MyNSB/API

package filesint

// Interface package for core files within application

import (
    "bytes"
    "errors"
    "io"
    "os"
    "path/filepath"
    "mynsb-api/internal/util"
)


// UTILITY FUNCTIONS

// GetDirs returns all the directories associated with important information within the api, this includes:
// assets, sensitive data and database data
func GetDirs() map[string]string {

    gopath := util.GetGOPATH()
    return map[string]string{
        "assets": gopath + "/src/mynsb-api/assets",
        "sensitive": gopath + "/src/mynsb-api/sensitive",
        "database": gopath + "/src/mynsb-api/database",
    }
}


// LoadFile takes a src directory... e.g assets, sensitive, e.t.c and a path to a specific file within that directory and returns a file pointer to that file
func LoadFile(srcDir string, fileLoc string) (*os.File, error) {

    requestedDir := GetDirs()[srcDir]
    fullPath := filepath.FromSlash(requestedDir + fileLoc)

    // Determine if the file exists
    if _, notExists := os.Stat(fullPath); notExists != nil {
        return nil, errors.New("could not locate file")
    }

    f, _ := os.Open(requestedDir + fileLoc)
    return f, nil
}


// DataDump returns a data dump of all the data stored within a specific file
func DataDump(srcDir string, fileLoc string) ([]byte, error) {

    f, err := LoadFile(srcDir, fileLoc)
    defer f.Close()
    if err != nil {
        return nil, err
    }

    dataBuf := bytes.NewBuffer(nil)
    io.Copy(dataBuf, f)

    return dataBuf.Bytes(), nil
}


// CreateFile takes a src directory, parent directory and a file name and creates a new file at srcDrc/parentDir/newFile.*
func CreateFile(srcDir string, parentDir string, newFile string) (*os.File, error) {

    srcDirLoc := GetDirs()[srcDir]

    // Because os.Create does not create folders for us we need to split the creation into 2 parts, directory creation and file creation
    if _, err := os.Stat(srcDirLoc + parentDir); os.IsNotExist(err) {
        err := os.MkdirAll(srcDirLoc+parentDir, 0777)
        if err != nil {
            return nil, err
        }
    }

    // Now actually create the file
    return os.Create(srcDirLoc + parentDir + "/" + newFile)
}