cmd/events/main.go - website - Git at Google

 // Copyright 2019 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 package main

 import (
 	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
 	"os"
 	"path"
 	"strings"
 	"time"

 	"github.com/microcosm-cc/bluemonday"
 	"gopkg.in/yaml.v2"
 )

 const (
 	// eventLimit is the maximum number of events that will be output.
 	eventLimit = 15
 	// groupsSummaryPath is an API endpoint that returns global Go groups.
 	// Fetching from this API path allows to sort groups by next upcoming event.
 	groupsSummaryPath = "/pro/go/es_groups_summary?location=global&order=next_event&desc=false"
 	// eventsHeader is a header comment for the output content.
 	eventsHeader = `# DO NOT EDIT: Autogenerated from cmd/events.
 # To update, run:
 #    go run ./cmd/events > go.dev/_content/events.yaml`
 )

 func main() {
 	c := &meetupAPI{
 		baseURL: "https://api.meetup.com",
 	}
 	ue, err := getUpcomingEvents(c)
 	if err != nil {
 		log.Fatal(err)
 	}
 	printYAML(ue)
 }

 type client interface {
 	getGroupsSummary() (*GroupsSummary, error)
 	getGroup(urlName string) (*Group, error)
 }

 // getUpcomingEvents returns upcoming events globally.
 func getUpcomingEvents(c client) (*UpcomingEvents, error) {
 	summary, err := c.getGroupsSummary()
 	if err != nil {
 		return nil, err
 	}
 	p := bluemonday.NewPolicy()
 	p.AllowStandardURLs()
 	p.AllowAttrs("href").OnElements("a")
 	p.AllowElements("br")
 	// Work around messy newlines in content.
 	r := strings.NewReplacer("\n", "<br/>\n", "&lt;br&gt;", "<br/>\n")
 	var events []EventData
 	for _, chapter := range summary.Chapters {
 		if len(events) >= eventLimit {
 			break
 		}
 		group, err := c.getGroup(chapter.URLName)
 		if err != nil || group.NextEvent == nil {
 			continue
 		}
 		tz, err := time.LoadLocation(group.Timezone)
 		if err != nil {
 			tz = time.UTC
 		}
 		// group.NextEvent.Time is in milliseconds since UTC epoch.
 		nextEventTime := time.Unix(group.NextEvent.Time/1000, 0).In(tz)
 		events = append(events, EventData{
 			City:              chapter.City,
 			Country:           chapter.Country,
 			Description:       r.Replace(p.Sanitize(chapter.Description)), // Event descriptions are often blank, use Group description.
 			ID:                group.NextEvent.ID,
 			LocalDate:         nextEventTime.Format("Jan 2, 2006"),
 			LocalTime:         nextEventTime.Format(time.RFC3339),
 			LocalizedCountry:  group.LocalizedCountryName,
 			LocalizedLocation: group.LocalizedLocation,
 			Name:              group.NextEvent.Name,
 			PhotoURL:          chapter.GroupPhoto.PhotoLink,
 			State:             chapter.State,
 			ThumbnailURL:      chapter.GroupPhoto.ThumbLink,
 			URL:               "https://www.meetup.com/" + path.Join(chapter.URLName, "events", group.NextEvent.ID),
 		})
 	}
 	return &UpcomingEvents{All: events}, nil
 }

 type meetupAPI struct {
 	baseURL string
 }

 func (c *meetupAPI) getGroupsSummary() (*GroupsSummary, error) {
 	resp, err := http.Get(c.baseURL + groupsSummaryPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get events from %q: %v", groupsSummaryPath, err)
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("failed to get events from %q: %v", groupsSummaryPath, resp.Status)
 	}
 	var summary *GroupsSummary
 	d := json.NewDecoder(resp.Body)
 	if err := d.Decode(&summary); err != nil {
 		return summary, fmt.Errorf("failed to decode events from %q: %w", groupsSummaryPath, err)
 	}
 	return summary, nil
 }

