Implement attachments for article

.gitignore

@@ -1,3 +1,4 @@
 *.db
 .config.toml
 .idea
+.upload

README.md

@@ -9,9 +9,9 @@
 - :heavy_check_mark: Wildmat support
 - :heavy_check_mark: Database (SQLite)
 - :heavy_check_mark: Basic article posting
-- :construction: Article retrieving
+- :heavy_check_mark: Article retrieving
-- :construction: Multipart article support
+- :heavy_check_mark: Multipart article support
-- :x: Transit mode
+- :construction: Transit mode
 - :x: Authentication
 
 #### Commands
@@ -21,8 +21,8 @@
   - :heavy_check_mark: `CAPABILITIES`
   - :heavy_check_mark: `QUIT`
 - :construction: Article posting
-  - :construction: `POST`
+  - :heavy_check_mark: `POST`
-  - :x: `IHAVE`
+  - :construction: `IHAVE`
 - :heavy_check_mark: Article retrieving
   - :heavy_check_mark: `ARTICLE`
   - :heavy_check_mark: `HEAD`

internal/backend/sqlite/migrations/002_attachments.sql

@@ -0,0 +1,11 @@
+-- +goose Up
+
+CREATE TABLE IF NOT EXISTS attachments_articles_mapping (
+    article_id INTEGER REFERENCES articles(id),
+    content_type TEXT NOT NULL,
+    attachment_id TEXT NOT NULL
+);
+
+-- +goose Down
+
+DROP TABLE IF EXISTS attachments_articles_mapping;

internal/backend/sqlite/sqlite.go

@@ -124,6 +124,15 @@ func (sb *SQLiteBackend) SaveArticle(a models.Article, groups []string) error {
 			return err
 		}
 	}
+
+	// save attachments into db
+	for _, v := range a.Attachments {
+		_, err = sb.db.Exec("INSERT INTO attachments_articles_mapping (article_id, content_type, attachment_id) VALUES (?, ?, ?)", articleID, v.ContentType, v.FileName)
+		if err != nil {
+			return err
+		}
+	}
+
 	return err
 }
 
@@ -135,6 +144,9 @@ func (sb *SQLiteBackend) GetArticle(messageID string) (models.Article, error) {
 	if err := sb.db.Get(&a.ArticleNumber, "SELECT article_number FROM articles_to_groups WHERE article_id = ?", a.ID); err != nil {
 		return a, err
 	}
+	if err := sb.db.Select(&a.Attachments, "SELECT content_type, attachment_id FROM attachments_articles_mapping WHERE article_id = ?", a.ID); err != nil {
+		return a, err
+	}
 	return a, json.Unmarshal([]byte(a.HeaderRaw), &a.Header)
 }
 
@@ -144,6 +156,9 @@ func (sb *SQLiteBackend) GetArticleByNumber(g *models.Group, num int) (models.Ar
 		return a, err
 	}
 	a.ArticleNumber = num
+	if err := sb.db.Select(&a.Attachments, "SELECT content_type, attachment_id FROM attachments_articles_mapping WHERE article_id = ?", a.ID); err != nil {
+		return a, err
+	}
 	return a, json.Unmarshal([]byte(a.HeaderRaw), &a.Header)
 }
 

internal/config/config.go

@@ -15,6 +15,7 @@ type Config struct {
 	BackendType string              `toml:"backend_type"`
 	Domain      string              `toml:"domain"`
 	SQLite      SQLiteBackendConfig `toml:"sqlite"`
+	UploadPath  string              `toml:"upload_path"`
 }
 
 type SQLiteBackendConfig struct {

internal/models/article.go

@@ -17,4 +17,10 @@ type Article struct {
 	Header        textproto.MIMEHeader `db:"-"`
 	Envelope      *enmime.Envelope     `db:"-"`
 	ArticleNumber int                  `db:"-"`
+	Attachments   []Attachment
+}
+
+type Attachment struct {
+	ContentType string `db:"content_type"`
+	FileName    string `db:"attachment_id"`
 }

