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assets.go
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assets.go
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package assets
import (
"github.com/gorilla/mux"
"github.com/gorilla/schema"
"github.com/retro486/go-asset-repo/auth"
"net/http"
"mime"
"io/ioutil"
"mime/multipart"
"html/template"
"fmt"
"os"
"strings"
"log"
"database/sql"
"strconv"
"net/url"
_ "github.com/mattn/go-sqlite3"
)
type Asset struct {
Id *int64 `schema:"-"`
URL string `schema:"url"`
Name string `schema:"name"`
FileName string `schema:"filename"`
IsImage bool `schema:"isimage"` // for determining if a thumbnail preview should be shown
}
var formDecoder = schema.NewDecoder()
var templatePath = os.Getenv("ASSET_REPO_TEMPLATES")
func GetDBConnection() *sql.DB {
dbCreateSQL := "create table assets (id integer not null primary key autoincrement, name text, url text, filename text, isimage boolean);"
db, err := sql.Open("sqlite3", "assets.db")
if err != nil {
return nil
}
_, err = db.Exec(dbCreateSQL)
if err == nil {
log.Printf("Created database")
}
return db
}
func LoadStoredAssets() []Asset {
// Loads ALL assets. TODO - allow pagination to save on memory when this list gets very large
dbConn := GetDBConnection()
defer dbConn.Close()
assets := []Asset{}
rows, err := dbConn.Query("select id, name, url, isimage from assets")
if err != nil {
return nil
}
defer rows.Close()
for rows.Next() {
var id int64
var name string
var url string
var isImage bool
rows.Scan(&id, &name, &url, &isImage)
assets = append(assets, Asset{Id: &id, URL: url, Name: name, IsImage: isImage})
}
rows.Close()
return assets
}
func FindAsset(id int64) Asset {
dbConn := GetDBConnection()
defer dbConn.Close()
stmt, err := dbConn.Prepare("select id, name, url, filename, isimage from assets where id = ?")
if err != nil {
return Asset{}
}
defer stmt.Close()
var name string
var url string
var fileName string
var isImage bool
err = stmt.QueryRow(id).Scan(&id, &name, &url, &fileName, &isImage)
if err != nil {
return Asset{}
}
return Asset{Id: &id, URL: url, Name: name, FileName: fileName, IsImage: isImage}
}
func CreateAsset(asset *Asset) error {
dbConn := GetDBConnection()
defer dbConn.Close()
tx, err := dbConn.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare("insert into assets(name, url, filename, isimage) values (?, ?, ?, ?)")
if err != nil {
return err
}
defer stmt.Close()
result, err := stmt.Exec(asset.Name, asset.URL, asset.FileName, asset.IsImage)
if err != nil {
return err
}
tx.Commit()
id, _ := result.LastInsertId()
asset.Id = &id
return nil
}
func DestroyAsset(id int64) error {
asset := FindAsset(id)
dbConn := GetDBConnection()
defer dbConn.Close()
tx, err := dbConn.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare("delete from assets where id = ?")
if err != nil {
return err
}
defer stmt.Close()
_, err = stmt.Exec(id)
if err != nil {
return err
} else {
err = os.Remove(asset.FileName)
if err != nil {
fmt.Printf("%q:%q\n", err, asset)
}
}
tx.Commit()
return nil
}
func UpdateAsset(asset *Asset) error {
dbConn := GetDBConnection()
defer dbConn.Close()
tx, err := dbConn.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare("update assets set name = ?, isimage = ? where id = ?")