 // getGroup fetches group details, which are useful for getting details of the next upcoming event, and timezones.
 func (c *meetupAPI) getGroup(urlName string) (*Group, error) {
 	u := c.baseURL + "/" + urlName
 	resp, err := http.Get(u)
 	if err != nil {
 		return nil, fmt.Errorf("failed to fetch group details from %q: %w", u, err)
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("failed to fetch group details from %q: %v", u, resp.Status)
 	}

 	var group Group
 	d := json.NewDecoder(resp.Body)
 	if err := d.Decode(&group); err != nil {
 		return nil, fmt.Errorf("failed to decode group from %q: %w", u, err)
 	}
 	return &group, nil
 }

 func printYAML(v interface{}) {
 	fmt.Println(eventsHeader)
 	e := yaml.NewEncoder(os.Stdout)
 	defer e.Close()
 	if err := e.Encode(v); err != nil {
 		log.Fatalf("failed to encode event yaml: %v", err)
 	}
 }

 // UpcomingEvents is a list of EventData written out to YAML for rendering in Hugo.
 type UpcomingEvents struct {
 	All []EventData
 }

 // EventData is the structure written out to YAML for rendering in Hugo.
 type EventData struct {
 	City              string
 	Country           string
 	Description       string
 	ID                string
 	LocalDate         string `yaml:"local_date"`
 	LocalTime         string `yaml:"local_time"`
 	LocalizedCountry  string
 	LocalizedLocation string
 	Name              string
 	PhotoURL          string
 	State             string
 	ThumbnailURL      string
 	URL               string
 }

 // GroupsSummary is the structure returned from /pro/go/es_groups_summary.
 type GroupsSummary struct {
 	Chapters []*Chapter
 }

 type Event struct {
 	Created       int    `json:"created"`
 	Description   string `json:"description"`
 	Duration      int    `json:"duration"`
 	Fee           *Fee   `json:"fee"`
 	Group         *Group `json:"group"`
 	LocalDate     string `json:"local_date"`
 	LocalTime     string `json:"local_time"`
 	ID            string `json:"id"`
 	Link          string `json:"link"`
 	Name          string `json:"name"`
 	RSVPLimit     int    `json:"rsvp_limit"`
 	Status        string `json:"status"`
 	Time          int64  `json:"time"`
 	UTCOffset     int    `json:"utc_offset"`
 	Updated       int    `json:"updated"`
 	Venue         *Venue `json:"venue"`
 	WaitlistCount int    `json:"waitlist_count"`
 	YesRSVPCount  int    `json:"yes_rsvp_count"`
 }

 type Venue struct {
 	Address1             string  `json:"address_1"`
 	Address2             string  `json:"address_2"`
 	Address3             string  `json:"address_3"`
 	City                 string  `json:"city"`
 	Country              string  `json:"country"`
 	ID                   int     `json:"id"`
 	Lat                  float64 `json:"lat"`
 	LocalizedCountryName string  `json:"localized_country_name"`
 	Lon                  float64 `json:"lon"`
 	Name                 string  `json:"name"`
 	Repinned             bool    `json:"repinned"`
 	State                string  `json:"state"`
 	Zip                  string  `json:"zip"`
 }

 type Group struct {
 	Country              string  `json:"country"`
 	Created              int     `json:"created"`
 	Description          string  `json:"description"`
 	ID                   int     `json:"id"`
 	JoinMode             string  `json:"join_mode"`
 	Lat                  float64 `json:"lat"`
 	LocalizedLocation    string  `json:"localized_location"`
 	LocalizedCountryName string  `json:"localized_country_name"`
 	Lon                  float64 `json:"lon"`
 	Name                 string  `json:"name"`
 	NextEvent            *Event  `json:"next_event"`
 	Region               string  `json:"region"`
 	Timezone             string  `json:"timezone"`
 	URLName              string  `json:"urlname"`
 	Who                  string  `json:"who"`
 }

 type Fee struct {
 	Accepts     string  `json:"accepts"`
 	Amount      float64 `json:"amount"`
 	Currency    string  `json:"currency"`
 	Description string  `json:"description"`
 	Label       string  `json:"label"`
 	Required    bool    `json:"required"`
 }

