Google calendar quickstart

.gitignore

@@ -5,6 +5,7 @@
 .dep
 *.hex
 *.log
+*env
 
 /oldstuff/intro-to-crafty/lib/crafty.js
 /oldstuff/intro-to-crafty/assets/*

wherewhen/.gitignore

@@ -0,0 +1 @@
+client_secret.json

wherewhen/find-wherewhen

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -o errexit
+
+main() {
+  if [[ "${DEBUG}" ]]; then
+    set -o xtrace
+  fi
+
+  if [[ "${*}" =~ -h|--help|help|wat ]]; then
+    __usage "${@}"
+    exit 0
+  fi
+
+  : "${TMPDIR:=/var/tmp}"
+
+  local tmpout="${TMPDIR}/find-wherewhen-$(date +%s).tmp"
+  local calendar_id="${1}"
+  shift || true
+
+  : "${START_TIME:=$(date --date='1 years ago' -Iseconds)}"
+  : "${END_TIME:=$(date -Iseconds)}"
+
+  if [[ ! "${calendar_id}" ]]; then
+    echo Missing \<calendar id\> positional argument
+    exit 1
+  fi
+
+  if [[ ! "${GOOGLE_API_TOKEN}" ]]; then
+    echo Missing \$GOOGLE_API_TOKEN
+    exit 1
+  fi
+
+  local url='https://www.googleapis.com/calendar/v3/calendars'
+  url="${url}/${calendar_id}/events"
+  local qs="${qs}maxResults=2500&orderBy=startTime&singleEvents=true"
+  qs="${qs}&timeMax=$(__qsval "${END_TIME}")"
+  qs="${qs}&timeMin=$(__qsval "${START_TIME}")"
+  qs="${qs}&fields=items(summary%2Cend%2FdateTime%2Clocation%2Cstart%2FdateTime)"
+  qs="${qs}&key=${GOOGLE_API_TOKEN}"
+
+  echo "GET ${url}?${qs}"
+  curl -X GET -s "${url}?${qs}" | jq . >"${tmpout}"
+  echo "${tmpout}"
+}
+
+
+__qsval() {
+  jq -r '.|@uri' <<<"\"${1}\""
+}
+
+__usage() {
+  cat <<EOF
+Usage: $(basename "${0}") <calendar-id> [-s|--start-time|-e|--end-time]
+
+Find where and when in a given time range (default past 1y).
+EOF
+}
+
+main "${@}"

wherewhen/quickstart.go

@@ -0,0 +1,137 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"os/user"
+	"path/filepath"
+	"time"
+
+	"golang.org/x/net/context"
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+	"google.golang.org/api/calendar/v3"
+)
+
+// getClient uses a Context and Config to retrieve a Token
+// then generate a Client. It returns the generated Client.
+func getClient(ctx context.Context, config *oauth2.Config) *http.Client {
+	cacheFile, err := tokenCacheFile()
+	if err != nil {
+		log.Fatalf("Unable to get path to cached credential file. %v", err)
+	}
+	tok, err := tokenFromFile(cacheFile)
+	if err != nil {
+		tok = getTokenFromWeb(config)
+		saveToken(cacheFile, tok)
+	}
+	return config.Client(ctx, tok)
+}
+
+// getTokenFromWeb uses Config to request a Token.
+// It 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 code string
+	if _, err := fmt.Scan(&code); err != nil {
+		log.Fatalf("Unable to read authorization code %v", err)
+	}
+
+	tok, err := config.Exchange(oauth2.NoContext, code)
+	if err != nil {
+		log.Fatalf("Unable to retrieve token from web %v", err)
+	}
+	return tok
+}
+
+// tokenCacheFile generates credential file path/filename.
+// It returns the generated credential path/filename.
+func tokenCacheFile() (string, error) {
+	usr, err := user.Current()
+	if err != nil {
+		return "", err
+	}
+	tokenCacheDir := filepath.Join(usr.HomeDir, ".credentials")
+	os.MkdirAll(tokenCacheDir, 0700)
+	return filepath.Join(tokenCacheDir,
+		url.QueryEscape("calendar-go-quickstart.json")), err
+}
+
+// tokenFromFile retrieves a Token from a given file path.
+// It returns the retrieved Token and any read error encountered.
+func tokenFromFile(file string) (*oauth2.Token, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return nil, err
+	}
+	t := &oauth2.Token{}
+	err = json.NewDecoder(f).Decode(t)
+	defer f.Close()
+	return t, err
+}
+
+// saveToken uses a file path to create a file and store the
+// token in it.
+func saveToken(file string, token *oauth2.Token) {
+	fmt.Printf("Saving credential file to: %s\n", file)
+	f, err := os.OpenFile(file, 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 main() {
+	ctx := context.Background()
+
+	b, err := ioutil.ReadFile("client_secret.json")
+	if err != nil {
+		log.Fatalf("Unable to read client secret file: %v", err)
+	}
+
+	// If modifying these scopes, delete your previously saved credentials
+	// at ~/.credentials/calendar-go-quickstart.json
+	config, err := google.ConfigFromJSON(b, calendar.CalendarReadonlyScope)
+	if err != nil {
+		log.Fatalf("Unable to parse client secret file to config: %v", err)
+	}
+	client := getClient(ctx, config)
+
+	srv, err := calendar.New(client)
+	if err != nil {
+		log.Fatalf("Unable to retrieve calendar Client %v", err)
+	}
+
+	t := time.Now().Format(time.RFC3339)
+	events, err := srv.Events.List("primary").ShowDeleted(false).
+		SingleEvents(true).TimeMin(t).MaxResults(10).OrderBy("startTime").Do()
+	if err != nil {
+		log.Fatalf("Unable to retrieve next ten of the user's events. %v", err)
+	}
+
+	fmt.Println("Upcoming events:")
+	if len(events.Items) > 0 {
+		for _, i := range events.Items {
+			var when string
+			// If the DateTime is an empty string the Event is an all-day Event.
+			// So only Date is available.
+			if i.Start.DateTime != "" {
+				when = i.Start.DateTime
+			} else {
+				when = i.Start.Date
+			}
+			fmt.Printf("%s (%s)\n", i.Summary, when)
+		}
+	} else {
+		fmt.Printf("No upcoming events found.\n")
+	}
+}