internal/server/handler.go

@@ -12,7 +12,9 @@ import (
 	"github.com/ChronosX88/yans/internal/utils"
 	"github.com/google/uuid"
 	"github.com/jhillyerd/enmime"
+	"io/ioutil"
 	"net/mail"
+	"path"
 	"strconv"
 	"strings"
 	"time"
@@ -22,9 +24,10 @@ type Handler struct {
 	handlers     map[string]func(s *Session, command string, arguments []string, id uint) error
 	backend      backend.StorageBackend
 	serverDomain string
+	uploadPath   string
 }
 
-func NewHandler(b backend.StorageBackend, serverDomain string) *Handler {
+func NewHandler(b backend.StorageBackend, serverDomain, uploadPath string) *Handler {
 	h := &Handler{}
 	h.backend = b
 	h.handlers = map[string]func(s *Session, command string, arguments []string, id uint) error{
@@ -49,6 +52,7 @@ func NewHandler(b backend.StorageBackend, serverDomain string) *Handler {
 		protocol.CommandXover:        h.handleOver,
 	}
 	h.serverDomain = serverDomain
+	h.uploadPath = uploadPath
 	return h
 }
 
@@ -347,13 +351,29 @@ func (h *Handler) handlePost(s *Session, command string, arguments []string, id
 				return err
 			}
 		}
-		if !parentMessage.Thread.Valid {
 		var parentHeader mail.Header
 		err = json.Unmarshal([]byte(parentMessage.HeaderRaw), &parentHeader)
 		parentMessageID := parentHeader.Get("Message-ID")
 		a.Thread = sql.NullString{String: parentMessageID, Valid: true}
-		} else {
+	}
-			a.Thread = parentMessage.Thread
+
+	if len(envelope.Attachments) > 0 {
+		// save attachments
+		for _, v := range envelope.Attachments {
+			if v.ContentType != "image/jpeg" && v.ContentType != "image/png" && v.ContentType != "image/gif" {
+				return s.tconn.PrintfLine(protocol.NNTPResponse{Code: 441, Message: "disallowed attachment type"}.String())
+			}
+			ext_ := strings.Split(v.FileName, ".")
+			ext := ext_[len(ext_)-1]
+			fileName := uuid.New().String() + "." + ext
+			err = ioutil.WriteFile(path.Join(h.uploadPath, fileName), v.Content, 0644)
+			if err != nil {
+				return err
+			}
+			a.Attachments = append(a.Attachments, models.Attachment{
+				ContentType: v.ContentType,
+				FileName:    fileName,
+			})
 		}
 	}
 
@@ -493,7 +513,10 @@ func (h *Handler) handleArticle(s *Session, command string, arguments []string,
 					builder = builder.Header(k, j)
 				}
 			}
-			builder = builder.Text([]byte(a.Body)) // FIXME currently only plain text is supported
+			builder = builder.Text([]byte(a.Body))
+			for _, v := range a.Attachments {
+				builder = builder.AddFileAttachment(path.Join(h.uploadPath, v.FileName))
+			}
 			p, err := builder.Build()
 			if err != nil {
 				return err

internal/server/nntp_server.go

@@ -97,7 +97,7 @@ func (ns *NNTPServer) Start() error {
 
 					id, _ := uuid.NewUUID()
 					closed := make(chan bool)
-					session, err := NewSession(ctx, conn, Capabilities, id.String(), closed, NewHandler(ns.backend, ns.cfg.Domain))
+					session, err := NewSession(ctx, conn, Capabilities, id.String(), closed, NewHandler(ns.backend, ns.cfg.Domain, ns.cfg.UploadPath))
 					ns.sessionPoolMutex.Lock()
 					ns.sessionPool[id.String()] = session
 					ns.sessionPoolMutex.Unlock()