 type Chapter struct {
 	AverageAge     float64        `json:"average_age"`
 	Category       []Category     `json:"category"`
 	City           string         `json:"city"`
 	Country        string         `json:"country"`
 	Description    string         `json:"description"`
 	FoundedDate    int64          `json:"founded_date"`
 	GenderFemale   float64        `json:"gender_female"`
 	GenderMale     float64        `json:"gender_male"`
 	GenderOther    float64        `json:"gender_other"`
 	GenderUnknown  float64        `json:"gender_unknown"`
 	GroupPhoto     GroupPhoto     `json:"group_photo"`
 	ID             int            `json:"id"`
 	LastEvent      int64          `json:"last_event"`
 	Lat            float64        `json:"lat"`
 	Lon            float64        `json:"lon"`
 	MemberCount    int            `json:"member_count"`
 	Name           string         `json:"name"`
 	NextEvent      int64          `json:"next_event"`
 	OrganizerPhoto OrganizerPhoto `json:"organizer_photo"`
 	Organizers     []Organizer    `json:"organizers"`
 	PastEvents     int            `json:"past_events"`
 	PastRSVPs      int            `json:"past_rsvps"`
 	ProJoinDate    int64          `json:"pro_join_date"`
 	RSVPsPerEvent  float64        `json:"rsvps_per_event"`
 	RepeatRSVPers  int            `json:"repeat_rsvpers"`
 	State          string         `json:"state"`
 	Status         string         `json:"status"`
 	Topics         []Topic        `json:"topics"`
 	URLName        string         `json:"urlname"`
 	UpcomingEvents int            `json:"upcoming_events"`
 }

 type Topic struct {
 	ID     int    `json:"id"`
 	Name   string `json:"name"`
 	URLkey string `json:"urlkey"`
 	Lang   string `json:"lang"`
 }

 type Category struct {
 	ID        int    `json:"id"`
 	Name      string `json:"name"`
 	Shortname string `json:"shortname"`
 	SortName  string `json:"sort_name"`
 }

 type Organizer struct {
 	Name       string `json:"name"`
 	MemberID   int    `json:"member_id"`
 	Permission string `json:"permission"`
 }

 type OrganizerPhoto struct {
 	BaseURL     string `json:"base_url"`
 	HighresLink string `json:"highres_link"`
 	ID          int    `json:"id"`
 	PhotoLink   string `json:"photo_link"`
 	ThumbLink   string `json:"thumb_link"`
 	Type        string `json:"type"`
 }

 type GroupPhoto struct {
 	BaseURL     string `json:"base_url"`
 	HighresLink string `json:"highres_link"`
 	ID          int    `json:"id"`
 	PhotoLink   string `json:"photo_link"`
 	ThumbLink   string `json:"thumb_link"`
 	Type        string `json:"type"`
 }
	// Copyright 2019 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.
	package main

	import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"os"
	"path"
	"strings"
	"time"

	"github.com/microcosm-cc/bluemonday"
	"gopkg.in/yaml.v2"
	)

	const (
	// eventLimit is the maximum number of events that will be output.
	eventLimit = 15
	// groupsSummaryPath is an API endpoint that returns global Go groups.
	// Fetching from this API path allows to sort groups by next upcoming event.
	groupsSummaryPath = "/pro/go/es_groups_summary?location=global&order=next_event&desc=false"
	// eventsHeader is a header comment for the output content.
	eventsHeader = `# DO NOT EDIT: Autogenerated from cmd/events.
	# To update, run:
	# go run ./cmd/events > go.dev/_content/events.yaml`
	)

	func main() {
	c := &meetupAPI{
	baseURL: "https://api.meetup.com",
	}
	ue, err := getUpcomingEvents(c)
	if err != nil {
	log.Fatal(err)
	}
	printYAML(ue)
	}

	type client interface {
	getGroupsSummary() (*GroupsSummary, error)
	getGroup(urlName string) (*Group, error)
	}

