Added config validation

.gitignore

@@ -46,8 +46,4 @@ tags
 # Persistent undo
 [._]*.un~
 
-# Misc
-.DS_Store
-dist/
-
 # End of https://www.toptal.com/developers/gitignore/api/go,vim

.goreleaser.yaml

@@ -1,5 +0,0 @@
-gitea_urls:
-  api: https://git.handmadecities.com/api/v1
-  download: https://git.handmadecities.com/
-  # set to true if you use a self-signed certificate
-  skip_tls_verify: false

config.toml

@@ -0,0 +1,18 @@
+# User Constants - Update as needed
+batch_size  = 500 # Max 500 messages per batch: https://postmarkapp.com/developer/api/templates-api#send-batch-with-templates
+test_email  = "" # Fill this in with your own email address
+
+# Handmade Cities Credentials - DON'T TOUCH
+[hmc]
+api_url       = "https://api.handmadecities.com/v1/meetups/subscribers"
+shared_secret = "Land_OF_TERminA__MAJORAS_LAIR#666!"
+city          = "Termina"
+
+# Postmark App Credentials - NO TOUCHY TOUCHY
+[postmark]
+server_token   = "37967b9a-6b1c-430e-a65f-de043de3e568"
+api_url        = "https://api.postmarkapp.com/email/batchWithTemplates"
+template_id    = 35682307
+sender_name    = "Skull Kid"
+sender_email   = "majora@handmadecities.com"
+message_stream = "termina"

main.go

@@ -1,20 +1,20 @@
 // Meetup Invite 2000
 // @author: Abner Coimbre <abner@handmadecities.com>
-// Copyright (c) Handmade Cities LLC
+// Copyright (c) 2024 Handmade Cities
 
 // Based off News Blaster 2000 from the Handmade Network: https://git.handmade.network/hmn/newsblaster2000
 
 // ============================    Contributors    =========================
 // Bug & warning fixes
 //  Jacob Bell (@MysteriousJ)
-//  Asaf Gartner (@AsafGartner)
-//  Joshua Barnett (@jshbrntt)
-//  Jack Punter (@TarriestPython)
+//  Asaf Gartner
 //
 // Emotional Support
-//  Cucui Ganon Rosario: https://www.youtube.com/watch?v=bvCsTca0uBc
+//  Cucui Ganon Rosario
 // =========================================================================
 
+// WARNING: This program requires a companion config.toml file provided by Abner. Without it we will crash!
+
 package main
 
 import (
@@ -44,7 +44,7 @@ type Config struct {
 		ApiUrl       string `toml:"api_url"`
 		SharedSecret string `toml:"shared_secret"`
 		City         string `toml:"city"`
-	} `toml:"hmc"`
+	}
 	Postmark struct {
 		ServerToken   string `toml:"server_token"`
 		ApiUrl        string `toml:"api_url"`
@@ -113,21 +113,15 @@ func retrieveSubscribers(cfg *Config) ([]string, error) {
 		return nil, errors.New("response format error: 'emails' field not found")
 	}
 
-	/* De-duplicate emails using a map */
+	/* Convert emails to []string */
 	/* *** */
-	emailMap := make(map[string]bool)
+	var subscribers []string
 	for _, email := range emails {
 		if emailStr, ok := email.(string); ok {
-			emailMap[emailStr] = true
+			subscribers = append(subscribers, emailStr)
 		}
 	}
 
-	/* Convert the map keys back to a slice */
-	var subscribers []string
-	for email := range emailMap {
-		subscribers = append(subscribers, email)
-	}
-
 	return subscribers, nil
 }
 
@@ -282,13 +276,6 @@ func blastMail(cfg *Config, logFile string, trackingFile string, audience []stri
 		}
 	}
 
