feat: add jpeg converter

fix: explicitly set content type for b2
feat: extend rewrite settings with "never overwrite"
feat: move rewrite setting to converter config
feat: allow to skip size config

6 files changed, 144 insertions, 14 deletions

diff --git a/internal/client/output/b2.go b/internal/client/output/b2.go
index f53532a..0616368 100644
--- a/internal/client/output/b2.go
+++ b/internal/client/output/b2.go
@@ -2,8 +2,10 @@ package output
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"io"
+	"log/slog"
 
 	"github.com/Backblaze/blazer/b2"
 	"github.com/SayaAndy/saya-today-thumbnail-generator/config"
@@ -37,7 +39,7 @@ func NewB2OutputClient(cfg *config.OutputConfig) (OutputClient, error) {
 	return &B2OutputClient{b2cl: b2cl, bucket: bucket, prefix: b2cfg.Prefix}, nil
 }
 
-func (c *B2OutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct) (io.WriteCloser, error) {
+func (c *B2OutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct, outputContentType string) (io.WriteCloser, error) {
 	obj := c.bucket.Object(c.prefix + path)
 	if obj == nil {
 		return nil, fmt.Errorf("failed to reference object in B2 bucket")
@@ -45,6 +47,7 @@ func (c *B2OutputClient) GetWriter(path string, inputMetadata *input.MetadataStr
 
 	attrs := &b2.Attrs{Info: make(map[string]string)}
 	attrs.Info["sha1-original"] = inputMetadata.Hash
+	attrs.ContentType = outputContentType
 
 	return obj.NewWriter(context.Background(), b2.WithAttrsOption(attrs)), nil
 }
@@ -99,5 +102,12 @@ func (c *B2OutputClient) IsMissing(path string) bool {
 		return true
 	}
 
+	attrsJson, _ := json.Marshal(attrs)
+	slog.Debug("got object attrs", slog.String("path", path), slog.String("attrs", string(attrsJson)))
+
+	if attrs.Size == 0 {
+		return true
+	}
+
 	return attrs.Status == b2.Hider
 }
diff --git a/internal/client/output/local_unix.go b/internal/client/output/local_unix.go
index 668a14b..6f9a7b3 100644
--- a/internal/client/output/local_unix.go
+++ b/internal/client/output/local_unix.go
@@ -44,7 +44,7 @@ func NewLocalUnixOutputClient(cfg *config.OutputConfig) (OutputClient, error) {
 	return &LocalUnixOutputClient{localCfg.Path, uint32(fpm), uint32(dpm), localCfg.AttributesImplementation}, nil
 }
 
-func (c *LocalUnixOutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct) (io.WriteCloser, error) {
+func (c *LocalUnixOutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct, _ string) (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 {
diff --git a/internal/client/output/output_client_interface.go b/internal/client/output/output_client_interface.go
index c74851d..f9e421b 100644
--- a/internal/client/output/output_client_interface.go
+++ b/internal/client/output/output_client_interface.go
@@ -9,7 +9,7 @@ import (
 )
 
 type OutputClient interface {
-	GetWriter(path string, inputMetadata *input.MetadataStruct) (io.WriteCloser, error)
+	GetWriter(path string, inputMetadata *input.MetadataStruct, outputContentType string) (io.WriteCloser, error)
 	ReadMetadata(path string) (*MetadataStruct, error)
 	IsMissing(path string) bool
 }
diff --git a/internal/converter/converter_interface.go b/internal/converter/converter_interface.go
index fda23d1..abff99d 100644
--- a/internal/converter/converter_interface.go
+++ b/internal/converter/converter_interface.go
@@ -17,4 +17,5 @@ type Converter interface {
 
