first db support

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Usare IntelliSense per informazioni sui possibili attributi.
+    // Al passaggio del mouse vengono visualizzate le descrizioni degli attributi esistenti.
+    // Per altre informazioni, visitare: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "./cmd/webapi"
+        }
+    ]
+}

doc/api.yaml

@@ -256,15 +256,9 @@ paths:
                   username:
                     $ref: "#/components/schemas/name"
                   followers:
-                    type: array
-                    description: Array of users that the user is following.
-                    items:
-                      $ref: "#/components/schemas/uid_name"
+                    $ref: "#/components/schemas/followers_n"
                   following:
-                    type: array
-                    description: Array of users that are following the user.
-                    items:
-                      $ref: "#/components/schemas/uid_name"
+                    $ref: "#/components/schemas/following_n"
                   photos:
                     $ref: "#/components/schemas/user_photo_stream"
         '404':

service/database/database.go

@@ -55,11 +55,78 @@ func New(db *sql.DB) (AppDatabase, error) {
 		return nil, errors.New("database is required when building a AppDatabase")
 	}
 
-	// Check if table exists. If not, the database is empty, and we need to create the structure
+	// Check if tables exist. If not, the database is empty, and we need to create the structure
 	var tableName string
-	err := db.QueryRow(`SELECT name FROM sqlite_master WHERE type='table' AND name='example_table';`).Scan(&tableName)
+	err := db.QueryRow(`SELECT name FROM sqlite_master WHERE type='table' AND name='users';`).Scan(&tableName) //todo: check for all the tables
 	if errors.Is(err, sql.ErrNoRows) {
-		sqlStmt := `CREATE TABLE example_table (id INTEGER NOT NULL PRIMARY KEY, name TEXT);`
+		sqlStmt := `CREATE TABLE "users" (
+			"uid"	TEXT NOT NULL,
+			"name"	TEXT NOT NULL UNIQUE,
+			PRIMARY KEY("uid")
+		)` //todo: one query is enough! Why do I need to do this?
+		_, err = db.Exec(sqlStmt)
+		if err != nil {
+			return nil, fmt.Errorf("error creating database structure: %w", err)
+		}
+		sqlStmt = `CREATE TABLE "follows" (
+			"follower"	TEXT NOT NULL,
+			"followed"	TEXT NOT NULL,
+			FOREIGN KEY("follower") REFERENCES "users"("uid") ON UPDATE CASCADE,
+			FOREIGN KEY("followed") REFERENCES "users"("uid") ON UPDATE CASCADE,
+			PRIMARY KEY("follower","followed")
+		)`
+		_, err = db.Exec(sqlStmt)
+		if err != nil {
+			return nil, fmt.Errorf("error creating database structure: %w", err)
+		}
+		sqlStmt = `CREATE TABLE "bans" (
+			"user"	TEXT NOT NULL,
+			"ban"	TEXT NOT NULL,
+			FOREIGN KEY("user") REFERENCES "users"("uid") ON UPDATE CASCADE,
+			FOREIGN KEY("ban") REFERENCES "users"("uid") ON UPDATE CASCADE,
+			PRIMARY KEY("user","ban")
+		)`
+		_, err = db.Exec(sqlStmt)
+		if err != nil {
+			return nil, fmt.Errorf("error creating database structure: %w", err)
+		}
+		sqlStmt = `CREATE TABLE "photos" (
+			"user"	TEXT NOT NULL,
+			"id"	INTEGER NOT NULL,
+			"date"	TEXT NOT NULL,
+			FOREIGN KEY("user") REFERENCES "users"("uid") ON UPDATE CASCADE,
+			PRIMARY KEY("id" AUTOINCREMENT)
+		)`
+		_, err = db.Exec(sqlStmt)
+		if err != nil {
+			return nil, fmt.Errorf("error creating database structure: %w", err)
+		}
+		sqlStmt = `CREATE TABLE "comments" (
+			"user"	TEXT NOT NULL,
+			"photo"	INTEGER NOT NULL,
+			"id"	INTEGER NOT NULL,
+			"comment"	TEXT NOT NULL,
+			"date"	TEXT NOT NULL,
+			FOREIGN KEY("user") REFERENCES "users"("uid"),
+			PRIMARY KEY("id" AUTOINCREMENT),
+			FOREIGN KEY("photo") REFERENCES "photos"("id")
+		);`
+		_, err = db.Exec(sqlStmt)
+		if err != nil {
+			return nil, fmt.Errorf("error creating database structure: %w", err)
+		}
+		sqlStmt = `CREATE TABLE "likes" (
+			"user"	TEXT NOT NULL,
+			"photo_id"	INTEGER NOT NULL,
+			FOREIGN KEY("user") REFERENCES "users"("uid") ON UPDATE CASCADE,
+			FOREIGN KEY("photo_id") REFERENCES "photos"("id") ON UPDATE CASCADE,
+			PRIMARY KEY("user","photo_id")
+		)`
+		_, err = db.Exec(sqlStmt)
+		if err != nil {
+			return nil, fmt.Errorf("error creating database structure: %w", err)
+		}
+		sqlStmt = `PRAGMA foreign_keys = ON`
 		_, err = db.Exec(sqlStmt)
 		if err != nil {
 			return nil, fmt.Errorf("error creating database structure: %w", err)