-	existingReaderCount := len(sentToAddresses)
-	newReaderCount := 0
-
-	if existingReaderCount > 0 {
-		fmt.Println("Same email file specified: Sending only to new subscribers...")
-	}
-
 	var group []string
 	for _, a := range audience {
 		if a == "" {
@@ -306,19 +293,14 @@ func blastMail(cfg *Config, logFile string, trackingFile string, audience []stri
 			if len(group) == cfg.BatchSize {
 				results, err := sendMail(cfg, group, subject, body)
 				if err != nil {
+					fmt.Printf("Error while sending mail: %v\n", err)
 					return
 				}
 				sentToAddresses = append(sentToAddresses, group...)
 				os.WriteFile(trackingFile, []byte(strings.Join(sentToAddresses, "\n")), 0666)
-				var failed []string
 				for i, res := range results {
 					log.WriteString(fmt.Sprintf("%s: %s\n", group[i], res.Message))
-					if res.ErrorCode != 0 {
-						failed = append(failed, group[i])
-					}
 				}
-				printBatchSummary(group, failed)
-				newReaderCount += len(group)
 				group = group[0:0]
 			}
 		}
@@ -326,28 +308,14 @@ func blastMail(cfg *Config, logFile string, trackingFile string, audience []stri
 	if len(group) > 0 {
 		results, err := sendMail(cfg, group, subject, body)
 		if err != nil {
+			fmt.Printf("Error while sending mail: %v\n", err)
 			return
 		}
 		sentToAddresses = append(sentToAddresses, group...)
 		os.WriteFile(trackingFile, []byte(strings.Join(sentToAddresses, "\n")), 0666)
-		var failed []string
 		for i, res := range results {
 			log.WriteString(fmt.Sprintf("%s: %s\n", group[i], res.Message))
-			if res.ErrorCode != 0 {
-				failed = append(failed, group[i])
-			}
 		}
-		printBatchSummary(group, failed)
-		newReaderCount += len(group)
-	}
-
-	if newReaderCount > 0 {
-		newSubscribers := existingReaderCount > 0
-		if newSubscribers {
-			fmt.Printf("Sent to %d new subscribers!\n", newReaderCount)
-		}
-	} else {
-		fmt.Printf("Not sent (no new subscribers)\n")
 	}
 }
 
@@ -377,47 +345,8 @@ type PostmarkBatchResult struct {
 	Message   string `json:"Message"`
 }
 
-func printBatchSummary(sent, failed []string) {
-	if len(failed) == 0 {
-		fmt.Printf("\033[32m✅ Sent %d messages\033[0m\n", len(sent))
-	} else {
-		successCount := len(sent) - len(failed)
-		if successCount < 0 {
-			successCount = 0
-		}
-		fmt.Printf("\033[31m❌ Sent %d, failed %d\033[0m\n", successCount, len(failed))
-		for _, f := range failed {
-			fmt.Printf("  - %s\n", f)
-		}
-	}
-}
-
 func sendMail(cfg *Config, recipients []string, subject, html string) ([]PostmarkBatchResult, error) {
-	/* Start a tiny spinner while the HTTP call runs.
-	 * Uses \r to update the same line. Stops as soon as the network call returns.
-	 */
-
-	stop := make(chan struct{})
-	done := make(chan struct{})
-	go func() {
-		frames := []rune{'|', '/', '-', '\\'}
-		i := 0
-		for {
-			select {
-			case <-stop:
-				close(done)
-				return
-			default:
-				fmt.Printf("\rSending batch [%d recipients]... %c", len(recipients), frames[i%len(frames)])
-				i++
-				time.Sleep(120 * time.Millisecond)
-			}
-		}
-	}()
-
-	/*
-	 * Prepare and make the network call
-	 */
+	fmt.Printf("Sending batch [%d recipients]...", len(recipients))
 
 	from := cfg.Postmark.SenderEmail
 	if cfg.Postmark.SenderName != "" {
@@ -447,21 +376,13 @@ func sendMail(cfg *Config, recipients []string, subject, html string) ([]Postmar
 
 	req, err := http.NewRequest(http.MethodPost, "https://api.postmarkapp.com/email/batchWithTemplates", bytes.NewReader(reqBody))
 	if err != nil {
-		// stop spinner before returning
-		close(stop)
-		<-done
-		fmt.Printf("\r")
 		return nil, err
 	}
-
 	req.Header.Set("Accept", "application/json")
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("X-Postmark-Server-Token", cfg.Postmark.ServerToken)
 	res, err := postmarkClient.Do(req)
 	if err != nil {
-		close(stop)
-		<-done
-		fmt.Printf("\r\033[31m❌ Sending batch [%d recipients]... error: %v\033[0m\n", len(recipients), err)
 		return nil, err
 	}
 
