feat(api): validate a repositories existance

api/Dockerfile

@@ -22,6 +22,9 @@ ENV HOME=/home/outdated
 
 ENV PYTHONUNBUFFERED=1
 ENV DJANGO_SETTINGS_MODULE outdated.settings
+
+# prevent git from asking for credentials on wrong urls
+ENV GIT_ASKPASS true
 ENV APP_HOME=/app
 
 COPY pyproject.toml poetry.lock $APP_HOME/

api/outdated/models.py

@@ -1,5 +1,7 @@
+from subprocess import run
 from uuid import uuid4
 
+from django.core.exceptions import ValidationError
 from django.core.validators import RegexValidator
 from django.db import models
 
@@ -56,11 +58,19 @@ def pre_save(self, model_instance, add):
         return super().pre_save(model_instance, add)
 
 
+def validate_repo_exists(value: str):
+    """Validate the existance of a remote git repository."""
+    result = run(["git", "ls-remote", value], capture_output=True)
+    if result.returncode != 0:
+        raise ValidationError("Repository does not exist.", params={"value": value})
+
+
 class RepositoryURLField(models.CharField):
     default_validators = [
         RegexValidator(
             regex=r"^([-_\w]+\.[-._\w]+)\/([-_\w]+)\/([-_\w]+)$",
             message="Invalid repository url",
-        )
+        ),
+        validate_repo_exists,
     ]
     description = "Field for git repository URLs."

api/outdated/outdated/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.5 on 2023-10-04 13:07
+# Generated by Django 4.2.5 on 2023-10-04 13:11
 
 from django.db import migrations, models
 import django.db.models.deletion