Add: put tag on file

pkg/api/api.go

@@ -87,6 +87,8 @@ func NewAPI(config Config) (*API, error) {
 	apiMux.HandleFunc("/get_tag_info", api.HandleGetTagInfo)
 	apiMux.HandleFunc("/insert_tag", api.HandleInsertTag)
 	apiMux.HandleFunc("/update_tag", api.HandleUpdateTag)
+	apiMux.HandleFunc("/put_tag_on_file", api.HandlePutTagOnFile)
+	apiMux.HandleFunc("/get_tags_on_file", api.HandleGetTagsOnFile)
 	// below needs token
 	apiMux.HandleFunc("/walk", api.HandleWalk)
 	apiMux.HandleFunc("/reset", api.HandleReset)

pkg/api/handle_error.go

@@ -10,6 +10,7 @@ import (
 var (
 	ErrNotLoggedIn = errors.New("not logged in")
 	ErrNotAdmin = errors.New("not admin")
+	ErrEmpty = errors.New("Empty field detected, please fill in all fields")
 )
 
 type Error struct {

pkg/api/handle_tag_and_file.go

@@ -0,0 +1,82 @@
+package api
+
+import (
+	"encoding/json"
+	"log"
+	"msw-open-music/pkg/database"
+	"net/http"
+)
+
+type PutTagOnFileRequest struct {
+	TagID  int64 `json:"tag_id"`
+	FileID int64 `json:"file_id"`
+}
+
+func (api *API) HandlePutTagOnFile(w http.ResponseWriter, r *http.Request) {
+	// check if the user is admin
+	err := api.CheckAdmin(w, r)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+
+	req := &PutTagOnFileRequest{}
+	err = json.NewDecoder(r.Body).Decode(req)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+
+	userID, err := api.GetUserID(w, r)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+
+	// check empty
+	if req.TagID == 0 || req.FileID == 0 {
+		api.HandleError(w, r, ErrEmpty)
+		return
+	}
+
+	log.Println("Put tag on file request:", req, "userID:", userID)
+
+	api.Db.PutTagOnFile(req.TagID, req.FileID, userID)
+
+	api.HandleOK(w, r)
+}
+
+type GetTagsOnFileRequest struct {
+	ID int64 `json:"id"`
+}
+
+type GetTagsOnFileResponse struct {
+	Tags []*database.Tag `json:"tags"`
+}
+
+func (api *API) HandleGetTagsOnFile(w http.ResponseWriter, r *http.Request) {
+	req := &GetTagsOnFileRequest{}
+	err := json.NewDecoder(r.Body).Decode(req)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+	
+	log.Println("Get tags on file request:", req)
+
+	tags, err := api.Db.GetTagsOnFile(req.ID)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+
+	resp := &GetTagsOnFileResponse{
+		Tags: tags,
+	}
+
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+}

pkg/database/method_tag_and_file.go

@@ -0,0 +1,25 @@
+package database
+
+func (database *Database) PutTagOnFile(tagID, fileID, userID int64) error {
+	_, err := database.stmt.putTagOnFile.Exec(tagID, fileID, userID)
+	return err
+}
+
+func (database *Database) GetTagsOnFile(fileID int64) ([]*Tag, error) {
+	rows, err := database.stmt.getTagsOnFile.Query(fileID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	tags := make([]*Tag, 0)
+	for rows.Next() {
+		tag := &Tag{}
+		err = rows.Scan(&tag.ID, &tag.Name, &tag.Description, &tag.CreatedByUserId)
+		if err != nil {
+			return nil, err
+		}
+		tags = append(tags, tag)
+	}
+	return tags, nil
+}

pkg/database/sql_stmt.go

@@ -190,6 +190,14 @@ JOIN users ON tags.created_by_user_id = users.id
 
 var updateTagQuery = `UPDATE tags SET name = ?, description = ? WHERE id = ?;`
 
+var putTagOnFileQuery = `INSERT INTO file_has_tag (tag_id, file_id, user_id) VALUES (?, ?, ?);`
+
+var getTagsOnFileQuery = `SELECT
+tags.id, tags.name, tags.description, tags.created_by_user_id
+FROM file_has_tag
+JOIN tags ON file_has_tag.tag_id = tags.id
+WHERE file_has_tag.file_id = ?;`
+
 type Stmt struct {
 	initFilesTable     *sql.Stmt
 	initFoldersTable   *sql.Stmt
@@ -226,6 +234,8 @@ type Stmt struct {
 	getTag             *sql.Stmt
 	getTags            *sql.Stmt
 	updateTag          *sql.Stmt
+	putTagOnFile       *sql.Stmt
+	getTagsOnFile      *sql.Stmt
 }
 
 func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
@@ -506,5 +516,17 @@ func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
 		return nil, err
 	}
 
+	// init putTagOnFile
+	stmt.putTagOnFile, err = sqlConn.Prepare(putTagOnFileQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init getTagsOnFile
+	stmt.getTagsOnFile, err = sqlConn.Prepare(getTagsOnFileQuery)
+	if err != nil {
+		return nil, err
+	}
+
 	return stmt, err
 }