	// getUpcomingEvents returns upcoming events globally.
	func getUpcomingEvents(c client) (*UpcomingEvents, error) {
	summary, err := c.getGroupsSummary()
	if err != nil {
	return nil, err
	}
	p := bluemonday.NewPolicy()
	p.AllowStandardURLs()
	p.AllowAttrs("href").OnElements("a")
	p.AllowElements("br")
	// Work around messy newlines in content.
	r := strings.NewReplacer("\n", "<br/>\n", "<br>", "<br/>\n")
	var events []EventData
	for _, chapter := range summary.Chapters {
	if len(events) >= eventLimit {
	break
	}
	group, err := c.getGroup(chapter.URLName)
	if err != nil \|\| group.NextEvent == nil {
	continue
	}
	tz, err := time.LoadLocation(group.Timezone)
	if err != nil {
	tz = time.UTC
	}
	// group.NextEvent.Time is in milliseconds since UTC epoch.
	nextEventTime := time.Unix(group.NextEvent.Time/1000, 0).In(tz)
	events = append(events, EventData{
	City: chapter.City,
	Country: chapter.Country,
	Description: r.Replace(p.Sanitize(chapter.Description)), // Event descriptions are often blank, use Group description.
	ID: group.NextEvent.ID,
	LocalDate: nextEventTime.Format("Jan 2, 2006"),
	LocalTime: nextEventTime.Format(time.RFC3339),
	LocalizedCountry: group.LocalizedCountryName,
	LocalizedLocation: group.LocalizedLocation,
	Name: group.NextEvent.Name,
	PhotoURL: chapter.GroupPhoto.PhotoLink,
	State: chapter.State,
	ThumbnailURL: chapter.GroupPhoto.ThumbLink,
	URL: "https://www.meetup.com/" + path.Join(chapter.URLName, "events", group.NextEvent.ID),
	})
	}
	return &UpcomingEvents{All: events}, nil
	}

	type meetupAPI struct {
	baseURL string
	}

	func (c meetupAPI) getGroupsSummary() (GroupsSummary, error) {
	resp, err := http.Get(c.baseURL + groupsSummaryPath)
	if err != nil {
	return nil, fmt.Errorf("failed to get events from %q: %v", groupsSummaryPath, err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
	return nil, fmt.Errorf("failed to get events from %q: %v", groupsSummaryPath, resp.Status)
	}
	var summary *GroupsSummary
	d := json.NewDecoder(resp.Body)
	if err := d.Decode(&summary); err != nil {
	return summary, fmt.Errorf("failed to decode events from %q: %w", groupsSummaryPath, err)
	}
	return summary, nil
	}

	// getGroup fetches group details, which are useful for getting details of the next upcoming event, and timezones.
	func (c meetupAPI) getGroup(urlName string) (Group, error) {
	u := c.baseURL + "/" + urlName
	resp, err := http.Get(u)
	if err != nil {
	return nil, fmt.Errorf("failed to fetch group details from %q: %w", u, err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
	return nil, fmt.Errorf("failed to fetch group details from %q: %v", u, resp.Status)
	}

	var group Group
	d := json.NewDecoder(resp.Body)
	if err := d.Decode(&group); err != nil {
	return nil, fmt.Errorf("failed to decode group from %q: %w", u, err)
	}
	return &group, nil
	}

	func printYAML(v interface{}) {
	fmt.Println(eventsHeader)
	e := yaml.NewEncoder(os.Stdout)
	defer e.Close()
	if err := e.Encode(v); err != nil {
	log.Fatalf("failed to encode event yaml: %v", err)
	}
	}

	// UpcomingEvents is a list of EventData written out to YAML for rendering in Hugo.
	type UpcomingEvents struct {
	All []EventData
	}

	// EventData is the structure written out to YAML for rendering in Hugo.
	type EventData struct {
	City string
	Country string
	Description string
	ID string
	LocalDate string `yaml:"local_date"`
	LocalTime string `yaml:"local_time"`
	LocalizedCountry string
	LocalizedLocation string
	Name string
	PhotoURL string
	State string
	ThumbnailURL string
	URL string
	}

