bbj2/server/cmd/main.go

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package main
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import (
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"database/sql"
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_ "embed"
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"encoding/json"
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"errors"
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"flag"
"fmt"
"io"
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"net/http"
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"os"
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"strings"
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_ "github.com/mattn/go-sqlite3"
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)
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//go:embed schema.sql
var schemaSQL string
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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"`
}
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type iostreams struct {
Err io.Writer
Out io.Writer
}
type Opts struct {
ConfigPath string
IO iostreams
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Log func(string)
Logf func(string, ...interface{})
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Config Config
DB *sql.DB
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Reset bool
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}
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func main() {
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var configFlag = flag.String("config", "config.yml", "A path to a config file.")
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var resetFlag = flag.Bool("reset", false, "reset the database. WARNING this wipes everything.")
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flag.Parse()
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io := iostreams{
Err: os.Stderr,
Out: os.Stdout,
}
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opts := &Opts{
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ConfigPath: *configFlag,
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Reset: *resetFlag,
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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...)
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fmt.Fprintf(io.Out, "\n")
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},
}
err := _main(opts)
if err != nil {
fmt.Fprintf(os.Stderr, "failed: %s", err)
}
}
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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 {
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cfg, err := parseConfig(opts.ConfigPath)
if err != nil {
fmt.Fprintf(os.Stderr, "could not read config file '%s'", opts.ConfigPath)
os.Exit(1)
}
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opts.Config = *cfg
teardown, err := setupDB(opts)
if err != nil {
return fmt.Errorf("could not initialize DB: %w", err)
}
defer teardown()
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err = ensureSchema(*opts)
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if err != nil {
return err
}
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setupAPI(*opts)
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// TODO TLS or SSL or something
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opts.Logf("starting server at %s:%d", cfg.Host, cfg.Port)
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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)
}
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return nil
}
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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 {
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defer rows.Close()
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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)
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if err != nil {
return fmt.Errorf("failed to initialize database schema: %w", err)
}
return nil
}
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func handler(opts Opts, f http.HandlerFunc) http.HandlerFunc {
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// TODO make this more real
return func(w http.ResponseWriter, req *http.Request) {
opts.Log(req.URL.Path)
f(w, req)
}
}
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// 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) {
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w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(resp)
}
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func writeErrorResponse(w http.ResponseWriter, code int, resp BBJResponse) {
w.WriteHeader(code)
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(resp)
}
// NB breaking: i'm not just returning 200 always but using http status codes
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func setupAPI(opts Opts) {
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http.HandleFunc("/instance", handler(opts, func(w http.ResponseWriter, req *http.Request) {
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writeResponse(w, BBJResponse{
Data: opts.Config.InstanceName,
})
}))
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serverErr := func(w http.ResponseWriter) {
writeErrorResponse(w, 500, BBJResponse{
Error: true,
Data: "server error",
})
}
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badMethod := func(w http.ResponseWriter) {
writeErrorResponse(w, 400, BBJResponse{
Error: true,
Data: "bad method",
})
}
invalidArgs := func(w http.ResponseWriter) {
writeErrorResponse(w, 400, BBJResponse{
Error: true,
Data: "invalid args",
})
}
http.HandleFunc("/user_register", handler(opts, func(w http.ResponseWriter, req *http.Request) {
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if req.Method != "POST" {
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badMethod(w)
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return
}
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type AuthArgs struct {
Username string `json:"user_name"`
AuthHash string `json:"auth_hash"`
}
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var args AuthArgs
if err := json.NewDecoder(req.Body).Decode(&args); err != nil {
invalidArgs(w)
return
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}
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db := opts.DB
stmt, err := db.Prepare("select auth_hash from users where user_name = ?")
if err != nil {
opts.Logf("user_register error: %s", err.Error())
serverErr(w)
return
}
defer stmt.Close()
opts.Logf("querying for %s", args.Username)
var authHash string
err = stmt.QueryRow(args.Username).Scan(&authHash)
if err == nil {
opts.Logf("found %s", args.Username)
// code 4 apparently
writeErrorResponse(w, 403, BBJResponse{
Error: true,
Data: "user already exists",
})
return
} else if err != nil && !strings.Contains(err.Error(), "no rows in result") {
opts.Logf("user_register error: %s", err.Error())
serverErr(w)
return
}
// TODO register
writeResponse(w, BBJResponse{
Data: true, // TODO probably something else
// TODO prob usermap
})
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}))
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http.HandleFunc("/check_auth", handler(opts, func(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
badMethod(w)
return
}
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type AuthArgs struct {
Username string `json:"target_user"`
AuthHash string `json:"target_hash"`
}
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var args AuthArgs
if err := json.NewDecoder(req.Body).Decode(&args); err != nil {
invalidArgs(w)
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return
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}
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opts.Logf("got %s %s", args.Username, args.AuthHash)
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db := opts.DB
stmt, err := db.Prepare("select auth_hash from users where user_name = ?")
if err != nil {
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opts.Logf("check_auth error: %s", err.Error())
serverErr(w)
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return
}
defer stmt.Close()
var authHash string
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err = stmt.QueryRow(args.Username).Scan(&authHash)
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if err != nil {
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if strings.Contains(err.Error(), "no rows in result") {
opts.Logf("user not found")
writeErrorResponse(w, 404, BBJResponse{
Error: true,
Data: "user not found",
})
} else {
opts.Logf("check_auth error: %s", err.Error())
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serverErr(w)
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}
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return
}
// TODO unique constraint on user_name
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if authHash != args.AuthHash {
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http.Error(w, "incorrect password", 403)
writeErrorResponse(w, 403, BBJResponse{
Error: true,
Data: "incorrect password",
})
return
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}
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// TODO include usermap?
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writeResponse(w, BBJResponse{
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Data: true,
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})
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}))
}