Localize notification_utils to the API

This changeset pulls in all of the notification_utils code directly into the API and removes it as an external dependency.  We are doing this to cut down on operational maintenance of the project and will begin removing parts of it no longer needed for the API.

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

notifications_utils/s3.py

@@ -0,0 +1,87 @@
+import os
+import urllib
+
+import botocore
+from boto3 import Session
+from botocore.config import Config
+from flask import current_app
+
+AWS_CLIENT_CONFIG = Config(
+    # This config is required to enable S3 to connect to FIPS-enabled
+    # endpoints.  See https://aws.amazon.com/compliance/fips/ for more
+    # information.
+    s3={
+        "addressing_style": "virtual",
+    },
+    use_fips_endpoint=True,
+)
+
+default_access_key_id = os.environ.get("AWS_ACCESS_KEY_ID")
+default_secret_access_key = os.environ.get("AWS_SECRET_ACCESS_KEY")
+default_region = os.environ.get("AWS_REGION")
+
+
+def s3upload(
+    filedata,
+    region,
+    bucket_name,
+    file_location,
+    content_type="binary/octet-stream",
+    tags=None,
+    metadata=None,
+    access_key=default_access_key_id,
+    secret_key=default_secret_access_key,
+):
+    session = Session(
+        aws_access_key_id=access_key,
+        aws_secret_access_key=secret_key,
+        region_name=region,
+    )
+    _s3 = session.resource("s3", config=AWS_CLIENT_CONFIG)
+
+    key = _s3.Object(bucket_name, file_location)
+
+    put_args = {
+        "Body": filedata,
+        "ServerSideEncryption": "AES256",
+        "ContentType": content_type,
+    }
+
+    if tags:
+        tags = urllib.parse.urlencode(tags)
+        put_args["Tagging"] = tags
+
+    if metadata:
+        metadata = put_args["Metadata"] = metadata
+
+    try:
+        key.put(**put_args)
+    except botocore.exceptions.ClientError as e:
+        current_app.logger.error(
+            "Unable to upload file to S3 bucket {}".format(bucket_name)
+        )
+        raise e
+
+
+class S3ObjectNotFound(botocore.exceptions.ClientError):
+    pass
+
+
+def s3download(
+    bucket_name,
+    filename,
+    region=default_region,
+    access_key=default_access_key_id,
+    secret_key=default_secret_access_key,
+):
+    try:
+        session = Session(
+            aws_access_key_id=access_key,
+            aws_secret_access_key=secret_key,
+            region_name=region,
+        )
+        s3 = session.resource("s3", config=AWS_CLIENT_CONFIG)
+        key = s3.Object(bucket_name, filename)
+        return key.get()["Body"]
+    except botocore.exceptions.ClientError as error:
+        raise S3ObjectNotFound(error.response, error.operation_name)