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gomojo.go
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gomojo.go
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// Copyright 2013 Manish Malik (manishmalik.name)
// All rights reserved.
// Use of this source code is governed by a BSD (3-Clause) License
// that can be found in the LICENSE file.
//
// I initially wrote bits of this for Instamojo integration with an app backend.
// Now it's a Golang package that can be used to interact with the API.
// The latest is at https://github.com/dotmanish/gomojo
//
// Check gomojo-tool.go for a comprehensive sample of API usage.
//
// Currently available APIs:
//
// Initialization:
// InitGomojoWithAuthToken
// InitGomojoWithUserPass
//
// Main APIs:
// ListOffers
// GetOfferDetails
// ArchiveOffer
// UploadFile
// CreateOffer
// UpdateOffer
// GetNewAuthToken
// DeleteAuthToken
//
// Helper Functions:
// GetCurrentAuthToken
//
package gomojo
import (
"bytes"
"encoding/json"
"io/ioutil"
"net/http"
"os"
"mime/multipart"
"path/filepath"
"io"
"net/url"
)
// ListOffersResponse: represents response of 'offer' API
type ListOffersResponse struct {
Offers []Offer `json:"offers"`
Success bool `json:"success"`
Message string `json:"message"`
}
// OfferDetailsResponse: represents response of 'offer' details,'createoffer','updateoffer' API
type OfferDetailsResponse struct {
Offer Offer `json:"offer"`
Success bool `json:"success"`
Message string `json:"message"`
}
// ArchiveResponse: represents response of 'archiveoffer' DELETE API
type ArchiveResponse struct {
Message string `json:"message"`
Success bool `json:"success"`
}
// FileUploadResonse: represents response of 'getfileuploadurl' POST API
type FileUploadResonse struct {
UploadURL string `json:"upload_url"`
Message string `json:"message"`
Success bool `json:"success"`
UploadJSON string // Additional field populated later with upload response JSON
}
// AuthResponse: represents response of 'auth' POST API
type AuthResponse struct {
Token string `json:"token"`
Message string `json:"message"`
Success bool `json:"success"`
}
// DeAuthResponse: represents response of 'auth' DELETE API
type DeAuthResponse struct {
Message string `json:"message"`
Success bool `json:"success"`
}
// Offer: represents one Offer object (in list of offers)
// This is an amalgamation of the fields received as a
// result of various APIs (Offers List / Offer Details)
// Note that Offers List API doesn't populate everything.
type Offer struct {
ShortURL string `json:"shorturl"`
Title string `json:"title"`
Slug string `json:"slug"`
Status string `json:"status"`
Description string `json:"description"`
Currency string `json:"currency"`
BasePrice string `json:"base_price"`
Quantity string `json:"quantity"`
StartDate string `json:"start_date"`
EndDate string `json:"end_date"`
Timezone string `json:"timezone"`
Venue string `json:"venue"`
RedirectURL string `json:"redirect_url"`
Note string `json:"note"`
FileUploadJSON string `json:"file_upload_json"`
CoverImageJSON string `json:"cover_image_json"`
}
var gomojo_app_id, gomojo_auth_token, gomojo_api_ver, gomojo_version string
var gomojo_username, gomojo_password string
var gomojo_init_done bool
// InitGomojoWithAuthToken: Initialize gomojo with Auth Token
// Inputs: (API version string, App ID string, Auth Token string)
func InitGomojoWithAuthToken(api_ver, app_id, auth_token string) {
if api_ver != "" && app_id != "" && auth_token != "" {
gomojo_app_id = app_id
gomojo_auth_token = auth_token
gomojo_api_ver = api_ver
gomojo_init_done = true
}
}
// initGomojoWithUserPass: Initialize gomojo with username/password
// Inputs: (API version string, App ID string, Username string, Password string)
// Note: The username/password are internally stored in gomojo variables
// until the first attempt to call an API. Afterwards, these internal variables
// are blanked out.
