags() (*flags, error) {
f := &flags{}
flag.BoolVar(&f.runMigrations, "migrate", false, "Run database migrations")
flag.IntVar(&f.steps, "steps", 0, "Migrations steps to run (0 runs all migrations, and value can be nagative)")
flag.BoolVar(&f.runServer, "serve", false, "Start web server")
flag.StringVar(&f.makeAdmin, "make-admin", "", "Make user an admin")
flag.StringVar(&f.removeAdmin, "remove-admin", "", "Remove user as admin")
flag.StringVar(&f.makeMod, "make-mod", "", "Make user a moderator") // Uses -community flag
flag.StringVar(&f.removeMod, "remove-mod", "", "Remove user as moderator") // Uses -community flag
flag.StringVar(&f.community, "community", "", "Community name") // Helper flag
flag.StringVar(&f.username, "user", "", "Username") // Helper flag
flag.BoolVar(&f.hardReset, "hard-reset", false, "Hard reset")
flag.StringVar(&f.forcePassChange, "force-pass-change", "", "Change user password") // Uses -user flag
flag.StringVar(&f.password, "password", "", "Password") // Helper flag for -force-pass-change
flag.StringVar(&f.printImagePath, "image-path", "", "Show where an image is stored on disk.")
flag.StringVar(&f.populatePost, "populate-post", "", "Populate post with random comments") // Populate post with random comments
flag.IntVar(&f.numComments, "num-comments", 100, "No of comments") // Helper flag for -populate-post
flag.BoolVar(&f.fixHotness, "fix-hotness", false, "Fix hotness of all posts")
flag.StringVar(&f.addAllUsersToCommunity, "add-all-users-to-community", "", "Add all users to community") // Uses -community flag
flag.StringVar(&f.newBadge, "new-badge", "", "New user badge")
flag.StringVar(&f.deleteUser, "delete-user", "", "Delete a user.")
flag.Parse()
return f, nil
}
// If returns false, the program should exit immeditately afterwords, even if
// there was no error.
func runFlagCommands(db *sql.DB, conf *config.Config, flags *flags) (bool, error) {
ctx := context.Background()
if flags.fixHotness {
if err := core.UpdateAllPostsHotness(ctx, db); err != nil {
return false, err
}
return false, nil
}
if flags.hardReset {
if err := db.Close(); err != nil {
return false, err
}
if err := hardReset(conf); err != nil {
return false, fmt.Errorf("failed to hard reset: %w", err)
}
return false, nil
}
if flags.runMigrations {
if err := migrate(conf, true, flags.steps); err != nil {
return false, err
}
log.Println("Migrations ran successfully.")
}
// New-migration command:
if func() bool {
for _, arg := range os.Args[1:] {
if arg == "new-migration" {
return true
}
}
return false
}() {
folder, err := os.Open("./migrations/")
if err != nil {
return false, err
}
files, err := folder.Readdirnames(0)
if err != nil {
return false, err
}
sort.Strings(files)
last := files[len(files)-1]
n := strings.Index(last, "_")
if n < 0 {
return false, errors.New("no underscore found in last filename")
}
lastVersion, err := strconv.Atoi(last[0:n])
if err != nil {
return false, err
}
scanner := bufio.NewScanner(os.Stdin)
fmt.Print("New migration name: ")
scanner.Scan()
name := strings.TrimSpace(scanner.Text())
if name == "" {
return false, errors.New("migration name cannot be empty")
}
newVersion := strconv.Itoa(lastVersion + 1)
for i := len(newVersion); i < 4; i++ {
newVersion = "0" + newVersion
}
name = newVersion + "_" + strings.ToLower(strings.ReplaceAll(name, " ", "_"))
newFiles := []string{name + ".down.sql", name + ".up.sql"}
for _, name := range newFiles {
file, err := os.Create("./migrations/" + name)
if err != nil {
return false, err
}
if err := file.Close(); err != nil {
return false, err
}
}
return false, nil
}
if flags.makeAdmin != "" {
