From b864191a90a5b16e1f15d08c710813b826ec1de2 Mon Sep 17 00:00:00 2001
From: Jan Niggemann <jn@hz6.de>
Date: Wed, 14 Jun 2023 17:55:08 +0200
Subject: [PATCH] Adds exif capability, closes #2024

---
 files/file.go                            | 77 +++++++++++++++++++-----
 frontend/src/components/prompts/Info.vue | 28 +++++++++
 frontend/src/i18n/de.json                |  2 +
 frontend/src/i18n/en.json                |  2 +
 frontend/src/i18n/fr.json                |  2 +
 go.mod                                   |  1 +
 go.sum                                   |  2 +
 7 files changed, 100 insertions(+), 14 deletions(-)

diff --git a/files/file.go b/files/file.go
index 1daf384b..3e3214dd 100644
--- a/files/file.go
+++ b/files/file.go
@@ -19,6 +19,8 @@ import (
 
 	"github.com/spf13/afero"
 
+	"github.com/rwcarlsen/goexif/exif"
+
 	"github.com/filebrowser/filebrowser/v2/errors"
 	"github.com/filebrowser/filebrowser/v2/rules"
 )
@@ -26,20 +28,22 @@ import (
 // FileInfo describes a file.
 type FileInfo struct {
 	*Listing
-	Fs        afero.Fs          `json:"-"`
-	Path      string            `json:"path"`
-	Name      string            `json:"name"`
-	Size      int64             `json:"size"`
-	Extension string            `json:"extension"`
-	ModTime   time.Time         `json:"modified"`
-	Mode      os.FileMode       `json:"mode"`
-	IsDir     bool              `json:"isDir"`
-	IsSymlink bool              `json:"isSymlink"`
-	Type      string            `json:"type"`
-	Subtitles []string          `json:"subtitles,omitempty"`
-	Content   string            `json:"content,omitempty"`
-	Checksums map[string]string `json:"checksums,omitempty"`
-	Token     string            `json:"token,omitempty"`
+	Fs         afero.Fs          `json:"-"`
+	Path       string            `json:"path"`
+	Name       string            `json:"name"`
+	Size       int64             `json:"size"`
+	Extension  string            `json:"extension"`
+	ModTime    time.Time         `json:"modified"`
+	Mode       os.FileMode       `json:"mode"`
+	IsDir      bool              `json:"isDir"`
+	IsSymlink  bool              `json:"isSymlink"`
+	Type       string            `json:"type"`
+	ExifCam    string            `json:"exifcam,omitempty"`
+	ExifDate   string            `json:"exifdate,omitempty"`
+	Subtitles  []string          `json:"subtitles,omitempty"`
+	Content    string            `json:"content,omitempty"`
+	Checksums  map[string]string `json:"checksums,omitempty"`
+	Token      string            `json:"token,omitempty"`
 }
 
 // FileOptions are the options when getting a file info.
@@ -232,6 +236,7 @@ func (i *FileInfo) detectType(modify, saveContent, readHeader bool) error {
 		return nil
 	case strings.HasPrefix(mimetype, "image"):
 		i.Type = "image"
+		i.decodeExif()
 		return nil
 	case strings.HasSuffix(mimetype, "pdf"):
 		i.Type = "pdf"
@@ -302,6 +307,50 @@ func (i *FileInfo) detectSubtitles() {
 	}
 }
 
+func (i *FileInfo) decodeExif() error {
+        if i.Type != "image" {
+                return nil
+        }
+
+	f, err := i.Fs.Open(i.Path)
+	if err != nil {
+		return err
+	}
+
+	x, err := exif.Decode(f)
+        if err != nil {
+                return err
+        }
+
+	camModel, err := x.Get(exif.Model)
+        if err != nil {
+                return err
+        }
+
+	MycamModel, err := camModel.StringVal()
+        if err != nil {
+                return err
+        }
+
+        camMake, err := x.Get(exif.Make)
+        if err != nil {
+                return err
+        }
+
+        MycamMake, err := camMake.StringVal()
+        if err != nil {
+                return err
+        }
+
+	i.ExifCam = MycamMake + " " + MycamModel
+
+	// Two convenience functions exist for date/time taken and GPS coords:
+	tm, _ := x.DateTime()
+	i.ExifDate = tm.String()
+
+	return nil
+}
+
 func (i *FileInfo) readListing(checker rules.Checker, readHeader bool) error {
 	afs := &afero.Afero{Fs: i.Fs}
 	dir, err := afs.ReadDir(i.Path)
diff --git a/frontend/src/components/prompts/Info.vue b/frontend/src/components/prompts/Info.vue
index 5312ac76..422baade 100644
--- a/frontend/src/components/prompts/Info.vue
+++ b/frontend/src/components/prompts/Info.vue
@@ -19,6 +19,24 @@
       <p v-if="selected.length < 2" :title="modTime">
         <strong>{{ $t("prompts.lastModified") }}:</strong> {{ humanTime }}
       </p>
+      <p
+        v-if="
+          selected.length < 2 &&
+          (this.req.type === 'image' ||
+            this.req.items[this.selected[0]].type === 'image')
+        "
+      >
+        <strong>{{ $t("prompts.exifcam") }}:</strong> {{ exifcam }}
+      </p>
+      <p
+        v-if="
+          selected.length < 2 &&
+          (this.req.type === 'image' ||
+            this.req.items[this.selected[0]].type === 'image')
+        "
+      >
+        <strong>{{ $t("prompts.exifdate") }}:</strong> {{ exifdate }}
+      </p>
 
