feat: implement local-unix clients

3 files changed, 137 insertions, 1 deletions

diff --git a/internal/client/output/b2.go b/internal/client/output/b2.go
index 6979e5b..e741e25 100644
--- a/internal/client/output/b2.go
+++ b/internal/client/output/b2.go
@@ -19,7 +19,7 @@ type B2OutputClient struct {
 	b2cl   *b2.Client
 }
 
-func NewB2OutputClient(cfg *config.OutputConfig) (*B2OutputClient, error) {
+func NewB2OutputClient(cfg *config.OutputConfig) (OutputClient, error) {
 	if cfg.Storage.Type != "b2" {
 		return nil, fmt.Errorf("invalid storage type for B2OutputClient")
 	}
diff --git a/internal/client/output/local_unix.go b/internal/client/output/local_unix.go
new file mode 100644
index 0000000..798be3b
--- /dev/null
+++ b/internal/client/output/local_unix.go
@@ -0,0 +1,130 @@
+package output
+
+import (
+	"fmt"
+	"io"
+	"mime"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/SayaAndy/saya-today-thumbnail-generator/config"
+	"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
+	"golang.org/x/sys/unix"
+)
+
+var _ OutputClient = (*LocalUnixOutputClient)(nil)
+
+type LocalUnixOutputClient struct {
+	path     string
+	fileMode uint32
+	dirMode  uint32
+	attrMode string
+}
+
+func NewLocalUnixOutputClient(cfg *config.OutputConfig) (OutputClient, error) {
+	if cfg.Storage.Type != "local-unix" {
+		return nil, fmt.Errorf("invalid storage type for LocalUnixOutputClient")
+	}
+	localCfg := cfg.Storage.Config.(*config.OutputLocalUnixConfig)
+
+	fpm, err := strconv.ParseInt(localCfg.FilePermissionMode, 8, 32)
+	if err != nil {
+		return nil, fmt.Errorf("fail to parse file permission mode as an octal number: %w", err)
+	}
+
+	dpm, err := strconv.ParseInt(localCfg.DirPermissionMode, 8, 32)
+	if err != nil {
+		return nil, fmt.Errorf("fail to parse directory permission mode as an octal number: %w", err)
+	}
+
+	return &LocalUnixOutputClient{localCfg.Path, uint32(fpm), uint32(dpm), localCfg.AttributesImplementation}, nil
+}
+
+func (c *LocalUnixOutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct) (io.WriteCloser, error) {
+	pathSegments := strings.Split(path, "/")
+	dirpath := strings.Join(pathSegments[0:len(pathSegments)-1], "/")
+	if err := os.MkdirAll(c.path+dirpath, os.FileMode(c.dirMode)); err != nil {
+		return nil, fmt.Errorf("fail to mkdir parent directories for a path: %w", err)
+	}
+
+	var err error
+	if _, err = os.Stat(c.path + path); err != nil && !os.IsNotExist(err) {
+		return nil, fmt.Errorf("fail to stat a file, although file exists: %w", err)
+	}
+	if os.IsNotExist(err) {
+		f, err := os.OpenFile(c.path+path, os.O_WRONLY|os.O_CREATE, os.FileMode(c.fileMode))
+		if err != nil {
+			return nil, fmt.Errorf("fail to create a file: %w", err)
+		}
+		f.Close()
+	}
+
+	switch c.attrMode {
+	case "xattr":
+		if err := unix.Setxattr(c.path+path, "user.originalfile.mddate", []byte(strconv.FormatInt(inputMetadata.LastModified.Unix(), 16)), 0); err != nil {
+			return nil, fmt.Errorf("fail to write user.originalfile.mddate xattribute: %w", err)
+		}
+	case "none":
+	default:
+		return nil, fmt.Errorf("unknown attributes implementation: %s", c.attrMode)
+	}
+
+	return os.OpenFile(c.path+path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(c.fileMode))
+}
+
+func (c *LocalUnixOutputClient) ReadMetadata(path string) (*MetadataStruct, error) {
+	nodePathParts := strings.Split(path, "/")
+	nodeName := nodePathParts[len(nodePathParts)-1]
+	nodeNameParts := strings.Split(nodeName, ".")
+	nodeExt := ""
+	if len(nodeNameParts) >= 2 {
+		nodeExt = nodeNameParts[len(nodeNameParts)-1]
+	}
+
+	fileInfo, err := os.Stat(c.path + path)
+	if err != nil {
+		return nil, fmt.Errorf("fail to read file info: %w", err)
+	}
+
+	stat_t := fileInfo.Sys().(*syscall.Stat_t)
+	creationTime := time.Unix(stat_t.Ctim.Sec, stat_t.Ctim.Nsec)
+
+	misc := map[string]string{
+		"Size": strconv.FormatInt(fileInfo.Size(), 10),
+	}
+
+	mddateOriginal := make([]byte, 0)
+	switch c.attrMode {
+	case "xattr":
+		sz, err := unix.Getxattr(c.path+path, "user.originalfile.mddate", nil)
+		if err != nil {
+			return nil, fmt.Errorf("fail to get size of user.originalfile.mddate attribute: %w", err)
+		}
+		mddateOriginal = make([]byte, sz)
+		if _, err = unix.Getxattr(c.path+path, "user.originalfile.mddate", mddateOriginal); err != nil {
+			return nil, fmt.Errorf("fail to get user.originalfile.mddate attribute: %w", err)
+		}
+	case "none":
+	default:
+		return nil, fmt.Errorf("unknown attributes implementation: %s", c.attrMode)
+	}
+
+	return &MetadataStruct{
+		Name:         fileInfo.Name(),
+		StorageType:  "local-unix",
+		Hash:         strconv.FormatInt(fileInfo.ModTime().Unix(), 16),
+		HashOriginal: string(mddateOriginal),
+		ContentType:  mime.TypeByExtension("." + nodeExt),
+		FirstCreated: creationTime,
+		LastModified: fileInfo.ModTime(),
+		Misc:         misc,
+	}, nil
+}
+
+func (c *LocalUnixOutputClient) IsMissing(path string) bool {
+	_, err := os.Stat(c.path + path)
+	return err != nil
+}
diff --git a/internal/client/output/output_client_interface.go b/internal/client/output/output_client_interface.go
index 4ec4728..437895c 100644
--- a/internal/client/output/output_client_interface.go
+++ b/internal/client/output/output_client_interface.go
@@ -4,6 +4,7 @@ import (
 	"io"
 	"time"
 
+	"github.com/SayaAndy/saya-today-thumbnail-generator/config"
 	"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
 )
 
@@ -23,3 +24,8 @@ type MetadataStruct struct {
 	LastModified time.Time
 	Misc         map[string]string
 }
+
+var NewOutputClientMap = map[string]func(cfg *config.OutputConfig) (OutputClient, error){
+	"b2":         NewB2OutputClient,
+	"local-unix": NewLocalUnixOutputClient,
+}