user, err := core.MakeAdmin(ctx, db, flags.makeAdmin, true)
if err != nil {
return false, fmt.Errorf("failed to make %s an admin: %w", flags.makeAdmin, err)
}
log.Printf("User %s is now an admin\n", user.Username)
return false, nil
}
if flags.removeAdmin != "" {
user, err := core.MakeAdmin(ctx, db, flags.removeAdmin, false)
if err != nil {
return false, fmt.Errorf("failed to remove %s as an admin: %w", flags.removeAdmin, err)
}
log.Printf("User %s is no longer an admin", user.Username)
return false, nil
}
if flags.makeMod != "" || flags.removeMod != "" {
community, err := core.GetCommunityByName(ctx, db, flags.community, nil)
if err != nil {
return false, err
}
if flags.makeMod != "" {
user, err := core.GetUserByUsername(ctx, db, flags.makeMod, nil)
if err != nil {
return false, err
}
if err = core.MakeUserModCLI(db, community, user.ID, true); err != nil {
return false, err
}
log.Printf("%s is now a moderator of %s\n", user.Username, community.Name)
}
if flags.removeMod != "" {
user, err := core.GetUserByUsername(ctx, db, flags.removeMod, nil)
if err != nil {
return false, err
}
if err = core.MakeUserModCLI(db, community, user.ID, false); err != nil {
return false, err
}
log.Printf("%s is no longer a moderator of %s\n", user.Username, community.Name)
}
return false, nil
}
if flags.populatePost != "" {
populatePost(db, flags.populatePost, flags.username, flags.numComments, false) // log.Fatals on failure
return true, nil
}
if flags.forcePassChange != "" {
if ok := cliConfirmCommand("Are you sure?"); !ok {
return false, errors.New("admin's not sure about the password change")
}
user, err := core.GetUserByUsername(ctx, db, flags.forcePassChange, nil)
if err != nil {
return false, err
}
if user.Deleted {
return false, fmt.Errorf("cannot change deleted user's password")
}
pass, err := core.HashPassword([]byte(flags.password))
if err != nil {
return false, err
}
if _, err = db.Exec("UPDATE users SET password = ? WHERE id = ?", pass, user.ID); err != nil {
return false, err
}
log.Println("Password changed successfully")
return false, nil
}
if flags.addAllUsersToCommunity != "" {
if err := core.AddAllUsersToCommunity(ctx, db, flags.addAllUsersToCommunity); err != nil {
return false, fmt.Errorf("failed to add all users to %s: %w", flags.addAllUsersToCommunity, err)
}
log.Printf("All users added to %s\n", flags.addAllUsersToCommunity)
return false, nil
}
if flags.printImagePath != "" {
id, err := uid.FromString(flags.printImagePath)
if err != nil {
return false, fmt.Errorf("%s is not a valid image id: %w", flags.printImagePath, err)
}
fmt.Printf("Image path: %s\n", images.ImagePath(id))
return false, nil
}
if flags.newBadge != "" {
if err := core.NewBadgeType(db, flags.newBadge); err != nil {
return false, fmt.Errorf("failed to create a new badge: %w", err)
}
return false, nil
}
return true, nil
}
// mysqlDSN returns a DSN that could be used to connect to a MySQL database. You
// may want to append mysql:// to the beginning of the returned string.
func mysqlDSN(addr, user, password, dbName string) string {
cfg := mysql.NewConfig()
cfg.Net = "tcp"
cfg.Addr = addr
cfg.User = user
cfg.Passwd = password
cfg.DBName = dbName
cfg.ParseTime = true
return cfg.FormatDSN()
}
// openDatabase returns a connection to mysql.
func openDatabase(addr, user, password, dbName string) *sql.DB {
if dbName == "" {
log.Fatal("No database selected")
}
db, err := sql.Open("mysql", mysqlDSN(addr, user, password, dbName))
if err != nil {
log.Fatal(err)
}
if err = db.Ping(); err != nil {
log.Fatal(err)
}
return db
}
// populatePost adds n comments to post with public ID id.
