stub out exif service per issue #72

config/config.go

@@ -23,6 +23,7 @@ type Config struct {
 	Palette     PaletteConfig     `json:"palette,omitempty"`
 	BlurHash    BlurHashConfig    `json:"blurhash,omitempty"`
 	ImageHash   ImageHashConfig   `json:"imagehash,omitempty"`
+	Exif	 ExifConfig `json:"exif,omitempty"`
 	Custom      interface{}       `json:"custom,omitempty"`
 }
 
@@ -48,8 +49,9 @@ type BlurHashConfig struct {
 	Size int `json:"size"`
 }
 
-type ImageHashConfig struct {
-}
+type ImageHashConfig struct {}
+
+type ExifConfig struct {}
 
 type LevelConfig struct {
 	Compliance string `json:"compliance"`

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/koyachi/go-atkinson v0.0.0-20141206131144-dacd7cb9e0c5
 	github.com/muesli/smartcrop v0.3.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
+	github.com/rwcarlsen/goexif v0.0.0-20190401000000-9e8deecbddbd4989a3e8d003684b783412b41e7a
 	github.com/sfomuseum/go-flags v0.0.4
 	github.com/whosonfirst/algnhsa v0.1.0
 	github.com/whosonfirst/go-sanitize v0.1.0

go.sum

@@ -245,6 +245,7 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/rwcarlsen/goexif v0.0.0-20190401000000-9e8deecbddbd4989a3e8d003684b783412b41e7a h1:Vh5bLI9rG6mBx+0dMNUPGAS6Ps/7mSETZniqvHUEznY=
 github.com/rwcarlsen/goexif v0.0.0-20190401000000-9e8deecbddbd4989a3e8d003684b783412b41e7a/go.mod h1:hPqNNc0+uJM6H+SuU8sEs5K5IQeKccPqeSjfgcKGgPk=
 github.com/sfomuseum/go-flags v0.0.4 h1:dCyG9891QspfnSVtZI/ueEJ/LYweHtXPv2yubqUsH+I=
 github.com/sfomuseum/go-flags v0.0.4/go.mod h1:54KCZIGmvZkIOrSCHSNMvgSTKH2gJRJyISH+AiI+55w=

service/exif.go

@@ -0,0 +1,71 @@
+package service
+
+import (
+	"bytes"
+	"context"
+	"github.com/rwcarlsen/goexif/exif"
+	"github.com/rwcarlsen/goexif/mknote"
+	iiifconfig "github.com/go-iiif/go-iiif/config"
+	iiifimage "github.com/go-iiif/go-iiif/image"
+	_ "log"
+)
+
+func init() {
+
+	ctx := context.Background()
+	err := RegisterService(ctx, "exif", initExifService)
+
+	if err != nil {
+		panic(err)
+	}
+}
+
+func initExifService(ctx context.Context, cfg *iiifconfig.Config, im iiifimage.Image) (Service, error) {
+	return NewExifService(cfg.Exif, im)
+}
+
+type ExifService struct {
+	Service          `json:",omitempty"`
+	ExifContext string `json:"@context"`
+	ExifProfile string `json:"profile"`
+	ExifLabel   string `json:"label"`
+	ExifData    *exif.Exif `json:"data"`
+}
+
+func (s *ExifService) Context() string {
+	return s.ExifContext
+}
+
+func (s *ExifService) Profile() string {
+	return s.ExifProfile
+}
+
+func (s *ExifService) Label() string {
+	return s.ExifLabel
+}
+
+func (s *ExifService) Value() interface{} {
+	return s.ExifData
+}
+
+func NewExifService(cfg iiifconfig.ExifConfig, image iiifimage.Image) (Service, error) {
+
+	br := bytes.NewReader(image.Body())
+
+	exif.RegisterParsers(mknote.All...)
+
+	data, err := exif.Decode(br)
+
+	if err != nil {
+		return nil, err
+	}
+
+	s := ExifService{
+		ExifContext: "x-urn:service:go-iiif#exif",
+		ExifProfile: "x-urn:service:go-iiif#exif",
+		ExifLabel:   "x-urn:service:go-iiif#exif",
+		ExifData:     data,
+	}
+
+	return &s, nil
+}