/
main.go
249 lines (208 loc) · 4.81 KB
/
main.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"log"
"log/slog"
"net/http"
"os"
"strconv"
"strings"
"feodor.dk/linkyd/backend"
"feodor.dk/linkyd/linky"
"feodor.dk/linkyd/linky/link"
"feodor.dk/linkyd/static"
_ "github.com/mattn/go-sqlite3"
)
var ErrInvalidPath = errors.New("invalid path")
var (
help bool
verbose bool
port int = 8080
loadFile string
)
type ParserState int
const (
ParserStateFirst ParserState = iota
ParserStateInvalid
ParserStateFlag
ParserStatePort
ParserStateLoadFile
)
func parseCliArgs() error {
var parserState ParserState = ParserStateFirst
for _, arg := range os.Args {
switch parserState {
case ParserStateFirst:
parserState = ParserStateFlag
continue
case ParserStateFlag:
if s, err := parseFlag(arg); err != nil {
return err
} else {
parserState = s
}
case ParserStatePort:
if err := parsePort(arg); err != nil {
return err
}
case ParserStateLoadFile:
if err := validateLoadFile(arg); err != nil {
return err
}
default:
return errors.New("invalid parser state")
}
}
return nil
}
func parseFlag(arg string) (ParserState, error) {
switch arg {
case "-p", "--port":
return ParserStatePort, nil
case "-l", "--load":
return ParserStateLoadFile, nil
case "-h", "--help":
help = true
return ParserStateFlag, nil
case "-v", "--verbose":
verbose = true
return ParserStateFlag, nil
default:
return ParserStateInvalid, errors.New("invalid flag")
}
}
func parsePort(arg string) error {
if i, err := strconv.ParseInt(arg, 10, 32); err != nil {
return err
} else {
port = int(i)
return nil
}
}
func validateLoadFile(arg string) error {
if finfo, err := os.Stat(arg); err != nil {
return err
} else if finfo.IsDir() {
return errors.New("load file is a directory")
}
loadFile = arg
return nil
}
func main() {
if help {
printHelp()
os.Exit(0)
}
configureSlog()
repo, err := link.NewSQLiteLinkRepository()
if err != nil {
slog.Error("could not create sqlite3 repository")
os.Exit(1)
}
linky := linky.New(repo)
if err := parseCliArgs(); err != nil {
printHelp()
os.Exit(1)
}
if loadFile != "" {
if err := loadLinks(repo); err != nil {
println("Error occured loading links from file:", err.Error())
os.Exit(1)
} else {
println("Loaded links from", loadFile)
}
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
b := backend.Get(&linky, w, r)
b.List()
})
http.HandleFunc("/as/", func(w http.ResponseWriter, r *http.Request) {
b := backend.Get(&linky, w, r)
if asUser, err := getPathSegment(r, 2); err != nil {
w.WriteHeader(http.StatusBadRequest)
} else {
b.As(asUser)
}
})
http.HandleFunc("/links", func(w http.ResponseWriter, r *http.Request) {
b := backend.Get(&linky, w, r)
switch r.Method {
case "POST":
b.Create()
case "GET":
b.List()
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
})
http.HandleFunc("/links/", func(w http.ResponseWriter, r *http.Request) {
b := backend.Get(&linky, w, r)
if r.Method != "DELETE" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
id, err := getPathSegment(r, 2)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
b.Delete(id)
})
http.HandleFunc("/favicon.ico", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
w.Header().Add("Content-Type", "image/x-icon")
w.Header().Add("Content-Length", fmt.Sprintf("%d", len(static.Favicon)))
w.Write(static.Favicon)
})
listenAddr := fmt.Sprintf(":%d", port)
slog.Info("Starting HTTP listener", slog.String("address", listenAddr))
log.Fatal(http.ListenAndServe(listenAddr, nil))
}
func getPathSegment(r *http.Request, argumentIndex int) (string, error) {
parts := strings.Split(r.URL.Path, "/")
if len(parts) != argumentIndex+1 {
return "", ErrInvalidPath
}
return parts[argumentIndex], nil
}
type LinkDump = map[string]link.Link
func loadLinks(repo link.Repository) error {
var dump LinkDump
if data, err := os.ReadFile(loadFile); err != nil {
return err
} else if err := json.Unmarshal(data, &dump); err != nil {
return err
}
for _, value := range dump {
repo.Create(value)
}
return nil
}
func printHelp() {
printlns(
"Usage: linkyd [OPTION]...",
"Run the linky daemon web server.",
"",
" -h, --help display this message and exit",
" -l, --load <DUMP FILE> load a dump of links upon start-up",
" -p, --port <PORT> specify the port, defaults to 8080",
)
}
func printlns(lines ...string) {
for _, line := range lines {
println(line)
}
}
func configureSlog() {
logLevel := slog.LevelInfo
if verbose {
logLevel = slog.LevelDebug
}
handler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel})
slog.SetDefault(slog.New(handler))
}