From 1d1df01a68d817a7e8e243339e64fee806b581fe Mon Sep 17 00:00:00 2001
From: Martin Kampas <martin.kampas@ubedi.net>
Date: Fri, 1 Mar 2024 19:55:01 +0100
Subject: [PATCH] Read GPS coordinates from XMP sidecar too

---
 src/backend/model/fileaccess/MetadataLoader.ts   | 16 ++++++++++++++++
 src/common/Utils.ts                              |  8 ++++++++
 src/common/entities/MediaDTO.ts                  |  6 ++++++
 test/backend/assets/sidecar/20240107_110258.json |  6 ++++++
 test/backend/assets/sidecar/20240121_102400.json |  6 ++++++
 test/backend/assets/sidecar/20240128_185808.json |  6 ++++++
 6 files changed, 48 insertions(+)

diff --git a/src/backend/model/fileaccess/MetadataLoader.ts b/src/backend/model/fileaccess/MetadataLoader.ts
index fd7364de..d597b6d4 100644
--- a/src/backend/model/fileaccess/MetadataLoader.ts
+++ b/src/backend/model/fileaccess/MetadataLoader.ts
@@ -666,6 +666,22 @@ export class MetadataLoader {
                       metadata.creationDate;
                   }
                 }
+                if ((sidecarData as SideCar).exif !== undefined) {
+                  if (
+                    (sidecarData as SideCar).exif.GPSLatitude !== undefined &&
+                    (sidecarData as SideCar).exif.GPSLongitude !== undefined
+                  ) {
+                    metadata.positionData = metadata.positionData || {};
+                    metadata.positionData.GPSData = {};
+
+                    metadata.positionData.GPSData.longitude = Utils.xmpExifGpsCoordinateToDecimalDegrees(
+                      (sidecarData as SideCar).exif.GPSLongitude
+                    );
+                    metadata.positionData.GPSData.latitude = Utils.xmpExifGpsCoordinateToDecimalDegrees(
+                      (sidecarData as SideCar).exif.GPSLatitude
+                    );
+                  }
+                }
               }
             }
           }
diff --git a/src/common/Utils.ts b/src/common/Utils.ts
index f707c883..710a43f8 100644
--- a/src/common/Utils.ts
+++ b/src/common/Utils.ts
@@ -381,6 +381,14 @@ export class Utils {
     }
     return ret;
   }
+
+  public static xmpExifGpsCoordinateToDecimalDegrees(text: string): number {
+    const parts = text.match(/^([0-9]+),([0-9.]+)([EWNS])$/);
+    const degrees: number = parseInt(parts[1], 10);
+    const minutes: number = parseFloat(parts[2]);
+    const sign = (parts[3] === "N" || parts[3] === "E") ? 1 : -1;
+    return sign * (degrees + (minutes / 60.0))
+  }
 }
 
 export class LRU<V> {
diff --git a/src/common/entities/MediaDTO.ts b/src/common/entities/MediaDTO.ts
index 84db8157..05acc4ce 100644
--- a/src/common/entities/MediaDTO.ts
+++ b/src/common/entities/MediaDTO.ts
@@ -30,11 +30,17 @@ export interface MediaDimension {
 }
 
 export interface SideCar {
+  exif?: SideCarExif;
   dc?: SideCarDc;
   xmp?: SideCarXmp;
   photoshop?: SideCarPhotoshop;
 }
 
+export interface SideCarExif {
+  GPSLatitude?: string;
+  GPSLongitude?: string;
+}
+
 export interface SideCarDc {
   subject?: string[];
 }
diff --git a/test/backend/assets/sidecar/20240107_110258.json b/test/backend/assets/sidecar/20240107_110258.json
index 6052ac14..a466e4f9 100644
--- a/test/backend/assets/sidecar/20240107_110258.json
+++ b/test/backend/assets/sidecar/20240107_110258.json
@@ -18,5 +18,11 @@
     "Výlet",
     "Travel"
   ],
+  "positionData": {
+    "GPSData": {
+      "latitude": 50.08958748333333,
+      "longitude": 14.397409516666666
+    }
+  },
   "rating": 3
 }
diff --git a/test/backend/assets/sidecar/20240121_102400.json b/test/backend/assets/sidecar/20240121_102400.json
index b3579d2b..551b7d9a 100644
--- a/test/backend/assets/sidecar/20240121_102400.json
+++ b/test/backend/assets/sidecar/20240121_102400.json
@@ -19,5 +19,11 @@
     "Výlet",
     "Travel"
   ],
+  "positionData": {
+    "GPSData": {
+      "latitude": 50.08958748333333,
+      "longitude": 14.397409516666666
+    }
+  },
   "rating": 3
 }
diff --git a/test/backend/assets/sidecar/20240128_185808.json b/test/backend/assets/sidecar/20240128_185808.json
index 7afeb9d9..9d53fca1 100644
--- a/test/backend/assets/sidecar/20240128_185808.json
+++ b/test/backend/assets/sidecar/20240128_185808.json
@@ -19,5 +19,11 @@
     "Výlet",
     "Travel"
   ],
+  "positionData": {
+    "GPSData": {
+      "latitude": 50.08958748333333,
+      "longitude": 14.397409516666666
+    }
+  },
   "rating": 3
 }