func populatePost(db *sql.DB, id, username string, n int, onlyTopLevel bool) {
ctx := context.Background()
post, err := core.GetPost(ctx, db, nil, id, nil, true)
if err != nil {
log.Fatal(err)
}
user, err := core.GetUserByUsername(ctx, db, username, nil)
if err != nil {
log.Fatal(err)
}
selectComment := func() *core.Comment {
var id uid.ID
row := db.QueryRow("select id from comments where deleted_at is null and post_id = ? order by RAND() limit 1", post.ID)
if err := row.Scan(&id); err != nil {
return nil
}
c, err := core.GetComment(ctx, db, id, nil)
if err != nil {
log.Fatal(err)
}
log.Println("Parent chosen")
return c
}
for i := 0; i < n; i++ {
var parent *uid.ID = new(uid.ID)
if !onlyTopLevel && i%2 == 0 {
c := selectComment()
if c != nil {
*parent = c.ID
}
}
text := utils.GenerateText()
nc, err := post.AddComment(ctx, user.ID, core.UserGroupNormal, parent, text)
if err != nil {
log.Fatal(err)
}
if _, err = db.Exec("update comments set points = ? where id = ?", rand.Int()%100, nc.ID); err != nil {
log.Fatal(err)
}
}
}
// cliConfirmcommand shows a [y/N] confirm prompt and returns true if the user
// enters y.
func cliConfirmCommand(message string) bool {
r := bufio.NewReader(os.Stdin)
fmt.Printf("%s [y/N]: ", message)
if s, err := r.ReadString('\n'); err != nil {
return false
} else if strings.ToLower(strings.TrimSpace(s)) != "y" {
return false
}
return true
}
// cliYesConfirmCommand shows type YES to continue prompt and returns true if the
// user types YES in capital letters.
func cliYesConfirmCommand() bool {
r := bufio.NewReader(os.Stdin)
fmt.Print("Type YES to continue: ")
if s, err := r.ReadString('\n'); err != nil {
return false
} else if strings.TrimSpace(s) != "YES" {
return false
}
return true
}
// hardReset deletes and recreates the database and Redis.
func hardReset(c *config.Config) error {
mysql, err := sql.Open("mysql", c.DBUser+":"+c.DBPassword+"@/?parseTime=true")
if err != nil {
return err
}
if ok := cliYesConfirmCommand(); !ok {
return errors.New("cannot continue without YES")
}
if _, err = mysql.Exec("drop database if exists " + c.DBName); err != nil {
return err
}
if _, err = mysql.Exec("create database " + c.DBName + " default character set utf8mb4"); err != nil {
return err
}
log.Println("Database (" + c.DBName + ") created")
if err = mysql.Close(); err != nil {
return err
}
if err = migrate(c, true, 0); err != nil {
return err
}
conn, err := redis.Dial("tcp", c.RedisAddress)
if err != nil {
return err
}
defer conn.Close()
if _, err = conn.Do("flushall"); err != nil {
return err
}
log.Println("Redis flushed")
log.Println("Reset complete")
return nil
}
var (
errMigrationsTableNotFound = errors.New("migrations table not found")
)
// migrationsVersion returns the last migration number (the value in the
// schema_migrations table). If the migrations table is not found, then
// errMigrationsTableNotFound is returned. If the migrations table is found but
// empty, then sql.ErrNoRows is returned.
func migrationsVersion(db *sql.DB) (int, error) {
if exists, err := mariadbTableExists(db, "schema_migrations"); err != nil {
return -1, err
} else if !exists {
return -1, errMigrationsTableNotFound
}
version := -1
if err := db.QueryRow("SELECT version FROM schema_migrations").Scan(&version); err != nil {
return -1, err
}
return version, nil
}
func mariadbTableExists(db *sql.DB, name string) (bool, error) {
var gotname string
if err := db.QueryRow(fmt.Sprintf("SHOW TABLES LIKE '%v'", name)).Scan(&gotname); err != nil {
if err == sql.ErrNoRows {
return false, nil
}
return false, err
}
if gotname == name {
return true, nil
}
return false, fmt.Errorf("gotname (%v) is not the same as name (%v)", gotname, name)
}
// createGhostUser creates the ghost user only if migrations have been run. If
// migrations have not yet been run, the function exists silently without
// returning an error
func createGhostUser(db *sql.DB) error {
if _, err := migrationsVersion(db); err != nil {
if err == errMigrationsTableNotFound || err == sql.ErrNoRows {
log.Println("Skipping creating ghost user, as migrations are not yet run.")
return nil
}
log.Printf("Error creating the ghost user: %v\n", err)
return err
}
created, err := core.CreateGhostUser(db)
if err != nil {
log.Printf("Error creating the ghost user: %v\n", err)
return err
}
if created {
log.Println("Ghost user succesfully created.")
}
return nil
}