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authorBrian Picciano <mediocregopher@gmail.com>2022-05-05 21:20:22 -0600
committerBrian Picciano <mediocregopher@gmail.com>2022-05-05 21:20:22 -0600
commiteed10ce514f28e4acf772f76c92ca05eebec105f (patch)
treed76820d7a3cd23f09f7dd0e6065bb0cef7ba16dc /srv/mailinglist/mailinglist.go
parentcc8b6289ac3f7d1abb648217949beb89827d7374 (diff)
Fix various problems with the srv build
Diffstat (limited to 'srv/mailinglist/mailinglist.go')
-rw-r--r--srv/mailinglist/mailinglist.go272
1 files changed, 0 insertions, 272 deletions
diff --git a/srv/mailinglist/mailinglist.go b/srv/mailinglist/mailinglist.go
deleted file mode 100644
index fc6e014..0000000
--- a/srv/mailinglist/mailinglist.go
+++ /dev/null
@@ -1,272 +0,0 @@
-// Package mailinglist manages the list of subscribed emails and allows emailing
-// out to them.
-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"
-)
-
-var (
- // ErrAlreadyVerified is used when the email is already fully subscribed.
- ErrAlreadyVerified = errors.New("email is already subscribed")
-)
-
-// MailingList is able to subscribe, unsubscribe, and iterate through emails.
-type MailingList interface {
-
- // May return ErrAlreadyVerified.
- BeginSubscription(email string) error
-
- // May return ErrNotFound or ErrAlreadyVerified.
- FinalizeSubscription(subToken string) error
-
- // May return ErrNotFound.
- Unsubscribe(unsubToken string) error
-
- // Publish blasts the mailing list with an update about a new blog post.
- Publish(postTitle, postURL string) error
-}
-
-// Params are parameters used to initialize a new MailingList. All fields are
-// required unless otherwise noted.
-type Params struct {
- Store Store
- Mailer Mailer
- Clock clock.Clock
-
- // 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("ml-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
- })
-}
-
-// 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.
-func New(params Params) MailingList {
- return &mailingList{params: params}
-}
-
-type mailingList struct {
- params Params
-}
-
-var beginSubTpl = template.Must(template.New("beginSub").Parse(`
-Welcome to the Mediocre Blog mailing list! By subscribing to this mailing list
-you are signing up to receive an email everytime a new blog post is published.
-
-In order to complete your subscription please navigate to the following link:
-
-{{ .SubLink }}
-
-This mailing list is built and run using my own hardware and software, and I
-solemnly swear that you'll never receive an email from it unless there's a new
-blog post.
-
-If you did not initiate this email, and/or do not wish to subscribe to the
-mailing list, then simply delete this email and pretend that nothing ever
-happened.
-
-- Brian
-`))
-
-func (m *mailingList) BeginSubscription(email string) error {
-
- emailRecord, err := m.params.Store.Get(email)
-
- if errors.Is(err, ErrNotFound) {
- emailRecord = Email{
- Email: email,
- SubToken: uuid.New().String(),
- CreatedAt: m.params.Clock.Now(),
- }
-
- if err := m.params.Store.Set(emailRecord); err != nil {
- return fmt.Errorf("storing pending email: %w", err)
- }
-
- } else if err != nil {
- return fmt.Errorf("finding existing email record: %w", err)
-
- } else if !emailRecord.VerifiedAt.IsZero() {
- return ErrAlreadyVerified
- }
-
- body := new(bytes.Buffer)
- err = beginSubTpl.Execute(body, struct {
- SubLink string
- }{
- SubLink: fmt.Sprintf(
- "%s/mailinglist/finalize.html?subToken=%s",
- m.params.PublicURL.String(),
- emailRecord.SubToken,
- ),
- })
-
- if err != nil {
- return fmt.Errorf("executing beginSubTpl: %w", err)
- }
-
- err = m.params.Mailer.Send(
- email,
- "Mediocre Blog - Please verify your email address",
- body.String(),
- )
-
- if err != nil {
- return fmt.Errorf("sending email: %w", err)
- }
-
- return nil
-}
-
-func (m *mailingList) FinalizeSubscription(subToken string) error {
- emailRecord, err := m.params.Store.GetBySubToken(subToken)
-
- if err != nil {
- return fmt.Errorf("retrieving email record: %w", err)
-
- } else if !emailRecord.VerifiedAt.IsZero() {
- return ErrAlreadyVerified
- }
-
- emailRecord.VerifiedAt = m.params.Clock.Now()
- emailRecord.UnsubToken = uuid.New().String()
-
- if err := m.params.Store.Set(emailRecord); err != nil {
- return fmt.Errorf("storing verified email: %w", err)
- }
-
- return nil
-}
-
-func (m *mailingList) Unsubscribe(unsubToken string) error {
- emailRecord, err := m.params.Store.GetByUnsubToken(unsubToken)
-
- if err != nil {
- return fmt.Errorf("retrieving email record: %w", err)
- }
-
- if err := m.params.Store.Delete(emailRecord.Email); err != nil {
- return fmt.Errorf("deleting email record: %w", err)
- }
-
- return nil
-}
-
-var publishTpl = template.Must(template.New("publish").Parse(`
-A new post has been published to the Mediocre Blog!
-
-{{ .PostTitle }}
-{{ .PostURL }}
-
-If you're interested then please check it out!
-
-If you'd like to unsubscribe from this mailing list then visit the following
-link instead:
-
-{{ .UnsubURL }}
-
-- Brian
-`))
-
-type multiErr []error
-
-func (m multiErr) Error() string {
- if len(m) == 0 {
- panic("multiErr with no members")
- }
-
- b := new(strings.Builder)
- fmt.Fprintln(b, "The following errors were encountered:")
- for _, err := range m {
- fmt.Fprintf(b, "\t- %s\n", err.Error())
- }
-
- return b.String()
-}
-
-func (m *mailingList) Publish(postTitle, postURL string) error {
-
- var mErr multiErr
-
- iter := m.params.Store.GetAll()
- for {
- emailRecord, err := iter()
- if errors.Is(err, io.EOF) {
- break
-
- } else if err != nil {
- mErr = append(mErr, fmt.Errorf("iterating through email records: %w", err))
- break
-
- } else if emailRecord.VerifiedAt.IsZero() {
- continue
- }
-
- body := new(bytes.Buffer)
- err = publishTpl.Execute(body, struct {
- PostTitle string
- PostURL string
- UnsubURL string
- }{
- PostTitle: postTitle,
- PostURL: postURL,
- UnsubURL: fmt.Sprintf(
- "%s/mailinglist/unsubscribe.html?unsubToken=%s",
- m.params.PublicURL.String(),
- emailRecord.UnsubToken,
- ),
- })
-
- if err != nil {
- mErr = append(mErr, fmt.Errorf("rendering publish email template for %q: %w", emailRecord.Email, err))
- continue
- }
-
- err = m.params.Mailer.Send(
- emailRecord.Email,
- fmt.Sprintf("Mediocre Blog - New Post! - %s", postTitle),
- body.String(),
- )
-
- if err != nil {
- mErr = append(mErr, fmt.Errorf("sending email to %q: %w", emailRecord.Email, err))
- continue
- }
- }
-
- if len(mErr) > 0 {
- return mErr
- }
-
- return nil
-}