quickstart.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"

	"strconv"
	"strings"

	"golang.org/x/net/context"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	"google.golang.org/api/sheets/v4"
)

// Retrieve a token, saves the token, then returns the generated client.
func getClient(config *oauth2.Config) *http.Client {
	// The file token.json stores the user's access and refresh tokens, and is
	// created automatically when the authorization flow completes for the first
	// time.
	tokFile := "token.json"
	tok, err := tokenFromFile(tokFile)
	if err != nil {
		tok = getTokenFromWeb(config)
		saveToken(tokFile, tok)
	}
	return config.Client(context.Background(), tok)
}

// Request a token from the web, then returns the retrieved token.
func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
	authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
	fmt.Printf("Go to the following link in your browser then type the "+
		"authorization code: \n%v\n", authURL)

	var authCode string
	if _, err := fmt.Scan(&authCode); err != nil {
		log.Fatalf("Unable to read authorization code: %v", err)
	}

	tok, err := config.Exchange(context.TODO(), authCode)
	if err != nil {
		log.Fatalf("Unable to retrieve token from web: %v", err)
	}
	return tok
}

// Retrieves a token from a local file.
func tokenFromFile(file string) (*oauth2.Token, error) {
	f, err := os.Open(file)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	tok := &oauth2.Token{}
	err = json.NewDecoder(f).Decode(tok)
	return tok, err
}

// Saves a token to a file path.
func saveToken(path string, token *oauth2.Token) {
	fmt.Printf("Saving credential file to: %s\n", path)
	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
	if err != nil {
		log.Fatalf("Unable to cache oauth token: %v", err)
	}
	defer f.Close()
	json.NewEncoder(f).Encode(token)
}

func GetRuns(spreadsheetId string, rangeString string) []Run {
	b, err := ioutil.ReadFile("credentials.json")
	if err != nil {
		log.Fatalf("Unable to read client secret file: %v", err)
	}

	// If modifying these scopes, delete your previously saved token.json.
	config, err := google.ConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets.readonly")
	if err != nil {
		log.Fatalf("Unable to parse client secret file to config: %v", err)
	}
	client := getClient(config)

	srv, err := sheets.New(client)
	if err != nil {
		log.Fatalf("Unable to retrieve Sheets client: %v", err)
	}

	// Prints the names and majors of students in a sample spreadsheet:
	// https://docs.google.com/spreadsheets/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms/edit

	ranges := strings.Split(rangeString, ",") //strings.Split("A2:C6,E2:G6,I2:K6", ",")
	resp, err := srv.Spreadsheets.Values.BatchGet(spreadsheetId).Ranges(ranges...).Do()
	if err != nil {
		log.Fatalf("Unable to retrieve data from sheet: %v", err)
	}

	var runs = make([]Run, 0)
	if len(resp.ValueRanges) == 0 {
		fmt.Println("No data found.")
	} else {
		// parsing each
		for batchNum, batch := range resp.ValueRanges {
			if len(batch.Values) > 0 {
				fmt.Println("new run ", batchNum)
				var run = make([]Person, 0)
				for _, batchValues := range batch.Values {

					if len(batchValues) == 3 {
						fmt.Println("new char")
						dmg, err := strconv.Atoi(batchValues[2].(string))
						if err != nil {
							fmt.Println("wat, random dmg value cant be made from ", batchValues[2])
						}
						var runner = Person{
							Name: batchValues[0].(string),
							Buff: ClassToBuffMapping[strings.ToUpper(batchValues[1].(string))],
							Class: strings.ToUpper(batchValues[1].(string)),
							Dmg:  dmg,
						}
						run = append(run, runner)
					}
				}
				runs = append(runs, Run{Runners: run})
			}
		}
	}

	return runs
}