@@ -469,30 +390,17 @@ func sendMail(cfg *Config, recipients []string, subject, html string) ([]Postmar
 	resBody, err := io.ReadAll(res.Body)
 	res.Body.Close()
 	if err != nil {
-		close(stop)
-		<-done
-		fmt.Printf("\r")
 		return nil, err
 	}
-
 	if res.StatusCode != 200 {
-		close(stop)
-		<-done
-		fmt.Printf("\r\033[31m❌ Bad response from postmark: %d\033[0m\n", res.StatusCode)
 		return nil, fmt.Errorf("Bad response from postmark: %d", res.StatusCode)
 	}
-
 	err = json.Unmarshal(resBody, &results)
 	if err != nil {
-		close(stop)
-		<-done
-		fmt.Printf("\r\033[33m⚠️  Batch sent but failed to parse Postmark response\033[0m\n")
+		fmt.Printf("Batch sent successfully, but failed to parse response from postmark.\n")
 		return nil, nil
 	}
-
-	close(stop)
-	<-done
-	fmt.Printf("\r\033[32m✅ Emailed batch of %d recipients\033[0m\n", len(recipients))
+	fmt.Printf("Done.\n")
 	return results, nil
 }
 
@@ -555,10 +463,10 @@ func main() {
 		Run: func(cmd *cobra.Command, args []string) {
 			fmt.Printf(`Instructions:
 	1. Create an email file
-		* Call it whatever you want. Markdown format is expected
-		* Newlines at the beginning and end will be trimmed
-		* The first line is your email subject. It MUST start with the # symbol
-		* The rest of the file is your email's body
+		* Name it whatever you want. Markdown is expected
+		* Any newlines at the start or end of the file will be removed
+		* The first line of the file will be used as {{ subject }} in the postmark template. It must start with the # symbol
+		* The rest of the file will be used as {{{ content_body }}}
 
 	2. See who's subscribed
 		* ./meetupinvite2000 dump
@@ -567,15 +475,15 @@ func main() {
 
 	3. Do a test run
 		* ./meetupinvite2000 test [email file]
-		* You must send a test before blasting to everyone (please update config.toml to change test recipient)
-		* If you modify the email after testing, you must test again. Otherwise we will complain
+		* You must send a test email before blasting it to everyone (update config.toml to change test recipient)
+		* If you modify the email file after testing, you must test again. Otherwise MeetupInvite2000 will complain
 
 	4. Start blasting!
 		* ./meetupinvite2000 blast [email file]
-		* Batch sends your invite using our Email API (Postmark)
-		* Produces .track file that tracks email addresses we attempted to send to
-		* Produces .log file with information received back from Postmark
-		* In case of errors, you can always blast again. Addresses already in .track file will be skipped
+		* Will batch send your invite using our Email API (Postmark)
+		* Will produce a .track file that will list all email addresses that we attempted to send to
+		* In case of error, you can blast again. All emails listed in the .track file will be skipped
+		* Will produce a .log file with information received back from Postmark
 `)
 		},
 	}
@@ -597,7 +505,7 @@ func main() {
 				indexStr = strings.Repeat(" ", maxIndexWidth-len(indexStr)) + indexStr // Right-align the index
 				fmt.Printf("%s. \033[1m%s\033[0m\n", indexStr, email)
 			}
-			fmt.Printf("\nMailing list grows automatically as more subscribe at \033[1mhandmadecities.com/meetups/%s\033[0m\n", config.Postmark.MessageStream)
+			fmt.Printf("\nMailing list grows automatically as more subscribe at \033[1mhandmadecities.com/meetups\033[0m\n")
 		},
 	}