From 6bec0e3964f03f776841cec5e639784222a33958 Mon Sep 17 00:00:00 2001 From: Brian Picciano Date: Sat, 31 Jul 2021 16:45:49 -0600 Subject: [PATCH] begin work on mailing list server, got the fundamental components done --- srv/Makefile | 7 + srv/cmd/mediocre-blog/main.go | 24 ++++ srv/default.nix | 20 +++ srv/go.mod | 14 ++ srv/go.sum | 229 +++++++++++++++++++++++++++++++ srv/mailinglist/mailer.go | 75 +++++++++++ srv/mailinglist/mailinglist.go | 240 +++++++++++++++++++++++++++++++++ srv/mailinglist/store.go | 240 +++++++++++++++++++++++++++++++++ srv/mailinglist/store_test.go | 102 ++++++++++++++ static/.gitignore | 1 - 10 files changed, 951 insertions(+), 1 deletion(-) create mode 100644 srv/Makefile create mode 100644 srv/cmd/mediocre-blog/main.go create mode 100644 srv/default.nix create mode 100644 srv/go.mod create mode 100644 srv/go.sum create mode 100644 srv/mailinglist/mailer.go create mode 100644 srv/mailinglist/mailinglist.go create mode 100644 srv/mailinglist/store.go create mode 100644 srv/mailinglist/store_test.go diff --git a/srv/Makefile b/srv/Makefile new file mode 100644 index 0000000..173bf6a --- /dev/null +++ b/srv/Makefile @@ -0,0 +1,7 @@ +build: + nix-build -A build + +shell: + nix-shell -A shell + + diff --git a/srv/cmd/mediocre-blog/main.go b/srv/cmd/mediocre-blog/main.go new file mode 100644 index 0000000..a1b20be --- /dev/null +++ b/srv/cmd/mediocre-blog/main.go @@ -0,0 +1,24 @@ +package main + +import ( + "flag" + "log" + "net/http" +) + +func main() { + staticDir := flag.String("static-dir", "", "Directory from which static files are served") + //redisAddr := flag.String("redis-addr", "127.0.0.1:6379", "Address which redis is listening on") + listenAddr := flag.String("listen-addr", ":4000", "Address to listen for HTTP requests on") + flag.Parse() + + if *staticDir == "" { + log.Fatal("-static-dir is required") + } + + mux := http.NewServeMux() + mux.Handle("/", http.FileServer(http.Dir(*staticDir))) + + log.Printf("listening on %q", *listenAddr) + log.Fatal(http.ListenAndServe(*listenAddr, mux)) +} diff --git a/srv/default.nix b/srv/default.nix new file mode 100644 index 0000000..5a4a4d0 --- /dev/null +++ b/srv/default.nix @@ -0,0 +1,20 @@ +let + utils = (import ../nix) {}; + pkgs = utils.pkgs; + system = utils.system; +in + { + + build = pkgs.buildGoModule { + pname = "mediocre-blog-srv"; + version = "dev"; + src = ./.; + vendorSha256 = "0xr5gks5mrh34s5npncw71wncrzqrhnm3vjfwdakd7fzd6iw049z"; + }; + + shell = pkgs.stdenv.mkDerivation { + name = "mediocre-blog-srv-shell"; + buildInputs = [ pkgs.go ]; + }; + + } diff --git a/srv/go.mod b/srv/go.mod new file mode 100644 index 0000000..67f424e --- /dev/null +++ b/srv/go.mod @@ -0,0 +1,14 @@ +module blog.mediocregopher.com/srv + +go 1.16 + +require ( + github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21 + github.com/emersion/go-smtp v0.15.0 + github.com/google/uuid v1.3.0 + github.com/mattn/go-sqlite3 v1.14.8 + github.com/rubenv/sql-migrate 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h1:Wo3h+DBQZIxATwftsglhdD/62zRFPhGhTiu5jUJmCaw= +gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo= +gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74= +gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/srv/mailinglist/mailer.go b/srv/mailinglist/mailer.go new file mode 100644 index 0000000..81d0b91 --- /dev/null +++ b/srv/mailinglist/mailer.go @@ -0,0 +1,75 @@ +package mailinglist + +import ( + "github.com/emersion/go-sasl" + "github.com/emersion/go-smtp" +) + +// Mailer is used to deliver emails to arbitrary recipients. +type Mailer interface { + Send(to, subject, body string) error +} + +// MailerParams are used to initialize a new Mailer instance +type MailerParams struct { + SMTPAddr string + + // Optional, if not given then no auth is attempted. + SMTPAuth sasl.Client + + // The sending email address to use for all emails being sent. + SendAs string +} + +type mailer struct { + params MailerParams +} + +// NewMailer initializes and returns a Mailer which will use an external SMTP +// server to deliver email. +func NewMailer(params MailerParams) Mailer { + return &mailer{ + params: params, + } +} + +func (m *mailer) Send(to, subject, body string) error { + + msg := []byte("From: " + m.params.SendAs + "\r\n" + + "To: " + to + "\r\n" + + "Subject: " + subject + "\r\n\r\n" + + body + "\r\n") + + c, err := smtp.Dial(m.params.SMTPAddr) + if err != nil { + return err + } + defer c.Close() + + if err = c.Auth(m.params.SMTPAuth); err != nil { + return err + } + + if err = c.Mail(m.params.SendAs, nil); err != nil { + return err + } + + if err = c.Rcpt(to); err != nil { + return err + } + + w, err := c.Data() + if err != nil { + return err + } + + if _, err = w.Write(msg); err != nil { + return err + } + + if err = w.Close(); err != nil { + return err + } + + return c.Quit() +} diff --git a/srv/mailinglist/mailinglist.go b/srv/mailinglist/mailinglist.go new file mode 100644 index 0000000..03067b2 --- /dev/null +++ b/srv/mailinglist/mailinglist.go @@ -0,0 +1,240 @@ +// Package mailinglist manages the list of subscribed emails and allows emailing +// out to them. +package mailinglist + +import ( + "bytes" + "errors" + "fmt" + "html/template" + "io" + "strings" + + "github.com/google/uuid" + "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 + + // URL of the page which should be navigated to in order to finalize a + // subscription. + FinalizeSubURL string + + // URL of the page which should be navigated to in order to remove a + // subscription. + UnsubURL string +} + +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?subToken=%s", m.params.FinalizeSubURL, 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?unsubToken=%s", m.params.UnsubURL, 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 +} diff --git a/srv/mailinglist/store.go b/srv/mailinglist/store.go new file mode 100644 index 0000000..185e14d --- /dev/null +++ b/srv/mailinglist/store.go @@ -0,0 +1,240 @@ +package mailinglist + +import ( + "crypto/sha512" + "database/sql" + "encoding/base64" + "errors" + "fmt" + "io" + "strings" + "time" + + _ "github.com/mattn/go-sqlite3" + migrate "github.com/rubenv/sql-migrate" +) + +var ( + // ErrNotFound is used to indicate an email could not be found in the + // database. + ErrNotFound = errors.New("no record for given email found") +) + +// EmailIterator will iterate through a sequence of emails, returning the next +// email in the sequence on each call, or returning io.EOF. +type EmailIterator func() (Email, error) + +// Email describes all information related to an email which has yet +// to be verified. +type Email struct { + Email string + SubToken string + CreatedAt time.Time + + UnsubToken string + VerifiedAt time.Time +} + +// Store is used for storing MailingList related information. +type Store interface { + + // Set is used to set the