api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/owner_new.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"golang.org/x/crypto/bcrypt"
+	"net/http"
+	"time"
+)
+
+func ownerNew(email string, name string, password string) (string, error) {
+	if email == "" || name == "" || password == "" {
+		return "", errorMissingField
+	}
+
+	ownerHex, err := randomHex(32)
+	if err != nil {
+		logger.Errorf("cannot generate ownerHex: %v", err)
+		return "", errorInternal
+	}
+
+	passwordHash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		logger.Errorf("cannot generate hash from password: %v\n", err)
+		return "", errorInternal
+	}
+
+	statement := `
+		INSERT INTO
+		owners (ownerHex, email, name, passwordHash, joinDate, confirmedEmail)
+		VALUES ($1,       $2,    $3,   $4,           $5,       $6            );
+	`
+	_, err = db.Exec(statement, ownerHex, email, name, string(passwordHash), time.Now().UTC(), !smtpConfigured)
+	if err != nil {
+		// TODO: Make sure `err` is actually about conflicting UNIQUE, and not some
+		// other error. If it is something else, we should probably return `errorInternal`.
+		return "", errorEmailAlreadyExists
+	}
+
+	if smtpConfigured {
+		confirmHex, err := randomHex(32)
+		if err != nil {
+			logger.Errorf("cannot generate confirmHex: %v", err)
+			return "", errorInternal
+		}
+
+		statement = `
+      INSERT INTO
+      ownerConfirmHexes (confirmHex, ownerHex, sendDate)
+      VALUES            ($1,         $2,       $3      );
+    `
+		_, err = db.Exec(statement, confirmHex, ownerHex, time.Now().UTC())
+		if err != nil {
+			logger.Errorf("cannot insert confirmHex: %v\n", err)
+			return "", errorInternal
+		}
+
+		if err = smtpOwnerConfirmHex(email, name, confirmHex); err != nil {
+			return "", err
+		}
+	}
+
+	return ownerHex, nil
+}
+
+func ownerNewHandler(w http.ResponseWriter, r *http.Request) {
+	type request struct {
+		Email    *string `json:"email"`
+		Name     *string `json:"name"`
+		Password *string `json:"password"`
+	}
+
+	var x request
+	if err := unmarshalBody(r, &x); err != nil {
+		writeBody(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	if _, err := ownerNew(*x.Email, *x.Name, *x.Password); err != nil {
+		writeBody(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	writeBody(w, response{"success": true})
+}