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package main
import (
"bytes"
"context"
"database/sql"
"fmt"
"log"
"net/http"
"os"
"strconv"
"time"
"github.com/joho/godotenv"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer/html"
"paterissa.net/mblog/internal"
_ "github.com/jackc/pgx/v5/stdlib"
)
var db *sql.DB
var mdParser goldmark.Markdown
func writeErr(w http.ResponseWriter, errcode int, msg string) {
w.WriteHeader(errcode)
w.Write([]byte(msg))
return
}
func mdServe(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
writeErr(w, http.StatusMethodNotAllowed, "Method Not Allowed")
return
}
err := r.ParseMultipartForm(4 << 20)
if err != nil {
writeErr(w, http.StatusUnprocessableEntity, fmt.Sprintf("Failed to retrieve form data: %v", err))
return
}
var longBuf bytes.Buffer
var shortBuf bytes.Buffer
md := r.Form.Get("raw")
userId := r.Form.Get("user_id")
shouldCreateShort := len(md) > 255
err = mdParser.Convert([]byte(md), &longBuf)
if err != nil {
writeErr(w, http.StatusUnprocessableEntity, fmt.Sprintf("Failed to compile markdown into html: %v", err))
return
}
var shortMd string
if shouldCreateShort {
shortMd = md[0:249]
err = mdParser.Convert([]byte(shortMd), &shortBuf)
if err != nil {
writeErr(w, http.StatusUnprocessableEntity, fmt.Sprintf("Failed to compile markdown into html: %v", err))
return
}
}
ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
defer cancel()
tx, err := db.BeginTx(ctx, nil)
if err != nil {
writeErr(w, http.StatusInternalServerError, fmt.Sprintf("Failed to initialize transaction: %v", err))
return
}
defer tx.Rollback()
stmt, err := tx.PrepareContext(ctx, "INSERT INTO posts (user_id, brief, content) VALUES ($1, $2, $3);")
if err != nil {
writeErr(w, http.StatusInternalServerError, fmt.Sprintf("Failed to prepare DB statement: %v", err))
return
}
defer stmt.Close()
userIdInt, err := strconv.ParseUint(userId, 10, 64)
if err != nil {
writeErr(w, http.StatusUnprocessableEntity, fmt.Sprintf("Failed to parse userId: %v\n", err))
return
}
if shouldCreateShort {
_, err = stmt.ExecContext(ctx, userIdInt, shortBuf.Bytes(), longBuf.Bytes())
} else {
_, err = stmt.ExecContext(ctx, userIdInt, longBuf.Bytes(), longBuf.Bytes())
}
if err != nil {
writeErr(w, http.StatusInternalServerError, fmt.Sprintf("Failed to execute statement: %v", err))
return
}
err = tx.Commit()
if err != nil {
writeErr(w, http.StatusInternalServerError, fmt.Sprintf("Failed to commit DB transaction: %v", err))
return
}
}
func main() {
err := godotenv.Load()
if err != nil {
log.Fatal("Failed to load env")
}
mdParser = goldmark.New(
goldmark.WithExtensions(
extension.GFM,
extension.Footnote,
extension.Typographer,
),
goldmark.WithParserOptions(
parser.WithAutoHeadingID(),
),
goldmark.WithRendererOptions(
html.WithHardWraps(),
),
)
host := os.Getenv("db_host")
port, err := strconv.ParseUint(os.Getenv("db_port"), 10, 64)
if err != nil {
port = 5432
}
dbName := os.Getenv("db_name")
user := os.Getenv("db_user")
pass := os.Getenv("db_pass")
connStr := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", host, port, user, pass, dbName)
db, err = sql.Open("pgx", connStr)
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to connect to DB: %v\n", err)
os.Exit(1)
}
defer db.Close()
internal.Migrate(db, os.Getenv("webmaster"), os.Getenv("blog_pass1"), os.Getenv("blog_pass2"))
router := http.NewServeMux()
router.HandleFunc("/", mdServe)
appPort, err := strconv.ParseUint(os.Getenv("parser_port"), 10, 64)
if err != nil {
appPort = 5006
}
srv := &http.Server{
Addr: fmt.Sprintf(":%d", appPort),
Handler: router,
}
err = srv.ListenAndServe()
log.Fatal(err)
}
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