toolkit

README

Toolkit

A simple example of how to create a reusable Go module with commonly used tools.

The included tools are:

• Read JSON
• Write JSON
• Produce a JSON encoded error response
• Upload a file to a specified directory
• Download a static file
• Get a random string of length n
• Post JSON to a remote service
• Create a directory, including all parent directories, if it does not already exist
• Create a URL safe slug from a string

Installation

go get -u github.com/molu8bits/toolkit

Documentation

Index

• type JSONResponse
• type Tools
  • func (t *Tools) CreateDirIfNotExist(path string) error
  • func (t *Tools) DownloadStaticFile(w http.ResponseWriter, r *http.Request, pathName, displayName string)
  • func (t *Tools) ErrorJSON(w http.ResponseWriter, err error, status ...int) error
  • func (t *Tools) PushJSONToRemote(uri string, data interface{}, client ...*http.Client) (*http.Response, int, error)
  • func (t *Tools) RandomString(n int) string
  • func (t *Tools) ReadJSON(w http.ResponseWriter, r *http.Request, data interface{}) error
  • func (t *Tools) Slugify(s string) (string, error)
  • func (t *Tools) UploadFiles(r *http.Request, uploadDir string, rename ...bool) ([]*UploadedFile, error)
  • func (t *Tools) UploadOneFile(r *http.Request, uploadDir string, rename ...bool) (*UploadedFile, error)
  • func (t *Tools) WriteJSON(w http.ResponseWriter, status int, data interface{}, headers ...http.Header) error
• type UploadedFile

Types

type JSONResponse

type JSONResponse struct {
	Error   bool   `json:"error"`
	Message string `json:"message"`
	//Data    interface{} `json:"data,omitempty"`
	Data interface{} `json:"data,omitempty"`
}

JSONResponse is the type used for sending JSON around

type Tools

type Tools struct {
	MaxFileSize        int
	AllowedFileTypes   []string
	MaxJSONSize        int
	AllowUnknownFields bool
}

Tools is the type used to instantiate this module. Any variable of this type will have access to all the methods with the receiver *Tools

func (*Tools) CreateDirIfNotExist

func (t *Tools) CreateDirIfNotExist(path string) error

CreateDirIfNotExist creates a directory, and all necessary parents, if it does not exist

func (*Tools) DownloadStaticFile

func (t *Tools) DownloadStaticFile(w http.ResponseWriter, r *http.Request, pathName, displayName string)

DownloadStaticFile downloads a file, and tries to force the browser to avoid displaying it in the browser window by setting content disposition. It also allows specification of the display file

func (*Tools) ErrorJSON

func (t *Tools) ErrorJSON(w http.ResponseWriter, err error, status ...int) error

ErrorJSON takes an error, and optionally a status code, and generates and sends a JSON error message

func (*Tools) PushJSONToRemote

func (t *Tools) PushJSONToRemote(uri string, data interface{}, client ...*http.Client) (*http.Response, int, error)

PushJSONToRemote posts arbitrary data to some URL as JSON, and returns the response, status code and error, if any. The final parameter, client, is optional. If none is specified, we use the standard http.Client.

func (*Tools) RandomString

func (t *Tools) RandomString(n int) string

RandomString returns a string of random characters of length n, using randomStringSource as the source for the string

func (*Tools) ReadJSON

func (t *Tools) ReadJSON(w http.ResponseWriter, r *http.Request, data interface{}) error

ReadJSON tries to read the body of a request and converts from json into a go data variable

func (*Tools) Slugify

func (t *Tools) Slugify(s string) (string, error)

Slugify is a (very) simple means of creating a slug from a string

func (*Tools) UploadFiles

func (t *Tools) UploadFiles(r *http.Request, uploadDir string, rename ...bool) ([]*UploadedFile, error)

UploadFiles uploads one or more file to a specified directory, and gives the files a random name It returns a slice containing the newly named files, the original file names, the size of the file and potentially an error. If the optional last parameter is set to true, then we will not rename the files, but will use the original file names.

func (*Tools) UploadOneFile

func (t *Tools) UploadOneFile(r *http.Request, uploadDir string, rename ...bool) (*UploadedFile, error)

UploadOneFile is just a convenience method that calls UploadFiles, but expects only one file be in the upload.

func (*Tools) WriteJSON

func (t *Tools) WriteJSON(w http.ResponseWriter, status int, data interface{}, headers ...http.Header) error

WriteJSON takes a response status code and arbitrary data and writes json to the client

type UploadedFile

type UploadedFile struct {
	NewFileName      string
	OriginalFileName string
	FileSize         int64
}

UploadedFile is a struct to save information about an uploaded file