func InitGomojoWithUserPass(api_ver, app_id, username, password string) {
if api_ver != "" && app_id != "" && username != "" && password != "" {
gomojo_app_id = app_id
gomojo_api_ver = api_ver
// These variables are reset to blank once they're used
gomojo_username = username
gomojo_password = password
gomojo_init_done = true
}
}
// GetCurrentAuthToken: returns the current Auth Token
// Inputs: None
// Returns (Auth Token string)
func GetCurrentAuthToken() string {
return gomojo_auth_token
}
// SetCurrentAuthToken: sets the current Auth Token
// Inputs: (Auth Token string)
func SetCurrentAuthToken(auth_token string) {
gomojo_auth_token = auth_token
}
// ListOffers: retrieves the list of all offers created under the given App(ID)
// Inputs: None
// Returns: (Offer object array, API success bool, Message string)
func ListOffers() ([]Offer, bool, string) {
jsonobj := new(ListOffersResponse)
if gomojo_init_done {
api_result := callAPI("listoffers", "", "")
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Offers, jsonobj.Success, jsonobj.Message
}
// GetOfferDetails: retrieves the details of a particular offer
// Inputs: (Offer-Slug string)
// Returns: (Offer object, API success bool, Message string)
func GetOfferDetails(offer_slug string) (Offer, bool, string) {
jsonobj := new(OfferDetailsResponse)
if gomojo_init_done {
api_result := callAPI("offerdetails", offer_slug, "")
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Offer, jsonobj.Success, jsonobj.Message
}
// ArchiveOffer: archives an existing Offer
// Inputs: (Offer Slug string)
// Returns: (API success bool, Message string)
func ArchiveOffer(offer_slug string) (bool, string) {
jsonobj := new(ArchiveResponse)
if gomojo_init_done {
api_result := callAPI("offer", offer_slug, "")
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Success, jsonobj.Message
}
// UploadFile: uploads a File (content) or Cover Image
// Inputs: (File Path string)
// Returns: (API success bool, APUI Message string, UploadURL string, Upload-File JSON string)
func UploadFile(file_path string) (bool, string, string, string) {
jsonobj := new(FileUploadResonse)
if gomojo_init_done {
api_result := callAPI("getfileuploadurl", "", "")
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
if jsonobj.Success {
// Check for file existence and readability
file, err := os.Open(file_path)
if err != nil {
jsonobj.Message = err.Error()
} else {
defer file.Close()
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
part, err := writer.CreateFormFile("fileUpload", filepath.Base(file_path))
if err != nil {
jsonobj.Message = err.Error()
} else {
_, err = io.Copy(part, file)
err = writer.Close()
if err != nil {
jsonobj.Message = err.Error()
} else {
client := &http.Client{}
request, _ := http.NewRequest("POST", jsonobj.UploadURL, body)
resp, err := client.Do(request)
if err != nil {
jsonobj.Message = err.Error()
} else {
respbody := &bytes.Buffer{}
_, err := respbody.ReadFrom(resp.Body)
if err != nil {
jsonobj.Message = err.Error()
} else {
resp.Body.Close()
jsonobj.UploadJSON = respbody.String()
}
}
}
}
}
}
return jsonobj.Success, jsonobj.Message, jsonobj.UploadURL, jsonobj.UploadJSON
}
// CreateOffer: create a new offer
// Inputs: (Offer object)
// Returns: (Offer object, API success bool, Message string)
func CreateOffer(offer Offer) (Offer, bool, string) {
jsonobj := new(OfferDetailsResponse)
if gomojo_init_done {
api_data := "title=" + url.QueryEscape(offer.Title) +
"&description=" + url.QueryEscape(offer.Description) +
"¤cy=" + url.QueryEscape(offer.Currency) +
"&base_price=" + url.QueryEscape(offer.BasePrice) +
"&quantity=" + url.QueryEscape(offer.Quantity) +
"&start_date=" + url.QueryEscape(offer.StartDate) +
"&end_date=" + url.QueryEscape(offer.EndDate) +
"&timezone=" + url.QueryEscape(offer.Timezone) +
"&venue=" + url.QueryEscape(offer.Venue) +
"&redirect_url=" + url.QueryEscape(offer.RedirectURL) +
"¬e=" + url.QueryEscape(offer.Note) +
"&file_upload_json=" + url.QueryEscape(offer.FileUploadJSON) +
"&cover_image_json=" + url.QueryEscape(offer.CoverImageJSON)
api_result := callAPI("createoffer", "", api_data)
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Offer, jsonobj.Success, jsonobj.Message
}
// UpdateOffer: update an existing offer
// Inputs: (Offer-slug string, Offer object)
// Returns: (Offer object, API success bool, Message string)