 var NewConverterMap = map[string]func(cfg *config.ConverterConfig) (Converter, error){
 	"webp": NewWebpConverter,
+	"jpeg": NewJpegConverter,
 }
diff --git a/internal/converter/jpeg.go b/internal/converter/jpeg.go
new file mode 100644
index 0000000..a35a47c
--- /dev/null
+++ b/internal/converter/jpeg.go
@@ -0,0 +1,114 @@
+package converter
+
+import (
+	"fmt"
+	"image"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"log/slog"
+	"path/filepath"
+	"strings"
+
+	"github.com/SayaAndy/saya-today-thumbnail-generator/config"
+	"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
+	"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/output"
+	"github.com/kolesa-team/go-webp/webp"
+	"golang.org/x/image/draw"
+)
+
+var _ Converter = (*JpegConverter)(nil)
+
+type JpegConverter struct {
+	maxWidth      int
+	maxHeight     int
+	extensionName string
+	quality       int
+	outputClient  output.OutputClient
+}
+
+func NewJpegConverter(cfg *config.ConverterConfig) (Converter, error) {
+	if cfg.Type != "jpeg" {
+		return nil, fmt.Errorf("invalid storage type for JpegConverter")
+	}
+	jpegCfg := cfg.Config.(*config.JpegConfig)
+
+	outputClient, err := output.NewOutputClientMap[cfg.Output.Storage.Type](&cfg.Output)
+	if err != nil {
+		return nil, fmt.Errorf("fail to initialize output client: %w", err)
+	}
+
+	extensionName := ".jpg"
+	if jpegCfg.ExtensionName != "" {
+		extensionName = "." + jpegCfg.ExtensionName
+	}
+
+	return &JpegConverter{jpegCfg.Size.MaxWidth, jpegCfg.Size.MaxHeight, extensionName, jpegCfg.Quality, outputClient}, nil
+}
+
+func (p *JpegConverter) Process(inputMetadata *input.MetadataStruct, reader io.Reader, outputName string) error {
+	var src image.Image
+
+	writer, err := p.outputClient.GetWriter(outputName, inputMetadata, "image/jpeg")
+	if err != nil {
+		return fmt.Errorf("fail to initialize writer for output: %w", err)
+	}
+	defer writer.Close()
+
+	switch inputMetadata.ContentType {
+	case "image/jpeg":
+		src, err = jpeg.Decode(reader)
+		if err != nil {
+			return fmt.Errorf("decode jpeg: %w", err)
+		}
+	case "image/png":
+		src, err = png.Decode(reader)
+		if err != nil {
+			return fmt.Errorf("decode png: %w", err)
+		}
+	case "image/webp":
+		src, err = webp.Decode(reader, nil)
+		if err != nil {
+			return fmt.Errorf("decode webp: %w", err)
+		}
+	default:
+		return fmt.Errorf("unsupported content type: %s", inputMetadata.ContentType)
+	}
+
+	xCoef := 1.0
+	if p.maxWidth > 0 {
+		xCoef = float64(p.maxWidth) / float64(src.Bounds().Max.X)
+	}
+	yCoef := 1.0
+	if p.maxHeight > 0 {
+		yCoef = float64(p.maxHeight) / float64(src.Bounds().Max.Y)
+	}
+	slog.Debug("calculated coefficients", slog.Float64("x_coef", xCoef), slog.Float64("y_coef", yCoef))
+
+	minCoef := xCoef
+	if yCoef < minCoef {
+		minCoef = yCoef
+	}
+
+	if minCoef >= 1.0 {
+		return jpeg.Encode(writer, src, &jpeg.Options{Quality: p.quality})
+	}
+
+	dst := image.NewRGBA(image.Rect(0, 0, int(float64(src.Bounds().Max.X)*minCoef+0.5), int(float64(src.Bounds().Max.Y)*minCoef+0.5)))
+	draw.CatmullRom.Scale(dst, dst.Rect, src, src.Bounds(), draw.Over, nil)
+
+	return jpeg.Encode(writer, dst, &jpeg.Options{Quality: p.quality})
+}
+
+func (p *JpegConverter) DeductOutputPath(inputPath string) string {
+	withoutExt, _ := strings.CutSuffix(inputPath, filepath.Ext(inputPath))
+	return withoutExt + p.extensionName
+}
+
+func (p *JpegConverter) ReadMetadata(path string) (*output.MetadataStruct, error) {
+	return p.outputClient.ReadMetadata(path)
+}
+
+func (p *JpegConverter) IsMissing(path string) bool {
+	return p.outputClient.IsMissing(path)
+}
diff --git a/internal/converter/webp.go b/internal/converter/webp.go
index 8cfe5a7..fbffd01 100644
--- a/internal/converter/webp.go
+++ b/internal/converter/webp.go
@@ -44,7 +44,7 @@ func NewWebpConverter(cfg *config.ConverterConfig) (Converter, error) {
 func (p *WebpConverter) Process(inputMetadata *input.MetadataStruct, reader io.Reader, outputName string) error {
 	var src image.Image
 
-	writer, err := p.outputClient.GetWriter(outputName, inputMetadata)
+	writer, err := p.outputClient.GetWriter(outputName, inputMetadata, "image/webp")
 	if err != nil {
 		return fmt.Errorf("fail to initialize writer for output: %w", err)
 	}
@@ -61,6 +61,11 @@ func (p *WebpConverter) Process(inputMetadata *input.MetadataStruct, reader io.R
 		if err != nil {
 			return fmt.Errorf("decode png: %w", err)
 		}
+	case "image/webp":
+		src, err = webp.Decode(reader, nil)
+		if err != nil {
+			return fmt.Errorf("decode webp: %w", err)
+		}
 	default:
 		return fmt.Errorf("unsupported content type: %s", inputMetadata.ContentType)
 	}
@@ -70,25 +75,25 @@ func (p *WebpConverter) Process(inputMetadata *input.MetadataStruct, reader io.R
 		return fmt.Errorf("create webp encoder options: %w", err)
 	}
 
-	xCoef := float64(p.maxWidth) / float64(src.Bounds().Max.X)
-	if p.maxWidth == 0 {
-		xCoef = 1
+	xCoef := 1.0
+	if p.maxWidth > 0 {
+		xCoef = float64(p.maxWidth) / float64(src.Bounds().Max.X)
 	}
-	yCoef := float64(p.maxHeight) / float64(src.Bounds().Max.Y)
-	if p.maxHeight == 0 {
-		yCoef = 1
+	yCoef := 1.0
+	if p.maxHeight > 0 {
+		yCoef = float64(p.maxHeight) / float64(src.Bounds().Max.Y)
 	}
 	slog.Debug("calculated coefficients", slog.Float64("x_coef", xCoef), slog.Float64("y_coef", yCoef))
 
-	if xCoef > 1 && yCoef > 1 {
-		return webp.Encode(writer, src, opts)
-	}
-
 	minCoef := xCoef
 	if yCoef < minCoef {
 		minCoef = yCoef
 	}
 
+	if minCoef >= 1.0 {
+		return webp.Encode(writer, src, opts)
+	}
+
 	dst := image.NewRGBA(image.Rect(0, 0, int(float64(src.Bounds().Max.X)*minCoef+0.5), int(float64(src.Bounds().Max.Y)*minCoef+0.5)))
 	draw.CatmullRom.Scale(dst, dst.Rect, src, src.Bounds(), draw.Over, nil)