Created
October 12, 2022 05:17
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package main | |
import ( | |
"encoding/json" | |
"fmt" | |
"log" | |
"net/http" | |
"regexp" | |
) | |
type User struct { | |
Id string `json:"Id"` | |
FirstName string `json:"first_name"` | |
LastName string `json:"last_name"` | |
DOB string `json:"date_of_birth"` | |
Email string `json:"email"` | |
PhoneNumber string `json:"phone_number"` | |
} | |
type Response struct { | |
Status int `json:"status"` | |
Response any `json:"response"` | |
} | |
// Index let's declare a global Index array | |
// that we can then populate in our main function | |
// to simulate a database | |
var Index = make(map[string]User) | |
var ( | |
getUserRe = regexp.MustCompile(`^\/users\/(\d+)$`) | |
createUserRe = regexp.MustCompile(`^\/users[\/]*$`) | |
) | |
func homePage(w http.ResponseWriter, r *http.Request) { | |
fmt.Println("Endpoint Hit: homePage") | |
response := Response{Status: http.StatusOK, Response: "Welcome to the Simple API!"} | |
json.NewEncoder(w).Encode(response) | |
} | |
func userHandler(w http.ResponseWriter, r *http.Request) { | |
fmt.Println("Endpoint Hit: returnUser") | |
switch { | |
case r.Method == http.MethodGet && getUserRe.MatchString(r.URL.Path): | |
if len(Index) == 0 { | |
// if Index is empty, i.e,. no users | |
w.WriteHeader(http.StatusNotFound) | |
json.NewEncoder(w).Encode(Response{Status: http.StatusNotFound, Response: "Empty database"}) | |
} else { | |
matches := getUserRe.FindStringSubmatch(r.URL.Path) | |
user, ok := Index[matches[1]] // check if Index has user. | |
if len(matches) < 2 { | |
// if url in not in the format `/users/1` | |
w.WriteHeader(http.StatusNotFound) | |
json.NewEncoder(w).Encode(Response{Status: http.StatusNotFound, Response: "User not found."}) | |
} else if ok { | |
// if Index has the user | |
w.WriteHeader(http.StatusOK) | |
json.NewEncoder(w).Encode(Response{Status: http.StatusOK, Response: user}) | |
} else { | |
// if Index don't have any user | |
w.WriteHeader(http.StatusNotFound) | |
json.NewEncoder(w).Encode(Response{Status: http.StatusNotFound, Response: "User not found."}) | |
} | |
} | |
case r.Method == http.MethodPost && createUserRe.MatchString(r.URL.Path): | |
// case to handle adding a User; IDK if it works | |
var u User | |
if err := json.NewDecoder(r.Body).Decode(&u); err != nil { | |
w.WriteHeader(http.StatusInternalServerError) | |
json.NewEncoder(w).Encode(Response{Status: http.StatusInternalServerError, Response: "Internal Server Error."}) | |
return | |
} | |
Index[u.Id] = u | |
w.WriteHeader(http.StatusCreated) | |
json.NewEncoder(w).Encode(Response{Status: http.StatusCreated, Response: "User added"}) | |
} | |
} | |
func returnAllUsers(w http.ResponseWriter, r *http.Request) { | |
fmt.Println("Endpoint Hit: returnAllUsers") | |
json.NewEncoder(w).Encode(Index) | |
} | |
func handleRequests() { | |
http.HandleFunc("/", homePage) | |
http.HandleFunc("/users", returnAllUsers) | |
http.HandleFunc("/users/", userHandler) | |
log.Fatal(http.ListenAndServe(":8080", nil)) | |
} | |
func main() { | |
handleRequests() | |
} |
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