Finalized B2 Storage backend.

Finalized the work needed on the backup script for B2 Storage, and fixed
a couple issues with the UI.

management/backup.py

@@ -474,12 +474,13 @@ def list_target_files(config):
 
 		return [(key.name[len(path):], key.size) for key in bucket.list(prefix=path)]
 	elif target.scheme == "b2":
-		(auth_token, api_url) = b2_perform_authentication(target.username, target.password)
+		api = b2_perform_authentication(target.username, target.password)
 		if api == None:
 			raise ValueError("B2 authentication failed for unknown reason.")
-		
+		(auth_token, api_url) = api
+
 		bucket_id = b2_get_bucket_id(target.username, api_url, auth_token, target.hostname)
-		
+		return b2_list_files(target.username, api_url, auth_token, bucket_id, target.path)
 	else:
 		raise ValueError(config["target"])
 
@@ -492,7 +493,7 @@ def b2_perform_authentication(acc_id, app_key):
 	import json
 
 	# Formulate the authtoken according to B2 Storage API Spec
-	auth_token = base64.b64encode((acc_id + ":" + app_key).encode('utf-8'))
+	auth_token = "Basic" + base64.b64encode((acc_id + ":" + app_key).encode('utf-8')).decode('utf-8')
 	headers = {'Authorization': auth_token}
 
 	req = Request("https://api.backblazeb2.com/b2api/v1/b2_authorize_account", headers=headers)
@@ -502,6 +503,7 @@ def b2_perform_authentication(acc_id, app_key):
 			return (data['authorizationToken'], data['apiUrl'])
 	except HTTPError as e:
 		e_data = json.loads(e.read().decode('utf-8'))
+		print(e_data)
 		if e_data['code'] == 'unauthorized':
 			raise ValueError("Invalid key pair, or B2 has not been enabled, or the user is suspended.")
 		elif e_data['code'] == 'missing_phone_number':
@@ -523,14 +525,9 @@ def b2_perform_request(acc_id, api_url, auth_token, method, data):
 		req_data = None
 
 	req = Request("{0}/b2api/v1/{1}".format(api_url, method), data=req_data, headers = { 'Authorization': auth_token})
-	try:
-		with urlopen(req) as res:
-			data = json.loads(res.read().decode('utf-8'))
-			return data
-	except HTTPError as e:
-		raise e
-	except:
-		raise ValueError("B2 Storage: Unknown error occured")
+	with urlopen(req) as res:
+		data = json.loads(res.read().decode('utf-8'))
+		return data
 
 def b2_get_bucket_id(acc_id, api_url, auth_token, bucket_name):
 	from urllib.error import HTTPError
@@ -545,6 +542,23 @@ def b2_get_bucket_id(acc_id, api_url, auth_token, bucket_name):
 		if e_data['code'] == 'bad_request':
 			raise ValueError("B2 Storage: Account ID does not exist")
 
+def b2_list_files(acc_id, api_url, auth_token, bucket_id, path):
+	from urllib.error import HTTPError
+	if len(path) > 1:
+		path = path[1:] if path[0] == '/' else path
+	else:
+		path = ''
+
+	try:
+		file_list = b2_perform_request(acc_id, api_url, auth_token, 'b2_list_file_names', {
+			'bucketId': bucket_id,
+			'prefix': path
+		})['files']
+		file_list = [x for x in file_list if x['action'] == 'upload']
+		return [(key['fileName'][len(path) + 1:], key['size']) for key in file_list]
+	except HTTPError as e:
+		raise ValueError("B2 Storage: Could not list files")
+
 def backup_set_custom(env, target, target_user, target_pass, min_age):
 	config = get_backup_config(env, for_save=True)
 

management/templates/system-backup.html

@@ -121,13 +121,13 @@
   <div class="form-group backup-target-b2">
     <label for="backup-target-user" class="col-sm-2 control-label">B2 Account Id</label>
     <div class="col-sm-8">
-      <input type="text" class="form-control" rows="1" id="backup-target-user">
+      <input type="text" class="form-control" rows="1" id="backup-target-b2-user">
     </div>
   </div>
   <div class="form-group backup-target-b2">
     <label for="backup-target-pass" class="col-sm-2 control-label">B2 Application Key</label>
     <div class="col-sm-8">
-      <input type="text" class="form-control" rows="1" id="backup-target-pass">
+      <input type="text" class="form-control" rows="1" id="backup-target-b2-pass">
     </div>
   </div>
   <!-- Common -->
@@ -163,7 +163,7 @@
 
 function toggle_form() {
   var target_type = $("#backup-target-type").val();
-  $(".backup-target-local, .backup-target-rsync, .backup-target-s3").hide();
+  $(".backup-target-local, .backup-target-rsync, .backup-target-s3, .backup-target-b2").hide();
   $(".backup-target-" + target_type).show();
 }
 
@@ -264,7 +264,9 @@ function show_custom_backup() {
         } else if (r.target.substring(0, 5) == "b2://") {
           $("#backup-target-type").val("b2");
           var hostpath = r.target.substring(5).split('@');
-          var host = hostpath.shift();
+          var usernamepass = hostpath.shift().split(":");
+          $("#backup-target-rsync-b2-user").val(usernamepass[0]);
+          $("#backup-target-rsync-b2-user").val(usernamepass[1]);
           $("#backup-target-b2-path").val(hostpath.join('/'));
         }
         toggle_form()
@@ -283,7 +285,7 @@ function set_custom_backup() {
     target = "s3://" + $("#backup-target-s3-host").val() + "/" + $("#backup-target-s3-path").val();
   else if (target_type == "b2")
     target = "b2://" + $("#backup-target-b2-user").val() + ":" 
-      + $("#backup-target-b2-pass").val() + "@" + $("#backup-target-b2-path");
+      + $("#backup-target-b2-pass").val() + "@" + $("#backup-target-b2-path").val();
   else if (target_type == "rsync") {
     target = "rsync://" + $("#backup-target-rsync-user").val() + "@" + $("#backup-target-rsync-host").val()
                                                                 + "/" + $("#backup-target-rsync-path").val();