Serve svg tpl when thumbnail not found

app.py

@@ -3,6 +3,7 @@
 # abelliqueux <contact@arthus.net>
 from flask import Flask, flash, request, redirect, url_for, send_file
 from flask_httpauth import HTTPBasicAuth
+from io import BytesIO
 import gettext
 import os
 import subprocess
@@ -167,7 +168,7 @@ def list_media_files(folder):
 def generate_thumbnails():
     media_files = list_media_files(upload_folder)
     for media in media_files:
-        subprocess.call(['ffmpeg', '-i', upload_folder + "/" + media, '-q:v',  '30', '-s' , '160x120' , '-vf' , 'boxblur=2' , '-ss', '00:00:01.000', '-vframes', '1', thumbnails_folder + "/" + media + ".jpg", "-y"])
+        subprocess.call(['ffmpeg', '-i', upload_folder + "/" + media, '-q:v', '30', '-s', '160x120', '-vf', 'boxblur=2', '-ss', '00:00:01.000', '-vframes', '1', thumbnails_folder + "/" + media + ".jpg", "-y"])
 
 
 @app.route("/")
@@ -235,14 +236,20 @@ def upload_file(over_write=1):
     return "OK"
 
 
-
 @app.route("/thumb/<media>")
 @auth.login_required
 def get_thumbnail(media):
-    if media and os.path.exists(thumbnails_folder + os.sep + media):
-        return send_file(thumbnails_folder + os.sep +  media + ".jpg", mimetype='image/jpg')
-    
-    
+    if media:
+        media_full_path = thumbnails_folder + os.sep + media + ".jpg"
+        if os.path.exists(media_full_path):
+            return send_file(media_full_path, mimetype='image/jpg')
+        else:
+            # Return a svg file as bytes, so that we can use gettext on its content
+            svg = '<svg width="320" height="240" viewBox="0 0 84.6 63.5" version="1.1" id="not_found" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg"><path id="not_found_x" style="fill:#f00;" d="M 3.076298,0.04960937 H 0.04960937 V 1.5394409 L 40.0389,31.278194 0.04960937,61.017464 v 2.432927 H 1.8076416 L 42.553475,33.148364 83.299825,63.450391 h 1.317232 V 60.691386 L 45.067533,31.278194 84.617057,1.8655192 V 0.04960937 H 82.031169 L 42.553475,29.408541 Z" /><text xml:space="preserve" style="font-size:8px;stroke:#000;stroke-width:2px;" x="50%" y="50%" id="not_found_txt"><tspan id="not_found_span" style="text-align:center;text-anchor:middle;stroke:none;">{}</tspan></text></svg>'.format(_("MEDIA NOT FOUND"))
+            buf = BytesIO(bytes(svg, "UTF-8"))
+            return send_file(buf, mimetype="image/svg+xml")
+
+
 if __name__ == '__main__':
     generate_thumbnails()
     # Turn ACT and POW leds off on start

locales/en/LC_MESSAGES/template.pot

@@ -5,7 +5,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2022-11-03 12:59+0100\n"
+"POT-Creation-Date: 2022-11-25 14:13+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -15,35 +15,39 @@ msgstr ""
 "Generated-By: pygettext.py 1.5\n"
 
 
-#: ../app.py:25
+#: ../app.py:29
 msgid "Found configuration file in {}"
 msgstr ""
 
-#: ../app.py:104
+#: ../app.py:178
 msgid "Nothing to see here !"
 msgstr ""
 
-#: ../app.py:115
+#: ../app.py:192
 msgid "Blinkin"
 msgstr ""
 
-#: ../app.py:122
+#: ../app.py:200
 msgid "Rebooting..."
 msgstr ""
 
-#: ../app.py:129
+#: ../app.py:208
 msgid "Shutting down..."
 msgstr ""
 
-#: ../app.py:139
+#: ../app.py:221
 msgid "No file part: {}"
 msgstr ""
 
-#: ../app.py:144
+#: ../app.py:226
 msgid "No selected file"
 msgstr ""
 
-#: ../app.py:148
+#: ../app.py:233
 msgid "File saved in {}"
 msgstr ""
 
+#: ../app.py:250
+msgid "MEDIA NOT FOUND"
+msgstr ""
+

locales/fr/LC_MESSAGES/template.pot

@@ -47,3 +47,6 @@ msgstr "Aucun fichier sélectionné."
 msgid "File saved in {}"
 msgstr "Fichier enregistré dans {}"
 
+#: ../app.py:250
+msgid "MEDIA NOT FOUND"
+msgstr "MEDIA INTROUVABLE"

locales/gen_mo.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-# pygettext ../../../app.py -o template.pot
+cd "$(dirname "$0")"
+#pygettext -p en/LC_MESSAGES/ -o template.pot ../app.py
 for locale in */LC_MESSAGES/template.pot; do
 	/usr/bin/msgfmt -o ${locale%.*}.mo  $locale
 done