func UpdateOffer(offer_slug string, offer Offer) (Offer, bool, string) {
jsonobj := new(OfferDetailsResponse)
if gomojo_init_done {
api_data := "title=" + url.QueryEscape(offer.Title) +
"&description=" + url.QueryEscape(offer.Description) +
"¤cy=" + url.QueryEscape(offer.Currency) +
"&base_price=" + url.QueryEscape(offer.BasePrice) +
"&quantity=" + url.QueryEscape(offer.Quantity) +
"&start_date=" + url.QueryEscape(offer.StartDate) +
"&end_date=" + url.QueryEscape(offer.EndDate) +
"&timezone=" + url.QueryEscape(offer.Timezone) +
"&venue=" + url.QueryEscape(offer.Venue) +
"&redirect_url=" + url.QueryEscape(offer.RedirectURL) +
"¬e=" + url.QueryEscape(offer.Note) +
"&file_upload_json=" + url.QueryEscape(offer.FileUploadJSON) +
"&cover_image_json=" + url.QueryEscape(offer.CoverImageJSON)
api_result := callAPI("updateoffer", offer_slug, api_data)
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Offer, jsonobj.Success, jsonobj.Message
}
// GetNewAuthToken: gets a new Auth Token
// Inputs: (Username string, Password string)
// Returns: (Auth Token string, API success bool, Message string)
func GetNewAuthToken(username, password string) (string, bool, string) {
jsonobj := new(AuthResponse)
if gomojo_init_done {
api_result := callAPI("auth", "", "username="+username+"&password="+password)
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Token, jsonobj.Success, jsonobj.Message
}
// DeleteAuthToken: deletes an existing Auth Token
// Inputs: (Auth Token string)
// Returns: (API success bool, Message string)
func DeleteAuthToken(auth_token string) (bool, string) {
jsonobj := new(DeAuthResponse)
if gomojo_init_done {
api_result := callAPI("deauth", auth_token, "")
jsonerr := json.Unmarshal([]byte(api_result), jsonobj)
if jsonerr != nil {
jsonobj.Message = "Invalid JSON: " + jsonerr.Error()
}
} else {
jsonobj.Message = "Please call gomojo.InitGomojoWithAuthToken() or gomojo.InitGomojoWithUserPass() first."
}
return jsonobj.Success, jsonobj.Message
}
// callAPI: Internal function handling the REST API
// Valid apicall values: "auth", "deauth", "listoffers"
func callAPI(apicall, apitarget, apidata string) string {
// Check if we have auth token available.
// If not, let's first authenticate and retrieve it.
if apicall != "auth" && gomojo_auth_token == "" {
new_auth_token, new_auth_success, _ := GetNewAuthToken(gomojo_username, gomojo_password)
gomojo_username = ""
gomojo_password = ""
if new_auth_token == "" || !new_auth_success {
api_result := "{\"success\":false, \"message\":\"Unable to get a valid Auth Token from API.\" }"
return api_result
} else {
gomojo_auth_token = new_auth_token
}
}
api_result := ""
client := &http.Client{}
api_method := "GET" // overridden later
var param_data []byte
var param_reader *bytes.Reader
param_data = ([]byte)("")
// Decide on the HTTP Method and Parameters
if apicall == "auth" {
api_method = "POST"
param_data = ([]byte)(apidata)
} else if apicall == "deauth" {
api_method = "DELETE"
apicall = "auth/" + apitarget
} else if apicall == "listoffers" {
api_method = "GET"
apicall = "offer"
} else if apicall == "offerdetails" {
api_method = "GET"
apicall = "offer/" + apitarget
} else if apicall == "archiveoffer" {
api_method = "DELETE"
apicall = "offer/" + apitarget
} else if apicall == "getfileuploadurl" {
api_method = "GET"
apicall = "offer/" + "get_file_upload_url"
} else if apicall == "createoffer" {
api_method = "POST"
apicall = "offer"
param_data = ([]byte)(apidata)
} else if apicall == "updateoffer" {
api_method = "PATCH"
apicall = "offer/" + apitarget
param_data = ([]byte)(apidata)
} else {
api_method = "GET"
}
// Make the API URL to call
api_url := "https://www.instamojo.com/api/" + gomojo_api_ver + "/" + apicall + "/"
param_reader = bytes.NewReader(param_data)
req, err := http.NewRequest(api_method, api_url, param_reader)
if err == nil {
req.Header.Add("X-App-Id", gomojo_app_id)
if apicall != "auth" {
req.Header.Add("X-Auth-Token", gomojo_auth_token)
}
resp, resperr := client.Do(req)
if resperr != nil {
api_result = "{\"success\":false, \"message\":\"Error connecting to or retrieving response from API URL. Please check connectivity. API URL: " + api_url + "\" }"
} else {
defer resp.Body.Close()
bodybytes, _ := ioutil.ReadAll(resp.Body)
api_result = string(bodybytes)
}
}
return api_result
}