service/database/db-photos.go

@@ -0,0 +1,53 @@
+package database
+
+import "time"
+
+type Photo struct {
+	ID       int64
+	Likes    int64
+	Comments int64
+}
+
+type UserProfile struct {
+	UID       string
+	Name      string
+	Following []string
+	Followers []string
+	Photos    []Photo
+}
+
+// Post a new photo
+func (db *appdbimpl) PostPhoto(uid string) (int64, error) {
+	res, err := db.c.Exec(`INSERT INTO "photos" ("user", "date") VALUES (?, ?)`, uid, time.Now().Format(time.RFC3339))
+	if err != nil {
+		return 0, err
+	}
+	id, err := res.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+	return id, nil
+}
+
+// Get user profile, including username, followers, following, and photos
+func (db *appdbimpl) GetUserProfile(uid string) (*UserProfile, error) {
+	// Get user info
+	var name string
+	err := db.c.QueryRow(`SELECT "name" FROM "users" WHERE "uid" = ?`, uid).Scan(&name)
+	if err != nil {
+		return nil, err
+	}
+	// Get followers
+}
+
+// Like a photo
+func (db *appdbimpl) LikePhoto(uid string, photo int64) error {
+	_, err := db.c.Exec(`INSERT INTO "likes" ("user", "photo_id") VALUES (?, ?)`, uid, photo)
+	return err
+}
+
+// Unlike a photo
+func (db *appdbimpl) UnlikePhoto(uid string, photo int64) error {
+	_, err := db.c.Exec(`DELETE FROM "likes" WHERE "user" = ? AND "photo_id" = ?`, uid, photo)
+	return err
+}

service/database/db-users.go

@@ -0,0 +1,31 @@
+package database
+
+// Create a new user
+func (db *appdbimpl) CreateUser(uid string, name string) error {
+	_, err := db.c.Exec(`INSERT INTO "users" ("uid", "name") VALUES (?, ?)`, uid, name)
+	return err
+}
+
+// Follow a user
+func (db *appdbimpl) FollowUser(uid string, follow string) error {
+	_, err := db.c.Exec(`INSERT INTO "follows" ("follower", "followed") VALUES (?, ?)`, uid, follow)
+	return err
+}
+
+// Unfollow a user
+func (db *appdbimpl) UnfollowUser(uid string, unfollow string) error {
+	_, err := db.c.Exec(`DELETE FROM "follows" WHERE "follower" = ? AND "followed" = ?`, uid, unfollow)
+	return err
+} //todo: should return boolean or something similar
+
+// Ban a user
+func (db *appdbimpl) BanUser(uid string, ban string) error {
+	_, err := db.c.Exec(`INSERT INTO "bans" ("user", "ban") VALUES (?, ?)`, uid, ban)
+	return err
+}
+
+// Unban a user
+func (db *appdbimpl) UnbanUser(uid string, unban string) error {
+	_, err := db.c.Exec(`DELETE FROM "bans" WHERE "user" = ? AND "ban" = ?`, uid, unban)
+	return err
+}

service/database/get-name.go

@@ -1,8 +0,0 @@
-package database
-
-// GetName is an example that shows you how to query data
-func (db *appdbimpl) GetName() (string, error) {
-	var name string
-	err := db.c.QueryRow("SELECT name FROM example_table WHERE id=1").Scan(&name)
-	return name, err
-}