       <template v-if="dir && selected.length === 0">
         <p>
@@ -113,6 +131,16 @@ export default {
     modTime: function () {
       return new Date(Date.parse(this.req.modified)).toLocaleString();
     },
+    exifcam: function () {
+      return this.selectedCount === 0
+        ? this.req.exifcam
+        : this.req.items[this.selected[0]].exifcam;
+    },
+    exifdate: function () {
+      return this.selectedCount === 0
+        ? this.req.exifdate
+        : this.req.items[this.selected[0]].exifdate;
+    },
     name: function () {
       return this.selectedCount === 0
         ? this.req.name
diff --git a/frontend/src/i18n/de.json b/frontend/src/i18n/de.json
index ad8aadc4..58a19549 100644
--- a/frontend/src/i18n/de.json
+++ b/frontend/src/i18n/de.json
@@ -132,6 +132,8 @@
     "download": "Lade Dateien",
     "downloadMessage": "Wählen Sie ein Format zum Herunterladen aus.",
     "error": "Etwas ist schief gelaufen",
+    "exifcam": "Kamera (Exif)",
+    "exifdate": "Datum (Exif)",
     "fileInfo": "Dateiinformation",
     "filesSelected": "{count} Dateien ausgewählt.",
     "lastModified": "Zuletzt geändert",
diff --git a/frontend/src/i18n/en.json b/frontend/src/i18n/en.json
index a8071114..5fec38a6 100644
--- a/frontend/src/i18n/en.json
+++ b/frontend/src/i18n/en.json
@@ -133,6 +133,8 @@
     "download": "Download files",
     "downloadMessage": "Choose the format you want to download.",
     "error": "Something went wrong",
+    "exifcam": "Camera (Exif)",
+    "exifdate": "Date taken (Exif)",
     "fileInfo": "File information",
     "filesSelected": "{count} files selected.",
     "lastModified": "Last Modified",
diff --git a/frontend/src/i18n/fr.json b/frontend/src/i18n/fr.json
index 0be93f1a..17a8fa5f 100644
--- a/frontend/src/i18n/fr.json
+++ b/frontend/src/i18n/fr.json
@@ -132,6 +132,8 @@
     "download": "Télécharger",
     "downloadMessage": "Choisissez le format de téléchargement :",
     "error": "Quelque chose s'est mal passé",
+    "exifcam": "Caméra (Exif)",
+    "exifdate": "Date (Exif)",
     "fileInfo": "Informations",
     "filesSelected": "{count} éléments sélectionnés",
     "lastModified": "Dernière modification",
diff --git a/go.mod b/go.mod
index b50ba09c..e4aaf937 100644
--- a/go.mod
+++ b/go.mod
@@ -51,6 +51,7 @@ require (
 	github.com/pierrec/lz4/v4 v4.1.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd // indirect
 	github.com/spf13/cast v1.5.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/subosito/gotenv v1.4.2 // indirect
diff --git a/go.sum b/go.sum
index 3b5fde8a..7632d16d 100644
--- a/go.sum
+++ b/go.sum
@@ -217,6 +217,8 @@ github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd h1:CmH9+J6ZSsIjUK3dcGsnCnO41eRBOnY12zwkn5qVwgc=
+github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd/go.mod h1:hPqNNc0+uJM6H+SuU8sEs5K5IQeKccPqeSjfgcKGgPk=
 github.com/shirou/gopsutil/v3 v3.23.1 h1:a9KKO+kGLKEvcPIs4W62v0nu3sciVDOOOPUD0Hz7z/4=
 github.com/shirou/gopsutil/v3 v3.23.1/go.mod h1:NN6mnm5/0k8jw4cBfCnJtr5L7ErOTg18tMNpgFkn0hA=
 github.com/spf13/afero v1.9.3 h1:41FoI0fD7OR7mGcKE/aOiLkGreyf8ifIOQmJANWogMk=