Added remote image fetch example

docs/example_plugins/basic.py

@@ -30,7 +30,10 @@ class BasicCommandPlugin(SidebandCommandPlugin):
             lxm.source_hash,
             False,              # Don't use propagation by default, try direct first
             skip_fields = True, # Don't include any additional fields automatically
-            no_display=True     # Dot't display this message in the message stream
+            no_display = True,  # Don't display this message in the message stream
+            attachment = None,  # Don't add any attachment field to this message
+            image = None,       # Don't add any image field to this message
+            audio = None,       # Don't add any audio field to this message
         )
 
 # Finally, tell Sideband what class in this

docs/example_plugins/comic.py

@@ -0,0 +1,70 @@
+import io
+import RNS
+import requests
+from PIL import Image as PilImage
+
+class ComicCommandPlugin(SidebandCommandPlugin):
+    command_name = "comic"
+
+    def start(self):
+        # Do any initialisation work here
+        RNS.log("Comic command plugin example starting...")
+
+        # And finally call start on superclass
+        super().start()
+
+    def stop(self):
+        # Do any teardown work here
+        pass
+
+        # And finally call stop on superclass
+        super().stop()
+
+    def handle_command(self, arguments, lxm):
+        comic_source = "https://imgs.xkcd.com/comics/tsp_vs_tbsp.png"
+        response_content = f"The source for this comic is:\n{comic_source}"
+
+        try:
+            image_request = requests.get(comic_source, stream=True)
+            if image_request.status_code == 200:
+                max_size = 320, 320
+                with PilImage.open(io.BytesIO(image_request.content)) as im:
+                    im.thumbnail(max_size)
+                    buf = io.BytesIO()
+                    im.save(buf, format="webp", quality=22)
+                    image_field = ["webp", buf.getvalue()]
+
+                    # Send the fetched comic as a message
+                    self.get_sideband().send_message(
+                        response_content,
+                        lxm.source_hash,
+                        False,                # Don't use propagation by default, try direct first
+                        skip_fields = True,   # Don't include any additional fields automatically
+                        no_display = True,    # Don't display this message in the message stream
+                        image = image_field,  # Add the scaled and compressed image
+                    )
+
+            else:
+                # Send an error message
+                self.get_sideband().send_message(
+                    "The specified comic could not be downloaded",
+                    lxm.source_hash,
+                    False,                # Don't use propagation by default, try direct first
+                    skip_fields = True,   # Don't include any additional fields automatically
+                    no_display = True,    # Don't display this message in the message stream
+                )
+
+        except Exception as e:
+            # Send an error message
+            self.get_sideband().send_message(
+                "An error occurred while trying to fetch the specified comic:\n\n"+str(e),
+                lxm.source_hash,
+                False,                # Don't use propagation by default, try direct first
+                skip_fields = True,   # Don't include any additional fields automatically
+                no_display = True,    # Don't display this message in the message stream
+            )
+
+
+# Finally, tell Sideband what class in this
+# file is the actual plugin class.
+plugin_class = ComicCommandPlugin