BaseContext: expose md5 function in context (dbt-labs#6247)

* BaseContext: expose md5 function in context

* BaseContext: add return value type

* Add changie entry

* rename "md5" to "local_md5"

* fix test_context.py

.changes/unreleased/Features-20221114-185207.yaml

@@ -0,0 +1,7 @@
+kind: Features
+body: Added an md5 function to the base context
+time: 2022-11-14T18:52:07.788593+02:00
+custom:
+  Author: haritamar
+  Issue: "6246"
+  PR: "6247"

core/dbt/context/base.py

@@ -4,6 +4,7 @@
 
 from dbt import flags
 from dbt import tracking
+from dbt import utils
 from dbt.clients.jinja import get_rendered
 from dbt.clients.yaml_helper import yaml, safe_load, SafeLoader, Loader, Dumper  # noqa: F401
 from dbt.constants import SECRET_ENV_PREFIX, DEFAULT_ENV_PLACEHOLDER
@@ -687,6 +688,19 @@ def diff_of_two_dicts(
                 dict_diff.update({k: dict_a[k]})
         return dict_diff
 
+    @contextmember
+    @staticmethod
+    def local_md5(value: str) -> str:
+        """Calculates an MD5 hash of the given string.
+        It's called "local_md5" to emphasize that it runs locally in dbt (in jinja context) and not an MD5 SQL command.
+
+        :param value: The value to hash
+
+        Usage:
+            {% set value_hash = local_md5("hello world") %}
+        """
+        return utils.md5(value)
+
 
 def generate_base_context(cli_vars: Dict[str, Any]) -> Dict[str, Any]:
     ctx = BaseContext(cli_vars)

test/unit/test_context.py

@@ -201,6 +201,7 @@ def assert_has_keys(required_keys: Set[str], maybe_keys: Set[str], ctx: Dict[str
         "flags",
         "print",
         "diff_of_two_dicts",
+        "local_md5"
     }
 )