information related to an email. + Set(Email) error + + // Get will return the record for the given email, or ErrNotFound. + Get(email string) (Email, error) + + // GetBySubToken will return the record for the given SubToken, or + // ErrNotFound. + GetBySubToken(subToken string) (Email, error) + + // GetByUnsubToken will return the record for the given UnsubToken, or + // ErrNotFound. + GetByUnsubToken(unsubToken string) (Email, error) + + // Delete will delete the record for the given email. + Delete(email string) error + + // GetAll returns all emails for which there is a record. + GetAll() EmailIterator + + Close() error +} + +var migrations = []*migrate.Migration{ + &migrate.Migration{ + Id: "1", + Up: []string{ + `CREATE TABLE emails ( + id TEXT PRIMARY KEY, + email TEXT NOT NULL, + sub_token TEXT NOT NULL, + created_at INTEGER NOT NULL, + + unsub_token TEXT, + verified_at INTEGER + )`, + }, + Down: []string{"DROP TABLE emails"}, + }, +} + +type store struct { + db *sql.DB +} + +// NewStore initializes a new store using the given SQL DB instance. +func NewStore(dbFile string) (Store, error) { + + db, err := sql.Open("sqlite3", dbFile) + if err != nil { + return nil, fmt.Errorf("opening sqlite file: %w", err) + } + + migrations := &migrate.MemoryMigrationSource{Migrations: migrations} + + if _, err := migrate.Exec(db, "sqlite3", migrations, migrate.Up); err != nil { + return nil, fmt.Errorf("running migrations: %w", err) + } + + return &store{ + db: db, + }, nil +} + +func (s *store) emailID(email string) string { + email = strings.ToLower(email) + h := sha512.New() + h.Write([]byte(email)) + return base64.URLEncoding.EncodeToString(h.Sum(nil)) +} + +func (s *store) Set(email Email) error { + _, err := s.db.Exec( + `INSERT INTO emails ( + id, email, sub_token, created_at, unsub_token, verified_at + ) + VALUES + (?, ?, ?, ?, ?, ?) + ON CONFLICT (id) DO UPDATE SET + email=excluded.email, + sub_token=excluded.sub_token, + unsub_token=excluded.unsub_token, + verified_at=excluded.verified_at + `, + s.emailID(email.Email), + email.Email, + email.SubToken, + email.CreatedAt.Unix(), + email.UnsubToken, + sql.NullInt64{ + Int64: email.VerifiedAt.Unix(), + Valid: !email.VerifiedAt.IsZero(), + }, + ) + + return err +} + +var scanCols = []string{ + "email", "sub_token", "created_at", "unsub_token", "verified_at", +} + +type row interface { + Scan(...interface{}) error +} + +func (s *store) scanRow(row row) (Email, error) { + var email Email + var createdAt int64 + var verifiedAt sql.NullInt64 + + err := row.Scan( + &email.Email, + &email.SubToken, + &createdAt, + &email.UnsubToken, + &verifiedAt, + ) + if err != nil { + return Email{}, err + } + + email.CreatedAt = time.Unix(createdAt, 0) + if verifiedAt.Valid { + email.VerifiedAt = time.Unix(verifiedAt.Int64, 0) + } + + return email, nil +} + +func (s *store) scanSingleRow(row *sql.Row) (Email, error) { + email, err := s.scanRow(row) + if errors.Is(err, sql.ErrNoRows) { + return Email{}, ErrNotFound + } + + return email, err +} + +func (s *store) Get(email string) (Email, error) { + row := s.db.QueryRow( + `SELECT `+strings.Join(scanCols, ",")+` + FROM emails + WHERE id=?`, + s.emailID(email), + ) + + return s.scanSingleRow(row) +} + +func (s *store) GetBySubToken(subToken string) (Email, error) { + row := s.db.QueryRow( + `SELECT `+strings.Join(scanCols, ",")+` + FROM emails + WHERE sub_token=?