feat: add on-chain sustainability verification for supply-chain products

smart-contract/contracts/src/error.rs

@@ -59,4 +59,20 @@ pub enum Error {
     InvalidThreshold = 66,
     TooManySigners = 67,
     DuplicateSigner = 68,
+
+    // --- Sustainability (70-80) ---
+    /// No sustainability record exists for this product.
+    SustainabilityNotFound = 70,
+    /// Carbon footprint value is negative.
+    InvalidCarbonData = 71,
+    /// Water usage value is negative.
+    InvalidWaterData = 72,
+    /// Renewable energy percentage is out of range (must be 0–100).
+    InvalidRenewableEnergyData = 73,
+    /// Waste-recycled percentage is out of range (must be 0–100).
+    InvalidWasteData = 74,
+    /// Record has already been verified and cannot be updated.
+    SustainabilityAlreadyVerified = 75,
+    /// Operation requires a verified sustainability record.
+    SustainabilityClaimUnverified = 76,
 }

smart-contract/contracts/src/lib.rs

@@ -40,6 +40,8 @@ mod stats;
 mod tracking;
 #[cfg(not(target_arch = "wasm32"))]
 mod upgrade;
+#[cfg(not(target_arch = "wasm32"))]
+mod sustainability;
 
 #[cfg(test)]
 mod load_tests;
@@ -76,3 +78,5 @@ pub use stats::*;
 pub use tracking::*;
 #[cfg(not(target_arch = "wasm32"))]
 pub use upgrade::*;
+#[cfg(not(target_arch = "wasm32"))]
+pub use sustainability::*;

smart-contract/contracts/src/storage.rs

@@ -1,7 +1,7 @@
 use soroban_sdk::{Address, Env, String, Symbol, Vec};
 
 use crate::storage_contract::StorageContract;
-use crate::types::{Product, TrackingEvent};
+use crate::types::{Product, SustainabilityRecord, TrackingEvent};
 
 pub fn get_auth_contract(env: &Env) -> Option<Address> {
     StorageContract::get_auth_contract(env)
@@ -178,3 +178,17 @@ pub fn remove_from_search_index(env: &Env, keyword: String, product_id: &String)
         put_search_index(env, &keyword, &ids);
     }
 }
+
+// ─── Sustainability ──────────────────────────────────────────────────────────
+
+pub fn put_sustainability(env: &Env, product_id: &String, record: &SustainabilityRecord) {
+    StorageContract::put_sustainability(env, product_id, record)
+}
+
+pub fn get_sustainability(env: &Env, product_id: &String) -> Option<SustainabilityRecord> {
+    StorageContract::get_sustainability(env, product_id)
+}
+
+pub fn has_sustainability(env: &Env, product_id: &String) -> bool {
+    StorageContract::has_sustainability(env, product_id)
+}

smart-contract/contracts/src/storage_contract.rs

@@ -1,6 +1,6 @@
 use soroban_sdk::{Address, Env, String, Symbol, Vec};
 
-use crate::types::{DataKey, Product, TrackingEvent};
+use crate::types::{DataKey, Product, SustainabilityRecord, TrackingEvent};
 
 pub struct StorageContract;
 
@@ -279,6 +279,30 @@ impl StorageContract {
             .instance()
             .set(&Self::active_products_key(), &count);
     }
+
+    // ─── Sustainability ──────────────────────────────────────────────────────
+
+    pub fn sustainability_key(product_id: &String) -> DataKey {
+        DataKey::Sustainability(product_id.clone())
+    }
+
+    pub fn put_sustainability(env: &Env, product_id: &String, record: &SustainabilityRecord) {
+        env.storage()
+            .instance()
+            .set(&Self::sustainability_key(product_id), record);
+    }
+
+    pub fn get_sustainability(env: &Env, product_id: &String) -> Option<SustainabilityRecord> {
+        env.storage()
+            .instance()
+            .get(&Self::sustainability_key(product_id))
+    }
+
+    pub fn has_sustainability(env: &Env, product_id: &String) -> bool {
+        env.storage()
+            .instance()
+            .has(&Self::sustainability_key(product_id))
+    }
 }
 
 #[cfg(test)]