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util.go
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util.go
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package main
import (
"database/sql"
"encoding/hex"
"encoding/json"
"fmt"
"math"
"net/http"
"path/filepath"
"strconv"
"strings"
"github.com/nektro/go-util/util"
dbstorage "github.com/nektro/go.dbstorage"
etc "github.com/nektro/go.etc"
"github.com/nektro/go.etc/htp"
"github.com/zeebo/blake3"
. "github.com/nektro/go-util/alias"
)
func pageInit(c *htp.Controller, r *http.Request, w http.ResponseWriter, method string, requireLogin bool, requireMember bool, requireAdmin bool, htmlOut bool) (*User, error) {
if r.Method != method {
writeResponse(r, w, htmlOut, "Forbidden Method", F("%s is not allowed on this endpoint.", r.Method), "", "")
return nil, E("bad http method")
}
if method == http.MethodPost {
r.ParseMultipartForm(int64(config.MaxFileSize * Megabyte))
}
if method == http.MethodPut {
r.ParseForm()
}
if !requireLogin {
return nil, nil
}
s := etc.JWTGetClaims(c, r)
sp := strings.SplitN(s["sub"].(string), "\n", 2)
u := queryUserBySnowflake(sp[0], sp[1])
if requireMember && !u.IsMember {
writeResponse(r, w, htmlOut, "Access Forbidden", "You must be a member to view this page.", "", "")
return u, E("not a member")
}
if requireAdmin && !u.IsAdmin {
writeResponse(r, w, htmlOut, "Access Forbidden", "You must be an admin to view this page.", "", "")
return u, E("not an admin")
}
return u, nil
}
func writeResponse(r *http.Request, w http.ResponseWriter, htmlOut bool, title string, message string, url string, link string) {
data := map[string]interface{}{
"base": "/",
"title": title,
"message": message,
"url": url,
"link": link,
}
if htmlOut {
etc.WriteHandlebarsFile(r, w, "/response.hbs", data)
} else {
writeJson(w, data)
}
}
func queryUserBySnowflake(provider, snowflake string) *User {
rows := db.Build().Se("*").Fr("users").Wh("snowflake", snowflake).Exe()
if rows.Next() {
ru := scanUser(rows)
rows.Close()
return &ru
}
// else
dbstorage.InsertsLock.Lock()
id := db.QueryNextID("users")
adm := id == 1
db.Build().Ins("users", id, snowflake, T(), adm, adm, "", provider).Exe()
dbstorage.InsertsLock.Unlock()
return queryUserBySnowflake(provider, snowflake)
}
func scanUser(rows *sql.Rows) User {
var u User
rows.Scan(&u.ID, &u.Snowflake, &u.JoinedOn, &u.IsMember, &u.IsAdmin, &u.Username, &u.Provider)
return u
}
func saveOAuth2Info(w http.ResponseWriter, r *http.Request, provider string, id string, name string, resp map[string]interface{}) {
etc.JWTSet(w, provider+"\n"+id)
if dbstorage.QueryHasRows(db.Build().Se("*").Fr("users").WR("provider", "IS", "NULL", true).Wh("snowflake", id).Exe()) {
util.Log("update:", "user:", "provider:", provider)
db.Build().Up("users", "provider", provider).WR("provider", "IS", "NULL", true).Wh("snowflake", id).Exe()
}
queryUserBySnowflake(provider, id)
db.Build().Up("users", "username", name).Wh("snowflake", id).Exe()
}
func writePage(r *http.Request, w http.ResponseWriter, user *User, hbs string, page string, title string, data map[string]interface{}) {
ctx := map[string]interface{}{
"version": Version,
"base": "/",
"user": user,
"page": page,
"title": title,
}
etc.WriteHandlebarsFile(r, w, "/_header.hbs", ctx)
ctx["data"] = data
etc.WriteHandlebarsFile(r, w, F("/%s.hbs", hbs), ctx)
}
func writeJson(w http.ResponseWriter, val interface{}) {
res, _ := json.Marshal(val)
w.Header().Add("content-type", "application/json")
fmt.Fprintln(w, string(res))
}
func splitByWidthMake(str string, size int, n int) []string {
strLength := len(str)
splitedLength := int(math.Ceil(float64(strLength) / float64(size)))
splited := []string{}
var start, stop, count int
for i := 0; i < splitedLength; i++ {
if n > 0 && count == n {
splited = append(splited, str[start:])
break
}
start = i * size
stop = start + size
if stop > strLength {
stop = strLength
}
splited = append(splited, str[start:stop])
count++
}
return splited
}
func queryImagesByUser(user *User) []string {
var res []string
rows := db.Build().Se("*").Fr("images").Wh("uploader", strconv.Itoa(user.ID)).Exe()
for rows.Next() {
img := scanImage(rows)
ext := strings.ToLower(filepath.Ext(img.Name))
res = append(res, img.Hash+ext)
}
rows.Close()
return res
}
func scanImage(rows *sql.Rows) ImageRow {
var i ImageRow
rows.Scan(&i.ID, &i.Hash, &i.Uploader, &i.Name, &i.AddedOn)
return i
}
func reverse(a []string) {
for i := len(a)/2 - 1; i >= 0; i-- {
opp := len(a) - 1 - i
a[i], a[opp] = a[opp], a[i]
}
}
func queryAllUsers() []User {
var res []User
rows := db.Build().Se("*").Fr("users").Exe()
for rows.Next() {
res = append(res, scanUser(rows))
}
rows.Close()
return res
}
func isInt(x string) bool {
_, err := strconv.ParseInt(x, 10, 32)
return err == nil
}
func hashBytes(ba []byte) string {
if config.ImgAlgo == "zeebo/blake3" {
h := blake3.New()
h.Write(ba)
return hex.EncodeToString(h.Sum([]byte{}))
}
return util.Hash(config.ImgAlgo, ba)
}