Feat: Add metadata logo path to SNS aggregator data (#3301)

# Motivation

The logo to the SNS Metadata needs to be hardcoded by the frontend
following a specific pattern.

In this PR, I add the relative path of the logo so that the logic of
where the logo lives lies only in the SNS aggregator canister.

Another reason is because the logo is optional. Therefore, this way it's
easier to know whether the logo is present or not. Otherwise, we would
need to try to fetch the asset and check it.

# Changes

* New field `logo` in `SlowMetadata`.
* Change `SlowMetadata::from` for `from_get_metadata_response` because
it uses a second argument for the logo url.

# Tests

Tests are skipped.

# Todos

- [x] Add entry to changelog (if necessary).

CHANGELOG-Sns_Aggregator.md

@@ -9,6 +9,9 @@ The SNS Aggregator is released through proposals in the Network Nervous System.
 ## Unreleased
 
 ### Wasm changes
+
+* New field `logo` in the `meta` data with the relative path to the logo asset.
+
 ### Operations
 
 ## [Proposal 124250](https://nns.ic0.app/proposal/?u=qoctq-giaaa-aaaaa-aaaea-cai&proposal=124250)

rs/sns_aggregator/src/types/slow.rs

@@ -1,5 +1,5 @@
 //! Slowly changing information about an SNS
-use crate::types::ic_sns_governance::{GetMetadataResponse, ListNervousSystemFunctionsResponse};
+use crate::types::ic_sns_governance::ListNervousSystemFunctionsResponse;
 use crate::types::ic_sns_root::ListSnsCanistersResponse;
 use crate::types::ic_sns_swap::{
     DerivedState, GetDerivedStateResponse, GetInitResponse, GetLifecycleResponse, GetSaleParametersResponse,
@@ -50,7 +50,7 @@ impl From<&UpstreamData> for SlowSnsData {
             index: upstream.index,
             canister_ids: upstream.canister_ids.clone(),
             list_sns_canisters: upstream.list_sns_canisters.clone(),
-            meta: SlowMetadata::from(&upstream.meta),
+            meta: SlowMetadata::from(upstream),
             parameters: upstream.parameters.clone(),
             swap_state: SlowSwapState::from(&upstream.swap_state),
             icrc1_metadata: upstream.icrc1_metadata.clone(),
@@ -77,14 +77,21 @@ pub struct SlowMetadata {
     /// Same as upstream.
     /// Note: The description can also be quite long and isn't needed for the initial view of all the SNSs
     pub description: Option<String>,
+    /// Relative path of the logo if present
+    pub logo: Option<String>,
 }
 
-impl From<&GetMetadataResponse> for SlowMetadata {
-    fn from(upstream: &GetMetadataResponse) -> Self {
+impl From<&UpstreamData> for SlowMetadata {
+    fn from(upstream: &UpstreamData) -> Self {
         SlowMetadata {
-            url: upstream.url.clone(),
-            name: upstream.name.clone(),
-            description: upstream.description.clone(),
+            url: upstream.meta.url.clone(),
+            name: upstream.meta.name.clone(),
+            description: upstream.meta.description.clone(),
+            // Logo URL example: https://3r4gx-wqaaa-aaaaq-aaaia-cai.ic0.app/v1/sns/root/u67kc-jyaaa-aaaaq-aabpq-cai/logo.png
+            logo: match (upstream.meta.logo.clone(), upstream.list_sns_canisters.root) {
+                (Some(_), Some(canister_id)) => Some(format!("/v1/sns/root/{}/logo.png", canister_id.to_text())),
+                _ => None,
+            },
         }
     }
 }