bbj2/server/cmd/main.go

219 lines
4.5 KiB
Go

package main
import (
"database/sql"
_ "embed"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"net/http"
"os"
"strings"
_ "github.com/mattn/go-sqlite3"
)
//go:embed schema.sql
var schemaSQL string
type Config struct {
Admins []string
Port int
Host string
InstanceName string `yaml:"instance_name"`
AllowAnon bool `yaml:"allow_anon"`
Debug bool
DBPath string `yaml:"db_path"`
}
type iostreams struct {
Err io.Writer
Out io.Writer
}
type Opts struct {
ConfigPath string
IO iostreams
Log func(string)
Logf func(string, ...interface{})
Config Config
DB *sql.DB
Reset bool
}
func main() {
var configFlag = flag.String("config", "config.yml", "A path to a config file.")
var resetFlag = flag.Bool("reset", false, "reset the database. WARNING this wipes everything.")
flag.Parse()
io := iostreams{
Err: os.Stderr,
Out: os.Stdout,
}
opts := &Opts{
ConfigPath: *configFlag,
Reset: *resetFlag,
IO: io,
// TODO use real logger
Log: func(s string) {
fmt.Fprintln(io.Out, s)
},
Logf: func(s string, args ...interface{}) {
fmt.Fprintf(io.Out, s, args...)
fmt.Fprintf(io.Out, "\n")
},
}
err := _main(opts)
if err != nil {
fmt.Fprintf(os.Stderr, "failed: %s", err)
}
}
type Teardown func()
func setupDB(opts *Opts) (Teardown, error) {
db, err := sql.Open("sqlite3", opts.Config.DBPath)
fmt.Printf("DBG %#v\n", db)
opts.DB = db
return func() { db.Close() }, err
}
func _main(opts *Opts) error {
cfg, err := parseConfig(opts.ConfigPath)
if err != nil {
fmt.Fprintf(os.Stderr, "could not read config file '%s'", opts.ConfigPath)
os.Exit(1)
}
opts.Config = *cfg
teardown, err := setupDB(opts)
if err != nil {
return fmt.Errorf("could not initialize DB: %w", err)
}
defer teardown()
err = ensureSchema(*opts)
if err != nil {
return err
}
setupAPI(*opts)
// TODO TLS or SSL or something
opts.Logf("starting server at %s:%d", cfg.Host, cfg.Port)
if err := http.ListenAndServe(fmt.Sprintf("%s:%d", cfg.Host, cfg.Port), nil); err != nil {
return fmt.Errorf("http server exited with error: %w", err)
}
return nil
}
func ensureSchema(opts Opts) error {
db := opts.DB
if opts.Reset {
err := os.Remove(opts.Config.DBPath)
if err != nil {
return fmt.Errorf("failed to delete database: %w", err)
}
}
rows, err := db.Query("select version from meta")
if err == nil {
//defer rows.Close()
rows.Next()
var version string
err = rows.Scan(&version)
if err != nil {
return fmt.Errorf("failed to check database schema version: %w", err)
} else if version == "" {
return errors.New("database is in unknown state")
}
return nil
}
if !strings.Contains(err.Error(), "no such table") {
return fmt.Errorf("got error checking database state: %w", err)
}
_, err = db.Exec(schemaSQL)
if err != nil {
return fmt.Errorf("failed to initialize database schema: %w", err)
}
return nil
}
func handler(opts Opts, f http.HandlerFunc) http.HandlerFunc {
// TODO make this more real
return func(w http.ResponseWriter, req *http.Request) {
opts.Log(req.URL.Path)
f(w, req)
}
}
// TODO I'm not entirely sold on this hash system; without transport
// encryption, it doesn't really help anything. I'd rather have plaintext +
// transport encryption and then, on the server side, proper salted hashing.
type User struct {
// TODO
ID string
}
type BBJResponse struct {
Error bool `json:"error"`
Data interface{} `json:"data"`
Usermap map[string]User `json:"usermap"`
}
func writeResponse(w http.ResponseWriter, resp BBJResponse) {
json.NewEncoder(w).Encode(resp)
}
func setupAPI(opts Opts) {
http.HandleFunc("/instance", handler(opts, func(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
writeResponse(w, BBJResponse{
Data: opts.Config.InstanceName,
})
}))
http.HandleFunc("/check_auth", handler(opts, func(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
http.Error(w, "bad method", 400)
return
}
type args struct {
TargetUser string `json:"target_user"`
TargetHash string `json:"target_hash"`
}
var a args
err := json.NewDecoder(req.Body).Decode(&a)
if err != nil {
http.Error(w, "could not parse arguments", 400)
}
opts.Logf("got %s %s", a.TargetUser, a.TargetHash)
// TODO
result := false
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
writeResponse(w, BBJResponse{
Data: result,
})
}))
}