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package main
import "fmt"
import "io"
import "io/ioutil"
import "net/http"
import "os"
import "strconv"
import _ "github.com/lib/pq"
import "database/sql"
import "encoding/json"
type APIStatus struct {
Code int
Msg string
}
type APIResponse struct {
Status APIStatus
Data interface{}
}
func MakeAPIResponse(status int, msg string, data interface{}) *APIResponse {
return &APIResponse{
Status: APIStatus{
Code: status,
Msg: msg,
},
Data: data,
}
}
func sendResponse(w http.ResponseWriter, code int, msg string, data interface{}) {
w.Header().Set("Access-Control-Allow-Origin", "*") //Enable CORS
w.Header().Set("Content-Type",
"application/json; charset=UTF-8")
w.WriteHeader(code)
resp := MakeAPIResponse(code, msg, data)
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
}
func RecipeList(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
var ids []int
var id int
rows, err := db.Query("SELECT id FROM recipes")
if err != nil {
fmt.Println(err)
} else {
for rows.Next() {
rows.Scan(&id)
ids = append(ids, id)
}
}
sendResponse(w, http.StatusOK, "Successful Request", ids)
} else if r.Method == "POST" {
var recipe *Recipe
body, err := ioutil.ReadAll(io.LimitReader(r.Body, 1048576))
if err != nil {
panic(err)
}
err = r.Body.Close()
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &recipe)
if err != nil {
fmt.Println(err)
sendResponse(w, http.StatusUnprocessableEntity,
"Invalid Recipe", nil)
return
}
err = AddRecipeDB(recipe, db)
if err != nil {
fmt.Println(err)
sendResponse(w, http.StatusBadRequest,
"Recipe could not be added", recipe)
return
}
sendResponse(w, http.StatusCreated, "Recipe added successfully",
recipe)
} else if r.Method == "OPTIONS" {
w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS") //Enable CORS
w.Header().Set("Access-Control-Allow-Headers", "Content-Type") //Enable CORS
sendResponse(w, http.StatusOK, "Set Allowed Methods CORS", nil)
} else {
sendResponse(w, http.StatusMethodNotAllowed, "Invalid method",
nil)
}
}
func SingleRecipe(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*") //Enable CORS
recipe_id, err := strconv.Atoi(r.URL.Path[len("/recipes/"):])
if err != nil {
fmt.Println("Not a valid ID")
return
}
if r.Method == "GET" {
recipe := RecipeFromId(recipe_id, db)
if recipe == nil {
sendResponse(w, http.StatusNotFound, "Recipe not Found",
nil)
} else {
sendResponse(w, http.StatusOK, "Successful", recipe)
}
} else if r.Method == "POST" {
var status int
row := db.QueryRow(`SELECT id FROM recipes WHERE id = $1`,
recipe_id)
err := row.Scan(&recipe_id)
if err == sql.ErrNoRows {
status = http.StatusNotFound
} else {
status = http.StatusConflict
}
sendResponse(w, status, "Cannot add to specific resource",
nil)
} else if r.Method == "PUT" {
var recipe *Recipe
body, err := ioutil.ReadAll(io.LimitReader(r.Body, 1048576))
if err != nil {
panic(err)
}
err = r.Body.Close()
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &recipe)
if err != nil {
fmt.Println(err)
sendResponse(w, http.StatusUnprocessableEntity,
"Invalid Recipe", nil)
return
}
recipe.Id = recipe_id
err = UpdateRecipeDB(recipe, db)
if err != nil {
fmt.Println(err)
sendResponse(w, http.StatusBadRequest,
"Recipe could not be updated", recipe)
return
}
sendResponse(w, http.StatusCreated, "Recipe added successfully",
recipe)
} else if r.Method == "DELETE" {
res, err := db.Exec(`DELETE FROM recipes where id = $1`,
recipe_id)
if err != nil {
panic(err)
}
if ra, _ := res.RowsAffected(); ra == 0 {
sendResponse(w, http.StatusNotFound, "Recipe Not found",
nil)
} else {
sendResponse(w, http.StatusOK,
"Recipe Deleted Successfully", nil)
}
} else if r.Method == "OPTIONS" {
w.Header().Set("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE, OPTIONS") //Enable CORS
w.Header().Set("Access-Control-Allow-Headers", "Content-Type") //Enable CORS
sendResponse(w, http.StatusOK, "Set Allowed Methods CORS", nil)
} else {
sendResponse(w, http.StatusMethodNotAllowed, "Invalid method",
nil)
}
}
var DB_PASSWORD string
var DB_USER string
var db *sql.DB
const DB_NAME = "recipe_buddy"
func init() {
DB_PASSWORD = os.Getenv("DATABASE_PASSWORD")
DB_USER = os.Getenv("DATABASE_USER")
}
func main() {
var err error
dbinfo := fmt.Sprintf("user=%s password=%s dbname=%s sslmode=disable",
DB_USER, DB_PASSWORD, DB_NAME)
db, err = sql.Open("postgres", dbinfo)
if err != nil {
panic(err)
}
err = db.Ping()
if err != nil {
panic(err)
}
http.HandleFunc("/recipes", RecipeList)
http.HandleFunc("/recipes/", SingleRecipe)
http.ListenAndServe(":8888", nil)
}
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