Onboarding, Sent box and Outbox (#45)

* main

- Set

* Working

* Welcome

- Added welcome message generation

* Smtpsender

- On successful SMTP send create the "Sent" box and then
try move from "Outbox" to "Sent"

* Sent box

- Create the mailbox in `main.go` and not every time we try move from `Outbox` to `Sent`

* Use logegr

* USer

- Added logger pointer (and made use of it)
- Disallow renaming or deletion of 'Sent'

* When creating a new user set it up with logger

* Encoded message

* Added tests

* Send a welcome mail on startup (soon to mke it only happen once)

* try set flags

* Onboarding flag set

* Sender
- Removed testing code

* Welcome

- Moved welcomer code

* Cleaned up

* Added more

* renamed package

* Removed comment

* welcome

- FIxed variable names

* welcome

- Removed semi-colons
- Fixed imports

* welcome

- Ran `gofmt`

* welcome test

- Fixed up

* h

* main

- Ran `gofmt`

* Main

- Fxied

* Welcome

- Foxed name

* Added `.gitignore`

* Mailbox

- Disabled print logging

* Fixed

* fixedg

* fixe and use `%v`

internal/welcome/welcome.go

@@ -0,0 +1,109 @@
+package welcome
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/emersion/go-message"
+	"github.com/neilalexander/yggmail/internal/storage"
+	"log"
+)
+
+const (
+	WEBSITE_URL = "https://github.com/neilalexander/yggmail"
+	CODE_URL    = "https://github.com/neilalexander/yggmail"
+)
+
+func Onboard(user string, storage storage.Storage, log *log.Logger) {
+	// Fetch onboarding status
+	if f, e := storage.ConfigGet("onboarding_done"); e == nil {
+
+		// If we haven't onboarded yet
+		if len(f) == 0 {
+			log.Printf("Performing onboarding...\n")
+
+			// takes in addr and output writer
+			welcomeMsg, e := welcomeMessageFor(user)
+			if e != nil {
+				log.Println("Failure to generate welcome message")
+			}
+			var welcomeId int
+			if id, e := storage.MailCreate("INBOX", welcomeMsg); e != nil {
+				log.Printf("Failed to store welcome message: %v\n", e)
+				panic("See above")
+			} else {
+				welcomeId = id
+			}
+
+			if storage.MailUpdateFlags("INBOX", welcomeId, false, false, false, false) != nil {
+				panic("Could not set flags on onboarding message")
+			}
+
+			// set flag to never do it again
+			if storage.ConfigSet("onboarding_done", "true") != nil {
+				panic("Error storing onboarding flag")
+			}
+
+			log.Printf("Onboarding done\n")
+		} else {
+			log.Printf("Onboarding not required\n")
+		}
+	} else {
+		panic("Error fetching onboarding status")
+	}
+
+}
+
+func welcomeMessageFor(yourYggMailAddr string) ([]byte, error) {
+	var hdr = welcomeTo(yourYggMailAddr)
+
+	var buff = bytes.NewBuffer([]byte{})
+
+	// writer writes to underlying writer (our buffer)
+	// but returns a writer just for the body part
+	// (it will encode header to underlying writer
+	// first)
+	msgWrt, e := message.CreateWriter(buff, hdr)
+	if e != nil {
+		return nil, e
+	}
+
+	var formattedBody = fmt.Sprintf(welcomeBody, yourYggMailAddr, WEBSITE_URL, CODE_URL)
+
+	if _, e := msgWrt.Write([]byte(formattedBody)); e != nil {
+		return nil, e
+	}
+	// var ent, e = message.New(hdr, body_rdr)
+
+	return buff.Bytes(), nil
+}
+
+var welcomeSubject = "Welcome to Yggmail!"
+var welcomeBody = `
+Hey <b>%s</b>!
+
+We'd like to welcome you to Yggmail!
+
+You're about to embark in both a revolution and an
+evolution as you know it. The revolution is that this
+mailing system uses the new and experimental Yggdrasil
+internet routing system, the evolution is that it's
+good old email as you know it.
+
+Want to learn more? See the <a href="%s">website</a>
+
+Thinking of contributing; we'd be more than happy
+to work together. Our project is hosted on <a href="%s">GitHub</a>.
+`
+
+func welcomeTo(yourYggMailAddr string) message.Header {
+	// header would be a nice preview of what to expect
+	// of the message
+	var welcomeHdr = message.Header{}
+	welcomeHdr.Add("From", "Yggmail Team")
+	welcomeHdr.Add("To", yourYggMailAddr+"@yggmail")
+	welcomeHdr.Add("Subject", welcomeSubject)
+	// FIXME: Add content-type entry here
+
+	fmt.Printf("Generated welcome mesg '%v'\n", welcomeHdr)
+	return welcomeHdr
+}