	// GroupsSummary is the structure returned from /pro/go/es_groups_summary.
	type GroupsSummary struct {
	Chapters []*Chapter
	}

	type Event struct {
	Created int `json:"created"`
	Description string `json:"description"`
	Duration int `json:"duration"`
	Fee *Fee `json:"fee"`
	Group *Group `json:"group"`
	LocalDate string `json:"local_date"`
	LocalTime string `json:"local_time"`
	ID string `json:"id"`
	Link string `json:"link"`
	Name string `json:"name"`
	RSVPLimit int `json:"rsvp_limit"`
	Status string `json:"status"`
	Time int64 `json:"time"`
	UTCOffset int `json:"utc_offset"`
	Updated int `json:"updated"`
	Venue *Venue `json:"venue"`
	WaitlistCount int `json:"waitlist_count"`
	YesRSVPCount int `json:"yes_rsvp_count"`
	}

	type Venue struct {
	Address1 string `json:"address_1"`
	Address2 string `json:"address_2"`
	Address3 string `json:"address_3"`
	City string `json:"city"`
	Country string `json:"country"`
	ID int `json:"id"`
	Lat float64 `json:"lat"`
	LocalizedCountryName string `json:"localized_country_name"`
	Lon float64 `json:"lon"`
	Name string `json:"name"`
	Repinned bool `json:"repinned"`
	State string `json:"state"`
	Zip string `json:"zip"`
	}

	type Group struct {
	Country string `json:"country"`
	Created int `json:"created"`
	Description string `json:"description"`
	ID int `json:"id"`
	JoinMode string `json:"join_mode"`
	Lat float64 `json:"lat"`
	LocalizedLocation string `json:"localized_location"`
	LocalizedCountryName string `json:"localized_country_name"`
	Lon float64 `json:"lon"`
	Name string `json:"name"`
	NextEvent *Event `json:"next_event"`
	Region string `json:"region"`
	Timezone string `json:"timezone"`
	URLName string `json:"urlname"`
	Who string `json:"who"`
	}

	type Fee struct {
	Accepts string `json:"accepts"`
	Amount float64 `json:"amount"`
	Currency string `json:"currency"`
	Description string `json:"description"`
	Label string `json:"label"`
	Required bool `json:"required"`
	}

	type Chapter struct {
	AverageAge float64 `json:"average_age"`
	Category []Category `json:"category"`
	City string `json:"city"`
	Country string `json:"country"`
	Description string `json:"description"`
	FoundedDate int64 `json:"founded_date"`
	GenderFemale float64 `json:"gender_female"`
	GenderMale float64 `json:"gender_male"`
	GenderOther float64 `json:"gender_other"`
	GenderUnknown float64 `json:"gender_unknown"`
	GroupPhoto GroupPhoto `json:"group_photo"`
	ID int `json:"id"`
	LastEvent int64 `json:"last_event"`
	Lat float64 `json:"lat"`
	Lon float64 `json:"lon"`
	MemberCount int `json:"member_count"`
	Name string `json:"name"`
	NextEvent int64 `json:"next_event"`
	OrganizerPhoto OrganizerPhoto `json:"organizer_photo"`
	Organizers []Organizer `json:"organizers"`
	PastEvents int `json:"past_events"`
	PastRSVPs int `json:"past_rsvps"`
	ProJoinDate int64 `json:"pro_join_date"`
	RSVPsPerEvent float64 `json:"rsvps_per_event"`
	RepeatRSVPers int `json:"repeat_rsvpers"`
	State string `json:"state"`
	Status string `json:"status"`
	Topics []Topic `json:"topics"`
	URLName string `json:"urlname"`
	UpcomingEvents int `json:"upcoming_events"`
	}

	type Topic struct {
	ID int `json:"id"`
	Name string `json:"name"`
	URLkey string `json:"urlkey"`
	Lang string `json:"lang"`
	}

	type Category struct {
	ID int `json:"id"`
	Name string `json:"name"`
	Shortname string `json:"shortname"`
	SortName string `json:"sort_name"`
	}

	type Organizer struct {
	Name string `json:"name"`
	MemberID int `json:"member_id"`
	Permission string `json:"permission"`
	}

	type OrganizerPhoto struct {
	BaseURL string `json:"base_url"`
	HighresLink string `json:"highres_link"`
	ID int `json:"id"`
	PhotoLink string `json:"photo_link"`
	ThumbLink string `json:"thumb_link"`
	Type string `json:"type"`
	}

	type GroupPhoto struct {
	BaseURL string `json:"base_url"`
	HighresLink string `json:"highres_link"`
	ID int `json:"id"`
	PhotoLink string `json:"photo_link"`
	ThumbLink string `json:"thumb_link"`
	Type string `json:"type"`
	}