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package web
import (
"bytes"
"fmt"
"regexp"
"log"
"io/ioutil"
"net/http"
"path/filepath"
"xengineering.eu/ceres/utils"
"github.com/yuin/goldmark"
)
const (
VALID_ID_REGEX = `^[0-9]+$`
)
func static(filename string, staticRoot string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
path := filepath.Join(staticRoot, filename)
log.Printf("Trying to serve: %s\n", path)
http.ServeFile(w, r, path)
}
}
func index(db *utils.Database, templateRoot string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// get data from database
cmd := "SELECT id,title FROM recipes ORDER BY title;"
log.Printf("Query: %s", cmd)
rows, err := db.Backend.Query(cmd)
if err != nil {
utils.Err(w, 1)
return
}
defer rows.Close()
// prepare data store
type Element struct {
Id string
Title string
}
elements := make([]Element, 0)
// scan database rows to data store
for rows.Next() {
var element Element
err := rows.Scan(&element.Id, &element.Title)
if err != nil {
utils.Err(w, 2)
return
} else {
elements = append(elements, element)
}
}
// render and return template
path := filepath.Join(templateRoot, "index.html")
utils.ServeTemplate(w, "index", path, elements)
}
}
func recipe(db *utils.Database, templateRoot string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// get id from URL parameters
ids := r.URL.Query()["id"]
if len(ids) != 1 {
utils.Err(w, 3, len(ids))
return
}
idStr := ids[0]
// validate id
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !(idRegex.MatchString(idStr)) {
utils.Err(w, 4, idStr, VALID_ID_REGEX)
return
}
if r.Method == "GET" {
// get data from database
cmd := fmt.Sprintf("SELECT title,upstream_url,description_markdown FROM recipes WHERE (id='%s');", idStr)
log.Printf("Query: %s", cmd)
rows, err := db.Backend.Query(cmd)
if err != nil {
utils.Err(w, 5, err)
return
}
defer rows.Close()
// prepare data store
type Element struct {
Id string
Title string
UpstreamUrl string
DescriptionMarkdown string
RenderedDescriptionMarkdown string
}
elements := make([]Element, 0)
// scan database rows to data store
for rows.Next() {
var element Element
element.Id = idStr
err := rows.Scan(&element.Title, &element.UpstreamUrl, &element.DescriptionMarkdown)
if err != nil {
utils.Err(w, 2)
return
} else {
elements = append(elements, element)
}
}
// check result
if len(elements) != 1 {
utils.Err(w, 6, len(elements))
return
}
// render markdown
var buf bytes.Buffer
goldmark.Convert([]byte(elements[0].DescriptionMarkdown), &buf)
elements[0].RenderedDescriptionMarkdown = buf.String()
// render and return template
path := filepath.Join(templateRoot, "recipe.html")
utils.ServeTemplate(w, "recipe", path, elements[0])
}
if r.Method == "POST" {
// read request body
buffer,_ := ioutil.ReadAll(r.Body) // FIXME error handling
body := string(buffer)
updateRecipe(db, body, idStr)
}
}
}
func updateRecipe(db *utils.Database, body string, idStr string) {
// execute SQL UPDATE
_,_ = db.Backend.Exec(`
UPDATE
recipes
SET
description_markdown=?
WHERE
(id=?);
`,
body, idStr,
) // FIXME error handling
return
}
func image(storageRoot string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// get ID
ids := r.URL.Query()["id"]
if len(ids) != 1 {
utils.Err(w, 3, len(ids))
return
}
idStr := ids[0]
// validate ID
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !idRegex.MatchString(idStr) {
utils.Err(w, 4, idStr, VALID_ID_REGEX)
return
}
// serve image
path := fmt.Sprintf("recipes/image/%s.jpg", idStr)
utils.ServeStorage(w, r, storageRoot, path)
}
}
func add_recipes(db *utils.Database, storageRoot string, staticRoot string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
filename := "add.html"
path := filepath.Join(staticRoot, filename)
log.Printf("Trying to serve: %s", path)
http.ServeFile(w, r, path)
return
}
if r.Method == "POST" {
url := r.FormValue("url")
title := r.FormValue("title")
cmd := fmt.Sprintf("INSERT INTO recipes (title,upstream_url) VALUES ('%s', '%s')", title, url)
log.Println(cmd)
res,err := db.Backend.Exec(cmd)
if err != nil {
utils.Err(w, 9, err)
return
}
id,err := res.LastInsertId()
if err != nil {
utils.Err(w, 11, err)
return
} else {
log.Println("Added custom recipe.")
redirect := fmt.Sprintf("/recipe?id=%d", id)
http.Redirect(w, r, redirect, 303)
return
}
}
}
}
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