download attribute in project schema

schema/project.json

@@ -79,6 +79,17 @@
         "Tools"
       ],
       "type": "string"
+    },
+    "downloads": {
+      "description": "Optional list of download URLs.",
+      "type": "array",
+      "items": {
+        "type": "string",
+        "format": "uri"
+      },
+      "minItems": 1,
+      "uniqueItems": true,
+      "optional": true
     }
   },
   "required": [

schema/tests/data/project/negative/downloads-empty.yaml

@@ -0,0 +1,12 @@
+name: "Test Project"
+level: 3
+leaders:
+  - github: "testuser1"
+  - github: "testuser2"
+downloads: []
+pitch: A very brief, one-line description of your project
+tags:
+  - example-tag-1
+  - example-tag-2
+  - example-tag-3
+type: code

schema/tests/data/project/negative/downloads-non-unique.yaml

@@ -0,0 +1,14 @@
+name: "Test Project"
+level: 3
+leaders:
+  - github: "testuser1"
+  - github: "testuser2"
+downloads:
+  - https://abc.com/download
+  - https://abc.com/download
+pitch: A very brief, one-line description of your project
+tags:
+  - example-tag-1
+  - example-tag-2
+  - example-tag-3
+type: code

schema/tests/data/project/negative/downloads-non-uri.yaml

@@ -0,0 +1,14 @@
+name: "Test Project"
+level: 3
+leaders:
+  - github: "testuser1"
+  - github: "testuser2"
+downloads:
+  - example-url-1
+  - example-url-2
+pitch: A very brief, one-line description of your project
+tags:
+  - example-tag-1
+  - example-tag-2
+  - example-tag-3
+type: code

schema/tests/project_test.py

@@ -26,6 +26,15 @@ def test_positive(project_schema):
         ("level-invalid.yaml", "2.5 is not one of [2, 3, 3.5, 4]"),
         ("name-empty.yaml", "'' is too short"),
         ("name-none.yaml", "None is not of type 'string'"),
+        ("downloads-empty.yaml", "[] should be non-empty"),
+        (
+            "downloads-non-unique.yaml",
+            "['https://abc.com/download', 'https://abc.com/download'] has non-unique elements",
+        ),
+        (
+            "downloads-non-uri.yaml",
+            "['example-url-1', 'example-url-2'] has non-uri elements",
+        ),
     ],
 )
 def test_negative(project_schema, file_path, error_message):

schema/utils/validators.py

@@ -1,8 +1,32 @@
+import re
+from urllib.parse import urlparse
+
 from jsonschema import validate
 from jsonschema.exceptions import ValidationError
 
 
+def is_valid_url(url):
+    parsed_url = urlparse(url)
+
+    # A valid URL must have a scheme (http or https) and a netloc (domain)
+    if not parsed_url.scheme or not parsed_url.netloc:
+        return False
+
+    # valid domain format check
+    domain_regex = r"^(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9-]{2,}$"
+    if not re.match(domain_regex, parsed_url.netloc):
+        return False
+
+    return True
+
+
 def validate_data(schema, data):
+    # Perform URL validation before schema validation
+    if "downloads" in data:
+        invalid_urls = [url for url in data["downloads"] if not is_valid_url(url)]
+        if invalid_urls:
+            return f"{invalid_urls} has non-uri elements"
+
     try:
         validate(schema=schema, instance=data)
     except ValidationError as e: