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package main
import (
"bytes"
"fmt"
"regexp"
"log"
"io/ioutil"
"net/http"
"path/filepath"
"github.com/yuin/goldmark"
)
const (
VALID_ID_REGEX = `^[0-9]+$`
)
func indexGet(w http.ResponseWriter, r *http.Request, db *Database, templateRoot string) {
// 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 {
http.Error(w, "Failed to load recipes from database.", 500)
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 {
http.Error(w, "Could not parse recipe from database request.", 500)
return
} else {
elements = append(elements, element)
}
}
// render and return template
path := filepath.Join(templateRoot, "index.html")
ServeTemplate(w, "index", path, elements)
}
func recipeGet(w http.ResponseWriter, r *http.Request, db *Database, templateRoot string) {
// get id from URL parameters
ids := r.URL.Query()["id"]
if len(ids) != 1 {
msg := fmt.Sprintf("Exactly 1 'id' URL parameter expected but %d provided.", len(ids))
http.Error(w, msg, 400)
return
}
idStr := ids[0]
// validate id
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !(idRegex.MatchString(idStr)) {
http.Error(w, "Bad 'id' URL parameter.", 400)
return
}
// 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 {
http.Error(w, "Database returned error: " + err.Error(), 500)
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 {
http.Error(w, "Could not parse recipe from database request.", 500)
return
} else {
elements = append(elements, element)
}
}
// check result
if len(elements) != 1 {
http.Error(w, "Expected exactly 1 recipe from database.", 500)
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")
ServeTemplate(w, "recipe", path, elements[0])
}
func recipePost(w http.ResponseWriter, r *http.Request, db *Database) {
// get id from URL parameters
ids := r.URL.Query()["id"]
if len(ids) != 1 {
msg := fmt.Sprintf("Exactly 1 'id' URL parameter expected but %d provided.", len(ids))
http.Error(w, msg, 400)
return
}
idStr := ids[0]
// validate id
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !(idRegex.MatchString(idStr)) {
http.Error(w, "Bad 'id' URL parameter.", 400)
return
}
// read request body
buffer,_ := ioutil.ReadAll(r.Body) // FIXME error handling
body := string(buffer)
updateRecipe(db, body, idStr)
}
func recipeEditGet(w http.ResponseWriter, r *http.Request, db *Database, templateRoot string) {
// get id from URL parameters
ids := r.URL.Query()["id"]
if len(ids) != 1 {
http.Error(w, "Exactly 1 'id' URL parameter expected.", 400)
return
}
idStr := ids[0]
// validate id
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !(idRegex.MatchString(idStr)) {
http.Error(w, "Bad 'id' URL parameter.", 400)
return
}
// 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 {
http.Error(w, "Got error from database: " + err.Error(), 500)
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 {
http.Error(w, "Could not parse recipe from database request.", 500)
return
} else {
elements = append(elements, element)
}
}
// check result
if len(elements) != 1 {
http.Error(w, "Did not get exactly one recipe from database.", 500)
return
}
// render and return template
path := filepath.Join(templateRoot, "recipe_edit.html")
ServeTemplate(w, "recipe", path, elements[0])
}
func recipeEditPost(w http.ResponseWriter, r *http.Request, db *Database) {
// get id from URL parameters
ids := r.URL.Query()["id"]
if len(ids) != 1 {
http.Error(w, "Exactly 1 'id' URL parameter expected.", 400)
return
}
idStr := ids[0]
// validate id
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !(idRegex.MatchString(idStr)) {
http.Error(w, "Bad 'id' URL parameter.", 400)
return
}
// read request body
buffer,_ := ioutil.ReadAll(r.Body) // FIXME error handling
body := string(buffer)
updateRecipe(db, body, idStr)
}
func updateRecipe(db *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 recipeImageGet(w http.ResponseWriter, r *http.Request, storage string) {
// get ID
ids := r.URL.Query()["id"]
if len(ids) != 1 {
http.Error(w, "Expected exactly one 'id' URL parameter.", 400)
return
}
idStr := ids[0]
// validate ID
idRegex := regexp.MustCompile(VALID_ID_REGEX)
if !idRegex.MatchString(idStr) {
http.Error(w, "Bad 'id' URL parameter.", 400)
return
}
// serve image
path := fmt.Sprintf("recipes/image/%s.jpg", idStr)
ServeStorage(w, r, storage, path)
}
func addRecipesGet(w http.ResponseWriter, r *http.Request, static string) {
filename := "add.html"
path := filepath.Join(static, filename)
log.Printf("Trying to serve: %s", path)
http.ServeFile(w, r, path)
}
func addRecipesPost(w http.ResponseWriter, r *http.Request, db *Database) {
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 {
http.Error(w, "Could not add recipe.", 500)
return
}
id,err := res.LastInsertId()
if err != nil {
http.Error(w, "Expected exactly one recipe URL.", 400)
return
} else {
log.Println("Added custom recipe.")
redirect := fmt.Sprintf("/recipe?id=%d", id)
http.Redirect(w, r, redirect, 303)
return
}
}
func staticGet(w http.ResponseWriter, r *http.Request, filename string, staticRoot string) {
path := filepath.Join(staticRoot, filename)
log.Printf("Trying to serve: %s\n", path)
http.ServeFile(w, r, path)
}
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