api.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	uuid "github.com/nu7hatch/gouuid"
 	"net/http"
 	"time"
 )
@@ -19,21 +20,38 @@ type Users struct {
 
 func UserGetHandler(w http.ResponseWriter, req *http.Request) {
 	if req.Method == "GET" {
+
+		title, ok := req.URL.Query()["title"]
+
+		if !ok || len(title[0]) < 1 {
+			http.Error(w, "Url Param 'title' is missing", 400)
+			return
+		}
+
+		// Query()["key"] will return an array of items,
+		// we only want the single item.
+		userTitle := title[0]
+
 		users := Users{}
 
-		err := queryRepos(&users)
+		err := queryRepos(&users, userTitle)
 		if err != nil {
 			http.Error(w, err.Error(), 500)
 			return
 		}
 
-		out, err := json.Marshal(users.users)
-		if err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
+		if len(users.users) > 0 {
 
-		fmt.Fprintf(w, string(out))
+			out, err := json.Marshal(users.users)
+			if err != nil {
+				http.Error(w, err.Error(), 500)
+				return
+			}
+
+			fmt.Fprintf(w, string(out))
+		} else {
+			fmt.Fprintf(w, "User does not exist")
+		}
 	} else {
 		fmt.Fprintf(w, "Sorry, only Get methods are supported for thus api.")
 	}
@@ -45,19 +63,26 @@ func UserPostHandler(w http.ResponseWriter, req *http.Request) {
 			fmt.Fprintf(w, "ParseForm() err: %v", err)
 			return
 		}
+
+		uuid, err := uuid.NewV4()
+		if err != nil {
+			http.Error(w, err.Error(), 500)
+
+		}
+
 		title := req.FormValue("title")
 		sqlInsert := `
-INSERT INTO users (title, created_on)
-VALUES ($1, $2)
+INSERT INTO users (title, created_on,uuid)
+VALUES ($1, $2, $3)
 RETURNING user_id`
 		if len(title) > 0 {
 			user_id := 0
-			row := db.QueryRow(sqlInsert, title, time.Now())
+			row := db.QueryRow(sqlInsert, title, time.Now().Format(time.RFC3339), uuid.String())
 			err := row.Scan(&user_id)
 			if err != nil {
 				panic(err)
 			}
-			fmt.Fprintf(w, "user creted")
+			fmt.Fprintf(w, "user created.")
 		} else {
 			fmt.Fprintf(w, "Invalid data")
 		}
@@ -66,15 +91,18 @@ RETURNING user_id`
 	}
 }
 
-func queryRepos(users *Users) error {
-	rows, err := db.Query(`
+func queryRepos(users *Users, userTitle string) error {
+	query := `
 		SELECT
      		user_id,
 			title,
 			created_on
 			
-		FROM users;
-		`)
+		FROM users
+		WHERE title='` + userTitle + `';
+		`
+
+	rows, err := db.Query(query)
 	if err != nil {
 		return err
 	}

go.mod

@@ -4,4 +4,5 @@ go 1.14
 
 require (
 	github.com/lib/pq v1.8.0
+	github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d
 )

scripts/db/ddl_01.sql

@@ -1 +1,2 @@
-CREATE TABLE users (user_id serial PRIMARY KEY, title VARCHAR ( 50 ) UNIQUE NOT NULL, created_on TIMESTAMP NOT NULL);
+CREATE TABLE users (user_id serial PRIMARY KEY, title VARCHAR ( 50 ) UNIQUE NOT NULL,
+ uuid VARCHAR ( 50 ) UNIQUE NOT NULL, created_on TIMESTAMP NOT NULL);