From 0197d9cd493b5785bca05f476856540ec64da64a Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sat, 7 Aug 2021 20:38:37 -0600
Subject: split configuration parsing out into separate packages, split api out
 as well

---
 srv/mailinglist/mailer.go      | 39 ++++++++++++++++++++++++++++++++++++++
 srv/mailinglist/mailinglist.go | 43 ++++++++++++++++++++++++++++++++++--------
 2 files changed, 74 insertions(+), 8 deletions(-)

(limited to 'srv/mailinglist')

diff --git a/srv/mailinglist/mailer.go b/srv/mailinglist/mailer.go
index 12fc398..b65ccb8 100644
--- a/srv/mailinglist/mailer.go
+++ b/srv/mailinglist/mailer.go
@@ -1,8 +1,14 @@
 package mailinglist
 
 import (
+	"context"
+	"errors"
+	"strings"
+
 	"github.com/emersion/go-sasl"
 	"github.com/emersion/go-smtp"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/cfg"
+	"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
 )
 
 // Mailer is used to deliver emails to arbitrary recipients.
@@ -30,6 +36,39 @@ type MailerParams struct {
 	SendAs string
 }
 
+// SetupCfg implement the cfg.Cfger interface.
+func (m *MailerParams) SetupCfg(cfg *cfg.Cfg) {
+
+	cfg.StringVar(&m.SMTPAddr, "ml-smtp-addr", "", "Address of SMTP server to use for sending emails for the mailing list")
+	smtpAuthStr := cfg.String("ml-smtp-auth", "", "user:pass to use when authenticating with the mailing list SMTP server. The given user will also be used as the From address.")
+
+	cfg.OnInit(func(ctx context.Context) error {
+		if m.SMTPAddr == "" {
+			return nil
+		}
+
+		smtpAuthParts := strings.SplitN(*smtpAuthStr, ":", 2)
+		if len(smtpAuthParts) < 2 {
+			return errors.New("invalid -ml-smtp-auth")
+		}
+
+		m.SMTPAuth = sasl.NewPlainClient("", smtpAuthParts[0], smtpAuthParts[1])
+		m.SendAs = smtpAuthParts[0]
+
+		return nil
+	})
+}
+
+// Annotate implements mctx.Annotator interface.
+func (m *MailerParams) Annotate(a mctx.Annotations) {
+	if m.SMTPAddr == "" {
+		return
+	}
+
+	a["smtpAddr"] = m.SMTPAddr
+	a["smtpSendAs"] = m.SendAs
+}
+
 type mailer struct {
 	params MailerParams
 }
diff --git a/srv/mailinglist/mailinglist.go b/srv/mailinglist/mailinglist.go
index 2ebb952..60c1174 100644
--- a/srv/mailinglist/mailinglist.go
+++ b/srv/mailinglist/mailinglist.go
@@ -4,13 +4,17 @@ package mailinglist
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"fmt"
 	"html/template"
 	"io"
+	"net/url"
 	"strings"
 
 	"github.com/google/uuid"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/cfg"
+	"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
 	"github.com/tilinna/clock"
 )
 
@@ -42,13 +46,28 @@ type Params struct {
 	Mailer Mailer
 	Clock  clock.Clock
 
-	// URL of the page which should be navigated to in order to finalize a
-	// subscription.
-	FinalizeSubURL string
+	// PublicURL is the base URL which site visitors can navigate to.
+	// MailingList will generate links based on this value.
+	PublicURL *url.URL
+}
+
+// SetupCfg implement the cfg.Cfger interface.
+func (p *Params) SetupCfg(cfg *cfg.Cfg) {
+	publicURLStr := cfg.String("public-url", "http://localhost:4000", "URL this service is accessible at")
+
+	cfg.OnInit(func(ctx context.Context) error {
+		var err error
+		if p.PublicURL, err = url.Parse(*publicURLStr); err != nil {
+			return fmt.Errorf("parsing -public-url: %w", err)
+		}
+
+		return nil
+	})
+}
 
-	// URL of the page which should be navigated to in order to remove a
-	// subscription.
-	UnsubURL string
+// Annotate implements mctx.Annotator interface.
+func (p *Params) Annotate(a mctx.Annotations) {
+	a["publicURL"] = p.PublicURL
 }
 
 // New initializes and returns a MailingList instance using the given Params.
@@ -105,7 +124,11 @@ func (m *mailingList) BeginSubscription(email string) error {
 	err = beginSubTpl.Execute(body, struct {
 		SubLink string
 	}{
-		SubLink: fmt.Sprintf("%s?subToken=%s", m.params.FinalizeSubURL, emailRecord.SubToken),
+		SubLink: fmt.Sprintf(
+			"%s/mailinglist/finalize.html?subToken=%s",
+			m.params.PublicURL.String(),
+			emailRecord.SubToken,
+		),
 	})
 
 	if err != nil {
@@ -217,7 +240,11 @@ func (m *mailingList) Publish(postTitle, postURL string) error {
 		}{
 			PostTitle: postTitle,
 			PostURL:   postURL,
-			UnsubURL:  fmt.Sprintf("%s?unsubToken=%s", m.params.UnsubURL, emailRecord.UnsubToken),
+			UnsubURL: fmt.Sprintf(
+				"%s/mailinglist/unsubscribe.html?unsubToken=%s",
+				m.params.PublicURL.String(),
+				emailRecord.UnsubToken,
+			),
 		})
 
 		if err != nil {
-- 
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