if err != nil {
return err
}
defer stmt.Close()
_, err = stmt.Exec(asset.Name, asset.IsImage, &asset.Id)
if err != nil {
return err
}
tx.Commit()
return nil
}
func ControllerShowIndex(w http.ResponseWriter, r *http.Request) {
auth.CheckAuthCookie(w, r)
assets := LoadStoredAssets()
tmpl, err := template.ParseFiles(templatePath + "/assets/index.html")
if err != nil {
log.Fatal("Template missing: " + templatePath + "/assets/index.html")
}
err = tmpl.Execute(w, map[string]interface{} { "Assets": assets })
if err != nil {
log.Fatal("Unable to write index template to response.\n")
}
}
func ControllerNewAsset(w http.ResponseWriter, r *http.Request) {
auth.CheckAuthCookie(w, r)
tmpl, err := template.ParseFiles(templatePath + "/assets/new.html")
if err != nil {
log.Fatal("Template missing: " + templatePath + "/assets/new.html")
}
err = tmpl.Execute(w, nil)
if err != nil {
log.Fatal("Unable to write new template to response.\n")
}
}
func ControllerCreateAsset(w http.ResponseWriter, r *http.Request) {
auth.CheckAuthCookie(w, r)
if r.Method == "POST" {
err := r.ParseForm()
if err != nil {
// ERROR: Unable to read form data.
log.Print("ERROR: Bad form data\n")
http.Redirect(w, r, "/", 302)
} else {
// err := formDecoder.Decode(asset, r.PostForm)
// if err == nil {
_, params, err := mime.ParseMediaType(r.Header.Get("Content-Type"))
if err == nil {
mr := multipart.NewReader(r.Body, params["boundary"])
form, err := mr.ReadForm(1024)
if err == nil {
asset := new(Asset)
asset.Name = strings.Join(form.Value["name"], "")
if strings.Join(form.Value["isimage"],"") == "on" {
asset.IsImage = true
} else {
asset.IsImage = false
}
if err == nil {
if len(form.File["file"]) == 1 {
fileName := form.File["file"][0].Filename
destFileName := os.Getenv("ASSET_REPO_UPLOAD_DIR") + "/" + url.QueryEscape(fileName)
asset.FileName = destFileName
asset.URL = os.Getenv("ASSET_REPO_BASE_URL") + "/" + fileName
// os.Copy(form.File["file"][0].tmpfile, destFileName)
tmpFile, err := form.File["file"][0].Open()
if err == nil {
if err == nil {
data, err := ioutil.ReadAll(tmpFile)
if err == nil {
err = ioutil.WriteFile(destFileName, data, 0660)
if err == nil {
err = CreateAsset(asset)
}
tmpFile.Close()
}
}
}
}
form.RemoveAll()
}
}
} else {
log.Print("ERROR: Bad form data\n")
}
}
}
http.Redirect(w, r, "/assets", 302)
}
func ControllerEditAsset(w http.ResponseWriter, r *http.Request) {
auth.CheckAuthCookie(w, r)
vars := mux.Vars(r)
id, _ := strconv.ParseInt(vars["id"], 10, 32)
asset := FindAsset(id)
if asset.Id == nil {
// ERROR asset not found or DB error
http.Redirect(w, r, "/assets", 302)
}
tmpl, err := template.ParseFiles(templatePath + "/assets/edit.html")
if err != nil {
log.Fatal("Template missing: " + templatePath + "/assets/edit.html")
}
err = tmpl.Execute(w, asset)
if err != nil {
log.Fatal("Unable to write edit template to response.\n")
}
}
func ControllerDestroyAsset(w http.ResponseWriter, r *http.Request) {
auth.CheckAuthCookie(w, r)
vars := mux.Vars(r)
id, _ := strconv.ParseInt(vars["id"], 10, 32)
_ = DestroyAsset(id)
http.Redirect(w, r, "/assets", 302)
}
func ControllerUpdateAsset(w http.ResponseWriter, r *http.Request) {
auth.CheckAuthCookie(w, r)
vars := mux.Vars(r)
id, _ := strconv.ParseInt(vars["id"], 10, 32)
if r.Method == "POST" {
err := r.ParseForm()
if err != nil {
// ERROR: Unable to read form data.
log.Print("ERROR: Bad form data\n")
http.Redirect(w, r, "/", 302)
} else {
asset := new(Asset)
err := formDecoder.Decode(asset, r.PostForm)
if err == nil {
asset.Id = &id
_ = UpdateAsset(asset)
} else {
fmt.Printf("%s\n", r.PostForm)
fmt.Printf("%s\n", err)
}
http.Redirect(w, r, "/assets", 302)
}
} else {
http.Redirect(w, r, "/assets", 302)
}
}