.gitignore

@@ -0,0 +1 @@
+config.yaml

config.yaml_example

@@ -0,0 +1,8 @@
+mysql:
+  dsn: user:pass@tcp(localhost:3306)/dbname
+  query: SELECT email FROM your_table WHERE email IS NOT NULL
+
+mailchimp:
+  api_key: your_mailchimp_api_key
+  server: us21
+  audience_id: your_audience_id

go.mod

@@ -0,0 +1,29 @@
+module sync-mailchimp
+
+go 1.24.3
+
+require (
+	github.com/go-sql-driver/mysql v1.9.2
+	github.com/sirupsen/logrus v1.9.3
+	github.com/spf13/cobra v1.9.1
+	github.com/spf13/viper v1.20.1
+)
+
+require (
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/fsnotify/fsnotify v1.8.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/sagikazarmark/locafero v0.7.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.12.0 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	github.com/spf13/pflag v1.0.6 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,67 @@
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+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
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+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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mailchimp/mailchimp.go

@@ -0,0 +1,114 @@
+package mailchimp
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+)
+
+type MailchimpAPI struct {
+	APIKey     string
+	Server     string
+	AudienceID string
+}
+
+type Member struct {
+	EmailAddress string `json:"email_address"`
+	Status       string `json:"status_if_new,omitempty"`
+}
+
+func NewMailchimpAPI() *MailchimpAPI {
+	return &MailchimpAPI{
+		APIKey:     viper.GetString("mailchimp.api_key"),
+		Server:     viper.GetString("mailchimp.server"),
+		AudienceID: viper.GetString("mailchimp.audience_id"),
+	}
+}
+
+func (api *MailchimpAPI) emailHash(email string) string {
+	hash := md5.Sum([]byte(strings.ToLower(email)))
+	return hex.EncodeToString(hash[:])
+}
+
+func (api *MailchimpAPI) EmailExists(email string) (bool, error) {
+	hash := api.emailHash(email)
+	url := fmt.Sprintf("https://%s.api.mailchimp.com/3.0/lists/%s/members/%s",
+		api.Server,
+		api.AudienceID,
+		hash)
+
+	req, _ := http.NewRequest("GET", url, nil)
+	req.SetBasicAuth("anystring", api.APIKey)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	return resp.StatusCode == http.StatusOK, nil
+}
+
+func (api *MailchimpAPI) AddEmail(email string) error {
+	url := fmt.Sprintf("https://%s.api.mailchimp.com/3.0/lists/%s/members",
+		api.Server,
+		api.AudienceID)
+
+	member := Member{
+		EmailAddress: email,
+		Status:       "subscribed",
+	}
+	body, _ := json.Marshal(member)
+
+	req, _ := http.NewRequest("POST", url, strings.NewReader(string(body)))
+	req.SetBasicAuth("anystring", api.APIKey)
+	req.Header.Add("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("failed to add email: %s", email)
+	}
+	return nil
+}
+
+func (api *MailchimpAPI) TagEmail(email, tag string) error {
+	hash := api.emailHash(email)
+	url := fmt.Sprintf("https://%s.api.mailchimp.com/3.0/lists/%s/members/%s/tags",
+		api.Server,
+		api.AudienceID,
+		hash)
+
+	body := map[string]interface{}{
+		"tags": []map[string]string{
+			{"name": tag, "status": "active"},
+		},
+	}
+	jsonBody, _ := json.Marshal(body)
+
+	req, _ := http.NewRequest("POST", url, strings.NewReader(string(jsonBody)))
+	req.SetBasicAuth("anystring", api.APIKey)
+	req.Header.Add("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		logrus.Errorf("Tagging failed: status %d", resp.StatusCode)
+		return fmt.Errorf("failed to tag email: %s", email)
+	}
+	return nil
+}
+

main.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+	"sync-mailchimp/mailchimp"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+type Member struct {
+	EmailAddress string `json:"email_address"`
+	Status       string `json:"status_if_new,omitempty"`
+}
+
+func initConfig() {
+	viper.SetConfigName("config")
+	viper.AddConfigPath(".")
+	viper.AutomaticEnv()
+
+	if err := viper.ReadInConfig(); err != nil {
+		logrus.Fatalf("Error reading config file: %v", err)
+	}
+}
+
+func getEmailsFromMySQL() ([]string, error) {
+	db, err := sql.Open("mysql", viper.GetString("mysql.dsn"))
+	if err != nil {
+		return nil, err
+	}
+	defer db.Close()
+
+	rows, err := db.Query(viper.GetString("mysql.query"))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var emails []string
+	for rows.Next() {
+		var email string
+		if err := rows.Scan(&email); err == nil {
+			emails = append(emails, strings.ToLower(strings.TrimSpace(email)))
+		}
+	}
+	return emails, nil
+}
+
+var rootCmd = &cobra.Command{
+	Use:   "sync-mailchimp",
+	Short: "Sync MySQL emails with Mailchimp",
+	Run: func(cmd *cobra.Command, args []string) {
+		emails, err := getEmailsFromMySQL()
+		if err != nil {
+			logrus.Fatalf("MySQL error: %v", err)
+		}
+
+		api := mailchimp.NewMailchimpAPI()
+
+		var toAdd []string
+		for _, email := range emails {
+			exists, err := api.EmailExists(email)
+			if err != nil {
+				logrus.Warnf("Check failed for %s: %v", email, err)
+				continue
+			}
+			if !exists {
+				toAdd = append(toAdd, email)
+			}
+		}
+
+		if len(toAdd) > 0 {
+			fmt.Printf("%d emails not found. Sync? [y/N]: ", len(toAdd))
+			var input string
+			fmt.Scanln(&input)
+			if strings.ToLower(input) == "y" {
+				for _, email := range toAdd {
+					if err := api.AddEmail(email); err != nil {
+						logrus.Errorf("Failed to add %s: %v", email, err)
+					} else {
+						logrus.Infof("Added %s", email)
+					}
+				}
+			}
+		}
+
+		tag := time.Now().Format("January 2006")
+		for _, email := range emails {
+			if err := api.TagEmail(email, tag); err != nil {
+				logrus.Warnf("Failed to tag %s: %v", email, err)
+			} else {
+				logrus.Infof("Tagged %s with %s", email, tag)
+			}
+		}
+	},
+}
+
+func main() {
+	cobra.OnInitialize(initConfig)
+	if err := rootCmd.Execute(); err != nil {
+		logrus.Fatalf("Command failed: %v", err)
+	}
+}