`, + subToken, + ) + + return s.scanSingleRow(row) +} + +func (s *store) GetByUnsubToken(unsubToken string) (Email, error) { + row := s.db.QueryRow( + `SELECT `+strings.Join(scanCols, ",")+` + FROM emails + WHERE unsub_token=?`, + unsubToken, + ) + + return s.scanSingleRow(row) +} + +func (s *store) Delete(email string) error { + _, err := s.db.Exec( + `DELETE FROM emails WHERE id=?`, + s.emailID(email), + ) + return err +} + +func (s *store) GetAll() EmailIterator { + rows, err := s.db.Query( + `SELECT ` + strings.Join(scanCols, ",") + ` + FROM emails`, + ) + + return func() (Email, error) { + if err != nil { + return Email{}, err + + } else if !rows.Next() { + return Email{}, io.EOF + } + return s.scanRow(rows) + } +} + +func (s *store) Close() error { + return s.db.Close() +} diff --git a/srv/mailinglist/store_test.go b/srv/mailinglist/store_test.go new file mode 100644 index 0000000..25eb150 --- /dev/null +++ b/srv/mailinglist/store_test.go @@ -0,0 +1,102 @@ +package mailinglist + +import ( + "io" + "io/ioutil" + "os" + "testing" + "time" + + "github.com/stretchr/testify/assert" +) + +func TestStore(t *testing.T) { + tmpFile, err := ioutil.TempFile(os.TempDir(), "mediocre-blog-mailinglist-store-test-") + if err != nil { + t.Fatal("Cannot create temporary file", err) + } + tmpFilePath := tmpFile.Name() + tmpFile.Close() + + t.Logf("using temporary sqlite file at %q", tmpFilePath) + + t.Cleanup(func() { + if err := os.Remove(tmpFilePath); err != nil { + panic(err) + } + }) + + store, err := NewStore(tmpFilePath) + assert.NoError(t, err) + + t.Cleanup(func() { + assert.NoError(t, store.Close()) + }) + + now := func() time.Time { + return time.Now().Truncate(time.Second) + } + + assertGet := func(t *testing.T, email Email) { + t.Helper() + + gotEmail, err := store.Get(email.Email) + assert.NoError(t, err) + assert.Equal(t, email, gotEmail) + + gotEmail, err = store.GetBySubToken(email.SubToken) + assert.NoError(t, err) + assert.Equal(t, email, gotEmail) + + if email.UnsubToken != "" { + gotEmail, err = store.GetByUnsubToken(email.UnsubToken) + assert.NoError(t, err) + assert.Equal(t, email, gotEmail) + } + } + + assertNotFound := func(t *testing.T, email string) { + t.Helper() + _, err := store.Get(email) + assert.ErrorIs(t, err, ErrNotFound) + } + + // now start actual tests + + // GetAll should not do anything, there's no data + _, err = store.GetAll()() + assert.ErrorIs(t, err, io.EOF) + + emailFoo := Email{ + Email: "foo", + SubToken: "subTokenFoo", + CreatedAt: now(), + } + + // email isn't stored yet, shouldn't exist + assertNotFound(t, emailFoo.Email) + + // Set an email, now it should exist + assert.NoError(t, store.Set(emailFoo)) + assertGet(t, emailFoo) + + // Update the email with an unsub token + emailFoo.UnsubToken = "unsubTokenFoo" + emailFoo.VerifiedAt = now() + assert.NoError(t, store.Set(emailFoo)) + assertGet(t, emailFoo) + + // GetAll should now only return that email + iter := store.GetAll() + gotEmail, err := iter() + assert.NoError(t, err) + assert.Equal(t, emailFoo, gotEmail) + _, err = iter() + assert.ErrorIs(t, err, io.EOF) + + // Delete the email, it should be gone + assert.NoError(t, store.Delete(emailFoo.Email)) + assertNotFound(t, emailFoo.Email) + _, err = store.GetAll()() + assert.ErrorIs(t, err, io.EOF) +} diff --git a/static/.gitignore b/static/.gitignore index 669651c..1937e95 100644 --- a/static/.gitignore +++ b/static/.gitignore @@ -3,4 +3,3 @@ *.gem .jekyll-metadata _site -result