Add the @isApproved RestApiMapping

gsrs-module-substances-core/src/main/java/gsrs/module/substance/approval/ApprovalService.java

@@ -9,6 +9,8 @@
 
 public interface ApprovalService {
 
+    boolean isApprovable(Substance s);
+
     ApprovalResult approve(Substance s) throws ApprovalException;
 
     @Data

gsrs-module-substances-core/src/main/java/gsrs/module/substance/approval/DefaultApprovalService.java

@@ -124,6 +124,26 @@ protected void defaultApprovalValidation(Substance s, String usernameOfApprover)
         }
     }
 
+    /**
+     * Check if the given Substance is approvable by the user invoking this method.
+     * @param s the Substance to approve.
+     * @return a true if the user invoking this method is able to approve given Substance.
+     */
+    @Override
+    public boolean isApprovable(Substance s) {
+        String userName = GsrsSecurityUtils.getCurrentUsername().orElse(null);
+        if (userName == null) {
+            return false;
+        }
+        try {
+            defaultApprovalValidation(s, userName);
+            extraApprovalValidation(s, userName);
+            return true;
+        } catch (ApprovalException ex) {
+            return false;
+        }
+    }
+
     /**
      * Try to approve the given Substance.  The user invoking this method
      * must have Approver Role.

gsrs-module-substances-core/src/main/java/gsrs/module/substance/controllers/SubstanceController.java

@@ -1036,6 +1036,17 @@ public void saveTempStructure(Structure s) {
 
     }
 
+    @GetGsrsRestApiMapping(value={"({id})/@isApprovable", "/{id}/@isApprovable" })
+    public ResponseEntity isApprovableGetMethod(@PathVariable("id") String substanceUUIDOrName, @RequestParam Map<String, String> queryParameters) throws Exception {
+        Optional<Substance> substance = getEntityService().getEntityBySomeIdentifier(substanceUUIDOrName);
+
+        if(!substance.isPresent()){
+            return getGsrsControllerConfiguration().handleNotFound(queryParameters);
+        }
+        boolean approvable = approvalService.isApprovable(substance.get());
+        return new ResponseEntity<>(String.valueOf(approvable), HttpStatus.OK);
+    }
+
     @Transactional
     @GetGsrsRestApiMapping(value={"({id})/@approve", "/{id}/@approve" })
     @hasApproverRole